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