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 static LIST_HEAD(sesslist);
1620 static LIST_HEAD(sessdestroylist);
1621 static DEFINE_SPINLOCK(sesslock);
1622 static LIST_HEAD(connlist);
1623 static LIST_HEAD(connlist_err);
1624 static DEFINE_SPINLOCK(connlock);
1625
1626 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1627 {
1628         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1629         return sess->sid;
1630 }
1631
1632 /*
1633  * Returns the matching session to a given sid
1634  */
1635 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1636 {
1637         unsigned long flags;
1638         struct iscsi_cls_session *sess;
1639
1640         spin_lock_irqsave(&sesslock, flags);
1641         list_for_each_entry(sess, &sesslist, sess_list) {
1642                 if (sess->sid == sid) {
1643                         spin_unlock_irqrestore(&sesslock, flags);
1644                         return sess;
1645                 }
1646         }
1647         spin_unlock_irqrestore(&sesslock, flags);
1648         return NULL;
1649 }
1650
1651 /*
1652  * Returns the matching connection to a given sid / cid tuple
1653  */
1654 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1655 {
1656         unsigned long flags;
1657         struct iscsi_cls_conn *conn;
1658
1659         spin_lock_irqsave(&connlock, flags);
1660         list_for_each_entry(conn, &connlist, conn_list) {
1661                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1662                         spin_unlock_irqrestore(&connlock, flags);
1663                         return conn;
1664                 }
1665         }
1666         spin_unlock_irqrestore(&connlock, flags);
1667         return NULL;
1668 }
1669
1670 /*
1671  * The following functions can be used by LLDs that allocate
1672  * their own scsi_hosts or by software iscsi LLDs
1673  */
1674 static struct {
1675         int value;
1676         char *name;
1677 } iscsi_session_state_names[] = {
1678         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1679         { ISCSI_SESSION_FAILED,         "FAILED" },
1680         { ISCSI_SESSION_FREE,           "FREE" },
1681 };
1682
1683 static const char *iscsi_session_state_name(int state)
1684 {
1685         int i;
1686         char *name = NULL;
1687
1688         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1689                 if (iscsi_session_state_names[i].value == state) {
1690                         name = iscsi_session_state_names[i].name;
1691                         break;
1692                 }
1693         }
1694         return name;
1695 }
1696
1697 int iscsi_session_chkready(struct iscsi_cls_session *session)
1698 {
1699         unsigned long flags;
1700         int err;
1701
1702         spin_lock_irqsave(&session->lock, flags);
1703         switch (session->state) {
1704         case ISCSI_SESSION_LOGGED_IN:
1705                 err = 0;
1706                 break;
1707         case ISCSI_SESSION_FAILED:
1708                 err = DID_IMM_RETRY << 16;
1709                 break;
1710         case ISCSI_SESSION_FREE:
1711                 err = DID_TRANSPORT_FAILFAST << 16;
1712                 break;
1713         default:
1714                 err = DID_NO_CONNECT << 16;
1715                 break;
1716         }
1717         spin_unlock_irqrestore(&session->lock, flags);
1718         return err;
1719 }
1720 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1721
1722 int iscsi_is_session_online(struct iscsi_cls_session *session)
1723 {
1724         unsigned long flags;
1725         int ret = 0;
1726
1727         spin_lock_irqsave(&session->lock, flags);
1728         if (session->state == ISCSI_SESSION_LOGGED_IN)
1729                 ret = 1;
1730         spin_unlock_irqrestore(&session->lock, flags);
1731         return ret;
1732 }
1733 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1734
1735 static void iscsi_session_release(struct device *dev)
1736 {
1737         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1738         struct Scsi_Host *shost;
1739
1740         shost = iscsi_session_to_shost(session);
1741         scsi_host_put(shost);
1742         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1743         kfree(session);
1744 }
1745
1746 int iscsi_is_session_dev(const struct device *dev)
1747 {
1748         return dev->release == iscsi_session_release;
1749 }
1750 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1751
1752 static int iscsi_iter_session_fn(struct device *dev, void *data)
1753 {
1754         void (* fn) (struct iscsi_cls_session *) = data;
1755
1756         if (!iscsi_is_session_dev(dev))
1757                 return 0;
1758         fn(iscsi_dev_to_session(dev));
1759         return 0;
1760 }
1761
1762 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1763                                  void (*fn)(struct iscsi_cls_session *))
1764 {
1765         device_for_each_child(&shost->shost_gendev, fn,
1766                               iscsi_iter_session_fn);
1767 }
1768 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1769
1770 /**
1771  * iscsi_scan_finished - helper to report when running scans are done
1772  * @shost: scsi host
1773  * @time: scan run time
1774  *
1775  * This function can be used by drives like qla4xxx to report to the scsi
1776  * layer when the scans it kicked off at module load time are done.
1777  */
1778 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1779 {
1780         struct iscsi_cls_host *ihost = shost->shost_data;
1781         /*
1782          * qla4xxx will have kicked off some session unblocks before calling
1783          * scsi_scan_host, so just wait for them to complete.
1784          */
1785         return !atomic_read(&ihost->nr_scans);
1786 }
1787 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1788
1789 struct iscsi_scan_data {
1790         unsigned int channel;
1791         unsigned int id;
1792         u64 lun;
1793         enum scsi_scan_mode rescan;
1794 };
1795
1796 static int iscsi_user_scan_session(struct device *dev, void *data)
1797 {
1798         struct iscsi_scan_data *scan_data = data;
1799         struct iscsi_cls_session *session;
1800         struct Scsi_Host *shost;
1801         struct iscsi_cls_host *ihost;
1802         unsigned long flags;
1803         unsigned int id;
1804
1805         if (!iscsi_is_session_dev(dev))
1806                 return 0;
1807
1808         session = iscsi_dev_to_session(dev);
1809
1810         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1811
1812         shost = iscsi_session_to_shost(session);
1813         ihost = shost->shost_data;
1814
1815         mutex_lock(&ihost->mutex);
1816         spin_lock_irqsave(&session->lock, flags);
1817         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1818                 spin_unlock_irqrestore(&session->lock, flags);
1819                 goto user_scan_exit;
1820         }
1821         id = session->target_id;
1822         spin_unlock_irqrestore(&session->lock, flags);
1823
1824         if (id != ISCSI_MAX_TARGET) {
1825                 if ((scan_data->channel == SCAN_WILD_CARD ||
1826                      scan_data->channel == 0) &&
1827                     (scan_data->id == SCAN_WILD_CARD ||
1828                      scan_data->id == id))
1829                         scsi_scan_target(&session->dev, 0, id,
1830                                          scan_data->lun, scan_data->rescan);
1831         }
1832
1833 user_scan_exit:
1834         mutex_unlock(&ihost->mutex);
1835         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1836         return 0;
1837 }
1838
1839 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1840                            uint id, u64 lun)
1841 {
1842         struct iscsi_scan_data scan_data;
1843
1844         scan_data.channel = channel;
1845         scan_data.id = id;
1846         scan_data.lun = lun;
1847         scan_data.rescan = SCSI_SCAN_MANUAL;
1848
1849         return device_for_each_child(&shost->shost_gendev, &scan_data,
1850                                      iscsi_user_scan_session);
1851 }
1852
1853 static void iscsi_scan_session(struct work_struct *work)
1854 {
1855         struct iscsi_cls_session *session =
1856                         container_of(work, struct iscsi_cls_session, scan_work);
1857         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1858         struct iscsi_cls_host *ihost = shost->shost_data;
1859         struct iscsi_scan_data scan_data;
1860
1861         scan_data.channel = 0;
1862         scan_data.id = SCAN_WILD_CARD;
1863         scan_data.lun = SCAN_WILD_CARD;
1864         scan_data.rescan = SCSI_SCAN_RESCAN;
1865
1866         iscsi_user_scan_session(&session->dev, &scan_data);
1867         atomic_dec(&ihost->nr_scans);
1868 }
1869
1870 /**
1871  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1872  * @cmd: scsi cmd passed to scsi eh handler
1873  *
1874  * If the session is down this function will wait for the recovery
1875  * timer to fire or for the session to be logged back in. If the
1876  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1877  * should pass this error value to the scsi eh.
1878  */
1879 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1880 {
1881         struct iscsi_cls_session *session =
1882                         starget_to_session(scsi_target(cmd->device));
1883         unsigned long flags;
1884         int ret = 0;
1885
1886         spin_lock_irqsave(&session->lock, flags);
1887         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1888                 if (session->state == ISCSI_SESSION_FREE) {
1889                         ret = FAST_IO_FAIL;
1890                         break;
1891                 }
1892                 spin_unlock_irqrestore(&session->lock, flags);
1893                 msleep(1000);
1894                 spin_lock_irqsave(&session->lock, flags);
1895         }
1896         spin_unlock_irqrestore(&session->lock, flags);
1897         return ret;
1898 }
1899 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1900
1901 static void session_recovery_timedout(struct work_struct *work)
1902 {
1903         struct iscsi_cls_session *session =
1904                 container_of(work, struct iscsi_cls_session,
1905                              recovery_work.work);
1906         unsigned long flags;
1907
1908         iscsi_cls_session_printk(KERN_INFO, session,
1909                                  "session recovery timed out after %d secs\n",
1910                                  session->recovery_tmo);
1911
1912         spin_lock_irqsave(&session->lock, flags);
1913         switch (session->state) {
1914         case ISCSI_SESSION_FAILED:
1915                 session->state = ISCSI_SESSION_FREE;
1916                 break;
1917         case ISCSI_SESSION_LOGGED_IN:
1918         case ISCSI_SESSION_FREE:
1919                 /* we raced with the unblock's flush */
1920                 spin_unlock_irqrestore(&session->lock, flags);
1921                 return;
1922         }
1923         spin_unlock_irqrestore(&session->lock, flags);
1924
1925         if (session->transport->session_recovery_timedout)
1926                 session->transport->session_recovery_timedout(session);
1927
1928         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1929         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1930         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1931 }
1932
1933 static void __iscsi_unblock_session(struct work_struct *work)
1934 {
1935         struct iscsi_cls_session *session =
1936                         container_of(work, struct iscsi_cls_session,
1937                                      unblock_work);
1938         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1939         struct iscsi_cls_host *ihost = shost->shost_data;
1940         unsigned long flags;
1941
1942         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1943         /*
1944          * The recovery and unblock work get run from the same workqueue,
1945          * so try to cancel it if it was going to run after this unblock.
1946          */
1947         cancel_delayed_work(&session->recovery_work);
1948         spin_lock_irqsave(&session->lock, flags);
1949         session->state = ISCSI_SESSION_LOGGED_IN;
1950         spin_unlock_irqrestore(&session->lock, flags);
1951         /* start IO */
1952         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1953         /*
1954          * Only do kernel scanning if the driver is properly hooked into
1955          * the async scanning code (drivers like iscsi_tcp do login and
1956          * scanning from userspace).
1957          */
1958         if (shost->hostt->scan_finished) {
1959                 if (scsi_queue_work(shost, &session->scan_work))
1960                         atomic_inc(&ihost->nr_scans);
1961         }
1962         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1963 }
1964
1965 /**
1966  * iscsi_unblock_session - set a session as logged in and start IO.
1967  * @session: iscsi session
1968  *
1969  * Mark a session as ready to accept IO.
1970  */
1971 void iscsi_unblock_session(struct iscsi_cls_session *session)
1972 {
1973         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1974         /*
1975          * make sure all the events have completed before tell the driver
1976          * it is safe
1977          */
1978         flush_workqueue(iscsi_eh_timer_workq);
1979 }
1980 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1981
1982 static void __iscsi_block_session(struct work_struct *work)
1983 {
1984         struct iscsi_cls_session *session =
1985                         container_of(work, struct iscsi_cls_session,
1986                                      block_work);
1987         unsigned long flags;
1988
1989         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1990         spin_lock_irqsave(&session->lock, flags);
1991         session->state = ISCSI_SESSION_FAILED;
1992         spin_unlock_irqrestore(&session->lock, flags);
1993         scsi_target_block(&session->dev);
1994         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1995         if (session->recovery_tmo >= 0)
1996                 queue_delayed_work(iscsi_eh_timer_workq,
1997                                    &session->recovery_work,
1998                                    session->recovery_tmo * HZ);
1999 }
2000
2001 void iscsi_block_session(struct iscsi_cls_session *session)
2002 {
2003         queue_work(iscsi_eh_timer_workq, &session->block_work);
2004 }
2005 EXPORT_SYMBOL_GPL(iscsi_block_session);
2006
2007 static void __iscsi_unbind_session(struct work_struct *work)
2008 {
2009         struct iscsi_cls_session *session =
2010                         container_of(work, struct iscsi_cls_session,
2011                                      unbind_work);
2012         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2013         struct iscsi_cls_host *ihost = shost->shost_data;
2014         unsigned long flags;
2015         unsigned int target_id;
2016
2017         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2018
2019         /* Prevent new scans and make sure scanning is not in progress */
2020         mutex_lock(&ihost->mutex);
2021         spin_lock_irqsave(&session->lock, flags);
2022         if (session->target_id == ISCSI_MAX_TARGET) {
2023                 spin_unlock_irqrestore(&session->lock, flags);
2024                 mutex_unlock(&ihost->mutex);
2025                 goto unbind_session_exit;
2026         }
2027
2028         target_id = session->target_id;
2029         session->target_id = ISCSI_MAX_TARGET;
2030         spin_unlock_irqrestore(&session->lock, flags);
2031         mutex_unlock(&ihost->mutex);
2032
2033         if (session->ida_used)
2034                 ida_simple_remove(&iscsi_sess_ida, target_id);
2035
2036         scsi_remove_target(&session->dev);
2037
2038 unbind_session_exit:
2039         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2040         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2041 }
2042
2043 static void __iscsi_destroy_session(struct work_struct *work)
2044 {
2045         struct iscsi_cls_session *session =
2046                 container_of(work, struct iscsi_cls_session, destroy_work);
2047
2048         session->transport->destroy_session(session);
2049 }
2050
2051 struct iscsi_cls_session *
2052 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2053                     int dd_size)
2054 {
2055         struct iscsi_cls_session *session;
2056
2057         session = kzalloc(sizeof(*session) + dd_size,
2058                           GFP_KERNEL);
2059         if (!session)
2060                 return NULL;
2061
2062         session->transport = transport;
2063         session->creator = -1;
2064         session->recovery_tmo = 120;
2065         session->recovery_tmo_sysfs_override = false;
2066         session->state = ISCSI_SESSION_FREE;
2067         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2068         INIT_LIST_HEAD(&session->sess_list);
2069         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2070         INIT_WORK(&session->block_work, __iscsi_block_session);
2071         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2072         INIT_WORK(&session->scan_work, iscsi_scan_session);
2073         INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2074         spin_lock_init(&session->lock);
2075
2076         /* this is released in the dev's release function */
2077         scsi_host_get(shost);
2078         session->dev.parent = &shost->shost_gendev;
2079         session->dev.release = iscsi_session_release;
2080         device_initialize(&session->dev);
2081         if (dd_size)
2082                 session->dd_data = &session[1];
2083
2084         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2085         return session;
2086 }
2087 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2088
2089 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2090 {
2091         unsigned long flags;
2092         int id = 0;
2093         int err;
2094
2095         session->sid = atomic_add_return(1, &iscsi_session_nr);
2096
2097         if (target_id == ISCSI_MAX_TARGET) {
2098                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2099
2100                 if (id < 0) {
2101                         iscsi_cls_session_printk(KERN_ERR, session,
2102                                         "Failure in Target ID Allocation\n");
2103                         return id;
2104                 }
2105                 session->target_id = (unsigned int)id;
2106                 session->ida_used = true;
2107         } else
2108                 session->target_id = target_id;
2109
2110         dev_set_name(&session->dev, "session%u", session->sid);
2111         err = device_add(&session->dev);
2112         if (err) {
2113                 iscsi_cls_session_printk(KERN_ERR, session,
2114                                          "could not register session's dev\n");
2115                 goto release_ida;
2116         }
2117         err = transport_register_device(&session->dev);
2118         if (err) {
2119                 iscsi_cls_session_printk(KERN_ERR, session,
2120                                          "could not register transport's dev\n");
2121                 goto release_dev;
2122         }
2123
2124         spin_lock_irqsave(&sesslock, flags);
2125         list_add(&session->sess_list, &sesslist);
2126         spin_unlock_irqrestore(&sesslock, flags);
2127
2128         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2129         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2130         return 0;
2131
2132 release_dev:
2133         device_del(&session->dev);
2134 release_ida:
2135         if (session->ida_used)
2136                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2137
2138         return err;
2139 }
2140 EXPORT_SYMBOL_GPL(iscsi_add_session);
2141
2142 /**
2143  * iscsi_create_session - create iscsi class session
2144  * @shost: scsi host
2145  * @transport: iscsi transport
2146  * @dd_size: private driver data size
2147  * @target_id: which target
2148  *
2149  * This can be called from a LLD or iscsi_transport.
2150  */
2151 struct iscsi_cls_session *
2152 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2153                      int dd_size, unsigned int target_id)
2154 {
2155         struct iscsi_cls_session *session;
2156
2157         session = iscsi_alloc_session(shost, transport, dd_size);
2158         if (!session)
2159                 return NULL;
2160
2161         if (iscsi_add_session(session, target_id)) {
2162                 iscsi_free_session(session);
2163                 return NULL;
2164         }
2165         return session;
2166 }
2167 EXPORT_SYMBOL_GPL(iscsi_create_session);
2168
2169 static void iscsi_conn_release(struct device *dev)
2170 {
2171         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2172         struct device *parent = conn->dev.parent;
2173
2174         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2175         kfree(conn);
2176         put_device(parent);
2177 }
2178
2179 static int iscsi_is_conn_dev(const struct device *dev)
2180 {
2181         return dev->release == iscsi_conn_release;
2182 }
2183
2184 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2185 {
2186         if (!iscsi_is_conn_dev(dev))
2187                 return 0;
2188         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2189 }
2190
2191 void iscsi_remove_session(struct iscsi_cls_session *session)
2192 {
2193         unsigned long flags;
2194         int err;
2195
2196         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2197
2198         spin_lock_irqsave(&sesslock, flags);
2199         list_del(&session->sess_list);
2200         spin_unlock_irqrestore(&sesslock, flags);
2201
2202         /* make sure there are no blocks/unblocks queued */
2203         flush_workqueue(iscsi_eh_timer_workq);
2204         /* make sure the timedout callout is not running */
2205         if (!cancel_delayed_work(&session->recovery_work))
2206                 flush_workqueue(iscsi_eh_timer_workq);
2207         /*
2208          * If we are blocked let commands flow again. The lld or iscsi
2209          * layer should set up the queuecommand to fail commands.
2210          * We assume that LLD will not be calling block/unblock while
2211          * removing the session.
2212          */
2213         spin_lock_irqsave(&session->lock, flags);
2214         session->state = ISCSI_SESSION_FREE;
2215         spin_unlock_irqrestore(&session->lock, flags);
2216
2217         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2218         /* flush running scans then delete devices */
2219         flush_work(&session->scan_work);
2220         /* flush running unbind operations */
2221         flush_work(&session->unbind_work);
2222         __iscsi_unbind_session(&session->unbind_work);
2223
2224         /* hw iscsi may not have removed all connections from session */
2225         err = device_for_each_child(&session->dev, NULL,
2226                                     iscsi_iter_destroy_conn_fn);
2227         if (err)
2228                 iscsi_cls_session_printk(KERN_ERR, session,
2229                                          "Could not delete all connections "
2230                                          "for session. Error %d.\n", err);
2231
2232         transport_unregister_device(&session->dev);
2233
2234         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2235         device_del(&session->dev);
2236 }
2237 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2238
2239 void iscsi_free_session(struct iscsi_cls_session *session)
2240 {
2241         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2242         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2243         put_device(&session->dev);
2244 }
2245 EXPORT_SYMBOL_GPL(iscsi_free_session);
2246
2247 /**
2248  * iscsi_create_conn - create iscsi class connection
2249  * @session: iscsi cls session
2250  * @dd_size: private driver data size
2251  * @cid: connection id
2252  *
2253  * This can be called from a LLD or iscsi_transport. The connection
2254  * is child of the session so cid must be unique for all connections
2255  * on the session.
2256  *
2257  * Since we do not support MCS, cid will normally be zero. In some cases
2258  * for software iscsi we could be trying to preallocate a connection struct
2259  * in which case there could be two connection structs and cid would be
2260  * non-zero.
2261  */
2262 struct iscsi_cls_conn *
2263 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2264 {
2265         struct iscsi_transport *transport = session->transport;
2266         struct iscsi_cls_conn *conn;
2267         unsigned long flags;
2268         int err;
2269
2270         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2271         if (!conn)
2272                 return NULL;
2273         if (dd_size)
2274                 conn->dd_data = &conn[1];
2275
2276         mutex_init(&conn->ep_mutex);
2277         INIT_LIST_HEAD(&conn->conn_list);
2278         INIT_LIST_HEAD(&conn->conn_list_err);
2279         conn->transport = transport;
2280         conn->cid = cid;
2281         conn->state = ISCSI_CONN_DOWN;
2282
2283         /* this is released in the dev's release function */
2284         if (!get_device(&session->dev))
2285                 goto free_conn;
2286
2287         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2288         conn->dev.parent = &session->dev;
2289         conn->dev.release = iscsi_conn_release;
2290         err = device_register(&conn->dev);
2291         if (err) {
2292                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2293                                          "register connection's dev\n");
2294                 goto release_parent_ref;
2295         }
2296         err = transport_register_device(&conn->dev);
2297         if (err) {
2298                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2299                                          "register transport's dev\n");
2300                 goto release_conn_ref;
2301         }
2302
2303         spin_lock_irqsave(&connlock, flags);
2304         list_add(&conn->conn_list, &connlist);
2305         spin_unlock_irqrestore(&connlock, flags);
2306
2307         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2308         return conn;
2309
2310 release_conn_ref:
2311         put_device(&conn->dev);
2312 release_parent_ref:
2313         put_device(&session->dev);
2314 free_conn:
2315         kfree(conn);
2316         return NULL;
2317 }
2318
2319 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2320
2321 /**
2322  * iscsi_destroy_conn - destroy iscsi class connection
2323  * @conn: iscsi cls session
2324  *
2325  * This can be called from a LLD or iscsi_transport.
2326  */
2327 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2328 {
2329         unsigned long flags;
2330
2331         spin_lock_irqsave(&connlock, flags);
2332         list_del(&conn->conn_list);
2333         list_del(&conn->conn_list_err);
2334         spin_unlock_irqrestore(&connlock, flags);
2335
2336         transport_unregister_device(&conn->dev);
2337         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2338         device_unregister(&conn->dev);
2339         return 0;
2340 }
2341 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2342
2343 /*
2344  * iscsi interface functions
2345  */
2346 static struct iscsi_internal *
2347 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2348 {
2349         struct iscsi_internal *priv;
2350         unsigned long flags;
2351
2352         spin_lock_irqsave(&iscsi_transport_lock, flags);
2353         list_for_each_entry(priv, &iscsi_transports, list) {
2354                 if (tt == priv->iscsi_transport) {
2355                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2356                         return priv;
2357                 }
2358         }
2359         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2360         return NULL;
2361 }
2362
2363 static int
2364 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2365 {
2366         return nlmsg_multicast(nls, skb, 0, group, gfp);
2367 }
2368
2369 static int
2370 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2371 {
2372         return nlmsg_unicast(nls, skb, portid);
2373 }
2374
2375 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2376                    char *data, uint32_t data_size)
2377 {
2378         struct nlmsghdr *nlh;
2379         struct sk_buff *skb;
2380         struct iscsi_uevent *ev;
2381         char *pdu;
2382         struct iscsi_internal *priv;
2383         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2384                                    data_size);
2385
2386         priv = iscsi_if_transport_lookup(conn->transport);
2387         if (!priv)
2388                 return -EINVAL;
2389
2390         skb = alloc_skb(len, GFP_ATOMIC);
2391         if (!skb) {
2392                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2393                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2394                                       "control PDU: OOM\n");
2395                 return -ENOMEM;
2396         }
2397
2398         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2399         ev = nlmsg_data(nlh);
2400         memset(ev, 0, sizeof(*ev));
2401         ev->transport_handle = iscsi_handle(conn->transport);
2402         ev->type = ISCSI_KEVENT_RECV_PDU;
2403         ev->r.recv_req.cid = conn->cid;
2404         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2405         pdu = (char*)ev + sizeof(*ev);
2406         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2407         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2408
2409         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2410 }
2411 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2412
2413 int iscsi_offload_mesg(struct Scsi_Host *shost,
2414                        struct iscsi_transport *transport, uint32_t type,
2415                        char *data, uint16_t data_size)
2416 {
2417         struct nlmsghdr *nlh;
2418         struct sk_buff *skb;
2419         struct iscsi_uevent *ev;
2420         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2421
2422         skb = alloc_skb(len, GFP_ATOMIC);
2423         if (!skb) {
2424                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2425                 return -ENOMEM;
2426         }
2427
2428         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2429         ev = nlmsg_data(nlh);
2430         memset(ev, 0, sizeof(*ev));
2431         ev->type = type;
2432         ev->transport_handle = iscsi_handle(transport);
2433         switch (type) {
2434         case ISCSI_KEVENT_PATH_REQ:
2435                 ev->r.req_path.host_no = shost->host_no;
2436                 break;
2437         case ISCSI_KEVENT_IF_DOWN:
2438                 ev->r.notify_if_down.host_no = shost->host_no;
2439                 break;
2440         }
2441
2442         memcpy((char *)ev + sizeof(*ev), data, data_size);
2443
2444         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2445 }
2446 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2447
2448 static void stop_conn_work_fn(struct work_struct *work)
2449 {
2450         struct iscsi_cls_conn *conn, *tmp;
2451         unsigned long flags;
2452         LIST_HEAD(recovery_list);
2453
2454         spin_lock_irqsave(&connlock, flags);
2455         if (list_empty(&connlist_err)) {
2456                 spin_unlock_irqrestore(&connlock, flags);
2457                 return;
2458         }
2459         list_splice_init(&connlist_err, &recovery_list);
2460         spin_unlock_irqrestore(&connlock, flags);
2461
2462         list_for_each_entry_safe(conn, tmp, &recovery_list, conn_list_err) {
2463                 uint32_t sid = iscsi_conn_get_sid(conn);
2464                 struct iscsi_cls_session *session;
2465
2466                 mutex_lock(&rx_queue_mutex);
2467
2468                 session = iscsi_session_lookup(sid);
2469                 if (session) {
2470                         if (system_state != SYSTEM_RUNNING) {
2471                                 session->recovery_tmo = 0;
2472                                 conn->transport->stop_conn(conn,
2473                                                            STOP_CONN_TERM);
2474                         } else {
2475                                 conn->transport->stop_conn(conn,
2476                                                            STOP_CONN_RECOVER);
2477                         }
2478                 }
2479
2480                 list_del_init(&conn->conn_list_err);
2481
2482                 mutex_unlock(&rx_queue_mutex);
2483
2484                 /* we don't want to hold rx_queue_mutex for too long,
2485                  * for instance if many conns failed at the same time,
2486                  * since this stall other iscsi maintenance operations.
2487                  * Give other users a chance to proceed.
2488                  */
2489                 cond_resched();
2490         }
2491 }
2492
2493 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2494 {
2495         struct nlmsghdr *nlh;
2496         struct sk_buff  *skb;
2497         struct iscsi_uevent *ev;
2498         struct iscsi_internal *priv;
2499         int len = nlmsg_total_size(sizeof(*ev));
2500         unsigned long flags;
2501
2502         spin_lock_irqsave(&connlock, flags);
2503         list_add(&conn->conn_list_err, &connlist_err);
2504         spin_unlock_irqrestore(&connlock, flags);
2505         queue_work(system_unbound_wq, &stop_conn_work);
2506
2507         priv = iscsi_if_transport_lookup(conn->transport);
2508         if (!priv)
2509                 return;
2510
2511         skb = alloc_skb(len, GFP_ATOMIC);
2512         if (!skb) {
2513                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2514                                       "conn error (%d)\n", error);
2515                 return;
2516         }
2517
2518         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2519         ev = nlmsg_data(nlh);
2520         ev->transport_handle = iscsi_handle(conn->transport);
2521         ev->type = ISCSI_KEVENT_CONN_ERROR;
2522         ev->r.connerror.error = error;
2523         ev->r.connerror.cid = conn->cid;
2524         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2525
2526         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2527
2528         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2529                               error);
2530 }
2531 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2532
2533 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2534                             enum iscsi_conn_state state)
2535 {
2536         struct nlmsghdr *nlh;
2537         struct sk_buff  *skb;
2538         struct iscsi_uevent *ev;
2539         struct iscsi_internal *priv;
2540         int len = nlmsg_total_size(sizeof(*ev));
2541
2542         priv = iscsi_if_transport_lookup(conn->transport);
2543         if (!priv)
2544                 return;
2545
2546         skb = alloc_skb(len, GFP_ATOMIC);
2547         if (!skb) {
2548                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2549                                       "conn login (%d)\n", state);
2550                 return;
2551         }
2552
2553         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2554         ev = nlmsg_data(nlh);
2555         ev->transport_handle = iscsi_handle(conn->transport);
2556         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2557         ev->r.conn_login.state = state;
2558         ev->r.conn_login.cid = conn->cid;
2559         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2560         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2561
2562         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2563                               state);
2564 }
2565 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2566
2567 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2568                            enum iscsi_host_event_code code, uint32_t data_size,
2569                            uint8_t *data)
2570 {
2571         struct nlmsghdr *nlh;
2572         struct sk_buff *skb;
2573         struct iscsi_uevent *ev;
2574         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2575
2576         skb = alloc_skb(len, GFP_NOIO);
2577         if (!skb) {
2578                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2579                        host_no, code);
2580                 return;
2581         }
2582
2583         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2584         ev = nlmsg_data(nlh);
2585         ev->transport_handle = iscsi_handle(transport);
2586         ev->type = ISCSI_KEVENT_HOST_EVENT;
2587         ev->r.host_event.host_no = host_no;
2588         ev->r.host_event.code = code;
2589         ev->r.host_event.data_size = data_size;
2590
2591         if (data_size)
2592                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2593
2594         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2595 }
2596 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2597
2598 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2599                            uint32_t status, uint32_t pid, uint32_t data_size,
2600                            uint8_t *data)
2601 {
2602         struct nlmsghdr *nlh;
2603         struct sk_buff *skb;
2604         struct iscsi_uevent *ev;
2605         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2606
2607         skb = alloc_skb(len, GFP_NOIO);
2608         if (!skb) {
2609                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2610                 return;
2611         }
2612
2613         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2614         ev = nlmsg_data(nlh);
2615         ev->transport_handle = iscsi_handle(transport);
2616         ev->type = ISCSI_KEVENT_PING_COMP;
2617         ev->r.ping_comp.host_no = host_no;
2618         ev->r.ping_comp.status = status;
2619         ev->r.ping_comp.pid = pid;
2620         ev->r.ping_comp.data_size = data_size;
2621         memcpy((char *)ev + sizeof(*ev), data, data_size);
2622
2623         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2624 }
2625 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2626
2627 static int
2628 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2629 {
2630         struct sk_buff  *skb;
2631         struct nlmsghdr *nlh;
2632         int len = nlmsg_total_size(size);
2633
2634         skb = alloc_skb(len, GFP_ATOMIC);
2635         if (!skb) {
2636                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2637                 return -ENOMEM;
2638         }
2639
2640         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2641         memcpy(nlmsg_data(nlh), payload, size);
2642         return iscsi_unicast_skb(skb, portid);
2643 }
2644
2645 static int
2646 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2647 {
2648         struct iscsi_uevent *ev = nlmsg_data(nlh);
2649         struct iscsi_stats *stats;
2650         struct sk_buff *skbstat;
2651         struct iscsi_cls_conn *conn;
2652         struct nlmsghdr *nlhstat;
2653         struct iscsi_uevent *evstat;
2654         struct iscsi_internal *priv;
2655         int len = nlmsg_total_size(sizeof(*ev) +
2656                                    sizeof(struct iscsi_stats) +
2657                                    sizeof(struct iscsi_stats_custom) *
2658                                    ISCSI_STATS_CUSTOM_MAX);
2659         int err = 0;
2660
2661         priv = iscsi_if_transport_lookup(transport);
2662         if (!priv)
2663                 return -EINVAL;
2664
2665         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2666         if (!conn)
2667                 return -EEXIST;
2668
2669         do {
2670                 int actual_size;
2671
2672                 skbstat = alloc_skb(len, GFP_ATOMIC);
2673                 if (!skbstat) {
2674                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2675                                               "deliver stats: OOM\n");
2676                         return -ENOMEM;
2677                 }
2678
2679                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2680                                       (len - sizeof(*nlhstat)), 0);
2681                 evstat = nlmsg_data(nlhstat);
2682                 memset(evstat, 0, sizeof(*evstat));
2683                 evstat->transport_handle = iscsi_handle(conn->transport);
2684                 evstat->type = nlh->nlmsg_type;
2685                 evstat->u.get_stats.cid =
2686                         ev->u.get_stats.cid;
2687                 evstat->u.get_stats.sid =
2688                         ev->u.get_stats.sid;
2689                 stats = (struct iscsi_stats *)
2690                         ((char*)evstat + sizeof(*evstat));
2691                 memset(stats, 0, sizeof(*stats));
2692
2693                 transport->get_stats(conn, stats);
2694                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2695                                                sizeof(struct iscsi_stats) +
2696                                                sizeof(struct iscsi_stats_custom) *
2697                                                stats->custom_length);
2698                 actual_size -= sizeof(*nlhstat);
2699                 actual_size = nlmsg_msg_size(actual_size);
2700                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2701                 nlhstat->nlmsg_len = actual_size;
2702
2703                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2704                                           GFP_ATOMIC);
2705         } while (err < 0 && err != -ECONNREFUSED);
2706
2707         return err;
2708 }
2709
2710 /**
2711  * iscsi_session_event - send session destr. completion event
2712  * @session: iscsi class session
2713  * @event: type of event
2714  */
2715 int iscsi_session_event(struct iscsi_cls_session *session,
2716                         enum iscsi_uevent_e event)
2717 {
2718         struct iscsi_internal *priv;
2719         struct Scsi_Host *shost;
2720         struct iscsi_uevent *ev;
2721         struct sk_buff  *skb;
2722         struct nlmsghdr *nlh;
2723         int rc, len = nlmsg_total_size(sizeof(*ev));
2724
2725         priv = iscsi_if_transport_lookup(session->transport);
2726         if (!priv)
2727                 return -EINVAL;
2728         shost = iscsi_session_to_shost(session);
2729
2730         skb = alloc_skb(len, GFP_KERNEL);
2731         if (!skb) {
2732                 iscsi_cls_session_printk(KERN_ERR, session,
2733                                          "Cannot notify userspace of session "
2734                                          "event %u\n", event);
2735                 return -ENOMEM;
2736         }
2737
2738         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2739         ev = nlmsg_data(nlh);
2740         ev->transport_handle = iscsi_handle(session->transport);
2741
2742         ev->type = event;
2743         switch (event) {
2744         case ISCSI_KEVENT_DESTROY_SESSION:
2745                 ev->r.d_session.host_no = shost->host_no;
2746                 ev->r.d_session.sid = session->sid;
2747                 break;
2748         case ISCSI_KEVENT_CREATE_SESSION:
2749                 ev->r.c_session_ret.host_no = shost->host_no;
2750                 ev->r.c_session_ret.sid = session->sid;
2751                 break;
2752         case ISCSI_KEVENT_UNBIND_SESSION:
2753                 ev->r.unbind_session.host_no = shost->host_no;
2754                 ev->r.unbind_session.sid = session->sid;
2755                 break;
2756         default:
2757                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2758                                          "%u.\n", event);
2759                 kfree_skb(skb);
2760                 return -EINVAL;
2761         }
2762
2763         /*
2764          * this will occur if the daemon is not up, so we just warn
2765          * the user and when the daemon is restarted it will handle it
2766          */
2767         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2768         if (rc == -ESRCH)
2769                 iscsi_cls_session_printk(KERN_ERR, session,
2770                                          "Cannot notify userspace of session "
2771                                          "event %u. Check iscsi daemon\n",
2772                                          event);
2773
2774         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2775                                 event, rc);
2776         return rc;
2777 }
2778 EXPORT_SYMBOL_GPL(iscsi_session_event);
2779
2780 static int
2781 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2782                         struct iscsi_uevent *ev, pid_t pid,
2783                         uint32_t initial_cmdsn, uint16_t cmds_max,
2784                         uint16_t queue_depth)
2785 {
2786         struct iscsi_transport *transport = priv->iscsi_transport;
2787         struct iscsi_cls_session *session;
2788         struct Scsi_Host *shost;
2789
2790         session = transport->create_session(ep, cmds_max, queue_depth,
2791                                             initial_cmdsn);
2792         if (!session)
2793                 return -ENOMEM;
2794
2795         session->creator = pid;
2796         shost = iscsi_session_to_shost(session);
2797         ev->r.c_session_ret.host_no = shost->host_no;
2798         ev->r.c_session_ret.sid = session->sid;
2799         ISCSI_DBG_TRANS_SESSION(session,
2800                                 "Completed creating transport session\n");
2801         return 0;
2802 }
2803
2804 static int
2805 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2806 {
2807         struct iscsi_cls_conn *conn;
2808         struct iscsi_cls_session *session;
2809
2810         session = iscsi_session_lookup(ev->u.c_conn.sid);
2811         if (!session) {
2812                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2813                        ev->u.c_conn.sid);
2814                 return -EINVAL;
2815         }
2816
2817         conn = transport->create_conn(session, ev->u.c_conn.cid);
2818         if (!conn) {
2819                 iscsi_cls_session_printk(KERN_ERR, session,
2820                                          "couldn't create a new connection.");
2821                 return -ENOMEM;
2822         }
2823
2824         ev->r.c_conn_ret.sid = session->sid;
2825         ev->r.c_conn_ret.cid = conn->cid;
2826
2827         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2828         return 0;
2829 }
2830
2831 static int
2832 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2833 {
2834         struct iscsi_cls_conn *conn;
2835         unsigned long flags;
2836
2837         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2838         if (!conn)
2839                 return -EINVAL;
2840
2841         spin_lock_irqsave(&connlock, flags);
2842         if (!list_empty(&conn->conn_list_err)) {
2843                 spin_unlock_irqrestore(&connlock, flags);
2844                 return -EAGAIN;
2845         }
2846         spin_unlock_irqrestore(&connlock, flags);
2847
2848         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2849         if (transport->destroy_conn)
2850                 transport->destroy_conn(conn);
2851
2852         return 0;
2853 }
2854
2855 static int
2856 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2857 {
2858         char *data = (char*)ev + sizeof(*ev);
2859         struct iscsi_cls_conn *conn;
2860         struct iscsi_cls_session *session;
2861         int err = 0, value = 0;
2862
2863         session = iscsi_session_lookup(ev->u.set_param.sid);
2864         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2865         if (!conn || !session)
2866                 return -EINVAL;
2867
2868         switch (ev->u.set_param.param) {
2869         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2870                 sscanf(data, "%d", &value);
2871                 if (!session->recovery_tmo_sysfs_override)
2872                         session->recovery_tmo = value;
2873                 break;
2874         default:
2875                 err = transport->set_param(conn, ev->u.set_param.param,
2876                                            data, ev->u.set_param.len);
2877         }
2878
2879         return err;
2880 }
2881
2882 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2883                                struct iscsi_uevent *ev, int msg_type)
2884 {
2885         struct iscsi_endpoint *ep;
2886         struct sockaddr *dst_addr;
2887         struct Scsi_Host *shost = NULL;
2888         int non_blocking, err = 0;
2889
2890         if (!transport->ep_connect)
2891                 return -EINVAL;
2892
2893         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2894                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2895                 if (!shost) {
2896                         printk(KERN_ERR "ep connect failed. Could not find "
2897                                "host no %u\n",
2898                                ev->u.ep_connect_through_host.host_no);
2899                         return -ENODEV;
2900                 }
2901                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2902         } else
2903                 non_blocking = ev->u.ep_connect.non_blocking;
2904
2905         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2906         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2907         if (IS_ERR(ep)) {
2908                 err = PTR_ERR(ep);
2909                 goto release_host;
2910         }
2911
2912         ev->r.ep_connect_ret.handle = ep->id;
2913 release_host:
2914         if (shost)
2915                 scsi_host_put(shost);
2916         return err;
2917 }
2918
2919 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2920                                   u64 ep_handle)
2921 {
2922         struct iscsi_cls_conn *conn;
2923         struct iscsi_endpoint *ep;
2924
2925         if (!transport->ep_disconnect)
2926                 return -EINVAL;
2927
2928         ep = iscsi_lookup_endpoint(ep_handle);
2929         if (!ep)
2930                 return -EINVAL;
2931         conn = ep->conn;
2932         if (conn) {
2933                 mutex_lock(&conn->ep_mutex);
2934                 conn->ep = NULL;
2935                 mutex_unlock(&conn->ep_mutex);
2936         }
2937
2938         transport->ep_disconnect(ep);
2939         return 0;
2940 }
2941
2942 static int
2943 iscsi_if_transport_ep(struct iscsi_transport *transport,
2944                       struct iscsi_uevent *ev, int msg_type)
2945 {
2946         struct iscsi_endpoint *ep;
2947         int rc = 0;
2948
2949         switch (msg_type) {
2950         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2951         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2952                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
2953                 break;
2954         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2955                 if (!transport->ep_poll)
2956                         return -EINVAL;
2957
2958                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2959                 if (!ep)
2960                         return -EINVAL;
2961
2962                 ev->r.retcode = transport->ep_poll(ep,
2963                                                    ev->u.ep_poll.timeout_ms);
2964                 break;
2965         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2966                 rc = iscsi_if_ep_disconnect(transport,
2967                                             ev->u.ep_disconnect.ep_handle);
2968                 break;
2969         }
2970         return rc;
2971 }
2972
2973 static int
2974 iscsi_tgt_dscvr(struct iscsi_transport *transport,
2975                 struct iscsi_uevent *ev)
2976 {
2977         struct Scsi_Host *shost;
2978         struct sockaddr *dst_addr;
2979         int err;
2980
2981         if (!transport->tgt_dscvr)
2982                 return -EINVAL;
2983
2984         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
2985         if (!shost) {
2986                 printk(KERN_ERR "target discovery could not find host no %u\n",
2987                        ev->u.tgt_dscvr.host_no);
2988                 return -ENODEV;
2989         }
2990
2991
2992         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2993         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
2994                                    ev->u.tgt_dscvr.enable, dst_addr);
2995         scsi_host_put(shost);
2996         return err;
2997 }
2998
2999 static int
3000 iscsi_set_host_param(struct iscsi_transport *transport,
3001                      struct iscsi_uevent *ev)
3002 {
3003         char *data = (char*)ev + sizeof(*ev);
3004         struct Scsi_Host *shost;
3005         int err;
3006
3007         if (!transport->set_host_param)
3008                 return -ENOSYS;
3009
3010         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3011         if (!shost) {
3012                 printk(KERN_ERR "set_host_param could not find host no %u\n",
3013                        ev->u.set_host_param.host_no);
3014                 return -ENODEV;
3015         }
3016
3017         err = transport->set_host_param(shost, ev->u.set_host_param.param,
3018                                         data, ev->u.set_host_param.len);
3019         scsi_host_put(shost);
3020         return err;
3021 }
3022
3023 static int
3024 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3025 {
3026         struct Scsi_Host *shost;
3027         struct iscsi_path *params;
3028         int err;
3029
3030         if (!transport->set_path)
3031                 return -ENOSYS;
3032
3033         shost = scsi_host_lookup(ev->u.set_path.host_no);
3034         if (!shost) {
3035                 printk(KERN_ERR "set path could not find host no %u\n",
3036                        ev->u.set_path.host_no);
3037                 return -ENODEV;
3038         }
3039
3040         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3041         err = transport->set_path(shost, params);
3042
3043         scsi_host_put(shost);
3044         return err;
3045 }
3046
3047 static int iscsi_session_has_conns(int sid)
3048 {
3049         struct iscsi_cls_conn *conn;
3050         unsigned long flags;
3051         int found = 0;
3052
3053         spin_lock_irqsave(&connlock, flags);
3054         list_for_each_entry(conn, &connlist, conn_list) {
3055                 if (iscsi_conn_get_sid(conn) == sid) {
3056                         found = 1;
3057                         break;
3058                 }
3059         }
3060         spin_unlock_irqrestore(&connlock, flags);
3061
3062         return found;
3063 }
3064
3065 static int
3066 iscsi_set_iface_params(struct iscsi_transport *transport,
3067                        struct iscsi_uevent *ev, uint32_t len)
3068 {
3069         char *data = (char *)ev + sizeof(*ev);
3070         struct Scsi_Host *shost;
3071         int err;
3072
3073         if (!transport->set_iface_param)
3074                 return -ENOSYS;
3075
3076         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3077         if (!shost) {
3078                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
3079                        ev->u.set_iface_params.host_no);
3080                 return -ENODEV;
3081         }
3082
3083         err = transport->set_iface_param(shost, data, len);
3084         scsi_host_put(shost);
3085         return err;
3086 }
3087
3088 static int
3089 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3090 {
3091         struct Scsi_Host *shost;
3092         struct sockaddr *dst_addr;
3093         int err;
3094
3095         if (!transport->send_ping)
3096                 return -ENOSYS;
3097
3098         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3099         if (!shost) {
3100                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3101                        ev->u.iscsi_ping.host_no);
3102                 return -ENODEV;
3103         }
3104
3105         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3106         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3107                                    ev->u.iscsi_ping.iface_type,
3108                                    ev->u.iscsi_ping.payload_size,
3109                                    ev->u.iscsi_ping.pid,
3110                                    dst_addr);
3111         scsi_host_put(shost);
3112         return err;
3113 }
3114
3115 static int
3116 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3117 {
3118         struct iscsi_uevent *ev = nlmsg_data(nlh);
3119         struct Scsi_Host *shost = NULL;
3120         struct iscsi_chap_rec *chap_rec;
3121         struct iscsi_internal *priv;
3122         struct sk_buff *skbchap;
3123         struct nlmsghdr *nlhchap;
3124         struct iscsi_uevent *evchap;
3125         uint32_t chap_buf_size;
3126         int len, err = 0;
3127         char *buf;
3128
3129         if (!transport->get_chap)
3130                 return -EINVAL;
3131
3132         priv = iscsi_if_transport_lookup(transport);
3133         if (!priv)
3134                 return -EINVAL;
3135
3136         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3137         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3138
3139         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3140         if (!shost) {
3141                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3142                        __func__, ev->u.get_chap.host_no);
3143                 return -ENODEV;
3144         }
3145
3146         do {
3147                 int actual_size;
3148
3149                 skbchap = alloc_skb(len, GFP_KERNEL);
3150                 if (!skbchap) {
3151                         printk(KERN_ERR "can not deliver chap: OOM\n");
3152                         err = -ENOMEM;
3153                         goto exit_get_chap;
3154                 }
3155
3156                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3157                                       (len - sizeof(*nlhchap)), 0);
3158                 evchap = nlmsg_data(nlhchap);
3159                 memset(evchap, 0, sizeof(*evchap));
3160                 evchap->transport_handle = iscsi_handle(transport);
3161                 evchap->type = nlh->nlmsg_type;
3162                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3163                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3164                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3165                 buf = (char *)evchap + sizeof(*evchap);
3166                 memset(buf, 0, chap_buf_size);
3167
3168                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3169                                     &evchap->u.get_chap.num_entries, buf);
3170
3171                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3172                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3173                 nlhchap->nlmsg_len = actual_size;
3174
3175                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3176                                           GFP_KERNEL);
3177         } while (err < 0 && err != -ECONNREFUSED);
3178
3179 exit_get_chap:
3180         scsi_host_put(shost);
3181         return err;
3182 }
3183
3184 static int iscsi_set_chap(struct iscsi_transport *transport,
3185                           struct iscsi_uevent *ev, uint32_t len)
3186 {
3187         char *data = (char *)ev + sizeof(*ev);
3188         struct Scsi_Host *shost;
3189         int err = 0;
3190
3191         if (!transport->set_chap)
3192                 return -ENOSYS;
3193
3194         shost = scsi_host_lookup(ev->u.set_path.host_no);
3195         if (!shost) {
3196                 pr_err("%s could not find host no %u\n",
3197                        __func__, ev->u.set_path.host_no);
3198                 return -ENODEV;
3199         }
3200
3201         err = transport->set_chap(shost, data, len);
3202         scsi_host_put(shost);
3203         return err;
3204 }
3205
3206 static int iscsi_delete_chap(struct iscsi_transport *transport,
3207                              struct iscsi_uevent *ev)
3208 {
3209         struct Scsi_Host *shost;
3210         int err = 0;
3211
3212         if (!transport->delete_chap)
3213                 return -ENOSYS;
3214
3215         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3216         if (!shost) {
3217                 printk(KERN_ERR "%s could not find host no %u\n",
3218                        __func__, ev->u.delete_chap.host_no);
3219                 return -ENODEV;
3220         }
3221
3222         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3223         scsi_host_put(shost);
3224         return err;
3225 }
3226
3227 static const struct {
3228         enum iscsi_discovery_parent_type value;
3229         char                            *name;
3230 } iscsi_discovery_parent_names[] = {
3231         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3232         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3233         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3234 };
3235
3236 char *iscsi_get_discovery_parent_name(int parent_type)
3237 {
3238         int i;
3239         char *state = "Unknown!";
3240
3241         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3242                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3243                         state = iscsi_discovery_parent_names[i].name;
3244                         break;
3245                 }
3246         }
3247         return state;
3248 }
3249 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3250
3251 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3252                                      struct iscsi_uevent *ev, uint32_t len)
3253 {
3254         char *data = (char *)ev + sizeof(*ev);
3255         struct Scsi_Host *shost;
3256         struct iscsi_bus_flash_session *fnode_sess;
3257         struct iscsi_bus_flash_conn *fnode_conn;
3258         struct device *dev;
3259         uint32_t idx;
3260         int err = 0;
3261
3262         if (!transport->set_flashnode_param) {
3263                 err = -ENOSYS;
3264                 goto exit_set_fnode;
3265         }
3266
3267         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3268         if (!shost) {
3269                 pr_err("%s could not find host no %u\n",
3270                        __func__, ev->u.set_flashnode.host_no);
3271                 err = -ENODEV;
3272                 goto put_host;
3273         }
3274
3275         idx = ev->u.set_flashnode.flashnode_idx;
3276         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3277         if (!fnode_sess) {
3278                 pr_err("%s could not find flashnode %u for host no %u\n",
3279                        __func__, idx, ev->u.set_flashnode.host_no);
3280                 err = -ENODEV;
3281                 goto put_host;
3282         }
3283
3284         dev = iscsi_find_flashnode_conn(fnode_sess);
3285         if (!dev) {
3286                 err = -ENODEV;
3287                 goto put_sess;
3288         }
3289
3290         fnode_conn = iscsi_dev_to_flash_conn(dev);
3291         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3292         put_device(dev);
3293
3294 put_sess:
3295         put_device(&fnode_sess->dev);
3296
3297 put_host:
3298         scsi_host_put(shost);
3299
3300 exit_set_fnode:
3301         return err;
3302 }
3303
3304 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3305                                struct iscsi_uevent *ev, uint32_t len)
3306 {
3307         char *data = (char *)ev + sizeof(*ev);
3308         struct Scsi_Host *shost;
3309         int index;
3310         int err = 0;
3311
3312         if (!transport->new_flashnode) {
3313                 err = -ENOSYS;
3314                 goto exit_new_fnode;
3315         }
3316
3317         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3318         if (!shost) {
3319                 pr_err("%s could not find host no %u\n",
3320                        __func__, ev->u.new_flashnode.host_no);
3321                 err = -ENODEV;
3322                 goto put_host;
3323         }
3324
3325         index = transport->new_flashnode(shost, data, len);
3326
3327         if (index >= 0)
3328                 ev->r.new_flashnode_ret.flashnode_idx = index;
3329         else
3330                 err = -EIO;
3331
3332 put_host:
3333         scsi_host_put(shost);
3334
3335 exit_new_fnode:
3336         return err;
3337 }
3338
3339 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3340                                struct iscsi_uevent *ev)
3341 {
3342         struct Scsi_Host *shost;
3343         struct iscsi_bus_flash_session *fnode_sess;
3344         uint32_t idx;
3345         int err = 0;
3346
3347         if (!transport->del_flashnode) {
3348                 err = -ENOSYS;
3349                 goto exit_del_fnode;
3350         }
3351
3352         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3353         if (!shost) {
3354                 pr_err("%s could not find host no %u\n",
3355                        __func__, ev->u.del_flashnode.host_no);
3356                 err = -ENODEV;
3357                 goto put_host;
3358         }
3359
3360         idx = ev->u.del_flashnode.flashnode_idx;
3361         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3362         if (!fnode_sess) {
3363                 pr_err("%s could not find flashnode %u for host no %u\n",
3364                        __func__, idx, ev->u.del_flashnode.host_no);
3365                 err = -ENODEV;
3366                 goto put_host;
3367         }
3368
3369         err = transport->del_flashnode(fnode_sess);
3370         put_device(&fnode_sess->dev);
3371
3372 put_host:
3373         scsi_host_put(shost);
3374
3375 exit_del_fnode:
3376         return err;
3377 }
3378
3379 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3380                                  struct iscsi_uevent *ev)
3381 {
3382         struct Scsi_Host *shost;
3383         struct iscsi_bus_flash_session *fnode_sess;
3384         struct iscsi_bus_flash_conn *fnode_conn;
3385         struct device *dev;
3386         uint32_t idx;
3387         int err = 0;
3388
3389         if (!transport->login_flashnode) {
3390                 err = -ENOSYS;
3391                 goto exit_login_fnode;
3392         }
3393
3394         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3395         if (!shost) {
3396                 pr_err("%s could not find host no %u\n",
3397                        __func__, ev->u.login_flashnode.host_no);
3398                 err = -ENODEV;
3399                 goto put_host;
3400         }
3401
3402         idx = ev->u.login_flashnode.flashnode_idx;
3403         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3404         if (!fnode_sess) {
3405                 pr_err("%s could not find flashnode %u for host no %u\n",
3406                        __func__, idx, ev->u.login_flashnode.host_no);
3407                 err = -ENODEV;
3408                 goto put_host;
3409         }
3410
3411         dev = iscsi_find_flashnode_conn(fnode_sess);
3412         if (!dev) {
3413                 err = -ENODEV;
3414                 goto put_sess;
3415         }
3416
3417         fnode_conn = iscsi_dev_to_flash_conn(dev);
3418         err = transport->login_flashnode(fnode_sess, fnode_conn);
3419         put_device(dev);
3420
3421 put_sess:
3422         put_device(&fnode_sess->dev);
3423
3424 put_host:
3425         scsi_host_put(shost);
3426
3427 exit_login_fnode:
3428         return err;
3429 }
3430
3431 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3432                                   struct iscsi_uevent *ev)
3433 {
3434         struct Scsi_Host *shost;
3435         struct iscsi_bus_flash_session *fnode_sess;
3436         struct iscsi_bus_flash_conn *fnode_conn;
3437         struct device *dev;
3438         uint32_t idx;
3439         int err = 0;
3440
3441         if (!transport->logout_flashnode) {
3442                 err = -ENOSYS;
3443                 goto exit_logout_fnode;
3444         }
3445
3446         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3447         if (!shost) {
3448                 pr_err("%s could not find host no %u\n",
3449                        __func__, ev->u.logout_flashnode.host_no);
3450                 err = -ENODEV;
3451                 goto put_host;
3452         }
3453
3454         idx = ev->u.logout_flashnode.flashnode_idx;
3455         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3456         if (!fnode_sess) {
3457                 pr_err("%s could not find flashnode %u for host no %u\n",
3458                        __func__, idx, ev->u.logout_flashnode.host_no);
3459                 err = -ENODEV;
3460                 goto put_host;
3461         }
3462
3463         dev = iscsi_find_flashnode_conn(fnode_sess);
3464         if (!dev) {
3465                 err = -ENODEV;
3466                 goto put_sess;
3467         }
3468
3469         fnode_conn = iscsi_dev_to_flash_conn(dev);
3470
3471         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3472         put_device(dev);
3473
3474 put_sess:
3475         put_device(&fnode_sess->dev);
3476
3477 put_host:
3478         scsi_host_put(shost);
3479
3480 exit_logout_fnode:
3481         return err;
3482 }
3483
3484 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3485                                       struct iscsi_uevent *ev)
3486 {
3487         struct Scsi_Host *shost;
3488         struct iscsi_cls_session *session;
3489         int err = 0;
3490
3491         if (!transport->logout_flashnode_sid) {
3492                 err = -ENOSYS;
3493                 goto exit_logout_sid;
3494         }
3495
3496         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3497         if (!shost) {
3498                 pr_err("%s could not find host no %u\n",
3499                        __func__, ev->u.logout_flashnode.host_no);
3500                 err = -ENODEV;
3501                 goto put_host;
3502         }
3503
3504         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3505         if (!session) {
3506                 pr_err("%s could not find session id %u\n",
3507                        __func__, ev->u.logout_flashnode_sid.sid);
3508                 err = -EINVAL;
3509                 goto put_host;
3510         }
3511
3512         err = transport->logout_flashnode_sid(session);
3513
3514 put_host:
3515         scsi_host_put(shost);
3516
3517 exit_logout_sid:
3518         return err;
3519 }
3520
3521 static int
3522 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3523 {
3524         struct iscsi_uevent *ev = nlmsg_data(nlh);
3525         struct Scsi_Host *shost = NULL;
3526         struct iscsi_internal *priv;
3527         struct sk_buff *skbhost_stats;
3528         struct nlmsghdr *nlhhost_stats;
3529         struct iscsi_uevent *evhost_stats;
3530         int host_stats_size = 0;
3531         int len, err = 0;
3532         char *buf;
3533
3534         if (!transport->get_host_stats)
3535                 return -ENOSYS;
3536
3537         priv = iscsi_if_transport_lookup(transport);
3538         if (!priv)
3539                 return -EINVAL;
3540
3541         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3542         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3543
3544         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3545         if (!shost) {
3546                 pr_err("%s: failed. Could not find host no %u\n",
3547                        __func__, ev->u.get_host_stats.host_no);
3548                 return -ENODEV;
3549         }
3550
3551         do {
3552                 int actual_size;
3553
3554                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3555                 if (!skbhost_stats) {
3556                         pr_err("cannot deliver host stats: OOM\n");
3557                         err = -ENOMEM;
3558                         goto exit_host_stats;
3559                 }
3560
3561                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3562                                       (len - sizeof(*nlhhost_stats)), 0);
3563                 evhost_stats = nlmsg_data(nlhhost_stats);
3564                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3565                 evhost_stats->transport_handle = iscsi_handle(transport);
3566                 evhost_stats->type = nlh->nlmsg_type;
3567                 evhost_stats->u.get_host_stats.host_no =
3568                                         ev->u.get_host_stats.host_no;
3569                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3570                 memset(buf, 0, host_stats_size);
3571
3572                 err = transport->get_host_stats(shost, buf, host_stats_size);
3573                 if (err) {
3574                         kfree_skb(skbhost_stats);
3575                         goto exit_host_stats;
3576                 }
3577
3578                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3579                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3580                 nlhhost_stats->nlmsg_len = actual_size;
3581
3582                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3583                                           GFP_KERNEL);
3584         } while (err < 0 && err != -ECONNREFUSED);
3585
3586 exit_host_stats:
3587         scsi_host_put(shost);
3588         return err;
3589 }
3590
3591
3592 static int
3593 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3594 {
3595         int err = 0;
3596         u32 portid;
3597         struct iscsi_uevent *ev = nlmsg_data(nlh);
3598         struct iscsi_transport *transport = NULL;
3599         struct iscsi_internal *priv;
3600         struct iscsi_cls_session *session;
3601         struct iscsi_cls_conn *conn;
3602         struct iscsi_endpoint *ep = NULL;
3603
3604         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3605                 *group = ISCSI_NL_GRP_UIP;
3606         else
3607                 *group = ISCSI_NL_GRP_ISCSID;
3608
3609         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3610         if (!priv)
3611                 return -EINVAL;
3612         transport = priv->iscsi_transport;
3613
3614         if (!try_module_get(transport->owner))
3615                 return -EINVAL;
3616
3617         portid = NETLINK_CB(skb).portid;
3618
3619         switch (nlh->nlmsg_type) {
3620         case ISCSI_UEVENT_CREATE_SESSION:
3621                 err = iscsi_if_create_session(priv, ep, ev,
3622                                               portid,
3623                                               ev->u.c_session.initial_cmdsn,
3624                                               ev->u.c_session.cmds_max,
3625                                               ev->u.c_session.queue_depth);
3626                 break;
3627         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3628                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3629                 if (!ep) {
3630                         err = -EINVAL;
3631                         break;
3632                 }
3633
3634                 err = iscsi_if_create_session(priv, ep, ev,
3635                                         portid,
3636                                         ev->u.c_bound_session.initial_cmdsn,
3637                                         ev->u.c_bound_session.cmds_max,
3638                                         ev->u.c_bound_session.queue_depth);
3639                 break;
3640         case ISCSI_UEVENT_DESTROY_SESSION:
3641                 session = iscsi_session_lookup(ev->u.d_session.sid);
3642                 if (!session)
3643                         err = -EINVAL;
3644                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3645                         err = -EBUSY;
3646                 else
3647                         transport->destroy_session(session);
3648                 break;
3649         case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3650                 session = iscsi_session_lookup(ev->u.d_session.sid);
3651                 if (!session)
3652                         err = -EINVAL;
3653                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3654                         err = -EBUSY;
3655                 else {
3656                         unsigned long flags;
3657
3658                         /* Prevent this session from being found again */
3659                         spin_lock_irqsave(&sesslock, flags);
3660                         list_move(&session->sess_list, &sessdestroylist);
3661                         spin_unlock_irqrestore(&sesslock, flags);
3662
3663                         queue_work(iscsi_destroy_workq, &session->destroy_work);
3664                 }
3665                 break;
3666         case ISCSI_UEVENT_UNBIND_SESSION:
3667                 session = iscsi_session_lookup(ev->u.d_session.sid);
3668                 if (session)
3669                         scsi_queue_work(iscsi_session_to_shost(session),
3670                                         &session->unbind_work);
3671                 else
3672                         err = -EINVAL;
3673                 break;
3674         case ISCSI_UEVENT_CREATE_CONN:
3675                 err = iscsi_if_create_conn(transport, ev);
3676                 break;
3677         case ISCSI_UEVENT_DESTROY_CONN:
3678                 err = iscsi_if_destroy_conn(transport, ev);
3679                 break;
3680         case ISCSI_UEVENT_BIND_CONN:
3681                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3682                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3683
3684                 if (conn && conn->ep)
3685                         iscsi_if_ep_disconnect(transport, conn->ep->id);
3686
3687                 if (!session || !conn) {
3688                         err = -EINVAL;
3689                         break;
3690                 }
3691
3692                 ev->r.retcode = transport->bind_conn(session, conn,
3693                                                 ev->u.b_conn.transport_eph,
3694                                                 ev->u.b_conn.is_leading);
3695                 if (ev->r.retcode || !transport->ep_connect)
3696                         break;
3697
3698                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3699                 if (ep) {
3700                         ep->conn = conn;
3701
3702                         mutex_lock(&conn->ep_mutex);
3703                         conn->ep = ep;
3704                         mutex_unlock(&conn->ep_mutex);
3705                 } else
3706                         iscsi_cls_conn_printk(KERN_ERR, conn,
3707                                               "Could not set ep conn "
3708                                               "binding\n");
3709                 break;
3710         case ISCSI_UEVENT_SET_PARAM:
3711                 err = iscsi_set_param(transport, ev);
3712                 break;
3713         case ISCSI_UEVENT_START_CONN:
3714                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3715                 if (conn) {
3716                         ev->r.retcode = transport->start_conn(conn);
3717                         if (!ev->r.retcode)
3718                                 conn->state = ISCSI_CONN_UP;
3719                 }
3720                 else
3721                         err = -EINVAL;
3722                 break;
3723         case ISCSI_UEVENT_STOP_CONN:
3724                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3725                 if (conn)
3726                         transport->stop_conn(conn, ev->u.stop_conn.flag);
3727                 else
3728                         err = -EINVAL;
3729                 break;
3730         case ISCSI_UEVENT_SEND_PDU:
3731                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3732                 if (conn)
3733                         ev->r.retcode = transport->send_pdu(conn,
3734                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3735                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3736                                 ev->u.send_pdu.data_size);
3737                 else
3738                         err = -EINVAL;
3739                 break;
3740         case ISCSI_UEVENT_GET_STATS:
3741                 err = iscsi_if_get_stats(transport, nlh);
3742                 break;
3743         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3744         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3745         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3746         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3747                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3748                 break;
3749         case ISCSI_UEVENT_TGT_DSCVR:
3750                 err = iscsi_tgt_dscvr(transport, ev);
3751                 break;
3752         case ISCSI_UEVENT_SET_HOST_PARAM:
3753                 err = iscsi_set_host_param(transport, ev);
3754                 break;
3755         case ISCSI_UEVENT_PATH_UPDATE:
3756                 err = iscsi_set_path(transport, ev);
3757                 break;
3758         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3759                 err = iscsi_set_iface_params(transport, ev,
3760                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3761                 break;
3762         case ISCSI_UEVENT_PING:
3763                 err = iscsi_send_ping(transport, ev);
3764                 break;
3765         case ISCSI_UEVENT_GET_CHAP:
3766                 err = iscsi_get_chap(transport, nlh);
3767                 break;
3768         case ISCSI_UEVENT_DELETE_CHAP:
3769                 err = iscsi_delete_chap(transport, ev);
3770                 break;
3771         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3772                 err = iscsi_set_flashnode_param(transport, ev,
3773                                                 nlmsg_attrlen(nlh,
3774                                                               sizeof(*ev)));
3775                 break;
3776         case ISCSI_UEVENT_NEW_FLASHNODE:
3777                 err = iscsi_new_flashnode(transport, ev,
3778                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3779                 break;
3780         case ISCSI_UEVENT_DEL_FLASHNODE:
3781                 err = iscsi_del_flashnode(transport, ev);
3782                 break;
3783         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3784                 err = iscsi_login_flashnode(transport, ev);
3785                 break;
3786         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3787                 err = iscsi_logout_flashnode(transport, ev);
3788                 break;
3789         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3790                 err = iscsi_logout_flashnode_sid(transport, ev);
3791                 break;
3792         case ISCSI_UEVENT_SET_CHAP:
3793                 err = iscsi_set_chap(transport, ev,
3794                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3795                 break;
3796         case ISCSI_UEVENT_GET_HOST_STATS:
3797                 err = iscsi_get_host_stats(transport, nlh);
3798                 break;
3799         default:
3800                 err = -ENOSYS;
3801                 break;
3802         }
3803
3804         module_put(transport->owner);
3805         return err;
3806 }
3807
3808 /*
3809  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3810  * Malformed skbs with wrong lengths or invalid creds are not processed.
3811  */
3812 static void
3813 iscsi_if_rx(struct sk_buff *skb)
3814 {
3815         u32 portid = NETLINK_CB(skb).portid;
3816
3817         mutex_lock(&rx_queue_mutex);
3818         while (skb->len >= NLMSG_HDRLEN) {
3819                 int err;
3820                 uint32_t rlen;
3821                 struct nlmsghdr *nlh;
3822                 struct iscsi_uevent *ev;
3823                 uint32_t group;
3824                 int retries = ISCSI_SEND_MAX_ALLOWED;
3825
3826                 nlh = nlmsg_hdr(skb);
3827                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3828                     skb->len < nlh->nlmsg_len) {
3829                         break;
3830                 }
3831
3832                 ev = nlmsg_data(nlh);
3833                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3834                 if (rlen > skb->len)
3835                         rlen = skb->len;
3836
3837                 err = iscsi_if_recv_msg(skb, nlh, &group);
3838                 if (err) {
3839                         ev->type = ISCSI_KEVENT_IF_ERROR;
3840                         ev->iferror = err;
3841                 }
3842                 do {
3843                         /*
3844                          * special case for GET_STATS:
3845                          * on success - sending reply and stats from
3846                          * inside of if_recv_msg(),
3847                          * on error - fall through.
3848                          */
3849                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3850                                 break;
3851                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3852                                 break;
3853                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
3854                                                   ev, sizeof(*ev));
3855                         if (err == -EAGAIN && --retries < 0) {
3856                                 printk(KERN_WARNING "Send reply failed, error %d\n", err);
3857                                 break;
3858                         }
3859                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3860                 skb_pull(skb, rlen);
3861         }
3862         mutex_unlock(&rx_queue_mutex);
3863 }
3864
3865 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
3866 struct device_attribute dev_attr_##_prefix##_##_name =  \
3867         __ATTR(_name,_mode,_show,_store)
3868
3869 /*
3870  * iSCSI connection attrs
3871  */
3872 #define iscsi_conn_attr_show(param)                                     \
3873 static ssize_t                                                          \
3874 show_conn_param_##param(struct device *dev,                             \
3875                         struct device_attribute *attr, char *buf)       \
3876 {                                                                       \
3877         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3878         struct iscsi_transport *t = conn->transport;                    \
3879         return t->get_conn_param(conn, param, buf);                     \
3880 }
3881
3882 #define iscsi_conn_attr(field, param)                                   \
3883         iscsi_conn_attr_show(param)                                     \
3884 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
3885                         NULL);
3886
3887 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3888 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3889 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3890 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3891 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3892 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3893 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3894 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3895 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3896 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3897 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3898 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3899 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3900 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3901 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3902 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3903 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3904 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3905 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3906 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3907 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3908 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3909 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3910 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3911 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3912 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3913 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3914 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3915
3916 static const char *const connection_state_names[] = {
3917         [ISCSI_CONN_UP] = "up",
3918         [ISCSI_CONN_DOWN] = "down",
3919         [ISCSI_CONN_FAILED] = "failed"
3920 };
3921
3922 static ssize_t show_conn_state(struct device *dev,
3923                                struct device_attribute *attr, char *buf)
3924 {
3925         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
3926         const char *state = "unknown";
3927
3928         if (conn->state >= 0 &&
3929             conn->state < ARRAY_SIZE(connection_state_names))
3930                 state = connection_state_names[conn->state];
3931
3932         return sprintf(buf, "%s\n", state);
3933 }
3934 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
3935                         NULL);
3936
3937 #define iscsi_conn_ep_attr_show(param)                                  \
3938 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
3939                                           struct device_attribute *attr,\
3940                                           char *buf)                    \
3941 {                                                                       \
3942         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3943         struct iscsi_transport *t = conn->transport;                    \
3944         struct iscsi_endpoint *ep;                                      \
3945         ssize_t rc;                                                     \
3946                                                                         \
3947         /*                                                              \
3948          * Need to make sure ep_disconnect does not free the LLD's      \
3949          * interconnect resources while we are trying to read them.     \
3950          */                                                             \
3951         mutex_lock(&conn->ep_mutex);                                    \
3952         ep = conn->ep;                                                  \
3953         if (!ep && t->ep_connect) {                                     \
3954                 mutex_unlock(&conn->ep_mutex);                          \
3955                 return -ENOTCONN;                                       \
3956         }                                                               \
3957                                                                         \
3958         if (ep)                                                         \
3959                 rc = t->get_ep_param(ep, param, buf);                   \
3960         else                                                            \
3961                 rc = t->get_conn_param(conn, param, buf);               \
3962         mutex_unlock(&conn->ep_mutex);                                  \
3963         return rc;                                                      \
3964 }
3965
3966 #define iscsi_conn_ep_attr(field, param)                                \
3967         iscsi_conn_ep_attr_show(param)                                  \
3968 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
3969                         show_conn_ep_param_##param, NULL);
3970
3971 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
3972 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
3973
3974 static struct attribute *iscsi_conn_attrs[] = {
3975         &dev_attr_conn_max_recv_dlength.attr,
3976         &dev_attr_conn_max_xmit_dlength.attr,
3977         &dev_attr_conn_header_digest.attr,
3978         &dev_attr_conn_data_digest.attr,
3979         &dev_attr_conn_ifmarker.attr,
3980         &dev_attr_conn_ofmarker.attr,
3981         &dev_attr_conn_address.attr,
3982         &dev_attr_conn_port.attr,
3983         &dev_attr_conn_exp_statsn.attr,
3984         &dev_attr_conn_persistent_address.attr,
3985         &dev_attr_conn_persistent_port.attr,
3986         &dev_attr_conn_ping_tmo.attr,
3987         &dev_attr_conn_recv_tmo.attr,
3988         &dev_attr_conn_local_port.attr,
3989         &dev_attr_conn_statsn.attr,
3990         &dev_attr_conn_keepalive_tmo.attr,
3991         &dev_attr_conn_max_segment_size.attr,
3992         &dev_attr_conn_tcp_timestamp_stat.attr,
3993         &dev_attr_conn_tcp_wsf_disable.attr,
3994         &dev_attr_conn_tcp_nagle_disable.attr,
3995         &dev_attr_conn_tcp_timer_scale.attr,
3996         &dev_attr_conn_tcp_timestamp_enable.attr,
3997         &dev_attr_conn_fragment_disable.attr,
3998         &dev_attr_conn_ipv4_tos.attr,
3999         &dev_attr_conn_ipv6_traffic_class.attr,
4000         &dev_attr_conn_ipv6_flow_label.attr,
4001         &dev_attr_conn_is_fw_assigned_ipv6.attr,
4002         &dev_attr_conn_tcp_xmit_wsf.attr,
4003         &dev_attr_conn_tcp_recv_wsf.attr,
4004         &dev_attr_conn_local_ipaddr.attr,
4005         &dev_attr_conn_state.attr,
4006         NULL,
4007 };
4008
4009 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4010                                          struct attribute *attr, int i)
4011 {
4012         struct device *cdev = container_of(kobj, struct device, kobj);
4013         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4014         struct iscsi_transport *t = conn->transport;
4015         int param;
4016
4017         if (attr == &dev_attr_conn_max_recv_dlength.attr)
4018                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4019         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4020                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4021         else if (attr == &dev_attr_conn_header_digest.attr)
4022                 param = ISCSI_PARAM_HDRDGST_EN;
4023         else if (attr == &dev_attr_conn_data_digest.attr)
4024                 param = ISCSI_PARAM_DATADGST_EN;
4025         else if (attr == &dev_attr_conn_ifmarker.attr)
4026                 param = ISCSI_PARAM_IFMARKER_EN;
4027         else if (attr == &dev_attr_conn_ofmarker.attr)
4028                 param = ISCSI_PARAM_OFMARKER_EN;
4029         else if (attr == &dev_attr_conn_address.attr)
4030                 param = ISCSI_PARAM_CONN_ADDRESS;
4031         else if (attr == &dev_attr_conn_port.attr)
4032                 param = ISCSI_PARAM_CONN_PORT;
4033         else if (attr == &dev_attr_conn_exp_statsn.attr)
4034                 param = ISCSI_PARAM_EXP_STATSN;
4035         else if (attr == &dev_attr_conn_persistent_address.attr)
4036                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4037         else if (attr == &dev_attr_conn_persistent_port.attr)
4038                 param = ISCSI_PARAM_PERSISTENT_PORT;
4039         else if (attr == &dev_attr_conn_ping_tmo.attr)
4040                 param = ISCSI_PARAM_PING_TMO;
4041         else if (attr == &dev_attr_conn_recv_tmo.attr)
4042                 param = ISCSI_PARAM_RECV_TMO;
4043         else if (attr == &dev_attr_conn_local_port.attr)
4044                 param = ISCSI_PARAM_LOCAL_PORT;
4045         else if (attr == &dev_attr_conn_statsn.attr)
4046                 param = ISCSI_PARAM_STATSN;
4047         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4048                 param = ISCSI_PARAM_KEEPALIVE_TMO;
4049         else if (attr == &dev_attr_conn_max_segment_size.attr)
4050                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4051         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4052                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4053         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4054                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
4055         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4056                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4057         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4058                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
4059         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4060                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4061         else if (attr == &dev_attr_conn_fragment_disable.attr)
4062                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4063         else if (attr == &dev_attr_conn_ipv4_tos.attr)
4064                 param = ISCSI_PARAM_IPV4_TOS;
4065         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4066                 param = ISCSI_PARAM_IPV6_TC;
4067         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4068                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4069         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4070                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4071         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4072                 param = ISCSI_PARAM_TCP_XMIT_WSF;
4073         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4074                 param = ISCSI_PARAM_TCP_RECV_WSF;
4075         else if (attr == &dev_attr_conn_local_ipaddr.attr)
4076                 param = ISCSI_PARAM_LOCAL_IPADDR;
4077         else if (attr == &dev_attr_conn_state.attr)
4078                 return S_IRUGO;
4079         else {
4080                 WARN_ONCE(1, "Invalid conn attr");
4081                 return 0;
4082         }
4083
4084         return t->attr_is_visible(ISCSI_PARAM, param);
4085 }
4086
4087 static struct attribute_group iscsi_conn_group = {
4088         .attrs = iscsi_conn_attrs,
4089         .is_visible = iscsi_conn_attr_is_visible,
4090 };
4091
4092 /*
4093  * iSCSI session attrs
4094  */
4095 #define iscsi_session_attr_show(param, perm)                            \
4096 static ssize_t                                                          \
4097 show_session_param_##param(struct device *dev,                          \
4098                            struct device_attribute *attr, char *buf)    \
4099 {                                                                       \
4100         struct iscsi_cls_session *session =                             \
4101                 iscsi_dev_to_session(dev->parent);                      \
4102         struct iscsi_transport *t = session->transport;                 \
4103                                                                         \
4104         if (perm && !capable(CAP_SYS_ADMIN))                            \
4105                 return -EACCES;                                         \
4106         return t->get_session_param(session, param, buf);               \
4107 }
4108
4109 #define iscsi_session_attr(field, param, perm)                          \
4110         iscsi_session_attr_show(param, perm)                            \
4111 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4112                         NULL);
4113 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4114 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4115 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4116 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4117 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4118 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4119 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4120 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4121 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4122 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4123 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4124 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4125 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4126 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4127 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4128 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4129 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4130 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4131 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4132 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4133 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4134 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4135 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4136 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4137 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4138 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4139 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4140 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4141 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4142 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4143 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4144 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4145 iscsi_session_attr(discovery_auth_optional,
4146                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4147 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4148 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4149 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4150 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4151 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4152 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4153 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4154
4155 static ssize_t
4156 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4157                         char *buf)
4158 {
4159         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4160         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
4161 }
4162 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4163                         NULL);
4164 static ssize_t
4165 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4166                         char *buf)
4167 {
4168         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4169         return sprintf(buf, "%d\n", session->creator);
4170 }
4171 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4172                         NULL);
4173 static ssize_t
4174 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4175                             char *buf)
4176 {
4177         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4178         return sprintf(buf, "%d\n", session->target_id);
4179 }
4180 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4181                         show_priv_session_target_id, NULL);
4182
4183 #define iscsi_priv_session_attr_show(field, format)                     \
4184 static ssize_t                                                          \
4185 show_priv_session_##field(struct device *dev,                           \
4186                           struct device_attribute *attr, char *buf)     \
4187 {                                                                       \
4188         struct iscsi_cls_session *session =                             \
4189                         iscsi_dev_to_session(dev->parent);              \
4190         if (session->field == -1)                                       \
4191                 return sprintf(buf, "off\n");                           \
4192         return sprintf(buf, format"\n", session->field);                \
4193 }
4194
4195 #define iscsi_priv_session_attr_store(field)                            \
4196 static ssize_t                                                          \
4197 store_priv_session_##field(struct device *dev,                          \
4198                            struct device_attribute *attr,               \
4199                            const char *buf, size_t count)               \
4200 {                                                                       \
4201         int val;                                                        \
4202         char *cp;                                                       \
4203         struct iscsi_cls_session *session =                             \
4204                 iscsi_dev_to_session(dev->parent);                      \
4205         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4206             (session->state == ISCSI_SESSION_FAILED))                   \
4207                 return -EBUSY;                                          \
4208         if (strncmp(buf, "off", 3) == 0) {                              \
4209                 session->field = -1;                                    \
4210                 session->field##_sysfs_override = true;                 \
4211         } else {                                                        \
4212                 val = simple_strtoul(buf, &cp, 0);                      \
4213                 if (*cp != '\0' && *cp != '\n')                         \
4214                         return -EINVAL;                                 \
4215                 session->field = val;                                   \
4216                 session->field##_sysfs_override = true;                 \
4217         }                                                               \
4218         return count;                                                   \
4219 }
4220
4221 #define iscsi_priv_session_rw_attr(field, format)                       \
4222         iscsi_priv_session_attr_show(field, format)                     \
4223         iscsi_priv_session_attr_store(field)                            \
4224 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4225                         show_priv_session_##field,                      \
4226                         store_priv_session_##field)
4227
4228 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4229
4230 static struct attribute *iscsi_session_attrs[] = {
4231         &dev_attr_sess_initial_r2t.attr,
4232         &dev_attr_sess_max_outstanding_r2t.attr,
4233         &dev_attr_sess_immediate_data.attr,
4234         &dev_attr_sess_first_burst_len.attr,
4235         &dev_attr_sess_max_burst_len.attr,
4236         &dev_attr_sess_data_pdu_in_order.attr,
4237         &dev_attr_sess_data_seq_in_order.attr,
4238         &dev_attr_sess_erl.attr,
4239         &dev_attr_sess_targetname.attr,
4240         &dev_attr_sess_tpgt.attr,
4241         &dev_attr_sess_password.attr,
4242         &dev_attr_sess_password_in.attr,
4243         &dev_attr_sess_username.attr,
4244         &dev_attr_sess_username_in.attr,
4245         &dev_attr_sess_fast_abort.attr,
4246         &dev_attr_sess_abort_tmo.attr,
4247         &dev_attr_sess_lu_reset_tmo.attr,
4248         &dev_attr_sess_tgt_reset_tmo.attr,
4249         &dev_attr_sess_ifacename.attr,
4250         &dev_attr_sess_initiatorname.attr,
4251         &dev_attr_sess_targetalias.attr,
4252         &dev_attr_sess_boot_root.attr,
4253         &dev_attr_sess_boot_nic.attr,
4254         &dev_attr_sess_boot_target.attr,
4255         &dev_attr_priv_sess_recovery_tmo.attr,
4256         &dev_attr_priv_sess_state.attr,
4257         &dev_attr_priv_sess_creator.attr,
4258         &dev_attr_sess_chap_out_idx.attr,
4259         &dev_attr_sess_chap_in_idx.attr,
4260         &dev_attr_priv_sess_target_id.attr,
4261         &dev_attr_sess_auto_snd_tgt_disable.attr,
4262         &dev_attr_sess_discovery_session.attr,
4263         &dev_attr_sess_portal_type.attr,
4264         &dev_attr_sess_chap_auth.attr,
4265         &dev_attr_sess_discovery_logout.attr,
4266         &dev_attr_sess_bidi_chap.attr,
4267         &dev_attr_sess_discovery_auth_optional.attr,
4268         &dev_attr_sess_def_time2wait.attr,
4269         &dev_attr_sess_def_time2retain.attr,
4270         &dev_attr_sess_isid.attr,
4271         &dev_attr_sess_tsid.attr,
4272         &dev_attr_sess_def_taskmgmt_tmo.attr,
4273         &dev_attr_sess_discovery_parent_idx.attr,
4274         &dev_attr_sess_discovery_parent_type.attr,
4275         NULL,
4276 };
4277
4278 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4279                                             struct attribute *attr, int i)
4280 {
4281         struct device *cdev = container_of(kobj, struct device, kobj);
4282         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4283         struct iscsi_transport *t = session->transport;
4284         int param;
4285
4286         if (attr == &dev_attr_sess_initial_r2t.attr)
4287                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4288         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4289                 param = ISCSI_PARAM_MAX_R2T;
4290         else if (attr == &dev_attr_sess_immediate_data.attr)
4291                 param = ISCSI_PARAM_IMM_DATA_EN;
4292         else if (attr == &dev_attr_sess_first_burst_len.attr)
4293                 param = ISCSI_PARAM_FIRST_BURST;
4294         else if (attr == &dev_attr_sess_max_burst_len.attr)
4295                 param = ISCSI_PARAM_MAX_BURST;
4296         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4297                 param = ISCSI_PARAM_PDU_INORDER_EN;
4298         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4299                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4300         else if (attr == &dev_attr_sess_erl.attr)
4301                 param = ISCSI_PARAM_ERL;
4302         else if (attr == &dev_attr_sess_targetname.attr)
4303                 param = ISCSI_PARAM_TARGET_NAME;
4304         else if (attr == &dev_attr_sess_tpgt.attr)
4305                 param = ISCSI_PARAM_TPGT;
4306         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4307                 param = ISCSI_PARAM_CHAP_IN_IDX;
4308         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4309                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4310         else if (attr == &dev_attr_sess_password.attr)
4311                 param = ISCSI_PARAM_USERNAME;
4312         else if (attr == &dev_attr_sess_password_in.attr)
4313                 param = ISCSI_PARAM_USERNAME_IN;
4314         else if (attr == &dev_attr_sess_username.attr)
4315                 param = ISCSI_PARAM_PASSWORD;
4316         else if (attr == &dev_attr_sess_username_in.attr)
4317                 param = ISCSI_PARAM_PASSWORD_IN;
4318         else if (attr == &dev_attr_sess_fast_abort.attr)
4319                 param = ISCSI_PARAM_FAST_ABORT;
4320         else if (attr == &dev_attr_sess_abort_tmo.attr)
4321                 param = ISCSI_PARAM_ABORT_TMO;
4322         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4323                 param = ISCSI_PARAM_LU_RESET_TMO;
4324         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4325                 param = ISCSI_PARAM_TGT_RESET_TMO;
4326         else if (attr == &dev_attr_sess_ifacename.attr)
4327                 param = ISCSI_PARAM_IFACE_NAME;
4328         else if (attr == &dev_attr_sess_initiatorname.attr)
4329                 param = ISCSI_PARAM_INITIATOR_NAME;
4330         else if (attr == &dev_attr_sess_targetalias.attr)
4331                 param = ISCSI_PARAM_TARGET_ALIAS;
4332         else if (attr == &dev_attr_sess_boot_root.attr)
4333                 param = ISCSI_PARAM_BOOT_ROOT;
4334         else if (attr == &dev_attr_sess_boot_nic.attr)
4335                 param = ISCSI_PARAM_BOOT_NIC;
4336         else if (attr == &dev_attr_sess_boot_target.attr)
4337                 param = ISCSI_PARAM_BOOT_TARGET;
4338         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4339                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4340         else if (attr == &dev_attr_sess_discovery_session.attr)
4341                 param = ISCSI_PARAM_DISCOVERY_SESS;
4342         else if (attr == &dev_attr_sess_portal_type.attr)
4343                 param = ISCSI_PARAM_PORTAL_TYPE;
4344         else if (attr == &dev_attr_sess_chap_auth.attr)
4345                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4346         else if (attr == &dev_attr_sess_discovery_logout.attr)
4347                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4348         else if (attr == &dev_attr_sess_bidi_chap.attr)
4349                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4350         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4351                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4352         else if (attr == &dev_attr_sess_def_time2wait.attr)
4353                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4354         else if (attr == &dev_attr_sess_def_time2retain.attr)
4355                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4356         else if (attr == &dev_attr_sess_isid.attr)
4357                 param = ISCSI_PARAM_ISID;
4358         else if (attr == &dev_attr_sess_tsid.attr)
4359                 param = ISCSI_PARAM_TSID;
4360         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4361                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4362         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4363                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4364         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4365                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4366         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4367                 return S_IRUGO | S_IWUSR;
4368         else if (attr == &dev_attr_priv_sess_state.attr)
4369                 return S_IRUGO;
4370         else if (attr == &dev_attr_priv_sess_creator.attr)
4371                 return S_IRUGO;
4372         else if (attr == &dev_attr_priv_sess_target_id.attr)
4373                 return S_IRUGO;
4374         else {
4375                 WARN_ONCE(1, "Invalid session attr");
4376                 return 0;
4377         }
4378
4379         return t->attr_is_visible(ISCSI_PARAM, param);
4380 }
4381
4382 static struct attribute_group iscsi_session_group = {
4383         .attrs = iscsi_session_attrs,
4384         .is_visible = iscsi_session_attr_is_visible,
4385 };
4386
4387 /*
4388  * iSCSI host attrs
4389  */
4390 #define iscsi_host_attr_show(param)                                     \
4391 static ssize_t                                                          \
4392 show_host_param_##param(struct device *dev,                             \
4393                         struct device_attribute *attr, char *buf)       \
4394 {                                                                       \
4395         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4396         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4397         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4398 }
4399
4400 #define iscsi_host_attr(field, param)                                   \
4401         iscsi_host_attr_show(param)                                     \
4402 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4403                         NULL);
4404
4405 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4406 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4407 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4408 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4409 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4410 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4411
4412 static struct attribute *iscsi_host_attrs[] = {
4413         &dev_attr_host_netdev.attr,
4414         &dev_attr_host_hwaddress.attr,
4415         &dev_attr_host_ipaddress.attr,
4416         &dev_attr_host_initiatorname.attr,
4417         &dev_attr_host_port_state.attr,
4418         &dev_attr_host_port_speed.attr,
4419         NULL,
4420 };
4421
4422 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4423                                          struct attribute *attr, int i)
4424 {
4425         struct device *cdev = container_of(kobj, struct device, kobj);
4426         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4427         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4428         int param;
4429
4430         if (attr == &dev_attr_host_netdev.attr)
4431                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4432         else if (attr == &dev_attr_host_hwaddress.attr)
4433                 param = ISCSI_HOST_PARAM_HWADDRESS;
4434         else if (attr == &dev_attr_host_ipaddress.attr)
4435                 param = ISCSI_HOST_PARAM_IPADDRESS;
4436         else if (attr == &dev_attr_host_initiatorname.attr)
4437                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4438         else if (attr == &dev_attr_host_port_state.attr)
4439                 param = ISCSI_HOST_PARAM_PORT_STATE;
4440         else if (attr == &dev_attr_host_port_speed.attr)
4441                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4442         else {
4443                 WARN_ONCE(1, "Invalid host attr");
4444                 return 0;
4445         }
4446
4447         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4448 }
4449
4450 static struct attribute_group iscsi_host_group = {
4451         .attrs = iscsi_host_attrs,
4452         .is_visible = iscsi_host_attr_is_visible,
4453 };
4454
4455 /* convert iscsi_port_speed values to ascii string name */
4456 static const struct {
4457         enum iscsi_port_speed   value;
4458         char                    *name;
4459 } iscsi_port_speed_names[] = {
4460         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4461         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4462         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4463         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4464         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4465         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4466         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4467 };
4468
4469 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4470 {
4471         int i;
4472         char *speed = "Unknown!";
4473         struct iscsi_cls_host *ihost = shost->shost_data;
4474         uint32_t port_speed = ihost->port_speed;
4475
4476         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4477                 if (iscsi_port_speed_names[i].value & port_speed) {
4478                         speed = iscsi_port_speed_names[i].name;
4479                         break;
4480                 }
4481         }
4482         return speed;
4483 }
4484 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4485
4486 /* convert iscsi_port_state values to ascii string name */
4487 static const struct {
4488         enum iscsi_port_state   value;
4489         char                    *name;
4490 } iscsi_port_state_names[] = {
4491         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4492         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4493 };
4494
4495 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4496 {
4497         int i;
4498         char *state = "Unknown!";
4499         struct iscsi_cls_host *ihost = shost->shost_data;
4500         uint32_t port_state = ihost->port_state;
4501
4502         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4503                 if (iscsi_port_state_names[i].value & port_state) {
4504                         state = iscsi_port_state_names[i].name;
4505                         break;
4506                 }
4507         }
4508         return state;
4509 }
4510 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4511
4512 static int iscsi_session_match(struct attribute_container *cont,
4513                            struct device *dev)
4514 {
4515         struct iscsi_cls_session *session;
4516         struct Scsi_Host *shost;
4517         struct iscsi_internal *priv;
4518
4519         if (!iscsi_is_session_dev(dev))
4520                 return 0;
4521
4522         session = iscsi_dev_to_session(dev);
4523         shost = iscsi_session_to_shost(session);
4524         if (!shost->transportt)
4525                 return 0;
4526
4527         priv = to_iscsi_internal(shost->transportt);
4528         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4529                 return 0;
4530
4531         return &priv->session_cont.ac == cont;
4532 }
4533
4534 static int iscsi_conn_match(struct attribute_container *cont,
4535                            struct device *dev)
4536 {
4537         struct iscsi_cls_session *session;
4538         struct iscsi_cls_conn *conn;
4539         struct Scsi_Host *shost;
4540         struct iscsi_internal *priv;
4541
4542         if (!iscsi_is_conn_dev(dev))
4543                 return 0;
4544
4545         conn = iscsi_dev_to_conn(dev);
4546         session = iscsi_dev_to_session(conn->dev.parent);
4547         shost = iscsi_session_to_shost(session);
4548
4549         if (!shost->transportt)
4550                 return 0;
4551
4552         priv = to_iscsi_internal(shost->transportt);
4553         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4554                 return 0;
4555
4556         return &priv->conn_cont.ac == cont;
4557 }
4558
4559 static int iscsi_host_match(struct attribute_container *cont,
4560                             struct device *dev)
4561 {
4562         struct Scsi_Host *shost;
4563         struct iscsi_internal *priv;
4564
4565         if (!scsi_is_host_device(dev))
4566                 return 0;
4567
4568         shost = dev_to_shost(dev);
4569         if (!shost->transportt  ||
4570             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4571                 return 0;
4572
4573         priv = to_iscsi_internal(shost->transportt);
4574         return &priv->t.host_attrs.ac == cont;
4575 }
4576
4577 struct scsi_transport_template *
4578 iscsi_register_transport(struct iscsi_transport *tt)
4579 {
4580         struct iscsi_internal *priv;
4581         unsigned long flags;
4582         int err;
4583
4584         BUG_ON(!tt);
4585
4586         priv = iscsi_if_transport_lookup(tt);
4587         if (priv)
4588                 return NULL;
4589
4590         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4591         if (!priv)
4592                 return NULL;
4593         INIT_LIST_HEAD(&priv->list);
4594         priv->iscsi_transport = tt;
4595         priv->t.user_scan = iscsi_user_scan;
4596         priv->t.create_work_queue = 1;
4597
4598         priv->dev.class = &iscsi_transport_class;
4599         dev_set_name(&priv->dev, "%s", tt->name);
4600         err = device_register(&priv->dev);
4601         if (err)
4602                 goto free_priv;
4603
4604         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4605         if (err)
4606                 goto unregister_dev;
4607
4608         /* host parameters */
4609         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4610         priv->t.host_attrs.ac.match = iscsi_host_match;
4611         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4612         priv->t.host_size = sizeof(struct iscsi_cls_host);
4613         transport_container_register(&priv->t.host_attrs);
4614
4615         /* connection parameters */
4616         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4617         priv->conn_cont.ac.match = iscsi_conn_match;
4618         priv->conn_cont.ac.grp = &iscsi_conn_group;
4619         transport_container_register(&priv->conn_cont);
4620
4621         /* session parameters */
4622         priv->session_cont.ac.class = &iscsi_session_class.class;
4623         priv->session_cont.ac.match = iscsi_session_match;
4624         priv->session_cont.ac.grp = &iscsi_session_group;
4625         transport_container_register(&priv->session_cont);
4626
4627         spin_lock_irqsave(&iscsi_transport_lock, flags);
4628         list_add(&priv->list, &iscsi_transports);
4629         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4630
4631         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4632         return &priv->t;
4633
4634 unregister_dev:
4635         device_unregister(&priv->dev);
4636         return NULL;
4637 free_priv:
4638         kfree(priv);
4639         return NULL;
4640 }
4641 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4642
4643 int iscsi_unregister_transport(struct iscsi_transport *tt)
4644 {
4645         struct iscsi_internal *priv;
4646         unsigned long flags;
4647
4648         BUG_ON(!tt);
4649
4650         mutex_lock(&rx_queue_mutex);
4651
4652         priv = iscsi_if_transport_lookup(tt);
4653         BUG_ON (!priv);
4654
4655         spin_lock_irqsave(&iscsi_transport_lock, flags);
4656         list_del(&priv->list);
4657         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4658
4659         transport_container_unregister(&priv->conn_cont);
4660         transport_container_unregister(&priv->session_cont);
4661         transport_container_unregister(&priv->t.host_attrs);
4662
4663         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4664         device_unregister(&priv->dev);
4665         mutex_unlock(&rx_queue_mutex);
4666
4667         return 0;
4668 }
4669 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4670
4671 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4672                      struct device *dev, const char *fmt, ...)
4673 {
4674         struct va_format vaf;
4675         va_list args;
4676
4677         va_start(args, fmt);
4678         vaf.fmt = fmt;
4679         vaf.va = &args;
4680         trace(dev, &vaf);
4681         va_end(args);
4682 }
4683 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4684
4685 static __init int iscsi_transport_init(void)
4686 {
4687         int err;
4688         struct netlink_kernel_cfg cfg = {
4689                 .groups = 1,
4690                 .input  = iscsi_if_rx,
4691         };
4692         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4693                 ISCSI_TRANSPORT_VERSION);
4694
4695         atomic_set(&iscsi_session_nr, 0);
4696
4697         err = class_register(&iscsi_transport_class);
4698         if (err)
4699                 return err;
4700
4701         err = class_register(&iscsi_endpoint_class);
4702         if (err)
4703                 goto unregister_transport_class;
4704
4705         err = class_register(&iscsi_iface_class);
4706         if (err)
4707                 goto unregister_endpoint_class;
4708
4709         err = transport_class_register(&iscsi_host_class);
4710         if (err)
4711                 goto unregister_iface_class;
4712
4713         err = transport_class_register(&iscsi_connection_class);
4714         if (err)
4715                 goto unregister_host_class;
4716
4717         err = transport_class_register(&iscsi_session_class);
4718         if (err)
4719                 goto unregister_conn_class;
4720
4721         err = bus_register(&iscsi_flashnode_bus);
4722         if (err)
4723                 goto unregister_session_class;
4724
4725         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4726         if (!nls) {
4727                 err = -ENOBUFS;
4728                 goto unregister_flashnode_bus;
4729         }
4730
4731         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
4732         if (!iscsi_eh_timer_workq) {
4733                 err = -ENOMEM;
4734                 goto release_nls;
4735         }
4736
4737         iscsi_destroy_workq = create_singlethread_workqueue("iscsi_destroy");
4738         if (!iscsi_destroy_workq) {
4739                 err = -ENOMEM;
4740                 goto destroy_wq;
4741         }
4742
4743         return 0;
4744
4745 destroy_wq:
4746         destroy_workqueue(iscsi_eh_timer_workq);
4747 release_nls:
4748         netlink_kernel_release(nls);
4749 unregister_flashnode_bus:
4750         bus_unregister(&iscsi_flashnode_bus);
4751 unregister_session_class:
4752         transport_class_unregister(&iscsi_session_class);
4753 unregister_conn_class:
4754         transport_class_unregister(&iscsi_connection_class);
4755 unregister_host_class:
4756         transport_class_unregister(&iscsi_host_class);
4757 unregister_iface_class:
4758         class_unregister(&iscsi_iface_class);
4759 unregister_endpoint_class:
4760         class_unregister(&iscsi_endpoint_class);
4761 unregister_transport_class:
4762         class_unregister(&iscsi_transport_class);
4763         return err;
4764 }
4765
4766 static void __exit iscsi_transport_exit(void)
4767 {
4768         destroy_workqueue(iscsi_destroy_workq);
4769         destroy_workqueue(iscsi_eh_timer_workq);
4770         netlink_kernel_release(nls);
4771         bus_unregister(&iscsi_flashnode_bus);
4772         transport_class_unregister(&iscsi_connection_class);
4773         transport_class_unregister(&iscsi_session_class);
4774         transport_class_unregister(&iscsi_host_class);
4775         class_unregister(&iscsi_endpoint_class);
4776         class_unregister(&iscsi_iface_class);
4777         class_unregister(&iscsi_transport_class);
4778 }
4779
4780 module_init(iscsi_transport_init);
4781 module_exit(iscsi_transport_exit);
4782
4783 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4784               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4785               "Alex Aizman <itn780@yahoo.com>");
4786 MODULE_DESCRIPTION("iSCSI Transport Interface");
4787 MODULE_LICENSE("GPL");
4788 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4789 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);