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
 136         if (!capable(CAP_SYS_ADMIN))
 137                 return -EACCES;
 138         return sysfs_emit(buf, "%llu\n",
 139                   (unsigned long long)iscsi_handle(priv->iscsi_transport));
 140 }
 141 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 142
 143 #define show_transport_attr(name, format)                               \
 144 static ssize_t                                                          \
 145 show_transport_##name(struct device *dev,                               \
 146                       struct device_attribute *attr,char *buf)          \
 147 {                                                                       \
 148         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 149         return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
 150 }                                                                       \
 151 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 152
 153 show_transport_attr(caps, "0x%x");
 154
 155 static struct attribute *iscsi_transport_attrs[] = {
 156         &dev_attr_handle.attr,
 157         &dev_attr_caps.attr,
 158         NULL,
 159 };
 160
 161 static struct attribute_group iscsi_transport_group = {
 162         .attrs = iscsi_transport_attrs,
 163 };
 164
 165 /*
 166  * iSCSI endpoint attrs
 167  */
 168 #define iscsi_dev_to_endpoint(_dev) \
 169         container_of(_dev, struct iscsi_endpoint, dev)
 170
 171 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 172 struct device_attribute dev_attr_##_prefix##_##_name =  \
 173         __ATTR(_name,_mode,_show,_store)
 174
 175 static void iscsi_endpoint_release(struct device *dev)
 176 {
 177         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 178         kfree(ep);
 179 }
 180
 181 static struct class iscsi_endpoint_class = {
 182         .name = "iscsi_endpoint",
 183         .dev_release = iscsi_endpoint_release,
 184 };
 185
 186 static ssize_t
 187 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 188 {
 189         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 190         return sysfs_emit(buf, "%llu\n", (unsigned long long) ep->id);
 191 }
 192 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 193
 194 static struct attribute *iscsi_endpoint_attrs[] = {
 195         &dev_attr_ep_handle.attr,
 196         NULL,
 197 };
 198
 199 static struct attribute_group iscsi_endpoint_group = {
 200         .attrs = iscsi_endpoint_attrs,
 201 };
 202
 203 #define ISCSI_MAX_EPID -1
 204
 205 static int iscsi_match_epid(struct device *dev, const void *data)
 206 {
 207         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 208         const uint64_t *epid = data;
 209
 210         return *epid == ep->id;
 211 }
 212
 213 struct iscsi_endpoint *
 214 iscsi_create_endpoint(int dd_size)
 215 {
 216         struct device *dev;
 217         struct iscsi_endpoint *ep;
 218         uint64_t id;
 219         int err;
 220
 221         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 222                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 223                                         iscsi_match_epid);
 224                 if (!dev)
 225                         break;
 226                 else
 227                         put_device(dev);
 228         }
 229         if (id == ISCSI_MAX_EPID) {
 230                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 231                        ISCSI_MAX_EPID - 1);
 232                 return NULL;
 233         }
 234
 235         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 236         if (!ep)
 237                 return NULL;
 238
 239         ep->id = id;
 240         ep->dev.class = &iscsi_endpoint_class;
 241         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 242         err = device_register(&ep->dev);
 243         if (err)
 244                 goto free_ep;
 245
 246         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 247         if (err)
 248                 goto unregister_dev;
 249
 250         if (dd_size)
 251                 ep->dd_data = &ep[1];
 252         return ep;
 253
 254 unregister_dev:
 255         device_unregister(&ep->dev);
 256         return NULL;
 257
 258 free_ep:
 259         kfree(ep);
 260         return NULL;
 261 }
 262 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 263
 264 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 265 {
 266         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 267         device_unregister(&ep->dev);
 268 }
 269 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 270
 271 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 272 {
 273         struct iscsi_endpoint *ep;
 274         struct device *dev;
 275
 276         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 277                                 iscsi_match_epid);
 278         if (!dev)
 279                 return NULL;
 280
 281         ep = iscsi_dev_to_endpoint(dev);
 282         /*
 283          * we can drop this now because the interface will prevent
 284          * removals and lookups from racing.
 285          */
 286         put_device(dev);
 287         return ep;
 288 }
 289 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 290
 291 /*
 292  * Interface to display network param to sysfs
 293  */
 294
 295 static void iscsi_iface_release(struct device *dev)
 296 {
 297         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 298         struct device *parent = iface->dev.parent;
 299
 300         kfree(iface);
 301         put_device(parent);
 302 }
 303
 304
 305 static struct class iscsi_iface_class = {
 306         .name = "iscsi_iface",
 307         .dev_release = iscsi_iface_release,
 308 };
 309
 310 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 311 struct device_attribute dev_attr_##_prefix##_##_name =          \
 312         __ATTR(_name, _mode, _show, _store)
 313
 314 /* iface attrs show */
 315 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 316 static ssize_t                                                          \
 317 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 318                      char *buf)                                         \
 319 {                                                                       \
 320         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 321         struct iscsi_transport *t = iface->transport;                   \
 322         return t->get_iface_param(iface, param_type, param, buf);       \
 323 }                                                                       \
 324
 325 #define iscsi_iface_net_attr(type, name, param)                         \
 326         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 327 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 328
 329 #define iscsi_iface_attr(type, name, param)                             \
 330         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 331 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 332
 333 /* generic read only ipv4 attribute */
 334 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 335 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 336 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 337 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 338 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 339                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 340 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 341                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 342 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 343 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 344 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 345                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 346 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 347                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 348 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 349                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 350 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 351                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 352 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 353                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 354 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 355                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 356 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 357                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 358 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 359                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 360 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 361                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 362 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 363
 364 /* generic read only ipv6 attribute */
 365 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 366 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 367                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 368 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 369 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 370                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 371 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 372                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 373 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 374                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 375 iscsi_iface_net_attr(ipv6_iface, router_state,
 376                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 377 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 378                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 379 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 380 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 381 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 382                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 383 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 384 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 385                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 386 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 387                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 388 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 389                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 390 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 391                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 392 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 393                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 394
 395 /* common read only iface attribute */
 396 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 397 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 398 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 399 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 400 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 401 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 402 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 403 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 404 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 405                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 406 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 407 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 408 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 409 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 410 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 411 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 412
 413 /* common iscsi specific settings attributes */
 414 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 415 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 416 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 417 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 418 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 419 iscsi_iface_attr(iface, data_seq_in_order,
 420                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 421 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 422 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 423 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 424 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 425 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 426 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 427 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 428 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 429 iscsi_iface_attr(iface, discovery_auth_optional,
 430                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 431 iscsi_iface_attr(iface, discovery_logout,
 432                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 433 iscsi_iface_attr(iface, strict_login_comp_en,
 434                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 435 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 436
 437 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 438                                           struct attribute *attr, int i)
 439 {
 440         struct device *dev = container_of(kobj, struct device, kobj);
 441         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 442         struct iscsi_transport *t = iface->transport;
 443         int param;
 444         int param_type;
 445
 446         if (attr == &dev_attr_iface_enabled.attr)
 447                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 448         else if (attr == &dev_attr_iface_vlan_id.attr)
 449                 param = ISCSI_NET_PARAM_VLAN_ID;
 450         else if (attr == &dev_attr_iface_vlan_priority.attr)
 451                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 452         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 453                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 454         else if (attr == &dev_attr_iface_mtu.attr)
 455                 param = ISCSI_NET_PARAM_MTU;
 456         else if (attr == &dev_attr_iface_port.attr)
 457                 param = ISCSI_NET_PARAM_PORT;
 458         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 459                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 460         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 461                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 462         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 463                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 464         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 465                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 466         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 467                 param = ISCSI_NET_PARAM_TCP_WSF;
 468         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 469                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 470         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 471                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 472         else if (attr == &dev_attr_iface_cache_id.attr)
 473                 param = ISCSI_NET_PARAM_CACHE_ID;
 474         else if (attr == &dev_attr_iface_redirect_en.attr)
 475                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 476         else if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 477                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 478         else if (attr == &dev_attr_iface_header_digest.attr)
 479                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 480         else if (attr == &dev_attr_iface_data_digest.attr)
 481                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 482         else if (attr == &dev_attr_iface_immediate_data.attr)
 483                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 484         else if (attr == &dev_attr_iface_initial_r2t.attr)
 485                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 486         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 487                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 488         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 489                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 490         else if (attr == &dev_attr_iface_erl.attr)
 491                 param = ISCSI_IFACE_PARAM_ERL;
 492         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 493                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 494         else if (attr == &dev_attr_iface_first_burst_len.attr)
 495                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 496         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 497                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 498         else if (attr == &dev_attr_iface_max_burst_len.attr)
 499                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 500         else if (attr == &dev_attr_iface_chap_auth.attr)
 501                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 502         else if (attr == &dev_attr_iface_bidi_chap.attr)
 503                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 504         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 505                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 506         else if (attr == &dev_attr_iface_discovery_logout.attr)
 507                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 508         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 509                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 510         else if (attr == &dev_attr_iface_initiator_name.attr)
 511                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 512         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 513                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 514                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 515                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 516                         param = ISCSI_NET_PARAM_IPV4_GW;
 517                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 518                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 519                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 520                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 521                 else if (attr ==
 522                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 523                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 524                 else if (attr ==
 525                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 526                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 527                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 528                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 529                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 530                         param = ISCSI_NET_PARAM_IPV4_TOS;
 531                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 532                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 533                 else if (attr ==
 534                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 535                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 536                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 537                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 538                 else if (attr ==
 539                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 540                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 541                 else if (attr ==
 542                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 543                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 544                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 545                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 546                 else if (attr ==
 547                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 548                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 549                 else if (attr ==
 550                          &dev_attr_ipv4_iface_fragment_disable.attr)
 551                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 552                 else if (attr ==
 553                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 554                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 555                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 556                         param = ISCSI_NET_PARAM_IPV4_TTL;
 557                 else
 558                         return 0;
 559         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 560                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 561                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 562                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 563                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 564                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 565                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 566                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 567                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 568                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 569                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 570                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 571                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 572                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 573                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 574                 else if (attr ==
 575                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 576                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 577                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 578                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 579                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 580                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 581                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 582                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 583                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 584                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 585                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 586                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 587                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 588                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 589                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 590                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 591                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 592                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 593                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 594                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 595                 else
 596                         return 0;
 597         } else {
 598                 WARN_ONCE(1, "Invalid iface attr");
 599                 return 0;
 600         }
 601
 602         switch (param) {
 603         case ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO:
 604         case ISCSI_IFACE_PARAM_HDRDGST_EN:
 605         case ISCSI_IFACE_PARAM_DATADGST_EN:
 606         case ISCSI_IFACE_PARAM_IMM_DATA_EN:
 607         case ISCSI_IFACE_PARAM_INITIAL_R2T_EN:
 608         case ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN:
 609         case ISCSI_IFACE_PARAM_PDU_INORDER_EN:
 610         case ISCSI_IFACE_PARAM_ERL:
 611         case ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH:
 612         case ISCSI_IFACE_PARAM_FIRST_BURST:
 613         case ISCSI_IFACE_PARAM_MAX_R2T:
 614         case ISCSI_IFACE_PARAM_MAX_BURST:
 615         case ISCSI_IFACE_PARAM_CHAP_AUTH_EN:
 616         case ISCSI_IFACE_PARAM_BIDI_CHAP_EN:
 617         case ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL:
 618         case ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN:
 619         case ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN:
 620         case ISCSI_IFACE_PARAM_INITIATOR_NAME:
 621                 param_type = ISCSI_IFACE_PARAM;
 622                 break;
 623         default:
 624                 param_type = ISCSI_NET_PARAM;
 625         }
 626
 627         return t->attr_is_visible(param_type, param);
 628 }
 629
 630 static struct attribute *iscsi_iface_attrs[] = {
 631         &dev_attr_iface_enabled.attr,
 632         &dev_attr_iface_vlan_id.attr,
 633         &dev_attr_iface_vlan_priority.attr,
 634         &dev_attr_iface_vlan_enabled.attr,
 635         &dev_attr_ipv4_iface_ipaddress.attr,
 636         &dev_attr_ipv4_iface_gateway.attr,
 637         &dev_attr_ipv4_iface_subnet.attr,
 638         &dev_attr_ipv4_iface_bootproto.attr,
 639         &dev_attr_ipv6_iface_ipaddress.attr,
 640         &dev_attr_ipv6_iface_link_local_addr.attr,
 641         &dev_attr_ipv6_iface_router_addr.attr,
 642         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 643         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 644         &dev_attr_iface_mtu.attr,
 645         &dev_attr_iface_port.attr,
 646         &dev_attr_iface_ipaddress_state.attr,
 647         &dev_attr_iface_delayed_ack_en.attr,
 648         &dev_attr_iface_tcp_nagle_disable.attr,
 649         &dev_attr_iface_tcp_wsf_disable.attr,
 650         &dev_attr_iface_tcp_wsf.attr,
 651         &dev_attr_iface_tcp_timer_scale.attr,
 652         &dev_attr_iface_tcp_timestamp_en.attr,
 653         &dev_attr_iface_cache_id.attr,
 654         &dev_attr_iface_redirect_en.attr,
 655         &dev_attr_iface_def_taskmgmt_tmo.attr,
 656         &dev_attr_iface_header_digest.attr,
 657         &dev_attr_iface_data_digest.attr,
 658         &dev_attr_iface_immediate_data.attr,
 659         &dev_attr_iface_initial_r2t.attr,
 660         &dev_attr_iface_data_seq_in_order.attr,
 661         &dev_attr_iface_data_pdu_in_order.attr,
 662         &dev_attr_iface_erl.attr,
 663         &dev_attr_iface_max_recv_dlength.attr,
 664         &dev_attr_iface_first_burst_len.attr,
 665         &dev_attr_iface_max_outstanding_r2t.attr,
 666         &dev_attr_iface_max_burst_len.attr,
 667         &dev_attr_iface_chap_auth.attr,
 668         &dev_attr_iface_bidi_chap.attr,
 669         &dev_attr_iface_discovery_auth_optional.attr,
 670         &dev_attr_iface_discovery_logout.attr,
 671         &dev_attr_iface_strict_login_comp_en.attr,
 672         &dev_attr_iface_initiator_name.attr,
 673         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 674         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 675         &dev_attr_ipv4_iface_tos_en.attr,
 676         &dev_attr_ipv4_iface_tos.attr,
 677         &dev_attr_ipv4_iface_grat_arp_en.attr,
 678         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 679         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 680         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 681         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 682         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 683         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 684         &dev_attr_ipv4_iface_fragment_disable.attr,
 685         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 686         &dev_attr_ipv4_iface_ttl.attr,
 687         &dev_attr_ipv6_iface_link_local_state.attr,
 688         &dev_attr_ipv6_iface_router_state.attr,
 689         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 690         &dev_attr_ipv6_iface_mld_en.attr,
 691         &dev_attr_ipv6_iface_flow_label.attr,
 692         &dev_attr_ipv6_iface_traffic_class.attr,
 693         &dev_attr_ipv6_iface_hop_limit.attr,
 694         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 695         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 696         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 697         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 698         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 699         NULL,
 700 };
 701
 702 static struct attribute_group iscsi_iface_group = {
 703         .attrs = iscsi_iface_attrs,
 704         .is_visible = iscsi_iface_attr_is_visible,
 705 };
 706
 707 /* convert iscsi_ipaddress_state values to ascii string name */
 708 static const struct {
 709         enum iscsi_ipaddress_state      value;
 710         char                            *name;
 711 } iscsi_ipaddress_state_names[] = {
 712         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 713         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 714         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 715         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 716         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 717         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 718         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 719 };
 720
 721 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 722 {
 723         int i;
 724         char *state = NULL;
 725
 726         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 727                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 728                         state = iscsi_ipaddress_state_names[i].name;
 729                         break;
 730                 }
 731         }
 732         return state;
 733 }
 734 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 735
 736 /* convert iscsi_router_state values to ascii string name */
 737 static const struct {
 738         enum iscsi_router_state value;
 739         char                    *name;
 740 } iscsi_router_state_names[] = {
 741         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 742         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 743         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 744         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 745 };
 746
 747 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 748 {
 749         int i;
 750         char *state = NULL;
 751
 752         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 753                 if (iscsi_router_state_names[i].value == router_state) {
 754                         state = iscsi_router_state_names[i].name;
 755                         break;
 756                 }
 757         }
 758         return state;
 759 }
 760 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 761
 762 struct iscsi_iface *
 763 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 764                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 765 {
 766         struct iscsi_iface *iface;
 767         int err;
 768
 769         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 770         if (!iface)
 771                 return NULL;
 772
 773         iface->transport = transport;
 774         iface->iface_type = iface_type;
 775         iface->iface_num = iface_num;
 776         iface->dev.release = iscsi_iface_release;
 777         iface->dev.class = &iscsi_iface_class;
 778         /* parent reference released in iscsi_iface_release */
 779         iface->dev.parent = get_device(&shost->shost_gendev);
 780         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 781                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 782                              iface_num);
 783         else
 784                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 785                              iface_num);
 786
 787         err = device_register(&iface->dev);
 788         if (err)
 789                 goto free_iface;
 790
 791         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 792         if (err)
 793                 goto unreg_iface;
 794
 795         if (dd_size)
 796                 iface->dd_data = &iface[1];
 797         return iface;
 798
 799 unreg_iface:
 800         device_unregister(&iface->dev);
 801         return NULL;
 802
 803 free_iface:
 804         put_device(iface->dev.parent);
 805         kfree(iface);
 806         return NULL;
 807 }
 808 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 809
 810 void iscsi_destroy_iface(struct iscsi_iface *iface)
 811 {
 812         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 813         device_unregister(&iface->dev);
 814 }
 815 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 816
 817 /*
 818  * Interface to display flash node params to sysfs
 819  */
 820
 821 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 822 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 823         __ATTR(_name, _mode, _show, _store)
 824
 825 /* flash node session attrs show */
 826 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 827 static ssize_t                                                          \
 828 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 829                      char *buf)                                         \
 830 {                                                                       \
 831         struct iscsi_bus_flash_session *fnode_sess =                    \
 832                                         iscsi_dev_to_flash_session(dev);\
 833         struct iscsi_transport *t = fnode_sess->transport;              \
 834         return t->get_flashnode_param(fnode_sess, param, buf);          \
 835 }                                                                       \
 836
 837
 838 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 839         iscsi_flashnode_sess_attr_show(type, name, param)               \
 840 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 841                             show_##type##_##name, NULL);
 842
 843 /* Flash node session attributes */
 844
 845 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 846                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 847 iscsi_flashnode_sess_attr(fnode, discovery_session,
 848                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 849 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 850 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 851 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 852 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 853 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 854                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 855 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 856                           ISCSI_FLASHNODE_PDU_INORDER);
 857 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 858 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 859                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 860 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 861 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 862                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 863 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 864 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 865 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 866 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 867                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 868 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 869 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 870 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 871 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 872 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 873                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 874 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 875 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 876 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 877 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 878                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 879 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 880                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 881 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 882 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 883 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 884 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 885 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 886 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 887 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 888
 889 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 890         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 891         &dev_attr_fnode_discovery_session.attr,
 892         &dev_attr_fnode_portal_type.attr,
 893         &dev_attr_fnode_entry_enable.attr,
 894         &dev_attr_fnode_immediate_data.attr,
 895         &dev_attr_fnode_initial_r2t.attr,
 896         &dev_attr_fnode_data_seq_in_order.attr,
 897         &dev_attr_fnode_data_pdu_in_order.attr,
 898         &dev_attr_fnode_chap_auth.attr,
 899         &dev_attr_fnode_discovery_logout.attr,
 900         &dev_attr_fnode_bidi_chap.attr,
 901         &dev_attr_fnode_discovery_auth_optional.attr,
 902         &dev_attr_fnode_erl.attr,
 903         &dev_attr_fnode_first_burst_len.attr,
 904         &dev_attr_fnode_def_time2wait.attr,
 905         &dev_attr_fnode_def_time2retain.attr,
 906         &dev_attr_fnode_max_outstanding_r2t.attr,
 907         &dev_attr_fnode_isid.attr,
 908         &dev_attr_fnode_tsid.attr,
 909         &dev_attr_fnode_max_burst_len.attr,
 910         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 911         &dev_attr_fnode_targetalias.attr,
 912         &dev_attr_fnode_targetname.attr,
 913         &dev_attr_fnode_tpgt.attr,
 914         &dev_attr_fnode_discovery_parent_idx.attr,
 915         &dev_attr_fnode_discovery_parent_type.attr,
 916         &dev_attr_fnode_chap_in_idx.attr,
 917         &dev_attr_fnode_chap_out_idx.attr,
 918         &dev_attr_fnode_username.attr,
 919         &dev_attr_fnode_username_in.attr,
 920         &dev_attr_fnode_password.attr,
 921         &dev_attr_fnode_password_in.attr,
 922         &dev_attr_fnode_is_boot_target.attr,
 923         NULL,
 924 };
 925
 926 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 927                                                     struct attribute *attr,
 928                                                     int i)
 929 {
 930         struct device *dev = container_of(kobj, struct device, kobj);
 931         struct iscsi_bus_flash_session *fnode_sess =
 932                                                 iscsi_dev_to_flash_session(dev);
 933         struct iscsi_transport *t = fnode_sess->transport;
 934         int param;
 935
 936         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 937                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 938         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 939                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 940         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 941                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 942         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 943                 param = ISCSI_FLASHNODE_ENTRY_EN;
 944         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 945                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 946         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 947                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 948         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 949                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 950         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 951                 param = ISCSI_FLASHNODE_PDU_INORDER;
 952         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 953                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 954         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 955                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 956         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 957                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 958         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 959                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 960         } else if (attr == &dev_attr_fnode_erl.attr) {
 961                 param = ISCSI_FLASHNODE_ERL;
 962         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 963                 param = ISCSI_FLASHNODE_FIRST_BURST;
 964         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 965                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 966         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 967                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 968         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 969                 param = ISCSI_FLASHNODE_MAX_R2T;
 970         } else if (attr == &dev_attr_fnode_isid.attr) {
 971                 param = ISCSI_FLASHNODE_ISID;
 972         } else if (attr == &dev_attr_fnode_tsid.attr) {
 973                 param = ISCSI_FLASHNODE_TSID;
 974         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 975                 param = ISCSI_FLASHNODE_MAX_BURST;
 976         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 977                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 978         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 979                 param = ISCSI_FLASHNODE_ALIAS;
 980         } else if (attr == &dev_attr_fnode_targetname.attr) {
 981                 param = ISCSI_FLASHNODE_NAME;
 982         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 983                 param = ISCSI_FLASHNODE_TPGT;
 984         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 985                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 986         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 987                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 988         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 989                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 990         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 991                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 992         } else if (attr == &dev_attr_fnode_username.attr) {
 993                 param = ISCSI_FLASHNODE_USERNAME;
 994         } else if (attr == &dev_attr_fnode_username_in.attr) {
 995                 param = ISCSI_FLASHNODE_USERNAME_IN;
 996         } else if (attr == &dev_attr_fnode_password.attr) {
 997                 param = ISCSI_FLASHNODE_PASSWORD;
 998         } else if (attr == &dev_attr_fnode_password_in.attr) {
 999                 param = ISCSI_FLASHNODE_PASSWORD_IN;
1000         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
1001                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
1002         } else {
1003                 WARN_ONCE(1, "Invalid flashnode session attr");
1004                 return 0;
1005         }
1006
1007         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1008 }
1009
1010 static struct attribute_group iscsi_flashnode_sess_attr_group = {
1011         .attrs = iscsi_flashnode_sess_attrs,
1012         .is_visible = iscsi_flashnode_sess_attr_is_visible,
1013 };
1014
1015 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
1016         &iscsi_flashnode_sess_attr_group,
1017         NULL,
1018 };
1019
1020 static void iscsi_flashnode_sess_release(struct device *dev)
1021 {
1022         struct iscsi_bus_flash_session *fnode_sess =
1023                                                 iscsi_dev_to_flash_session(dev);
1024
1025         kfree(fnode_sess->targetname);
1026         kfree(fnode_sess->targetalias);
1027         kfree(fnode_sess->portal_type);
1028         kfree(fnode_sess);
1029 }
1030
1031 static const struct device_type iscsi_flashnode_sess_dev_type = {
1032         .name = "iscsi_flashnode_sess_dev_type",
1033         .groups = iscsi_flashnode_sess_attr_groups,
1034         .release = iscsi_flashnode_sess_release,
1035 };
1036
1037 /* flash node connection attrs show */
1038 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1039 static ssize_t                                                          \
1040 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1041                      char *buf)                                         \
1042 {                                                                       \
1043         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1044         struct iscsi_bus_flash_session *fnode_sess =                    \
1045                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1046         struct iscsi_transport *t = fnode_conn->transport;              \
1047         return t->get_flashnode_param(fnode_sess, param, buf);          \
1048 }                                                                       \
1049
1050
1051 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1052         iscsi_flashnode_conn_attr_show(type, name, param)               \
1053 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1054                             show_##type##_##name, NULL);
1055
1056 /* Flash node connection attributes */
1057
1058 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1059                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1060 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1061 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1062 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1063 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1064                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1065 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1066                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1067 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1068                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1069 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1070                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1071 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1072                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1073 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1074                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1075 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1076 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1077 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1078 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1079                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1080 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1081                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1082 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1083 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1084 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1085 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1086                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1087 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1088                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1089 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1090                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1091 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1092                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1093 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1094 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1095 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1096 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1097
1098 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1099         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1100         &dev_attr_fnode_header_digest.attr,
1101         &dev_attr_fnode_data_digest.attr,
1102         &dev_attr_fnode_snack_req.attr,
1103         &dev_attr_fnode_tcp_timestamp_stat.attr,
1104         &dev_attr_fnode_tcp_nagle_disable.attr,
1105         &dev_attr_fnode_tcp_wsf_disable.attr,
1106         &dev_attr_fnode_tcp_timer_scale.attr,
1107         &dev_attr_fnode_tcp_timestamp_enable.attr,
1108         &dev_attr_fnode_fragment_disable.attr,
1109         &dev_attr_fnode_max_recv_dlength.attr,
1110         &dev_attr_fnode_max_xmit_dlength.attr,
1111         &dev_attr_fnode_keepalive_tmo.attr,
1112         &dev_attr_fnode_port.attr,
1113         &dev_attr_fnode_ipaddress.attr,
1114         &dev_attr_fnode_redirect_ipaddr.attr,
1115         &dev_attr_fnode_max_segment_size.attr,
1116         &dev_attr_fnode_local_port.attr,
1117         &dev_attr_fnode_ipv4_tos.attr,
1118         &dev_attr_fnode_ipv6_traffic_class.attr,
1119         &dev_attr_fnode_ipv6_flow_label.attr,
1120         &dev_attr_fnode_link_local_ipv6.attr,
1121         &dev_attr_fnode_tcp_xmit_wsf.attr,
1122         &dev_attr_fnode_tcp_recv_wsf.attr,
1123         &dev_attr_fnode_statsn.attr,
1124         &dev_attr_fnode_exp_statsn.attr,
1125         NULL,
1126 };
1127
1128 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1129                                                     struct attribute *attr,
1130                                                     int i)
1131 {
1132         struct device *dev = container_of(kobj, struct device, kobj);
1133         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1134         struct iscsi_transport *t = fnode_conn->transport;
1135         int param;
1136
1137         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1138                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1139         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1140                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1141         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1142                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1143         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1144                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1145         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1146                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1147         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1148                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1149         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1150                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1151         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1152                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1153         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1154                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1155         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1156                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1157         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1158                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1159         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1160                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1161         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1162                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1163         } else if (attr == &dev_attr_fnode_port.attr) {
1164                 param = ISCSI_FLASHNODE_PORT;
1165         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1166                 param = ISCSI_FLASHNODE_IPADDR;
1167         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1168                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1169         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1170                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1171         } else if (attr == &dev_attr_fnode_local_port.attr) {
1172                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1173         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1174                 param = ISCSI_FLASHNODE_IPV4_TOS;
1175         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1176                 param = ISCSI_FLASHNODE_IPV6_TC;
1177         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1178                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1179         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1180                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1181         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1182                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1183         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1184                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1185         } else if (attr == &dev_attr_fnode_statsn.attr) {
1186                 param = ISCSI_FLASHNODE_STATSN;
1187         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1188                 param = ISCSI_FLASHNODE_EXP_STATSN;
1189         } else {
1190                 WARN_ONCE(1, "Invalid flashnode connection attr");
1191                 return 0;
1192         }
1193
1194         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1195 }
1196
1197 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1198         .attrs = iscsi_flashnode_conn_attrs,
1199         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1200 };
1201
1202 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1203         &iscsi_flashnode_conn_attr_group,
1204         NULL,
1205 };
1206
1207 static void iscsi_flashnode_conn_release(struct device *dev)
1208 {
1209         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1210
1211         kfree(fnode_conn->ipaddress);
1212         kfree(fnode_conn->redirect_ipaddr);
1213         kfree(fnode_conn->link_local_ipv6_addr);
1214         kfree(fnode_conn);
1215 }
1216
1217 static const struct device_type iscsi_flashnode_conn_dev_type = {
1218         .name = "iscsi_flashnode_conn_dev_type",
1219         .groups = iscsi_flashnode_conn_attr_groups,
1220         .release = iscsi_flashnode_conn_release,
1221 };
1222
1223 static struct bus_type iscsi_flashnode_bus;
1224
1225 int iscsi_flashnode_bus_match(struct device *dev,
1226                                      struct device_driver *drv)
1227 {
1228         if (dev->bus == &iscsi_flashnode_bus)
1229                 return 1;
1230         return 0;
1231 }
1232 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1233
1234 static struct bus_type iscsi_flashnode_bus = {
1235         .name = "iscsi_flashnode",
1236         .match = &iscsi_flashnode_bus_match,
1237 };
1238
1239 /**
1240  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1241  * @shost: pointer to host data
1242  * @index: index of flashnode to add in sysfs
1243  * @transport: pointer to transport data
1244  * @dd_size: total size to allocate
1245  *
1246  * Adds a sysfs entry for the flashnode session attributes
1247  *
1248  * Returns:
1249  *  pointer to allocated flashnode sess on success
1250  *  %NULL on failure
1251  */
1252 struct iscsi_bus_flash_session *
1253 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1254                             struct iscsi_transport *transport,
1255                             int dd_size)
1256 {
1257         struct iscsi_bus_flash_session *fnode_sess;
1258         int err;
1259
1260         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1261         if (!fnode_sess)
1262                 return NULL;
1263
1264         fnode_sess->transport = transport;
1265         fnode_sess->target_id = index;
1266         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1267         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1268         fnode_sess->dev.parent = &shost->shost_gendev;
1269         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1270                      shost->host_no, index);
1271
1272         err = device_register(&fnode_sess->dev);
1273         if (err)
1274                 goto free_fnode_sess;
1275
1276         if (dd_size)
1277                 fnode_sess->dd_data = &fnode_sess[1];
1278
1279         return fnode_sess;
1280
1281 free_fnode_sess:
1282         kfree(fnode_sess);
1283         return NULL;
1284 }
1285 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1286
1287 /**
1288  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1289  * @shost: pointer to host data
1290  * @fnode_sess: pointer to the parent flashnode session entry
1291  * @transport: pointer to transport data
1292  * @dd_size: total size to allocate
1293  *
1294  * Adds a sysfs entry for the flashnode connection attributes
1295  *
1296  * Returns:
1297  *  pointer to allocated flashnode conn on success
1298  *  %NULL on failure
1299  */
1300 struct iscsi_bus_flash_conn *
1301 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1302                             struct iscsi_bus_flash_session *fnode_sess,
1303                             struct iscsi_transport *transport,
1304                             int dd_size)
1305 {
1306         struct iscsi_bus_flash_conn *fnode_conn;
1307         int err;
1308
1309         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1310         if (!fnode_conn)
1311                 return NULL;
1312
1313         fnode_conn->transport = transport;
1314         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1315         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1316         fnode_conn->dev.parent = &fnode_sess->dev;
1317         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1318                      shost->host_no, fnode_sess->target_id);
1319
1320         err = device_register(&fnode_conn->dev);
1321         if (err)
1322                 goto free_fnode_conn;
1323
1324         if (dd_size)
1325                 fnode_conn->dd_data = &fnode_conn[1];
1326
1327         return fnode_conn;
1328
1329 free_fnode_conn:
1330         kfree(fnode_conn);
1331         return NULL;
1332 }
1333 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1334
1335 /**
1336  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1337  * @dev: device to verify
1338  * @data: pointer to data containing value to use for verification
1339  *
1340  * Verifies if the passed device is flashnode conn device
1341  *
1342  * Returns:
1343  *  1 on success
1344  *  0 on failure
1345  */
1346 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1347 {
1348         return dev->bus == &iscsi_flashnode_bus;
1349 }
1350
1351 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1352 {
1353         device_unregister(&fnode_conn->dev);
1354         return 0;
1355 }
1356
1357 static int flashnode_match_index(struct device *dev, void *data)
1358 {
1359         struct iscsi_bus_flash_session *fnode_sess = NULL;
1360         int ret = 0;
1361
1362         if (!iscsi_flashnode_bus_match(dev, NULL))
1363                 goto exit_match_index;
1364
1365         fnode_sess = iscsi_dev_to_flash_session(dev);
1366         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1367
1368 exit_match_index:
1369         return ret;
1370 }
1371
1372 /**
1373  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1374  * @shost: pointer to host data
1375  * @idx: index to match
1376  *
1377  * Finds the flashnode session object for the passed index
1378  *
1379  * Returns:
1380  *  pointer to found flashnode session object on success
1381  *  %NULL on failure
1382  */
1383 static struct iscsi_bus_flash_session *
1384 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1385 {
1386         struct iscsi_bus_flash_session *fnode_sess = NULL;
1387         struct device *dev;
1388
1389         dev = device_find_child(&shost->shost_gendev, &idx,
1390                                 flashnode_match_index);
1391         if (dev)
1392                 fnode_sess = iscsi_dev_to_flash_session(dev);
1393
1394         return fnode_sess;
1395 }
1396
1397 /**
1398  * iscsi_find_flashnode_sess - finds flashnode session entry
1399  * @shost: pointer to host data
1400  * @data: pointer to data containing value to use for comparison
1401  * @fn: function pointer that does actual comparison
1402  *
1403  * Finds the flashnode session object comparing the data passed using logic
1404  * defined in passed function pointer
1405  *
1406  * Returns:
1407  *  pointer to found flashnode session device object on success
1408  *  %NULL on failure
1409  */
1410 struct device *
1411 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1412                           int (*fn)(struct device *dev, void *data))
1413 {
1414         return device_find_child(&shost->shost_gendev, data, fn);
1415 }
1416 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1417
1418 /**
1419  * iscsi_find_flashnode_conn - finds flashnode connection entry
1420  * @fnode_sess: pointer to parent flashnode session entry
1421  *
1422  * Finds the flashnode connection object comparing the data passed using logic
1423  * defined in passed function pointer
1424  *
1425  * Returns:
1426  *  pointer to found flashnode connection device object on success
1427  *  %NULL on failure
1428  */
1429 struct device *
1430 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1431 {
1432         return device_find_child(&fnode_sess->dev, NULL,
1433                                  iscsi_is_flashnode_conn_dev);
1434 }
1435 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1436
1437 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1438 {
1439         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1440                 return 0;
1441
1442         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1443 }
1444
1445 /**
1446  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1447  * @fnode_sess: pointer to flashnode session entry to be destroyed
1448  *
1449  * Deletes the flashnode session entry and all children flashnode connection
1450  * entries from sysfs
1451  */
1452 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1453 {
1454         int err;
1455
1456         err = device_for_each_child(&fnode_sess->dev, NULL,
1457                                     iscsi_iter_destroy_flashnode_conn_fn);
1458         if (err)
1459                 pr_err("Could not delete all connections for %s. Error %d.\n",
1460                        fnode_sess->dev.kobj.name, err);
1461
1462         device_unregister(&fnode_sess->dev);
1463 }
1464 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1465
1466 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1467 {
1468         if (!iscsi_flashnode_bus_match(dev, NULL))
1469                 return 0;
1470
1471         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1472         return 0;
1473 }
1474
1475 /**
1476  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1477  * @shost: pointer to host data
1478  *
1479  * Destroys all the flashnode session entries and all corresponding children
1480  * flashnode connection entries from sysfs
1481  */
1482 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1483 {
1484         device_for_each_child(&shost->shost_gendev, NULL,
1485                               iscsi_iter_destroy_flashnode_fn);
1486 }
1487 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1488
1489 /*
1490  * BSG support
1491  */
1492 /**
1493  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1494  * @job: bsg job to be processed
1495  */
1496 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1497 {
1498         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1499         struct iscsi_bsg_request *req = job->request;
1500         struct iscsi_bsg_reply *reply = job->reply;
1501         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1502         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1503         int ret;
1504
1505         /* check if we have the msgcode value at least */
1506         if (job->request_len < sizeof(uint32_t)) {
1507                 ret = -ENOMSG;
1508                 goto fail_host_msg;
1509         }
1510
1511         /* Validate the host command */
1512         switch (req->msgcode) {
1513         case ISCSI_BSG_HST_VENDOR:
1514                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1515                 if ((shost->hostt->vendor_id == 0L) ||
1516                     (req->rqst_data.h_vendor.vendor_id !=
1517                         shost->hostt->vendor_id)) {
1518                         ret = -ESRCH;
1519                         goto fail_host_msg;
1520                 }
1521                 break;
1522         default:
1523                 ret = -EBADR;
1524                 goto fail_host_msg;
1525         }
1526
1527         /* check if we really have all the request data needed */
1528         if (job->request_len < cmdlen) {
1529                 ret = -ENOMSG;
1530                 goto fail_host_msg;
1531         }
1532
1533         ret = i->iscsi_transport->bsg_request(job);
1534         if (!ret)
1535                 return 0;
1536
1537 fail_host_msg:
1538         /* return the errno failure code as the only status */
1539         BUG_ON(job->reply_len < sizeof(uint32_t));
1540         reply->reply_payload_rcv_len = 0;
1541         reply->result = ret;
1542         job->reply_len = sizeof(uint32_t);
1543         bsg_job_done(job, ret, 0);
1544         return 0;
1545 }
1546
1547 /**
1548  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1549  * @shost: shost for iscsi_host
1550  * @ihost: iscsi_cls_host adding the structures to
1551  */
1552 static int
1553 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1554 {
1555         struct device *dev = &shost->shost_gendev;
1556         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1557         struct request_queue *q;
1558         char bsg_name[20];
1559
1560         if (!i->iscsi_transport->bsg_request)
1561                 return -ENOTSUPP;
1562
1563         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1564         q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1565         if (IS_ERR(q)) {
1566                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1567                              "initialize - no request queue\n");
1568                 return PTR_ERR(q);
1569         }
1570         __scsi_init_queue(shost, q);
1571
1572         ihost->bsg_q = q;
1573         return 0;
1574 }
1575
1576 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1577                             struct device *cdev)
1578 {
1579         struct Scsi_Host *shost = dev_to_shost(dev);
1580         struct iscsi_cls_host *ihost = shost->shost_data;
1581
1582         memset(ihost, 0, sizeof(*ihost));
1583         atomic_set(&ihost->nr_scans, 0);
1584         mutex_init(&ihost->mutex);
1585
1586         iscsi_bsg_host_add(shost, ihost);
1587         /* ignore any bsg add error - we just can't do sgio */
1588
1589         return 0;
1590 }
1591
1592 static int iscsi_remove_host(struct transport_container *tc,
1593                              struct device *dev, struct device *cdev)
1594 {
1595         struct Scsi_Host *shost = dev_to_shost(dev);
1596         struct iscsi_cls_host *ihost = shost->shost_data;
1597
1598         bsg_remove_queue(ihost->bsg_q);
1599         return 0;
1600 }
1601
1602 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1603                                "iscsi_host",
1604                                iscsi_setup_host,
1605                                iscsi_remove_host,
1606                                NULL);
1607
1608 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1609                                "iscsi_session",
1610                                NULL,
1611                                NULL,
1612                                NULL);
1613
1614 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1615                                "iscsi_connection",
1616                                NULL,
1617                                NULL,
1618                                NULL);
1619
1620 static struct sock *nls;
1621 static DEFINE_MUTEX(rx_queue_mutex);
1622
1623 /*
1624  * conn_mutex protects the {start,bind,stop,destroy}_conn from racing
1625  * against the kernel stop_connection recovery mechanism
1626  */
1627 static DEFINE_MUTEX(conn_mutex);
1628
1629 static LIST_HEAD(sesslist);
1630 static DEFINE_SPINLOCK(sesslock);
1631 static LIST_HEAD(connlist);
1632 static LIST_HEAD(connlist_err);
1633 static DEFINE_SPINLOCK(connlock);
1634
1635 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1636 {
1637         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1638         return sess->sid;
1639 }
1640
1641 /*
1642  * Returns the matching session to a given sid
1643  */
1644 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1645 {
1646         unsigned long flags;
1647         struct iscsi_cls_session *sess;
1648
1649         spin_lock_irqsave(&sesslock, flags);
1650         list_for_each_entry(sess, &sesslist, sess_list) {
1651                 if (sess->sid == sid) {
1652                         spin_unlock_irqrestore(&sesslock, flags);
1653                         return sess;
1654                 }
1655         }
1656         spin_unlock_irqrestore(&sesslock, flags);
1657         return NULL;
1658 }
1659
1660 /*
1661  * Returns the matching connection to a given sid / cid tuple
1662  */
1663 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1664 {
1665         unsigned long flags;
1666         struct iscsi_cls_conn *conn;
1667
1668         spin_lock_irqsave(&connlock, flags);
1669         list_for_each_entry(conn, &connlist, conn_list) {
1670                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1671                         spin_unlock_irqrestore(&connlock, flags);
1672                         return conn;
1673                 }
1674         }
1675         spin_unlock_irqrestore(&connlock, flags);
1676         return NULL;
1677 }
1678
1679 /*
1680  * The following functions can be used by LLDs that allocate
1681  * their own scsi_hosts or by software iscsi LLDs
1682  */
1683 static struct {
1684         int value;
1685         char *name;
1686 } iscsi_session_state_names[] = {
1687         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1688         { ISCSI_SESSION_FAILED,         "FAILED" },
1689         { ISCSI_SESSION_FREE,           "FREE" },
1690 };
1691
1692 static const char *iscsi_session_state_name(int state)
1693 {
1694         int i;
1695         char *name = NULL;
1696
1697         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1698                 if (iscsi_session_state_names[i].value == state) {
1699                         name = iscsi_session_state_names[i].name;
1700                         break;
1701                 }
1702         }
1703         return name;
1704 }
1705
1706 int iscsi_session_chkready(struct iscsi_cls_session *session)
1707 {
1708         int err;
1709
1710         switch (session->state) {
1711         case ISCSI_SESSION_LOGGED_IN:
1712                 err = 0;
1713                 break;
1714         case ISCSI_SESSION_FAILED:
1715                 err = DID_IMM_RETRY << 16;
1716                 break;
1717         case ISCSI_SESSION_FREE:
1718                 err = DID_TRANSPORT_FAILFAST << 16;
1719                 break;
1720         default:
1721                 err = DID_NO_CONNECT << 16;
1722                 break;
1723         }
1724         return err;
1725 }
1726 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1727
1728 int iscsi_is_session_online(struct iscsi_cls_session *session)
1729 {
1730         unsigned long flags;
1731         int ret = 0;
1732
1733         spin_lock_irqsave(&session->lock, flags);
1734         if (session->state == ISCSI_SESSION_LOGGED_IN)
1735                 ret = 1;
1736         spin_unlock_irqrestore(&session->lock, flags);
1737         return ret;
1738 }
1739 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1740
1741 static void iscsi_session_release(struct device *dev)
1742 {
1743         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1744         struct Scsi_Host *shost;
1745
1746         shost = iscsi_session_to_shost(session);
1747         scsi_host_put(shost);
1748         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1749         kfree(session);
1750 }
1751
1752 int iscsi_is_session_dev(const struct device *dev)
1753 {
1754         return dev->release == iscsi_session_release;
1755 }
1756 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1757
1758 static int iscsi_iter_session_fn(struct device *dev, void *data)
1759 {
1760         void (* fn) (struct iscsi_cls_session *) = data;
1761
1762         if (!iscsi_is_session_dev(dev))
1763                 return 0;
1764         fn(iscsi_dev_to_session(dev));
1765         return 0;
1766 }
1767
1768 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1769                                  void (*fn)(struct iscsi_cls_session *))
1770 {
1771         device_for_each_child(&shost->shost_gendev, fn,
1772                               iscsi_iter_session_fn);
1773 }
1774 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1775
1776 /**
1777  * iscsi_scan_finished - helper to report when running scans are done
1778  * @shost: scsi host
1779  * @time: scan run time
1780  *
1781  * This function can be used by drives like qla4xxx to report to the scsi
1782  * layer when the scans it kicked off at module load time are done.
1783  */
1784 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1785 {
1786         struct iscsi_cls_host *ihost = shost->shost_data;
1787         /*
1788          * qla4xxx will have kicked off some session unblocks before calling
1789          * scsi_scan_host, so just wait for them to complete.
1790          */
1791         return !atomic_read(&ihost->nr_scans);
1792 }
1793 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1794
1795 struct iscsi_scan_data {
1796         unsigned int channel;
1797         unsigned int id;
1798         u64 lun;
1799         enum scsi_scan_mode rescan;
1800 };
1801
1802 static int iscsi_user_scan_session(struct device *dev, void *data)
1803 {
1804         struct iscsi_scan_data *scan_data = data;
1805         struct iscsi_cls_session *session;
1806         struct Scsi_Host *shost;
1807         struct iscsi_cls_host *ihost;
1808         unsigned long flags;
1809         unsigned int id;
1810
1811         if (!iscsi_is_session_dev(dev))
1812                 return 0;
1813
1814         session = iscsi_dev_to_session(dev);
1815
1816         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1817
1818         shost = iscsi_session_to_shost(session);
1819         ihost = shost->shost_data;
1820
1821         mutex_lock(&ihost->mutex);
1822         spin_lock_irqsave(&session->lock, flags);
1823         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1824                 spin_unlock_irqrestore(&session->lock, flags);
1825                 goto user_scan_exit;
1826         }
1827         id = session->target_id;
1828         spin_unlock_irqrestore(&session->lock, flags);
1829
1830         if (id != ISCSI_MAX_TARGET) {
1831                 if ((scan_data->channel == SCAN_WILD_CARD ||
1832                      scan_data->channel == 0) &&
1833                     (scan_data->id == SCAN_WILD_CARD ||
1834                      scan_data->id == id))
1835                         scsi_scan_target(&session->dev, 0, id,
1836                                          scan_data->lun, scan_data->rescan);
1837         }
1838
1839 user_scan_exit:
1840         mutex_unlock(&ihost->mutex);
1841         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1842         return 0;
1843 }
1844
1845 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1846                            uint id, u64 lun)
1847 {
1848         struct iscsi_scan_data scan_data;
1849
1850         scan_data.channel = channel;
1851         scan_data.id = id;
1852         scan_data.lun = lun;
1853         scan_data.rescan = SCSI_SCAN_MANUAL;
1854
1855         return device_for_each_child(&shost->shost_gendev, &scan_data,
1856                                      iscsi_user_scan_session);
1857 }
1858
1859 static void iscsi_scan_session(struct work_struct *work)
1860 {
1861         struct iscsi_cls_session *session =
1862                         container_of(work, struct iscsi_cls_session, scan_work);
1863         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1864         struct iscsi_cls_host *ihost = shost->shost_data;
1865         struct iscsi_scan_data scan_data;
1866
1867         scan_data.channel = 0;
1868         scan_data.id = SCAN_WILD_CARD;
1869         scan_data.lun = SCAN_WILD_CARD;
1870         scan_data.rescan = SCSI_SCAN_RESCAN;
1871
1872         iscsi_user_scan_session(&session->dev, &scan_data);
1873         atomic_dec(&ihost->nr_scans);
1874 }
1875
1876 /**
1877  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1878  * @cmd: scsi cmd passed to scsi eh handler
1879  *
1880  * If the session is down this function will wait for the recovery
1881  * timer to fire or for the session to be logged back in. If the
1882  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1883  * should pass this error value to the scsi eh.
1884  */
1885 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1886 {
1887         struct iscsi_cls_session *session =
1888                         starget_to_session(scsi_target(cmd->device));
1889         unsigned long flags;
1890         int ret = 0;
1891
1892         spin_lock_irqsave(&session->lock, flags);
1893         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1894                 if (session->state == ISCSI_SESSION_FREE) {
1895                         ret = FAST_IO_FAIL;
1896                         break;
1897                 }
1898                 spin_unlock_irqrestore(&session->lock, flags);
1899                 msleep(1000);
1900                 spin_lock_irqsave(&session->lock, flags);
1901         }
1902         spin_unlock_irqrestore(&session->lock, flags);
1903         return ret;
1904 }
1905 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1906
1907 static void session_recovery_timedout(struct work_struct *work)
1908 {
1909         struct iscsi_cls_session *session =
1910                 container_of(work, struct iscsi_cls_session,
1911                              recovery_work.work);
1912         unsigned long flags;
1913
1914         iscsi_cls_session_printk(KERN_INFO, session,
1915                                  "session recovery timed out after %d secs\n",
1916                                  session->recovery_tmo);
1917
1918         spin_lock_irqsave(&session->lock, flags);
1919         switch (session->state) {
1920         case ISCSI_SESSION_FAILED:
1921                 session->state = ISCSI_SESSION_FREE;
1922                 break;
1923         case ISCSI_SESSION_LOGGED_IN:
1924         case ISCSI_SESSION_FREE:
1925                 /* we raced with the unblock's flush */
1926                 spin_unlock_irqrestore(&session->lock, flags);
1927                 return;
1928         }
1929         spin_unlock_irqrestore(&session->lock, flags);
1930
1931         if (session->transport->session_recovery_timedout)
1932                 session->transport->session_recovery_timedout(session);
1933
1934         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1935         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1936         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1937 }
1938
1939 static void __iscsi_unblock_session(struct work_struct *work)
1940 {
1941         struct iscsi_cls_session *session =
1942                         container_of(work, struct iscsi_cls_session,
1943                                      unblock_work);
1944         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1945         struct iscsi_cls_host *ihost = shost->shost_data;
1946         unsigned long flags;
1947
1948         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1949         /*
1950          * The recovery and unblock work get run from the same workqueue,
1951          * so try to cancel it if it was going to run after this unblock.
1952          */
1953         cancel_delayed_work(&session->recovery_work);
1954         spin_lock_irqsave(&session->lock, flags);
1955         session->state = ISCSI_SESSION_LOGGED_IN;
1956         spin_unlock_irqrestore(&session->lock, flags);
1957         /* start IO */
1958         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1959         /*
1960          * Only do kernel scanning if the driver is properly hooked into
1961          * the async scanning code (drivers like iscsi_tcp do login and
1962          * scanning from userspace).
1963          */
1964         if (shost->hostt->scan_finished) {
1965                 if (scsi_queue_work(shost, &session->scan_work))
1966                         atomic_inc(&ihost->nr_scans);
1967         }
1968         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1969 }
1970
1971 /**
1972  * iscsi_unblock_session - set a session as logged in and start IO.
1973  * @session: iscsi session
1974  *
1975  * Mark a session as ready to accept IO.
1976  */
1977 void iscsi_unblock_session(struct iscsi_cls_session *session)
1978 {
1979         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1980         /*
1981          * Blocking the session can be done from any context so we only
1982          * queue the block work. Make sure the unblock work has completed
1983          * because it flushes/cancels the other works and updates the state.
1984          */
1985         flush_work(&session->unblock_work);
1986 }
1987 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1988
1989 static void __iscsi_block_session(struct work_struct *work)
1990 {
1991         struct iscsi_cls_session *session =
1992                         container_of(work, struct iscsi_cls_session,
1993                                      block_work);
1994         unsigned long flags;
1995
1996         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1997         spin_lock_irqsave(&session->lock, flags);
1998         session->state = ISCSI_SESSION_FAILED;
1999         spin_unlock_irqrestore(&session->lock, flags);
2000         scsi_target_block(&session->dev);
2001         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
2002         if (session->recovery_tmo >= 0)
2003                 queue_delayed_work(iscsi_eh_timer_workq,
2004                                    &session->recovery_work,
2005                                    session->recovery_tmo * HZ);
2006 }
2007
2008 void iscsi_block_session(struct iscsi_cls_session *session)
2009 {
2010         queue_work(iscsi_eh_timer_workq, &session->block_work);
2011 }
2012 EXPORT_SYMBOL_GPL(iscsi_block_session);
2013
2014 static void __iscsi_unbind_session(struct work_struct *work)
2015 {
2016         struct iscsi_cls_session *session =
2017                         container_of(work, struct iscsi_cls_session,
2018                                      unbind_work);
2019         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2020         struct iscsi_cls_host *ihost = shost->shost_data;
2021         unsigned long flags;
2022         unsigned int target_id;
2023
2024         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2025
2026         /* Prevent new scans and make sure scanning is not in progress */
2027         mutex_lock(&ihost->mutex);
2028         spin_lock_irqsave(&session->lock, flags);
2029         if (session->target_id == ISCSI_MAX_TARGET) {
2030                 spin_unlock_irqrestore(&session->lock, flags);
2031                 mutex_unlock(&ihost->mutex);
2032                 goto unbind_session_exit;
2033         }
2034
2035         target_id = session->target_id;
2036         session->target_id = ISCSI_MAX_TARGET;
2037         spin_unlock_irqrestore(&session->lock, flags);
2038         mutex_unlock(&ihost->mutex);
2039
2040         scsi_remove_target(&session->dev);
2041
2042         if (session->ida_used)
2043                 ida_simple_remove(&iscsi_sess_ida, target_id);
2044
2045 unbind_session_exit:
2046         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2047         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2048 }
2049
2050 static void __iscsi_destroy_session(struct work_struct *work)
2051 {
2052         struct iscsi_cls_session *session =
2053                 container_of(work, struct iscsi_cls_session, destroy_work);
2054
2055         session->transport->destroy_session(session);
2056 }
2057
2058 struct iscsi_cls_session *
2059 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2060                     int dd_size)
2061 {
2062         struct iscsi_cls_session *session;
2063
2064         session = kzalloc(sizeof(*session) + dd_size,
2065                           GFP_KERNEL);
2066         if (!session)
2067                 return NULL;
2068
2069         session->transport = transport;
2070         session->creator = -1;
2071         session->recovery_tmo = 120;
2072         session->recovery_tmo_sysfs_override = false;
2073         session->state = ISCSI_SESSION_FREE;
2074         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2075         INIT_LIST_HEAD(&session->sess_list);
2076         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2077         INIT_WORK(&session->block_work, __iscsi_block_session);
2078         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2079         INIT_WORK(&session->scan_work, iscsi_scan_session);
2080         INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2081         spin_lock_init(&session->lock);
2082
2083         /* this is released in the dev's release function */
2084         scsi_host_get(shost);
2085         session->dev.parent = &shost->shost_gendev;
2086         session->dev.release = iscsi_session_release;
2087         device_initialize(&session->dev);
2088         if (dd_size)
2089                 session->dd_data = &session[1];
2090
2091         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2092         return session;
2093 }
2094 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2095
2096 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2097 {
2098         unsigned long flags;
2099         int id = 0;
2100         int err;
2101
2102         session->sid = atomic_add_return(1, &iscsi_session_nr);
2103
2104         if (target_id == ISCSI_MAX_TARGET) {
2105                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2106
2107                 if (id < 0) {
2108                         iscsi_cls_session_printk(KERN_ERR, session,
2109                                         "Failure in Target ID Allocation\n");
2110                         return id;
2111                 }
2112                 session->target_id = (unsigned int)id;
2113                 session->ida_used = true;
2114         } else
2115                 session->target_id = target_id;
2116
2117         dev_set_name(&session->dev, "session%u", session->sid);
2118         err = device_add(&session->dev);
2119         if (err) {
2120                 iscsi_cls_session_printk(KERN_ERR, session,
2121                                          "could not register session's dev\n");
2122                 goto release_ida;
2123         }
2124         err = transport_register_device(&session->dev);
2125         if (err) {
2126                 iscsi_cls_session_printk(KERN_ERR, session,
2127                                          "could not register transport's dev\n");
2128                 goto release_dev;
2129         }
2130
2131         spin_lock_irqsave(&sesslock, flags);
2132         list_add(&session->sess_list, &sesslist);
2133         spin_unlock_irqrestore(&sesslock, flags);
2134
2135         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2136         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2137         return 0;
2138
2139 release_dev:
2140         device_del(&session->dev);
2141 release_ida:
2142         if (session->ida_used)
2143                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2144
2145         return err;
2146 }
2147 EXPORT_SYMBOL_GPL(iscsi_add_session);
2148
2149 /**
2150  * iscsi_create_session - create iscsi class session
2151  * @shost: scsi host
2152  * @transport: iscsi transport
2153  * @dd_size: private driver data size
2154  * @target_id: which target
2155  *
2156  * This can be called from a LLD or iscsi_transport.
2157  */
2158 struct iscsi_cls_session *
2159 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2160                      int dd_size, unsigned int target_id)
2161 {
2162         struct iscsi_cls_session *session;
2163
2164         session = iscsi_alloc_session(shost, transport, dd_size);
2165         if (!session)
2166                 return NULL;
2167
2168         if (iscsi_add_session(session, target_id)) {
2169                 iscsi_free_session(session);
2170                 return NULL;
2171         }
2172         return session;
2173 }
2174 EXPORT_SYMBOL_GPL(iscsi_create_session);
2175
2176 static void iscsi_conn_release(struct device *dev)
2177 {
2178         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2179         struct device *parent = conn->dev.parent;
2180
2181         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2182         kfree(conn);
2183         put_device(parent);
2184 }
2185
2186 static int iscsi_is_conn_dev(const struct device *dev)
2187 {
2188         return dev->release == iscsi_conn_release;
2189 }
2190
2191 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2192 {
2193         if (!iscsi_is_conn_dev(dev))
2194                 return 0;
2195         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2196 }
2197
2198 void iscsi_remove_session(struct iscsi_cls_session *session)
2199 {
2200         unsigned long flags;
2201         int err;
2202
2203         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2204
2205         spin_lock_irqsave(&sesslock, flags);
2206         if (!list_empty(&session->sess_list))
2207                 list_del(&session->sess_list);
2208         spin_unlock_irqrestore(&sesslock, flags);
2209
2210         flush_work(&session->block_work);
2211         flush_work(&session->unblock_work);
2212         cancel_delayed_work_sync(&session->recovery_work);
2213         /*
2214          * If we are blocked let commands flow again. The lld or iscsi
2215          * layer should set up the queuecommand to fail commands.
2216          * We assume that LLD will not be calling block/unblock while
2217          * removing the session.
2218          */
2219         spin_lock_irqsave(&session->lock, flags);
2220         session->state = ISCSI_SESSION_FREE;
2221         spin_unlock_irqrestore(&session->lock, flags);
2222
2223         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2224         /* flush running scans then delete devices */
2225         flush_work(&session->scan_work);
2226         /* flush running unbind operations */
2227         flush_work(&session->unbind_work);
2228         __iscsi_unbind_session(&session->unbind_work);
2229
2230         /* hw iscsi may not have removed all connections from session */
2231         err = device_for_each_child(&session->dev, NULL,
2232                                     iscsi_iter_destroy_conn_fn);
2233         if (err)
2234                 iscsi_cls_session_printk(KERN_ERR, session,
2235                                          "Could not delete all connections "
2236                                          "for session. Error %d.\n", err);
2237
2238         transport_unregister_device(&session->dev);
2239
2240         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2241         device_del(&session->dev);
2242 }
2243 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2244
2245 void iscsi_free_session(struct iscsi_cls_session *session)
2246 {
2247         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2248         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2249         put_device(&session->dev);
2250 }
2251 EXPORT_SYMBOL_GPL(iscsi_free_session);
2252
2253 /**
2254  * iscsi_create_conn - create iscsi class connection
2255  * @session: iscsi cls session
2256  * @dd_size: private driver data size
2257  * @cid: connection id
2258  *
2259  * This can be called from a LLD or iscsi_transport. The connection
2260  * is child of the session so cid must be unique for all connections
2261  * on the session.
2262  *
2263  * Since we do not support MCS, cid will normally be zero. In some cases
2264  * for software iscsi we could be trying to preallocate a connection struct
2265  * in which case there could be two connection structs and cid would be
2266  * non-zero.
2267  */
2268 struct iscsi_cls_conn *
2269 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2270 {
2271         struct iscsi_transport *transport = session->transport;
2272         struct iscsi_cls_conn *conn;
2273         unsigned long flags;
2274         int err;
2275
2276         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2277         if (!conn)
2278                 return NULL;
2279         if (dd_size)
2280                 conn->dd_data = &conn[1];
2281
2282         mutex_init(&conn->ep_mutex);
2283         INIT_LIST_HEAD(&conn->conn_list);
2284         INIT_LIST_HEAD(&conn->conn_list_err);
2285         conn->transport = transport;
2286         conn->cid = cid;
2287         conn->state = ISCSI_CONN_DOWN;
2288
2289         /* this is released in the dev's release function */
2290         if (!get_device(&session->dev))
2291                 goto free_conn;
2292
2293         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2294         conn->dev.parent = &session->dev;
2295         conn->dev.release = iscsi_conn_release;
2296         err = device_register(&conn->dev);
2297         if (err) {
2298                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2299                                          "register connection's dev\n");
2300                 goto release_parent_ref;
2301         }
2302         err = transport_register_device(&conn->dev);
2303         if (err) {
2304                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2305                                          "register transport's dev\n");
2306                 goto release_conn_ref;
2307         }
2308
2309         spin_lock_irqsave(&connlock, flags);
2310         list_add(&conn->conn_list, &connlist);
2311         spin_unlock_irqrestore(&connlock, flags);
2312
2313         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2314         return conn;
2315
2316 release_conn_ref:
2317         device_unregister(&conn->dev);
2318         put_device(&session->dev);
2319         return NULL;
2320 release_parent_ref:
2321         put_device(&session->dev);
2322 free_conn:
2323         kfree(conn);
2324         return NULL;
2325 }
2326
2327 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2328
2329 /**
2330  * iscsi_destroy_conn - destroy iscsi class connection
2331  * @conn: iscsi cls session
2332  *
2333  * This can be called from a LLD or iscsi_transport.
2334  */
2335 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2336 {
2337         unsigned long flags;
2338
2339         spin_lock_irqsave(&connlock, flags);
2340         list_del(&conn->conn_list);
2341         list_del(&conn->conn_list_err);
2342         spin_unlock_irqrestore(&connlock, flags);
2343
2344         transport_unregister_device(&conn->dev);
2345         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2346         device_unregister(&conn->dev);
2347         return 0;
2348 }
2349 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2350
2351 /*
2352  * iscsi interface functions
2353  */
2354 static struct iscsi_internal *
2355 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2356 {
2357         struct iscsi_internal *priv;
2358         unsigned long flags;
2359
2360         spin_lock_irqsave(&iscsi_transport_lock, flags);
2361         list_for_each_entry(priv, &iscsi_transports, list) {
2362                 if (tt == priv->iscsi_transport) {
2363                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2364                         return priv;
2365                 }
2366         }
2367         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2368         return NULL;
2369 }
2370
2371 static int
2372 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2373 {
2374         return nlmsg_multicast(nls, skb, 0, group, gfp);
2375 }
2376
2377 static int
2378 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2379 {
2380         return nlmsg_unicast(nls, skb, portid);
2381 }
2382
2383 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2384                    char *data, uint32_t data_size)
2385 {
2386         struct nlmsghdr *nlh;
2387         struct sk_buff *skb;
2388         struct iscsi_uevent *ev;
2389         char *pdu;
2390         struct iscsi_internal *priv;
2391         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2392                                    data_size);
2393
2394         priv = iscsi_if_transport_lookup(conn->transport);
2395         if (!priv)
2396                 return -EINVAL;
2397
2398         skb = alloc_skb(len, GFP_ATOMIC);
2399         if (!skb) {
2400                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2401                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2402                                       "control PDU: OOM\n");
2403                 return -ENOMEM;
2404         }
2405
2406         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2407         ev = nlmsg_data(nlh);
2408         memset(ev, 0, sizeof(*ev));
2409         ev->transport_handle = iscsi_handle(conn->transport);
2410         ev->type = ISCSI_KEVENT_RECV_PDU;
2411         ev->r.recv_req.cid = conn->cid;
2412         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2413         pdu = (char*)ev + sizeof(*ev);
2414         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2415         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2416
2417         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2418 }
2419 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2420
2421 int iscsi_offload_mesg(struct Scsi_Host *shost,
2422                        struct iscsi_transport *transport, uint32_t type,
2423                        char *data, uint16_t data_size)
2424 {
2425         struct nlmsghdr *nlh;
2426         struct sk_buff *skb;
2427         struct iscsi_uevent *ev;
2428         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2429
2430         skb = alloc_skb(len, GFP_ATOMIC);
2431         if (!skb) {
2432                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2433                 return -ENOMEM;
2434         }
2435
2436         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2437         ev = nlmsg_data(nlh);
2438         memset(ev, 0, sizeof(*ev));
2439         ev->type = type;
2440         ev->transport_handle = iscsi_handle(transport);
2441         switch (type) {
2442         case ISCSI_KEVENT_PATH_REQ:
2443                 ev->r.req_path.host_no = shost->host_no;
2444                 break;
2445         case ISCSI_KEVENT_IF_DOWN:
2446                 ev->r.notify_if_down.host_no = shost->host_no;
2447                 break;
2448         }
2449
2450         memcpy((char *)ev + sizeof(*ev), data, data_size);
2451
2452         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2453 }
2454 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2455
2456 /*
2457  * This can be called without the rx_queue_mutex, if invoked by the kernel
2458  * stop work. But, in that case, it is guaranteed not to race with
2459  * iscsi_destroy by conn_mutex.
2460  */
2461 static void iscsi_if_stop_conn(struct iscsi_cls_conn *conn, int flag)
2462 {
2463         /*
2464          * It is important that this path doesn't rely on
2465          * rx_queue_mutex, otherwise, a thread doing allocation on a
2466          * start_session/start_connection could sleep waiting on a
2467          * writeback to a failed iscsi device, that cannot be recovered
2468          * because the lock is held.  If we don't hold it here, the
2469          * kernel stop_conn_work_fn has a chance to stop the broken
2470          * session and resolve the allocation.
2471          *
2472          * Still, the user invoked .stop_conn() needs to be serialized
2473          * with stop_conn_work_fn by a private mutex.  Not pretty, but
2474          * it works.
2475          */
2476         mutex_lock(&conn_mutex);
2477         conn->transport->stop_conn(conn, flag);
2478         conn->state = ISCSI_CONN_DOWN;
2479         mutex_unlock(&conn_mutex);
2480
2481 }
2482
2483 static void stop_conn_work_fn(struct work_struct *work)
2484 {
2485         struct iscsi_cls_conn *conn, *tmp;
2486         unsigned long flags;
2487         LIST_HEAD(recovery_list);
2488
2489         spin_lock_irqsave(&connlock, flags);
2490         if (list_empty(&connlist_err)) {
2491                 spin_unlock_irqrestore(&connlock, flags);
2492                 return;
2493         }
2494         list_splice_init(&connlist_err, &recovery_list);
2495         spin_unlock_irqrestore(&connlock, flags);
2496
2497         list_for_each_entry_safe(conn, tmp, &recovery_list, conn_list_err) {
2498                 uint32_t sid = iscsi_conn_get_sid(conn);
2499                 struct iscsi_cls_session *session;
2500
2501                 session = iscsi_session_lookup(sid);
2502                 if (session) {
2503                         if (system_state != SYSTEM_RUNNING) {
2504                                 session->recovery_tmo = 0;
2505                                 iscsi_if_stop_conn(conn, STOP_CONN_TERM);
2506                         } else {
2507                                 iscsi_if_stop_conn(conn, STOP_CONN_RECOVER);
2508                         }
2509                 }
2510
2511                 list_del_init(&conn->conn_list_err);
2512         }
2513 }
2514
2515 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2516 {
2517         struct nlmsghdr *nlh;
2518         struct sk_buff  *skb;
2519         struct iscsi_uevent *ev;
2520         struct iscsi_internal *priv;
2521         int len = nlmsg_total_size(sizeof(*ev));
2522         unsigned long flags;
2523
2524         spin_lock_irqsave(&connlock, flags);
2525         list_add(&conn->conn_list_err, &connlist_err);
2526         spin_unlock_irqrestore(&connlock, flags);
2527         queue_work(system_unbound_wq, &stop_conn_work);
2528
2529         priv = iscsi_if_transport_lookup(conn->transport);
2530         if (!priv)
2531                 return;
2532
2533         skb = alloc_skb(len, GFP_ATOMIC);
2534         if (!skb) {
2535                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2536                                       "conn error (%d)\n", error);
2537                 return;
2538         }
2539
2540         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2541         ev = nlmsg_data(nlh);
2542         ev->transport_handle = iscsi_handle(conn->transport);
2543         ev->type = ISCSI_KEVENT_CONN_ERROR;
2544         ev->r.connerror.error = error;
2545         ev->r.connerror.cid = conn->cid;
2546         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2547
2548         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2549
2550         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2551                               error);
2552 }
2553 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2554
2555 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2556                             enum iscsi_conn_state state)
2557 {
2558         struct nlmsghdr *nlh;
2559         struct sk_buff  *skb;
2560         struct iscsi_uevent *ev;
2561         struct iscsi_internal *priv;
2562         int len = nlmsg_total_size(sizeof(*ev));
2563
2564         priv = iscsi_if_transport_lookup(conn->transport);
2565         if (!priv)
2566                 return;
2567
2568         skb = alloc_skb(len, GFP_ATOMIC);
2569         if (!skb) {
2570                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2571                                       "conn login (%d)\n", state);
2572                 return;
2573         }
2574
2575         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2576         ev = nlmsg_data(nlh);
2577         ev->transport_handle = iscsi_handle(conn->transport);
2578         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2579         ev->r.conn_login.state = state;
2580         ev->r.conn_login.cid = conn->cid;
2581         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2582         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2583
2584         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2585                               state);
2586 }
2587 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2588
2589 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2590                            enum iscsi_host_event_code code, uint32_t data_size,
2591                            uint8_t *data)
2592 {
2593         struct nlmsghdr *nlh;
2594         struct sk_buff *skb;
2595         struct iscsi_uevent *ev;
2596         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2597
2598         skb = alloc_skb(len, GFP_NOIO);
2599         if (!skb) {
2600                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2601                        host_no, code);
2602                 return;
2603         }
2604
2605         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2606         ev = nlmsg_data(nlh);
2607         ev->transport_handle = iscsi_handle(transport);
2608         ev->type = ISCSI_KEVENT_HOST_EVENT;
2609         ev->r.host_event.host_no = host_no;
2610         ev->r.host_event.code = code;
2611         ev->r.host_event.data_size = data_size;
2612
2613         if (data_size)
2614                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2615
2616         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2617 }
2618 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2619
2620 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2621                            uint32_t status, uint32_t pid, uint32_t data_size,
2622                            uint8_t *data)
2623 {
2624         struct nlmsghdr *nlh;
2625         struct sk_buff *skb;
2626         struct iscsi_uevent *ev;
2627         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2628
2629         skb = alloc_skb(len, GFP_NOIO);
2630         if (!skb) {
2631                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2632                 return;
2633         }
2634
2635         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2636         ev = nlmsg_data(nlh);
2637         ev->transport_handle = iscsi_handle(transport);
2638         ev->type = ISCSI_KEVENT_PING_COMP;
2639         ev->r.ping_comp.host_no = host_no;
2640         ev->r.ping_comp.status = status;
2641         ev->r.ping_comp.pid = pid;
2642         ev->r.ping_comp.data_size = data_size;
2643         memcpy((char *)ev + sizeof(*ev), data, data_size);
2644
2645         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2646 }
2647 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2648
2649 static int
2650 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2651 {
2652         struct sk_buff  *skb;
2653         struct nlmsghdr *nlh;
2654         int len = nlmsg_total_size(size);
2655
2656         skb = alloc_skb(len, GFP_ATOMIC);
2657         if (!skb) {
2658                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2659                 return -ENOMEM;
2660         }
2661
2662         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2663         memcpy(nlmsg_data(nlh), payload, size);
2664         return iscsi_unicast_skb(skb, portid);
2665 }
2666
2667 static int
2668 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2669 {
2670         struct iscsi_uevent *ev = nlmsg_data(nlh);
2671         struct iscsi_stats *stats;
2672         struct sk_buff *skbstat;
2673         struct iscsi_cls_conn *conn;
2674         struct nlmsghdr *nlhstat;
2675         struct iscsi_uevent *evstat;
2676         struct iscsi_internal *priv;
2677         int len = nlmsg_total_size(sizeof(*ev) +
2678                                    sizeof(struct iscsi_stats) +
2679                                    sizeof(struct iscsi_stats_custom) *
2680                                    ISCSI_STATS_CUSTOM_MAX);
2681         int err = 0;
2682
2683         priv = iscsi_if_transport_lookup(transport);
2684         if (!priv)
2685                 return -EINVAL;
2686
2687         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2688         if (!conn)
2689                 return -EEXIST;
2690
2691         do {
2692                 int actual_size;
2693
2694                 skbstat = alloc_skb(len, GFP_ATOMIC);
2695                 if (!skbstat) {
2696                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2697                                               "deliver stats: OOM\n");
2698                         return -ENOMEM;
2699                 }
2700
2701                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2702                                       (len - sizeof(*nlhstat)), 0);
2703                 evstat = nlmsg_data(nlhstat);
2704                 memset(evstat, 0, sizeof(*evstat));
2705                 evstat->transport_handle = iscsi_handle(conn->transport);
2706                 evstat->type = nlh->nlmsg_type;
2707                 evstat->u.get_stats.cid =
2708                         ev->u.get_stats.cid;
2709                 evstat->u.get_stats.sid =
2710                         ev->u.get_stats.sid;
2711                 stats = (struct iscsi_stats *)
2712                         ((char*)evstat + sizeof(*evstat));
2713                 memset(stats, 0, sizeof(*stats));
2714
2715                 transport->get_stats(conn, stats);
2716                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2717                                                sizeof(struct iscsi_stats) +
2718                                                sizeof(struct iscsi_stats_custom) *
2719                                                stats->custom_length);
2720                 actual_size -= sizeof(*nlhstat);
2721                 actual_size = nlmsg_msg_size(actual_size);
2722                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2723                 nlhstat->nlmsg_len = actual_size;
2724
2725                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2726                                           GFP_ATOMIC);
2727         } while (err < 0 && err != -ECONNREFUSED);
2728
2729         return err;
2730 }
2731
2732 /**
2733  * iscsi_session_event - send session destr. completion event
2734  * @session: iscsi class session
2735  * @event: type of event
2736  */
2737 int iscsi_session_event(struct iscsi_cls_session *session,
2738                         enum iscsi_uevent_e event)
2739 {
2740         struct iscsi_internal *priv;
2741         struct Scsi_Host *shost;
2742         struct iscsi_uevent *ev;
2743         struct sk_buff  *skb;
2744         struct nlmsghdr *nlh;
2745         int rc, len = nlmsg_total_size(sizeof(*ev));
2746
2747         priv = iscsi_if_transport_lookup(session->transport);
2748         if (!priv)
2749                 return -EINVAL;
2750         shost = iscsi_session_to_shost(session);
2751
2752         skb = alloc_skb(len, GFP_KERNEL);
2753         if (!skb) {
2754                 iscsi_cls_session_printk(KERN_ERR, session,
2755                                          "Cannot notify userspace of session "
2756                                          "event %u\n", event);
2757                 return -ENOMEM;
2758         }
2759
2760         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2761         ev = nlmsg_data(nlh);
2762         ev->transport_handle = iscsi_handle(session->transport);
2763
2764         ev->type = event;
2765         switch (event) {
2766         case ISCSI_KEVENT_DESTROY_SESSION:
2767                 ev->r.d_session.host_no = shost->host_no;
2768                 ev->r.d_session.sid = session->sid;
2769                 break;
2770         case ISCSI_KEVENT_CREATE_SESSION:
2771                 ev->r.c_session_ret.host_no = shost->host_no;
2772                 ev->r.c_session_ret.sid = session->sid;
2773                 break;
2774         case ISCSI_KEVENT_UNBIND_SESSION:
2775                 ev->r.unbind_session.host_no = shost->host_no;
2776                 ev->r.unbind_session.sid = session->sid;
2777                 break;
2778         default:
2779                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2780                                          "%u.\n", event);
2781                 kfree_skb(skb);
2782                 return -EINVAL;
2783         }
2784
2785         /*
2786          * this will occur if the daemon is not up, so we just warn
2787          * the user and when the daemon is restarted it will handle it
2788          */
2789         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2790         if (rc == -ESRCH)
2791                 iscsi_cls_session_printk(KERN_ERR, session,
2792                                          "Cannot notify userspace of session "
2793                                          "event %u. Check iscsi daemon\n",
2794                                          event);
2795
2796         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2797                                 event, rc);
2798         return rc;
2799 }
2800 EXPORT_SYMBOL_GPL(iscsi_session_event);
2801
2802 static int
2803 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2804                         struct iscsi_uevent *ev, pid_t pid,
2805                         uint32_t initial_cmdsn, uint16_t cmds_max,
2806                         uint16_t queue_depth)
2807 {
2808         struct iscsi_transport *transport = priv->iscsi_transport;
2809         struct iscsi_cls_session *session;
2810         struct Scsi_Host *shost;
2811
2812         session = transport->create_session(ep, cmds_max, queue_depth,
2813                                             initial_cmdsn);
2814         if (!session)
2815                 return -ENOMEM;
2816
2817         session->creator = pid;
2818         shost = iscsi_session_to_shost(session);
2819         ev->r.c_session_ret.host_no = shost->host_no;
2820         ev->r.c_session_ret.sid = session->sid;
2821         ISCSI_DBG_TRANS_SESSION(session,
2822                                 "Completed creating transport session\n");
2823         return 0;
2824 }
2825
2826 static int
2827 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2828 {
2829         struct iscsi_cls_conn *conn;
2830         struct iscsi_cls_session *session;
2831
2832         session = iscsi_session_lookup(ev->u.c_conn.sid);
2833         if (!session) {
2834                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2835                        ev->u.c_conn.sid);
2836                 return -EINVAL;
2837         }
2838
2839         conn = transport->create_conn(session, ev->u.c_conn.cid);
2840         if (!conn) {
2841                 iscsi_cls_session_printk(KERN_ERR, session,
2842                                          "couldn't create a new connection.");
2843                 return -ENOMEM;
2844         }
2845
2846         ev->r.c_conn_ret.sid = session->sid;
2847         ev->r.c_conn_ret.cid = conn->cid;
2848
2849         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2850         return 0;
2851 }
2852
2853 static int
2854 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2855 {
2856         struct iscsi_cls_conn *conn;
2857         unsigned long flags;
2858
2859         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2860         if (!conn)
2861                 return -EINVAL;
2862
2863         spin_lock_irqsave(&connlock, flags);
2864         if (!list_empty(&conn->conn_list_err)) {
2865                 spin_unlock_irqrestore(&connlock, flags);
2866                 return -EAGAIN;
2867         }
2868         spin_unlock_irqrestore(&connlock, flags);
2869
2870         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2871
2872         mutex_lock(&conn_mutex);
2873         if (transport->destroy_conn)
2874                 transport->destroy_conn(conn);
2875         mutex_unlock(&conn_mutex);
2876
2877         return 0;
2878 }
2879
2880 static int
2881 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2882 {
2883         char *data = (char*)ev + sizeof(*ev);
2884         struct iscsi_cls_conn *conn;
2885         struct iscsi_cls_session *session;
2886         int err = 0, value = 0;
2887
2888         if (ev->u.set_param.len > PAGE_SIZE)
2889                 return -EINVAL;
2890
2891         session = iscsi_session_lookup(ev->u.set_param.sid);
2892         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2893         if (!conn || !session)
2894                 return -EINVAL;
2895
2896         switch (ev->u.set_param.param) {
2897         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2898                 sscanf(data, "%d", &value);
2899                 if (!session->recovery_tmo_sysfs_override)
2900                         session->recovery_tmo = value;
2901                 break;
2902         default:
2903                 err = transport->set_param(conn, ev->u.set_param.param,
2904                                            data, ev->u.set_param.len);
2905                 if ((conn->state == ISCSI_CONN_BOUND) ||
2906                         (conn->state == ISCSI_CONN_UP)) {
2907                         err = transport->set_param(conn, ev->u.set_param.param,
2908                                         data, ev->u.set_param.len);
2909                 } else {
2910                         return -ENOTCONN;
2911                 }
2912         }
2913
2914         return err;
2915 }
2916
2917 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2918                                struct iscsi_uevent *ev, int msg_type)
2919 {
2920         struct iscsi_endpoint *ep;
2921         struct sockaddr *dst_addr;
2922         struct Scsi_Host *shost = NULL;
2923         int non_blocking, err = 0;
2924
2925         if (!transport->ep_connect)
2926                 return -EINVAL;
2927
2928         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2929                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2930                 if (!shost) {
2931                         printk(KERN_ERR "ep connect failed. Could not find "
2932                                "host no %u\n",
2933                                ev->u.ep_connect_through_host.host_no);
2934                         return -ENODEV;
2935                 }
2936                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2937         } else
2938                 non_blocking = ev->u.ep_connect.non_blocking;
2939
2940         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2941         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2942         if (IS_ERR(ep)) {
2943                 err = PTR_ERR(ep);
2944                 goto release_host;
2945         }
2946
2947         ev->r.ep_connect_ret.handle = ep->id;
2948 release_host:
2949         if (shost)
2950                 scsi_host_put(shost);
2951         return err;
2952 }
2953
2954 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2955                                   u64 ep_handle)
2956 {
2957         struct iscsi_cls_conn *conn;
2958         struct iscsi_endpoint *ep;
2959
2960         if (!transport->ep_disconnect)
2961                 return -EINVAL;
2962
2963         ep = iscsi_lookup_endpoint(ep_handle);
2964         if (!ep)
2965                 return -EINVAL;
2966         conn = ep->conn;
2967         if (conn) {
2968                 mutex_lock(&conn->ep_mutex);
2969                 conn->ep = NULL;
2970                 mutex_unlock(&conn->ep_mutex);
2971                 conn->state = ISCSI_CONN_DOWN;
2972         }
2973
2974         transport->ep_disconnect(ep);
2975         return 0;
2976 }
2977
2978 static int
2979 iscsi_if_transport_ep(struct iscsi_transport *transport,
2980                       struct iscsi_uevent *ev, int msg_type)
2981 {
2982         struct iscsi_endpoint *ep;
2983         int rc = 0;
2984
2985         switch (msg_type) {
2986         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2987         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2988                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
2989                 break;
2990         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2991                 if (!transport->ep_poll)
2992                         return -EINVAL;
2993
2994                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2995                 if (!ep)
2996                         return -EINVAL;
2997
2998                 ev->r.retcode = transport->ep_poll(ep,
2999                                                    ev->u.ep_poll.timeout_ms);
3000                 break;
3001         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3002                 rc = iscsi_if_ep_disconnect(transport,
3003                                             ev->u.ep_disconnect.ep_handle);
3004                 break;
3005         }
3006         return rc;
3007 }
3008
3009 static int
3010 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3011                 struct iscsi_uevent *ev)
3012 {
3013         struct Scsi_Host *shost;
3014         struct sockaddr *dst_addr;
3015         int err;
3016
3017         if (!transport->tgt_dscvr)
3018                 return -EINVAL;
3019
3020         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3021         if (!shost) {
3022                 printk(KERN_ERR "target discovery could not find host no %u\n",
3023                        ev->u.tgt_dscvr.host_no);
3024                 return -ENODEV;
3025         }
3026
3027
3028         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3029         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3030                                    ev->u.tgt_dscvr.enable, dst_addr);
3031         scsi_host_put(shost);
3032         return err;
3033 }
3034
3035 static int
3036 iscsi_set_host_param(struct iscsi_transport *transport,
3037                      struct iscsi_uevent *ev)
3038 {
3039         char *data = (char*)ev + sizeof(*ev);
3040         struct Scsi_Host *shost;
3041         int err;
3042
3043         if (!transport->set_host_param)
3044                 return -ENOSYS;
3045
3046         if (ev->u.set_host_param.len > PAGE_SIZE)
3047                 return -EINVAL;
3048
3049         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3050         if (!shost) {
3051                 printk(KERN_ERR "set_host_param could not find host no %u\n",
3052                        ev->u.set_host_param.host_no);
3053                 return -ENODEV;
3054         }
3055
3056         err = transport->set_host_param(shost, ev->u.set_host_param.param,
3057                                         data, ev->u.set_host_param.len);
3058         scsi_host_put(shost);
3059         return err;
3060 }
3061
3062 static int
3063 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3064 {
3065         struct Scsi_Host *shost;
3066         struct iscsi_path *params;
3067         int err;
3068
3069         if (!transport->set_path)
3070                 return -ENOSYS;
3071
3072         shost = scsi_host_lookup(ev->u.set_path.host_no);
3073         if (!shost) {
3074                 printk(KERN_ERR "set path could not find host no %u\n",
3075                        ev->u.set_path.host_no);
3076                 return -ENODEV;
3077         }
3078
3079         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3080         err = transport->set_path(shost, params);
3081
3082         scsi_host_put(shost);
3083         return err;
3084 }
3085
3086 static int iscsi_session_has_conns(int sid)
3087 {
3088         struct iscsi_cls_conn *conn;
3089         unsigned long flags;
3090         int found = 0;
3091
3092         spin_lock_irqsave(&connlock, flags);
3093         list_for_each_entry(conn, &connlist, conn_list) {
3094                 if (iscsi_conn_get_sid(conn) == sid) {
3095                         found = 1;
3096                         break;
3097                 }
3098         }
3099         spin_unlock_irqrestore(&connlock, flags);
3100
3101         return found;
3102 }
3103
3104 static int
3105 iscsi_set_iface_params(struct iscsi_transport *transport,
3106                        struct iscsi_uevent *ev, uint32_t len)
3107 {
3108         char *data = (char *)ev + sizeof(*ev);
3109         struct Scsi_Host *shost;
3110         int err;
3111
3112         if (!transport->set_iface_param)
3113                 return -ENOSYS;
3114
3115         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3116         if (!shost) {
3117                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
3118                        ev->u.set_iface_params.host_no);
3119                 return -ENODEV;
3120         }
3121
3122         err = transport->set_iface_param(shost, data, len);
3123         scsi_host_put(shost);
3124         return err;
3125 }
3126
3127 static int
3128 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3129 {
3130         struct Scsi_Host *shost;
3131         struct sockaddr *dst_addr;
3132         int err;
3133
3134         if (!transport->send_ping)
3135                 return -ENOSYS;
3136
3137         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3138         if (!shost) {
3139                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3140                        ev->u.iscsi_ping.host_no);
3141                 return -ENODEV;
3142         }
3143
3144         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3145         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3146                                    ev->u.iscsi_ping.iface_type,
3147                                    ev->u.iscsi_ping.payload_size,
3148                                    ev->u.iscsi_ping.pid,
3149                                    dst_addr);
3150         scsi_host_put(shost);
3151         return err;
3152 }
3153
3154 static int
3155 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3156 {
3157         struct iscsi_uevent *ev = nlmsg_data(nlh);
3158         struct Scsi_Host *shost = NULL;
3159         struct iscsi_chap_rec *chap_rec;
3160         struct iscsi_internal *priv;
3161         struct sk_buff *skbchap;
3162         struct nlmsghdr *nlhchap;
3163         struct iscsi_uevent *evchap;
3164         uint32_t chap_buf_size;
3165         int len, err = 0;
3166         char *buf;
3167
3168         if (!transport->get_chap)
3169                 return -EINVAL;
3170
3171         priv = iscsi_if_transport_lookup(transport);
3172         if (!priv)
3173                 return -EINVAL;
3174
3175         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3176         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3177
3178         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3179         if (!shost) {
3180                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3181                        __func__, ev->u.get_chap.host_no);
3182                 return -ENODEV;
3183         }
3184
3185         do {
3186                 int actual_size;
3187
3188                 skbchap = alloc_skb(len, GFP_KERNEL);
3189                 if (!skbchap) {
3190                         printk(KERN_ERR "can not deliver chap: OOM\n");
3191                         err = -ENOMEM;
3192                         goto exit_get_chap;
3193                 }
3194
3195                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3196                                       (len - sizeof(*nlhchap)), 0);
3197                 evchap = nlmsg_data(nlhchap);
3198                 memset(evchap, 0, sizeof(*evchap));
3199                 evchap->transport_handle = iscsi_handle(transport);
3200                 evchap->type = nlh->nlmsg_type;
3201                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3202                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3203                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3204                 buf = (char *)evchap + sizeof(*evchap);
3205                 memset(buf, 0, chap_buf_size);
3206
3207                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3208                                     &evchap->u.get_chap.num_entries, buf);
3209
3210                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3211                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3212                 nlhchap->nlmsg_len = actual_size;
3213
3214                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3215                                           GFP_KERNEL);
3216         } while (err < 0 && err != -ECONNREFUSED);
3217
3218 exit_get_chap:
3219         scsi_host_put(shost);
3220         return err;
3221 }
3222
3223 static int iscsi_set_chap(struct iscsi_transport *transport,
3224                           struct iscsi_uevent *ev, uint32_t len)
3225 {
3226         char *data = (char *)ev + sizeof(*ev);
3227         struct Scsi_Host *shost;
3228         int err = 0;
3229
3230         if (!transport->set_chap)
3231                 return -ENOSYS;
3232
3233         shost = scsi_host_lookup(ev->u.set_path.host_no);
3234         if (!shost) {
3235                 pr_err("%s could not find host no %u\n",
3236                        __func__, ev->u.set_path.host_no);
3237                 return -ENODEV;
3238         }
3239
3240         err = transport->set_chap(shost, data, len);
3241         scsi_host_put(shost);
3242         return err;
3243 }
3244
3245 static int iscsi_delete_chap(struct iscsi_transport *transport,
3246                              struct iscsi_uevent *ev)
3247 {
3248         struct Scsi_Host *shost;
3249         int err = 0;
3250
3251         if (!transport->delete_chap)
3252                 return -ENOSYS;
3253
3254         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3255         if (!shost) {
3256                 printk(KERN_ERR "%s could not find host no %u\n",
3257                        __func__, ev->u.delete_chap.host_no);
3258                 return -ENODEV;
3259         }
3260
3261         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3262         scsi_host_put(shost);
3263         return err;
3264 }
3265
3266 static const struct {
3267         enum iscsi_discovery_parent_type value;
3268         char                            *name;
3269 } iscsi_discovery_parent_names[] = {
3270         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3271         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3272         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3273 };
3274
3275 char *iscsi_get_discovery_parent_name(int parent_type)
3276 {
3277         int i;
3278         char *state = "Unknown!";
3279
3280         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3281                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3282                         state = iscsi_discovery_parent_names[i].name;
3283                         break;
3284                 }
3285         }
3286         return state;
3287 }
3288 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3289
3290 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3291                                      struct iscsi_uevent *ev, uint32_t len)
3292 {
3293         char *data = (char *)ev + sizeof(*ev);
3294         struct Scsi_Host *shost;
3295         struct iscsi_bus_flash_session *fnode_sess;
3296         struct iscsi_bus_flash_conn *fnode_conn;
3297         struct device *dev;
3298         uint32_t idx;
3299         int err = 0;
3300
3301         if (!transport->set_flashnode_param) {
3302                 err = -ENOSYS;
3303                 goto exit_set_fnode;
3304         }
3305
3306         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3307         if (!shost) {
3308                 pr_err("%s could not find host no %u\n",
3309                        __func__, ev->u.set_flashnode.host_no);
3310                 err = -ENODEV;
3311                 goto exit_set_fnode;
3312         }
3313
3314         idx = ev->u.set_flashnode.flashnode_idx;
3315         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3316         if (!fnode_sess) {
3317                 pr_err("%s could not find flashnode %u for host no %u\n",
3318                        __func__, idx, ev->u.set_flashnode.host_no);
3319                 err = -ENODEV;
3320                 goto put_host;
3321         }
3322
3323         dev = iscsi_find_flashnode_conn(fnode_sess);
3324         if (!dev) {
3325                 err = -ENODEV;
3326                 goto put_sess;
3327         }
3328
3329         fnode_conn = iscsi_dev_to_flash_conn(dev);
3330         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3331         put_device(dev);
3332
3333 put_sess:
3334         put_device(&fnode_sess->dev);
3335
3336 put_host:
3337         scsi_host_put(shost);
3338
3339 exit_set_fnode:
3340         return err;
3341 }
3342
3343 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3344                                struct iscsi_uevent *ev, uint32_t len)
3345 {
3346         char *data = (char *)ev + sizeof(*ev);
3347         struct Scsi_Host *shost;
3348         int index;
3349         int err = 0;
3350
3351         if (!transport->new_flashnode) {
3352                 err = -ENOSYS;
3353                 goto exit_new_fnode;
3354         }
3355
3356         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3357         if (!shost) {
3358                 pr_err("%s could not find host no %u\n",
3359                        __func__, ev->u.new_flashnode.host_no);
3360                 err = -ENODEV;
3361                 goto put_host;
3362         }
3363
3364         index = transport->new_flashnode(shost, data, len);
3365
3366         if (index >= 0)
3367                 ev->r.new_flashnode_ret.flashnode_idx = index;
3368         else
3369                 err = -EIO;
3370
3371 put_host:
3372         scsi_host_put(shost);
3373
3374 exit_new_fnode:
3375         return err;
3376 }
3377
3378 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3379                                struct iscsi_uevent *ev)
3380 {
3381         struct Scsi_Host *shost;
3382         struct iscsi_bus_flash_session *fnode_sess;
3383         uint32_t idx;
3384         int err = 0;
3385
3386         if (!transport->del_flashnode) {
3387                 err = -ENOSYS;
3388                 goto exit_del_fnode;
3389         }
3390
3391         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3392         if (!shost) {
3393                 pr_err("%s could not find host no %u\n",
3394                        __func__, ev->u.del_flashnode.host_no);
3395                 err = -ENODEV;
3396                 goto put_host;
3397         }
3398
3399         idx = ev->u.del_flashnode.flashnode_idx;
3400         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3401         if (!fnode_sess) {
3402                 pr_err("%s could not find flashnode %u for host no %u\n",
3403                        __func__, idx, ev->u.del_flashnode.host_no);
3404                 err = -ENODEV;
3405                 goto put_host;
3406         }
3407
3408         err = transport->del_flashnode(fnode_sess);
3409         put_device(&fnode_sess->dev);
3410
3411 put_host:
3412         scsi_host_put(shost);
3413
3414 exit_del_fnode:
3415         return err;
3416 }
3417
3418 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3419                                  struct iscsi_uevent *ev)
3420 {
3421         struct Scsi_Host *shost;
3422         struct iscsi_bus_flash_session *fnode_sess;
3423         struct iscsi_bus_flash_conn *fnode_conn;
3424         struct device *dev;
3425         uint32_t idx;
3426         int err = 0;
3427
3428         if (!transport->login_flashnode) {
3429                 err = -ENOSYS;
3430                 goto exit_login_fnode;
3431         }
3432
3433         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3434         if (!shost) {
3435                 pr_err("%s could not find host no %u\n",
3436                        __func__, ev->u.login_flashnode.host_no);
3437                 err = -ENODEV;
3438                 goto put_host;
3439         }
3440
3441         idx = ev->u.login_flashnode.flashnode_idx;
3442         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3443         if (!fnode_sess) {
3444                 pr_err("%s could not find flashnode %u for host no %u\n",
3445                        __func__, idx, ev->u.login_flashnode.host_no);
3446                 err = -ENODEV;
3447                 goto put_host;
3448         }
3449
3450         dev = iscsi_find_flashnode_conn(fnode_sess);
3451         if (!dev) {
3452                 err = -ENODEV;
3453                 goto put_sess;
3454         }
3455
3456         fnode_conn = iscsi_dev_to_flash_conn(dev);
3457         err = transport->login_flashnode(fnode_sess, fnode_conn);
3458         put_device(dev);
3459
3460 put_sess:
3461         put_device(&fnode_sess->dev);
3462
3463 put_host:
3464         scsi_host_put(shost);
3465
3466 exit_login_fnode:
3467         return err;
3468 }
3469
3470 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3471                                   struct iscsi_uevent *ev)
3472 {
3473         struct Scsi_Host *shost;
3474         struct iscsi_bus_flash_session *fnode_sess;
3475         struct iscsi_bus_flash_conn *fnode_conn;
3476         struct device *dev;
3477         uint32_t idx;
3478         int err = 0;
3479
3480         if (!transport->logout_flashnode) {
3481                 err = -ENOSYS;
3482                 goto exit_logout_fnode;
3483         }
3484
3485         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3486         if (!shost) {
3487                 pr_err("%s could not find host no %u\n",
3488                        __func__, ev->u.logout_flashnode.host_no);
3489                 err = -ENODEV;
3490                 goto put_host;
3491         }
3492
3493         idx = ev->u.logout_flashnode.flashnode_idx;
3494         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3495         if (!fnode_sess) {
3496                 pr_err("%s could not find flashnode %u for host no %u\n",
3497                        __func__, idx, ev->u.logout_flashnode.host_no);
3498                 err = -ENODEV;
3499                 goto put_host;
3500         }
3501
3502         dev = iscsi_find_flashnode_conn(fnode_sess);
3503         if (!dev) {
3504                 err = -ENODEV;
3505                 goto put_sess;
3506         }
3507
3508         fnode_conn = iscsi_dev_to_flash_conn(dev);
3509
3510         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3511         put_device(dev);
3512
3513 put_sess:
3514         put_device(&fnode_sess->dev);
3515
3516 put_host:
3517         scsi_host_put(shost);
3518
3519 exit_logout_fnode:
3520         return err;
3521 }
3522
3523 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3524                                       struct iscsi_uevent *ev)
3525 {
3526         struct Scsi_Host *shost;
3527         struct iscsi_cls_session *session;
3528         int err = 0;
3529
3530         if (!transport->logout_flashnode_sid) {
3531                 err = -ENOSYS;
3532                 goto exit_logout_sid;
3533         }
3534
3535         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3536         if (!shost) {
3537                 pr_err("%s could not find host no %u\n",
3538                        __func__, ev->u.logout_flashnode.host_no);
3539                 err = -ENODEV;
3540                 goto put_host;
3541         }
3542
3543         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3544         if (!session) {
3545                 pr_err("%s could not find session id %u\n",
3546                        __func__, ev->u.logout_flashnode_sid.sid);
3547                 err = -EINVAL;
3548                 goto put_host;
3549         }
3550
3551         err = transport->logout_flashnode_sid(session);
3552
3553 put_host:
3554         scsi_host_put(shost);
3555
3556 exit_logout_sid:
3557         return err;
3558 }
3559
3560 static int
3561 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3562 {
3563         struct iscsi_uevent *ev = nlmsg_data(nlh);
3564         struct Scsi_Host *shost = NULL;
3565         struct iscsi_internal *priv;
3566         struct sk_buff *skbhost_stats;
3567         struct nlmsghdr *nlhhost_stats;
3568         struct iscsi_uevent *evhost_stats;
3569         int host_stats_size = 0;
3570         int len, err = 0;
3571         char *buf;
3572
3573         if (!transport->get_host_stats)
3574                 return -ENOSYS;
3575
3576         priv = iscsi_if_transport_lookup(transport);
3577         if (!priv)
3578                 return -EINVAL;
3579
3580         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3581         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3582
3583         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3584         if (!shost) {
3585                 pr_err("%s: failed. Could not find host no %u\n",
3586                        __func__, ev->u.get_host_stats.host_no);
3587                 return -ENODEV;
3588         }
3589
3590         do {
3591                 int actual_size;
3592
3593                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3594                 if (!skbhost_stats) {
3595                         pr_err("cannot deliver host stats: OOM\n");
3596                         err = -ENOMEM;
3597                         goto exit_host_stats;
3598                 }
3599
3600                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3601                                       (len - sizeof(*nlhhost_stats)), 0);
3602                 evhost_stats = nlmsg_data(nlhhost_stats);
3603                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3604                 evhost_stats->transport_handle = iscsi_handle(transport);
3605                 evhost_stats->type = nlh->nlmsg_type;
3606                 evhost_stats->u.get_host_stats.host_no =
3607                                         ev->u.get_host_stats.host_no;
3608                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3609                 memset(buf, 0, host_stats_size);
3610
3611                 err = transport->get_host_stats(shost, buf, host_stats_size);
3612                 if (err) {
3613                         kfree_skb(skbhost_stats);
3614                         goto exit_host_stats;
3615                 }
3616
3617                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3618                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3619                 nlhhost_stats->nlmsg_len = actual_size;
3620
3621                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3622                                           GFP_KERNEL);
3623         } while (err < 0 && err != -ECONNREFUSED);
3624
3625 exit_host_stats:
3626         scsi_host_put(shost);
3627         return err;
3628 }
3629
3630
3631 static int
3632 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3633 {
3634         int err = 0;
3635         u32 portid;
3636         u32 pdu_len;
3637         struct iscsi_uevent *ev = nlmsg_data(nlh);
3638         struct iscsi_transport *transport = NULL;
3639         struct iscsi_internal *priv;
3640         struct iscsi_cls_session *session;
3641         struct iscsi_cls_conn *conn;
3642         struct iscsi_endpoint *ep = NULL;
3643
3644         if (!netlink_capable(skb, CAP_SYS_ADMIN))
3645                 return -EPERM;
3646
3647         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3648                 *group = ISCSI_NL_GRP_UIP;
3649         else
3650                 *group = ISCSI_NL_GRP_ISCSID;
3651
3652         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3653         if (!priv)
3654                 return -EINVAL;
3655         transport = priv->iscsi_transport;
3656
3657         if (!try_module_get(transport->owner))
3658                 return -EINVAL;
3659
3660         portid = NETLINK_CB(skb).portid;
3661
3662         switch (nlh->nlmsg_type) {
3663         case ISCSI_UEVENT_CREATE_SESSION:
3664                 err = iscsi_if_create_session(priv, ep, ev,
3665                                               portid,
3666                                               ev->u.c_session.initial_cmdsn,
3667                                               ev->u.c_session.cmds_max,
3668                                               ev->u.c_session.queue_depth);
3669                 break;
3670         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3671                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3672                 if (!ep) {
3673                         err = -EINVAL;
3674                         break;
3675                 }
3676
3677                 err = iscsi_if_create_session(priv, ep, ev,
3678                                         portid,
3679                                         ev->u.c_bound_session.initial_cmdsn,
3680                                         ev->u.c_bound_session.cmds_max,
3681                                         ev->u.c_bound_session.queue_depth);
3682                 break;
3683         case ISCSI_UEVENT_DESTROY_SESSION:
3684                 session = iscsi_session_lookup(ev->u.d_session.sid);
3685                 if (!session)
3686                         err = -EINVAL;
3687                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3688                         err = -EBUSY;
3689                 else
3690                         transport->destroy_session(session);
3691                 break;
3692         case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3693                 session = iscsi_session_lookup(ev->u.d_session.sid);
3694                 if (!session)
3695                         err = -EINVAL;
3696                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3697                         err = -EBUSY;
3698                 else {
3699                         unsigned long flags;
3700
3701                         /* Prevent this session from being found again */
3702                         spin_lock_irqsave(&sesslock, flags);
3703                         list_del_init(&session->sess_list);
3704                         spin_unlock_irqrestore(&sesslock, flags);
3705
3706                         queue_work(iscsi_destroy_workq, &session->destroy_work);
3707                 }
3708                 break;
3709         case ISCSI_UEVENT_UNBIND_SESSION:
3710                 session = iscsi_session_lookup(ev->u.d_session.sid);
3711                 if (session)
3712                         scsi_queue_work(iscsi_session_to_shost(session),
3713                                         &session->unbind_work);
3714                 else
3715                         err = -EINVAL;
3716                 break;
3717         case ISCSI_UEVENT_CREATE_CONN:
3718                 err = iscsi_if_create_conn(transport, ev);
3719                 break;
3720         case ISCSI_UEVENT_DESTROY_CONN:
3721                 err = iscsi_if_destroy_conn(transport, ev);
3722                 break;
3723         case ISCSI_UEVENT_BIND_CONN:
3724                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3725                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3726
3727                 if (conn && conn->ep)
3728                         iscsi_if_ep_disconnect(transport, conn->ep->id);
3729
3730                 if (!session || !conn) {
3731                         err = -EINVAL;
3732                         break;
3733                 }
3734
3735                 mutex_lock(&conn_mutex);
3736                 ev->r.retcode = transport->bind_conn(session, conn,
3737                                                 ev->u.b_conn.transport_eph,
3738                                                 ev->u.b_conn.is_leading);
3739                 if (!ev->r.retcode)
3740                         conn->state = ISCSI_CONN_BOUND;
3741                 mutex_unlock(&conn_mutex);
3742
3743                 if (ev->r.retcode || !transport->ep_connect)
3744                         break;
3745
3746                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3747                 if (ep) {
3748                         ep->conn = conn;
3749
3750                         mutex_lock(&conn->ep_mutex);
3751                         conn->ep = ep;
3752                         mutex_unlock(&conn->ep_mutex);
3753                 } else
3754                         iscsi_cls_conn_printk(KERN_ERR, conn,
3755                                               "Could not set ep conn "
3756                                               "binding\n");
3757                 break;
3758         case ISCSI_UEVENT_SET_PARAM:
3759                 err = iscsi_set_param(transport, ev);
3760                 break;
3761         case ISCSI_UEVENT_START_CONN:
3762                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3763                 if (conn) {
3764                         mutex_lock(&conn_mutex);
3765                         ev->r.retcode = transport->start_conn(conn);
3766                         if (!ev->r.retcode)
3767                                 conn->state = ISCSI_CONN_UP;
3768                         mutex_unlock(&conn_mutex);
3769                 }
3770                 else
3771                         err = -EINVAL;
3772                 break;
3773         case ISCSI_UEVENT_STOP_CONN:
3774                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3775                 if (conn)
3776                         iscsi_if_stop_conn(conn, ev->u.stop_conn.flag);
3777                 else
3778                         err = -EINVAL;
3779                 break;
3780         case ISCSI_UEVENT_SEND_PDU:
3781                 pdu_len = nlh->nlmsg_len - sizeof(*nlh) - sizeof(*ev);
3782
3783                 if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3784                     (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3785                         err = -EINVAL;
3786                         break;
3787                 }
3788
3789                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3790                 if (conn) {
3791                         mutex_lock(&conn_mutex);
3792                         ev->r.retcode = transport->send_pdu(conn,
3793                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3794                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3795                                 ev->u.send_pdu.data_size);
3796                         mutex_unlock(&conn_mutex);
3797                 }
3798                 else
3799                         err = -EINVAL;
3800                 break;
3801         case ISCSI_UEVENT_GET_STATS:
3802                 err = iscsi_if_get_stats(transport, nlh);
3803                 break;
3804         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3805         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3806         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3807         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3808                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3809                 break;
3810         case ISCSI_UEVENT_TGT_DSCVR:
3811                 err = iscsi_tgt_dscvr(transport, ev);
3812                 break;
3813         case ISCSI_UEVENT_SET_HOST_PARAM:
3814                 err = iscsi_set_host_param(transport, ev);
3815                 break;
3816         case ISCSI_UEVENT_PATH_UPDATE:
3817                 err = iscsi_set_path(transport, ev);
3818                 break;
3819         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3820                 err = iscsi_set_iface_params(transport, ev,
3821                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3822                 break;
3823         case ISCSI_UEVENT_PING:
3824                 err = iscsi_send_ping(transport, ev);
3825                 break;
3826         case ISCSI_UEVENT_GET_CHAP:
3827                 err = iscsi_get_chap(transport, nlh);
3828                 break;
3829         case ISCSI_UEVENT_DELETE_CHAP:
3830                 err = iscsi_delete_chap(transport, ev);
3831                 break;
3832         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3833                 err = iscsi_set_flashnode_param(transport, ev,
3834                                                 nlmsg_attrlen(nlh,
3835                                                               sizeof(*ev)));
3836                 break;
3837         case ISCSI_UEVENT_NEW_FLASHNODE:
3838                 err = iscsi_new_flashnode(transport, ev,
3839                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3840                 break;
3841         case ISCSI_UEVENT_DEL_FLASHNODE:
3842                 err = iscsi_del_flashnode(transport, ev);
3843                 break;
3844         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3845                 err = iscsi_login_flashnode(transport, ev);
3846                 break;
3847         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3848                 err = iscsi_logout_flashnode(transport, ev);
3849                 break;
3850         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3851                 err = iscsi_logout_flashnode_sid(transport, ev);
3852                 break;
3853         case ISCSI_UEVENT_SET_CHAP:
3854                 err = iscsi_set_chap(transport, ev,
3855                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3856                 break;
3857         case ISCSI_UEVENT_GET_HOST_STATS:
3858                 err = iscsi_get_host_stats(transport, nlh);
3859                 break;
3860         default:
3861                 err = -ENOSYS;
3862                 break;
3863         }
3864
3865         module_put(transport->owner);
3866         return err;
3867 }
3868
3869 /*
3870  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3871  * Malformed skbs with wrong lengths or invalid creds are not processed.
3872  */
3873 static void
3874 iscsi_if_rx(struct sk_buff *skb)
3875 {
3876         u32 portid = NETLINK_CB(skb).portid;
3877
3878         mutex_lock(&rx_queue_mutex);
3879         while (skb->len >= NLMSG_HDRLEN) {
3880                 int err;
3881                 uint32_t rlen;
3882                 struct nlmsghdr *nlh;
3883                 struct iscsi_uevent *ev;
3884                 uint32_t group;
3885                 int retries = ISCSI_SEND_MAX_ALLOWED;
3886
3887                 nlh = nlmsg_hdr(skb);
3888                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3889                     skb->len < nlh->nlmsg_len) {
3890                         break;
3891                 }
3892
3893                 ev = nlmsg_data(nlh);
3894                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3895                 if (rlen > skb->len)
3896                         rlen = skb->len;
3897
3898                 err = iscsi_if_recv_msg(skb, nlh, &group);
3899                 if (err) {
3900                         ev->type = ISCSI_KEVENT_IF_ERROR;
3901                         ev->iferror = err;
3902                 }
3903                 do {
3904                         /*
3905                          * special case for GET_STATS:
3906                          * on success - sending reply and stats from
3907                          * inside of if_recv_msg(),
3908                          * on error - fall through.
3909                          */
3910                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3911                                 break;
3912                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3913                                 break;
3914                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
3915                                                   ev, sizeof(*ev));
3916                         if (err == -EAGAIN && --retries < 0) {
3917                                 printk(KERN_WARNING "Send reply failed, error %d\n", err);
3918                                 break;
3919                         }
3920                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3921                 skb_pull(skb, rlen);
3922         }
3923         mutex_unlock(&rx_queue_mutex);
3924 }
3925
3926 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
3927 struct device_attribute dev_attr_##_prefix##_##_name =  \
3928         __ATTR(_name,_mode,_show,_store)
3929
3930 /*
3931  * iSCSI connection attrs
3932  */
3933 #define iscsi_conn_attr_show(param)                                     \
3934 static ssize_t                                                          \
3935 show_conn_param_##param(struct device *dev,                             \
3936                         struct device_attribute *attr, char *buf)       \
3937 {                                                                       \
3938         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3939         struct iscsi_transport *t = conn->transport;                    \
3940         return t->get_conn_param(conn, param, buf);                     \
3941 }
3942
3943 #define iscsi_conn_attr(field, param)                                   \
3944         iscsi_conn_attr_show(param)                                     \
3945 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
3946                         NULL);
3947
3948 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3949 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3950 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3951 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3952 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3953 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3954 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3955 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3956 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3957 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3958 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3959 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3960 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3961 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3962 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3963 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3964 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3965 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3966 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3967 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3968 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3969 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3970 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3971 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3972 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3973 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3974 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3975 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3976
3977 static const char *const connection_state_names[] = {
3978         [ISCSI_CONN_UP] = "up",
3979         [ISCSI_CONN_DOWN] = "down",
3980         [ISCSI_CONN_FAILED] = "failed",
3981         [ISCSI_CONN_BOUND] = "bound"
3982 };
3983
3984 static ssize_t show_conn_state(struct device *dev,
3985                                struct device_attribute *attr, char *buf)
3986 {
3987         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
3988         const char *state = "unknown";
3989
3990         if (conn->state >= 0 &&
3991             conn->state < ARRAY_SIZE(connection_state_names))
3992                 state = connection_state_names[conn->state];
3993
3994         return sysfs_emit(buf, "%s\n", state);
3995 }
3996 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
3997                         NULL);
3998
3999 #define iscsi_conn_ep_attr_show(param)                                  \
4000 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
4001                                           struct device_attribute *attr,\
4002                                           char *buf)                    \
4003 {                                                                       \
4004         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4005         struct iscsi_transport *t = conn->transport;                    \
4006         struct iscsi_endpoint *ep;                                      \
4007         ssize_t rc;                                                     \
4008                                                                         \
4009         /*                                                              \
4010          * Need to make sure ep_disconnect does not free the LLD's      \
4011          * interconnect resources while we are trying to read them.     \
4012          */                                                             \
4013         mutex_lock(&conn->ep_mutex);                                    \
4014         ep = conn->ep;                                                  \
4015         if (!ep && t->ep_connect) {                                     \
4016                 mutex_unlock(&conn->ep_mutex);                          \
4017                 return -ENOTCONN;                                       \
4018         }                                                               \
4019                                                                         \
4020         if (ep)                                                         \
4021                 rc = t->get_ep_param(ep, param, buf);                   \
4022         else                                                            \
4023                 rc = t->get_conn_param(conn, param, buf);               \
4024         mutex_unlock(&conn->ep_mutex);                                  \
4025         return rc;                                                      \
4026 }
4027
4028 #define iscsi_conn_ep_attr(field, param)                                \
4029         iscsi_conn_ep_attr_show(param)                                  \
4030 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
4031                         show_conn_ep_param_##param, NULL);
4032
4033 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4034 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4035
4036 static struct attribute *iscsi_conn_attrs[] = {
4037         &dev_attr_conn_max_recv_dlength.attr,
4038         &dev_attr_conn_max_xmit_dlength.attr,
4039         &dev_attr_conn_header_digest.attr,
4040         &dev_attr_conn_data_digest.attr,
4041         &dev_attr_conn_ifmarker.attr,
4042         &dev_attr_conn_ofmarker.attr,
4043         &dev_attr_conn_address.attr,
4044         &dev_attr_conn_port.attr,
4045         &dev_attr_conn_exp_statsn.attr,
4046         &dev_attr_conn_persistent_address.attr,
4047         &dev_attr_conn_persistent_port.attr,
4048         &dev_attr_conn_ping_tmo.attr,
4049         &dev_attr_conn_recv_tmo.attr,
4050         &dev_attr_conn_local_port.attr,
4051         &dev_attr_conn_statsn.attr,
4052         &dev_attr_conn_keepalive_tmo.attr,
4053         &dev_attr_conn_max_segment_size.attr,
4054         &dev_attr_conn_tcp_timestamp_stat.attr,
4055         &dev_attr_conn_tcp_wsf_disable.attr,
4056         &dev_attr_conn_tcp_nagle_disable.attr,
4057         &dev_attr_conn_tcp_timer_scale.attr,
4058         &dev_attr_conn_tcp_timestamp_enable.attr,
4059         &dev_attr_conn_fragment_disable.attr,
4060         &dev_attr_conn_ipv4_tos.attr,
4061         &dev_attr_conn_ipv6_traffic_class.attr,
4062         &dev_attr_conn_ipv6_flow_label.attr,
4063         &dev_attr_conn_is_fw_assigned_ipv6.attr,
4064         &dev_attr_conn_tcp_xmit_wsf.attr,
4065         &dev_attr_conn_tcp_recv_wsf.attr,
4066         &dev_attr_conn_local_ipaddr.attr,
4067         &dev_attr_conn_state.attr,
4068         NULL,
4069 };
4070
4071 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4072                                          struct attribute *attr, int i)
4073 {
4074         struct device *cdev = container_of(kobj, struct device, kobj);
4075         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4076         struct iscsi_transport *t = conn->transport;
4077         int param;
4078
4079         if (attr == &dev_attr_conn_max_recv_dlength.attr)
4080                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4081         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4082                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4083         else if (attr == &dev_attr_conn_header_digest.attr)
4084                 param = ISCSI_PARAM_HDRDGST_EN;
4085         else if (attr == &dev_attr_conn_data_digest.attr)
4086                 param = ISCSI_PARAM_DATADGST_EN;
4087         else if (attr == &dev_attr_conn_ifmarker.attr)
4088                 param = ISCSI_PARAM_IFMARKER_EN;
4089         else if (attr == &dev_attr_conn_ofmarker.attr)
4090                 param = ISCSI_PARAM_OFMARKER_EN;
4091         else if (attr == &dev_attr_conn_address.attr)
4092                 param = ISCSI_PARAM_CONN_ADDRESS;
4093         else if (attr == &dev_attr_conn_port.attr)
4094                 param = ISCSI_PARAM_CONN_PORT;
4095         else if (attr == &dev_attr_conn_exp_statsn.attr)
4096                 param = ISCSI_PARAM_EXP_STATSN;
4097         else if (attr == &dev_attr_conn_persistent_address.attr)
4098                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4099         else if (attr == &dev_attr_conn_persistent_port.attr)
4100                 param = ISCSI_PARAM_PERSISTENT_PORT;
4101         else if (attr == &dev_attr_conn_ping_tmo.attr)
4102                 param = ISCSI_PARAM_PING_TMO;
4103         else if (attr == &dev_attr_conn_recv_tmo.attr)
4104                 param = ISCSI_PARAM_RECV_TMO;
4105         else if (attr == &dev_attr_conn_local_port.attr)
4106                 param = ISCSI_PARAM_LOCAL_PORT;
4107         else if (attr == &dev_attr_conn_statsn.attr)
4108                 param = ISCSI_PARAM_STATSN;
4109         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4110                 param = ISCSI_PARAM_KEEPALIVE_TMO;
4111         else if (attr == &dev_attr_conn_max_segment_size.attr)
4112                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4113         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4114                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4115         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4116                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
4117         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4118                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4119         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4120                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
4121         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4122                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4123         else if (attr == &dev_attr_conn_fragment_disable.attr)
4124                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4125         else if (attr == &dev_attr_conn_ipv4_tos.attr)
4126                 param = ISCSI_PARAM_IPV4_TOS;
4127         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4128                 param = ISCSI_PARAM_IPV6_TC;
4129         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4130                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4131         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4132                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4133         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4134                 param = ISCSI_PARAM_TCP_XMIT_WSF;
4135         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4136                 param = ISCSI_PARAM_TCP_RECV_WSF;
4137         else if (attr == &dev_attr_conn_local_ipaddr.attr)
4138                 param = ISCSI_PARAM_LOCAL_IPADDR;
4139         else if (attr == &dev_attr_conn_state.attr)
4140                 return S_IRUGO;
4141         else {
4142                 WARN_ONCE(1, "Invalid conn attr");
4143                 return 0;
4144         }
4145
4146         return t->attr_is_visible(ISCSI_PARAM, param);
4147 }
4148
4149 static struct attribute_group iscsi_conn_group = {
4150         .attrs = iscsi_conn_attrs,
4151         .is_visible = iscsi_conn_attr_is_visible,
4152 };
4153
4154 /*
4155  * iSCSI session attrs
4156  */
4157 #define iscsi_session_attr_show(param, perm)                            \
4158 static ssize_t                                                          \
4159 show_session_param_##param(struct device *dev,                          \
4160                            struct device_attribute *attr, char *buf)    \
4161 {                                                                       \
4162         struct iscsi_cls_session *session =                             \
4163                 iscsi_dev_to_session(dev->parent);                      \
4164         struct iscsi_transport *t = session->transport;                 \
4165                                                                         \
4166         if (perm && !capable(CAP_SYS_ADMIN))                            \
4167                 return -EACCES;                                         \
4168         return t->get_session_param(session, param, buf);               \
4169 }
4170
4171 #define iscsi_session_attr(field, param, perm)                          \
4172         iscsi_session_attr_show(param, perm)                            \
4173 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4174                         NULL);
4175 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4176 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4177 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4178 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4179 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4180 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4181 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4182 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4183 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4184 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4185 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4186 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4187 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4188 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4189 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4190 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4191 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4192 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4193 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4194 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4195 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4196 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4197 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4198 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4199 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4200 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4201 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4202 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4203 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4204 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4205 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4206 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4207 iscsi_session_attr(discovery_auth_optional,
4208                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4209 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4210 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4211 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4212 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4213 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4214 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4215 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4216
4217 static ssize_t
4218 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4219                         char *buf)
4220 {
4221         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4222         return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4223 }
4224 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4225                         NULL);
4226 static ssize_t
4227 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4228                         char *buf)
4229 {
4230         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4231         return sysfs_emit(buf, "%d\n", session->creator);
4232 }
4233 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4234                         NULL);
4235 static ssize_t
4236 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4237                             char *buf)
4238 {
4239         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4240         return sysfs_emit(buf, "%d\n", session->target_id);
4241 }
4242 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4243                         show_priv_session_target_id, NULL);
4244
4245 #define iscsi_priv_session_attr_show(field, format)                     \
4246 static ssize_t                                                          \
4247 show_priv_session_##field(struct device *dev,                           \
4248                           struct device_attribute *attr, char *buf)     \
4249 {                                                                       \
4250         struct iscsi_cls_session *session =                             \
4251                         iscsi_dev_to_session(dev->parent);              \
4252         if (session->field == -1)                                       \
4253                 return sysfs_emit(buf, "off\n");                        \
4254         return sysfs_emit(buf, format"\n", session->field);             \
4255 }
4256
4257 #define iscsi_priv_session_attr_store(field)                            \
4258 static ssize_t                                                          \
4259 store_priv_session_##field(struct device *dev,                          \
4260                            struct device_attribute *attr,               \
4261                            const char *buf, size_t count)               \
4262 {                                                                       \
4263         int val;                                                        \
4264         char *cp;                                                       \
4265         struct iscsi_cls_session *session =                             \
4266                 iscsi_dev_to_session(dev->parent);                      \
4267         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4268             (session->state == ISCSI_SESSION_FAILED))                   \
4269                 return -EBUSY;                                          \
4270         if (strncmp(buf, "off", 3) == 0) {                              \
4271                 session->field = -1;                                    \
4272                 session->field##_sysfs_override = true;                 \
4273         } else {                                                        \
4274                 val = simple_strtoul(buf, &cp, 0);                      \
4275                 if (*cp != '\0' && *cp != '\n')                         \
4276                         return -EINVAL;                                 \
4277                 session->field = val;                                   \
4278                 session->field##_sysfs_override = true;                 \
4279         }                                                               \
4280         return count;                                                   \
4281 }
4282
4283 #define iscsi_priv_session_rw_attr(field, format)                       \
4284         iscsi_priv_session_attr_show(field, format)                     \
4285         iscsi_priv_session_attr_store(field)                            \
4286 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4287                         show_priv_session_##field,                      \
4288                         store_priv_session_##field)
4289
4290 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4291
4292 static struct attribute *iscsi_session_attrs[] = {
4293         &dev_attr_sess_initial_r2t.attr,
4294         &dev_attr_sess_max_outstanding_r2t.attr,
4295         &dev_attr_sess_immediate_data.attr,
4296         &dev_attr_sess_first_burst_len.attr,
4297         &dev_attr_sess_max_burst_len.attr,
4298         &dev_attr_sess_data_pdu_in_order.attr,
4299         &dev_attr_sess_data_seq_in_order.attr,
4300         &dev_attr_sess_erl.attr,
4301         &dev_attr_sess_targetname.attr,
4302         &dev_attr_sess_tpgt.attr,
4303         &dev_attr_sess_password.attr,
4304         &dev_attr_sess_password_in.attr,
4305         &dev_attr_sess_username.attr,
4306         &dev_attr_sess_username_in.attr,
4307         &dev_attr_sess_fast_abort.attr,
4308         &dev_attr_sess_abort_tmo.attr,
4309         &dev_attr_sess_lu_reset_tmo.attr,
4310         &dev_attr_sess_tgt_reset_tmo.attr,
4311         &dev_attr_sess_ifacename.attr,
4312         &dev_attr_sess_initiatorname.attr,
4313         &dev_attr_sess_targetalias.attr,
4314         &dev_attr_sess_boot_root.attr,
4315         &dev_attr_sess_boot_nic.attr,
4316         &dev_attr_sess_boot_target.attr,
4317         &dev_attr_priv_sess_recovery_tmo.attr,
4318         &dev_attr_priv_sess_state.attr,
4319         &dev_attr_priv_sess_creator.attr,
4320         &dev_attr_sess_chap_out_idx.attr,
4321         &dev_attr_sess_chap_in_idx.attr,
4322         &dev_attr_priv_sess_target_id.attr,
4323         &dev_attr_sess_auto_snd_tgt_disable.attr,
4324         &dev_attr_sess_discovery_session.attr,
4325         &dev_attr_sess_portal_type.attr,
4326         &dev_attr_sess_chap_auth.attr,
4327         &dev_attr_sess_discovery_logout.attr,
4328         &dev_attr_sess_bidi_chap.attr,
4329         &dev_attr_sess_discovery_auth_optional.attr,
4330         &dev_attr_sess_def_time2wait.attr,
4331         &dev_attr_sess_def_time2retain.attr,
4332         &dev_attr_sess_isid.attr,
4333         &dev_attr_sess_tsid.attr,
4334         &dev_attr_sess_def_taskmgmt_tmo.attr,
4335         &dev_attr_sess_discovery_parent_idx.attr,
4336         &dev_attr_sess_discovery_parent_type.attr,
4337         NULL,
4338 };
4339
4340 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4341                                             struct attribute *attr, int i)
4342 {
4343         struct device *cdev = container_of(kobj, struct device, kobj);
4344         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4345         struct iscsi_transport *t = session->transport;
4346         int param;
4347
4348         if (attr == &dev_attr_sess_initial_r2t.attr)
4349                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4350         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4351                 param = ISCSI_PARAM_MAX_R2T;
4352         else if (attr == &dev_attr_sess_immediate_data.attr)
4353                 param = ISCSI_PARAM_IMM_DATA_EN;
4354         else if (attr == &dev_attr_sess_first_burst_len.attr)
4355                 param = ISCSI_PARAM_FIRST_BURST;
4356         else if (attr == &dev_attr_sess_max_burst_len.attr)
4357                 param = ISCSI_PARAM_MAX_BURST;
4358         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4359                 param = ISCSI_PARAM_PDU_INORDER_EN;
4360         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4361                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4362         else if (attr == &dev_attr_sess_erl.attr)
4363                 param = ISCSI_PARAM_ERL;
4364         else if (attr == &dev_attr_sess_targetname.attr)
4365                 param = ISCSI_PARAM_TARGET_NAME;
4366         else if (attr == &dev_attr_sess_tpgt.attr)
4367                 param = ISCSI_PARAM_TPGT;
4368         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4369                 param = ISCSI_PARAM_CHAP_IN_IDX;
4370         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4371                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4372         else if (attr == &dev_attr_sess_password.attr)
4373                 param = ISCSI_PARAM_USERNAME;
4374         else if (attr == &dev_attr_sess_password_in.attr)
4375                 param = ISCSI_PARAM_USERNAME_IN;
4376         else if (attr == &dev_attr_sess_username.attr)
4377                 param = ISCSI_PARAM_PASSWORD;
4378         else if (attr == &dev_attr_sess_username_in.attr)
4379                 param = ISCSI_PARAM_PASSWORD_IN;
4380         else if (attr == &dev_attr_sess_fast_abort.attr)
4381                 param = ISCSI_PARAM_FAST_ABORT;
4382         else if (attr == &dev_attr_sess_abort_tmo.attr)
4383                 param = ISCSI_PARAM_ABORT_TMO;
4384         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4385                 param = ISCSI_PARAM_LU_RESET_TMO;
4386         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4387                 param = ISCSI_PARAM_TGT_RESET_TMO;
4388         else if (attr == &dev_attr_sess_ifacename.attr)
4389                 param = ISCSI_PARAM_IFACE_NAME;
4390         else if (attr == &dev_attr_sess_initiatorname.attr)
4391                 param = ISCSI_PARAM_INITIATOR_NAME;
4392         else if (attr == &dev_attr_sess_targetalias.attr)
4393                 param = ISCSI_PARAM_TARGET_ALIAS;
4394         else if (attr == &dev_attr_sess_boot_root.attr)
4395                 param = ISCSI_PARAM_BOOT_ROOT;
4396         else if (attr == &dev_attr_sess_boot_nic.attr)
4397                 param = ISCSI_PARAM_BOOT_NIC;
4398         else if (attr == &dev_attr_sess_boot_target.attr)
4399                 param = ISCSI_PARAM_BOOT_TARGET;
4400         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4401                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4402         else if (attr == &dev_attr_sess_discovery_session.attr)
4403                 param = ISCSI_PARAM_DISCOVERY_SESS;
4404         else if (attr == &dev_attr_sess_portal_type.attr)
4405                 param = ISCSI_PARAM_PORTAL_TYPE;
4406         else if (attr == &dev_attr_sess_chap_auth.attr)
4407                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4408         else if (attr == &dev_attr_sess_discovery_logout.attr)
4409                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4410         else if (attr == &dev_attr_sess_bidi_chap.attr)
4411                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4412         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4413                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4414         else if (attr == &dev_attr_sess_def_time2wait.attr)
4415                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4416         else if (attr == &dev_attr_sess_def_time2retain.attr)
4417                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4418         else if (attr == &dev_attr_sess_isid.attr)
4419                 param = ISCSI_PARAM_ISID;
4420         else if (attr == &dev_attr_sess_tsid.attr)
4421                 param = ISCSI_PARAM_TSID;
4422         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4423                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4424         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4425                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4426         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4427                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4428         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4429                 return S_IRUGO | S_IWUSR;
4430         else if (attr == &dev_attr_priv_sess_state.attr)
4431                 return S_IRUGO;
4432         else if (attr == &dev_attr_priv_sess_creator.attr)
4433                 return S_IRUGO;
4434         else if (attr == &dev_attr_priv_sess_target_id.attr)
4435                 return S_IRUGO;
4436         else {
4437                 WARN_ONCE(1, "Invalid session attr");
4438                 return 0;
4439         }
4440
4441         return t->attr_is_visible(ISCSI_PARAM, param);
4442 }
4443
4444 static struct attribute_group iscsi_session_group = {
4445         .attrs = iscsi_session_attrs,
4446         .is_visible = iscsi_session_attr_is_visible,
4447 };
4448
4449 /*
4450  * iSCSI host attrs
4451  */
4452 #define iscsi_host_attr_show(param)                                     \
4453 static ssize_t                                                          \
4454 show_host_param_##param(struct device *dev,                             \
4455                         struct device_attribute *attr, char *buf)       \
4456 {                                                                       \
4457         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4458         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4459         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4460 }
4461
4462 #define iscsi_host_attr(field, param)                                   \
4463         iscsi_host_attr_show(param)                                     \
4464 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4465                         NULL);
4466
4467 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4468 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4469 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4470 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4471 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4472 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4473
4474 static struct attribute *iscsi_host_attrs[] = {
4475         &dev_attr_host_netdev.attr,
4476         &dev_attr_host_hwaddress.attr,
4477         &dev_attr_host_ipaddress.attr,
4478         &dev_attr_host_initiatorname.attr,
4479         &dev_attr_host_port_state.attr,
4480         &dev_attr_host_port_speed.attr,
4481         NULL,
4482 };
4483
4484 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4485                                          struct attribute *attr, int i)
4486 {
4487         struct device *cdev = container_of(kobj, struct device, kobj);
4488         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4489         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4490         int param;
4491
4492         if (attr == &dev_attr_host_netdev.attr)
4493                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4494         else if (attr == &dev_attr_host_hwaddress.attr)
4495                 param = ISCSI_HOST_PARAM_HWADDRESS;
4496         else if (attr == &dev_attr_host_ipaddress.attr)
4497                 param = ISCSI_HOST_PARAM_IPADDRESS;
4498         else if (attr == &dev_attr_host_initiatorname.attr)
4499                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4500         else if (attr == &dev_attr_host_port_state.attr)
4501                 param = ISCSI_HOST_PARAM_PORT_STATE;
4502         else if (attr == &dev_attr_host_port_speed.attr)
4503                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4504         else {
4505                 WARN_ONCE(1, "Invalid host attr");
4506                 return 0;
4507         }
4508
4509         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4510 }
4511
4512 static struct attribute_group iscsi_host_group = {
4513         .attrs = iscsi_host_attrs,
4514         .is_visible = iscsi_host_attr_is_visible,
4515 };
4516
4517 /* convert iscsi_port_speed values to ascii string name */
4518 static const struct {
4519         enum iscsi_port_speed   value;
4520         char                    *name;
4521 } iscsi_port_speed_names[] = {
4522         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4523         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4524         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4525         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4526         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4527         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4528         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4529 };
4530
4531 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4532 {
4533         int i;
4534         char *speed = "Unknown!";
4535         struct iscsi_cls_host *ihost = shost->shost_data;
4536         uint32_t port_speed = ihost->port_speed;
4537
4538         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4539                 if (iscsi_port_speed_names[i].value & port_speed) {
4540                         speed = iscsi_port_speed_names[i].name;
4541                         break;
4542                 }
4543         }
4544         return speed;
4545 }
4546 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4547
4548 /* convert iscsi_port_state values to ascii string name */
4549 static const struct {
4550         enum iscsi_port_state   value;
4551         char                    *name;
4552 } iscsi_port_state_names[] = {
4553         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4554         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4555 };
4556
4557 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4558 {
4559         int i;
4560         char *state = "Unknown!";
4561         struct iscsi_cls_host *ihost = shost->shost_data;
4562         uint32_t port_state = ihost->port_state;
4563
4564         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4565                 if (iscsi_port_state_names[i].value & port_state) {
4566                         state = iscsi_port_state_names[i].name;
4567                         break;
4568                 }
4569         }
4570         return state;
4571 }
4572 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4573
4574 static int iscsi_session_match(struct attribute_container *cont,
4575                            struct device *dev)
4576 {
4577         struct iscsi_cls_session *session;
4578         struct Scsi_Host *shost;
4579         struct iscsi_internal *priv;
4580
4581         if (!iscsi_is_session_dev(dev))
4582                 return 0;
4583
4584         session = iscsi_dev_to_session(dev);
4585         shost = iscsi_session_to_shost(session);
4586         if (!shost->transportt)
4587                 return 0;
4588
4589         priv = to_iscsi_internal(shost->transportt);
4590         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4591                 return 0;
4592
4593         return &priv->session_cont.ac == cont;
4594 }
4595
4596 static int iscsi_conn_match(struct attribute_container *cont,
4597                            struct device *dev)
4598 {
4599         struct iscsi_cls_session *session;
4600         struct iscsi_cls_conn *conn;
4601         struct Scsi_Host *shost;
4602         struct iscsi_internal *priv;
4603
4604         if (!iscsi_is_conn_dev(dev))
4605                 return 0;
4606
4607         conn = iscsi_dev_to_conn(dev);
4608         session = iscsi_dev_to_session(conn->dev.parent);
4609         shost = iscsi_session_to_shost(session);
4610
4611         if (!shost->transportt)
4612                 return 0;
4613
4614         priv = to_iscsi_internal(shost->transportt);
4615         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4616                 return 0;
4617
4618         return &priv->conn_cont.ac == cont;
4619 }
4620
4621 static int iscsi_host_match(struct attribute_container *cont,
4622                             struct device *dev)
4623 {
4624         struct Scsi_Host *shost;
4625         struct iscsi_internal *priv;
4626
4627         if (!scsi_is_host_device(dev))
4628                 return 0;
4629
4630         shost = dev_to_shost(dev);
4631         if (!shost->transportt  ||
4632             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4633                 return 0;
4634
4635         priv = to_iscsi_internal(shost->transportt);
4636         return &priv->t.host_attrs.ac == cont;
4637 }
4638
4639 struct scsi_transport_template *
4640 iscsi_register_transport(struct iscsi_transport *tt)
4641 {
4642         struct iscsi_internal *priv;
4643         unsigned long flags;
4644         int err;
4645
4646         BUG_ON(!tt);
4647
4648         priv = iscsi_if_transport_lookup(tt);
4649         if (priv)
4650                 return NULL;
4651
4652         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4653         if (!priv)
4654                 return NULL;
4655         INIT_LIST_HEAD(&priv->list);
4656         priv->iscsi_transport = tt;
4657         priv->t.user_scan = iscsi_user_scan;
4658         priv->t.create_work_queue = 1;
4659
4660         priv->dev.class = &iscsi_transport_class;
4661         dev_set_name(&priv->dev, "%s", tt->name);
4662         err = device_register(&priv->dev);
4663         if (err)
4664                 goto free_priv;
4665
4666         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4667         if (err)
4668                 goto unregister_dev;
4669
4670         /* host parameters */
4671         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4672         priv->t.host_attrs.ac.match = iscsi_host_match;
4673         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4674         priv->t.host_size = sizeof(struct iscsi_cls_host);
4675         transport_container_register(&priv->t.host_attrs);
4676
4677         /* connection parameters */
4678         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4679         priv->conn_cont.ac.match = iscsi_conn_match;
4680         priv->conn_cont.ac.grp = &iscsi_conn_group;
4681         transport_container_register(&priv->conn_cont);
4682
4683         /* session parameters */
4684         priv->session_cont.ac.class = &iscsi_session_class.class;
4685         priv->session_cont.ac.match = iscsi_session_match;
4686         priv->session_cont.ac.grp = &iscsi_session_group;
4687         transport_container_register(&priv->session_cont);
4688
4689         spin_lock_irqsave(&iscsi_transport_lock, flags);
4690         list_add(&priv->list, &iscsi_transports);
4691         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4692
4693         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4694         return &priv->t;
4695
4696 unregister_dev:
4697         device_unregister(&priv->dev);
4698         return NULL;
4699 free_priv:
4700         kfree(priv);
4701         return NULL;
4702 }
4703 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4704
4705 int iscsi_unregister_transport(struct iscsi_transport *tt)
4706 {
4707         struct iscsi_internal *priv;
4708         unsigned long flags;
4709
4710         BUG_ON(!tt);
4711
4712         mutex_lock(&rx_queue_mutex);
4713
4714         priv = iscsi_if_transport_lookup(tt);
4715         BUG_ON (!priv);
4716
4717         spin_lock_irqsave(&iscsi_transport_lock, flags);
4718         list_del(&priv->list);
4719         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4720
4721         transport_container_unregister(&priv->conn_cont);
4722         transport_container_unregister(&priv->session_cont);
4723         transport_container_unregister(&priv->t.host_attrs);
4724
4725         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4726         device_unregister(&priv->dev);
4727         mutex_unlock(&rx_queue_mutex);
4728
4729         return 0;
4730 }
4731 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4732
4733 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4734                      struct device *dev, const char *fmt, ...)
4735 {
4736         struct va_format vaf;
4737         va_list args;
4738
4739         va_start(args, fmt);
4740         vaf.fmt = fmt;
4741         vaf.va = &args;
4742         trace(dev, &vaf);
4743         va_end(args);
4744 }
4745 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4746
4747 static __init int iscsi_transport_init(void)
4748 {
4749         int err;
4750         struct netlink_kernel_cfg cfg = {
4751                 .groups = 1,
4752                 .input  = iscsi_if_rx,
4753         };
4754         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4755                 ISCSI_TRANSPORT_VERSION);
4756
4757         atomic_set(&iscsi_session_nr, 0);
4758
4759         err = class_register(&iscsi_transport_class);
4760         if (err)
4761                 return err;
4762
4763         err = class_register(&iscsi_endpoint_class);
4764         if (err)
4765                 goto unregister_transport_class;
4766
4767         err = class_register(&iscsi_iface_class);
4768         if (err)
4769                 goto unregister_endpoint_class;
4770
4771         err = transport_class_register(&iscsi_host_class);
4772         if (err)
4773                 goto unregister_iface_class;
4774
4775         err = transport_class_register(&iscsi_connection_class);
4776         if (err)
4777                 goto unregister_host_class;
4778
4779         err = transport_class_register(&iscsi_session_class);
4780         if (err)
4781                 goto unregister_conn_class;
4782
4783         err = bus_register(&iscsi_flashnode_bus);
4784         if (err)
4785                 goto unregister_session_class;
4786
4787         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4788         if (!nls) {
4789                 err = -ENOBUFS;
4790                 goto unregister_flashnode_bus;
4791         }
4792
4793         iscsi_eh_timer_workq = alloc_workqueue("%s",
4794                         WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
4795                         1, "iscsi_eh");
4796         if (!iscsi_eh_timer_workq) {
4797                 err = -ENOMEM;
4798                 goto release_nls;
4799         }
4800
4801         iscsi_destroy_workq = alloc_workqueue("%s",
4802                         WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
4803                         1, "iscsi_destroy");
4804         if (!iscsi_destroy_workq) {
4805                 err = -ENOMEM;
4806                 goto destroy_wq;
4807         }
4808
4809         return 0;
4810
4811 destroy_wq:
4812         destroy_workqueue(iscsi_eh_timer_workq);
4813 release_nls:
4814         netlink_kernel_release(nls);
4815 unregister_flashnode_bus:
4816         bus_unregister(&iscsi_flashnode_bus);
4817 unregister_session_class:
4818         transport_class_unregister(&iscsi_session_class);
4819 unregister_conn_class:
4820         transport_class_unregister(&iscsi_connection_class);
4821 unregister_host_class:
4822         transport_class_unregister(&iscsi_host_class);
4823 unregister_iface_class:
4824         class_unregister(&iscsi_iface_class);
4825 unregister_endpoint_class:
4826         class_unregister(&iscsi_endpoint_class);
4827 unregister_transport_class:
4828         class_unregister(&iscsi_transport_class);
4829         return err;
4830 }
4831
4832 static void __exit iscsi_transport_exit(void)
4833 {
4834         destroy_workqueue(iscsi_destroy_workq);
4835         destroy_workqueue(iscsi_eh_timer_workq);
4836         netlink_kernel_release(nls);
4837         bus_unregister(&iscsi_flashnode_bus);
4838         transport_class_unregister(&iscsi_connection_class);
4839         transport_class_unregister(&iscsi_session_class);
4840         transport_class_unregister(&iscsi_host_class);
4841         class_unregister(&iscsi_endpoint_class);
4842         class_unregister(&iscsi_iface_class);
4843         class_unregister(&iscsi_transport_class);
4844 }
4845
4846 module_init(iscsi_transport_init);
4847 module_exit(iscsi_transport_exit);
4848
4849 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4850               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4851               "Alex Aizman <itn780@yahoo.com>");
4852 MODULE_DESCRIPTION("iSCSI Transport Interface");
4853 MODULE_LICENSE("GPL");
4854 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4855 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);