drivers/scsi/scsi_transport_iscsi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * iSCSI transport class definitions
   4  *
   5  * Copyright (C) IBM Corporation, 2004
   6  * Copyright (C) Mike Christie, 2004 - 2005
   7  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   8  * Copyright (C) Alex Aizman, 2004 - 2005
   9  */
  10 #include <linux/module.h>
  11 #include <linux/mutex.h>
  12 #include <linux/slab.h>
  13 #include <linux/bsg-lib.h>
  14 #include <linux/idr.h>
  15 #include <net/tcp.h>
  16 #include <scsi/scsi.h>
  17 #include <scsi/scsi_host.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_transport.h>
  20 #include <scsi/scsi_transport_iscsi.h>
  21 #include <scsi/iscsi_if.h>
  22 #include <scsi/scsi_cmnd.h>
  23 #include <scsi/scsi_bsg_iscsi.h>
  24
  25 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  26
  27 #define ISCSI_SEND_MAX_ALLOWED  10
  28
  29 #define CREATE_TRACE_POINTS
  30 #include <trace/events/iscsi.h>
  31
  32 /*
  33  * Export tracepoint symbols to be used by other modules.
  34  */
  35 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
  36 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
  37 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
  38 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
  39 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
  40
  41 static int dbg_session;
  42 module_param_named(debug_session, dbg_session, int,
  43                    S_IRUGO | S_IWUSR);
  44 MODULE_PARM_DESC(debug_session,
  45                  "Turn on debugging for sessions in scsi_transport_iscsi "
  46                  "module. Set to 1 to turn on, and zero to turn off. Default "
  47                  "is off.");
  48
  49 static int dbg_conn;
  50 module_param_named(debug_conn, dbg_conn, int,
  51                    S_IRUGO | S_IWUSR);
  52 MODULE_PARM_DESC(debug_conn,
  53                  "Turn on debugging for connections in scsi_transport_iscsi "
  54                  "module. Set to 1 to turn on, and zero to turn off. Default "
  55                  "is off.");
  56
  57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  58         do {                                                            \
  59                 if (dbg_session)                                        \
  60                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  61                                                  "%s: " dbg_fmt,        \
  62                                                  __func__, ##arg);      \
  63                 iscsi_dbg_trace(trace_iscsi_dbg_trans_session,          \
  64                                 &(_session)->dev,                       \
  65                                 "%s " dbg_fmt, __func__, ##arg);        \
  66         } while (0);
  67
  68 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  69         do {                                                            \
  70                 if (dbg_conn)                                           \
  71                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  72                                               "%s: " dbg_fmt,           \
  73                                               __func__, ##arg);         \
  74                 iscsi_dbg_trace(trace_iscsi_dbg_trans_conn,             \
  75                                 &(_conn)->dev,                          \
  76                                 "%s " dbg_fmt, __func__, ##arg);        \
  77         } while (0);
  78
  79 struct iscsi_internal {
  80         struct scsi_transport_template t;
  81         struct iscsi_transport *iscsi_transport;
  82         struct list_head list;
  83         struct device dev;
  84
  85         struct transport_container conn_cont;
  86         struct transport_container session_cont;
  87 };
  88
  89 static DEFINE_IDR(iscsi_ep_idr);
  90 static DEFINE_MUTEX(iscsi_ep_idr_mutex);
  91
  92 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  93
  94 static struct workqueue_struct *iscsi_conn_cleanup_workq;
  95
  96 static DEFINE_IDA(iscsi_sess_ida);
  97 /*
  98  * list of registered transports and lock that must
  99  * be held while accessing list. The iscsi_transport_lock must
 100  * be acquired after the rx_queue_mutex.
 101  */
 102 static LIST_HEAD(iscsi_transports);
 103 static DEFINE_SPINLOCK(iscsi_transport_lock);
 104
 105 #define to_iscsi_internal(tmpl) \
 106         container_of(tmpl, struct iscsi_internal, t)
 107
 108 #define dev_to_iscsi_internal(_dev) \
 109         container_of(_dev, struct iscsi_internal, dev)
 110
 111 static void iscsi_transport_release(struct device *dev)
 112 {
 113         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 114         kfree(priv);
 115 }
 116
 117 /*
 118  * iscsi_transport_class represents the iscsi_transports that are
 119  * registered.
 120  */
 121 static struct class iscsi_transport_class = {
 122         .name = "iscsi_transport",
 123         .dev_release = iscsi_transport_release,
 124 };
 125
 126 static ssize_t
 127 show_transport_handle(struct device *dev, struct device_attribute *attr,
 128                       char *buf)
 129 {
 130         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 131
 132         if (!capable(CAP_SYS_ADMIN))
 133                 return -EACCES;
 134         return sysfs_emit(buf, "%llu\n",
 135                   (unsigned long long)iscsi_handle(priv->iscsi_transport));
 136 }
 137 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 138
 139 #define show_transport_attr(name, format)                               \
 140 static ssize_t                                                          \
 141 show_transport_##name(struct device *dev,                               \
 142                       struct device_attribute *attr,char *buf)          \
 143 {                                                                       \
 144         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 145         return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
 146 }                                                                       \
 147 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 148
 149 show_transport_attr(caps, "0x%x");
 150
 151 static struct attribute *iscsi_transport_attrs[] = {
 152         &dev_attr_handle.attr,
 153         &dev_attr_caps.attr,
 154         NULL,
 155 };
 156
 157 static struct attribute_group iscsi_transport_group = {
 158         .attrs = iscsi_transport_attrs,
 159 };
 160
 161 /*
 162  * iSCSI endpoint attrs
 163  */
 164 #define iscsi_dev_to_endpoint(_dev) \
 165         container_of(_dev, struct iscsi_endpoint, dev)
 166
 167 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 168 struct device_attribute dev_attr_##_prefix##_##_name =  \
 169         __ATTR(_name,_mode,_show,_store)
 170
 171 static void iscsi_endpoint_release(struct device *dev)
 172 {
 173         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 174
 175         mutex_lock(&iscsi_ep_idr_mutex);
 176         idr_remove(&iscsi_ep_idr, ep->id);
 177         mutex_unlock(&iscsi_ep_idr_mutex);
 178
 179         kfree(ep);
 180 }
 181
 182 static struct class iscsi_endpoint_class = {
 183         .name = "iscsi_endpoint",
 184         .dev_release = iscsi_endpoint_release,
 185 };
 186
 187 static ssize_t
 188 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 189 {
 190         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 191         return sysfs_emit(buf, "%d\n", ep->id);
 192 }
 193 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 194
 195 static struct attribute *iscsi_endpoint_attrs[] = {
 196         &dev_attr_ep_handle.attr,
 197         NULL,
 198 };
 199
 200 static struct attribute_group iscsi_endpoint_group = {
 201         .attrs = iscsi_endpoint_attrs,
 202 };
 203
 204 struct iscsi_endpoint *
 205 iscsi_create_endpoint(int dd_size)
 206 {
 207         struct iscsi_endpoint *ep;
 208         int err, id;
 209
 210         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 211         if (!ep)
 212                 return NULL;
 213
 214         mutex_lock(&iscsi_ep_idr_mutex);
 215
 216         /*
 217          * First endpoint id should be 1 to comply with user space
 218          * applications (iscsid).
 219          */
 220         id = idr_alloc(&iscsi_ep_idr, ep, 1, -1, GFP_NOIO);
 221         if (id < 0) {
 222                 mutex_unlock(&iscsi_ep_idr_mutex);
 223                 printk(KERN_ERR "Could not allocate endpoint ID. Error %d.\n",
 224                        id);
 225                 goto free_ep;
 226         }
 227         mutex_unlock(&iscsi_ep_idr_mutex);
 228
 229         ep->id = id;
 230         ep->dev.class = &iscsi_endpoint_class;
 231         dev_set_name(&ep->dev, "ep-%d", id);
 232         err = device_register(&ep->dev);
 233         if (err)
 234                 goto put_dev;
 235
 236         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 237         if (err)
 238                 goto unregister_dev;
 239
 240         if (dd_size)
 241                 ep->dd_data = &ep[1];
 242         return ep;
 243
 244 unregister_dev:
 245         device_unregister(&ep->dev);
 246         return NULL;
 247
 248 put_dev:
 249         mutex_lock(&iscsi_ep_idr_mutex);
 250         idr_remove(&iscsi_ep_idr, id);
 251         mutex_unlock(&iscsi_ep_idr_mutex);
 252         put_device(&ep->dev);
 253         return NULL;
 254 free_ep:
 255         kfree(ep);
 256         return NULL;
 257 }
 258 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 259
 260 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 261 {
 262         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 263         device_unregister(&ep->dev);
 264 }
 265 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 266
 267 void iscsi_put_endpoint(struct iscsi_endpoint *ep)
 268 {
 269         put_device(&ep->dev);
 270 }
 271 EXPORT_SYMBOL_GPL(iscsi_put_endpoint);
 272
 273 /**
 274  * iscsi_lookup_endpoint - get ep from handle
 275  * @handle: endpoint handle
 276  *
 277  * Caller must do a iscsi_put_endpoint.
 278  */
 279 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 280 {
 281         struct iscsi_endpoint *ep;
 282
 283         mutex_lock(&iscsi_ep_idr_mutex);
 284         ep = idr_find(&iscsi_ep_idr, handle);
 285         if (!ep)
 286                 goto unlock;
 287
 288         get_device(&ep->dev);
 289 unlock:
 290         mutex_unlock(&iscsi_ep_idr_mutex);
 291         return ep;
 292 }
 293 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 294
 295 /*
 296  * Interface to display network param to sysfs
 297  */
 298
 299 static void iscsi_iface_release(struct device *dev)
 300 {
 301         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 302         struct device *parent = iface->dev.parent;
 303
 304         kfree(iface);
 305         put_device(parent);
 306 }
 307
 308
 309 static struct class iscsi_iface_class = {
 310         .name = "iscsi_iface",
 311         .dev_release = iscsi_iface_release,
 312 };
 313
 314 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 315 struct device_attribute dev_attr_##_prefix##_##_name =          \
 316         __ATTR(_name, _mode, _show, _store)
 317
 318 /* iface attrs show */
 319 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 320 static ssize_t                                                          \
 321 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 322                      char *buf)                                         \
 323 {                                                                       \
 324         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 325         struct iscsi_transport *t = iface->transport;                   \
 326         return t->get_iface_param(iface, param_type, param, buf);       \
 327 }                                                                       \
 328
 329 #define iscsi_iface_net_attr(type, name, param)                         \
 330         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 331 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 332
 333 #define iscsi_iface_attr(type, name, param)                             \
 334         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 335 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 336
 337 /* generic read only ipv4 attribute */
 338 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 339 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 340 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 341 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 342 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 343                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 344 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 345                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 346 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 347 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 348 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 349                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 350 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 351                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 352 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 353                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 354 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 355                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 356 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 357                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 358 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 359                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 360 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 361                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 362 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 363                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 364 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 365                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 366 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 367
 368 /* generic read only ipv6 attribute */
 369 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 370 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 371                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 372 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 373 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 374                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 375 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 376                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 377 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 378                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 379 iscsi_iface_net_attr(ipv6_iface, router_state,
 380                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 381 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 382                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 383 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 384 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 385 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 386                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 387 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 388 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 389                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 390 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 391                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 392 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 393                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 394 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 395                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 396 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 397                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 398
 399 /* common read only iface attribute */
 400 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 401 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 402 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 403 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 404 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 405 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 406 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 407 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 408 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 409                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 410 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 411 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 412 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 413 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 414 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 415 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 416
 417 /* common iscsi specific settings attributes */
 418 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 419 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 420 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 421 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 422 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 423 iscsi_iface_attr(iface, data_seq_in_order,
 424                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 425 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 426 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 427 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 428 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 429 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 430 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 431 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 432 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 433 iscsi_iface_attr(iface, discovery_auth_optional,
 434                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 435 iscsi_iface_attr(iface, discovery_logout,
 436                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 437 iscsi_iface_attr(iface, strict_login_comp_en,
 438                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 439 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 440
 441 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 442                                           struct attribute *attr, int i)
 443 {
 444         struct device *dev = container_of(kobj, struct device, kobj);
 445         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 446         struct iscsi_transport *t = iface->transport;
 447         int param = -1;
 448
 449         if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 450                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 451         else if (attr == &dev_attr_iface_header_digest.attr)
 452                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 453         else if (attr == &dev_attr_iface_data_digest.attr)
 454                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 455         else if (attr == &dev_attr_iface_immediate_data.attr)
 456                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 457         else if (attr == &dev_attr_iface_initial_r2t.attr)
 458                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 459         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 460                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 461         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 462                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 463         else if (attr == &dev_attr_iface_erl.attr)
 464                 param = ISCSI_IFACE_PARAM_ERL;
 465         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 466                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 467         else if (attr == &dev_attr_iface_first_burst_len.attr)
 468                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 469         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 470                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 471         else if (attr == &dev_attr_iface_max_burst_len.attr)
 472                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 473         else if (attr == &dev_attr_iface_chap_auth.attr)
 474                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 475         else if (attr == &dev_attr_iface_bidi_chap.attr)
 476                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 477         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 478                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 479         else if (attr == &dev_attr_iface_discovery_logout.attr)
 480                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 481         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 482                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 483         else if (attr == &dev_attr_iface_initiator_name.attr)
 484                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 485
 486         if (param != -1)
 487                 return t->attr_is_visible(ISCSI_IFACE_PARAM, param);
 488
 489         if (attr == &dev_attr_iface_enabled.attr)
 490                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 491         else if (attr == &dev_attr_iface_vlan_id.attr)
 492                 param = ISCSI_NET_PARAM_VLAN_ID;
 493         else if (attr == &dev_attr_iface_vlan_priority.attr)
 494                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 495         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 496                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 497         else if (attr == &dev_attr_iface_mtu.attr)
 498                 param = ISCSI_NET_PARAM_MTU;
 499         else if (attr == &dev_attr_iface_port.attr)
 500                 param = ISCSI_NET_PARAM_PORT;
 501         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 502                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 503         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 504                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 505         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 506                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 507         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 508                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 509         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 510                 param = ISCSI_NET_PARAM_TCP_WSF;
 511         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 512                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 513         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 514                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 515         else if (attr == &dev_attr_iface_cache_id.attr)
 516                 param = ISCSI_NET_PARAM_CACHE_ID;
 517         else if (attr == &dev_attr_iface_redirect_en.attr)
 518                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 519         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 520                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 521                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 522                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 523                         param = ISCSI_NET_PARAM_IPV4_GW;
 524                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 525                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 526                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 527                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 528                 else if (attr ==
 529                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 530                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 531                 else if (attr ==
 532                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 533                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 534                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 535                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 536                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 537                         param = ISCSI_NET_PARAM_IPV4_TOS;
 538                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 539                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 540                 else if (attr ==
 541                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 542                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 543                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 544                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 545                 else if (attr ==
 546                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 547                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 548                 else if (attr ==
 549                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 550                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 551                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 552                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 553                 else if (attr ==
 554                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 555                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 556                 else if (attr ==
 557                          &dev_attr_ipv4_iface_fragment_disable.attr)
 558                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 559                 else if (attr ==
 560                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 561                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 562                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 563                         param = ISCSI_NET_PARAM_IPV4_TTL;
 564                 else
 565                         return 0;
 566         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 567                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 568                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 569                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 570                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 571                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 572                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 573                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 574                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 575                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 576                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 577                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 578                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 579                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 580                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 581                 else if (attr ==
 582                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 583                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 584                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 585                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 586                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 587                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 588                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 589                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 590                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 591                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 592                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 593                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 594                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 595                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 596                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 597                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 598                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 599                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 600                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 601                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 602                 else
 603                         return 0;
 604         } else {
 605                 WARN_ONCE(1, "Invalid iface attr");
 606                 return 0;
 607         }
 608
 609         return t->attr_is_visible(ISCSI_NET_PARAM, param);
 610 }
 611
 612 static struct attribute *iscsi_iface_attrs[] = {
 613         &dev_attr_iface_enabled.attr,
 614         &dev_attr_iface_vlan_id.attr,
 615         &dev_attr_iface_vlan_priority.attr,
 616         &dev_attr_iface_vlan_enabled.attr,
 617         &dev_attr_ipv4_iface_ipaddress.attr,
 618         &dev_attr_ipv4_iface_gateway.attr,
 619         &dev_attr_ipv4_iface_subnet.attr,
 620         &dev_attr_ipv4_iface_bootproto.attr,
 621         &dev_attr_ipv6_iface_ipaddress.attr,
 622         &dev_attr_ipv6_iface_link_local_addr.attr,
 623         &dev_attr_ipv6_iface_router_addr.attr,
 624         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 625         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 626         &dev_attr_iface_mtu.attr,
 627         &dev_attr_iface_port.attr,
 628         &dev_attr_iface_ipaddress_state.attr,
 629         &dev_attr_iface_delayed_ack_en.attr,
 630         &dev_attr_iface_tcp_nagle_disable.attr,
 631         &dev_attr_iface_tcp_wsf_disable.attr,
 632         &dev_attr_iface_tcp_wsf.attr,
 633         &dev_attr_iface_tcp_timer_scale.attr,
 634         &dev_attr_iface_tcp_timestamp_en.attr,
 635         &dev_attr_iface_cache_id.attr,
 636         &dev_attr_iface_redirect_en.attr,
 637         &dev_attr_iface_def_taskmgmt_tmo.attr,
 638         &dev_attr_iface_header_digest.attr,
 639         &dev_attr_iface_data_digest.attr,
 640         &dev_attr_iface_immediate_data.attr,
 641         &dev_attr_iface_initial_r2t.attr,
 642         &dev_attr_iface_data_seq_in_order.attr,
 643         &dev_attr_iface_data_pdu_in_order.attr,
 644         &dev_attr_iface_erl.attr,
 645         &dev_attr_iface_max_recv_dlength.attr,
 646         &dev_attr_iface_first_burst_len.attr,
 647         &dev_attr_iface_max_outstanding_r2t.attr,
 648         &dev_attr_iface_max_burst_len.attr,
 649         &dev_attr_iface_chap_auth.attr,
 650         &dev_attr_iface_bidi_chap.attr,
 651         &dev_attr_iface_discovery_auth_optional.attr,
 652         &dev_attr_iface_discovery_logout.attr,
 653         &dev_attr_iface_strict_login_comp_en.attr,
 654         &dev_attr_iface_initiator_name.attr,
 655         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 656         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 657         &dev_attr_ipv4_iface_tos_en.attr,
 658         &dev_attr_ipv4_iface_tos.attr,
 659         &dev_attr_ipv4_iface_grat_arp_en.attr,
 660         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 661         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 662         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 663         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 664         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 665         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 666         &dev_attr_ipv4_iface_fragment_disable.attr,
 667         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 668         &dev_attr_ipv4_iface_ttl.attr,
 669         &dev_attr_ipv6_iface_link_local_state.attr,
 670         &dev_attr_ipv6_iface_router_state.attr,
 671         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 672         &dev_attr_ipv6_iface_mld_en.attr,
 673         &dev_attr_ipv6_iface_flow_label.attr,
 674         &dev_attr_ipv6_iface_traffic_class.attr,
 675         &dev_attr_ipv6_iface_hop_limit.attr,
 676         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 677         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 678         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 679         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 680         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 681         NULL,
 682 };
 683
 684 static struct attribute_group iscsi_iface_group = {
 685         .attrs = iscsi_iface_attrs,
 686         .is_visible = iscsi_iface_attr_is_visible,
 687 };
 688
 689 /* convert iscsi_ipaddress_state values to ascii string name */
 690 static const struct {
 691         enum iscsi_ipaddress_state      value;
 692         char                            *name;
 693 } iscsi_ipaddress_state_names[] = {
 694         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 695         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 696         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 697         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 698         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 699         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 700         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 701 };
 702
 703 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 704 {
 705         int i;
 706         char *state = NULL;
 707
 708         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 709                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 710                         state = iscsi_ipaddress_state_names[i].name;
 711                         break;
 712                 }
 713         }
 714         return state;
 715 }
 716 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 717
 718 /* convert iscsi_router_state values to ascii string name */
 719 static const struct {
 720         enum iscsi_router_state value;
 721         char                    *name;
 722 } iscsi_router_state_names[] = {
 723         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 724         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 725         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 726         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 727 };
 728
 729 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 730 {
 731         int i;
 732         char *state = NULL;
 733
 734         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 735                 if (iscsi_router_state_names[i].value == router_state) {
 736                         state = iscsi_router_state_names[i].name;
 737                         break;
 738                 }
 739         }
 740         return state;
 741 }
 742 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 743
 744 struct iscsi_iface *
 745 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 746                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 747 {
 748         struct iscsi_iface *iface;
 749         int err;
 750
 751         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 752         if (!iface)
 753                 return NULL;
 754
 755         iface->transport = transport;
 756         iface->iface_type = iface_type;
 757         iface->iface_num = iface_num;
 758         iface->dev.release = iscsi_iface_release;
 759         iface->dev.class = &iscsi_iface_class;
 760         /* parent reference released in iscsi_iface_release */
 761         iface->dev.parent = get_device(&shost->shost_gendev);
 762         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 763                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 764                              iface_num);
 765         else
 766                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 767                              iface_num);
 768
 769         err = device_register(&iface->dev);
 770         if (err)
 771                 goto put_dev;
 772
 773         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 774         if (err)
 775                 goto unreg_iface;
 776
 777         if (dd_size)
 778                 iface->dd_data = &iface[1];
 779         return iface;
 780
 781 unreg_iface:
 782         device_unregister(&iface->dev);
 783         return NULL;
 784
 785 put_dev:
 786         put_device(&iface->dev);
 787         return NULL;
 788 }
 789 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 790
 791 void iscsi_destroy_iface(struct iscsi_iface *iface)
 792 {
 793         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 794         device_unregister(&iface->dev);
 795 }
 796 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 797
 798 /*
 799  * Interface to display flash node params to sysfs
 800  */
 801
 802 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 803 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 804         __ATTR(_name, _mode, _show, _store)
 805
 806 /* flash node session attrs show */
 807 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 808 static ssize_t                                                          \
 809 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 810                      char *buf)                                         \
 811 {                                                                       \
 812         struct iscsi_bus_flash_session *fnode_sess =                    \
 813                                         iscsi_dev_to_flash_session(dev);\
 814         struct iscsi_transport *t = fnode_sess->transport;              \
 815         return t->get_flashnode_param(fnode_sess, param, buf);          \
 816 }                                                                       \
 817
 818
 819 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 820         iscsi_flashnode_sess_attr_show(type, name, param)               \
 821 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 822                             show_##type##_##name, NULL);
 823
 824 /* Flash node session attributes */
 825
 826 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 827                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 828 iscsi_flashnode_sess_attr(fnode, discovery_session,
 829                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 830 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 831 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 832 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 833 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 834 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 835                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 836 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 837                           ISCSI_FLASHNODE_PDU_INORDER);
 838 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 839 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 840                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 841 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 842 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 843                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 844 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 845 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 846 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 847 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 848                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 849 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 850 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 851 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 852 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 853 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 854                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 855 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 856 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 857 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 858 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 859                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 860 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 861                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 862 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 863 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 864 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 865 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 866 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 867 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 868 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 869
 870 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 871         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 872         &dev_attr_fnode_discovery_session.attr,
 873         &dev_attr_fnode_portal_type.attr,
 874         &dev_attr_fnode_entry_enable.attr,
 875         &dev_attr_fnode_immediate_data.attr,
 876         &dev_attr_fnode_initial_r2t.attr,
 877         &dev_attr_fnode_data_seq_in_order.attr,
 878         &dev_attr_fnode_data_pdu_in_order.attr,
 879         &dev_attr_fnode_chap_auth.attr,
 880         &dev_attr_fnode_discovery_logout.attr,
 881         &dev_attr_fnode_bidi_chap.attr,
 882         &dev_attr_fnode_discovery_auth_optional.attr,
 883         &dev_attr_fnode_erl.attr,
 884         &dev_attr_fnode_first_burst_len.attr,
 885         &dev_attr_fnode_def_time2wait.attr,
 886         &dev_attr_fnode_def_time2retain.attr,
 887         &dev_attr_fnode_max_outstanding_r2t.attr,
 888         &dev_attr_fnode_isid.attr,
 889         &dev_attr_fnode_tsid.attr,
 890         &dev_attr_fnode_max_burst_len.attr,
 891         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 892         &dev_attr_fnode_targetalias.attr,
 893         &dev_attr_fnode_targetname.attr,
 894         &dev_attr_fnode_tpgt.attr,
 895         &dev_attr_fnode_discovery_parent_idx.attr,
 896         &dev_attr_fnode_discovery_parent_type.attr,
 897         &dev_attr_fnode_chap_in_idx.attr,
 898         &dev_attr_fnode_chap_out_idx.attr,
 899         &dev_attr_fnode_username.attr,
 900         &dev_attr_fnode_username_in.attr,
 901         &dev_attr_fnode_password.attr,
 902         &dev_attr_fnode_password_in.attr,
 903         &dev_attr_fnode_is_boot_target.attr,
 904         NULL,
 905 };
 906
 907 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 908                                                     struct attribute *attr,
 909                                                     int i)
 910 {
 911         struct device *dev = container_of(kobj, struct device, kobj);
 912         struct iscsi_bus_flash_session *fnode_sess =
 913                                                 iscsi_dev_to_flash_session(dev);
 914         struct iscsi_transport *t = fnode_sess->transport;
 915         int param;
 916
 917         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 918                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 919         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 920                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 921         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 922                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 923         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 924                 param = ISCSI_FLASHNODE_ENTRY_EN;
 925         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 926                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 927         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 928                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 929         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 930                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 931         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 932                 param = ISCSI_FLASHNODE_PDU_INORDER;
 933         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 934                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 935         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 936                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 937         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 938                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 939         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 940                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 941         } else if (attr == &dev_attr_fnode_erl.attr) {
 942                 param = ISCSI_FLASHNODE_ERL;
 943         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 944                 param = ISCSI_FLASHNODE_FIRST_BURST;
 945         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 946                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 947         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 948                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 949         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 950                 param = ISCSI_FLASHNODE_MAX_R2T;
 951         } else if (attr == &dev_attr_fnode_isid.attr) {
 952                 param = ISCSI_FLASHNODE_ISID;
 953         } else if (attr == &dev_attr_fnode_tsid.attr) {
 954                 param = ISCSI_FLASHNODE_TSID;
 955         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 956                 param = ISCSI_FLASHNODE_MAX_BURST;
 957         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 958                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 959         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 960                 param = ISCSI_FLASHNODE_ALIAS;
 961         } else if (attr == &dev_attr_fnode_targetname.attr) {
 962                 param = ISCSI_FLASHNODE_NAME;
 963         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 964                 param = ISCSI_FLASHNODE_TPGT;
 965         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 966                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 967         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 968                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 969         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 970                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 971         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 972                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 973         } else if (attr == &dev_attr_fnode_username.attr) {
 974                 param = ISCSI_FLASHNODE_USERNAME;
 975         } else if (attr == &dev_attr_fnode_username_in.attr) {
 976                 param = ISCSI_FLASHNODE_USERNAME_IN;
 977         } else if (attr == &dev_attr_fnode_password.attr) {
 978                 param = ISCSI_FLASHNODE_PASSWORD;
 979         } else if (attr == &dev_attr_fnode_password_in.attr) {
 980                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 981         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 982                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 983         } else {
 984                 WARN_ONCE(1, "Invalid flashnode session attr");
 985                 return 0;
 986         }
 987
 988         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 989 }
 990
 991 static struct attribute_group iscsi_flashnode_sess_attr_group = {
 992         .attrs = iscsi_flashnode_sess_attrs,
 993         .is_visible = iscsi_flashnode_sess_attr_is_visible,
 994 };
 995
 996 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
 997         &iscsi_flashnode_sess_attr_group,
 998         NULL,
 999 };
1000
1001 static void iscsi_flashnode_sess_release(struct device *dev)
1002 {
1003         struct iscsi_bus_flash_session *fnode_sess =
1004                                                 iscsi_dev_to_flash_session(dev);
1005
1006         kfree(fnode_sess->targetname);
1007         kfree(fnode_sess->targetalias);
1008         kfree(fnode_sess->portal_type);
1009         kfree(fnode_sess);
1010 }
1011
1012 static const struct device_type iscsi_flashnode_sess_dev_type = {
1013         .name = "iscsi_flashnode_sess_dev_type",
1014         .groups = iscsi_flashnode_sess_attr_groups,
1015         .release = iscsi_flashnode_sess_release,
1016 };
1017
1018 /* flash node connection attrs show */
1019 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1020 static ssize_t                                                          \
1021 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1022                      char *buf)                                         \
1023 {                                                                       \
1024         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1025         struct iscsi_bus_flash_session *fnode_sess =                    \
1026                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1027         struct iscsi_transport *t = fnode_conn->transport;              \
1028         return t->get_flashnode_param(fnode_sess, param, buf);          \
1029 }                                                                       \
1030
1031
1032 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1033         iscsi_flashnode_conn_attr_show(type, name, param)               \
1034 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1035                             show_##type##_##name, NULL);
1036
1037 /* Flash node connection attributes */
1038
1039 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1040                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1041 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1042 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1043 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1044 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1045                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1046 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1047                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1048 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1049                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1050 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1051                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1052 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1053                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1054 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1055                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1056 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1057 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1058 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1059 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1060                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1061 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1062                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1063 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1064 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1065 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1066 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1067                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1068 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1069                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1070 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1071                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1072 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1073                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1074 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1075 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1076 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1077 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1078
1079 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1080         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1081         &dev_attr_fnode_header_digest.attr,
1082         &dev_attr_fnode_data_digest.attr,
1083         &dev_attr_fnode_snack_req.attr,
1084         &dev_attr_fnode_tcp_timestamp_stat.attr,
1085         &dev_attr_fnode_tcp_nagle_disable.attr,
1086         &dev_attr_fnode_tcp_wsf_disable.attr,
1087         &dev_attr_fnode_tcp_timer_scale.attr,
1088         &dev_attr_fnode_tcp_timestamp_enable.attr,
1089         &dev_attr_fnode_fragment_disable.attr,
1090         &dev_attr_fnode_max_recv_dlength.attr,
1091         &dev_attr_fnode_max_xmit_dlength.attr,
1092         &dev_attr_fnode_keepalive_tmo.attr,
1093         &dev_attr_fnode_port.attr,
1094         &dev_attr_fnode_ipaddress.attr,
1095         &dev_attr_fnode_redirect_ipaddr.attr,
1096         &dev_attr_fnode_max_segment_size.attr,
1097         &dev_attr_fnode_local_port.attr,
1098         &dev_attr_fnode_ipv4_tos.attr,
1099         &dev_attr_fnode_ipv6_traffic_class.attr,
1100         &dev_attr_fnode_ipv6_flow_label.attr,
1101         &dev_attr_fnode_link_local_ipv6.attr,
1102         &dev_attr_fnode_tcp_xmit_wsf.attr,
1103         &dev_attr_fnode_tcp_recv_wsf.attr,
1104         &dev_attr_fnode_statsn.attr,
1105         &dev_attr_fnode_exp_statsn.attr,
1106         NULL,
1107 };
1108
1109 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1110                                                     struct attribute *attr,
1111                                                     int i)
1112 {
1113         struct device *dev = container_of(kobj, struct device, kobj);
1114         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1115         struct iscsi_transport *t = fnode_conn->transport;
1116         int param;
1117
1118         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1119                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1120         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1121                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1122         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1123                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1124         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1125                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1126         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1127                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1128         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1129                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1130         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1131                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1132         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1133                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1134         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1135                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1136         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1137                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1138         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1139                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1140         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1141                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1142         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1143                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1144         } else if (attr == &dev_attr_fnode_port.attr) {
1145                 param = ISCSI_FLASHNODE_PORT;
1146         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1147                 param = ISCSI_FLASHNODE_IPADDR;
1148         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1149                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1150         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1151                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1152         } else if (attr == &dev_attr_fnode_local_port.attr) {
1153                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1154         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1155                 param = ISCSI_FLASHNODE_IPV4_TOS;
1156         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1157                 param = ISCSI_FLASHNODE_IPV6_TC;
1158         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1159                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1160         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1161                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1162         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1163                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1164         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1165                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1166         } else if (attr == &dev_attr_fnode_statsn.attr) {
1167                 param = ISCSI_FLASHNODE_STATSN;
1168         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1169                 param = ISCSI_FLASHNODE_EXP_STATSN;
1170         } else {
1171                 WARN_ONCE(1, "Invalid flashnode connection attr");
1172                 return 0;
1173         }
1174
1175         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1176 }
1177
1178 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1179         .attrs = iscsi_flashnode_conn_attrs,
1180         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1181 };
1182
1183 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1184         &iscsi_flashnode_conn_attr_group,
1185         NULL,
1186 };
1187
1188 static void iscsi_flashnode_conn_release(struct device *dev)
1189 {
1190         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1191
1192         kfree(fnode_conn->ipaddress);
1193         kfree(fnode_conn->redirect_ipaddr);
1194         kfree(fnode_conn->link_local_ipv6_addr);
1195         kfree(fnode_conn);
1196 }
1197
1198 static const struct device_type iscsi_flashnode_conn_dev_type = {
1199         .name = "iscsi_flashnode_conn_dev_type",
1200         .groups = iscsi_flashnode_conn_attr_groups,
1201         .release = iscsi_flashnode_conn_release,
1202 };
1203
1204 static struct bus_type iscsi_flashnode_bus;
1205
1206 int iscsi_flashnode_bus_match(struct device *dev,
1207                                      struct device_driver *drv)
1208 {
1209         if (dev->bus == &iscsi_flashnode_bus)
1210                 return 1;
1211         return 0;
1212 }
1213 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1214
1215 static struct bus_type iscsi_flashnode_bus = {
1216         .name = "iscsi_flashnode",
1217         .match = &iscsi_flashnode_bus_match,
1218 };
1219
1220 /**
1221  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1222  * @shost: pointer to host data
1223  * @index: index of flashnode to add in sysfs
1224  * @transport: pointer to transport data
1225  * @dd_size: total size to allocate
1226  *
1227  * Adds a sysfs entry for the flashnode session attributes
1228  *
1229  * Returns:
1230  *  pointer to allocated flashnode sess on success
1231  *  %NULL on failure
1232  */
1233 struct iscsi_bus_flash_session *
1234 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1235                             struct iscsi_transport *transport,
1236                             int dd_size)
1237 {
1238         struct iscsi_bus_flash_session *fnode_sess;
1239         int err;
1240
1241         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1242         if (!fnode_sess)
1243                 return NULL;
1244
1245         fnode_sess->transport = transport;
1246         fnode_sess->target_id = index;
1247         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1248         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1249         fnode_sess->dev.parent = &shost->shost_gendev;
1250         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1251                      shost->host_no, index);
1252
1253         err = device_register(&fnode_sess->dev);
1254         if (err)
1255                 goto put_dev;
1256
1257         if (dd_size)
1258                 fnode_sess->dd_data = &fnode_sess[1];
1259
1260         return fnode_sess;
1261
1262 put_dev:
1263         put_device(&fnode_sess->dev);
1264         return NULL;
1265 }
1266 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1267
1268 /**
1269  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1270  * @shost: pointer to host data
1271  * @fnode_sess: pointer to the parent flashnode session entry
1272  * @transport: pointer to transport data
1273  * @dd_size: total size to allocate
1274  *
1275  * Adds a sysfs entry for the flashnode connection attributes
1276  *
1277  * Returns:
1278  *  pointer to allocated flashnode conn on success
1279  *  %NULL on failure
1280  */
1281 struct iscsi_bus_flash_conn *
1282 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1283                             struct iscsi_bus_flash_session *fnode_sess,
1284                             struct iscsi_transport *transport,
1285                             int dd_size)
1286 {
1287         struct iscsi_bus_flash_conn *fnode_conn;
1288         int err;
1289
1290         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1291         if (!fnode_conn)
1292                 return NULL;
1293
1294         fnode_conn->transport = transport;
1295         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1296         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1297         fnode_conn->dev.parent = &fnode_sess->dev;
1298         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1299                      shost->host_no, fnode_sess->target_id);
1300
1301         err = device_register(&fnode_conn->dev);
1302         if (err)
1303                 goto put_dev;
1304
1305         if (dd_size)
1306                 fnode_conn->dd_data = &fnode_conn[1];
1307
1308         return fnode_conn;
1309
1310 put_dev:
1311         put_device(&fnode_conn->dev);
1312         return NULL;
1313 }
1314 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1315
1316 /**
1317  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1318  * @dev: device to verify
1319  * @data: pointer to data containing value to use for verification
1320  *
1321  * Verifies if the passed device is flashnode conn device
1322  *
1323  * Returns:
1324  *  1 on success
1325  *  0 on failure
1326  */
1327 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1328 {
1329         return dev->bus == &iscsi_flashnode_bus;
1330 }
1331
1332 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1333 {
1334         device_unregister(&fnode_conn->dev);
1335         return 0;
1336 }
1337
1338 static int flashnode_match_index(struct device *dev, void *data)
1339 {
1340         struct iscsi_bus_flash_session *fnode_sess = NULL;
1341         int ret = 0;
1342
1343         if (!iscsi_flashnode_bus_match(dev, NULL))
1344                 goto exit_match_index;
1345
1346         fnode_sess = iscsi_dev_to_flash_session(dev);
1347         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1348
1349 exit_match_index:
1350         return ret;
1351 }
1352
1353 /**
1354  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1355  * @shost: pointer to host data
1356  * @idx: index to match
1357  *
1358  * Finds the flashnode session object for the passed index
1359  *
1360  * Returns:
1361  *  pointer to found flashnode session object on success
1362  *  %NULL on failure
1363  */
1364 static struct iscsi_bus_flash_session *
1365 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1366 {
1367         struct iscsi_bus_flash_session *fnode_sess = NULL;
1368         struct device *dev;
1369
1370         dev = device_find_child(&shost->shost_gendev, &idx,
1371                                 flashnode_match_index);
1372         if (dev)
1373                 fnode_sess = iscsi_dev_to_flash_session(dev);
1374
1375         return fnode_sess;
1376 }
1377
1378 /**
1379  * iscsi_find_flashnode_sess - finds flashnode session entry
1380  * @shost: pointer to host data
1381  * @data: pointer to data containing value to use for comparison
1382  * @fn: function pointer that does actual comparison
1383  *
1384  * Finds the flashnode session object comparing the data passed using logic
1385  * defined in passed function pointer
1386  *
1387  * Returns:
1388  *  pointer to found flashnode session device object on success
1389  *  %NULL on failure
1390  */
1391 struct device *
1392 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1393                           int (*fn)(struct device *dev, void *data))
1394 {
1395         return device_find_child(&shost->shost_gendev, data, fn);
1396 }
1397 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1398
1399 /**
1400  * iscsi_find_flashnode_conn - finds flashnode connection entry
1401  * @fnode_sess: pointer to parent flashnode session entry
1402  *
1403  * Finds the flashnode connection object comparing the data passed using logic
1404  * defined in passed function pointer
1405  *
1406  * Returns:
1407  *  pointer to found flashnode connection device object on success
1408  *  %NULL on failure
1409  */
1410 struct device *
1411 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1412 {
1413         return device_find_child(&fnode_sess->dev, NULL,
1414                                  iscsi_is_flashnode_conn_dev);
1415 }
1416 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1417
1418 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1419 {
1420         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1421                 return 0;
1422
1423         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1424 }
1425
1426 /**
1427  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1428  * @fnode_sess: pointer to flashnode session entry to be destroyed
1429  *
1430  * Deletes the flashnode session entry and all children flashnode connection
1431  * entries from sysfs
1432  */
1433 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1434 {
1435         int err;
1436
1437         err = device_for_each_child(&fnode_sess->dev, NULL,
1438                                     iscsi_iter_destroy_flashnode_conn_fn);
1439         if (err)
1440                 pr_err("Could not delete all connections for %s. Error %d.\n",
1441                        fnode_sess->dev.kobj.name, err);
1442
1443         device_unregister(&fnode_sess->dev);
1444 }
1445 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1446
1447 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1448 {
1449         if (!iscsi_flashnode_bus_match(dev, NULL))
1450                 return 0;
1451
1452         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1453         return 0;
1454 }
1455
1456 /**
1457  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1458  * @shost: pointer to host data
1459  *
1460  * Destroys all the flashnode session entries and all corresponding children
1461  * flashnode connection entries from sysfs
1462  */
1463 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1464 {
1465         device_for_each_child(&shost->shost_gendev, NULL,
1466                               iscsi_iter_destroy_flashnode_fn);
1467 }
1468 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1469
1470 /*
1471  * BSG support
1472  */
1473 /**
1474  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1475  * @job: bsg job to be processed
1476  */
1477 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1478 {
1479         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1480         struct iscsi_bsg_request *req = job->request;
1481         struct iscsi_bsg_reply *reply = job->reply;
1482         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1483         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1484         int ret;
1485
1486         /* check if we have the msgcode value at least */
1487         if (job->request_len < sizeof(uint32_t)) {
1488                 ret = -ENOMSG;
1489                 goto fail_host_msg;
1490         }
1491
1492         /* Validate the host command */
1493         switch (req->msgcode) {
1494         case ISCSI_BSG_HST_VENDOR:
1495                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1496                 if ((shost->hostt->vendor_id == 0L) ||
1497                     (req->rqst_data.h_vendor.vendor_id !=
1498                         shost->hostt->vendor_id)) {
1499                         ret = -ESRCH;
1500                         goto fail_host_msg;
1501                 }
1502                 break;
1503         default:
1504                 ret = -EBADR;
1505                 goto fail_host_msg;
1506         }
1507
1508         /* check if we really have all the request data needed */
1509         if (job->request_len < cmdlen) {
1510                 ret = -ENOMSG;
1511                 goto fail_host_msg;
1512         }
1513
1514         ret = i->iscsi_transport->bsg_request(job);
1515         if (!ret)
1516                 return 0;
1517
1518 fail_host_msg:
1519         /* return the errno failure code as the only status */
1520         BUG_ON(job->reply_len < sizeof(uint32_t));
1521         reply->reply_payload_rcv_len = 0;
1522         reply->result = ret;
1523         job->reply_len = sizeof(uint32_t);
1524         bsg_job_done(job, ret, 0);
1525         return 0;
1526 }
1527
1528 /**
1529  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1530  * @shost: shost for iscsi_host
1531  * @ihost: iscsi_cls_host adding the structures to
1532  */
1533 static int
1534 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1535 {
1536         struct device *dev = &shost->shost_gendev;
1537         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1538         struct request_queue *q;
1539         char bsg_name[20];
1540
1541         if (!i->iscsi_transport->bsg_request)
1542                 return -ENOTSUPP;
1543
1544         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1545         q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1546         if (IS_ERR(q)) {
1547                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1548                              "initialize - no request queue\n");
1549                 return PTR_ERR(q);
1550         }
1551         __scsi_init_queue(shost, q);
1552
1553         ihost->bsg_q = q;
1554         return 0;
1555 }
1556
1557 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1558                             struct device *cdev)
1559 {
1560         struct Scsi_Host *shost = dev_to_shost(dev);
1561         struct iscsi_cls_host *ihost = shost->shost_data;
1562
1563         memset(ihost, 0, sizeof(*ihost));
1564         mutex_init(&ihost->mutex);
1565
1566         iscsi_bsg_host_add(shost, ihost);
1567         /* ignore any bsg add error - we just can't do sgio */
1568
1569         return 0;
1570 }
1571
1572 static int iscsi_remove_host(struct transport_container *tc,
1573                              struct device *dev, struct device *cdev)
1574 {
1575         struct Scsi_Host *shost = dev_to_shost(dev);
1576         struct iscsi_cls_host *ihost = shost->shost_data;
1577
1578         bsg_remove_queue(ihost->bsg_q);
1579         return 0;
1580 }
1581
1582 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1583                                "iscsi_host",
1584                                iscsi_setup_host,
1585                                iscsi_remove_host,
1586                                NULL);
1587
1588 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1589                                "iscsi_session",
1590                                NULL,
1591                                NULL,
1592                                NULL);
1593
1594 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1595                                "iscsi_connection",
1596                                NULL,
1597                                NULL,
1598                                NULL);
1599
1600 static struct sock *nls;
1601 static DEFINE_MUTEX(rx_queue_mutex);
1602
1603 static LIST_HEAD(sesslist);
1604 static DEFINE_SPINLOCK(sesslock);
1605 static LIST_HEAD(connlist);
1606 static LIST_HEAD(connlist_err);
1607 static DEFINE_SPINLOCK(connlock);
1608
1609 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1610 {
1611         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1612         return sess->sid;
1613 }
1614
1615 /*
1616  * Returns the matching session to a given sid
1617  */
1618 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1619 {
1620         unsigned long flags;
1621         struct iscsi_cls_session *sess;
1622
1623         spin_lock_irqsave(&sesslock, flags);
1624         list_for_each_entry(sess, &sesslist, sess_list) {
1625                 if (sess->sid == sid) {
1626                         spin_unlock_irqrestore(&sesslock, flags);
1627                         return sess;
1628                 }
1629         }
1630         spin_unlock_irqrestore(&sesslock, flags);
1631         return NULL;
1632 }
1633
1634 /*
1635  * Returns the matching connection to a given sid / cid tuple
1636  */
1637 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1638 {
1639         unsigned long flags;
1640         struct iscsi_cls_conn *conn;
1641
1642         spin_lock_irqsave(&connlock, flags);
1643         list_for_each_entry(conn, &connlist, conn_list) {
1644                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1645                         spin_unlock_irqrestore(&connlock, flags);
1646                         return conn;
1647                 }
1648         }
1649         spin_unlock_irqrestore(&connlock, flags);
1650         return NULL;
1651 }
1652
1653 /*
1654  * The following functions can be used by LLDs that allocate
1655  * their own scsi_hosts or by software iscsi LLDs
1656  */
1657 static struct {
1658         int value;
1659         char *name;
1660 } iscsi_session_state_names[] = {
1661         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1662         { ISCSI_SESSION_FAILED,         "FAILED" },
1663         { ISCSI_SESSION_FREE,           "FREE" },
1664 };
1665
1666 static const char *iscsi_session_state_name(int state)
1667 {
1668         int i;
1669         char *name = NULL;
1670
1671         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1672                 if (iscsi_session_state_names[i].value == state) {
1673                         name = iscsi_session_state_names[i].name;
1674                         break;
1675                 }
1676         }
1677         return name;
1678 }
1679
1680 static char *iscsi_session_target_state_name[] = {
1681         [ISCSI_SESSION_TARGET_UNBOUND]   = "UNBOUND",
1682         [ISCSI_SESSION_TARGET_ALLOCATED] = "ALLOCATED",
1683         [ISCSI_SESSION_TARGET_SCANNED]   = "SCANNED",
1684         [ISCSI_SESSION_TARGET_UNBINDING] = "UNBINDING",
1685 };
1686
1687 int iscsi_session_chkready(struct iscsi_cls_session *session)
1688 {
1689         int err;
1690
1691         switch (session->state) {
1692         case ISCSI_SESSION_LOGGED_IN:
1693                 err = 0;
1694                 break;
1695         case ISCSI_SESSION_FAILED:
1696                 err = DID_IMM_RETRY << 16;
1697                 break;
1698         case ISCSI_SESSION_FREE:
1699                 err = DID_TRANSPORT_FAILFAST << 16;
1700                 break;
1701         default:
1702                 err = DID_NO_CONNECT << 16;
1703                 break;
1704         }
1705         return err;
1706 }
1707 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1708
1709 int iscsi_is_session_online(struct iscsi_cls_session *session)
1710 {
1711         unsigned long flags;
1712         int ret = 0;
1713
1714         spin_lock_irqsave(&session->lock, flags);
1715         if (session->state == ISCSI_SESSION_LOGGED_IN)
1716                 ret = 1;
1717         spin_unlock_irqrestore(&session->lock, flags);
1718         return ret;
1719 }
1720 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1721
1722 static void iscsi_session_release(struct device *dev)
1723 {
1724         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1725         struct Scsi_Host *shost;
1726
1727         shost = iscsi_session_to_shost(session);
1728         scsi_host_put(shost);
1729         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1730         kfree(session);
1731 }
1732
1733 int iscsi_is_session_dev(const struct device *dev)
1734 {
1735         return dev->release == iscsi_session_release;
1736 }
1737 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1738
1739 static int iscsi_iter_session_fn(struct device *dev, void *data)
1740 {
1741         void (* fn) (struct iscsi_cls_session *) = data;
1742
1743         if (!iscsi_is_session_dev(dev))
1744                 return 0;
1745         fn(iscsi_dev_to_session(dev));
1746         return 0;
1747 }
1748
1749 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1750                                  void (*fn)(struct iscsi_cls_session *))
1751 {
1752         device_for_each_child(&shost->shost_gendev, fn,
1753                               iscsi_iter_session_fn);
1754 }
1755 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1756
1757 struct iscsi_scan_data {
1758         unsigned int channel;
1759         unsigned int id;
1760         u64 lun;
1761         enum scsi_scan_mode rescan;
1762 };
1763
1764 static int iscsi_user_scan_session(struct device *dev, void *data)
1765 {
1766         struct iscsi_scan_data *scan_data = data;
1767         struct iscsi_cls_session *session;
1768         struct Scsi_Host *shost;
1769         struct iscsi_cls_host *ihost;
1770         unsigned long flags;
1771         unsigned int id;
1772
1773         if (!iscsi_is_session_dev(dev))
1774                 return 0;
1775
1776         session = iscsi_dev_to_session(dev);
1777
1778         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1779
1780         shost = iscsi_session_to_shost(session);
1781         ihost = shost->shost_data;
1782
1783         mutex_lock(&ihost->mutex);
1784         spin_lock_irqsave(&session->lock, flags);
1785         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1786                 spin_unlock_irqrestore(&session->lock, flags);
1787                 goto user_scan_exit;
1788         }
1789         id = session->target_id;
1790         spin_unlock_irqrestore(&session->lock, flags);
1791
1792         if (id != ISCSI_MAX_TARGET) {
1793                 if ((scan_data->channel == SCAN_WILD_CARD ||
1794                      scan_data->channel == 0) &&
1795                     (scan_data->id == SCAN_WILD_CARD ||
1796                      scan_data->id == id)) {
1797                         scsi_scan_target(&session->dev, 0, id,
1798                                          scan_data->lun, scan_data->rescan);
1799                         spin_lock_irqsave(&session->lock, flags);
1800                         session->target_state = ISCSI_SESSION_TARGET_SCANNED;
1801                         spin_unlock_irqrestore(&session->lock, flags);
1802                 }
1803         }
1804
1805 user_scan_exit:
1806         mutex_unlock(&ihost->mutex);
1807         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1808         return 0;
1809 }
1810
1811 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1812                            uint id, u64 lun)
1813 {
1814         struct iscsi_scan_data scan_data;
1815
1816         scan_data.channel = channel;
1817         scan_data.id = id;
1818         scan_data.lun = lun;
1819         scan_data.rescan = SCSI_SCAN_MANUAL;
1820
1821         return device_for_each_child(&shost->shost_gendev, &scan_data,
1822                                      iscsi_user_scan_session);
1823 }
1824
1825 static void iscsi_scan_session(struct work_struct *work)
1826 {
1827         struct iscsi_cls_session *session =
1828                         container_of(work, struct iscsi_cls_session, scan_work);
1829         struct iscsi_scan_data scan_data;
1830
1831         scan_data.channel = 0;
1832         scan_data.id = SCAN_WILD_CARD;
1833         scan_data.lun = SCAN_WILD_CARD;
1834         scan_data.rescan = SCSI_SCAN_RESCAN;
1835
1836         iscsi_user_scan_session(&session->dev, &scan_data);
1837 }
1838
1839 /**
1840  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1841  * @cmd: scsi cmd passed to scsi eh handler
1842  *
1843  * If the session is down this function will wait for the recovery
1844  * timer to fire or for the session to be logged back in. If the
1845  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1846  * should pass this error value to the scsi eh.
1847  */
1848 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1849 {
1850         struct iscsi_cls_session *session =
1851                         starget_to_session(scsi_target(cmd->device));
1852         unsigned long flags;
1853         int ret = 0;
1854
1855         spin_lock_irqsave(&session->lock, flags);
1856         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1857                 if (session->state == ISCSI_SESSION_FREE) {
1858                         ret = FAST_IO_FAIL;
1859                         break;
1860                 }
1861                 spin_unlock_irqrestore(&session->lock, flags);
1862                 msleep(1000);
1863                 spin_lock_irqsave(&session->lock, flags);
1864         }
1865         spin_unlock_irqrestore(&session->lock, flags);
1866         return ret;
1867 }
1868 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1869
1870 static void session_recovery_timedout(struct work_struct *work)
1871 {
1872         struct iscsi_cls_session *session =
1873                 container_of(work, struct iscsi_cls_session,
1874                              recovery_work.work);
1875         unsigned long flags;
1876
1877         iscsi_cls_session_printk(KERN_INFO, session,
1878                                  "session recovery timed out after %d secs\n",
1879                                  session->recovery_tmo);
1880
1881         spin_lock_irqsave(&session->lock, flags);
1882         switch (session->state) {
1883         case ISCSI_SESSION_FAILED:
1884                 session->state = ISCSI_SESSION_FREE;
1885                 break;
1886         case ISCSI_SESSION_LOGGED_IN:
1887         case ISCSI_SESSION_FREE:
1888                 /* we raced with the unblock's flush */
1889                 spin_unlock_irqrestore(&session->lock, flags);
1890                 return;
1891         }
1892         spin_unlock_irqrestore(&session->lock, flags);
1893
1894         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1895         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1896         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1897
1898         if (session->transport->session_recovery_timedout)
1899                 session->transport->session_recovery_timedout(session);
1900 }
1901
1902 static void __iscsi_unblock_session(struct work_struct *work)
1903 {
1904         struct iscsi_cls_session *session =
1905                         container_of(work, struct iscsi_cls_session,
1906                                      unblock_work);
1907         unsigned long flags;
1908
1909         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1910
1911         cancel_delayed_work_sync(&session->recovery_work);
1912         spin_lock_irqsave(&session->lock, flags);
1913         session->state = ISCSI_SESSION_LOGGED_IN;
1914         spin_unlock_irqrestore(&session->lock, flags);
1915         /* start IO */
1916         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1917         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1918 }
1919
1920 /**
1921  * iscsi_unblock_session - set a session as logged in and start IO.
1922  * @session: iscsi session
1923  *
1924  * Mark a session as ready to accept IO.
1925  */
1926 void iscsi_unblock_session(struct iscsi_cls_session *session)
1927 {
1928         if (!cancel_work_sync(&session->block_work))
1929                 cancel_delayed_work_sync(&session->recovery_work);
1930
1931         queue_work(session->workq, &session->unblock_work);
1932         /*
1933          * Blocking the session can be done from any context so we only
1934          * queue the block work. Make sure the unblock work has completed
1935          * because it flushes/cancels the other works and updates the state.
1936          */
1937         flush_work(&session->unblock_work);
1938 }
1939 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1940
1941 static void __iscsi_block_session(struct work_struct *work)
1942 {
1943         struct iscsi_cls_session *session =
1944                         container_of(work, struct iscsi_cls_session,
1945                                      block_work);
1946         unsigned long flags;
1947
1948         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1949         spin_lock_irqsave(&session->lock, flags);
1950         session->state = ISCSI_SESSION_FAILED;
1951         spin_unlock_irqrestore(&session->lock, flags);
1952         scsi_target_block(&session->dev);
1953         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1954         if (session->recovery_tmo >= 0)
1955                 queue_delayed_work(session->workq,
1956                                    &session->recovery_work,
1957                                    session->recovery_tmo * HZ);
1958 }
1959
1960 void iscsi_block_session(struct iscsi_cls_session *session)
1961 {
1962         queue_work(session->workq, &session->block_work);
1963 }
1964 EXPORT_SYMBOL_GPL(iscsi_block_session);
1965
1966 static void __iscsi_unbind_session(struct work_struct *work)
1967 {
1968         struct iscsi_cls_session *session =
1969                         container_of(work, struct iscsi_cls_session,
1970                                      unbind_work);
1971         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1972         struct iscsi_cls_host *ihost = shost->shost_data;
1973         unsigned long flags;
1974         unsigned int target_id;
1975         bool remove_target = true;
1976
1977         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
1978
1979         /* Prevent new scans and make sure scanning is not in progress */
1980         mutex_lock(&ihost->mutex);
1981         spin_lock_irqsave(&session->lock, flags);
1982         if (session->target_state == ISCSI_SESSION_TARGET_ALLOCATED) {
1983                 remove_target = false;
1984         } else if (session->target_state != ISCSI_SESSION_TARGET_SCANNED) {
1985                 spin_unlock_irqrestore(&session->lock, flags);
1986                 mutex_unlock(&ihost->mutex);
1987                 ISCSI_DBG_TRANS_SESSION(session,
1988                         "Skipping target unbinding: Session is unbound/unbinding.\n");
1989                 return;
1990         }
1991
1992         session->target_state = ISCSI_SESSION_TARGET_UNBINDING;
1993         target_id = session->target_id;
1994         session->target_id = ISCSI_MAX_TARGET;
1995         spin_unlock_irqrestore(&session->lock, flags);
1996         mutex_unlock(&ihost->mutex);
1997
1998         if (remove_target)
1999                 scsi_remove_target(&session->dev);
2000
2001         if (session->ida_used)
2002                 ida_free(&iscsi_sess_ida, target_id);
2003
2004         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2005         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2006
2007         spin_lock_irqsave(&session->lock, flags);
2008         session->target_state = ISCSI_SESSION_TARGET_UNBOUND;
2009         spin_unlock_irqrestore(&session->lock, flags);
2010 }
2011
2012 static void __iscsi_destroy_session(struct work_struct *work)
2013 {
2014         struct iscsi_cls_session *session =
2015                 container_of(work, struct iscsi_cls_session, destroy_work);
2016
2017         session->transport->destroy_session(session);
2018 }
2019
2020 struct iscsi_cls_session *
2021 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2022                     int dd_size)
2023 {
2024         struct iscsi_cls_session *session;
2025
2026         session = kzalloc(sizeof(*session) + dd_size,
2027                           GFP_KERNEL);
2028         if (!session)
2029                 return NULL;
2030
2031         session->transport = transport;
2032         session->creator = -1;
2033         session->recovery_tmo = 120;
2034         session->recovery_tmo_sysfs_override = false;
2035         session->state = ISCSI_SESSION_FREE;
2036         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2037         INIT_LIST_HEAD(&session->sess_list);
2038         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2039         INIT_WORK(&session->block_work, __iscsi_block_session);
2040         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2041         INIT_WORK(&session->scan_work, iscsi_scan_session);
2042         INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2043         spin_lock_init(&session->lock);
2044
2045         /* this is released in the dev's release function */
2046         scsi_host_get(shost);
2047         session->dev.parent = &shost->shost_gendev;
2048         session->dev.release = iscsi_session_release;
2049         device_initialize(&session->dev);
2050         if (dd_size)
2051                 session->dd_data = &session[1];
2052
2053         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2054         return session;
2055 }
2056 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2057
2058 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2059 {
2060         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2061         unsigned long flags;
2062         int id = 0;
2063         int err;
2064
2065         session->sid = atomic_add_return(1, &iscsi_session_nr);
2066
2067         session->workq = alloc_workqueue("iscsi_ctrl_%d:%d",
2068                         WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
2069                         shost->host_no, session->sid);
2070         if (!session->workq)
2071                 return -ENOMEM;
2072
2073         if (target_id == ISCSI_MAX_TARGET) {
2074                 id = ida_alloc(&iscsi_sess_ida, GFP_KERNEL);
2075
2076                 if (id < 0) {
2077                         iscsi_cls_session_printk(KERN_ERR, session,
2078                                         "Failure in Target ID Allocation\n");
2079                         err = id;
2080                         goto destroy_wq;
2081                 }
2082                 session->target_id = (unsigned int)id;
2083                 session->ida_used = true;
2084         } else
2085                 session->target_id = target_id;
2086         spin_lock_irqsave(&session->lock, flags);
2087         session->target_state = ISCSI_SESSION_TARGET_ALLOCATED;
2088         spin_unlock_irqrestore(&session->lock, flags);
2089
2090         dev_set_name(&session->dev, "session%u", session->sid);
2091         err = device_add(&session->dev);
2092         if (err) {
2093                 iscsi_cls_session_printk(KERN_ERR, session,
2094                                          "could not register session's dev\n");
2095                 goto release_ida;
2096         }
2097         err = transport_register_device(&session->dev);
2098         if (err) {
2099                 iscsi_cls_session_printk(KERN_ERR, session,
2100                                          "could not register transport's dev\n");
2101                 goto release_dev;
2102         }
2103
2104         spin_lock_irqsave(&sesslock, flags);
2105         list_add(&session->sess_list, &sesslist);
2106         spin_unlock_irqrestore(&sesslock, flags);
2107
2108         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2109         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2110         return 0;
2111
2112 release_dev:
2113         device_del(&session->dev);
2114 release_ida:
2115         if (session->ida_used)
2116                 ida_free(&iscsi_sess_ida, session->target_id);
2117 destroy_wq:
2118         destroy_workqueue(session->workq);
2119         return err;
2120 }
2121 EXPORT_SYMBOL_GPL(iscsi_add_session);
2122
2123 /**
2124  * iscsi_create_session - create iscsi class session
2125  * @shost: scsi host
2126  * @transport: iscsi transport
2127  * @dd_size: private driver data size
2128  * @target_id: which target
2129  *
2130  * This can be called from a LLD or iscsi_transport.
2131  */
2132 struct iscsi_cls_session *
2133 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2134                      int dd_size, unsigned int target_id)
2135 {
2136         struct iscsi_cls_session *session;
2137
2138         session = iscsi_alloc_session(shost, transport, dd_size);
2139         if (!session)
2140                 return NULL;
2141
2142         if (iscsi_add_session(session, target_id)) {
2143                 iscsi_free_session(session);
2144                 return NULL;
2145         }
2146         return session;
2147 }
2148 EXPORT_SYMBOL_GPL(iscsi_create_session);
2149
2150 static void iscsi_conn_release(struct device *dev)
2151 {
2152         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2153         struct device *parent = conn->dev.parent;
2154
2155         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2156         kfree(conn);
2157         put_device(parent);
2158 }
2159
2160 static int iscsi_is_conn_dev(const struct device *dev)
2161 {
2162         return dev->release == iscsi_conn_release;
2163 }
2164
2165 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2166 {
2167         if (!iscsi_is_conn_dev(dev))
2168                 return 0;
2169
2170         iscsi_remove_conn(iscsi_dev_to_conn(dev));
2171         return 0;
2172 }
2173
2174 void iscsi_remove_session(struct iscsi_cls_session *session)
2175 {
2176         unsigned long flags;
2177         int err;
2178
2179         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2180
2181         spin_lock_irqsave(&sesslock, flags);
2182         if (!list_empty(&session->sess_list))
2183                 list_del(&session->sess_list);
2184         spin_unlock_irqrestore(&sesslock, flags);
2185
2186         if (!cancel_work_sync(&session->block_work))
2187                 cancel_delayed_work_sync(&session->recovery_work);
2188         cancel_work_sync(&session->unblock_work);
2189         /*
2190          * If we are blocked let commands flow again. The lld or iscsi
2191          * layer should set up the queuecommand to fail commands.
2192          * We assume that LLD will not be calling block/unblock while
2193          * removing the session.
2194          */
2195         spin_lock_irqsave(&session->lock, flags);
2196         session->state = ISCSI_SESSION_FREE;
2197         spin_unlock_irqrestore(&session->lock, flags);
2198
2199         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2200         /*
2201          * qla4xxx can perform it's own scans when it runs in kernel only
2202          * mode. Make sure to flush those scans.
2203          */
2204         flush_work(&session->scan_work);
2205         /* flush running unbind operations */
2206         flush_work(&session->unbind_work);
2207         __iscsi_unbind_session(&session->unbind_work);
2208
2209         /* hw iscsi may not have removed all connections from session */
2210         err = device_for_each_child(&session->dev, NULL,
2211                                     iscsi_iter_destroy_conn_fn);
2212         if (err)
2213                 iscsi_cls_session_printk(KERN_ERR, session,
2214                                          "Could not delete all connections "
2215                                          "for session. Error %d.\n", err);
2216
2217         transport_unregister_device(&session->dev);
2218
2219         destroy_workqueue(session->workq);
2220
2221         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2222         device_del(&session->dev);
2223 }
2224 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2225
2226 static void iscsi_stop_conn(struct iscsi_cls_conn *conn, int flag)
2227 {
2228         ISCSI_DBG_TRANS_CONN(conn, "Stopping conn.\n");
2229
2230         switch (flag) {
2231         case STOP_CONN_RECOVER:
2232                 WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2233                 break;
2234         case STOP_CONN_TERM:
2235                 WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2236                 break;
2237         default:
2238                 iscsi_cls_conn_printk(KERN_ERR, conn, "invalid stop flag %d\n",
2239                                       flag);
2240                 return;
2241         }
2242
2243         conn->transport->stop_conn(conn, flag);
2244         ISCSI_DBG_TRANS_CONN(conn, "Stopping conn done.\n");
2245 }
2246
2247 static void iscsi_ep_disconnect(struct iscsi_cls_conn *conn, bool is_active)
2248 {
2249         struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2250         struct iscsi_endpoint *ep;
2251
2252         ISCSI_DBG_TRANS_CONN(conn, "disconnect ep.\n");
2253         WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2254
2255         if (!conn->ep || !session->transport->ep_disconnect)
2256                 return;
2257
2258         ep = conn->ep;
2259         conn->ep = NULL;
2260
2261         session->transport->unbind_conn(conn, is_active);
2262         session->transport->ep_disconnect(ep);
2263         ISCSI_DBG_TRANS_CONN(conn, "disconnect ep done.\n");
2264 }
2265
2266 static void iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn *conn,
2267                                          struct iscsi_endpoint *ep,
2268                                          bool is_active)
2269 {
2270         /* Check if this was a conn error and the kernel took ownership */
2271         spin_lock_irq(&conn->lock);
2272         if (!test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2273                 spin_unlock_irq(&conn->lock);
2274                 iscsi_ep_disconnect(conn, is_active);
2275         } else {
2276                 spin_unlock_irq(&conn->lock);
2277                 ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
2278                 mutex_unlock(&conn->ep_mutex);
2279
2280                 flush_work(&conn->cleanup_work);
2281                 /*
2282                  * Userspace is now done with the EP so we can release the ref
2283                  * iscsi_cleanup_conn_work_fn took.
2284                  */
2285                 iscsi_put_endpoint(ep);
2286                 mutex_lock(&conn->ep_mutex);
2287         }
2288 }
2289
2290 static int iscsi_if_stop_conn(struct iscsi_cls_conn *conn, int flag)
2291 {
2292         ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop.\n");
2293         /*
2294          * For offload, iscsid may not know about the ep like when iscsid is
2295          * restarted or for kernel based session shutdown iscsid is not even
2296          * up. For these cases, we do the disconnect now.
2297          */
2298         mutex_lock(&conn->ep_mutex);
2299         if (conn->ep)
2300                 iscsi_if_disconnect_bound_ep(conn, conn->ep, true);
2301         mutex_unlock(&conn->ep_mutex);
2302
2303         /*
2304          * If this is a termination we have to call stop_conn with that flag
2305          * so the correct states get set. If we haven't run the work yet try to
2306          * avoid the extra run.
2307          */
2308         if (flag == STOP_CONN_TERM) {
2309                 cancel_work_sync(&conn->cleanup_work);
2310                 iscsi_stop_conn(conn, flag);
2311         } else {
2312                 /*
2313                  * Figure out if it was the kernel or userspace initiating this.
2314                  */
2315                 spin_lock_irq(&conn->lock);
2316                 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2317                         spin_unlock_irq(&conn->lock);
2318                         iscsi_stop_conn(conn, flag);
2319                 } else {
2320                         spin_unlock_irq(&conn->lock);
2321                         ISCSI_DBG_TRANS_CONN(conn,
2322                                              "flush kernel conn cleanup.\n");
2323                         flush_work(&conn->cleanup_work);
2324                 }
2325                 /*
2326                  * Only clear for recovery to avoid extra cleanup runs during
2327                  * termination.
2328                  */
2329                 spin_lock_irq(&conn->lock);
2330                 clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2331                 spin_unlock_irq(&conn->lock);
2332         }
2333         ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop done.\n");
2334         return 0;
2335 }
2336
2337 static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
2338 {
2339         struct iscsi_cls_conn *conn = container_of(work, struct iscsi_cls_conn,
2340                                                    cleanup_work);
2341         struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2342
2343         mutex_lock(&conn->ep_mutex);
2344         /*
2345          * Get a ref to the ep, so we don't release its ID until after
2346          * userspace is done referencing it in iscsi_if_disconnect_bound_ep.
2347          */
2348         if (conn->ep)
2349                 get_device(&conn->ep->dev);
2350         iscsi_ep_disconnect(conn, false);
2351
2352         if (system_state != SYSTEM_RUNNING) {
2353                 /*
2354                  * If the user has set up for the session to never timeout
2355                  * then hang like they wanted. For all other cases fail right
2356                  * away since userspace is not going to relogin.
2357                  */
2358                 if (session->recovery_tmo > 0)
2359                         session->recovery_tmo = 0;
2360         }
2361
2362         iscsi_stop_conn(conn, STOP_CONN_RECOVER);
2363         mutex_unlock(&conn->ep_mutex);
2364         ISCSI_DBG_TRANS_CONN(conn, "cleanup done.\n");
2365 }
2366
2367 static int iscsi_iter_force_destroy_conn_fn(struct device *dev, void *data)
2368 {
2369         struct iscsi_transport *transport;
2370         struct iscsi_cls_conn *conn;
2371
2372         if (!iscsi_is_conn_dev(dev))
2373                 return 0;
2374
2375         conn = iscsi_dev_to_conn(dev);
2376         transport = conn->transport;
2377
2378         if (READ_ONCE(conn->state) != ISCSI_CONN_DOWN)
2379                 iscsi_if_stop_conn(conn, STOP_CONN_TERM);
2380
2381         transport->destroy_conn(conn);
2382         return 0;
2383 }
2384
2385 /**
2386  * iscsi_force_destroy_session - destroy a session from the kernel
2387  * @session: session to destroy
2388  *
2389  * Force the destruction of a session from the kernel. This should only be
2390  * used when userspace is no longer running during system shutdown.
2391  */
2392 void iscsi_force_destroy_session(struct iscsi_cls_session *session)
2393 {
2394         struct iscsi_transport *transport = session->transport;
2395         unsigned long flags;
2396
2397         WARN_ON_ONCE(system_state == SYSTEM_RUNNING);
2398
2399         spin_lock_irqsave(&sesslock, flags);
2400         if (list_empty(&session->sess_list)) {
2401                 spin_unlock_irqrestore(&sesslock, flags);
2402                 /*
2403                  * Conn/ep is already freed. Session is being torn down via
2404                  * async path. For shutdown we don't care about it so return.
2405                  */
2406                 return;
2407         }
2408         spin_unlock_irqrestore(&sesslock, flags);
2409
2410         device_for_each_child(&session->dev, NULL,
2411                               iscsi_iter_force_destroy_conn_fn);
2412         transport->destroy_session(session);
2413 }
2414 EXPORT_SYMBOL_GPL(iscsi_force_destroy_session);
2415
2416 void iscsi_free_session(struct iscsi_cls_session *session)
2417 {
2418         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2419         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2420         put_device(&session->dev);
2421 }
2422 EXPORT_SYMBOL_GPL(iscsi_free_session);
2423
2424 /**
2425  * iscsi_alloc_conn - alloc iscsi class connection
2426  * @session: iscsi cls session
2427  * @dd_size: private driver data size
2428  * @cid: connection id
2429  */
2430 struct iscsi_cls_conn *
2431 iscsi_alloc_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2432 {
2433         struct iscsi_transport *transport = session->transport;
2434         struct iscsi_cls_conn *conn;
2435
2436         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2437         if (!conn)
2438                 return NULL;
2439         if (dd_size)
2440                 conn->dd_data = &conn[1];
2441
2442         mutex_init(&conn->ep_mutex);
2443         spin_lock_init(&conn->lock);
2444         INIT_LIST_HEAD(&conn->conn_list);
2445         INIT_WORK(&conn->cleanup_work, iscsi_cleanup_conn_work_fn);
2446         conn->transport = transport;
2447         conn->cid = cid;
2448         WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2449
2450         /* this is released in the dev's release function */
2451         if (!get_device(&session->dev))
2452                 goto free_conn;
2453
2454         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2455         device_initialize(&conn->dev);
2456         conn->dev.parent = &session->dev;
2457         conn->dev.release = iscsi_conn_release;
2458
2459         return conn;
2460
2461 free_conn:
2462         kfree(conn);
2463         return NULL;
2464 }
2465 EXPORT_SYMBOL_GPL(iscsi_alloc_conn);
2466
2467 /**
2468  * iscsi_add_conn - add iscsi class connection
2469  * @conn: iscsi cls connection
2470  *
2471  * This will expose iscsi_cls_conn to sysfs so make sure the related
2472  * resources for sysfs attributes are initialized before calling this.
2473  */
2474 int iscsi_add_conn(struct iscsi_cls_conn *conn)
2475 {
2476         int err;
2477         unsigned long flags;
2478         struct iscsi_cls_session *session = iscsi_dev_to_session(conn->dev.parent);
2479
2480         err = device_add(&conn->dev);
2481         if (err) {
2482                 iscsi_cls_session_printk(KERN_ERR, session,
2483                                          "could not register connection's dev\n");
2484                 return err;
2485         }
2486         err = transport_register_device(&conn->dev);
2487         if (err) {
2488                 iscsi_cls_session_printk(KERN_ERR, session,
2489                                          "could not register transport's dev\n");
2490                 device_del(&conn->dev);
2491                 return err;
2492         }
2493
2494         spin_lock_irqsave(&connlock, flags);
2495         list_add(&conn->conn_list, &connlist);
2496         spin_unlock_irqrestore(&connlock, flags);
2497
2498         return 0;
2499 }
2500 EXPORT_SYMBOL_GPL(iscsi_add_conn);
2501
2502 /**
2503  * iscsi_remove_conn - remove iscsi class connection from sysfs
2504  * @conn: iscsi cls connection
2505  *
2506  * Remove iscsi_cls_conn from sysfs, and wait for previous
2507  * read/write of iscsi_cls_conn's attributes in sysfs to finish.
2508  */
2509 void iscsi_remove_conn(struct iscsi_cls_conn *conn)
2510 {
2511         unsigned long flags;
2512
2513         spin_lock_irqsave(&connlock, flags);
2514         list_del(&conn->conn_list);
2515         spin_unlock_irqrestore(&connlock, flags);
2516
2517         transport_unregister_device(&conn->dev);
2518         device_del(&conn->dev);
2519 }
2520 EXPORT_SYMBOL_GPL(iscsi_remove_conn);
2521
2522 void iscsi_put_conn(struct iscsi_cls_conn *conn)
2523 {
2524         put_device(&conn->dev);
2525 }
2526 EXPORT_SYMBOL_GPL(iscsi_put_conn);
2527
2528 void iscsi_get_conn(struct iscsi_cls_conn *conn)
2529 {
2530         get_device(&conn->dev);
2531 }
2532 EXPORT_SYMBOL_GPL(iscsi_get_conn);
2533
2534 /*
2535  * iscsi interface functions
2536  */
2537 static struct iscsi_internal *
2538 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2539 {
2540         struct iscsi_internal *priv;
2541         unsigned long flags;
2542
2543         spin_lock_irqsave(&iscsi_transport_lock, flags);
2544         list_for_each_entry(priv, &iscsi_transports, list) {
2545                 if (tt == priv->iscsi_transport) {
2546                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2547                         return priv;
2548                 }
2549         }
2550         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2551         return NULL;
2552 }
2553
2554 static int
2555 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2556 {
2557         return nlmsg_multicast(nls, skb, 0, group, gfp);
2558 }
2559
2560 static int
2561 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2562 {
2563         return nlmsg_unicast(nls, skb, portid);
2564 }
2565
2566 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2567                    char *data, uint32_t data_size)
2568 {
2569         struct nlmsghdr *nlh;
2570         struct sk_buff *skb;
2571         struct iscsi_uevent *ev;
2572         char *pdu;
2573         struct iscsi_internal *priv;
2574         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2575                                    data_size);
2576
2577         priv = iscsi_if_transport_lookup(conn->transport);
2578         if (!priv)
2579                 return -EINVAL;
2580
2581         skb = alloc_skb(len, GFP_ATOMIC);
2582         if (!skb) {
2583                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2584                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2585                                       "control PDU: OOM\n");
2586                 return -ENOMEM;
2587         }
2588
2589         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2590         ev = nlmsg_data(nlh);
2591         memset(ev, 0, sizeof(*ev));
2592         ev->transport_handle = iscsi_handle(conn->transport);
2593         ev->type = ISCSI_KEVENT_RECV_PDU;
2594         ev->r.recv_req.cid = conn->cid;
2595         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2596         pdu = (char*)ev + sizeof(*ev);
2597         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2598         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2599
2600         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2601 }
2602 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2603
2604 int iscsi_offload_mesg(struct Scsi_Host *shost,
2605                        struct iscsi_transport *transport, uint32_t type,
2606                        char *data, uint16_t data_size)
2607 {
2608         struct nlmsghdr *nlh;
2609         struct sk_buff *skb;
2610         struct iscsi_uevent *ev;
2611         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2612
2613         skb = alloc_skb(len, GFP_ATOMIC);
2614         if (!skb) {
2615                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2616                 return -ENOMEM;
2617         }
2618
2619         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2620         ev = nlmsg_data(nlh);
2621         memset(ev, 0, sizeof(*ev));
2622         ev->type = type;
2623         ev->transport_handle = iscsi_handle(transport);
2624         switch (type) {
2625         case ISCSI_KEVENT_PATH_REQ:
2626                 ev->r.req_path.host_no = shost->host_no;
2627                 break;
2628         case ISCSI_KEVENT_IF_DOWN:
2629                 ev->r.notify_if_down.host_no = shost->host_no;
2630                 break;
2631         }
2632
2633         memcpy((char *)ev + sizeof(*ev), data, data_size);
2634
2635         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2636 }
2637 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2638
2639 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2640 {
2641         struct nlmsghdr *nlh;
2642         struct sk_buff  *skb;
2643         struct iscsi_uevent *ev;
2644         struct iscsi_internal *priv;
2645         int len = nlmsg_total_size(sizeof(*ev));
2646         unsigned long flags;
2647         int state;
2648
2649         spin_lock_irqsave(&conn->lock, flags);
2650         /*
2651          * Userspace will only do a stop call if we are at least bound. And, we
2652          * only need to do the in kernel cleanup if in the UP state so cmds can
2653          * be released to upper layers. If in other states just wait for
2654          * userspace to avoid races that can leave the cleanup_work queued.
2655          */
2656         state = READ_ONCE(conn->state);
2657         switch (state) {
2658         case ISCSI_CONN_BOUND:
2659         case ISCSI_CONN_UP:
2660                 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP,
2661                                       &conn->flags)) {
2662                         queue_work(iscsi_conn_cleanup_workq,
2663                                    &conn->cleanup_work);
2664                 }
2665                 break;
2666         default:
2667                 ISCSI_DBG_TRANS_CONN(conn, "Got conn error in state %d\n",
2668                                      state);
2669                 break;
2670         }
2671         spin_unlock_irqrestore(&conn->lock, flags);
2672
2673         priv = iscsi_if_transport_lookup(conn->transport);
2674         if (!priv)
2675                 return;
2676
2677         skb = alloc_skb(len, GFP_ATOMIC);
2678         if (!skb) {
2679                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2680                                       "conn error (%d)\n", error);
2681                 return;
2682         }
2683
2684         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2685         ev = nlmsg_data(nlh);
2686         ev->transport_handle = iscsi_handle(conn->transport);
2687         ev->type = ISCSI_KEVENT_CONN_ERROR;
2688         ev->r.connerror.error = error;
2689         ev->r.connerror.cid = conn->cid;
2690         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2691
2692         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2693
2694         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2695                               error);
2696 }
2697 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2698
2699 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2700                             enum iscsi_conn_state state)
2701 {
2702         struct nlmsghdr *nlh;
2703         struct sk_buff  *skb;
2704         struct iscsi_uevent *ev;
2705         struct iscsi_internal *priv;
2706         int len = nlmsg_total_size(sizeof(*ev));
2707
2708         priv = iscsi_if_transport_lookup(conn->transport);
2709         if (!priv)
2710                 return;
2711
2712         skb = alloc_skb(len, GFP_ATOMIC);
2713         if (!skb) {
2714                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2715                                       "conn login (%d)\n", state);
2716                 return;
2717         }
2718
2719         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2720         ev = nlmsg_data(nlh);
2721         ev->transport_handle = iscsi_handle(conn->transport);
2722         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2723         ev->r.conn_login.state = state;
2724         ev->r.conn_login.cid = conn->cid;
2725         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2726         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2727
2728         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2729                               state);
2730 }
2731 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2732
2733 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2734                            enum iscsi_host_event_code code, uint32_t data_size,
2735                            uint8_t *data)
2736 {
2737         struct nlmsghdr *nlh;
2738         struct sk_buff *skb;
2739         struct iscsi_uevent *ev;
2740         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2741
2742         skb = alloc_skb(len, GFP_NOIO);
2743         if (!skb) {
2744                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2745                        host_no, code);
2746                 return;
2747         }
2748
2749         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2750         ev = nlmsg_data(nlh);
2751         ev->transport_handle = iscsi_handle(transport);
2752         ev->type = ISCSI_KEVENT_HOST_EVENT;
2753         ev->r.host_event.host_no = host_no;
2754         ev->r.host_event.code = code;
2755         ev->r.host_event.data_size = data_size;
2756
2757         if (data_size)
2758                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2759
2760         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2761 }
2762 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2763
2764 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2765                            uint32_t status, uint32_t pid, uint32_t data_size,
2766                            uint8_t *data)
2767 {
2768         struct nlmsghdr *nlh;
2769         struct sk_buff *skb;
2770         struct iscsi_uevent *ev;
2771         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2772
2773         skb = alloc_skb(len, GFP_NOIO);
2774         if (!skb) {
2775                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2776                 return;
2777         }
2778
2779         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2780         ev = nlmsg_data(nlh);
2781         ev->transport_handle = iscsi_handle(transport);
2782         ev->type = ISCSI_KEVENT_PING_COMP;
2783         ev->r.ping_comp.host_no = host_no;
2784         ev->r.ping_comp.status = status;
2785         ev->r.ping_comp.pid = pid;
2786         ev->r.ping_comp.data_size = data_size;
2787         memcpy((char *)ev + sizeof(*ev), data, data_size);
2788
2789         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2790 }
2791 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2792
2793 static int
2794 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2795 {
2796         struct sk_buff  *skb;
2797         struct nlmsghdr *nlh;
2798         int len = nlmsg_total_size(size);
2799
2800         skb = alloc_skb(len, GFP_ATOMIC);
2801         if (!skb) {
2802                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2803                 return -ENOMEM;
2804         }
2805
2806         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2807         memcpy(nlmsg_data(nlh), payload, size);
2808         return iscsi_unicast_skb(skb, portid);
2809 }
2810
2811 static int
2812 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2813 {
2814         struct iscsi_uevent *ev = nlmsg_data(nlh);
2815         struct iscsi_stats *stats;
2816         struct sk_buff *skbstat;
2817         struct iscsi_cls_conn *conn;
2818         struct nlmsghdr *nlhstat;
2819         struct iscsi_uevent *evstat;
2820         struct iscsi_internal *priv;
2821         int len = nlmsg_total_size(sizeof(*ev) +
2822                                    sizeof(struct iscsi_stats) +
2823                                    sizeof(struct iscsi_stats_custom) *
2824                                    ISCSI_STATS_CUSTOM_MAX);
2825         int err = 0;
2826
2827         priv = iscsi_if_transport_lookup(transport);
2828         if (!priv)
2829                 return -EINVAL;
2830
2831         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2832         if (!conn)
2833                 return -EEXIST;
2834
2835         do {
2836                 int actual_size;
2837
2838                 skbstat = alloc_skb(len, GFP_ATOMIC);
2839                 if (!skbstat) {
2840                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2841                                               "deliver stats: OOM\n");
2842                         return -ENOMEM;
2843                 }
2844
2845                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2846                                       (len - sizeof(*nlhstat)), 0);
2847                 evstat = nlmsg_data(nlhstat);
2848                 memset(evstat, 0, sizeof(*evstat));
2849                 evstat->transport_handle = iscsi_handle(conn->transport);
2850                 evstat->type = nlh->nlmsg_type;
2851                 evstat->u.get_stats.cid =
2852                         ev->u.get_stats.cid;
2853                 evstat->u.get_stats.sid =
2854                         ev->u.get_stats.sid;
2855                 stats = (struct iscsi_stats *)
2856                         ((char*)evstat + sizeof(*evstat));
2857                 memset(stats, 0, sizeof(*stats));
2858
2859                 transport->get_stats(conn, stats);
2860                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2861                                                sizeof(struct iscsi_stats) +
2862                                                sizeof(struct iscsi_stats_custom) *
2863                                                stats->custom_length);
2864                 actual_size -= sizeof(*nlhstat);
2865                 actual_size = nlmsg_msg_size(actual_size);
2866                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2867                 nlhstat->nlmsg_len = actual_size;
2868
2869                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2870                                           GFP_ATOMIC);
2871         } while (err < 0 && err != -ECONNREFUSED);
2872
2873         return err;
2874 }
2875
2876 /**
2877  * iscsi_session_event - send session destr. completion event
2878  * @session: iscsi class session
2879  * @event: type of event
2880  */
2881 int iscsi_session_event(struct iscsi_cls_session *session,
2882                         enum iscsi_uevent_e event)
2883 {
2884         struct iscsi_internal *priv;
2885         struct Scsi_Host *shost;
2886         struct iscsi_uevent *ev;
2887         struct sk_buff  *skb;
2888         struct nlmsghdr *nlh;
2889         int rc, len = nlmsg_total_size(sizeof(*ev));
2890
2891         priv = iscsi_if_transport_lookup(session->transport);
2892         if (!priv)
2893                 return -EINVAL;
2894         shost = iscsi_session_to_shost(session);
2895
2896         skb = alloc_skb(len, GFP_KERNEL);
2897         if (!skb) {
2898                 iscsi_cls_session_printk(KERN_ERR, session,
2899                                          "Cannot notify userspace of session "
2900                                          "event %u\n", event);
2901                 return -ENOMEM;
2902         }
2903
2904         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2905         ev = nlmsg_data(nlh);
2906         ev->transport_handle = iscsi_handle(session->transport);
2907
2908         ev->type = event;
2909         switch (event) {
2910         case ISCSI_KEVENT_DESTROY_SESSION:
2911                 ev->r.d_session.host_no = shost->host_no;
2912                 ev->r.d_session.sid = session->sid;
2913                 break;
2914         case ISCSI_KEVENT_CREATE_SESSION:
2915                 ev->r.c_session_ret.host_no = shost->host_no;
2916                 ev->r.c_session_ret.sid = session->sid;
2917                 break;
2918         case ISCSI_KEVENT_UNBIND_SESSION:
2919                 ev->r.unbind_session.host_no = shost->host_no;
2920                 ev->r.unbind_session.sid = session->sid;
2921                 break;
2922         default:
2923                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2924                                          "%u.\n", event);
2925                 kfree_skb(skb);
2926                 return -EINVAL;
2927         }
2928
2929         /*
2930          * this will occur if the daemon is not up, so we just warn
2931          * the user and when the daemon is restarted it will handle it
2932          */
2933         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2934         if (rc == -ESRCH)
2935                 iscsi_cls_session_printk(KERN_ERR, session,
2936                                          "Cannot notify userspace of session "
2937                                          "event %u. Check iscsi daemon\n",
2938                                          event);
2939
2940         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2941                                 event, rc);
2942         return rc;
2943 }
2944 EXPORT_SYMBOL_GPL(iscsi_session_event);
2945
2946 static int
2947 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2948                         struct iscsi_uevent *ev, pid_t pid,
2949                         uint32_t initial_cmdsn, uint16_t cmds_max,
2950                         uint16_t queue_depth)
2951 {
2952         struct iscsi_transport *transport = priv->iscsi_transport;
2953         struct iscsi_cls_session *session;
2954         struct Scsi_Host *shost;
2955
2956         session = transport->create_session(ep, cmds_max, queue_depth,
2957                                             initial_cmdsn);
2958         if (!session)
2959                 return -ENOMEM;
2960
2961         session->creator = pid;
2962         shost = iscsi_session_to_shost(session);
2963         ev->r.c_session_ret.host_no = shost->host_no;
2964         ev->r.c_session_ret.sid = session->sid;
2965         ISCSI_DBG_TRANS_SESSION(session,
2966                                 "Completed creating transport session\n");
2967         return 0;
2968 }
2969
2970 static int
2971 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2972 {
2973         struct iscsi_cls_conn *conn;
2974         struct iscsi_cls_session *session;
2975
2976         session = iscsi_session_lookup(ev->u.c_conn.sid);
2977         if (!session) {
2978                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2979                        ev->u.c_conn.sid);
2980                 return -EINVAL;
2981         }
2982
2983         conn = transport->create_conn(session, ev->u.c_conn.cid);
2984         if (!conn) {
2985                 iscsi_cls_session_printk(KERN_ERR, session,
2986                                          "couldn't create a new connection.");
2987                 return -ENOMEM;
2988         }
2989
2990         ev->r.c_conn_ret.sid = session->sid;
2991         ev->r.c_conn_ret.cid = conn->cid;
2992
2993         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2994         return 0;
2995 }
2996
2997 static int
2998 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2999 {
3000         struct iscsi_cls_conn *conn;
3001
3002         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
3003         if (!conn)
3004                 return -EINVAL;
3005
3006         ISCSI_DBG_TRANS_CONN(conn, "Flushing cleanup during destruction\n");
3007         flush_work(&conn->cleanup_work);
3008         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
3009
3010         if (transport->destroy_conn)
3011                 transport->destroy_conn(conn);
3012         return 0;
3013 }
3014
3015 static int
3016 iscsi_if_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3017 {
3018         char *data = (char*)ev + sizeof(*ev);
3019         struct iscsi_cls_conn *conn;
3020         struct iscsi_cls_session *session;
3021         int err = 0, value = 0, state;
3022
3023         if (ev->u.set_param.len > PAGE_SIZE)
3024                 return -EINVAL;
3025
3026         session = iscsi_session_lookup(ev->u.set_param.sid);
3027         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
3028         if (!conn || !session)
3029                 return -EINVAL;
3030
3031         switch (ev->u.set_param.param) {
3032         case ISCSI_PARAM_SESS_RECOVERY_TMO:
3033                 sscanf(data, "%d", &value);
3034                 if (!session->recovery_tmo_sysfs_override)
3035                         session->recovery_tmo = value;
3036                 break;
3037         default:
3038                 state = READ_ONCE(conn->state);
3039                 if (state == ISCSI_CONN_BOUND || state == ISCSI_CONN_UP) {
3040                         err = transport->set_param(conn, ev->u.set_param.param,
3041                                         data, ev->u.set_param.len);
3042                 } else {
3043                         return -ENOTCONN;
3044                 }
3045         }
3046
3047         return err;
3048 }
3049
3050 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
3051                                struct iscsi_uevent *ev, int msg_type)
3052 {
3053         struct iscsi_endpoint *ep;
3054         struct sockaddr *dst_addr;
3055         struct Scsi_Host *shost = NULL;
3056         int non_blocking, err = 0;
3057
3058         if (!transport->ep_connect)
3059                 return -EINVAL;
3060
3061         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
3062                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
3063                 if (!shost) {
3064                         printk(KERN_ERR "ep connect failed. Could not find "
3065                                "host no %u\n",
3066                                ev->u.ep_connect_through_host.host_no);
3067                         return -ENODEV;
3068                 }
3069                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
3070         } else
3071                 non_blocking = ev->u.ep_connect.non_blocking;
3072
3073         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3074         ep = transport->ep_connect(shost, dst_addr, non_blocking);
3075         if (IS_ERR(ep)) {
3076                 err = PTR_ERR(ep);
3077                 goto release_host;
3078         }
3079
3080         ev->r.ep_connect_ret.handle = ep->id;
3081 release_host:
3082         if (shost)
3083                 scsi_host_put(shost);
3084         return err;
3085 }
3086
3087 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
3088                                   u64 ep_handle)
3089 {
3090         struct iscsi_cls_conn *conn;
3091         struct iscsi_endpoint *ep;
3092
3093         if (!transport->ep_disconnect)
3094                 return -EINVAL;
3095
3096         ep = iscsi_lookup_endpoint(ep_handle);
3097         if (!ep)
3098                 return -EINVAL;
3099
3100         conn = ep->conn;
3101         if (!conn) {
3102                 /*
3103                  * conn was not even bound yet, so we can't get iscsi conn
3104                  * failures yet.
3105                  */
3106                 transport->ep_disconnect(ep);
3107                 goto put_ep;
3108         }
3109
3110         mutex_lock(&conn->ep_mutex);
3111         iscsi_if_disconnect_bound_ep(conn, ep, false);
3112         mutex_unlock(&conn->ep_mutex);
3113 put_ep:
3114         iscsi_put_endpoint(ep);
3115         return 0;
3116 }
3117
3118 static int
3119 iscsi_if_transport_ep(struct iscsi_transport *transport,
3120                       struct iscsi_uevent *ev, int msg_type)
3121 {
3122         struct iscsi_endpoint *ep;
3123         int rc = 0;
3124
3125         switch (msg_type) {
3126         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3127         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3128                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
3129                 break;
3130         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3131                 if (!transport->ep_poll)
3132                         return -EINVAL;
3133
3134                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
3135                 if (!ep)
3136                         return -EINVAL;
3137
3138                 ev->r.retcode = transport->ep_poll(ep,
3139                                                    ev->u.ep_poll.timeout_ms);
3140                 iscsi_put_endpoint(ep);
3141                 break;
3142         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3143                 rc = iscsi_if_ep_disconnect(transport,
3144                                             ev->u.ep_disconnect.ep_handle);
3145                 break;
3146         }
3147         return rc;
3148 }
3149
3150 static int
3151 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3152                 struct iscsi_uevent *ev)
3153 {
3154         struct Scsi_Host *shost;
3155         struct sockaddr *dst_addr;
3156         int err;
3157
3158         if (!transport->tgt_dscvr)
3159                 return -EINVAL;
3160
3161         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3162         if (!shost) {
3163                 printk(KERN_ERR "target discovery could not find host no %u\n",
3164                        ev->u.tgt_dscvr.host_no);
3165                 return -ENODEV;
3166         }
3167
3168
3169         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3170         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3171                                    ev->u.tgt_dscvr.enable, dst_addr);
3172         scsi_host_put(shost);
3173         return err;
3174 }
3175
3176 static int
3177 iscsi_set_host_param(struct iscsi_transport *transport,
3178                      struct iscsi_uevent *ev)
3179 {
3180         char *data = (char*)ev + sizeof(*ev);
3181         struct Scsi_Host *shost;
3182         int err;
3183
3184         if (!transport->set_host_param)
3185                 return -ENOSYS;
3186
3187         if (ev->u.set_host_param.len > PAGE_SIZE)
3188                 return -EINVAL;
3189
3190         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3191         if (!shost) {
3192                 printk(KERN_ERR "set_host_param could not find host no %u\n",
3193                        ev->u.set_host_param.host_no);
3194                 return -ENODEV;
3195         }
3196
3197         err = transport->set_host_param(shost, ev->u.set_host_param.param,
3198                                         data, ev->u.set_host_param.len);
3199         scsi_host_put(shost);
3200         return err;
3201 }
3202
3203 static int
3204 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3205 {
3206         struct Scsi_Host *shost;
3207         struct iscsi_path *params;
3208         int err;
3209
3210         if (!transport->set_path)
3211                 return -ENOSYS;
3212
3213         shost = scsi_host_lookup(ev->u.set_path.host_no);
3214         if (!shost) {
3215                 printk(KERN_ERR "set path could not find host no %u\n",
3216                        ev->u.set_path.host_no);
3217                 return -ENODEV;
3218         }
3219
3220         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3221         err = transport->set_path(shost, params);
3222
3223         scsi_host_put(shost);
3224         return err;
3225 }
3226
3227 static int iscsi_session_has_conns(int sid)
3228 {
3229         struct iscsi_cls_conn *conn;
3230         unsigned long flags;
3231         int found = 0;
3232
3233         spin_lock_irqsave(&connlock, flags);
3234         list_for_each_entry(conn, &connlist, conn_list) {
3235                 if (iscsi_conn_get_sid(conn) == sid) {
3236                         found = 1;
3237                         break;
3238                 }
3239         }
3240         spin_unlock_irqrestore(&connlock, flags);
3241
3242         return found;
3243 }
3244
3245 static int
3246 iscsi_set_iface_params(struct iscsi_transport *transport,
3247                        struct iscsi_uevent *ev, uint32_t len)
3248 {
3249         char *data = (char *)ev + sizeof(*ev);
3250         struct Scsi_Host *shost;
3251         int err;
3252
3253         if (!transport->set_iface_param)
3254                 return -ENOSYS;
3255
3256         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3257         if (!shost) {
3258                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
3259                        ev->u.set_iface_params.host_no);
3260                 return -ENODEV;
3261         }
3262
3263         err = transport->set_iface_param(shost, data, len);
3264         scsi_host_put(shost);
3265         return err;
3266 }
3267
3268 static int
3269 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3270 {
3271         struct Scsi_Host *shost;
3272         struct sockaddr *dst_addr;
3273         int err;
3274
3275         if (!transport->send_ping)
3276                 return -ENOSYS;
3277
3278         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3279         if (!shost) {
3280                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3281                        ev->u.iscsi_ping.host_no);
3282                 return -ENODEV;
3283         }
3284
3285         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3286         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3287                                    ev->u.iscsi_ping.iface_type,
3288                                    ev->u.iscsi_ping.payload_size,
3289                                    ev->u.iscsi_ping.pid,
3290                                    dst_addr);
3291         scsi_host_put(shost);
3292         return err;
3293 }
3294
3295 static int
3296 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3297 {
3298         struct iscsi_uevent *ev = nlmsg_data(nlh);
3299         struct Scsi_Host *shost = NULL;
3300         struct iscsi_chap_rec *chap_rec;
3301         struct iscsi_internal *priv;
3302         struct sk_buff *skbchap;
3303         struct nlmsghdr *nlhchap;
3304         struct iscsi_uevent *evchap;
3305         uint32_t chap_buf_size;
3306         int len, err = 0;
3307         char *buf;
3308
3309         if (!transport->get_chap)
3310                 return -EINVAL;
3311
3312         priv = iscsi_if_transport_lookup(transport);
3313         if (!priv)
3314                 return -EINVAL;
3315
3316         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3317         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3318
3319         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3320         if (!shost) {
3321                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3322                        __func__, ev->u.get_chap.host_no);
3323                 return -ENODEV;
3324         }
3325
3326         do {
3327                 int actual_size;
3328
3329                 skbchap = alloc_skb(len, GFP_KERNEL);
3330                 if (!skbchap) {
3331                         printk(KERN_ERR "can not deliver chap: OOM\n");
3332                         err = -ENOMEM;
3333                         goto exit_get_chap;
3334                 }
3335
3336                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3337                                       (len - sizeof(*nlhchap)), 0);
3338                 evchap = nlmsg_data(nlhchap);
3339                 memset(evchap, 0, sizeof(*evchap));
3340                 evchap->transport_handle = iscsi_handle(transport);
3341                 evchap->type = nlh->nlmsg_type;
3342                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3343                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3344                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3345                 buf = (char *)evchap + sizeof(*evchap);
3346                 memset(buf, 0, chap_buf_size);
3347
3348                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3349                                     &evchap->u.get_chap.num_entries, buf);
3350
3351                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3352                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3353                 nlhchap->nlmsg_len = actual_size;
3354
3355                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3356                                           GFP_KERNEL);
3357         } while (err < 0 && err != -ECONNREFUSED);
3358
3359 exit_get_chap:
3360         scsi_host_put(shost);
3361         return err;
3362 }
3363
3364 static int iscsi_set_chap(struct iscsi_transport *transport,
3365                           struct iscsi_uevent *ev, uint32_t len)
3366 {
3367         char *data = (char *)ev + sizeof(*ev);
3368         struct Scsi_Host *shost;
3369         int err = 0;
3370
3371         if (!transport->set_chap)
3372                 return -ENOSYS;
3373
3374         shost = scsi_host_lookup(ev->u.set_path.host_no);
3375         if (!shost) {
3376                 pr_err("%s could not find host no %u\n",
3377                        __func__, ev->u.set_path.host_no);
3378                 return -ENODEV;
3379         }
3380
3381         err = transport->set_chap(shost, data, len);
3382         scsi_host_put(shost);
3383         return err;
3384 }
3385
3386 static int iscsi_delete_chap(struct iscsi_transport *transport,
3387                              struct iscsi_uevent *ev)
3388 {
3389         struct Scsi_Host *shost;
3390         int err = 0;
3391
3392         if (!transport->delete_chap)
3393                 return -ENOSYS;
3394
3395         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3396         if (!shost) {
3397                 printk(KERN_ERR "%s could not find host no %u\n",
3398                        __func__, ev->u.delete_chap.host_no);
3399                 return -ENODEV;
3400         }
3401
3402         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3403         scsi_host_put(shost);
3404         return err;
3405 }
3406
3407 static const struct {
3408         enum iscsi_discovery_parent_type value;
3409         char                            *name;
3410 } iscsi_discovery_parent_names[] = {
3411         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3412         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3413         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3414 };
3415
3416 char *iscsi_get_discovery_parent_name(int parent_type)
3417 {
3418         int i;
3419         char *state = "Unknown!";
3420
3421         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3422                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3423                         state = iscsi_discovery_parent_names[i].name;
3424                         break;
3425                 }
3426         }
3427         return state;
3428 }
3429 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3430
3431 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3432                                      struct iscsi_uevent *ev, uint32_t len)
3433 {
3434         char *data = (char *)ev + sizeof(*ev);
3435         struct Scsi_Host *shost;
3436         struct iscsi_bus_flash_session *fnode_sess;
3437         struct iscsi_bus_flash_conn *fnode_conn;
3438         struct device *dev;
3439         uint32_t idx;
3440         int err = 0;
3441
3442         if (!transport->set_flashnode_param) {
3443                 err = -ENOSYS;
3444                 goto exit_set_fnode;
3445         }
3446
3447         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3448         if (!shost) {
3449                 pr_err("%s could not find host no %u\n",
3450                        __func__, ev->u.set_flashnode.host_no);
3451                 err = -ENODEV;
3452                 goto exit_set_fnode;
3453         }
3454
3455         idx = ev->u.set_flashnode.flashnode_idx;
3456         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3457         if (!fnode_sess) {
3458                 pr_err("%s could not find flashnode %u for host no %u\n",
3459                        __func__, idx, ev->u.set_flashnode.host_no);
3460                 err = -ENODEV;
3461                 goto put_host;
3462         }
3463
3464         dev = iscsi_find_flashnode_conn(fnode_sess);
3465         if (!dev) {
3466                 err = -ENODEV;
3467                 goto put_sess;
3468         }
3469
3470         fnode_conn = iscsi_dev_to_flash_conn(dev);
3471         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3472         put_device(dev);
3473
3474 put_sess:
3475         put_device(&fnode_sess->dev);
3476
3477 put_host:
3478         scsi_host_put(shost);
3479
3480 exit_set_fnode:
3481         return err;
3482 }
3483
3484 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3485                                struct iscsi_uevent *ev, uint32_t len)
3486 {
3487         char *data = (char *)ev + sizeof(*ev);
3488         struct Scsi_Host *shost;
3489         int index;
3490         int err = 0;
3491
3492         if (!transport->new_flashnode) {
3493                 err = -ENOSYS;
3494                 goto exit_new_fnode;
3495         }
3496
3497         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3498         if (!shost) {
3499                 pr_err("%s could not find host no %u\n",
3500                        __func__, ev->u.new_flashnode.host_no);
3501                 err = -ENODEV;
3502                 goto put_host;
3503         }
3504
3505         index = transport->new_flashnode(shost, data, len);
3506
3507         if (index >= 0)
3508                 ev->r.new_flashnode_ret.flashnode_idx = index;
3509         else
3510                 err = -EIO;
3511
3512 put_host:
3513         scsi_host_put(shost);
3514
3515 exit_new_fnode:
3516         return err;
3517 }
3518
3519 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3520                                struct iscsi_uevent *ev)
3521 {
3522         struct Scsi_Host *shost;
3523         struct iscsi_bus_flash_session *fnode_sess;
3524         uint32_t idx;
3525         int err = 0;
3526
3527         if (!transport->del_flashnode) {
3528                 err = -ENOSYS;
3529                 goto exit_del_fnode;
3530         }
3531
3532         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3533         if (!shost) {
3534                 pr_err("%s could not find host no %u\n",
3535                        __func__, ev->u.del_flashnode.host_no);
3536                 err = -ENODEV;
3537                 goto put_host;
3538         }
3539
3540         idx = ev->u.del_flashnode.flashnode_idx;
3541         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3542         if (!fnode_sess) {
3543                 pr_err("%s could not find flashnode %u for host no %u\n",
3544                        __func__, idx, ev->u.del_flashnode.host_no);
3545                 err = -ENODEV;
3546                 goto put_host;
3547         }
3548
3549         err = transport->del_flashnode(fnode_sess);
3550         put_device(&fnode_sess->dev);
3551
3552 put_host:
3553         scsi_host_put(shost);
3554
3555 exit_del_fnode:
3556         return err;
3557 }
3558
3559 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3560                                  struct iscsi_uevent *ev)
3561 {
3562         struct Scsi_Host *shost;
3563         struct iscsi_bus_flash_session *fnode_sess;
3564         struct iscsi_bus_flash_conn *fnode_conn;
3565         struct device *dev;
3566         uint32_t idx;
3567         int err = 0;
3568
3569         if (!transport->login_flashnode) {
3570                 err = -ENOSYS;
3571                 goto exit_login_fnode;
3572         }
3573
3574         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3575         if (!shost) {
3576                 pr_err("%s could not find host no %u\n",
3577                        __func__, ev->u.login_flashnode.host_no);
3578                 err = -ENODEV;
3579                 goto put_host;
3580         }
3581
3582         idx = ev->u.login_flashnode.flashnode_idx;
3583         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3584         if (!fnode_sess) {
3585                 pr_err("%s could not find flashnode %u for host no %u\n",
3586                        __func__, idx, ev->u.login_flashnode.host_no);
3587                 err = -ENODEV;
3588                 goto put_host;
3589         }
3590
3591         dev = iscsi_find_flashnode_conn(fnode_sess);
3592         if (!dev) {
3593                 err = -ENODEV;
3594                 goto put_sess;
3595         }
3596
3597         fnode_conn = iscsi_dev_to_flash_conn(dev);
3598         err = transport->login_flashnode(fnode_sess, fnode_conn);
3599         put_device(dev);
3600
3601 put_sess:
3602         put_device(&fnode_sess->dev);
3603
3604 put_host:
3605         scsi_host_put(shost);
3606
3607 exit_login_fnode:
3608         return err;
3609 }
3610
3611 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3612                                   struct iscsi_uevent *ev)
3613 {
3614         struct Scsi_Host *shost;
3615         struct iscsi_bus_flash_session *fnode_sess;
3616         struct iscsi_bus_flash_conn *fnode_conn;
3617         struct device *dev;
3618         uint32_t idx;
3619         int err = 0;
3620
3621         if (!transport->logout_flashnode) {
3622                 err = -ENOSYS;
3623                 goto exit_logout_fnode;
3624         }
3625
3626         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3627         if (!shost) {
3628                 pr_err("%s could not find host no %u\n",
3629                        __func__, ev->u.logout_flashnode.host_no);
3630                 err = -ENODEV;
3631                 goto put_host;
3632         }
3633
3634         idx = ev->u.logout_flashnode.flashnode_idx;
3635         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3636         if (!fnode_sess) {
3637                 pr_err("%s could not find flashnode %u for host no %u\n",
3638                        __func__, idx, ev->u.logout_flashnode.host_no);
3639                 err = -ENODEV;
3640                 goto put_host;
3641         }
3642
3643         dev = iscsi_find_flashnode_conn(fnode_sess);
3644         if (!dev) {
3645                 err = -ENODEV;
3646                 goto put_sess;
3647         }
3648
3649         fnode_conn = iscsi_dev_to_flash_conn(dev);
3650
3651         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3652         put_device(dev);
3653
3654 put_sess:
3655         put_device(&fnode_sess->dev);
3656
3657 put_host:
3658         scsi_host_put(shost);
3659
3660 exit_logout_fnode:
3661         return err;
3662 }
3663
3664 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3665                                       struct iscsi_uevent *ev)
3666 {
3667         struct Scsi_Host *shost;
3668         struct iscsi_cls_session *session;
3669         int err = 0;
3670
3671         if (!transport->logout_flashnode_sid) {
3672                 err = -ENOSYS;
3673                 goto exit_logout_sid;
3674         }
3675
3676         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3677         if (!shost) {
3678                 pr_err("%s could not find host no %u\n",
3679                        __func__, ev->u.logout_flashnode.host_no);
3680                 err = -ENODEV;
3681                 goto put_host;
3682         }
3683
3684         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3685         if (!session) {
3686                 pr_err("%s could not find session id %u\n",
3687                        __func__, ev->u.logout_flashnode_sid.sid);
3688                 err = -EINVAL;
3689                 goto put_host;
3690         }
3691
3692         err = transport->logout_flashnode_sid(session);
3693
3694 put_host:
3695         scsi_host_put(shost);
3696
3697 exit_logout_sid:
3698         return err;
3699 }
3700
3701 static int
3702 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3703 {
3704         struct iscsi_uevent *ev = nlmsg_data(nlh);
3705         struct Scsi_Host *shost = NULL;
3706         struct iscsi_internal *priv;
3707         struct sk_buff *skbhost_stats;
3708         struct nlmsghdr *nlhhost_stats;
3709         struct iscsi_uevent *evhost_stats;
3710         int host_stats_size = 0;
3711         int len, err = 0;
3712         char *buf;
3713
3714         if (!transport->get_host_stats)
3715                 return -ENOSYS;
3716
3717         priv = iscsi_if_transport_lookup(transport);
3718         if (!priv)
3719                 return -EINVAL;
3720
3721         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3722         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3723
3724         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3725         if (!shost) {
3726                 pr_err("%s: failed. Could not find host no %u\n",
3727                        __func__, ev->u.get_host_stats.host_no);
3728                 return -ENODEV;
3729         }
3730
3731         do {
3732                 int actual_size;
3733
3734                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3735                 if (!skbhost_stats) {
3736                         pr_err("cannot deliver host stats: OOM\n");
3737                         err = -ENOMEM;
3738                         goto exit_host_stats;
3739                 }
3740
3741                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3742                                       (len - sizeof(*nlhhost_stats)), 0);
3743                 evhost_stats = nlmsg_data(nlhhost_stats);
3744                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3745                 evhost_stats->transport_handle = iscsi_handle(transport);
3746                 evhost_stats->type = nlh->nlmsg_type;
3747                 evhost_stats->u.get_host_stats.host_no =
3748                                         ev->u.get_host_stats.host_no;
3749                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3750                 memset(buf, 0, host_stats_size);
3751
3752                 err = transport->get_host_stats(shost, buf, host_stats_size);
3753                 if (err) {
3754                         kfree_skb(skbhost_stats);
3755                         goto exit_host_stats;
3756                 }
3757
3758                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3759                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3760                 nlhhost_stats->nlmsg_len = actual_size;
3761
3762                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3763                                           GFP_KERNEL);
3764         } while (err < 0 && err != -ECONNREFUSED);
3765
3766 exit_host_stats:
3767         scsi_host_put(shost);
3768         return err;
3769 }
3770
3771 static int iscsi_if_transport_conn(struct iscsi_transport *transport,
3772                                    struct nlmsghdr *nlh)
3773 {
3774         struct iscsi_uevent *ev = nlmsg_data(nlh);
3775         struct iscsi_cls_session *session;
3776         struct iscsi_cls_conn *conn = NULL;
3777         struct iscsi_endpoint *ep;
3778         uint32_t pdu_len;
3779         int err = 0;
3780
3781         switch (nlh->nlmsg_type) {
3782         case ISCSI_UEVENT_CREATE_CONN:
3783                 return iscsi_if_create_conn(transport, ev);
3784         case ISCSI_UEVENT_DESTROY_CONN:
3785                 return iscsi_if_destroy_conn(transport, ev);
3786         case ISCSI_UEVENT_STOP_CONN:
3787                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid,
3788                                          ev->u.stop_conn.cid);
3789                 if (!conn)
3790                         return -EINVAL;
3791
3792                 return iscsi_if_stop_conn(conn, ev->u.stop_conn.flag);
3793         }
3794
3795         /*
3796          * The following cmds need to be run under the ep_mutex so in kernel
3797          * conn cleanup (ep_disconnect + unbind and conn) is not done while
3798          * these are running. They also must not run if we have just run a conn
3799          * cleanup because they would set the state in a way that might allow
3800          * IO or send IO themselves.
3801          */
3802         switch (nlh->nlmsg_type) {
3803         case ISCSI_UEVENT_START_CONN:
3804                 conn = iscsi_conn_lookup(ev->u.start_conn.sid,
3805                                          ev->u.start_conn.cid);
3806                 break;
3807         case ISCSI_UEVENT_BIND_CONN:
3808                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3809                 break;
3810         case ISCSI_UEVENT_SEND_PDU:
3811                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3812                 break;
3813         }
3814
3815         if (!conn)
3816                 return -EINVAL;
3817
3818         mutex_lock(&conn->ep_mutex);
3819         spin_lock_irq(&conn->lock);
3820         if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3821                 spin_unlock_irq(&conn->lock);
3822                 mutex_unlock(&conn->ep_mutex);
3823                 ev->r.retcode = -ENOTCONN;
3824                 return 0;
3825         }
3826         spin_unlock_irq(&conn->lock);
3827
3828         switch (nlh->nlmsg_type) {
3829         case ISCSI_UEVENT_BIND_CONN:
3830                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3831                 if (!session) {
3832                         err = -EINVAL;
3833                         break;
3834                 }
3835
3836                 ev->r.retcode = transport->bind_conn(session, conn,
3837                                                 ev->u.b_conn.transport_eph,
3838                                                 ev->u.b_conn.is_leading);
3839                 if (!ev->r.retcode)
3840                         WRITE_ONCE(conn->state, ISCSI_CONN_BOUND);
3841
3842                 if (ev->r.retcode || !transport->ep_connect)
3843                         break;
3844
3845                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3846                 if (ep) {
3847                         ep->conn = conn;
3848                         conn->ep = ep;
3849                         iscsi_put_endpoint(ep);
3850                 } else {
3851                         err = -ENOTCONN;
3852                         iscsi_cls_conn_printk(KERN_ERR, conn,
3853                                               "Could not set ep conn binding\n");
3854                 }
3855                 break;
3856         case ISCSI_UEVENT_START_CONN:
3857                 ev->r.retcode = transport->start_conn(conn);
3858                 if (!ev->r.retcode)
3859                         WRITE_ONCE(conn->state, ISCSI_CONN_UP);
3860
3861                 break;
3862         case ISCSI_UEVENT_SEND_PDU:
3863                 pdu_len = nlh->nlmsg_len - sizeof(*nlh) - sizeof(*ev);
3864
3865                 if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3866                     (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3867                         err = -EINVAL;
3868                         break;
3869                 }
3870
3871                 ev->r.retcode = transport->send_pdu(conn,
3872                                 (struct iscsi_hdr *)((char *)ev + sizeof(*ev)),
3873                                 (char *)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3874                                 ev->u.send_pdu.data_size);
3875                 break;
3876         default:
3877                 err = -ENOSYS;
3878         }
3879
3880         mutex_unlock(&conn->ep_mutex);
3881         return err;
3882 }
3883
3884 static int
3885 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3886 {
3887         int err = 0;
3888         u32 portid;
3889         struct iscsi_uevent *ev = nlmsg_data(nlh);
3890         struct iscsi_transport *transport = NULL;
3891         struct iscsi_internal *priv;
3892         struct iscsi_cls_session *session;
3893         struct iscsi_endpoint *ep = NULL;
3894
3895         if (!netlink_capable(skb, CAP_SYS_ADMIN))
3896                 return -EPERM;
3897
3898         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3899                 *group = ISCSI_NL_GRP_UIP;
3900         else
3901                 *group = ISCSI_NL_GRP_ISCSID;
3902
3903         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3904         if (!priv)
3905                 return -EINVAL;
3906         transport = priv->iscsi_transport;
3907
3908         if (!try_module_get(transport->owner))
3909                 return -EINVAL;
3910
3911         portid = NETLINK_CB(skb).portid;
3912
3913         switch (nlh->nlmsg_type) {
3914         case ISCSI_UEVENT_CREATE_SESSION:
3915                 err = iscsi_if_create_session(priv, ep, ev,
3916                                               portid,
3917                                               ev->u.c_session.initial_cmdsn,
3918                                               ev->u.c_session.cmds_max,
3919                                               ev->u.c_session.queue_depth);
3920                 break;
3921         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3922                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3923                 if (!ep) {
3924                         err = -EINVAL;
3925                         break;
3926                 }
3927
3928                 err = iscsi_if_create_session(priv, ep, ev,
3929                                         portid,
3930                                         ev->u.c_bound_session.initial_cmdsn,
3931                                         ev->u.c_bound_session.cmds_max,
3932                                         ev->u.c_bound_session.queue_depth);
3933                 iscsi_put_endpoint(ep);
3934                 break;
3935         case ISCSI_UEVENT_DESTROY_SESSION:
3936                 session = iscsi_session_lookup(ev->u.d_session.sid);
3937                 if (!session)
3938                         err = -EINVAL;
3939                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3940                         err = -EBUSY;
3941                 else
3942                         transport->destroy_session(session);
3943                 break;
3944         case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3945                 session = iscsi_session_lookup(ev->u.d_session.sid);
3946                 if (!session)
3947                         err = -EINVAL;
3948                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3949                         err = -EBUSY;
3950                 else {
3951                         unsigned long flags;
3952
3953                         /* Prevent this session from being found again */
3954                         spin_lock_irqsave(&sesslock, flags);
3955                         list_del_init(&session->sess_list);
3956                         spin_unlock_irqrestore(&sesslock, flags);
3957
3958                         queue_work(system_unbound_wq, &session->destroy_work);
3959                 }
3960                 break;
3961         case ISCSI_UEVENT_UNBIND_SESSION:
3962                 session = iscsi_session_lookup(ev->u.d_session.sid);
3963                 if (session)
3964                         queue_work(session->workq, &session->unbind_work);
3965                 else
3966                         err = -EINVAL;
3967                 break;
3968         case ISCSI_UEVENT_SET_PARAM:
3969                 err = iscsi_if_set_param(transport, ev);
3970                 break;
3971         case ISCSI_UEVENT_CREATE_CONN:
3972         case ISCSI_UEVENT_DESTROY_CONN:
3973         case ISCSI_UEVENT_STOP_CONN:
3974         case ISCSI_UEVENT_START_CONN:
3975         case ISCSI_UEVENT_BIND_CONN:
3976         case ISCSI_UEVENT_SEND_PDU:
3977                 err = iscsi_if_transport_conn(transport, nlh);
3978                 break;
3979         case ISCSI_UEVENT_GET_STATS:
3980                 err = iscsi_if_get_stats(transport, nlh);
3981                 break;
3982         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3983         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3984         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3985         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3986                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3987                 break;
3988         case ISCSI_UEVENT_TGT_DSCVR:
3989                 err = iscsi_tgt_dscvr(transport, ev);
3990                 break;
3991         case ISCSI_UEVENT_SET_HOST_PARAM:
3992                 err = iscsi_set_host_param(transport, ev);
3993                 break;
3994         case ISCSI_UEVENT_PATH_UPDATE:
3995                 err = iscsi_set_path(transport, ev);
3996                 break;
3997         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3998                 err = iscsi_set_iface_params(transport, ev,
3999                                              nlmsg_attrlen(nlh, sizeof(*ev)));
4000                 break;
4001         case ISCSI_UEVENT_PING:
4002                 err = iscsi_send_ping(transport, ev);
4003                 break;
4004         case ISCSI_UEVENT_GET_CHAP:
4005                 err = iscsi_get_chap(transport, nlh);
4006                 break;
4007         case ISCSI_UEVENT_DELETE_CHAP:
4008                 err = iscsi_delete_chap(transport, ev);
4009                 break;
4010         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
4011                 err = iscsi_set_flashnode_param(transport, ev,
4012                                                 nlmsg_attrlen(nlh,
4013                                                               sizeof(*ev)));
4014                 break;
4015         case ISCSI_UEVENT_NEW_FLASHNODE:
4016                 err = iscsi_new_flashnode(transport, ev,
4017                                           nlmsg_attrlen(nlh, sizeof(*ev)));
4018                 break;
4019         case ISCSI_UEVENT_DEL_FLASHNODE:
4020                 err = iscsi_del_flashnode(transport, ev);
4021                 break;
4022         case ISCSI_UEVENT_LOGIN_FLASHNODE:
4023                 err = iscsi_login_flashnode(transport, ev);
4024                 break;
4025         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
4026                 err = iscsi_logout_flashnode(transport, ev);
4027                 break;
4028         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
4029                 err = iscsi_logout_flashnode_sid(transport, ev);
4030                 break;
4031         case ISCSI_UEVENT_SET_CHAP:
4032                 err = iscsi_set_chap(transport, ev,
4033                                      nlmsg_attrlen(nlh, sizeof(*ev)));
4034                 break;
4035         case ISCSI_UEVENT_GET_HOST_STATS:
4036                 err = iscsi_get_host_stats(transport, nlh);
4037                 break;
4038         default:
4039                 err = -ENOSYS;
4040                 break;
4041         }
4042
4043         module_put(transport->owner);
4044         return err;
4045 }
4046
4047 /*
4048  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
4049  * Malformed skbs with wrong lengths or invalid creds are not processed.
4050  */
4051 static void
4052 iscsi_if_rx(struct sk_buff *skb)
4053 {
4054         u32 portid = NETLINK_CB(skb).portid;
4055
4056         mutex_lock(&rx_queue_mutex);
4057         while (skb->len >= NLMSG_HDRLEN) {
4058                 int err;
4059                 uint32_t rlen;
4060                 struct nlmsghdr *nlh;
4061                 struct iscsi_uevent *ev;
4062                 uint32_t group;
4063                 int retries = ISCSI_SEND_MAX_ALLOWED;
4064
4065                 nlh = nlmsg_hdr(skb);
4066                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
4067                     skb->len < nlh->nlmsg_len) {
4068                         break;
4069                 }
4070
4071                 ev = nlmsg_data(nlh);
4072                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
4073                 if (rlen > skb->len)
4074                         rlen = skb->len;
4075
4076                 err = iscsi_if_recv_msg(skb, nlh, &group);
4077                 if (err) {
4078                         ev->type = ISCSI_KEVENT_IF_ERROR;
4079                         ev->iferror = err;
4080                 }
4081                 do {
4082                         /*
4083                          * special case for GET_STATS:
4084                          * on success - sending reply and stats from
4085                          * inside of if_recv_msg(),
4086                          * on error - fall through.
4087                          */
4088                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
4089                                 break;
4090                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
4091                                 break;
4092                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
4093                                                   ev, sizeof(*ev));
4094                         if (err == -EAGAIN && --retries < 0) {
4095                                 printk(KERN_WARNING "Send reply failed, error %d\n", err);
4096                                 break;
4097                         }
4098                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
4099                 skb_pull(skb, rlen);
4100         }
4101         mutex_unlock(&rx_queue_mutex);
4102 }
4103
4104 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
4105 struct device_attribute dev_attr_##_prefix##_##_name =  \
4106         __ATTR(_name,_mode,_show,_store)
4107
4108 /*
4109  * iSCSI connection attrs
4110  */
4111 #define iscsi_conn_attr_show(param)                                     \
4112 static ssize_t                                                          \
4113 show_conn_param_##param(struct device *dev,                             \
4114                         struct device_attribute *attr, char *buf)       \
4115 {                                                                       \
4116         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4117         struct iscsi_transport *t = conn->transport;                    \
4118         return t->get_conn_param(conn, param, buf);                     \
4119 }
4120
4121 #define iscsi_conn_attr(field, param)                                   \
4122         iscsi_conn_attr_show(param)                                     \
4123 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
4124                         NULL);
4125
4126 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
4127 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
4128 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
4129 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
4130 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
4131 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
4132 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
4133 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
4134 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
4135 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
4136 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
4137 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
4138 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
4139 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
4140 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
4141 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
4142 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
4143 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
4144 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
4145 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
4146 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
4147 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
4148 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
4149 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
4150 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
4151 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
4152 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
4153 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
4154
4155 static const char *const connection_state_names[] = {
4156         [ISCSI_CONN_UP] = "up",
4157         [ISCSI_CONN_DOWN] = "down",
4158         [ISCSI_CONN_FAILED] = "failed",
4159         [ISCSI_CONN_BOUND] = "bound"
4160 };
4161
4162 static ssize_t show_conn_state(struct device *dev,
4163                                struct device_attribute *attr, char *buf)
4164 {
4165         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
4166         const char *state = "unknown";
4167         int conn_state = READ_ONCE(conn->state);
4168
4169         if (conn_state >= 0 &&
4170             conn_state < ARRAY_SIZE(connection_state_names))
4171                 state = connection_state_names[conn_state];
4172
4173         return sysfs_emit(buf, "%s\n", state);
4174 }
4175 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
4176                         NULL);
4177
4178 #define iscsi_conn_ep_attr_show(param)                                  \
4179 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
4180                                           struct device_attribute *attr,\
4181                                           char *buf)                    \
4182 {                                                                       \
4183         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4184         struct iscsi_transport *t = conn->transport;                    \
4185         struct iscsi_endpoint *ep;                                      \
4186         ssize_t rc;                                                     \
4187                                                                         \
4188         /*                                                              \
4189          * Need to make sure ep_disconnect does not free the LLD's      \
4190          * interconnect resources while we are trying to read them.     \
4191          */                                                             \
4192         mutex_lock(&conn->ep_mutex);                                    \
4193         ep = conn->ep;                                                  \
4194         if (!ep && t->ep_connect) {                                     \
4195                 mutex_unlock(&conn->ep_mutex);                          \
4196                 return -ENOTCONN;                                       \
4197         }                                                               \
4198                                                                         \
4199         if (ep)                                                         \
4200                 rc = t->get_ep_param(ep, param, buf);                   \
4201         else                                                            \
4202                 rc = t->get_conn_param(conn, param, buf);               \
4203         mutex_unlock(&conn->ep_mutex);                                  \
4204         return rc;                                                      \
4205 }
4206
4207 #define iscsi_conn_ep_attr(field, param)                                \
4208         iscsi_conn_ep_attr_show(param)                                  \
4209 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
4210                         show_conn_ep_param_##param, NULL);
4211
4212 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4213 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4214
4215 static struct attribute *iscsi_conn_attrs[] = {
4216         &dev_attr_conn_max_recv_dlength.attr,
4217         &dev_attr_conn_max_xmit_dlength.attr,
4218         &dev_attr_conn_header_digest.attr,
4219         &dev_attr_conn_data_digest.attr,
4220         &dev_attr_conn_ifmarker.attr,
4221         &dev_attr_conn_ofmarker.attr,
4222         &dev_attr_conn_address.attr,
4223         &dev_attr_conn_port.attr,
4224         &dev_attr_conn_exp_statsn.attr,
4225         &dev_attr_conn_persistent_address.attr,
4226         &dev_attr_conn_persistent_port.attr,
4227         &dev_attr_conn_ping_tmo.attr,
4228         &dev_attr_conn_recv_tmo.attr,
4229         &dev_attr_conn_local_port.attr,
4230         &dev_attr_conn_statsn.attr,
4231         &dev_attr_conn_keepalive_tmo.attr,
4232         &dev_attr_conn_max_segment_size.attr,
4233         &dev_attr_conn_tcp_timestamp_stat.attr,
4234         &dev_attr_conn_tcp_wsf_disable.attr,
4235         &dev_attr_conn_tcp_nagle_disable.attr,
4236         &dev_attr_conn_tcp_timer_scale.attr,
4237         &dev_attr_conn_tcp_timestamp_enable.attr,
4238         &dev_attr_conn_fragment_disable.attr,
4239         &dev_attr_conn_ipv4_tos.attr,
4240         &dev_attr_conn_ipv6_traffic_class.attr,
4241         &dev_attr_conn_ipv6_flow_label.attr,
4242         &dev_attr_conn_is_fw_assigned_ipv6.attr,
4243         &dev_attr_conn_tcp_xmit_wsf.attr,
4244         &dev_attr_conn_tcp_recv_wsf.attr,
4245         &dev_attr_conn_local_ipaddr.attr,
4246         &dev_attr_conn_state.attr,
4247         NULL,
4248 };
4249
4250 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4251                                          struct attribute *attr, int i)
4252 {
4253         struct device *cdev = container_of(kobj, struct device, kobj);
4254         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4255         struct iscsi_transport *t = conn->transport;
4256         int param;
4257
4258         if (attr == &dev_attr_conn_max_recv_dlength.attr)
4259                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4260         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4261                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4262         else if (attr == &dev_attr_conn_header_digest.attr)
4263                 param = ISCSI_PARAM_HDRDGST_EN;
4264         else if (attr == &dev_attr_conn_data_digest.attr)
4265                 param = ISCSI_PARAM_DATADGST_EN;
4266         else if (attr == &dev_attr_conn_ifmarker.attr)
4267                 param = ISCSI_PARAM_IFMARKER_EN;
4268         else if (attr == &dev_attr_conn_ofmarker.attr)
4269                 param = ISCSI_PARAM_OFMARKER_EN;
4270         else if (attr == &dev_attr_conn_address.attr)
4271                 param = ISCSI_PARAM_CONN_ADDRESS;
4272         else if (attr == &dev_attr_conn_port.attr)
4273                 param = ISCSI_PARAM_CONN_PORT;
4274         else if (attr == &dev_attr_conn_exp_statsn.attr)
4275                 param = ISCSI_PARAM_EXP_STATSN;
4276         else if (attr == &dev_attr_conn_persistent_address.attr)
4277                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4278         else if (attr == &dev_attr_conn_persistent_port.attr)
4279                 param = ISCSI_PARAM_PERSISTENT_PORT;
4280         else if (attr == &dev_attr_conn_ping_tmo.attr)
4281                 param = ISCSI_PARAM_PING_TMO;
4282         else if (attr == &dev_attr_conn_recv_tmo.attr)
4283                 param = ISCSI_PARAM_RECV_TMO;
4284         else if (attr == &dev_attr_conn_local_port.attr)
4285                 param = ISCSI_PARAM_LOCAL_PORT;
4286         else if (attr == &dev_attr_conn_statsn.attr)
4287                 param = ISCSI_PARAM_STATSN;
4288         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4289                 param = ISCSI_PARAM_KEEPALIVE_TMO;
4290         else if (attr == &dev_attr_conn_max_segment_size.attr)
4291                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4292         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4293                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4294         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4295                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
4296         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4297                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4298         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4299                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
4300         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4301                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4302         else if (attr == &dev_attr_conn_fragment_disable.attr)
4303                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4304         else if (attr == &dev_attr_conn_ipv4_tos.attr)
4305                 param = ISCSI_PARAM_IPV4_TOS;
4306         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4307                 param = ISCSI_PARAM_IPV6_TC;
4308         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4309                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4310         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4311                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4312         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4313                 param = ISCSI_PARAM_TCP_XMIT_WSF;
4314         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4315                 param = ISCSI_PARAM_TCP_RECV_WSF;
4316         else if (attr == &dev_attr_conn_local_ipaddr.attr)
4317                 param = ISCSI_PARAM_LOCAL_IPADDR;
4318         else if (attr == &dev_attr_conn_state.attr)
4319                 return S_IRUGO;
4320         else {
4321                 WARN_ONCE(1, "Invalid conn attr");
4322                 return 0;
4323         }
4324
4325         return t->attr_is_visible(ISCSI_PARAM, param);
4326 }
4327
4328 static struct attribute_group iscsi_conn_group = {
4329         .attrs = iscsi_conn_attrs,
4330         .is_visible = iscsi_conn_attr_is_visible,
4331 };
4332
4333 /*
4334  * iSCSI session attrs
4335  */
4336 #define iscsi_session_attr_show(param, perm)                            \
4337 static ssize_t                                                          \
4338 show_session_param_##param(struct device *dev,                          \
4339                            struct device_attribute *attr, char *buf)    \
4340 {                                                                       \
4341         struct iscsi_cls_session *session =                             \
4342                 iscsi_dev_to_session(dev->parent);                      \
4343         struct iscsi_transport *t = session->transport;                 \
4344                                                                         \
4345         if (perm && !capable(CAP_SYS_ADMIN))                            \
4346                 return -EACCES;                                         \
4347         return t->get_session_param(session, param, buf);               \
4348 }
4349
4350 #define iscsi_session_attr(field, param, perm)                          \
4351         iscsi_session_attr_show(param, perm)                            \
4352 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4353                         NULL);
4354 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4355 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4356 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4357 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4358 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4359 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4360 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4361 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4362 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4363 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4364 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4365 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4366 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4367 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4368 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4369 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4370 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4371 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4372 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4373 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4374 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4375 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4376 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4377 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4378 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4379 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4380 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4381 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4382 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4383 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4384 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4385 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4386 iscsi_session_attr(discovery_auth_optional,
4387                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4388 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4389 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4390 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4391 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4392 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4393 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4394 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4395
4396 static ssize_t
4397 show_priv_session_target_state(struct device *dev, struct device_attribute *attr,
4398                         char *buf)
4399 {
4400         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4401
4402         return sysfs_emit(buf, "%s\n",
4403                         iscsi_session_target_state_name[session->target_state]);
4404 }
4405
4406 static ISCSI_CLASS_ATTR(priv_sess, target_state, S_IRUGO,
4407                         show_priv_session_target_state, NULL);
4408
4409 static ssize_t
4410 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4411                         char *buf)
4412 {
4413         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4414         return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4415 }
4416 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4417                         NULL);
4418 static ssize_t
4419 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4420                         char *buf)
4421 {
4422         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4423         return sysfs_emit(buf, "%d\n", session->creator);
4424 }
4425 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4426                         NULL);
4427 static ssize_t
4428 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4429                             char *buf)
4430 {
4431         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4432         return sysfs_emit(buf, "%d\n", session->target_id);
4433 }
4434 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4435                         show_priv_session_target_id, NULL);
4436
4437 #define iscsi_priv_session_attr_show(field, format)                     \
4438 static ssize_t                                                          \
4439 show_priv_session_##field(struct device *dev,                           \
4440                           struct device_attribute *attr, char *buf)     \
4441 {                                                                       \
4442         struct iscsi_cls_session *session =                             \
4443                         iscsi_dev_to_session(dev->parent);              \
4444         if (session->field == -1)                                       \
4445                 return sysfs_emit(buf, "off\n");                        \
4446         return sysfs_emit(buf, format"\n", session->field);             \
4447 }
4448
4449 #define iscsi_priv_session_attr_store(field)                            \
4450 static ssize_t                                                          \
4451 store_priv_session_##field(struct device *dev,                          \
4452                            struct device_attribute *attr,               \
4453                            const char *buf, size_t count)               \
4454 {                                                                       \
4455         int val;                                                        \
4456         char *cp;                                                       \
4457         struct iscsi_cls_session *session =                             \
4458                 iscsi_dev_to_session(dev->parent);                      \
4459         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4460             (session->state == ISCSI_SESSION_FAILED))                   \
4461                 return -EBUSY;                                          \
4462         if (strncmp(buf, "off", 3) == 0) {                              \
4463                 session->field = -1;                                    \
4464                 session->field##_sysfs_override = true;                 \
4465         } else {                                                        \
4466                 val = simple_strtoul(buf, &cp, 0);                      \
4467                 if (*cp != '\0' && *cp != '\n')                         \
4468                         return -EINVAL;                                 \
4469                 session->field = val;                                   \
4470                 session->field##_sysfs_override = true;                 \
4471         }                                                               \
4472         return count;                                                   \
4473 }
4474
4475 #define iscsi_priv_session_rw_attr(field, format)                       \
4476         iscsi_priv_session_attr_show(field, format)                     \
4477         iscsi_priv_session_attr_store(field)                            \
4478 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4479                         show_priv_session_##field,                      \
4480                         store_priv_session_##field)
4481
4482 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4483
4484 static struct attribute *iscsi_session_attrs[] = {
4485         &dev_attr_sess_initial_r2t.attr,
4486         &dev_attr_sess_max_outstanding_r2t.attr,
4487         &dev_attr_sess_immediate_data.attr,
4488         &dev_attr_sess_first_burst_len.attr,
4489         &dev_attr_sess_max_burst_len.attr,
4490         &dev_attr_sess_data_pdu_in_order.attr,
4491         &dev_attr_sess_data_seq_in_order.attr,
4492         &dev_attr_sess_erl.attr,
4493         &dev_attr_sess_targetname.attr,
4494         &dev_attr_sess_tpgt.attr,
4495         &dev_attr_sess_password.attr,
4496         &dev_attr_sess_password_in.attr,
4497         &dev_attr_sess_username.attr,
4498         &dev_attr_sess_username_in.attr,
4499         &dev_attr_sess_fast_abort.attr,
4500         &dev_attr_sess_abort_tmo.attr,
4501         &dev_attr_sess_lu_reset_tmo.attr,
4502         &dev_attr_sess_tgt_reset_tmo.attr,
4503         &dev_attr_sess_ifacename.attr,
4504         &dev_attr_sess_initiatorname.attr,
4505         &dev_attr_sess_targetalias.attr,
4506         &dev_attr_sess_boot_root.attr,
4507         &dev_attr_sess_boot_nic.attr,
4508         &dev_attr_sess_boot_target.attr,
4509         &dev_attr_priv_sess_recovery_tmo.attr,
4510         &dev_attr_priv_sess_state.attr,
4511         &dev_attr_priv_sess_target_state.attr,
4512         &dev_attr_priv_sess_creator.attr,
4513         &dev_attr_sess_chap_out_idx.attr,
4514         &dev_attr_sess_chap_in_idx.attr,
4515         &dev_attr_priv_sess_target_id.attr,
4516         &dev_attr_sess_auto_snd_tgt_disable.attr,
4517         &dev_attr_sess_discovery_session.attr,
4518         &dev_attr_sess_portal_type.attr,
4519         &dev_attr_sess_chap_auth.attr,
4520         &dev_attr_sess_discovery_logout.attr,
4521         &dev_attr_sess_bidi_chap.attr,
4522         &dev_attr_sess_discovery_auth_optional.attr,
4523         &dev_attr_sess_def_time2wait.attr,
4524         &dev_attr_sess_def_time2retain.attr,
4525         &dev_attr_sess_isid.attr,
4526         &dev_attr_sess_tsid.attr,
4527         &dev_attr_sess_def_taskmgmt_tmo.attr,
4528         &dev_attr_sess_discovery_parent_idx.attr,
4529         &dev_attr_sess_discovery_parent_type.attr,
4530         NULL,
4531 };
4532
4533 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4534                                             struct attribute *attr, int i)
4535 {
4536         struct device *cdev = container_of(kobj, struct device, kobj);
4537         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4538         struct iscsi_transport *t = session->transport;
4539         int param;
4540
4541         if (attr == &dev_attr_sess_initial_r2t.attr)
4542                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4543         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4544                 param = ISCSI_PARAM_MAX_R2T;
4545         else if (attr == &dev_attr_sess_immediate_data.attr)
4546                 param = ISCSI_PARAM_IMM_DATA_EN;
4547         else if (attr == &dev_attr_sess_first_burst_len.attr)
4548                 param = ISCSI_PARAM_FIRST_BURST;
4549         else if (attr == &dev_attr_sess_max_burst_len.attr)
4550                 param = ISCSI_PARAM_MAX_BURST;
4551         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4552                 param = ISCSI_PARAM_PDU_INORDER_EN;
4553         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4554                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4555         else if (attr == &dev_attr_sess_erl.attr)
4556                 param = ISCSI_PARAM_ERL;
4557         else if (attr == &dev_attr_sess_targetname.attr)
4558                 param = ISCSI_PARAM_TARGET_NAME;
4559         else if (attr == &dev_attr_sess_tpgt.attr)
4560                 param = ISCSI_PARAM_TPGT;
4561         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4562                 param = ISCSI_PARAM_CHAP_IN_IDX;
4563         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4564                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4565         else if (attr == &dev_attr_sess_password.attr)
4566                 param = ISCSI_PARAM_USERNAME;
4567         else if (attr == &dev_attr_sess_password_in.attr)
4568                 param = ISCSI_PARAM_USERNAME_IN;
4569         else if (attr == &dev_attr_sess_username.attr)
4570                 param = ISCSI_PARAM_PASSWORD;
4571         else if (attr == &dev_attr_sess_username_in.attr)
4572                 param = ISCSI_PARAM_PASSWORD_IN;
4573         else if (attr == &dev_attr_sess_fast_abort.attr)
4574                 param = ISCSI_PARAM_FAST_ABORT;
4575         else if (attr == &dev_attr_sess_abort_tmo.attr)
4576                 param = ISCSI_PARAM_ABORT_TMO;
4577         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4578                 param = ISCSI_PARAM_LU_RESET_TMO;
4579         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4580                 param = ISCSI_PARAM_TGT_RESET_TMO;
4581         else if (attr == &dev_attr_sess_ifacename.attr)
4582                 param = ISCSI_PARAM_IFACE_NAME;
4583         else if (attr == &dev_attr_sess_initiatorname.attr)
4584                 param = ISCSI_PARAM_INITIATOR_NAME;
4585         else if (attr == &dev_attr_sess_targetalias.attr)
4586                 param = ISCSI_PARAM_TARGET_ALIAS;
4587         else if (attr == &dev_attr_sess_boot_root.attr)
4588                 param = ISCSI_PARAM_BOOT_ROOT;
4589         else if (attr == &dev_attr_sess_boot_nic.attr)
4590                 param = ISCSI_PARAM_BOOT_NIC;
4591         else if (attr == &dev_attr_sess_boot_target.attr)
4592                 param = ISCSI_PARAM_BOOT_TARGET;
4593         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4594                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4595         else if (attr == &dev_attr_sess_discovery_session.attr)
4596                 param = ISCSI_PARAM_DISCOVERY_SESS;
4597         else if (attr == &dev_attr_sess_portal_type.attr)
4598                 param = ISCSI_PARAM_PORTAL_TYPE;
4599         else if (attr == &dev_attr_sess_chap_auth.attr)
4600                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4601         else if (attr == &dev_attr_sess_discovery_logout.attr)
4602                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4603         else if (attr == &dev_attr_sess_bidi_chap.attr)
4604                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4605         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4606                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4607         else if (attr == &dev_attr_sess_def_time2wait.attr)
4608                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4609         else if (attr == &dev_attr_sess_def_time2retain.attr)
4610                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4611         else if (attr == &dev_attr_sess_isid.attr)
4612                 param = ISCSI_PARAM_ISID;
4613         else if (attr == &dev_attr_sess_tsid.attr)
4614                 param = ISCSI_PARAM_TSID;
4615         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4616                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4617         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4618                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4619         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4620                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4621         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4622                 return S_IRUGO | S_IWUSR;
4623         else if (attr == &dev_attr_priv_sess_state.attr)
4624                 return S_IRUGO;
4625         else if (attr == &dev_attr_priv_sess_target_state.attr)
4626                 return S_IRUGO;
4627         else if (attr == &dev_attr_priv_sess_creator.attr)
4628                 return S_IRUGO;
4629         else if (attr == &dev_attr_priv_sess_target_id.attr)
4630                 return S_IRUGO;
4631         else {
4632                 WARN_ONCE(1, "Invalid session attr");
4633                 return 0;
4634         }
4635
4636         return t->attr_is_visible(ISCSI_PARAM, param);
4637 }
4638
4639 static struct attribute_group iscsi_session_group = {
4640         .attrs = iscsi_session_attrs,
4641         .is_visible = iscsi_session_attr_is_visible,
4642 };
4643
4644 /*
4645  * iSCSI host attrs
4646  */
4647 #define iscsi_host_attr_show(param)                                     \
4648 static ssize_t                                                          \
4649 show_host_param_##param(struct device *dev,                             \
4650                         struct device_attribute *attr, char *buf)       \
4651 {                                                                       \
4652         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4653         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4654         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4655 }
4656
4657 #define iscsi_host_attr(field, param)                                   \
4658         iscsi_host_attr_show(param)                                     \
4659 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4660                         NULL);
4661
4662 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4663 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4664 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4665 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4666 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4667 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4668
4669 static struct attribute *iscsi_host_attrs[] = {
4670         &dev_attr_host_netdev.attr,
4671         &dev_attr_host_hwaddress.attr,
4672         &dev_attr_host_ipaddress.attr,
4673         &dev_attr_host_initiatorname.attr,
4674         &dev_attr_host_port_state.attr,
4675         &dev_attr_host_port_speed.attr,
4676         NULL,
4677 };
4678
4679 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4680                                          struct attribute *attr, int i)
4681 {
4682         struct device *cdev = container_of(kobj, struct device, kobj);
4683         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4684         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4685         int param;
4686
4687         if (attr == &dev_attr_host_netdev.attr)
4688                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4689         else if (attr == &dev_attr_host_hwaddress.attr)
4690                 param = ISCSI_HOST_PARAM_HWADDRESS;
4691         else if (attr == &dev_attr_host_ipaddress.attr)
4692                 param = ISCSI_HOST_PARAM_IPADDRESS;
4693         else if (attr == &dev_attr_host_initiatorname.attr)
4694                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4695         else if (attr == &dev_attr_host_port_state.attr)
4696                 param = ISCSI_HOST_PARAM_PORT_STATE;
4697         else if (attr == &dev_attr_host_port_speed.attr)
4698                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4699         else {
4700                 WARN_ONCE(1, "Invalid host attr");
4701                 return 0;
4702         }
4703
4704         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4705 }
4706
4707 static struct attribute_group iscsi_host_group = {
4708         .attrs = iscsi_host_attrs,
4709         .is_visible = iscsi_host_attr_is_visible,
4710 };
4711
4712 /* convert iscsi_port_speed values to ascii string name */
4713 static const struct {
4714         enum iscsi_port_speed   value;
4715         char                    *name;
4716 } iscsi_port_speed_names[] = {
4717         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4718         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4719         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4720         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4721         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4722         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4723         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4724 };
4725
4726 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4727 {
4728         int i;
4729         char *speed = "Unknown!";
4730         struct iscsi_cls_host *ihost = shost->shost_data;
4731         uint32_t port_speed = ihost->port_speed;
4732
4733         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4734                 if (iscsi_port_speed_names[i].value & port_speed) {
4735                         speed = iscsi_port_speed_names[i].name;
4736                         break;
4737                 }
4738         }
4739         return speed;
4740 }
4741 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4742
4743 /* convert iscsi_port_state values to ascii string name */
4744 static const struct {
4745         enum iscsi_port_state   value;
4746         char                    *name;
4747 } iscsi_port_state_names[] = {
4748         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4749         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4750 };
4751
4752 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4753 {
4754         int i;
4755         char *state = "Unknown!";
4756         struct iscsi_cls_host *ihost = shost->shost_data;
4757         uint32_t port_state = ihost->port_state;
4758
4759         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4760                 if (iscsi_port_state_names[i].value & port_state) {
4761                         state = iscsi_port_state_names[i].name;
4762                         break;
4763                 }
4764         }
4765         return state;
4766 }
4767 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4768
4769 static int iscsi_session_match(struct attribute_container *cont,
4770                            struct device *dev)
4771 {
4772         struct iscsi_cls_session *session;
4773         struct Scsi_Host *shost;
4774         struct iscsi_internal *priv;
4775
4776         if (!iscsi_is_session_dev(dev))
4777                 return 0;
4778
4779         session = iscsi_dev_to_session(dev);
4780         shost = iscsi_session_to_shost(session);
4781         if (!shost->transportt)
4782                 return 0;
4783
4784         priv = to_iscsi_internal(shost->transportt);
4785         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4786                 return 0;
4787
4788         return &priv->session_cont.ac == cont;
4789 }
4790
4791 static int iscsi_conn_match(struct attribute_container *cont,
4792                            struct device *dev)
4793 {
4794         struct iscsi_cls_session *session;
4795         struct iscsi_cls_conn *conn;
4796         struct Scsi_Host *shost;
4797         struct iscsi_internal *priv;
4798
4799         if (!iscsi_is_conn_dev(dev))
4800                 return 0;
4801
4802         conn = iscsi_dev_to_conn(dev);
4803         session = iscsi_dev_to_session(conn->dev.parent);
4804         shost = iscsi_session_to_shost(session);
4805
4806         if (!shost->transportt)
4807                 return 0;
4808
4809         priv = to_iscsi_internal(shost->transportt);
4810         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4811                 return 0;
4812
4813         return &priv->conn_cont.ac == cont;
4814 }
4815
4816 static int iscsi_host_match(struct attribute_container *cont,
4817                             struct device *dev)
4818 {
4819         struct Scsi_Host *shost;
4820         struct iscsi_internal *priv;
4821
4822         if (!scsi_is_host_device(dev))
4823                 return 0;
4824
4825         shost = dev_to_shost(dev);
4826         if (!shost->transportt  ||
4827             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4828                 return 0;
4829
4830         priv = to_iscsi_internal(shost->transportt);
4831         return &priv->t.host_attrs.ac == cont;
4832 }
4833
4834 struct scsi_transport_template *
4835 iscsi_register_transport(struct iscsi_transport *tt)
4836 {
4837         struct iscsi_internal *priv;
4838         unsigned long flags;
4839         int err;
4840
4841         BUG_ON(!tt);
4842         WARN_ON(tt->ep_disconnect && !tt->unbind_conn);
4843
4844         priv = iscsi_if_transport_lookup(tt);
4845         if (priv)
4846                 return NULL;
4847
4848         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4849         if (!priv)
4850                 return NULL;
4851         INIT_LIST_HEAD(&priv->list);
4852         priv->iscsi_transport = tt;
4853         priv->t.user_scan = iscsi_user_scan;
4854
4855         priv->dev.class = &iscsi_transport_class;
4856         dev_set_name(&priv->dev, "%s", tt->name);
4857         err = device_register(&priv->dev);
4858         if (err)
4859                 goto put_dev;
4860
4861         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4862         if (err)
4863                 goto unregister_dev;
4864
4865         /* host parameters */
4866         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4867         priv->t.host_attrs.ac.match = iscsi_host_match;
4868         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4869         priv->t.host_size = sizeof(struct iscsi_cls_host);
4870         transport_container_register(&priv->t.host_attrs);
4871
4872         /* connection parameters */
4873         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4874         priv->conn_cont.ac.match = iscsi_conn_match;
4875         priv->conn_cont.ac.grp = &iscsi_conn_group;
4876         transport_container_register(&priv->conn_cont);
4877
4878         /* session parameters */
4879         priv->session_cont.ac.class = &iscsi_session_class.class;
4880         priv->session_cont.ac.match = iscsi_session_match;
4881         priv->session_cont.ac.grp = &iscsi_session_group;
4882         transport_container_register(&priv->session_cont);
4883
4884         spin_lock_irqsave(&iscsi_transport_lock, flags);
4885         list_add(&priv->list, &iscsi_transports);
4886         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4887
4888         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4889         return &priv->t;
4890
4891 unregister_dev:
4892         device_unregister(&priv->dev);
4893         return NULL;
4894 put_dev:
4895         put_device(&priv->dev);
4896         return NULL;
4897 }
4898 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4899
4900 void iscsi_unregister_transport(struct iscsi_transport *tt)
4901 {
4902         struct iscsi_internal *priv;
4903         unsigned long flags;
4904
4905         BUG_ON(!tt);
4906
4907         mutex_lock(&rx_queue_mutex);
4908
4909         priv = iscsi_if_transport_lookup(tt);
4910         BUG_ON (!priv);
4911
4912         spin_lock_irqsave(&iscsi_transport_lock, flags);
4913         list_del(&priv->list);
4914         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4915
4916         transport_container_unregister(&priv->conn_cont);
4917         transport_container_unregister(&priv->session_cont);
4918         transport_container_unregister(&priv->t.host_attrs);
4919
4920         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4921         device_unregister(&priv->dev);
4922         mutex_unlock(&rx_queue_mutex);
4923 }
4924 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4925
4926 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4927                      struct device *dev, const char *fmt, ...)
4928 {
4929         struct va_format vaf;
4930         va_list args;
4931
4932         va_start(args, fmt);
4933         vaf.fmt = fmt;
4934         vaf.va = &args;
4935         trace(dev, &vaf);
4936         va_end(args);
4937 }
4938 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4939
4940 static __init int iscsi_transport_init(void)
4941 {
4942         int err;
4943         struct netlink_kernel_cfg cfg = {
4944                 .groups = 1,
4945                 .input  = iscsi_if_rx,
4946         };
4947         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4948                 ISCSI_TRANSPORT_VERSION);
4949
4950         atomic_set(&iscsi_session_nr, 0);
4951
4952         err = class_register(&iscsi_transport_class);
4953         if (err)
4954                 return err;
4955
4956         err = class_register(&iscsi_endpoint_class);
4957         if (err)
4958                 goto unregister_transport_class;
4959
4960         err = class_register(&iscsi_iface_class);
4961         if (err)
4962                 goto unregister_endpoint_class;
4963
4964         err = transport_class_register(&iscsi_host_class);
4965         if (err)
4966                 goto unregister_iface_class;
4967
4968         err = transport_class_register(&iscsi_connection_class);
4969         if (err)
4970                 goto unregister_host_class;
4971
4972         err = transport_class_register(&iscsi_session_class);
4973         if (err)
4974                 goto unregister_conn_class;
4975
4976         err = bus_register(&iscsi_flashnode_bus);
4977         if (err)
4978                 goto unregister_session_class;
4979
4980         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4981         if (!nls) {
4982                 err = -ENOBUFS;
4983                 goto unregister_flashnode_bus;
4984         }
4985
4986         iscsi_conn_cleanup_workq = alloc_workqueue("%s",
4987                         WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
4988                         "iscsi_conn_cleanup");
4989         if (!iscsi_conn_cleanup_workq) {
4990                 err = -ENOMEM;
4991                 goto release_nls;
4992         }
4993
4994         return 0;
4995
4996 release_nls:
4997         netlink_kernel_release(nls);
4998 unregister_flashnode_bus:
4999         bus_unregister(&iscsi_flashnode_bus);
5000 unregister_session_class:
5001         transport_class_unregister(&iscsi_session_class);
5002 unregister_conn_class:
5003         transport_class_unregister(&iscsi_connection_class);
5004 unregister_host_class:
5005         transport_class_unregister(&iscsi_host_class);
5006 unregister_iface_class:
5007         class_unregister(&iscsi_iface_class);
5008 unregister_endpoint_class:
5009         class_unregister(&iscsi_endpoint_class);
5010 unregister_transport_class:
5011         class_unregister(&iscsi_transport_class);
5012         return err;
5013 }
5014
5015 static void __exit iscsi_transport_exit(void)
5016 {
5017         destroy_workqueue(iscsi_conn_cleanup_workq);
5018         netlink_kernel_release(nls);
5019         bus_unregister(&iscsi_flashnode_bus);
5020         transport_class_unregister(&iscsi_connection_class);
5021         transport_class_unregister(&iscsi_session_class);
5022         transport_class_unregister(&iscsi_host_class);
5023         class_unregister(&iscsi_endpoint_class);
5024         class_unregister(&iscsi_iface_class);
5025         class_unregister(&iscsi_transport_class);
5026 }
5027
5028 module_init(iscsi_transport_init);
5029 module_exit(iscsi_transport_exit);
5030
5031 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
5032               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
5033               "Alex Aizman <itn780@yahoo.com>");
5034 MODULE_DESCRIPTION("iSCSI Transport Interface");
5035 MODULE_LICENSE("GPL");
5036 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
5037 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);