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 /* Worker to perform connection failure on unresponsive connections
  90  * completely in kernel space.
  91  */
  92 static void stop_conn_work_fn(struct work_struct *work);
  93 static DECLARE_WORK(stop_conn_work, stop_conn_work_fn);
  94
  95 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  96 static struct workqueue_struct *iscsi_eh_timer_workq;
  97
  98 static struct workqueue_struct *iscsi_destroy_workq;
  99
 100 static DEFINE_IDA(iscsi_sess_ida);
 101 /*
 102  * list of registered transports and lock that must
 103  * be held while accessing list. The iscsi_transport_lock must
 104  * be acquired after the rx_queue_mutex.
 105  */
 106 static LIST_HEAD(iscsi_transports);
 107 static DEFINE_SPINLOCK(iscsi_transport_lock);
 108
 109 #define to_iscsi_internal(tmpl) \
 110         container_of(tmpl, struct iscsi_internal, t)
 111
 112 #define dev_to_iscsi_internal(_dev) \
 113         container_of(_dev, struct iscsi_internal, dev)
 114
 115 static void iscsi_transport_release(struct device *dev)
 116 {
 117         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 118         kfree(priv);
 119 }
 120
 121 /*
 122  * iscsi_transport_class represents the iscsi_transports that are
 123  * registered.
 124  */
 125 static struct class iscsi_transport_class = {
 126         .name = "iscsi_transport",
 127         .dev_release = iscsi_transport_release,
 128 };
 129
 130 static ssize_t
 131 show_transport_handle(struct device *dev, struct device_attribute *attr,
 132                       char *buf)
 133 {
 134         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 135         return sprintf(buf, "%llu\n", (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 sprintf(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         kfree(ep);
 175 }
 176
 177 static struct class iscsi_endpoint_class = {
 178         .name = "iscsi_endpoint",
 179         .dev_release = iscsi_endpoint_release,
 180 };
 181
 182 static ssize_t
 183 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 184 {
 185         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 186         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 187 }
 188 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 189
 190 static struct attribute *iscsi_endpoint_attrs[] = {
 191         &dev_attr_ep_handle.attr,
 192         NULL,
 193 };
 194
 195 static struct attribute_group iscsi_endpoint_group = {
 196         .attrs = iscsi_endpoint_attrs,
 197 };
 198
 199 #define ISCSI_MAX_EPID -1
 200
 201 static int iscsi_match_epid(struct device *dev, const void *data)
 202 {
 203         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 204         const uint64_t *epid = data;
 205
 206         return *epid == ep->id;
 207 }
 208
 209 struct iscsi_endpoint *
 210 iscsi_create_endpoint(int dd_size)
 211 {
 212         struct device *dev;
 213         struct iscsi_endpoint *ep;
 214         uint64_t id;
 215         int err;
 216
 217         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 218                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 219                                         iscsi_match_epid);
 220                 if (!dev)
 221                         break;
 222                 else
 223                         put_device(dev);
 224         }
 225         if (id == ISCSI_MAX_EPID) {
 226                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 227                        ISCSI_MAX_EPID - 1);
 228                 return NULL;
 229         }
 230
 231         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 232         if (!ep)
 233                 return NULL;
 234
 235         ep->id = id;
 236         ep->dev.class = &iscsi_endpoint_class;
 237         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 238         err = device_register(&ep->dev);
 239         if (err)
 240                 goto free_ep;
 241
 242         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 243         if (err)
 244                 goto unregister_dev;
 245
 246         if (dd_size)
 247                 ep->dd_data = &ep[1];
 248         return ep;
 249
 250 unregister_dev:
 251         device_unregister(&ep->dev);
 252         return NULL;
 253
 254 free_ep:
 255         kfree(ep);
 256         return NULL;
 257 }
 258 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 259
 260 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 261 {
 262         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 263         device_unregister(&ep->dev);
 264 }
 265 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 266
 267 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 268 {
 269         struct iscsi_endpoint *ep;
 270         struct device *dev;
 271
 272         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 273                                 iscsi_match_epid);
 274         if (!dev)
 275                 return NULL;
 276
 277         ep = iscsi_dev_to_endpoint(dev);
 278         /*
 279          * we can drop this now because the interface will prevent
 280          * removals and lookups from racing.
 281          */
 282         put_device(dev);
 283         return ep;
 284 }
 285 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 286
 287 /*
 288  * Interface to display network param to sysfs
 289  */
 290
 291 static void iscsi_iface_release(struct device *dev)
 292 {
 293         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 294         struct device *parent = iface->dev.parent;
 295
 296         kfree(iface);
 297         put_device(parent);
 298 }
 299
 300
 301 static struct class iscsi_iface_class = {
 302         .name = "iscsi_iface",
 303         .dev_release = iscsi_iface_release,
 304 };
 305
 306 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 307 struct device_attribute dev_attr_##_prefix##_##_name =          \
 308         __ATTR(_name, _mode, _show, _store)
 309
 310 /* iface attrs show */
 311 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 312 static ssize_t                                                          \
 313 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 314                      char *buf)                                         \
 315 {                                                                       \
 316         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 317         struct iscsi_transport *t = iface->transport;                   \
 318         return t->get_iface_param(iface, param_type, param, buf);       \
 319 }                                                                       \
 320
 321 #define iscsi_iface_net_attr(type, name, param)                         \
 322         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 323 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 324
 325 #define iscsi_iface_attr(type, name, param)                             \
 326         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 327 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 328
 329 /* generic read only ipv4 attribute */
 330 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 331 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 332 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 333 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 334 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 335                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 336 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 337                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 338 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 339 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 340 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 341                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 342 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 343                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 344 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 345                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 346 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 347                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 348 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 349                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 350 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 351                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 352 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 353                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 354 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 355                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 356 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 357                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 358 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 359
 360 /* generic read only ipv6 attribute */
 361 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 362 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 363                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 364 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 365 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 366                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 367 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 368                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 369 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 370                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 371 iscsi_iface_net_attr(ipv6_iface, router_state,
 372                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 373 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 374                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 375 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 376 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 377 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 378                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 379 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 380 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 381                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 382 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 383                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 384 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 385                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 386 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 387                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 388 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 389                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 390
 391 /* common read only iface attribute */
 392 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 393 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 394 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 395 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 396 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 397 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 398 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 399 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 400 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 401                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 402 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 403 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 404 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 405 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 406 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 407 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 408
 409 /* common iscsi specific settings attributes */
 410 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 411 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 412 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 413 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 414 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 415 iscsi_iface_attr(iface, data_seq_in_order,
 416                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 417 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 418 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 419 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 420 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 421 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 422 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 423 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 424 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 425 iscsi_iface_attr(iface, discovery_auth_optional,
 426                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 427 iscsi_iface_attr(iface, discovery_logout,
 428                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 429 iscsi_iface_attr(iface, strict_login_comp_en,
 430                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 431 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 432
 433 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 434                                           struct attribute *attr, int i)
 435 {
 436         struct device *dev = container_of(kobj, struct device, kobj);
 437         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 438         struct iscsi_transport *t = iface->transport;
 439         int param;
 440         int param_type;
 441
 442         if (attr == &dev_attr_iface_enabled.attr)
 443                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 444         else if (attr == &dev_attr_iface_vlan_id.attr)
 445                 param = ISCSI_NET_PARAM_VLAN_ID;
 446         else if (attr == &dev_attr_iface_vlan_priority.attr)
 447                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 448         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 449                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 450         else if (attr == &dev_attr_iface_mtu.attr)
 451                 param = ISCSI_NET_PARAM_MTU;
 452         else if (attr == &dev_attr_iface_port.attr)
 453                 param = ISCSI_NET_PARAM_PORT;
 454         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 455                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 456         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 457                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 458         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 459                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 460         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 461                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 462         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 463                 param = ISCSI_NET_PARAM_TCP_WSF;
 464         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 465                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 466         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 467                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 468         else if (attr == &dev_attr_iface_cache_id.attr)
 469                 param = ISCSI_NET_PARAM_CACHE_ID;
 470         else if (attr == &dev_attr_iface_redirect_en.attr)
 471                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 472         else if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 473                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 474         else if (attr == &dev_attr_iface_header_digest.attr)
 475                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 476         else if (attr == &dev_attr_iface_data_digest.attr)
 477                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 478         else if (attr == &dev_attr_iface_immediate_data.attr)
 479                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 480         else if (attr == &dev_attr_iface_initial_r2t.attr)
 481                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 482         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 483                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 484         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 485                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 486         else if (attr == &dev_attr_iface_erl.attr)
 487                 param = ISCSI_IFACE_PARAM_ERL;
 488         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 489                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 490         else if (attr == &dev_attr_iface_first_burst_len.attr)
 491                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 492         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 493                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 494         else if (attr == &dev_attr_iface_max_burst_len.attr)
 495                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 496         else if (attr == &dev_attr_iface_chap_auth.attr)
 497                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 498         else if (attr == &dev_attr_iface_bidi_chap.attr)
 499                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 500         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 501                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 502         else if (attr == &dev_attr_iface_discovery_logout.attr)
 503                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 504         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 505                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 506         else if (attr == &dev_attr_iface_initiator_name.attr)
 507                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 508         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 509                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 510                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 511                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 512                         param = ISCSI_NET_PARAM_IPV4_GW;
 513                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 514                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 515                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 516                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 517                 else if (attr ==
 518                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 519                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 520                 else if (attr ==
 521                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 522                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 523                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 524                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 525                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 526                         param = ISCSI_NET_PARAM_IPV4_TOS;
 527                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 528                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 529                 else if (attr ==
 530                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 531                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 532                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 533                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 534                 else if (attr ==
 535                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 536                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 537                 else if (attr ==
 538                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 539                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 540                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 541                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 542                 else if (attr ==
 543                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 544                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 545                 else if (attr ==
 546                          &dev_attr_ipv4_iface_fragment_disable.attr)
 547                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 548                 else if (attr ==
 549                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 550                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 551                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 552                         param = ISCSI_NET_PARAM_IPV4_TTL;
 553                 else
 554                         return 0;
 555         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 556                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 557                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 558                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 559                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 560                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 561                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 562                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 563                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 564                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 565                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 566                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 567                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 568                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 569                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 570                 else if (attr ==
 571                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 572                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 573                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 574                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 575                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 576                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 577                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 578                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 579                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 580                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 581                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 582                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 583                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 584                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 585                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 586                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 587                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 588                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 589                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 590                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 591                 else
 592                         return 0;
 593         } else {
 594                 WARN_ONCE(1, "Invalid iface attr");
 595                 return 0;
 596         }
 597
 598         switch (param) {
 599         case ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO:
 600         case ISCSI_IFACE_PARAM_HDRDGST_EN:
 601         case ISCSI_IFACE_PARAM_DATADGST_EN:
 602         case ISCSI_IFACE_PARAM_IMM_DATA_EN:
 603         case ISCSI_IFACE_PARAM_INITIAL_R2T_EN:
 604         case ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN:
 605         case ISCSI_IFACE_PARAM_PDU_INORDER_EN:
 606         case ISCSI_IFACE_PARAM_ERL:
 607         case ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH:
 608         case ISCSI_IFACE_PARAM_FIRST_BURST:
 609         case ISCSI_IFACE_PARAM_MAX_R2T:
 610         case ISCSI_IFACE_PARAM_MAX_BURST:
 611         case ISCSI_IFACE_PARAM_CHAP_AUTH_EN:
 612         case ISCSI_IFACE_PARAM_BIDI_CHAP_EN:
 613         case ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL:
 614         case ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN:
 615         case ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN:
 616         case ISCSI_IFACE_PARAM_INITIATOR_NAME:
 617                 param_type = ISCSI_IFACE_PARAM;
 618                 break;
 619         default:
 620                 param_type = ISCSI_NET_PARAM;
 621         }
 622
 623         return t->attr_is_visible(param_type, param);
 624 }
 625
 626 static struct attribute *iscsi_iface_attrs[] = {
 627         &dev_attr_iface_enabled.attr,
 628         &dev_attr_iface_vlan_id.attr,
 629         &dev_attr_iface_vlan_priority.attr,
 630         &dev_attr_iface_vlan_enabled.attr,
 631         &dev_attr_ipv4_iface_ipaddress.attr,
 632         &dev_attr_ipv4_iface_gateway.attr,
 633         &dev_attr_ipv4_iface_subnet.attr,
 634         &dev_attr_ipv4_iface_bootproto.attr,
 635         &dev_attr_ipv6_iface_ipaddress.attr,
 636         &dev_attr_ipv6_iface_link_local_addr.attr,
 637         &dev_attr_ipv6_iface_router_addr.attr,
 638         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 639         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 640         &dev_attr_iface_mtu.attr,
 641         &dev_attr_iface_port.attr,
 642         &dev_attr_iface_ipaddress_state.attr,
 643         &dev_attr_iface_delayed_ack_en.attr,
 644         &dev_attr_iface_tcp_nagle_disable.attr,
 645         &dev_attr_iface_tcp_wsf_disable.attr,
 646         &dev_attr_iface_tcp_wsf.attr,
 647         &dev_attr_iface_tcp_timer_scale.attr,
 648         &dev_attr_iface_tcp_timestamp_en.attr,
 649         &dev_attr_iface_cache_id.attr,
 650         &dev_attr_iface_redirect_en.attr,
 651         &dev_attr_iface_def_taskmgmt_tmo.attr,
 652         &dev_attr_iface_header_digest.attr,
 653         &dev_attr_iface_data_digest.attr,
 654         &dev_attr_iface_immediate_data.attr,
 655         &dev_attr_iface_initial_r2t.attr,
 656         &dev_attr_iface_data_seq_in_order.attr,
 657         &dev_attr_iface_data_pdu_in_order.attr,
 658         &dev_attr_iface_erl.attr,
 659         &dev_attr_iface_max_recv_dlength.attr,
 660         &dev_attr_iface_first_burst_len.attr,
 661         &dev_attr_iface_max_outstanding_r2t.attr,
 662         &dev_attr_iface_max_burst_len.attr,
 663         &dev_attr_iface_chap_auth.attr,
 664         &dev_attr_iface_bidi_chap.attr,
 665         &dev_attr_iface_discovery_auth_optional.attr,
 666         &dev_attr_iface_discovery_logout.attr,
 667         &dev_attr_iface_strict_login_comp_en.attr,
 668         &dev_attr_iface_initiator_name.attr,
 669         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 670         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 671         &dev_attr_ipv4_iface_tos_en.attr,
 672         &dev_attr_ipv4_iface_tos.attr,
 673         &dev_attr_ipv4_iface_grat_arp_en.attr,
 674         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 675         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 676         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 677         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 678         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 679         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 680         &dev_attr_ipv4_iface_fragment_disable.attr,
 681         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 682         &dev_attr_ipv4_iface_ttl.attr,
 683         &dev_attr_ipv6_iface_link_local_state.attr,
 684         &dev_attr_ipv6_iface_router_state.attr,
 685         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 686         &dev_attr_ipv6_iface_mld_en.attr,
 687         &dev_attr_ipv6_iface_flow_label.attr,
 688         &dev_attr_ipv6_iface_traffic_class.attr,
 689         &dev_attr_ipv6_iface_hop_limit.attr,
 690         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 691         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 692         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 693         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 694         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 695         NULL,
 696 };
 697
 698 static struct attribute_group iscsi_iface_group = {
 699         .attrs = iscsi_iface_attrs,
 700         .is_visible = iscsi_iface_attr_is_visible,
 701 };
 702
 703 /* convert iscsi_ipaddress_state values to ascii string name */
 704 static const struct {
 705         enum iscsi_ipaddress_state      value;
 706         char                            *name;
 707 } iscsi_ipaddress_state_names[] = {
 708         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 709         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 710         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 711         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 712         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 713         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 714         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 715 };
 716
 717 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 718 {
 719         int i;
 720         char *state = NULL;
 721
 722         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 723                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 724                         state = iscsi_ipaddress_state_names[i].name;
 725                         break;
 726                 }
 727         }
 728         return state;
 729 }
 730 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 731
 732 /* convert iscsi_router_state values to ascii string name */
 733 static const struct {
 734         enum iscsi_router_state value;
 735         char                    *name;
 736 } iscsi_router_state_names[] = {
 737         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 738         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 739         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 740         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 741 };
 742
 743 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 744 {
 745         int i;
 746         char *state = NULL;
 747
 748         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 749                 if (iscsi_router_state_names[i].value == router_state) {
 750                         state = iscsi_router_state_names[i].name;
 751                         break;
 752                 }
 753         }
 754         return state;
 755 }
 756 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 757
 758 struct iscsi_iface *
 759 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 760                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 761 {
 762         struct iscsi_iface *iface;
 763         int err;
 764
 765         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 766         if (!iface)
 767                 return NULL;
 768
 769         iface->transport = transport;
 770         iface->iface_type = iface_type;
 771         iface->iface_num = iface_num;
 772         iface->dev.release = iscsi_iface_release;
 773         iface->dev.class = &iscsi_iface_class;
 774         /* parent reference released in iscsi_iface_release */
 775         iface->dev.parent = get_device(&shost->shost_gendev);
 776         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 777                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 778                              iface_num);
 779         else
 780                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 781                              iface_num);
 782
 783         err = device_register(&iface->dev);
 784         if (err)
 785                 goto free_iface;
 786
 787         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 788         if (err)
 789                 goto unreg_iface;
 790
 791         if (dd_size)
 792                 iface->dd_data = &iface[1];
 793         return iface;
 794
 795 unreg_iface:
 796         device_unregister(&iface->dev);
 797         return NULL;
 798
 799 free_iface:
 800         put_device(iface->dev.parent);
 801         kfree(iface);
 802         return NULL;
 803 }
 804 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 805
 806 void iscsi_destroy_iface(struct iscsi_iface *iface)
 807 {
 808         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 809         device_unregister(&iface->dev);
 810 }
 811 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 812
 813 /*
 814  * Interface to display flash node params to sysfs
 815  */
 816
 817 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 818 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 819         __ATTR(_name, _mode, _show, _store)
 820
 821 /* flash node session attrs show */
 822 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 823 static ssize_t                                                          \
 824 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 825                      char *buf)                                         \
 826 {                                                                       \
 827         struct iscsi_bus_flash_session *fnode_sess =                    \
 828                                         iscsi_dev_to_flash_session(dev);\
 829         struct iscsi_transport *t = fnode_sess->transport;              \
 830         return t->get_flashnode_param(fnode_sess, param, buf);          \
 831 }                                                                       \
 832
 833
 834 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 835         iscsi_flashnode_sess_attr_show(type, name, param)               \
 836 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 837                             show_##type##_##name, NULL);
 838
 839 /* Flash node session attributes */
 840
 841 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 842                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 843 iscsi_flashnode_sess_attr(fnode, discovery_session,
 844                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 845 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 846 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 847 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 848 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 849 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 850                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 851 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 852                           ISCSI_FLASHNODE_PDU_INORDER);
 853 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 854 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 855                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 856 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 857 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 858                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 859 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 860 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 861 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 862 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 863                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 864 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 865 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 866 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 867 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 868 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 869                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 870 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 871 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 872 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 873 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 874                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 875 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 876                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 877 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 878 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 879 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 880 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 881 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 882 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 883 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 884
 885 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 886         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 887         &dev_attr_fnode_discovery_session.attr,
 888         &dev_attr_fnode_portal_type.attr,
 889         &dev_attr_fnode_entry_enable.attr,
 890         &dev_attr_fnode_immediate_data.attr,
 891         &dev_attr_fnode_initial_r2t.attr,
 892         &dev_attr_fnode_data_seq_in_order.attr,
 893         &dev_attr_fnode_data_pdu_in_order.attr,
 894         &dev_attr_fnode_chap_auth.attr,
 895         &dev_attr_fnode_discovery_logout.attr,
 896         &dev_attr_fnode_bidi_chap.attr,
 897         &dev_attr_fnode_discovery_auth_optional.attr,
 898         &dev_attr_fnode_erl.attr,
 899         &dev_attr_fnode_first_burst_len.attr,
 900         &dev_attr_fnode_def_time2wait.attr,
 901         &dev_attr_fnode_def_time2retain.attr,
 902         &dev_attr_fnode_max_outstanding_r2t.attr,
 903         &dev_attr_fnode_isid.attr,
 904         &dev_attr_fnode_tsid.attr,
 905         &dev_attr_fnode_max_burst_len.attr,
 906         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 907         &dev_attr_fnode_targetalias.attr,
 908         &dev_attr_fnode_targetname.attr,
 909         &dev_attr_fnode_tpgt.attr,
 910         &dev_attr_fnode_discovery_parent_idx.attr,
 911         &dev_attr_fnode_discovery_parent_type.attr,
 912         &dev_attr_fnode_chap_in_idx.attr,
 913         &dev_attr_fnode_chap_out_idx.attr,
 914         &dev_attr_fnode_username.attr,
 915         &dev_attr_fnode_username_in.attr,
 916         &dev_attr_fnode_password.attr,
 917         &dev_attr_fnode_password_in.attr,
 918         &dev_attr_fnode_is_boot_target.attr,
 919         NULL,
 920 };
 921
 922 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 923                                                     struct attribute *attr,
 924                                                     int i)
 925 {
 926         struct device *dev = container_of(kobj, struct device, kobj);
 927         struct iscsi_bus_flash_session *fnode_sess =
 928                                                 iscsi_dev_to_flash_session(dev);
 929         struct iscsi_transport *t = fnode_sess->transport;
 930         int param;
 931
 932         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 933                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 934         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 935                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 936         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 937                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 938         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 939                 param = ISCSI_FLASHNODE_ENTRY_EN;
 940         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 941                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 942         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 943                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 944         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 945                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 946         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 947                 param = ISCSI_FLASHNODE_PDU_INORDER;
 948         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 949                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 950         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 951                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 952         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 953                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 954         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 955                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 956         } else if (attr == &dev_attr_fnode_erl.attr) {
 957                 param = ISCSI_FLASHNODE_ERL;
 958         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 959                 param = ISCSI_FLASHNODE_FIRST_BURST;
 960         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 961                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 962         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 963                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 964         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 965                 param = ISCSI_FLASHNODE_MAX_R2T;
 966         } else if (attr == &dev_attr_fnode_isid.attr) {
 967                 param = ISCSI_FLASHNODE_ISID;
 968         } else if (attr == &dev_attr_fnode_tsid.attr) {
 969                 param = ISCSI_FLASHNODE_TSID;
 970         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 971                 param = ISCSI_FLASHNODE_MAX_BURST;
 972         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 973                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 974         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 975                 param = ISCSI_FLASHNODE_ALIAS;
 976         } else if (attr == &dev_attr_fnode_targetname.attr) {
 977                 param = ISCSI_FLASHNODE_NAME;
 978         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 979                 param = ISCSI_FLASHNODE_TPGT;
 980         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 981                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 982         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 983                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 984         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 985                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 986         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 987                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 988         } else if (attr == &dev_attr_fnode_username.attr) {
 989                 param = ISCSI_FLASHNODE_USERNAME;
 990         } else if (attr == &dev_attr_fnode_username_in.attr) {
 991                 param = ISCSI_FLASHNODE_USERNAME_IN;
 992         } else if (attr == &dev_attr_fnode_password.attr) {
 993                 param = ISCSI_FLASHNODE_PASSWORD;
 994         } else if (attr == &dev_attr_fnode_password_in.attr) {
 995                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 996         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 997                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 998         } else {
 999                 WARN_ONCE(1, "Invalid flashnode session attr");
1000                 return 0;
1001         }
1002
1003         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1004 }
1005
1006 static struct attribute_group iscsi_flashnode_sess_attr_group = {
1007         .attrs = iscsi_flashnode_sess_attrs,
1008         .is_visible = iscsi_flashnode_sess_attr_is_visible,
1009 };
1010
1011 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
1012         &iscsi_flashnode_sess_attr_group,
1013         NULL,
1014 };
1015
1016 static void iscsi_flashnode_sess_release(struct device *dev)
1017 {
1018         struct iscsi_bus_flash_session *fnode_sess =
1019                                                 iscsi_dev_to_flash_session(dev);
1020
1021         kfree(fnode_sess->targetname);
1022         kfree(fnode_sess->targetalias);
1023         kfree(fnode_sess->portal_type);
1024         kfree(fnode_sess);
1025 }
1026
1027 static const struct device_type iscsi_flashnode_sess_dev_type = {
1028         .name = "iscsi_flashnode_sess_dev_type",
1029         .groups = iscsi_flashnode_sess_attr_groups,
1030         .release = iscsi_flashnode_sess_release,
1031 };
1032
1033 /* flash node connection attrs show */
1034 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1035 static ssize_t                                                          \
1036 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1037                      char *buf)                                         \
1038 {                                                                       \
1039         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1040         struct iscsi_bus_flash_session *fnode_sess =                    \
1041                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1042         struct iscsi_transport *t = fnode_conn->transport;              \
1043         return t->get_flashnode_param(fnode_sess, param, buf);          \
1044 }                                                                       \
1045
1046
1047 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1048         iscsi_flashnode_conn_attr_show(type, name, param)               \
1049 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1050                             show_##type##_##name, NULL);
1051
1052 /* Flash node connection attributes */
1053
1054 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1055                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1056 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1057 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1058 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1059 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1060                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1061 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1062                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1063 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1064                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1065 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1066                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1067 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1068                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1069 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1070                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1071 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1072 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1073 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1074 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1075                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1076 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1077                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1078 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1079 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1080 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1081 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1082                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1083 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1084                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1085 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1086                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1087 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1088                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1089 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1090 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1091 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1092 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1093
1094 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1095         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1096         &dev_attr_fnode_header_digest.attr,
1097         &dev_attr_fnode_data_digest.attr,
1098         &dev_attr_fnode_snack_req.attr,
1099         &dev_attr_fnode_tcp_timestamp_stat.attr,
1100         &dev_attr_fnode_tcp_nagle_disable.attr,
1101         &dev_attr_fnode_tcp_wsf_disable.attr,
1102         &dev_attr_fnode_tcp_timer_scale.attr,
1103         &dev_attr_fnode_tcp_timestamp_enable.attr,
1104         &dev_attr_fnode_fragment_disable.attr,
1105         &dev_attr_fnode_max_recv_dlength.attr,
1106         &dev_attr_fnode_max_xmit_dlength.attr,
1107         &dev_attr_fnode_keepalive_tmo.attr,
1108         &dev_attr_fnode_port.attr,
1109         &dev_attr_fnode_ipaddress.attr,
1110         &dev_attr_fnode_redirect_ipaddr.attr,
1111         &dev_attr_fnode_max_segment_size.attr,
1112         &dev_attr_fnode_local_port.attr,
1113         &dev_attr_fnode_ipv4_tos.attr,
1114         &dev_attr_fnode_ipv6_traffic_class.attr,
1115         &dev_attr_fnode_ipv6_flow_label.attr,
1116         &dev_attr_fnode_link_local_ipv6.attr,
1117         &dev_attr_fnode_tcp_xmit_wsf.attr,
1118         &dev_attr_fnode_tcp_recv_wsf.attr,
1119         &dev_attr_fnode_statsn.attr,
1120         &dev_attr_fnode_exp_statsn.attr,
1121         NULL,
1122 };
1123
1124 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1125                                                     struct attribute *attr,
1126                                                     int i)
1127 {
1128         struct device *dev = container_of(kobj, struct device, kobj);
1129         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1130         struct iscsi_transport *t = fnode_conn->transport;
1131         int param;
1132
1133         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1134                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1135         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1136                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1137         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1138                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1139         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1140                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1141         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1142                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1143         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1144                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1145         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1146                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1147         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1148                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1149         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1150                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1151         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1152                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1153         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1154                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1155         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1156                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1157         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1158                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1159         } else if (attr == &dev_attr_fnode_port.attr) {
1160                 param = ISCSI_FLASHNODE_PORT;
1161         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1162                 param = ISCSI_FLASHNODE_IPADDR;
1163         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1164                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1165         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1166                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1167         } else if (attr == &dev_attr_fnode_local_port.attr) {
1168                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1169         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1170                 param = ISCSI_FLASHNODE_IPV4_TOS;
1171         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1172                 param = ISCSI_FLASHNODE_IPV6_TC;
1173         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1174                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1175         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1176                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1177         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1178                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1179         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1180                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1181         } else if (attr == &dev_attr_fnode_statsn.attr) {
1182                 param = ISCSI_FLASHNODE_STATSN;
1183         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1184                 param = ISCSI_FLASHNODE_EXP_STATSN;
1185         } else {
1186                 WARN_ONCE(1, "Invalid flashnode connection attr");
1187                 return 0;
1188         }
1189
1190         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1191 }
1192
1193 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1194         .attrs = iscsi_flashnode_conn_attrs,
1195         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1196 };
1197
1198 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1199         &iscsi_flashnode_conn_attr_group,
1200         NULL,
1201 };
1202
1203 static void iscsi_flashnode_conn_release(struct device *dev)
1204 {
1205         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1206
1207         kfree(fnode_conn->ipaddress);
1208         kfree(fnode_conn->redirect_ipaddr);
1209         kfree(fnode_conn->link_local_ipv6_addr);
1210         kfree(fnode_conn);
1211 }
1212
1213 static const struct device_type iscsi_flashnode_conn_dev_type = {
1214         .name = "iscsi_flashnode_conn_dev_type",
1215         .groups = iscsi_flashnode_conn_attr_groups,
1216         .release = iscsi_flashnode_conn_release,
1217 };
1218
1219 static struct bus_type iscsi_flashnode_bus;
1220
1221 int iscsi_flashnode_bus_match(struct device *dev,
1222                                      struct device_driver *drv)
1223 {
1224         if (dev->bus == &iscsi_flashnode_bus)
1225                 return 1;
1226         return 0;
1227 }
1228 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1229
1230 static struct bus_type iscsi_flashnode_bus = {
1231         .name = "iscsi_flashnode",
1232         .match = &iscsi_flashnode_bus_match,
1233 };
1234
1235 /**
1236  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1237  * @shost: pointer to host data
1238  * @index: index of flashnode to add in sysfs
1239  * @transport: pointer to transport data
1240  * @dd_size: total size to allocate
1241  *
1242  * Adds a sysfs entry for the flashnode session attributes
1243  *
1244  * Returns:
1245  *  pointer to allocated flashnode sess on success
1246  *  %NULL on failure
1247  */
1248 struct iscsi_bus_flash_session *
1249 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1250                             struct iscsi_transport *transport,
1251                             int dd_size)
1252 {
1253         struct iscsi_bus_flash_session *fnode_sess;
1254         int err;
1255
1256         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1257         if (!fnode_sess)
1258                 return NULL;
1259
1260         fnode_sess->transport = transport;
1261         fnode_sess->target_id = index;
1262         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1263         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1264         fnode_sess->dev.parent = &shost->shost_gendev;
1265         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1266                      shost->host_no, index);
1267
1268         err = device_register(&fnode_sess->dev);
1269         if (err)
1270                 goto free_fnode_sess;
1271
1272         if (dd_size)
1273                 fnode_sess->dd_data = &fnode_sess[1];
1274
1275         return fnode_sess;
1276
1277 free_fnode_sess:
1278         kfree(fnode_sess);
1279         return NULL;
1280 }
1281 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1282
1283 /**
1284  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1285  * @shost: pointer to host data
1286  * @fnode_sess: pointer to the parent flashnode session entry
1287  * @transport: pointer to transport data
1288  * @dd_size: total size to allocate
1289  *
1290  * Adds a sysfs entry for the flashnode connection attributes
1291  *
1292  * Returns:
1293  *  pointer to allocated flashnode conn on success
1294  *  %NULL on failure
1295  */
1296 struct iscsi_bus_flash_conn *
1297 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1298                             struct iscsi_bus_flash_session *fnode_sess,
1299                             struct iscsi_transport *transport,
1300                             int dd_size)
1301 {
1302         struct iscsi_bus_flash_conn *fnode_conn;
1303         int err;
1304
1305         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1306         if (!fnode_conn)
1307                 return NULL;
1308
1309         fnode_conn->transport = transport;
1310         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1311         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1312         fnode_conn->dev.parent = &fnode_sess->dev;
1313         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1314                      shost->host_no, fnode_sess->target_id);
1315
1316         err = device_register(&fnode_conn->dev);
1317         if (err)
1318                 goto free_fnode_conn;
1319
1320         if (dd_size)
1321                 fnode_conn->dd_data = &fnode_conn[1];
1322
1323         return fnode_conn;
1324
1325 free_fnode_conn:
1326         kfree(fnode_conn);
1327         return NULL;
1328 }
1329 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1330
1331 /**
1332  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1333  * @dev: device to verify
1334  * @data: pointer to data containing value to use for verification
1335  *
1336  * Verifies if the passed device is flashnode conn device
1337  *
1338  * Returns:
1339  *  1 on success
1340  *  0 on failure
1341  */
1342 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1343 {
1344         return dev->bus == &iscsi_flashnode_bus;
1345 }
1346
1347 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1348 {
1349         device_unregister(&fnode_conn->dev);
1350         return 0;
1351 }
1352
1353 static int flashnode_match_index(struct device *dev, void *data)
1354 {
1355         struct iscsi_bus_flash_session *fnode_sess = NULL;
1356         int ret = 0;
1357
1358         if (!iscsi_flashnode_bus_match(dev, NULL))
1359                 goto exit_match_index;
1360
1361         fnode_sess = iscsi_dev_to_flash_session(dev);
1362         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1363
1364 exit_match_index:
1365         return ret;
1366 }
1367
1368 /**
1369  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1370  * @shost: pointer to host data
1371  * @idx: index to match
1372  *
1373  * Finds the flashnode session object for the passed index
1374  *
1375  * Returns:
1376  *  pointer to found flashnode session object on success
1377  *  %NULL on failure
1378  */
1379 static struct iscsi_bus_flash_session *
1380 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1381 {
1382         struct iscsi_bus_flash_session *fnode_sess = NULL;
1383         struct device *dev;
1384
1385         dev = device_find_child(&shost->shost_gendev, &idx,
1386                                 flashnode_match_index);
1387         if (dev)
1388                 fnode_sess = iscsi_dev_to_flash_session(dev);
1389
1390         return fnode_sess;
1391 }
1392
1393 /**
1394  * iscsi_find_flashnode_sess - finds flashnode session entry
1395  * @shost: pointer to host data
1396  * @data: pointer to data containing value to use for comparison
1397  * @fn: function pointer that does actual comparison
1398  *
1399  * Finds the flashnode session object comparing the data passed using logic
1400  * defined in passed function pointer
1401  *
1402  * Returns:
1403  *  pointer to found flashnode session device object on success
1404  *  %NULL on failure
1405  */
1406 struct device *
1407 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1408                           int (*fn)(struct device *dev, void *data))
1409 {
1410         return device_find_child(&shost->shost_gendev, data, fn);
1411 }
1412 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1413
1414 /**
1415  * iscsi_find_flashnode_conn - finds flashnode connection entry
1416  * @fnode_sess: pointer to parent flashnode session entry
1417  *
1418  * Finds the flashnode connection object comparing the data passed using logic
1419  * defined in passed function pointer
1420  *
1421  * Returns:
1422  *  pointer to found flashnode connection device object on success
1423  *  %NULL on failure
1424  */
1425 struct device *
1426 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1427 {
1428         return device_find_child(&fnode_sess->dev, NULL,
1429                                  iscsi_is_flashnode_conn_dev);
1430 }
1431 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1432
1433 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1434 {
1435         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1436                 return 0;
1437
1438         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1439 }
1440
1441 /**
1442  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1443  * @fnode_sess: pointer to flashnode session entry to be destroyed
1444  *
1445  * Deletes the flashnode session entry and all children flashnode connection
1446  * entries from sysfs
1447  */
1448 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1449 {
1450         int err;
1451
1452         err = device_for_each_child(&fnode_sess->dev, NULL,
1453                                     iscsi_iter_destroy_flashnode_conn_fn);
1454         if (err)
1455                 pr_err("Could not delete all connections for %s. Error %d.\n",
1456                        fnode_sess->dev.kobj.name, err);
1457
1458         device_unregister(&fnode_sess->dev);
1459 }
1460 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1461
1462 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1463 {
1464         if (!iscsi_flashnode_bus_match(dev, NULL))
1465                 return 0;
1466
1467         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1468         return 0;
1469 }
1470
1471 /**
1472  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1473  * @shost: pointer to host data
1474  *
1475  * Destroys all the flashnode session entries and all corresponding children
1476  * flashnode connection entries from sysfs
1477  */
1478 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1479 {
1480         device_for_each_child(&shost->shost_gendev, NULL,
1481                               iscsi_iter_destroy_flashnode_fn);
1482 }
1483 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1484
1485 /*
1486  * BSG support
1487  */
1488 /**
1489  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1490  * @job: bsg job to be processed
1491  */
1492 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1493 {
1494         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1495         struct iscsi_bsg_request *req = job->request;
1496         struct iscsi_bsg_reply *reply = job->reply;
1497         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1498         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1499         int ret;
1500
1501         /* check if we have the msgcode value at least */
1502         if (job->request_len < sizeof(uint32_t)) {
1503                 ret = -ENOMSG;
1504                 goto fail_host_msg;
1505         }
1506
1507         /* Validate the host command */
1508         switch (req->msgcode) {
1509         case ISCSI_BSG_HST_VENDOR:
1510                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1511                 if ((shost->hostt->vendor_id == 0L) ||
1512                     (req->rqst_data.h_vendor.vendor_id !=
1513                         shost->hostt->vendor_id)) {
1514                         ret = -ESRCH;
1515                         goto fail_host_msg;
1516                 }
1517                 break;
1518         default:
1519                 ret = -EBADR;
1520                 goto fail_host_msg;
1521         }
1522
1523         /* check if we really have all the request data needed */
1524         if (job->request_len < cmdlen) {
1525                 ret = -ENOMSG;
1526                 goto fail_host_msg;
1527         }
1528
1529         ret = i->iscsi_transport->bsg_request(job);
1530         if (!ret)
1531                 return 0;
1532
1533 fail_host_msg:
1534         /* return the errno failure code as the only status */
1535         BUG_ON(job->reply_len < sizeof(uint32_t));
1536         reply->reply_payload_rcv_len = 0;
1537         reply->result = ret;
1538         job->reply_len = sizeof(uint32_t);
1539         bsg_job_done(job, ret, 0);
1540         return 0;
1541 }
1542
1543 /**
1544  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1545  * @shost: shost for iscsi_host
1546  * @ihost: iscsi_cls_host adding the structures to
1547  */
1548 static int
1549 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1550 {
1551         struct device *dev = &shost->shost_gendev;
1552         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1553         struct request_queue *q;
1554         char bsg_name[20];
1555
1556         if (!i->iscsi_transport->bsg_request)
1557                 return -ENOTSUPP;
1558
1559         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1560         q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1561         if (IS_ERR(q)) {
1562                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1563                              "initialize - no request queue\n");
1564                 return PTR_ERR(q);
1565         }
1566         __scsi_init_queue(shost, q);
1567
1568         ihost->bsg_q = q;
1569         return 0;
1570 }
1571
1572 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1573                             struct device *cdev)
1574 {
1575         struct Scsi_Host *shost = dev_to_shost(dev);
1576         struct iscsi_cls_host *ihost = shost->shost_data;
1577
1578         memset(ihost, 0, sizeof(*ihost));
1579         atomic_set(&ihost->nr_scans, 0);
1580         mutex_init(&ihost->mutex);
1581
1582         iscsi_bsg_host_add(shost, ihost);
1583         /* ignore any bsg add error - we just can't do sgio */
1584
1585         return 0;
1586 }
1587
1588 static int iscsi_remove_host(struct transport_container *tc,
1589                              struct device *dev, struct device *cdev)
1590 {
1591         struct Scsi_Host *shost = dev_to_shost(dev);
1592         struct iscsi_cls_host *ihost = shost->shost_data;
1593
1594         bsg_remove_queue(ihost->bsg_q);
1595         return 0;
1596 }
1597
1598 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1599                                "iscsi_host",
1600                                iscsi_setup_host,
1601                                iscsi_remove_host,
1602                                NULL);
1603
1604 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1605                                "iscsi_session",
1606                                NULL,
1607                                NULL,
1608                                NULL);
1609
1610 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1611                                "iscsi_connection",
1612                                NULL,
1613                                NULL,
1614                                NULL);
1615
1616 static struct sock *nls;
1617 static DEFINE_MUTEX(rx_queue_mutex);
1618
1619 /*
1620  * conn_mutex protects the {start,bind,stop,destroy}_conn from racing
1621  * against the kernel stop_connection recovery mechanism
1622  */
1623 static DEFINE_MUTEX(conn_mutex);
1624
1625 static LIST_HEAD(sesslist);
1626 static DEFINE_SPINLOCK(sesslock);
1627 static LIST_HEAD(connlist);
1628 static LIST_HEAD(connlist_err);
1629 static DEFINE_SPINLOCK(connlock);
1630
1631 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1632 {
1633         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1634         return sess->sid;
1635 }
1636
1637 /*
1638  * Returns the matching session to a given sid
1639  */
1640 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1641 {
1642         unsigned long flags;
1643         struct iscsi_cls_session *sess;
1644
1645         spin_lock_irqsave(&sesslock, flags);
1646         list_for_each_entry(sess, &sesslist, sess_list) {
1647                 if (sess->sid == sid) {
1648                         spin_unlock_irqrestore(&sesslock, flags);
1649                         return sess;
1650                 }
1651         }
1652         spin_unlock_irqrestore(&sesslock, flags);
1653         return NULL;
1654 }
1655
1656 /*
1657  * Returns the matching connection to a given sid / cid tuple
1658  */
1659 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1660 {
1661         unsigned long flags;
1662         struct iscsi_cls_conn *conn;
1663
1664         spin_lock_irqsave(&connlock, flags);
1665         list_for_each_entry(conn, &connlist, conn_list) {
1666                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1667                         spin_unlock_irqrestore(&connlock, flags);
1668                         return conn;
1669                 }
1670         }
1671         spin_unlock_irqrestore(&connlock, flags);
1672         return NULL;
1673 }
1674
1675 /*
1676  * The following functions can be used by LLDs that allocate
1677  * their own scsi_hosts or by software iscsi LLDs
1678  */
1679 static struct {
1680         int value;
1681         char *name;
1682 } iscsi_session_state_names[] = {
1683         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1684         { ISCSI_SESSION_FAILED,         "FAILED" },
1685         { ISCSI_SESSION_FREE,           "FREE" },
1686 };
1687
1688 static const char *iscsi_session_state_name(int state)
1689 {
1690         int i;
1691         char *name = NULL;
1692
1693         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1694                 if (iscsi_session_state_names[i].value == state) {
1695                         name = iscsi_session_state_names[i].name;
1696                         break;
1697                 }
1698         }
1699         return name;
1700 }
1701
1702 int iscsi_session_chkready(struct iscsi_cls_session *session)
1703 {
1704         unsigned long flags;
1705         int err;
1706
1707         spin_lock_irqsave(&session->lock, flags);
1708         switch (session->state) {
1709         case ISCSI_SESSION_LOGGED_IN:
1710                 err = 0;
1711                 break;
1712         case ISCSI_SESSION_FAILED:
1713                 err = DID_IMM_RETRY << 16;
1714                 break;
1715         case ISCSI_SESSION_FREE:
1716                 err = DID_TRANSPORT_FAILFAST << 16;
1717                 break;
1718         default:
1719                 err = DID_NO_CONNECT << 16;
1720                 break;
1721         }
1722         spin_unlock_irqrestore(&session->lock, flags);
1723         return err;
1724 }
1725 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1726
1727 int iscsi_is_session_online(struct iscsi_cls_session *session)
1728 {
1729         unsigned long flags;
1730         int ret = 0;
1731
1732         spin_lock_irqsave(&session->lock, flags);
1733         if (session->state == ISCSI_SESSION_LOGGED_IN)
1734                 ret = 1;
1735         spin_unlock_irqrestore(&session->lock, flags);
1736         return ret;
1737 }
1738 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1739
1740 static void iscsi_session_release(struct device *dev)
1741 {
1742         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1743         struct Scsi_Host *shost;
1744
1745         shost = iscsi_session_to_shost(session);
1746         scsi_host_put(shost);
1747         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1748         kfree(session);
1749 }
1750
1751 int iscsi_is_session_dev(const struct device *dev)
1752 {
1753         return dev->release == iscsi_session_release;
1754 }
1755 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1756
1757 static int iscsi_iter_session_fn(struct device *dev, void *data)
1758 {
1759         void (* fn) (struct iscsi_cls_session *) = data;
1760
1761         if (!iscsi_is_session_dev(dev))
1762                 return 0;
1763         fn(iscsi_dev_to_session(dev));
1764         return 0;
1765 }
1766
1767 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1768                                  void (*fn)(struct iscsi_cls_session *))
1769 {
1770         device_for_each_child(&shost->shost_gendev, fn,
1771                               iscsi_iter_session_fn);
1772 }
1773 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1774
1775 /**
1776  * iscsi_scan_finished - helper to report when running scans are done
1777  * @shost: scsi host
1778  * @time: scan run time
1779  *
1780  * This function can be used by drives like qla4xxx to report to the scsi
1781  * layer when the scans it kicked off at module load time are done.
1782  */
1783 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1784 {
1785         struct iscsi_cls_host *ihost = shost->shost_data;
1786         /*
1787          * qla4xxx will have kicked off some session unblocks before calling
1788          * scsi_scan_host, so just wait for them to complete.
1789          */
1790         return !atomic_read(&ihost->nr_scans);
1791 }
1792 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1793
1794 struct iscsi_scan_data {
1795         unsigned int channel;
1796         unsigned int id;
1797         u64 lun;
1798         enum scsi_scan_mode rescan;
1799 };
1800
1801 static int iscsi_user_scan_session(struct device *dev, void *data)
1802 {
1803         struct iscsi_scan_data *scan_data = data;
1804         struct iscsi_cls_session *session;
1805         struct Scsi_Host *shost;
1806         struct iscsi_cls_host *ihost;
1807         unsigned long flags;
1808         unsigned int id;
1809
1810         if (!iscsi_is_session_dev(dev))
1811                 return 0;
1812
1813         session = iscsi_dev_to_session(dev);
1814
1815         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1816
1817         shost = iscsi_session_to_shost(session);
1818         ihost = shost->shost_data;
1819
1820         mutex_lock(&ihost->mutex);
1821         spin_lock_irqsave(&session->lock, flags);
1822         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1823                 spin_unlock_irqrestore(&session->lock, flags);
1824                 goto user_scan_exit;
1825         }
1826         id = session->target_id;
1827         spin_unlock_irqrestore(&session->lock, flags);
1828
1829         if (id != ISCSI_MAX_TARGET) {
1830                 if ((scan_data->channel == SCAN_WILD_CARD ||
1831                      scan_data->channel == 0) &&
1832                     (scan_data->id == SCAN_WILD_CARD ||
1833                      scan_data->id == id))
1834                         scsi_scan_target(&session->dev, 0, id,
1835                                          scan_data->lun, scan_data->rescan);
1836         }
1837
1838 user_scan_exit:
1839         mutex_unlock(&ihost->mutex);
1840         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1841         return 0;
1842 }
1843
1844 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1845                            uint id, u64 lun)
1846 {
1847         struct iscsi_scan_data scan_data;
1848
1849         scan_data.channel = channel;
1850         scan_data.id = id;
1851         scan_data.lun = lun;
1852         scan_data.rescan = SCSI_SCAN_MANUAL;
1853
1854         return device_for_each_child(&shost->shost_gendev, &scan_data,
1855                                      iscsi_user_scan_session);
1856 }
1857
1858 static void iscsi_scan_session(struct work_struct *work)
1859 {
1860         struct iscsi_cls_session *session =
1861                         container_of(work, struct iscsi_cls_session, scan_work);
1862         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1863         struct iscsi_cls_host *ihost = shost->shost_data;
1864         struct iscsi_scan_data scan_data;
1865
1866         scan_data.channel = 0;
1867         scan_data.id = SCAN_WILD_CARD;
1868         scan_data.lun = SCAN_WILD_CARD;
1869         scan_data.rescan = SCSI_SCAN_RESCAN;
1870
1871         iscsi_user_scan_session(&session->dev, &scan_data);
1872         atomic_dec(&ihost->nr_scans);
1873 }
1874
1875 /**
1876  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1877  * @cmd: scsi cmd passed to scsi eh handler
1878  *
1879  * If the session is down this function will wait for the recovery
1880  * timer to fire or for the session to be logged back in. If the
1881  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1882  * should pass this error value to the scsi eh.
1883  */
1884 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1885 {
1886         struct iscsi_cls_session *session =
1887                         starget_to_session(scsi_target(cmd->device));
1888         unsigned long flags;
1889         int ret = 0;
1890
1891         spin_lock_irqsave(&session->lock, flags);
1892         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1893                 if (session->state == ISCSI_SESSION_FREE) {
1894                         ret = FAST_IO_FAIL;
1895                         break;
1896                 }
1897                 spin_unlock_irqrestore(&session->lock, flags);
1898                 msleep(1000);
1899                 spin_lock_irqsave(&session->lock, flags);
1900         }
1901         spin_unlock_irqrestore(&session->lock, flags);
1902         return ret;
1903 }
1904 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1905
1906 static void session_recovery_timedout(struct work_struct *work)
1907 {
1908         struct iscsi_cls_session *session =
1909                 container_of(work, struct iscsi_cls_session,
1910                              recovery_work.work);
1911         unsigned long flags;
1912
1913         iscsi_cls_session_printk(KERN_INFO, session,
1914                                  "session recovery timed out after %d secs\n",
1915                                  session->recovery_tmo);
1916
1917         spin_lock_irqsave(&session->lock, flags);
1918         switch (session->state) {
1919         case ISCSI_SESSION_FAILED:
1920                 session->state = ISCSI_SESSION_FREE;
1921                 break;
1922         case ISCSI_SESSION_LOGGED_IN:
1923         case ISCSI_SESSION_FREE:
1924                 /* we raced with the unblock's flush */
1925                 spin_unlock_irqrestore(&session->lock, flags);
1926                 return;
1927         }
1928         spin_unlock_irqrestore(&session->lock, flags);
1929
1930         if (session->transport->session_recovery_timedout)
1931                 session->transport->session_recovery_timedout(session);
1932
1933         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1934         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1935         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1936 }
1937
1938 static void __iscsi_unblock_session(struct work_struct *work)
1939 {
1940         struct iscsi_cls_session *session =
1941                         container_of(work, struct iscsi_cls_session,
1942                                      unblock_work);
1943         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1944         struct iscsi_cls_host *ihost = shost->shost_data;
1945         unsigned long flags;
1946
1947         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1948         /*
1949          * The recovery and unblock work get run from the same workqueue,
1950          * so try to cancel it if it was going to run after this unblock.
1951          */
1952         cancel_delayed_work(&session->recovery_work);
1953         spin_lock_irqsave(&session->lock, flags);
1954         session->state = ISCSI_SESSION_LOGGED_IN;
1955         spin_unlock_irqrestore(&session->lock, flags);
1956         /* start IO */
1957         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1958         /*
1959          * Only do kernel scanning if the driver is properly hooked into
1960          * the async scanning code (drivers like iscsi_tcp do login and
1961          * scanning from userspace).
1962          */
1963         if (shost->hostt->scan_finished) {
1964                 if (scsi_queue_work(shost, &session->scan_work))
1965                         atomic_inc(&ihost->nr_scans);
1966         }
1967         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1968 }
1969
1970 /**
1971  * iscsi_unblock_session - set a session as logged in and start IO.
1972  * @session: iscsi session
1973  *
1974  * Mark a session as ready to accept IO.
1975  */
1976 void iscsi_unblock_session(struct iscsi_cls_session *session)
1977 {
1978         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1979         /*
1980          * Blocking the session can be done from any context so we only
1981          * queue the block work. Make sure the unblock work has completed
1982          * because it flushes/cancels the other works and updates the state.
1983          */
1984         flush_work(&session->unblock_work);
1985 }
1986 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1987
1988 static void __iscsi_block_session(struct work_struct *work)
1989 {
1990         struct iscsi_cls_session *session =
1991                         container_of(work, struct iscsi_cls_session,
1992                                      block_work);
1993         unsigned long flags;
1994
1995         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1996         spin_lock_irqsave(&session->lock, flags);
1997         session->state = ISCSI_SESSION_FAILED;
1998         spin_unlock_irqrestore(&session->lock, flags);
1999         scsi_target_block(&session->dev);
2000         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
2001         if (session->recovery_tmo >= 0)
2002                 queue_delayed_work(iscsi_eh_timer_workq,
2003                                    &session->recovery_work,
2004                                    session->recovery_tmo * HZ);
2005 }
2006
2007 void iscsi_block_session(struct iscsi_cls_session *session)
2008 {
2009         queue_work(iscsi_eh_timer_workq, &session->block_work);
2010 }
2011 EXPORT_SYMBOL_GPL(iscsi_block_session);
2012
2013 static void __iscsi_unbind_session(struct work_struct *work)
2014 {
2015         struct iscsi_cls_session *session =
2016                         container_of(work, struct iscsi_cls_session,
2017                                      unbind_work);
2018         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2019         struct iscsi_cls_host *ihost = shost->shost_data;
2020         unsigned long flags;
2021         unsigned int target_id;
2022
2023         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2024
2025         /* Prevent new scans and make sure scanning is not in progress */
2026         mutex_lock(&ihost->mutex);
2027         spin_lock_irqsave(&session->lock, flags);
2028         if (session->target_id == ISCSI_MAX_TARGET) {
2029                 spin_unlock_irqrestore(&session->lock, flags);
2030                 mutex_unlock(&ihost->mutex);
2031                 goto unbind_session_exit;
2032         }
2033
2034         target_id = session->target_id;
2035         session->target_id = ISCSI_MAX_TARGET;
2036         spin_unlock_irqrestore(&session->lock, flags);
2037         mutex_unlock(&ihost->mutex);
2038
2039         scsi_remove_target(&session->dev);
2040
2041         if (session->ida_used)
2042                 ida_simple_remove(&iscsi_sess_ida, target_id);
2043
2044 unbind_session_exit:
2045         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2046         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2047 }
2048
2049 static void __iscsi_destroy_session(struct work_struct *work)
2050 {
2051         struct iscsi_cls_session *session =
2052                 container_of(work, struct iscsi_cls_session, destroy_work);
2053
2054         session->transport->destroy_session(session);
2055 }
2056
2057 struct iscsi_cls_session *
2058 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2059                     int dd_size)
2060 {
2061         struct iscsi_cls_session *session;
2062
2063         session = kzalloc(sizeof(*session) + dd_size,
2064                           GFP_KERNEL);
2065         if (!session)
2066                 return NULL;
2067
2068         session->transport = transport;
2069         session->creator = -1;
2070         session->recovery_tmo = 120;
2071         session->recovery_tmo_sysfs_override = false;
2072         session->state = ISCSI_SESSION_FREE;
2073         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2074         INIT_LIST_HEAD(&session->sess_list);
2075         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2076         INIT_WORK(&session->block_work, __iscsi_block_session);
2077         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2078         INIT_WORK(&session->scan_work, iscsi_scan_session);
2079         INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2080         spin_lock_init(&session->lock);
2081
2082         /* this is released in the dev's release function */
2083         scsi_host_get(shost);
2084         session->dev.parent = &shost->shost_gendev;
2085         session->dev.release = iscsi_session_release;
2086         device_initialize(&session->dev);
2087         if (dd_size)
2088                 session->dd_data = &session[1];
2089
2090         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2091         return session;
2092 }
2093 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2094
2095 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2096 {
2097         unsigned long flags;
2098         int id = 0;
2099         int err;
2100
2101         session->sid = atomic_add_return(1, &iscsi_session_nr);
2102
2103         if (target_id == ISCSI_MAX_TARGET) {
2104                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2105
2106                 if (id < 0) {
2107                         iscsi_cls_session_printk(KERN_ERR, session,
2108                                         "Failure in Target ID Allocation\n");
2109                         return id;
2110                 }
2111                 session->target_id = (unsigned int)id;
2112                 session->ida_used = true;
2113         } else
2114                 session->target_id = target_id;
2115
2116         dev_set_name(&session->dev, "session%u", session->sid);
2117         err = device_add(&session->dev);
2118         if (err) {
2119                 iscsi_cls_session_printk(KERN_ERR, session,
2120                                          "could not register session's dev\n");
2121                 goto release_ida;
2122         }
2123         err = transport_register_device(&session->dev);
2124         if (err) {
2125                 iscsi_cls_session_printk(KERN_ERR, session,
2126                                          "could not register transport's dev\n");
2127                 goto release_dev;
2128         }
2129
2130         spin_lock_irqsave(&sesslock, flags);
2131         list_add(&session->sess_list, &sesslist);
2132         spin_unlock_irqrestore(&sesslock, flags);
2133
2134         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2135         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2136         return 0;
2137
2138 release_dev:
2139         device_del(&session->dev);
2140 release_ida:
2141         if (session->ida_used)
2142                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2143
2144         return err;
2145 }
2146 EXPORT_SYMBOL_GPL(iscsi_add_session);
2147
2148 /**
2149  * iscsi_create_session - create iscsi class session
2150  * @shost: scsi host
2151  * @transport: iscsi transport
2152  * @dd_size: private driver data size
2153  * @target_id: which target
2154  *
2155  * This can be called from a LLD or iscsi_transport.
2156  */
2157 struct iscsi_cls_session *
2158 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2159                      int dd_size, unsigned int target_id)
2160 {
2161         struct iscsi_cls_session *session;
2162
2163         session = iscsi_alloc_session(shost, transport, dd_size);
2164         if (!session)
2165                 return NULL;
2166
2167         if (iscsi_add_session(session, target_id)) {
2168                 iscsi_free_session(session);
2169                 return NULL;
2170         }
2171         return session;
2172 }
2173 EXPORT_SYMBOL_GPL(iscsi_create_session);
2174
2175 static void iscsi_conn_release(struct device *dev)
2176 {
2177         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2178         struct device *parent = conn->dev.parent;
2179
2180         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2181         kfree(conn);
2182         put_device(parent);
2183 }
2184
2185 static int iscsi_is_conn_dev(const struct device *dev)
2186 {
2187         return dev->release == iscsi_conn_release;
2188 }
2189
2190 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2191 {
2192         if (!iscsi_is_conn_dev(dev))
2193                 return 0;
2194         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2195 }
2196
2197 void iscsi_remove_session(struct iscsi_cls_session *session)
2198 {
2199         unsigned long flags;
2200         int err;
2201
2202         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2203
2204         spin_lock_irqsave(&sesslock, flags);
2205         if (!list_empty(&session->sess_list))
2206                 list_del(&session->sess_list);
2207         spin_unlock_irqrestore(&sesslock, flags);
2208
2209         flush_work(&session->block_work);
2210         flush_work(&session->unblock_work);
2211         cancel_delayed_work_sync(&session->recovery_work);
2212         /*
2213          * If we are blocked let commands flow again. The lld or iscsi
2214          * layer should set up the queuecommand to fail commands.
2215          * We assume that LLD will not be calling block/unblock while
2216          * removing the session.
2217          */
2218         spin_lock_irqsave(&session->lock, flags);
2219         session->state = ISCSI_SESSION_FREE;
2220         spin_unlock_irqrestore(&session->lock, flags);
2221
2222         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2223         /* flush running scans then delete devices */
2224         flush_work(&session->scan_work);
2225         /* flush running unbind operations */
2226         flush_work(&session->unbind_work);
2227         __iscsi_unbind_session(&session->unbind_work);
2228
2229         /* hw iscsi may not have removed all connections from session */
2230         err = device_for_each_child(&session->dev, NULL,
2231                                     iscsi_iter_destroy_conn_fn);
2232         if (err)
2233                 iscsi_cls_session_printk(KERN_ERR, session,
2234                                          "Could not delete all connections "
2235                                          "for session. Error %d.\n", err);
2236
2237         transport_unregister_device(&session->dev);
2238
2239         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2240         device_del(&session->dev);
2241 }
2242 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2243
2244 void iscsi_free_session(struct iscsi_cls_session *session)
2245 {
2246         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2247         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2248         put_device(&session->dev);
2249 }
2250 EXPORT_SYMBOL_GPL(iscsi_free_session);
2251
2252 /**
2253  * iscsi_create_conn - create iscsi class connection
2254  * @session: iscsi cls session
2255  * @dd_size: private driver data size
2256  * @cid: connection id
2257  *
2258  * This can be called from a LLD or iscsi_transport. The connection
2259  * is child of the session so cid must be unique for all connections
2260  * on the session.
2261  *
2262  * Since we do not support MCS, cid will normally be zero. In some cases
2263  * for software iscsi we could be trying to preallocate a connection struct
2264  * in which case there could be two connection structs and cid would be
2265  * non-zero.
2266  */
2267 struct iscsi_cls_conn *
2268 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2269 {
2270         struct iscsi_transport *transport = session->transport;
2271         struct iscsi_cls_conn *conn;
2272         unsigned long flags;
2273         int err;
2274
2275         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2276         if (!conn)
2277                 return NULL;
2278         if (dd_size)
2279                 conn->dd_data = &conn[1];
2280
2281         mutex_init(&conn->ep_mutex);
2282         INIT_LIST_HEAD(&conn->conn_list);
2283         INIT_LIST_HEAD(&conn->conn_list_err);
2284         conn->transport = transport;
2285         conn->cid = cid;
2286         conn->state = ISCSI_CONN_DOWN;
2287
2288         /* this is released in the dev's release function */
2289         if (!get_device(&session->dev))
2290                 goto free_conn;
2291
2292         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2293         conn->dev.parent = &session->dev;
2294         conn->dev.release = iscsi_conn_release;
2295         err = device_register(&conn->dev);
2296         if (err) {
2297                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2298                                          "register connection's dev\n");
2299                 goto release_parent_ref;
2300         }
2301         err = transport_register_device(&conn->dev);
2302         if (err) {
2303                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2304                                          "register transport's dev\n");
2305                 goto release_conn_ref;
2306         }
2307
2308         spin_lock_irqsave(&connlock, flags);
2309         list_add(&conn->conn_list, &connlist);
2310         spin_unlock_irqrestore(&connlock, flags);
2311
2312         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2313         return conn;
2314
2315 release_conn_ref:
2316         put_device(&conn->dev);
2317 release_parent_ref:
2318         put_device(&session->dev);
2319 free_conn:
2320         kfree(conn);
2321         return NULL;
2322 }
2323
2324 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2325
2326 /**
2327  * iscsi_destroy_conn - destroy iscsi class connection
2328  * @conn: iscsi cls session
2329  *
2330  * This can be called from a LLD or iscsi_transport.
2331  */
2332 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2333 {
2334         unsigned long flags;
2335
2336         spin_lock_irqsave(&connlock, flags);
2337         list_del(&conn->conn_list);
2338         list_del(&conn->conn_list_err);
2339         spin_unlock_irqrestore(&connlock, flags);
2340
2341         transport_unregister_device(&conn->dev);
2342         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2343         device_unregister(&conn->dev);
2344         return 0;
2345 }
2346 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2347
2348 /*
2349  * iscsi interface functions
2350  */
2351 static struct iscsi_internal *
2352 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2353 {
2354         struct iscsi_internal *priv;
2355         unsigned long flags;
2356
2357         spin_lock_irqsave(&iscsi_transport_lock, flags);
2358         list_for_each_entry(priv, &iscsi_transports, list) {
2359                 if (tt == priv->iscsi_transport) {
2360                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2361                         return priv;
2362                 }
2363         }
2364         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2365         return NULL;
2366 }
2367
2368 static int
2369 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2370 {
2371         return nlmsg_multicast(nls, skb, 0, group, gfp);
2372 }
2373
2374 static int
2375 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2376 {
2377         return nlmsg_unicast(nls, skb, portid);
2378 }
2379
2380 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2381                    char *data, uint32_t data_size)
2382 {
2383         struct nlmsghdr *nlh;
2384         struct sk_buff *skb;
2385         struct iscsi_uevent *ev;
2386         char *pdu;
2387         struct iscsi_internal *priv;
2388         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2389                                    data_size);
2390
2391         priv = iscsi_if_transport_lookup(conn->transport);
2392         if (!priv)
2393                 return -EINVAL;
2394
2395         skb = alloc_skb(len, GFP_ATOMIC);
2396         if (!skb) {
2397                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2398                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2399                                       "control PDU: OOM\n");
2400                 return -ENOMEM;
2401         }
2402
2403         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2404         ev = nlmsg_data(nlh);
2405         memset(ev, 0, sizeof(*ev));
2406         ev->transport_handle = iscsi_handle(conn->transport);
2407         ev->type = ISCSI_KEVENT_RECV_PDU;
2408         ev->r.recv_req.cid = conn->cid;
2409         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2410         pdu = (char*)ev + sizeof(*ev);
2411         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2412         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2413
2414         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2415 }
2416 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2417
2418 int iscsi_offload_mesg(struct Scsi_Host *shost,
2419                        struct iscsi_transport *transport, uint32_t type,
2420                        char *data, uint16_t data_size)
2421 {
2422         struct nlmsghdr *nlh;
2423         struct sk_buff *skb;
2424         struct iscsi_uevent *ev;
2425         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2426
2427         skb = alloc_skb(len, GFP_ATOMIC);
2428         if (!skb) {
2429                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2430                 return -ENOMEM;
2431         }
2432
2433         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2434         ev = nlmsg_data(nlh);
2435         memset(ev, 0, sizeof(*ev));
2436         ev->type = type;
2437         ev->transport_handle = iscsi_handle(transport);
2438         switch (type) {
2439         case ISCSI_KEVENT_PATH_REQ:
2440                 ev->r.req_path.host_no = shost->host_no;
2441                 break;
2442         case ISCSI_KEVENT_IF_DOWN:
2443                 ev->r.notify_if_down.host_no = shost->host_no;
2444                 break;
2445         }
2446
2447         memcpy((char *)ev + sizeof(*ev), data, data_size);
2448
2449         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2450 }
2451 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2452
2453 /*
2454  * This can be called without the rx_queue_mutex, if invoked by the kernel
2455  * stop work. But, in that case, it is guaranteed not to race with
2456  * iscsi_destroy by conn_mutex.
2457  */
2458 static void iscsi_if_stop_conn(struct iscsi_cls_conn *conn, int flag)
2459 {
2460         /*
2461          * It is important that this path doesn't rely on
2462          * rx_queue_mutex, otherwise, a thread doing allocation on a
2463          * start_session/start_connection could sleep waiting on a
2464          * writeback to a failed iscsi device, that cannot be recovered
2465          * because the lock is held.  If we don't hold it here, the
2466          * kernel stop_conn_work_fn has a chance to stop the broken
2467          * session and resolve the allocation.
2468          *
2469          * Still, the user invoked .stop_conn() needs to be serialized
2470          * with stop_conn_work_fn by a private mutex.  Not pretty, but
2471          * it works.
2472          */
2473         mutex_lock(&conn_mutex);
2474         conn->transport->stop_conn(conn, flag);
2475         mutex_unlock(&conn_mutex);
2476
2477 }
2478
2479 static void stop_conn_work_fn(struct work_struct *work)
2480 {
2481         struct iscsi_cls_conn *conn, *tmp;
2482         unsigned long flags;
2483         LIST_HEAD(recovery_list);
2484
2485         spin_lock_irqsave(&connlock, flags);
2486         if (list_empty(&connlist_err)) {
2487                 spin_unlock_irqrestore(&connlock, flags);
2488                 return;
2489         }
2490         list_splice_init(&connlist_err, &recovery_list);
2491         spin_unlock_irqrestore(&connlock, flags);
2492
2493         list_for_each_entry_safe(conn, tmp, &recovery_list, conn_list_err) {
2494                 uint32_t sid = iscsi_conn_get_sid(conn);
2495                 struct iscsi_cls_session *session;
2496
2497                 session = iscsi_session_lookup(sid);
2498                 if (session) {
2499                         if (system_state != SYSTEM_RUNNING) {
2500                                 session->recovery_tmo = 0;
2501                                 iscsi_if_stop_conn(conn, STOP_CONN_TERM);
2502                         } else {
2503                                 iscsi_if_stop_conn(conn, STOP_CONN_RECOVER);
2504                         }
2505                 }
2506
2507                 list_del_init(&conn->conn_list_err);
2508         }
2509 }
2510
2511 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2512 {
2513         struct nlmsghdr *nlh;
2514         struct sk_buff  *skb;
2515         struct iscsi_uevent *ev;
2516         struct iscsi_internal *priv;
2517         int len = nlmsg_total_size(sizeof(*ev));
2518         unsigned long flags;
2519
2520         spin_lock_irqsave(&connlock, flags);
2521         list_add(&conn->conn_list_err, &connlist_err);
2522         spin_unlock_irqrestore(&connlock, flags);
2523         queue_work(system_unbound_wq, &stop_conn_work);
2524
2525         priv = iscsi_if_transport_lookup(conn->transport);
2526         if (!priv)
2527                 return;
2528
2529         skb = alloc_skb(len, GFP_ATOMIC);
2530         if (!skb) {
2531                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2532                                       "conn error (%d)\n", error);
2533                 return;
2534         }
2535
2536         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2537         ev = nlmsg_data(nlh);
2538         ev->transport_handle = iscsi_handle(conn->transport);
2539         ev->type = ISCSI_KEVENT_CONN_ERROR;
2540         ev->r.connerror.error = error;
2541         ev->r.connerror.cid = conn->cid;
2542         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2543
2544         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2545
2546         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2547                               error);
2548 }
2549 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2550
2551 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2552                             enum iscsi_conn_state state)
2553 {
2554         struct nlmsghdr *nlh;
2555         struct sk_buff  *skb;
2556         struct iscsi_uevent *ev;
2557         struct iscsi_internal *priv;
2558         int len = nlmsg_total_size(sizeof(*ev));
2559
2560         priv = iscsi_if_transport_lookup(conn->transport);
2561         if (!priv)
2562                 return;
2563
2564         skb = alloc_skb(len, GFP_ATOMIC);
2565         if (!skb) {
2566                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2567                                       "conn login (%d)\n", state);
2568                 return;
2569         }
2570
2571         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2572         ev = nlmsg_data(nlh);
2573         ev->transport_handle = iscsi_handle(conn->transport);
2574         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2575         ev->r.conn_login.state = state;
2576         ev->r.conn_login.cid = conn->cid;
2577         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2578         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2579
2580         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2581                               state);
2582 }
2583 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2584
2585 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2586                            enum iscsi_host_event_code code, uint32_t data_size,
2587                            uint8_t *data)
2588 {
2589         struct nlmsghdr *nlh;
2590         struct sk_buff *skb;
2591         struct iscsi_uevent *ev;
2592         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2593
2594         skb = alloc_skb(len, GFP_NOIO);
2595         if (!skb) {
2596                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2597                        host_no, code);
2598                 return;
2599         }
2600
2601         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2602         ev = nlmsg_data(nlh);
2603         ev->transport_handle = iscsi_handle(transport);
2604         ev->type = ISCSI_KEVENT_HOST_EVENT;
2605         ev->r.host_event.host_no = host_no;
2606         ev->r.host_event.code = code;
2607         ev->r.host_event.data_size = data_size;
2608
2609         if (data_size)
2610                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2611
2612         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2613 }
2614 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2615
2616 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2617                            uint32_t status, uint32_t pid, uint32_t data_size,
2618                            uint8_t *data)
2619 {
2620         struct nlmsghdr *nlh;
2621         struct sk_buff *skb;
2622         struct iscsi_uevent *ev;
2623         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2624
2625         skb = alloc_skb(len, GFP_NOIO);
2626         if (!skb) {
2627                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2628                 return;
2629         }
2630
2631         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2632         ev = nlmsg_data(nlh);
2633         ev->transport_handle = iscsi_handle(transport);
2634         ev->type = ISCSI_KEVENT_PING_COMP;
2635         ev->r.ping_comp.host_no = host_no;
2636         ev->r.ping_comp.status = status;
2637         ev->r.ping_comp.pid = pid;
2638         ev->r.ping_comp.data_size = data_size;
2639         memcpy((char *)ev + sizeof(*ev), data, data_size);
2640
2641         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2642 }
2643 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2644
2645 static int
2646 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2647 {
2648         struct sk_buff  *skb;
2649         struct nlmsghdr *nlh;
2650         int len = nlmsg_total_size(size);
2651
2652         skb = alloc_skb(len, GFP_ATOMIC);
2653         if (!skb) {
2654                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2655                 return -ENOMEM;
2656         }
2657
2658         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2659         memcpy(nlmsg_data(nlh), payload, size);
2660         return iscsi_unicast_skb(skb, portid);
2661 }
2662
2663 static int
2664 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2665 {
2666         struct iscsi_uevent *ev = nlmsg_data(nlh);
2667         struct iscsi_stats *stats;
2668         struct sk_buff *skbstat;
2669         struct iscsi_cls_conn *conn;
2670         struct nlmsghdr *nlhstat;
2671         struct iscsi_uevent *evstat;
2672         struct iscsi_internal *priv;
2673         int len = nlmsg_total_size(sizeof(*ev) +
2674                                    sizeof(struct iscsi_stats) +
2675                                    sizeof(struct iscsi_stats_custom) *
2676                                    ISCSI_STATS_CUSTOM_MAX);
2677         int err = 0;
2678
2679         priv = iscsi_if_transport_lookup(transport);
2680         if (!priv)
2681                 return -EINVAL;
2682
2683         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2684         if (!conn)
2685                 return -EEXIST;
2686
2687         do {
2688                 int actual_size;
2689
2690                 skbstat = alloc_skb(len, GFP_ATOMIC);
2691                 if (!skbstat) {
2692                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2693                                               "deliver stats: OOM\n");
2694                         return -ENOMEM;
2695                 }
2696
2697                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2698                                       (len - sizeof(*nlhstat)), 0);
2699                 evstat = nlmsg_data(nlhstat);
2700                 memset(evstat, 0, sizeof(*evstat));
2701                 evstat->transport_handle = iscsi_handle(conn->transport);
2702                 evstat->type = nlh->nlmsg_type;
2703                 evstat->u.get_stats.cid =
2704                         ev->u.get_stats.cid;
2705                 evstat->u.get_stats.sid =
2706                         ev->u.get_stats.sid;
2707                 stats = (struct iscsi_stats *)
2708                         ((char*)evstat + sizeof(*evstat));
2709                 memset(stats, 0, sizeof(*stats));
2710
2711                 transport->get_stats(conn, stats);
2712                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2713                                                sizeof(struct iscsi_stats) +
2714                                                sizeof(struct iscsi_stats_custom) *
2715                                                stats->custom_length);
2716                 actual_size -= sizeof(*nlhstat);
2717                 actual_size = nlmsg_msg_size(actual_size);
2718                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2719                 nlhstat->nlmsg_len = actual_size;
2720
2721                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2722                                           GFP_ATOMIC);
2723         } while (err < 0 && err != -ECONNREFUSED);
2724
2725         return err;
2726 }
2727
2728 /**
2729  * iscsi_session_event - send session destr. completion event
2730  * @session: iscsi class session
2731  * @event: type of event
2732  */
2733 int iscsi_session_event(struct iscsi_cls_session *session,
2734                         enum iscsi_uevent_e event)
2735 {
2736         struct iscsi_internal *priv;
2737         struct Scsi_Host *shost;
2738         struct iscsi_uevent *ev;
2739         struct sk_buff  *skb;
2740         struct nlmsghdr *nlh;
2741         int rc, len = nlmsg_total_size(sizeof(*ev));
2742
2743         priv = iscsi_if_transport_lookup(session->transport);
2744         if (!priv)
2745                 return -EINVAL;
2746         shost = iscsi_session_to_shost(session);
2747
2748         skb = alloc_skb(len, GFP_KERNEL);
2749         if (!skb) {
2750                 iscsi_cls_session_printk(KERN_ERR, session,
2751                                          "Cannot notify userspace of session "
2752                                          "event %u\n", event);
2753                 return -ENOMEM;
2754         }
2755
2756         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2757         ev = nlmsg_data(nlh);
2758         ev->transport_handle = iscsi_handle(session->transport);
2759
2760         ev->type = event;
2761         switch (event) {
2762         case ISCSI_KEVENT_DESTROY_SESSION:
2763                 ev->r.d_session.host_no = shost->host_no;
2764                 ev->r.d_session.sid = session->sid;
2765                 break;
2766         case ISCSI_KEVENT_CREATE_SESSION:
2767                 ev->r.c_session_ret.host_no = shost->host_no;
2768                 ev->r.c_session_ret.sid = session->sid;
2769                 break;
2770         case ISCSI_KEVENT_UNBIND_SESSION:
2771                 ev->r.unbind_session.host_no = shost->host_no;
2772                 ev->r.unbind_session.sid = session->sid;
2773                 break;
2774         default:
2775                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2776                                          "%u.\n", event);
2777                 kfree_skb(skb);
2778                 return -EINVAL;
2779         }
2780
2781         /*
2782          * this will occur if the daemon is not up, so we just warn
2783          * the user and when the daemon is restarted it will handle it
2784          */
2785         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2786         if (rc == -ESRCH)
2787                 iscsi_cls_session_printk(KERN_ERR, session,
2788                                          "Cannot notify userspace of session "
2789                                          "event %u. Check iscsi daemon\n",
2790                                          event);
2791
2792         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2793                                 event, rc);
2794         return rc;
2795 }
2796 EXPORT_SYMBOL_GPL(iscsi_session_event);
2797
2798 static int
2799 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2800                         struct iscsi_uevent *ev, pid_t pid,
2801                         uint32_t initial_cmdsn, uint16_t cmds_max,
2802                         uint16_t queue_depth)
2803 {
2804         struct iscsi_transport *transport = priv->iscsi_transport;
2805         struct iscsi_cls_session *session;
2806         struct Scsi_Host *shost;
2807
2808         session = transport->create_session(ep, cmds_max, queue_depth,
2809                                             initial_cmdsn);
2810         if (!session)
2811                 return -ENOMEM;
2812
2813         session->creator = pid;
2814         shost = iscsi_session_to_shost(session);
2815         ev->r.c_session_ret.host_no = shost->host_no;
2816         ev->r.c_session_ret.sid = session->sid;
2817         ISCSI_DBG_TRANS_SESSION(session,
2818                                 "Completed creating transport session\n");
2819         return 0;
2820 }
2821
2822 static int
2823 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2824 {
2825         struct iscsi_cls_conn *conn;
2826         struct iscsi_cls_session *session;
2827
2828         session = iscsi_session_lookup(ev->u.c_conn.sid);
2829         if (!session) {
2830                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2831                        ev->u.c_conn.sid);
2832                 return -EINVAL;
2833         }
2834
2835         conn = transport->create_conn(session, ev->u.c_conn.cid);
2836         if (!conn) {
2837                 iscsi_cls_session_printk(KERN_ERR, session,
2838                                          "couldn't create a new connection.");
2839                 return -ENOMEM;
2840         }
2841
2842         ev->r.c_conn_ret.sid = session->sid;
2843         ev->r.c_conn_ret.cid = conn->cid;
2844
2845         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2846         return 0;
2847 }
2848
2849 static int
2850 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2851 {
2852         struct iscsi_cls_conn *conn;
2853         unsigned long flags;
2854
2855         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2856         if (!conn)
2857                 return -EINVAL;
2858
2859         spin_lock_irqsave(&connlock, flags);
2860         if (!list_empty(&conn->conn_list_err)) {
2861                 spin_unlock_irqrestore(&connlock, flags);
2862                 return -EAGAIN;
2863         }
2864         spin_unlock_irqrestore(&connlock, flags);
2865
2866         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2867
2868         mutex_lock(&conn_mutex);
2869         if (transport->destroy_conn)
2870                 transport->destroy_conn(conn);
2871         mutex_unlock(&conn_mutex);
2872
2873         return 0;
2874 }
2875
2876 static int
2877 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2878 {
2879         char *data = (char*)ev + sizeof(*ev);
2880         struct iscsi_cls_conn *conn;
2881         struct iscsi_cls_session *session;
2882         int err = 0, value = 0;
2883
2884         session = iscsi_session_lookup(ev->u.set_param.sid);
2885         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2886         if (!conn || !session)
2887                 return -EINVAL;
2888
2889         switch (ev->u.set_param.param) {
2890         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2891                 sscanf(data, "%d", &value);
2892                 if (!session->recovery_tmo_sysfs_override)
2893                         session->recovery_tmo = value;
2894                 break;
2895         default:
2896                 err = transport->set_param(conn, ev->u.set_param.param,
2897                                            data, ev->u.set_param.len);
2898         }
2899
2900         return err;
2901 }
2902
2903 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2904                                struct iscsi_uevent *ev, int msg_type)
2905 {
2906         struct iscsi_endpoint *ep;
2907         struct sockaddr *dst_addr;
2908         struct Scsi_Host *shost = NULL;
2909         int non_blocking, err = 0;
2910
2911         if (!transport->ep_connect)
2912                 return -EINVAL;
2913
2914         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2915                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2916                 if (!shost) {
2917                         printk(KERN_ERR "ep connect failed. Could not find "
2918                                "host no %u\n",
2919                                ev->u.ep_connect_through_host.host_no);
2920                         return -ENODEV;
2921                 }
2922                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2923         } else
2924                 non_blocking = ev->u.ep_connect.non_blocking;
2925
2926         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2927         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2928         if (IS_ERR(ep)) {
2929                 err = PTR_ERR(ep);
2930                 goto release_host;
2931         }
2932
2933         ev->r.ep_connect_ret.handle = ep->id;
2934 release_host:
2935         if (shost)
2936                 scsi_host_put(shost);
2937         return err;
2938 }
2939
2940 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2941                                   u64 ep_handle)
2942 {
2943         struct iscsi_cls_conn *conn;
2944         struct iscsi_endpoint *ep;
2945
2946         if (!transport->ep_disconnect)
2947                 return -EINVAL;
2948
2949         ep = iscsi_lookup_endpoint(ep_handle);
2950         if (!ep)
2951                 return -EINVAL;
2952         conn = ep->conn;
2953         if (conn) {
2954                 mutex_lock(&conn->ep_mutex);
2955                 conn->ep = NULL;
2956                 mutex_unlock(&conn->ep_mutex);
2957         }
2958
2959         transport->ep_disconnect(ep);
2960         return 0;
2961 }
2962
2963 static int
2964 iscsi_if_transport_ep(struct iscsi_transport *transport,
2965                       struct iscsi_uevent *ev, int msg_type)
2966 {
2967         struct iscsi_endpoint *ep;
2968         int rc = 0;
2969
2970         switch (msg_type) {
2971         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2972         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2973                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
2974                 break;
2975         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2976                 if (!transport->ep_poll)
2977                         return -EINVAL;
2978
2979                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2980                 if (!ep)
2981                         return -EINVAL;
2982
2983                 ev->r.retcode = transport->ep_poll(ep,
2984                                                    ev->u.ep_poll.timeout_ms);
2985                 break;
2986         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2987                 rc = iscsi_if_ep_disconnect(transport,
2988                                             ev->u.ep_disconnect.ep_handle);
2989                 break;
2990         }
2991         return rc;
2992 }
2993
2994 static int
2995 iscsi_tgt_dscvr(struct iscsi_transport *transport,
2996                 struct iscsi_uevent *ev)
2997 {
2998         struct Scsi_Host *shost;
2999         struct sockaddr *dst_addr;
3000         int err;
3001
3002         if (!transport->tgt_dscvr)
3003                 return -EINVAL;
3004
3005         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3006         if (!shost) {
3007                 printk(KERN_ERR "target discovery could not find host no %u\n",
3008                        ev->u.tgt_dscvr.host_no);
3009                 return -ENODEV;
3010         }
3011
3012
3013         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3014         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3015                                    ev->u.tgt_dscvr.enable, dst_addr);
3016         scsi_host_put(shost);
3017         return err;
3018 }
3019
3020 static int
3021 iscsi_set_host_param(struct iscsi_transport *transport,
3022                      struct iscsi_uevent *ev)
3023 {
3024         char *data = (char*)ev + sizeof(*ev);
3025         struct Scsi_Host *shost;
3026         int err;
3027
3028         if (!transport->set_host_param)
3029                 return -ENOSYS;
3030
3031         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3032         if (!shost) {
3033                 printk(KERN_ERR "set_host_param could not find host no %u\n",
3034                        ev->u.set_host_param.host_no);
3035                 return -ENODEV;
3036         }
3037
3038         err = transport->set_host_param(shost, ev->u.set_host_param.param,
3039                                         data, ev->u.set_host_param.len);
3040         scsi_host_put(shost);
3041         return err;
3042 }
3043
3044 static int
3045 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3046 {
3047         struct Scsi_Host *shost;
3048         struct iscsi_path *params;
3049         int err;
3050
3051         if (!transport->set_path)
3052                 return -ENOSYS;
3053
3054         shost = scsi_host_lookup(ev->u.set_path.host_no);
3055         if (!shost) {
3056                 printk(KERN_ERR "set path could not find host no %u\n",
3057                        ev->u.set_path.host_no);
3058                 return -ENODEV;
3059         }
3060
3061         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3062         err = transport->set_path(shost, params);
3063
3064         scsi_host_put(shost);
3065         return err;
3066 }
3067
3068 static int iscsi_session_has_conns(int sid)
3069 {
3070         struct iscsi_cls_conn *conn;
3071         unsigned long flags;
3072         int found = 0;
3073
3074         spin_lock_irqsave(&connlock, flags);
3075         list_for_each_entry(conn, &connlist, conn_list) {
3076                 if (iscsi_conn_get_sid(conn) == sid) {
3077                         found = 1;
3078                         break;
3079                 }
3080         }
3081         spin_unlock_irqrestore(&connlock, flags);
3082
3083         return found;
3084 }
3085
3086 static int
3087 iscsi_set_iface_params(struct iscsi_transport *transport,
3088                        struct iscsi_uevent *ev, uint32_t len)
3089 {
3090         char *data = (char *)ev + sizeof(*ev);
3091         struct Scsi_Host *shost;
3092         int err;
3093
3094         if (!transport->set_iface_param)
3095                 return -ENOSYS;
3096
3097         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3098         if (!shost) {
3099                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
3100                        ev->u.set_iface_params.host_no);
3101                 return -ENODEV;
3102         }
3103
3104         err = transport->set_iface_param(shost, data, len);
3105         scsi_host_put(shost);
3106         return err;
3107 }
3108
3109 static int
3110 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3111 {
3112         struct Scsi_Host *shost;
3113         struct sockaddr *dst_addr;
3114         int err;
3115
3116         if (!transport->send_ping)
3117                 return -ENOSYS;
3118
3119         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3120         if (!shost) {
3121                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3122                        ev->u.iscsi_ping.host_no);
3123                 return -ENODEV;
3124         }
3125
3126         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3127         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3128                                    ev->u.iscsi_ping.iface_type,
3129                                    ev->u.iscsi_ping.payload_size,
3130                                    ev->u.iscsi_ping.pid,
3131                                    dst_addr);
3132         scsi_host_put(shost);
3133         return err;
3134 }
3135
3136 static int
3137 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3138 {
3139         struct iscsi_uevent *ev = nlmsg_data(nlh);
3140         struct Scsi_Host *shost = NULL;
3141         struct iscsi_chap_rec *chap_rec;
3142         struct iscsi_internal *priv;
3143         struct sk_buff *skbchap;
3144         struct nlmsghdr *nlhchap;
3145         struct iscsi_uevent *evchap;
3146         uint32_t chap_buf_size;
3147         int len, err = 0;
3148         char *buf;
3149
3150         if (!transport->get_chap)
3151                 return -EINVAL;
3152
3153         priv = iscsi_if_transport_lookup(transport);
3154         if (!priv)
3155                 return -EINVAL;
3156
3157         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3158         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3159
3160         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3161         if (!shost) {
3162                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3163                        __func__, ev->u.get_chap.host_no);
3164                 return -ENODEV;
3165         }
3166
3167         do {
3168                 int actual_size;
3169
3170                 skbchap = alloc_skb(len, GFP_KERNEL);
3171                 if (!skbchap) {
3172                         printk(KERN_ERR "can not deliver chap: OOM\n");
3173                         err = -ENOMEM;
3174                         goto exit_get_chap;
3175                 }
3176
3177                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3178                                       (len - sizeof(*nlhchap)), 0);
3179                 evchap = nlmsg_data(nlhchap);
3180                 memset(evchap, 0, sizeof(*evchap));
3181                 evchap->transport_handle = iscsi_handle(transport);
3182                 evchap->type = nlh->nlmsg_type;
3183                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3184                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3185                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3186                 buf = (char *)evchap + sizeof(*evchap);
3187                 memset(buf, 0, chap_buf_size);
3188
3189                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3190                                     &evchap->u.get_chap.num_entries, buf);
3191
3192                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3193                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3194                 nlhchap->nlmsg_len = actual_size;
3195
3196                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3197                                           GFP_KERNEL);
3198         } while (err < 0 && err != -ECONNREFUSED);
3199
3200 exit_get_chap:
3201         scsi_host_put(shost);
3202         return err;
3203 }
3204
3205 static int iscsi_set_chap(struct iscsi_transport *transport,
3206                           struct iscsi_uevent *ev, uint32_t len)
3207 {
3208         char *data = (char *)ev + sizeof(*ev);
3209         struct Scsi_Host *shost;
3210         int err = 0;
3211
3212         if (!transport->set_chap)
3213                 return -ENOSYS;
3214
3215         shost = scsi_host_lookup(ev->u.set_path.host_no);
3216         if (!shost) {
3217                 pr_err("%s could not find host no %u\n",
3218                        __func__, ev->u.set_path.host_no);
3219                 return -ENODEV;
3220         }
3221
3222         err = transport->set_chap(shost, data, len);
3223         scsi_host_put(shost);
3224         return err;
3225 }
3226
3227 static int iscsi_delete_chap(struct iscsi_transport *transport,
3228                              struct iscsi_uevent *ev)
3229 {
3230         struct Scsi_Host *shost;
3231         int err = 0;
3232
3233         if (!transport->delete_chap)
3234                 return -ENOSYS;
3235
3236         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3237         if (!shost) {
3238                 printk(KERN_ERR "%s could not find host no %u\n",
3239                        __func__, ev->u.delete_chap.host_no);
3240                 return -ENODEV;
3241         }
3242
3243         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3244         scsi_host_put(shost);
3245         return err;
3246 }
3247
3248 static const struct {
3249         enum iscsi_discovery_parent_type value;
3250         char                            *name;
3251 } iscsi_discovery_parent_names[] = {
3252         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3253         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3254         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3255 };
3256
3257 char *iscsi_get_discovery_parent_name(int parent_type)
3258 {
3259         int i;
3260         char *state = "Unknown!";
3261
3262         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3263                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3264                         state = iscsi_discovery_parent_names[i].name;
3265                         break;
3266                 }
3267         }
3268         return state;
3269 }
3270 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3271
3272 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3273                                      struct iscsi_uevent *ev, uint32_t len)
3274 {
3275         char *data = (char *)ev + sizeof(*ev);
3276         struct Scsi_Host *shost;
3277         struct iscsi_bus_flash_session *fnode_sess;
3278         struct iscsi_bus_flash_conn *fnode_conn;
3279         struct device *dev;
3280         uint32_t idx;
3281         int err = 0;
3282
3283         if (!transport->set_flashnode_param) {
3284                 err = -ENOSYS;
3285                 goto exit_set_fnode;
3286         }
3287
3288         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3289         if (!shost) {
3290                 pr_err("%s could not find host no %u\n",
3291                        __func__, ev->u.set_flashnode.host_no);
3292                 err = -ENODEV;
3293                 goto exit_set_fnode;
3294         }
3295
3296         idx = ev->u.set_flashnode.flashnode_idx;
3297         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3298         if (!fnode_sess) {
3299                 pr_err("%s could not find flashnode %u for host no %u\n",
3300                        __func__, idx, ev->u.set_flashnode.host_no);
3301                 err = -ENODEV;
3302                 goto put_host;
3303         }
3304
3305         dev = iscsi_find_flashnode_conn(fnode_sess);
3306         if (!dev) {
3307                 err = -ENODEV;
3308                 goto put_sess;
3309         }
3310
3311         fnode_conn = iscsi_dev_to_flash_conn(dev);
3312         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3313         put_device(dev);
3314
3315 put_sess:
3316         put_device(&fnode_sess->dev);
3317
3318 put_host:
3319         scsi_host_put(shost);
3320
3321 exit_set_fnode:
3322         return err;
3323 }
3324
3325 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3326                                struct iscsi_uevent *ev, uint32_t len)
3327 {
3328         char *data = (char *)ev + sizeof(*ev);
3329         struct Scsi_Host *shost;
3330         int index;
3331         int err = 0;
3332
3333         if (!transport->new_flashnode) {
3334                 err = -ENOSYS;
3335                 goto exit_new_fnode;
3336         }
3337
3338         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3339         if (!shost) {
3340                 pr_err("%s could not find host no %u\n",
3341                        __func__, ev->u.new_flashnode.host_no);
3342                 err = -ENODEV;
3343                 goto put_host;
3344         }
3345
3346         index = transport->new_flashnode(shost, data, len);
3347
3348         if (index >= 0)
3349                 ev->r.new_flashnode_ret.flashnode_idx = index;
3350         else
3351                 err = -EIO;
3352
3353 put_host:
3354         scsi_host_put(shost);
3355
3356 exit_new_fnode:
3357         return err;
3358 }
3359
3360 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3361                                struct iscsi_uevent *ev)
3362 {
3363         struct Scsi_Host *shost;
3364         struct iscsi_bus_flash_session *fnode_sess;
3365         uint32_t idx;
3366         int err = 0;
3367
3368         if (!transport->del_flashnode) {
3369                 err = -ENOSYS;
3370                 goto exit_del_fnode;
3371         }
3372
3373         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3374         if (!shost) {
3375                 pr_err("%s could not find host no %u\n",
3376                        __func__, ev->u.del_flashnode.host_no);
3377                 err = -ENODEV;
3378                 goto put_host;
3379         }
3380
3381         idx = ev->u.del_flashnode.flashnode_idx;
3382         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3383         if (!fnode_sess) {
3384                 pr_err("%s could not find flashnode %u for host no %u\n",
3385                        __func__, idx, ev->u.del_flashnode.host_no);
3386                 err = -ENODEV;
3387                 goto put_host;
3388         }
3389
3390         err = transport->del_flashnode(fnode_sess);
3391         put_device(&fnode_sess->dev);
3392
3393 put_host:
3394         scsi_host_put(shost);
3395
3396 exit_del_fnode:
3397         return err;
3398 }
3399
3400 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3401                                  struct iscsi_uevent *ev)
3402 {
3403         struct Scsi_Host *shost;
3404         struct iscsi_bus_flash_session *fnode_sess;
3405         struct iscsi_bus_flash_conn *fnode_conn;
3406         struct device *dev;
3407         uint32_t idx;
3408         int err = 0;
3409
3410         if (!transport->login_flashnode) {
3411                 err = -ENOSYS;
3412                 goto exit_login_fnode;
3413         }
3414
3415         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3416         if (!shost) {
3417                 pr_err("%s could not find host no %u\n",
3418                        __func__, ev->u.login_flashnode.host_no);
3419                 err = -ENODEV;
3420                 goto put_host;
3421         }
3422
3423         idx = ev->u.login_flashnode.flashnode_idx;
3424         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3425         if (!fnode_sess) {
3426                 pr_err("%s could not find flashnode %u for host no %u\n",
3427                        __func__, idx, ev->u.login_flashnode.host_no);
3428                 err = -ENODEV;
3429                 goto put_host;
3430         }
3431
3432         dev = iscsi_find_flashnode_conn(fnode_sess);
3433         if (!dev) {
3434                 err = -ENODEV;
3435                 goto put_sess;
3436         }
3437
3438         fnode_conn = iscsi_dev_to_flash_conn(dev);
3439         err = transport->login_flashnode(fnode_sess, fnode_conn);
3440         put_device(dev);
3441
3442 put_sess:
3443         put_device(&fnode_sess->dev);
3444
3445 put_host:
3446         scsi_host_put(shost);
3447
3448 exit_login_fnode:
3449         return err;
3450 }
3451
3452 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3453                                   struct iscsi_uevent *ev)
3454 {
3455         struct Scsi_Host *shost;
3456         struct iscsi_bus_flash_session *fnode_sess;
3457         struct iscsi_bus_flash_conn *fnode_conn;
3458         struct device *dev;
3459         uint32_t idx;
3460         int err = 0;
3461
3462         if (!transport->logout_flashnode) {
3463                 err = -ENOSYS;
3464                 goto exit_logout_fnode;
3465         }
3466
3467         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3468         if (!shost) {
3469                 pr_err("%s could not find host no %u\n",
3470                        __func__, ev->u.logout_flashnode.host_no);
3471                 err = -ENODEV;
3472                 goto put_host;
3473         }
3474
3475         idx = ev->u.logout_flashnode.flashnode_idx;
3476         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3477         if (!fnode_sess) {
3478                 pr_err("%s could not find flashnode %u for host no %u\n",
3479                        __func__, idx, ev->u.logout_flashnode.host_no);
3480                 err = -ENODEV;
3481                 goto put_host;
3482         }
3483
3484         dev = iscsi_find_flashnode_conn(fnode_sess);
3485         if (!dev) {
3486                 err = -ENODEV;
3487                 goto put_sess;
3488         }
3489
3490         fnode_conn = iscsi_dev_to_flash_conn(dev);
3491
3492         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3493         put_device(dev);
3494
3495 put_sess:
3496         put_device(&fnode_sess->dev);
3497
3498 put_host:
3499         scsi_host_put(shost);
3500
3501 exit_logout_fnode:
3502         return err;
3503 }
3504
3505 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3506                                       struct iscsi_uevent *ev)
3507 {
3508         struct Scsi_Host *shost;
3509         struct iscsi_cls_session *session;
3510         int err = 0;
3511
3512         if (!transport->logout_flashnode_sid) {
3513                 err = -ENOSYS;
3514                 goto exit_logout_sid;
3515         }
3516
3517         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3518         if (!shost) {
3519                 pr_err("%s could not find host no %u\n",
3520                        __func__, ev->u.logout_flashnode.host_no);
3521                 err = -ENODEV;
3522                 goto put_host;
3523         }
3524
3525         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3526         if (!session) {
3527                 pr_err("%s could not find session id %u\n",
3528                        __func__, ev->u.logout_flashnode_sid.sid);
3529                 err = -EINVAL;
3530                 goto put_host;
3531         }
3532
3533         err = transport->logout_flashnode_sid(session);
3534
3535 put_host:
3536         scsi_host_put(shost);
3537
3538 exit_logout_sid:
3539         return err;
3540 }
3541
3542 static int
3543 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3544 {
3545         struct iscsi_uevent *ev = nlmsg_data(nlh);
3546         struct Scsi_Host *shost = NULL;
3547         struct iscsi_internal *priv;
3548         struct sk_buff *skbhost_stats;
3549         struct nlmsghdr *nlhhost_stats;
3550         struct iscsi_uevent *evhost_stats;
3551         int host_stats_size = 0;
3552         int len, err = 0;
3553         char *buf;
3554
3555         if (!transport->get_host_stats)
3556                 return -ENOSYS;
3557
3558         priv = iscsi_if_transport_lookup(transport);
3559         if (!priv)
3560                 return -EINVAL;
3561
3562         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3563         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3564
3565         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3566         if (!shost) {
3567                 pr_err("%s: failed. Could not find host no %u\n",
3568                        __func__, ev->u.get_host_stats.host_no);
3569                 return -ENODEV;
3570         }
3571
3572         do {
3573                 int actual_size;
3574
3575                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3576                 if (!skbhost_stats) {
3577                         pr_err("cannot deliver host stats: OOM\n");
3578                         err = -ENOMEM;
3579                         goto exit_host_stats;
3580                 }
3581
3582                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3583                                       (len - sizeof(*nlhhost_stats)), 0);
3584                 evhost_stats = nlmsg_data(nlhhost_stats);
3585                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3586                 evhost_stats->transport_handle = iscsi_handle(transport);
3587                 evhost_stats->type = nlh->nlmsg_type;
3588                 evhost_stats->u.get_host_stats.host_no =
3589                                         ev->u.get_host_stats.host_no;
3590                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3591                 memset(buf, 0, host_stats_size);
3592
3593                 err = transport->get_host_stats(shost, buf, host_stats_size);
3594                 if (err) {
3595                         kfree_skb(skbhost_stats);
3596                         goto exit_host_stats;
3597                 }
3598
3599                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3600                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3601                 nlhhost_stats->nlmsg_len = actual_size;
3602
3603                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3604                                           GFP_KERNEL);
3605         } while (err < 0 && err != -ECONNREFUSED);
3606
3607 exit_host_stats:
3608         scsi_host_put(shost);
3609         return err;
3610 }
3611
3612
3613 static int
3614 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3615 {
3616         int err = 0;
3617         u32 portid;
3618         struct iscsi_uevent *ev = nlmsg_data(nlh);
3619         struct iscsi_transport *transport = NULL;
3620         struct iscsi_internal *priv;
3621         struct iscsi_cls_session *session;
3622         struct iscsi_cls_conn *conn;
3623         struct iscsi_endpoint *ep = NULL;
3624
3625         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3626                 *group = ISCSI_NL_GRP_UIP;
3627         else
3628                 *group = ISCSI_NL_GRP_ISCSID;
3629
3630         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3631         if (!priv)
3632                 return -EINVAL;
3633         transport = priv->iscsi_transport;
3634
3635         if (!try_module_get(transport->owner))
3636                 return -EINVAL;
3637
3638         portid = NETLINK_CB(skb).portid;
3639
3640         switch (nlh->nlmsg_type) {
3641         case ISCSI_UEVENT_CREATE_SESSION:
3642                 err = iscsi_if_create_session(priv, ep, ev,
3643                                               portid,
3644                                               ev->u.c_session.initial_cmdsn,
3645                                               ev->u.c_session.cmds_max,
3646                                               ev->u.c_session.queue_depth);
3647                 break;
3648         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3649                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3650                 if (!ep) {
3651                         err = -EINVAL;
3652                         break;
3653                 }
3654
3655                 err = iscsi_if_create_session(priv, ep, ev,
3656                                         portid,
3657                                         ev->u.c_bound_session.initial_cmdsn,
3658                                         ev->u.c_bound_session.cmds_max,
3659                                         ev->u.c_bound_session.queue_depth);
3660                 break;
3661         case ISCSI_UEVENT_DESTROY_SESSION:
3662                 session = iscsi_session_lookup(ev->u.d_session.sid);
3663                 if (!session)
3664                         err = -EINVAL;
3665                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3666                         err = -EBUSY;
3667                 else
3668                         transport->destroy_session(session);
3669                 break;
3670         case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3671                 session = iscsi_session_lookup(ev->u.d_session.sid);
3672                 if (!session)
3673                         err = -EINVAL;
3674                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3675                         err = -EBUSY;
3676                 else {
3677                         unsigned long flags;
3678
3679                         /* Prevent this session from being found again */
3680                         spin_lock_irqsave(&sesslock, flags);
3681                         list_del_init(&session->sess_list);
3682                         spin_unlock_irqrestore(&sesslock, flags);
3683
3684                         queue_work(iscsi_destroy_workq, &session->destroy_work);
3685                 }
3686                 break;
3687         case ISCSI_UEVENT_UNBIND_SESSION:
3688                 session = iscsi_session_lookup(ev->u.d_session.sid);
3689                 if (session)
3690                         scsi_queue_work(iscsi_session_to_shost(session),
3691                                         &session->unbind_work);
3692                 else
3693                         err = -EINVAL;
3694                 break;
3695         case ISCSI_UEVENT_CREATE_CONN:
3696                 err = iscsi_if_create_conn(transport, ev);
3697                 break;
3698         case ISCSI_UEVENT_DESTROY_CONN:
3699                 err = iscsi_if_destroy_conn(transport, ev);
3700                 break;
3701         case ISCSI_UEVENT_BIND_CONN:
3702                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3703                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3704
3705                 if (conn && conn->ep)
3706                         iscsi_if_ep_disconnect(transport, conn->ep->id);
3707
3708                 if (!session || !conn) {
3709                         err = -EINVAL;
3710                         break;
3711                 }
3712
3713                 mutex_lock(&conn_mutex);
3714                 ev->r.retcode = transport->bind_conn(session, conn,
3715                                                 ev->u.b_conn.transport_eph,
3716                                                 ev->u.b_conn.is_leading);
3717                 mutex_unlock(&conn_mutex);
3718
3719                 if (ev->r.retcode || !transport->ep_connect)
3720                         break;
3721
3722                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3723                 if (ep) {
3724                         ep->conn = conn;
3725
3726                         mutex_lock(&conn->ep_mutex);
3727                         conn->ep = ep;
3728                         mutex_unlock(&conn->ep_mutex);
3729                 } else
3730                         iscsi_cls_conn_printk(KERN_ERR, conn,
3731                                               "Could not set ep conn "
3732                                               "binding\n");
3733                 break;
3734         case ISCSI_UEVENT_SET_PARAM:
3735                 err = iscsi_set_param(transport, ev);
3736                 break;
3737         case ISCSI_UEVENT_START_CONN:
3738                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3739                 if (conn) {
3740                         mutex_lock(&conn_mutex);
3741                         ev->r.retcode = transport->start_conn(conn);
3742                         if (!ev->r.retcode)
3743                                 conn->state = ISCSI_CONN_UP;
3744                         mutex_unlock(&conn_mutex);
3745                 }
3746                 else
3747                         err = -EINVAL;
3748                 break;
3749         case ISCSI_UEVENT_STOP_CONN:
3750                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3751                 if (conn)
3752                         iscsi_if_stop_conn(conn, ev->u.stop_conn.flag);
3753                 else
3754                         err = -EINVAL;
3755                 break;
3756         case ISCSI_UEVENT_SEND_PDU:
3757                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3758                 if (conn) {
3759                         mutex_lock(&conn_mutex);
3760                         ev->r.retcode = transport->send_pdu(conn,
3761                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3762                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3763                                 ev->u.send_pdu.data_size);
3764                         mutex_unlock(&conn_mutex);
3765                 }
3766                 else
3767                         err = -EINVAL;
3768                 break;
3769         case ISCSI_UEVENT_GET_STATS:
3770                 err = iscsi_if_get_stats(transport, nlh);
3771                 break;
3772         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3773         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3774         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3775         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3776                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3777                 break;
3778         case ISCSI_UEVENT_TGT_DSCVR:
3779                 err = iscsi_tgt_dscvr(transport, ev);
3780                 break;
3781         case ISCSI_UEVENT_SET_HOST_PARAM:
3782                 err = iscsi_set_host_param(transport, ev);
3783                 break;
3784         case ISCSI_UEVENT_PATH_UPDATE:
3785                 err = iscsi_set_path(transport, ev);
3786                 break;
3787         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3788                 err = iscsi_set_iface_params(transport, ev,
3789                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3790                 break;
3791         case ISCSI_UEVENT_PING:
3792                 err = iscsi_send_ping(transport, ev);
3793                 break;
3794         case ISCSI_UEVENT_GET_CHAP:
3795                 err = iscsi_get_chap(transport, nlh);
3796                 break;
3797         case ISCSI_UEVENT_DELETE_CHAP:
3798                 err = iscsi_delete_chap(transport, ev);
3799                 break;
3800         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3801                 err = iscsi_set_flashnode_param(transport, ev,
3802                                                 nlmsg_attrlen(nlh,
3803                                                               sizeof(*ev)));
3804                 break;
3805         case ISCSI_UEVENT_NEW_FLASHNODE:
3806                 err = iscsi_new_flashnode(transport, ev,
3807                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3808                 break;
3809         case ISCSI_UEVENT_DEL_FLASHNODE:
3810                 err = iscsi_del_flashnode(transport, ev);
3811                 break;
3812         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3813                 err = iscsi_login_flashnode(transport, ev);
3814                 break;
3815         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3816                 err = iscsi_logout_flashnode(transport, ev);
3817                 break;
3818         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3819                 err = iscsi_logout_flashnode_sid(transport, ev);
3820                 break;
3821         case ISCSI_UEVENT_SET_CHAP:
3822                 err = iscsi_set_chap(transport, ev,
3823                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3824                 break;
3825         case ISCSI_UEVENT_GET_HOST_STATS:
3826                 err = iscsi_get_host_stats(transport, nlh);
3827                 break;
3828         default:
3829                 err = -ENOSYS;
3830                 break;
3831         }
3832
3833         module_put(transport->owner);
3834         return err;
3835 }
3836
3837 /*
3838  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3839  * Malformed skbs with wrong lengths or invalid creds are not processed.
3840  */
3841 static void
3842 iscsi_if_rx(struct sk_buff *skb)
3843 {
3844         u32 portid = NETLINK_CB(skb).portid;
3845
3846         mutex_lock(&rx_queue_mutex);
3847         while (skb->len >= NLMSG_HDRLEN) {
3848                 int err;
3849                 uint32_t rlen;
3850                 struct nlmsghdr *nlh;
3851                 struct iscsi_uevent *ev;
3852                 uint32_t group;
3853                 int retries = ISCSI_SEND_MAX_ALLOWED;
3854
3855                 nlh = nlmsg_hdr(skb);
3856                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3857                     skb->len < nlh->nlmsg_len) {
3858                         break;
3859                 }
3860
3861                 ev = nlmsg_data(nlh);
3862                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3863                 if (rlen > skb->len)
3864                         rlen = skb->len;
3865
3866                 err = iscsi_if_recv_msg(skb, nlh, &group);
3867                 if (err) {
3868                         ev->type = ISCSI_KEVENT_IF_ERROR;
3869                         ev->iferror = err;
3870                 }
3871                 do {
3872                         /*
3873                          * special case for GET_STATS:
3874                          * on success - sending reply and stats from
3875                          * inside of if_recv_msg(),
3876                          * on error - fall through.
3877                          */
3878                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3879                                 break;
3880                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3881                                 break;
3882                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
3883                                                   ev, sizeof(*ev));
3884                         if (err == -EAGAIN && --retries < 0) {
3885                                 printk(KERN_WARNING "Send reply failed, error %d\n", err);
3886                                 break;
3887                         }
3888                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3889                 skb_pull(skb, rlen);
3890         }
3891         mutex_unlock(&rx_queue_mutex);
3892 }
3893
3894 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
3895 struct device_attribute dev_attr_##_prefix##_##_name =  \
3896         __ATTR(_name,_mode,_show,_store)
3897
3898 /*
3899  * iSCSI connection attrs
3900  */
3901 #define iscsi_conn_attr_show(param)                                     \
3902 static ssize_t                                                          \
3903 show_conn_param_##param(struct device *dev,                             \
3904                         struct device_attribute *attr, char *buf)       \
3905 {                                                                       \
3906         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3907         struct iscsi_transport *t = conn->transport;                    \
3908         return t->get_conn_param(conn, param, buf);                     \
3909 }
3910
3911 #define iscsi_conn_attr(field, param)                                   \
3912         iscsi_conn_attr_show(param)                                     \
3913 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
3914                         NULL);
3915
3916 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3917 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3918 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3919 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3920 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3921 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3922 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3923 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3924 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3925 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3926 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3927 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3928 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3929 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3930 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3931 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3932 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3933 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3934 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3935 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3936 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3937 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3938 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3939 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3940 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3941 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3942 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3943 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3944
3945 static const char *const connection_state_names[] = {
3946         [ISCSI_CONN_UP] = "up",
3947         [ISCSI_CONN_DOWN] = "down",
3948         [ISCSI_CONN_FAILED] = "failed"
3949 };
3950
3951 static ssize_t show_conn_state(struct device *dev,
3952                                struct device_attribute *attr, char *buf)
3953 {
3954         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
3955         const char *state = "unknown";
3956
3957         if (conn->state >= 0 &&
3958             conn->state < ARRAY_SIZE(connection_state_names))
3959                 state = connection_state_names[conn->state];
3960
3961         return sprintf(buf, "%s\n", state);
3962 }
3963 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
3964                         NULL);
3965
3966 #define iscsi_conn_ep_attr_show(param)                                  \
3967 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
3968                                           struct device_attribute *attr,\
3969                                           char *buf)                    \
3970 {                                                                       \
3971         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3972         struct iscsi_transport *t = conn->transport;                    \
3973         struct iscsi_endpoint *ep;                                      \
3974         ssize_t rc;                                                     \
3975                                                                         \
3976         /*                                                              \
3977          * Need to make sure ep_disconnect does not free the LLD's      \
3978          * interconnect resources while we are trying to read them.     \
3979          */                                                             \
3980         mutex_lock(&conn->ep_mutex);                                    \
3981         ep = conn->ep;                                                  \
3982         if (!ep && t->ep_connect) {                                     \
3983                 mutex_unlock(&conn->ep_mutex);                          \
3984                 return -ENOTCONN;                                       \
3985         }                                                               \
3986                                                                         \
3987         if (ep)                                                         \
3988                 rc = t->get_ep_param(ep, param, buf);                   \
3989         else                                                            \
3990                 rc = t->get_conn_param(conn, param, buf);               \
3991         mutex_unlock(&conn->ep_mutex);                                  \
3992         return rc;                                                      \
3993 }
3994
3995 #define iscsi_conn_ep_attr(field, param)                                \
3996         iscsi_conn_ep_attr_show(param)                                  \
3997 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
3998                         show_conn_ep_param_##param, NULL);
3999
4000 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4001 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4002
4003 static struct attribute *iscsi_conn_attrs[] = {
4004         &dev_attr_conn_max_recv_dlength.attr,
4005         &dev_attr_conn_max_xmit_dlength.attr,
4006         &dev_attr_conn_header_digest.attr,
4007         &dev_attr_conn_data_digest.attr,
4008         &dev_attr_conn_ifmarker.attr,
4009         &dev_attr_conn_ofmarker.attr,
4010         &dev_attr_conn_address.attr,
4011         &dev_attr_conn_port.attr,
4012         &dev_attr_conn_exp_statsn.attr,
4013         &dev_attr_conn_persistent_address.attr,
4014         &dev_attr_conn_persistent_port.attr,
4015         &dev_attr_conn_ping_tmo.attr,
4016         &dev_attr_conn_recv_tmo.attr,
4017         &dev_attr_conn_local_port.attr,
4018         &dev_attr_conn_statsn.attr,
4019         &dev_attr_conn_keepalive_tmo.attr,
4020         &dev_attr_conn_max_segment_size.attr,
4021         &dev_attr_conn_tcp_timestamp_stat.attr,
4022         &dev_attr_conn_tcp_wsf_disable.attr,
4023         &dev_attr_conn_tcp_nagle_disable.attr,
4024         &dev_attr_conn_tcp_timer_scale.attr,
4025         &dev_attr_conn_tcp_timestamp_enable.attr,
4026         &dev_attr_conn_fragment_disable.attr,
4027         &dev_attr_conn_ipv4_tos.attr,
4028         &dev_attr_conn_ipv6_traffic_class.attr,
4029         &dev_attr_conn_ipv6_flow_label.attr,
4030         &dev_attr_conn_is_fw_assigned_ipv6.attr,
4031         &dev_attr_conn_tcp_xmit_wsf.attr,
4032         &dev_attr_conn_tcp_recv_wsf.attr,
4033         &dev_attr_conn_local_ipaddr.attr,
4034         &dev_attr_conn_state.attr,
4035         NULL,
4036 };
4037
4038 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4039                                          struct attribute *attr, int i)
4040 {
4041         struct device *cdev = container_of(kobj, struct device, kobj);
4042         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4043         struct iscsi_transport *t = conn->transport;
4044         int param;
4045
4046         if (attr == &dev_attr_conn_max_recv_dlength.attr)
4047                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4048         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4049                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4050         else if (attr == &dev_attr_conn_header_digest.attr)
4051                 param = ISCSI_PARAM_HDRDGST_EN;
4052         else if (attr == &dev_attr_conn_data_digest.attr)
4053                 param = ISCSI_PARAM_DATADGST_EN;
4054         else if (attr == &dev_attr_conn_ifmarker.attr)
4055                 param = ISCSI_PARAM_IFMARKER_EN;
4056         else if (attr == &dev_attr_conn_ofmarker.attr)
4057                 param = ISCSI_PARAM_OFMARKER_EN;
4058         else if (attr == &dev_attr_conn_address.attr)
4059                 param = ISCSI_PARAM_CONN_ADDRESS;
4060         else if (attr == &dev_attr_conn_port.attr)
4061                 param = ISCSI_PARAM_CONN_PORT;
4062         else if (attr == &dev_attr_conn_exp_statsn.attr)
4063                 param = ISCSI_PARAM_EXP_STATSN;
4064         else if (attr == &dev_attr_conn_persistent_address.attr)
4065                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4066         else if (attr == &dev_attr_conn_persistent_port.attr)
4067                 param = ISCSI_PARAM_PERSISTENT_PORT;
4068         else if (attr == &dev_attr_conn_ping_tmo.attr)
4069                 param = ISCSI_PARAM_PING_TMO;
4070         else if (attr == &dev_attr_conn_recv_tmo.attr)
4071                 param = ISCSI_PARAM_RECV_TMO;
4072         else if (attr == &dev_attr_conn_local_port.attr)
4073                 param = ISCSI_PARAM_LOCAL_PORT;
4074         else if (attr == &dev_attr_conn_statsn.attr)
4075                 param = ISCSI_PARAM_STATSN;
4076         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4077                 param = ISCSI_PARAM_KEEPALIVE_TMO;
4078         else if (attr == &dev_attr_conn_max_segment_size.attr)
4079                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4080         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4081                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4082         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4083                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
4084         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4085                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4086         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4087                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
4088         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4089                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4090         else if (attr == &dev_attr_conn_fragment_disable.attr)
4091                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4092         else if (attr == &dev_attr_conn_ipv4_tos.attr)
4093                 param = ISCSI_PARAM_IPV4_TOS;
4094         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4095                 param = ISCSI_PARAM_IPV6_TC;
4096         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4097                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4098         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4099                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4100         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4101                 param = ISCSI_PARAM_TCP_XMIT_WSF;
4102         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4103                 param = ISCSI_PARAM_TCP_RECV_WSF;
4104         else if (attr == &dev_attr_conn_local_ipaddr.attr)
4105                 param = ISCSI_PARAM_LOCAL_IPADDR;
4106         else if (attr == &dev_attr_conn_state.attr)
4107                 return S_IRUGO;
4108         else {
4109                 WARN_ONCE(1, "Invalid conn attr");
4110                 return 0;
4111         }
4112
4113         return t->attr_is_visible(ISCSI_PARAM, param);
4114 }
4115
4116 static struct attribute_group iscsi_conn_group = {
4117         .attrs = iscsi_conn_attrs,
4118         .is_visible = iscsi_conn_attr_is_visible,
4119 };
4120
4121 /*
4122  * iSCSI session attrs
4123  */
4124 #define iscsi_session_attr_show(param, perm)                            \
4125 static ssize_t                                                          \
4126 show_session_param_##param(struct device *dev,                          \
4127                            struct device_attribute *attr, char *buf)    \
4128 {                                                                       \
4129         struct iscsi_cls_session *session =                             \
4130                 iscsi_dev_to_session(dev->parent);                      \
4131         struct iscsi_transport *t = session->transport;                 \
4132                                                                         \
4133         if (perm && !capable(CAP_SYS_ADMIN))                            \
4134                 return -EACCES;                                         \
4135         return t->get_session_param(session, param, buf);               \
4136 }
4137
4138 #define iscsi_session_attr(field, param, perm)                          \
4139         iscsi_session_attr_show(param, perm)                            \
4140 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4141                         NULL);
4142 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4143 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4144 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4145 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4146 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4147 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4148 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4149 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4150 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4151 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4152 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4153 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4154 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4155 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4156 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4157 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4158 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4159 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4160 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4161 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4162 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4163 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4164 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4165 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4166 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4167 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4168 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4169 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4170 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4171 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4172 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4173 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4174 iscsi_session_attr(discovery_auth_optional,
4175                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4176 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4177 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4178 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4179 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4180 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4181 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4182 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4183
4184 static ssize_t
4185 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4186                         char *buf)
4187 {
4188         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4189         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
4190 }
4191 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4192                         NULL);
4193 static ssize_t
4194 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4195                         char *buf)
4196 {
4197         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4198         return sprintf(buf, "%d\n", session->creator);
4199 }
4200 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4201                         NULL);
4202 static ssize_t
4203 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4204                             char *buf)
4205 {
4206         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4207         return sprintf(buf, "%d\n", session->target_id);
4208 }
4209 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4210                         show_priv_session_target_id, NULL);
4211
4212 #define iscsi_priv_session_attr_show(field, format)                     \
4213 static ssize_t                                                          \
4214 show_priv_session_##field(struct device *dev,                           \
4215                           struct device_attribute *attr, char *buf)     \
4216 {                                                                       \
4217         struct iscsi_cls_session *session =                             \
4218                         iscsi_dev_to_session(dev->parent);              \
4219         if (session->field == -1)                                       \
4220                 return sprintf(buf, "off\n");                           \
4221         return sprintf(buf, format"\n", session->field);                \
4222 }
4223
4224 #define iscsi_priv_session_attr_store(field)                            \
4225 static ssize_t                                                          \
4226 store_priv_session_##field(struct device *dev,                          \
4227                            struct device_attribute *attr,               \
4228                            const char *buf, size_t count)               \
4229 {                                                                       \
4230         int val;                                                        \
4231         char *cp;                                                       \
4232         struct iscsi_cls_session *session =                             \
4233                 iscsi_dev_to_session(dev->parent);                      \
4234         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4235             (session->state == ISCSI_SESSION_FAILED))                   \
4236                 return -EBUSY;                                          \
4237         if (strncmp(buf, "off", 3) == 0) {                              \
4238                 session->field = -1;                                    \
4239                 session->field##_sysfs_override = true;                 \
4240         } else {                                                        \
4241                 val = simple_strtoul(buf, &cp, 0);                      \
4242                 if (*cp != '\0' && *cp != '\n')                         \
4243                         return -EINVAL;                                 \
4244                 session->field = val;                                   \
4245                 session->field##_sysfs_override = true;                 \
4246         }                                                               \
4247         return count;                                                   \
4248 }
4249
4250 #define iscsi_priv_session_rw_attr(field, format)                       \
4251         iscsi_priv_session_attr_show(field, format)                     \
4252         iscsi_priv_session_attr_store(field)                            \
4253 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4254                         show_priv_session_##field,                      \
4255                         store_priv_session_##field)
4256
4257 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4258
4259 static struct attribute *iscsi_session_attrs[] = {
4260         &dev_attr_sess_initial_r2t.attr,
4261         &dev_attr_sess_max_outstanding_r2t.attr,
4262         &dev_attr_sess_immediate_data.attr,
4263         &dev_attr_sess_first_burst_len.attr,
4264         &dev_attr_sess_max_burst_len.attr,
4265         &dev_attr_sess_data_pdu_in_order.attr,
4266         &dev_attr_sess_data_seq_in_order.attr,
4267         &dev_attr_sess_erl.attr,
4268         &dev_attr_sess_targetname.attr,
4269         &dev_attr_sess_tpgt.attr,
4270         &dev_attr_sess_password.attr,
4271         &dev_attr_sess_password_in.attr,
4272         &dev_attr_sess_username.attr,
4273         &dev_attr_sess_username_in.attr,
4274         &dev_attr_sess_fast_abort.attr,
4275         &dev_attr_sess_abort_tmo.attr,
4276         &dev_attr_sess_lu_reset_tmo.attr,
4277         &dev_attr_sess_tgt_reset_tmo.attr,
4278         &dev_attr_sess_ifacename.attr,
4279         &dev_attr_sess_initiatorname.attr,
4280         &dev_attr_sess_targetalias.attr,
4281         &dev_attr_sess_boot_root.attr,
4282         &dev_attr_sess_boot_nic.attr,
4283         &dev_attr_sess_boot_target.attr,
4284         &dev_attr_priv_sess_recovery_tmo.attr,
4285         &dev_attr_priv_sess_state.attr,
4286         &dev_attr_priv_sess_creator.attr,
4287         &dev_attr_sess_chap_out_idx.attr,
4288         &dev_attr_sess_chap_in_idx.attr,
4289         &dev_attr_priv_sess_target_id.attr,
4290         &dev_attr_sess_auto_snd_tgt_disable.attr,
4291         &dev_attr_sess_discovery_session.attr,
4292         &dev_attr_sess_portal_type.attr,
4293         &dev_attr_sess_chap_auth.attr,
4294         &dev_attr_sess_discovery_logout.attr,
4295         &dev_attr_sess_bidi_chap.attr,
4296         &dev_attr_sess_discovery_auth_optional.attr,
4297         &dev_attr_sess_def_time2wait.attr,
4298         &dev_attr_sess_def_time2retain.attr,
4299         &dev_attr_sess_isid.attr,
4300         &dev_attr_sess_tsid.attr,
4301         &dev_attr_sess_def_taskmgmt_tmo.attr,
4302         &dev_attr_sess_discovery_parent_idx.attr,
4303         &dev_attr_sess_discovery_parent_type.attr,
4304         NULL,
4305 };
4306
4307 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4308                                             struct attribute *attr, int i)
4309 {
4310         struct device *cdev = container_of(kobj, struct device, kobj);
4311         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4312         struct iscsi_transport *t = session->transport;
4313         int param;
4314
4315         if (attr == &dev_attr_sess_initial_r2t.attr)
4316                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4317         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4318                 param = ISCSI_PARAM_MAX_R2T;
4319         else if (attr == &dev_attr_sess_immediate_data.attr)
4320                 param = ISCSI_PARAM_IMM_DATA_EN;
4321         else if (attr == &dev_attr_sess_first_burst_len.attr)
4322                 param = ISCSI_PARAM_FIRST_BURST;
4323         else if (attr == &dev_attr_sess_max_burst_len.attr)
4324                 param = ISCSI_PARAM_MAX_BURST;
4325         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4326                 param = ISCSI_PARAM_PDU_INORDER_EN;
4327         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4328                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4329         else if (attr == &dev_attr_sess_erl.attr)
4330                 param = ISCSI_PARAM_ERL;
4331         else if (attr == &dev_attr_sess_targetname.attr)
4332                 param = ISCSI_PARAM_TARGET_NAME;
4333         else if (attr == &dev_attr_sess_tpgt.attr)
4334                 param = ISCSI_PARAM_TPGT;
4335         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4336                 param = ISCSI_PARAM_CHAP_IN_IDX;
4337         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4338                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4339         else if (attr == &dev_attr_sess_password.attr)
4340                 param = ISCSI_PARAM_USERNAME;
4341         else if (attr == &dev_attr_sess_password_in.attr)
4342                 param = ISCSI_PARAM_USERNAME_IN;
4343         else if (attr == &dev_attr_sess_username.attr)
4344                 param = ISCSI_PARAM_PASSWORD;
4345         else if (attr == &dev_attr_sess_username_in.attr)
4346                 param = ISCSI_PARAM_PASSWORD_IN;
4347         else if (attr == &dev_attr_sess_fast_abort.attr)
4348                 param = ISCSI_PARAM_FAST_ABORT;
4349         else if (attr == &dev_attr_sess_abort_tmo.attr)
4350                 param = ISCSI_PARAM_ABORT_TMO;
4351         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4352                 param = ISCSI_PARAM_LU_RESET_TMO;
4353         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4354                 param = ISCSI_PARAM_TGT_RESET_TMO;
4355         else if (attr == &dev_attr_sess_ifacename.attr)
4356                 param = ISCSI_PARAM_IFACE_NAME;
4357         else if (attr == &dev_attr_sess_initiatorname.attr)
4358                 param = ISCSI_PARAM_INITIATOR_NAME;
4359         else if (attr == &dev_attr_sess_targetalias.attr)
4360                 param = ISCSI_PARAM_TARGET_ALIAS;
4361         else if (attr == &dev_attr_sess_boot_root.attr)
4362                 param = ISCSI_PARAM_BOOT_ROOT;
4363         else if (attr == &dev_attr_sess_boot_nic.attr)
4364                 param = ISCSI_PARAM_BOOT_NIC;
4365         else if (attr == &dev_attr_sess_boot_target.attr)
4366                 param = ISCSI_PARAM_BOOT_TARGET;
4367         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4368                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4369         else if (attr == &dev_attr_sess_discovery_session.attr)
4370                 param = ISCSI_PARAM_DISCOVERY_SESS;
4371         else if (attr == &dev_attr_sess_portal_type.attr)
4372                 param = ISCSI_PARAM_PORTAL_TYPE;
4373         else if (attr == &dev_attr_sess_chap_auth.attr)
4374                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4375         else if (attr == &dev_attr_sess_discovery_logout.attr)
4376                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4377         else if (attr == &dev_attr_sess_bidi_chap.attr)
4378                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4379         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4380                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4381         else if (attr == &dev_attr_sess_def_time2wait.attr)
4382                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4383         else if (attr == &dev_attr_sess_def_time2retain.attr)
4384                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4385         else if (attr == &dev_attr_sess_isid.attr)
4386                 param = ISCSI_PARAM_ISID;
4387         else if (attr == &dev_attr_sess_tsid.attr)
4388                 param = ISCSI_PARAM_TSID;
4389         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4390                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4391         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4392                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4393         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4394                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4395         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4396                 return S_IRUGO | S_IWUSR;
4397         else if (attr == &dev_attr_priv_sess_state.attr)
4398                 return S_IRUGO;
4399         else if (attr == &dev_attr_priv_sess_creator.attr)
4400                 return S_IRUGO;
4401         else if (attr == &dev_attr_priv_sess_target_id.attr)
4402                 return S_IRUGO;
4403         else {
4404                 WARN_ONCE(1, "Invalid session attr");
4405                 return 0;
4406         }
4407
4408         return t->attr_is_visible(ISCSI_PARAM, param);
4409 }
4410
4411 static struct attribute_group iscsi_session_group = {
4412         .attrs = iscsi_session_attrs,
4413         .is_visible = iscsi_session_attr_is_visible,
4414 };
4415
4416 /*
4417  * iSCSI host attrs
4418  */
4419 #define iscsi_host_attr_show(param)                                     \
4420 static ssize_t                                                          \
4421 show_host_param_##param(struct device *dev,                             \
4422                         struct device_attribute *attr, char *buf)       \
4423 {                                                                       \
4424         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4425         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4426         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4427 }
4428
4429 #define iscsi_host_attr(field, param)                                   \
4430         iscsi_host_attr_show(param)                                     \
4431 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4432                         NULL);
4433
4434 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4435 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4436 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4437 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4438 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4439 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4440
4441 static struct attribute *iscsi_host_attrs[] = {
4442         &dev_attr_host_netdev.attr,
4443         &dev_attr_host_hwaddress.attr,
4444         &dev_attr_host_ipaddress.attr,
4445         &dev_attr_host_initiatorname.attr,
4446         &dev_attr_host_port_state.attr,
4447         &dev_attr_host_port_speed.attr,
4448         NULL,
4449 };
4450
4451 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4452                                          struct attribute *attr, int i)
4453 {
4454         struct device *cdev = container_of(kobj, struct device, kobj);
4455         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4456         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4457         int param;
4458
4459         if (attr == &dev_attr_host_netdev.attr)
4460                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4461         else if (attr == &dev_attr_host_hwaddress.attr)
4462                 param = ISCSI_HOST_PARAM_HWADDRESS;
4463         else if (attr == &dev_attr_host_ipaddress.attr)
4464                 param = ISCSI_HOST_PARAM_IPADDRESS;
4465         else if (attr == &dev_attr_host_initiatorname.attr)
4466                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4467         else if (attr == &dev_attr_host_port_state.attr)
4468                 param = ISCSI_HOST_PARAM_PORT_STATE;
4469         else if (attr == &dev_attr_host_port_speed.attr)
4470                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4471         else {
4472                 WARN_ONCE(1, "Invalid host attr");
4473                 return 0;
4474         }
4475
4476         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4477 }
4478
4479 static struct attribute_group iscsi_host_group = {
4480         .attrs = iscsi_host_attrs,
4481         .is_visible = iscsi_host_attr_is_visible,
4482 };
4483
4484 /* convert iscsi_port_speed values to ascii string name */
4485 static const struct {
4486         enum iscsi_port_speed   value;
4487         char                    *name;
4488 } iscsi_port_speed_names[] = {
4489         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4490         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4491         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4492         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4493         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4494         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4495         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4496 };
4497
4498 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4499 {
4500         int i;
4501         char *speed = "Unknown!";
4502         struct iscsi_cls_host *ihost = shost->shost_data;
4503         uint32_t port_speed = ihost->port_speed;
4504
4505         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4506                 if (iscsi_port_speed_names[i].value & port_speed) {
4507                         speed = iscsi_port_speed_names[i].name;
4508                         break;
4509                 }
4510         }
4511         return speed;
4512 }
4513 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4514
4515 /* convert iscsi_port_state values to ascii string name */
4516 static const struct {
4517         enum iscsi_port_state   value;
4518         char                    *name;
4519 } iscsi_port_state_names[] = {
4520         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4521         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4522 };
4523
4524 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4525 {
4526         int i;
4527         char *state = "Unknown!";
4528         struct iscsi_cls_host *ihost = shost->shost_data;
4529         uint32_t port_state = ihost->port_state;
4530
4531         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4532                 if (iscsi_port_state_names[i].value & port_state) {
4533                         state = iscsi_port_state_names[i].name;
4534                         break;
4535                 }
4536         }
4537         return state;
4538 }
4539 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4540
4541 static int iscsi_session_match(struct attribute_container *cont,
4542                            struct device *dev)
4543 {
4544         struct iscsi_cls_session *session;
4545         struct Scsi_Host *shost;
4546         struct iscsi_internal *priv;
4547
4548         if (!iscsi_is_session_dev(dev))
4549                 return 0;
4550
4551         session = iscsi_dev_to_session(dev);
4552         shost = iscsi_session_to_shost(session);
4553         if (!shost->transportt)
4554                 return 0;
4555
4556         priv = to_iscsi_internal(shost->transportt);
4557         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4558                 return 0;
4559
4560         return &priv->session_cont.ac == cont;
4561 }
4562
4563 static int iscsi_conn_match(struct attribute_container *cont,
4564                            struct device *dev)
4565 {
4566         struct iscsi_cls_session *session;
4567         struct iscsi_cls_conn *conn;
4568         struct Scsi_Host *shost;
4569         struct iscsi_internal *priv;
4570
4571         if (!iscsi_is_conn_dev(dev))
4572                 return 0;
4573
4574         conn = iscsi_dev_to_conn(dev);
4575         session = iscsi_dev_to_session(conn->dev.parent);
4576         shost = iscsi_session_to_shost(session);
4577
4578         if (!shost->transportt)
4579                 return 0;
4580
4581         priv = to_iscsi_internal(shost->transportt);
4582         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4583                 return 0;
4584
4585         return &priv->conn_cont.ac == cont;
4586 }
4587
4588 static int iscsi_host_match(struct attribute_container *cont,
4589                             struct device *dev)
4590 {
4591         struct Scsi_Host *shost;
4592         struct iscsi_internal *priv;
4593
4594         if (!scsi_is_host_device(dev))
4595                 return 0;
4596
4597         shost = dev_to_shost(dev);
4598         if (!shost->transportt  ||
4599             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4600                 return 0;
4601
4602         priv = to_iscsi_internal(shost->transportt);
4603         return &priv->t.host_attrs.ac == cont;
4604 }
4605
4606 struct scsi_transport_template *
4607 iscsi_register_transport(struct iscsi_transport *tt)
4608 {
4609         struct iscsi_internal *priv;
4610         unsigned long flags;
4611         int err;
4612
4613         BUG_ON(!tt);
4614
4615         priv = iscsi_if_transport_lookup(tt);
4616         if (priv)
4617                 return NULL;
4618
4619         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4620         if (!priv)
4621                 return NULL;
4622         INIT_LIST_HEAD(&priv->list);
4623         priv->iscsi_transport = tt;
4624         priv->t.user_scan = iscsi_user_scan;
4625         priv->t.create_work_queue = 1;
4626
4627         priv->dev.class = &iscsi_transport_class;
4628         dev_set_name(&priv->dev, "%s", tt->name);
4629         err = device_register(&priv->dev);
4630         if (err)
4631                 goto free_priv;
4632
4633         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4634         if (err)
4635                 goto unregister_dev;
4636
4637         /* host parameters */
4638         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4639         priv->t.host_attrs.ac.match = iscsi_host_match;
4640         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4641         priv->t.host_size = sizeof(struct iscsi_cls_host);
4642         transport_container_register(&priv->t.host_attrs);
4643
4644         /* connection parameters */
4645         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4646         priv->conn_cont.ac.match = iscsi_conn_match;
4647         priv->conn_cont.ac.grp = &iscsi_conn_group;
4648         transport_container_register(&priv->conn_cont);
4649
4650         /* session parameters */
4651         priv->session_cont.ac.class = &iscsi_session_class.class;
4652         priv->session_cont.ac.match = iscsi_session_match;
4653         priv->session_cont.ac.grp = &iscsi_session_group;
4654         transport_container_register(&priv->session_cont);
4655
4656         spin_lock_irqsave(&iscsi_transport_lock, flags);
4657         list_add(&priv->list, &iscsi_transports);
4658         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4659
4660         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4661         return &priv->t;
4662
4663 unregister_dev:
4664         device_unregister(&priv->dev);
4665         return NULL;
4666 free_priv:
4667         kfree(priv);
4668         return NULL;
4669 }
4670 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4671
4672 int iscsi_unregister_transport(struct iscsi_transport *tt)
4673 {
4674         struct iscsi_internal *priv;
4675         unsigned long flags;
4676
4677         BUG_ON(!tt);
4678
4679         mutex_lock(&rx_queue_mutex);
4680
4681         priv = iscsi_if_transport_lookup(tt);
4682         BUG_ON (!priv);
4683
4684         spin_lock_irqsave(&iscsi_transport_lock, flags);
4685         list_del(&priv->list);
4686         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4687
4688         transport_container_unregister(&priv->conn_cont);
4689         transport_container_unregister(&priv->session_cont);
4690         transport_container_unregister(&priv->t.host_attrs);
4691
4692         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4693         device_unregister(&priv->dev);
4694         mutex_unlock(&rx_queue_mutex);
4695
4696         return 0;
4697 }
4698 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4699
4700 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4701                      struct device *dev, const char *fmt, ...)
4702 {
4703         struct va_format vaf;
4704         va_list args;
4705
4706         va_start(args, fmt);
4707         vaf.fmt = fmt;
4708         vaf.va = &args;
4709         trace(dev, &vaf);
4710         va_end(args);
4711 }
4712 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4713
4714 static __init int iscsi_transport_init(void)
4715 {
4716         int err;
4717         struct netlink_kernel_cfg cfg = {
4718                 .groups = 1,
4719                 .input  = iscsi_if_rx,
4720         };
4721         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4722                 ISCSI_TRANSPORT_VERSION);
4723
4724         atomic_set(&iscsi_session_nr, 0);
4725
4726         err = class_register(&iscsi_transport_class);
4727         if (err)
4728                 return err;
4729
4730         err = class_register(&iscsi_endpoint_class);
4731         if (err)
4732                 goto unregister_transport_class;
4733
4734         err = class_register(&iscsi_iface_class);
4735         if (err)
4736                 goto unregister_endpoint_class;
4737
4738         err = transport_class_register(&iscsi_host_class);
4739         if (err)
4740                 goto unregister_iface_class;
4741
4742         err = transport_class_register(&iscsi_connection_class);
4743         if (err)
4744                 goto unregister_host_class;
4745
4746         err = transport_class_register(&iscsi_session_class);
4747         if (err)
4748                 goto unregister_conn_class;
4749
4750         err = bus_register(&iscsi_flashnode_bus);
4751         if (err)
4752                 goto unregister_session_class;
4753
4754         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4755         if (!nls) {
4756                 err = -ENOBUFS;
4757                 goto unregister_flashnode_bus;
4758         }
4759
4760         iscsi_eh_timer_workq = alloc_workqueue("%s",
4761                         WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
4762                         1, "iscsi_eh");
4763         if (!iscsi_eh_timer_workq) {
4764                 err = -ENOMEM;
4765                 goto release_nls;
4766         }
4767
4768         iscsi_destroy_workq = alloc_workqueue("%s",
4769                         WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
4770                         1, "iscsi_destroy");
4771         if (!iscsi_destroy_workq) {
4772                 err = -ENOMEM;
4773                 goto destroy_wq;
4774         }
4775
4776         return 0;
4777
4778 destroy_wq:
4779         destroy_workqueue(iscsi_eh_timer_workq);
4780 release_nls:
4781         netlink_kernel_release(nls);
4782 unregister_flashnode_bus:
4783         bus_unregister(&iscsi_flashnode_bus);
4784 unregister_session_class:
4785         transport_class_unregister(&iscsi_session_class);
4786 unregister_conn_class:
4787         transport_class_unregister(&iscsi_connection_class);
4788 unregister_host_class:
4789         transport_class_unregister(&iscsi_host_class);
4790 unregister_iface_class:
4791         class_unregister(&iscsi_iface_class);
4792 unregister_endpoint_class:
4793         class_unregister(&iscsi_endpoint_class);
4794 unregister_transport_class:
4795         class_unregister(&iscsi_transport_class);
4796         return err;
4797 }
4798
4799 static void __exit iscsi_transport_exit(void)
4800 {
4801         destroy_workqueue(iscsi_destroy_workq);
4802         destroy_workqueue(iscsi_eh_timer_workq);
4803         netlink_kernel_release(nls);
4804         bus_unregister(&iscsi_flashnode_bus);
4805         transport_class_unregister(&iscsi_connection_class);
4806         transport_class_unregister(&iscsi_session_class);
4807         transport_class_unregister(&iscsi_host_class);
4808         class_unregister(&iscsi_endpoint_class);
4809         class_unregister(&iscsi_iface_class);
4810         class_unregister(&iscsi_transport_class);
4811 }
4812
4813 module_init(iscsi_transport_init);
4814 module_exit(iscsi_transport_exit);
4815
4816 MODULE_AUTHOR("Mike Christie <[email protected]>, "
4817               "Dmitry Yusupov <[email protected]>, "
4818               "Alex Aizman <[email protected]>");
4819 MODULE_DESCRIPTION("iSCSI Transport Interface");
4820 MODULE_LICENSE("GPL");
4821 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4822 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);