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