drivers/scsi/scsi_transport_iscsi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * iSCSI transport class definitions
   4  *
   5  * Copyright (C) IBM Corporation, 2004
   6  * Copyright (C) Mike Christie, 2004 - 2005
   7  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   8  * Copyright (C) Alex Aizman, 2004 - 2005
   9  */
  10 #include <linux/module.h>
  11 #include <linux/mutex.h>
  12 #include <linux/slab.h>
  13 #include <linux/bsg-lib.h>
  14 #include <linux/idr.h>
  15 #include <net/tcp.h>
  16 #include <scsi/scsi.h>
  17 #include <scsi/scsi_host.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_transport.h>
  20 #include <scsi/scsi_transport_iscsi.h>
  21 #include <scsi/iscsi_if.h>
  22 #include <scsi/scsi_cmnd.h>
  23 #include <scsi/scsi_bsg_iscsi.h>
  24
  25 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  26
  27 #define ISCSI_SEND_MAX_ALLOWED  10
  28
  29 #define CREATE_TRACE_POINTS
  30 #include <trace/events/iscsi.h>
  31
  32 /*
  33  * Export tracepoint symbols to be used by other modules.
  34  */
  35 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
  36 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
  37 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
  38 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
  39 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
  40
  41 static int dbg_session;
  42 module_param_named(debug_session, dbg_session, int,
  43                    S_IRUGO | S_IWUSR);
  44 MODULE_PARM_DESC(debug_session,
  45                  "Turn on debugging for sessions in scsi_transport_iscsi "
  46                  "module. Set to 1 to turn on, and zero to turn off. Default "
  47                  "is off.");
  48
  49 static int dbg_conn;
  50 module_param_named(debug_conn, dbg_conn, int,
  51                    S_IRUGO | S_IWUSR);
  52 MODULE_PARM_DESC(debug_conn,
  53                  "Turn on debugging for connections in scsi_transport_iscsi "
  54                  "module. Set to 1 to turn on, and zero to turn off. Default "
  55                  "is off.");
  56
  57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  58         do {                                                            \
  59                 if (dbg_session)                                        \
  60                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  61                                                  "%s: " dbg_fmt,        \
  62                                                  __func__, ##arg);      \
  63                 iscsi_dbg_trace(trace_iscsi_dbg_trans_session,          \
  64                                 &(_session)->dev,                       \
  65                                 "%s " dbg_fmt, __func__, ##arg);        \
  66         } while (0);
  67
  68 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  69         do {                                                            \
  70                 if (dbg_conn)                                           \
  71                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  72                                               "%s: " dbg_fmt,           \
  73                                               __func__, ##arg);         \
  74                 iscsi_dbg_trace(trace_iscsi_dbg_trans_conn,             \
  75                                 &(_conn)->dev,                          \
  76                                 "%s " dbg_fmt, __func__, ##arg);        \
  77         } while (0);
  78
  79 struct iscsi_internal {
  80         struct scsi_transport_template t;
  81         struct iscsi_transport *iscsi_transport;
  82         struct list_head list;
  83         struct device dev;
  84
  85         struct transport_container conn_cont;
  86         struct transport_container session_cont;
  87 };
  88
  89 static DEFINE_IDR(iscsi_ep_idr);
  90 static DEFINE_MUTEX(iscsi_ep_idr_mutex);
  91
  92 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  93
  94 static struct workqueue_struct *iscsi_conn_cleanup_workq;
  95
  96 static DEFINE_IDA(iscsi_sess_ida);
  97 /*
  98  * list of registered transports and lock that must
  99  * be held while accessing list. The iscsi_transport_lock must
 100  * be acquired after the rx_queue_mutex.
 101  */
 102 static LIST_HEAD(iscsi_transports);
 103 static DEFINE_SPINLOCK(iscsi_transport_lock);
 104
 105 #define to_iscsi_internal(tmpl) \
 106         container_of(tmpl, struct iscsi_internal, t)
 107
 108 #define dev_to_iscsi_internal(_dev) \
 109         container_of(_dev, struct iscsi_internal, dev)
 110
 111 static void iscsi_transport_release(struct device *dev)
 112 {
 113         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 114         kfree(priv);
 115 }
 116
 117 /*
 118  * iscsi_transport_class represents the iscsi_transports that are
 119  * registered.
 120  */
 121 static struct class iscsi_transport_class = {
 122         .name = "iscsi_transport",
 123         .dev_release = iscsi_transport_release,
 124 };
 125
 126 static ssize_t
 127 show_transport_handle(struct device *dev, struct device_attribute *attr,
 128                       char *buf)
 129 {
 130         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 131
 132         if (!capable(CAP_SYS_ADMIN))
 133                 return -EACCES;
 134         return sysfs_emit(buf, "%llu\n",
 135                   (unsigned long long)iscsi_handle(priv->iscsi_transport));
 136 }
 137 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 138
 139 #define show_transport_attr(name, format)                               \
 140 static ssize_t                                                          \
 141 show_transport_##name(struct device *dev,                               \
 142                       struct device_attribute *attr,char *buf)          \
 143 {                                                                       \
 144         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 145         return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
 146 }                                                                       \
 147 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 148
 149 show_transport_attr(caps, "0x%x");
 150
 151 static struct attribute *iscsi_transport_attrs[] = {
 152         &dev_attr_handle.attr,
 153         &dev_attr_caps.attr,
 154         NULL,
 155 };
 156
 157 static struct attribute_group iscsi_transport_group = {
 158         .attrs = iscsi_transport_attrs,
 159 };
 160
 161 /*
 162  * iSCSI endpoint attrs
 163  */
 164 #define iscsi_dev_to_endpoint(_dev) \
 165         container_of(_dev, struct iscsi_endpoint, dev)
 166
 167 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 168 struct device_attribute dev_attr_##_prefix##_##_name =  \
 169         __ATTR(_name,_mode,_show,_store)
 170
 171 static void iscsi_endpoint_release(struct device *dev)
 172 {
 173         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 174
 175         mutex_lock(&iscsi_ep_idr_mutex);
 176         idr_remove(&iscsi_ep_idr, ep->id);
 177         mutex_unlock(&iscsi_ep_idr_mutex);
 178
 179         kfree(ep);
 180 }
 181
 182 static struct class iscsi_endpoint_class = {
 183         .name = "iscsi_endpoint",
 184         .dev_release = iscsi_endpoint_release,
 185 };
 186
 187 static ssize_t
 188 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 189 {
 190         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 191         return sysfs_emit(buf, "%d\n", ep->id);
 192 }
 193 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 194
 195 static struct attribute *iscsi_endpoint_attrs[] = {
 196         &dev_attr_ep_handle.attr,
 197         NULL,
 198 };
 199
 200 static struct attribute_group iscsi_endpoint_group = {
 201         .attrs = iscsi_endpoint_attrs,
 202 };
 203
 204 struct iscsi_endpoint *
 205 iscsi_create_endpoint(int dd_size)
 206 {
 207         struct iscsi_endpoint *ep;
 208         int err, id;
 209
 210         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 211         if (!ep)
 212                 return NULL;
 213
 214         mutex_lock(&iscsi_ep_idr_mutex);
 215
 216         /*
 217          * First endpoint id should be 1 to comply with user space
 218          * applications (iscsid).
 219          */
 220         id = idr_alloc(&iscsi_ep_idr, ep, 1, -1, GFP_NOIO);
 221         if (id < 0) {
 222                 mutex_unlock(&iscsi_ep_idr_mutex);
 223                 printk(KERN_ERR "Could not allocate endpoint ID. Error %d.\n",
 224                        id);
 225                 goto free_ep;
 226         }
 227         mutex_unlock(&iscsi_ep_idr_mutex);
 228
 229         ep->id = id;
 230         ep->dev.class = &iscsi_endpoint_class;
 231         dev_set_name(&ep->dev, "ep-%d", id);
 232         err = device_register(&ep->dev);
 233         if (err)
 234                 goto put_dev;
 235
 236         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 237         if (err)
 238                 goto unregister_dev;
 239
 240         if (dd_size)
 241                 ep->dd_data = &ep[1];
 242         return ep;
 243
 244 unregister_dev:
 245         device_unregister(&ep->dev);
 246         return NULL;
 247
 248 put_dev:
 249         mutex_lock(&iscsi_ep_idr_mutex);
 250         idr_remove(&iscsi_ep_idr, id);
 251         mutex_unlock(&iscsi_ep_idr_mutex);
 252         put_device(&ep->dev);
 253         return NULL;
 254 free_ep:
 255         kfree(ep);
 256         return NULL;
 257 }
 258 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 259
 260 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 261 {
 262         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 263         device_unregister(&ep->dev);
 264 }
 265 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 266
 267 void iscsi_put_endpoint(struct iscsi_endpoint *ep)
 268 {
 269         put_device(&ep->dev);
 270 }
 271 EXPORT_SYMBOL_GPL(iscsi_put_endpoint);
 272
 273 /**
 274  * iscsi_lookup_endpoint - get ep from handle
 275  * @handle: endpoint handle
 276  *
 277  * Caller must do a iscsi_put_endpoint.
 278  */
 279 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 280 {
 281         struct iscsi_endpoint *ep;
 282
 283         mutex_lock(&iscsi_ep_idr_mutex);
 284         ep = idr_find(&iscsi_ep_idr, handle);
 285         if (!ep)
 286                 goto unlock;
 287
 288         get_device(&ep->dev);
 289 unlock:
 290         mutex_unlock(&iscsi_ep_idr_mutex);
 291         return ep;
 292 }
 293 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 294
 295 /*
 296  * Interface to display network param to sysfs
 297  */
 298
 299 static void iscsi_iface_release(struct device *dev)
 300 {
 301         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 302         struct device *parent = iface->dev.parent;
 303
 304         kfree(iface);
 305         put_device(parent);
 306 }
 307
 308
 309 static struct class iscsi_iface_class = {
 310         .name = "iscsi_iface",
 311         .dev_release = iscsi_iface_release,
 312 };
 313
 314 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 315 struct device_attribute dev_attr_##_prefix##_##_name =          \
 316         __ATTR(_name, _mode, _show, _store)
 317
 318 /* iface attrs show */
 319 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 320 static ssize_t                                                          \
 321 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 322                      char *buf)                                         \
 323 {                                                                       \
 324         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 325         struct iscsi_transport *t = iface->transport;                   \
 326         return t->get_iface_param(iface, param_type, param, buf);       \
 327 }                                                                       \
 328
 329 #define iscsi_iface_net_attr(type, name, param)                         \
 330         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 331 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 332
 333 #define iscsi_iface_attr(type, name, param)                             \
 334         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 335 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 336
 337 /* generic read only ipv4 attribute */
 338 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 339 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 340 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 341 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 342 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 343                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 344 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 345                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 346 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 347 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 348 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 349                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 350 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 351                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 352 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 353                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 354 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 355                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 356 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 357                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 358 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 359                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 360 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 361                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 362 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 363                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 364 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 365                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 366 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 367
 368 /* generic read only ipv6 attribute */
 369 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 370 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 371                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 372 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 373 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 374                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 375 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 376                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 377 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 378                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 379 iscsi_iface_net_attr(ipv6_iface, router_state,
 380                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 381 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 382                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 383 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 384 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 385 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 386                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 387 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 388 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 389                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 390 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 391                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 392 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 393                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 394 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 395                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 396 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 397                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 398
 399 /* common read only iface attribute */
 400 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 401 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 402 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 403 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 404 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 405 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 406 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 407 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 408 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 409                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 410 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 411 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 412 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 413 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 414 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 415 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 416
 417 /* common iscsi specific settings attributes */
 418 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 419 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 420 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 421 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 422 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 423 iscsi_iface_attr(iface, data_seq_in_order,
 424                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 425 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 426 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 427 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 428 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 429 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 430 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 431 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 432 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 433 iscsi_iface_attr(iface, discovery_auth_optional,
 434                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 435 iscsi_iface_attr(iface, discovery_logout,
 436                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 437 iscsi_iface_attr(iface, strict_login_comp_en,
 438                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 439 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 440
 441 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 442                                           struct attribute *attr, int i)
 443 {
 444         struct device *dev = container_of(kobj, struct device, kobj);
 445         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 446         struct iscsi_transport *t = iface->transport;
 447         int param = -1;
 448
 449         if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 450                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 451         else if (attr == &dev_attr_iface_header_digest.attr)
 452                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 453         else if (attr == &dev_attr_iface_data_digest.attr)
 454                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 455         else if (attr == &dev_attr_iface_immediate_data.attr)
 456                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 457         else if (attr == &dev_attr_iface_initial_r2t.attr)
 458                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 459         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 460                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 461         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 462                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 463         else if (attr == &dev_attr_iface_erl.attr)
 464                 param = ISCSI_IFACE_PARAM_ERL;
 465         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 466                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 467         else if (attr == &dev_attr_iface_first_burst_len.attr)
 468                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 469         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 470                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 471         else if (attr == &dev_attr_iface_max_burst_len.attr)
 472                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 473         else if (attr == &dev_attr_iface_chap_auth.attr)
 474                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 475         else if (attr == &dev_attr_iface_bidi_chap.attr)
 476                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 477         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 478                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 479         else if (attr == &dev_attr_iface_discovery_logout.attr)
 480                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 481         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 482                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 483         else if (attr == &dev_attr_iface_initiator_name.attr)
 484                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 485
 486         if (param != -1)
 487                 return t->attr_is_visible(ISCSI_IFACE_PARAM, param);
 488
 489         if (attr == &dev_attr_iface_enabled.attr)
 490                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 491         else if (attr == &dev_attr_iface_vlan_id.attr)
 492                 param = ISCSI_NET_PARAM_VLAN_ID;
 493         else if (attr == &dev_attr_iface_vlan_priority.attr)
 494                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 495         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 496                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 497         else if (attr == &dev_attr_iface_mtu.attr)
 498                 param = ISCSI_NET_PARAM_MTU;
 499         else if (attr == &dev_attr_iface_port.attr)
 500                 param = ISCSI_NET_PARAM_PORT;
 501         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 502                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 503         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 504                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 505         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 506                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 507         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 508                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 509         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 510                 param = ISCSI_NET_PARAM_TCP_WSF;
 511         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 512                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 513         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 514                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 515         else if (attr == &dev_attr_iface_cache_id.attr)
 516                 param = ISCSI_NET_PARAM_CACHE_ID;
 517         else if (attr == &dev_attr_iface_redirect_en.attr)
 518                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 519         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 520                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 521                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 522                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 523                         param = ISCSI_NET_PARAM_IPV4_GW;
 524                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 525                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 526                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 527                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 528                 else if (attr ==
 529                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 530                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 531                 else if (attr ==
 532                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 533                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 534                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 535                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 536                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 537                         param = ISCSI_NET_PARAM_IPV4_TOS;
 538                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 539                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 540                 else if (attr ==
 541                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 542                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 543                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 544                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 545                 else if (attr ==
 546                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 547                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 548                 else if (attr ==
 549                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 550                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 551                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 552                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 553                 else if (attr ==
 554                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 555                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 556                 else if (attr ==
 557                          &dev_attr_ipv4_iface_fragment_disable.attr)
 558                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 559                 else if (attr ==
 560                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 561                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 562                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 563                         param = ISCSI_NET_PARAM_IPV4_TTL;
 564                 else
 565                         return 0;
 566         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 567                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 568                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 569                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 570                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 571                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 572                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 573                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 574                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 575                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 576                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 577                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 578                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 579                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 580                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 581                 else if (attr ==
 582                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 583                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 584                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 585                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 586                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 587                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 588                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 589                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 590                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 591                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 592                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 593                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 594                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 595                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 596                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 597                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 598                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 599                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 600                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 601                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 602                 else
 603                         return 0;
 604         } else {
 605                 WARN_ONCE(1, "Invalid iface attr");
 606                 return 0;
 607         }
 608
 609         return t->attr_is_visible(ISCSI_NET_PARAM, param);
 610 }
 611
 612 static struct attribute *iscsi_iface_attrs[] = {
 613         &dev_attr_iface_enabled.attr,
 614         &dev_attr_iface_vlan_id.attr,
 615         &dev_attr_iface_vlan_priority.attr,
 616         &dev_attr_iface_vlan_enabled.attr,
 617         &dev_attr_ipv4_iface_ipaddress.attr,
 618         &dev_attr_ipv4_iface_gateway.attr,
 619         &dev_attr_ipv4_iface_subnet.attr,
 620         &dev_attr_ipv4_iface_bootproto.attr,
 621         &dev_attr_ipv6_iface_ipaddress.attr,
 622         &dev_attr_ipv6_iface_link_local_addr.attr,
 623         &dev_attr_ipv6_iface_router_addr.attr,
 624         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 625         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 626         &dev_attr_iface_mtu.attr,
 627         &dev_attr_iface_port.attr,
 628         &dev_attr_iface_ipaddress_state.attr,
 629         &dev_attr_iface_delayed_ack_en.attr,
 630         &dev_attr_iface_tcp_nagle_disable.attr,
 631         &dev_attr_iface_tcp_wsf_disable.attr,
 632         &dev_attr_iface_tcp_wsf.attr,
 633         &dev_attr_iface_tcp_timer_scale.attr,
 634         &dev_attr_iface_tcp_timestamp_en.attr,
 635         &dev_attr_iface_cache_id.attr,
 636         &dev_attr_iface_redirect_en.attr,
 637         &dev_attr_iface_def_taskmgmt_tmo.attr,
 638         &dev_attr_iface_header_digest.attr,
 639         &dev_attr_iface_data_digest.attr,
 640         &dev_attr_iface_immediate_data.attr,
 641         &dev_attr_iface_initial_r2t.attr,
 642         &dev_attr_iface_data_seq_in_order.attr,
 643         &dev_attr_iface_data_pdu_in_order.attr,
 644         &dev_attr_iface_erl.attr,
 645         &dev_attr_iface_max_recv_dlength.attr,
 646         &dev_attr_iface_first_burst_len.attr,
 647         &dev_attr_iface_max_outstanding_r2t.attr,
 648         &dev_attr_iface_max_burst_len.attr,
 649         &dev_attr_iface_chap_auth.attr,
 650         &dev_attr_iface_bidi_chap.attr,
 651         &dev_attr_iface_discovery_auth_optional.attr,
 652         &dev_attr_iface_discovery_logout.attr,
 653         &dev_attr_iface_strict_login_comp_en.attr,
 654         &dev_attr_iface_initiator_name.attr,
 655         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 656         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 657         &dev_attr_ipv4_iface_tos_en.attr,
 658         &dev_attr_ipv4_iface_tos.attr,
 659         &dev_attr_ipv4_iface_grat_arp_en.attr,
 660         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 661         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 662         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 663         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 664         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 665         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 666         &dev_attr_ipv4_iface_fragment_disable.attr,
 667         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 668         &dev_attr_ipv4_iface_ttl.attr,
 669         &dev_attr_ipv6_iface_link_local_state.attr,
 670         &dev_attr_ipv6_iface_router_state.attr,
 671         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 672         &dev_attr_ipv6_iface_mld_en.attr,
 673         &dev_attr_ipv6_iface_flow_label.attr,
 674         &dev_attr_ipv6_iface_traffic_class.attr,
 675         &dev_attr_ipv6_iface_hop_limit.attr,
 676         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 677         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 678         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 679         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 680         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 681         NULL,
 682 };
 683
 684 static struct attribute_group iscsi_iface_group = {
 685         .attrs = iscsi_iface_attrs,
 686         .is_visible = iscsi_iface_attr_is_visible,
 687 };
 688
 689 /* convert iscsi_ipaddress_state values to ascii string name */
 690 static const struct {
 691         enum iscsi_ipaddress_state      value;
 692         char                            *name;
 693 } iscsi_ipaddress_state_names[] = {
 694         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 695         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 696         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 697         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 698         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 699         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 700         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 701 };
 702
 703 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 704 {
 705         int i;
 706         char *state = NULL;
 707
 708         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 709                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 710                         state = iscsi_ipaddress_state_names[i].name;
 711                         break;
 712                 }
 713         }
 714         return state;
 715 }
 716 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 717
 718 /* convert iscsi_router_state values to ascii string name */
 719 static const struct {
 720         enum iscsi_router_state value;
 721         char                    *name;
 722 } iscsi_router_state_names[] = {
 723         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 724         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 725         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 726         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 727 };
 728
 729 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 730 {
 731         int i;
 732         char *state = NULL;
 733
 734         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 735                 if (iscsi_router_state_names[i].value == router_state) {
 736                         state = iscsi_router_state_names[i].name;
 737                         break;
 738                 }
 739         }
 740         return state;
 741 }
 742 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 743
 744 struct iscsi_iface *
 745 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 746                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 747 {
 748         struct iscsi_iface *iface;
 749         int err;
 750
 751         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 752         if (!iface)
 753                 return NULL;
 754
 755         iface->transport = transport;
 756         iface->iface_type = iface_type;
 757         iface->iface_num = iface_num;
 758         iface->dev.release = iscsi_iface_release;
 759         iface->dev.class = &iscsi_iface_class;
 760         /* parent reference released in iscsi_iface_release */
 761         iface->dev.parent = get_device(&shost->shost_gendev);
 762         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 763                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 764                              iface_num);
 765         else
 766                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 767                              iface_num);
 768
 769         err = device_register(&iface->dev);
 770         if (err)
 771                 goto put_dev;
 772
 773         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 774         if (err)
 775                 goto unreg_iface;
 776
 777         if (dd_size)
 778                 iface->dd_data = &iface[1];
 779         return iface;
 780
 781 unreg_iface:
 782         device_unregister(&iface->dev);
 783         return NULL;
 784
 785 put_dev:
 786         put_device(&iface->dev);
 787         return NULL;
 788 }
 789 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 790
 791 void iscsi_destroy_iface(struct iscsi_iface *iface)
 792 {
 793         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 794         device_unregister(&iface->dev);
 795 }
 796 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 797
 798 /*
 799  * Interface to display flash node params to sysfs
 800  */
 801
 802 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 803 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 804         __ATTR(_name, _mode, _show, _store)
 805
 806 /* flash node session attrs show */
 807 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 808 static ssize_t                                                          \
 809 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 810                      char *buf)                                         \
 811 {                                                                       \
 812         struct iscsi_bus_flash_session *fnode_sess =                    \
 813                                         iscsi_dev_to_flash_session(dev);\
 814         struct iscsi_transport *t = fnode_sess->transport;              \
 815         return t->get_flashnode_param(fnode_sess, param, buf);          \
 816 }                                                                       \
 817
 818
 819 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 820         iscsi_flashnode_sess_attr_show(type, name, param)               \
 821 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 822                             show_##type##_##name, NULL);
 823
 824 /* Flash node session attributes */
 825
 826 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 827                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 828 iscsi_flashnode_sess_attr(fnode, discovery_session,
 829                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 830 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 831 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 832 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 833 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 834 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 835                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 836 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 837                           ISCSI_FLASHNODE_PDU_INORDER);
 838 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 839 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 840                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 841 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 842 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 843                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 844 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 845 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 846 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 847 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 848                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 849 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 850 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 851 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 852 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 853 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 854                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 855 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 856 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 857 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 858 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 859                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 860 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 861                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 862 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 863 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 864 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 865 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 866 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 867 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 868 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 869
 870 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 871         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 872         &dev_attr_fnode_discovery_session.attr,
 873         &dev_attr_fnode_portal_type.attr,
 874         &dev_attr_fnode_entry_enable.attr,
 875         &dev_attr_fnode_immediate_data.attr,
 876         &dev_attr_fnode_initial_r2t.attr,
 877         &dev_attr_fnode_data_seq_in_order.attr,
 878         &dev_attr_fnode_data_pdu_in_order.attr,
 879         &dev_attr_fnode_chap_auth.attr,
 880         &dev_attr_fnode_discovery_logout.attr,
 881         &dev_attr_fnode_bidi_chap.attr,
 882         &dev_attr_fnode_discovery_auth_optional.attr,
 883         &dev_attr_fnode_erl.attr,
 884         &dev_attr_fnode_first_burst_len.attr,
 885         &dev_attr_fnode_def_time2wait.attr,
 886         &dev_attr_fnode_def_time2retain.attr,
 887         &dev_attr_fnode_max_outstanding_r2t.attr,
 888         &dev_attr_fnode_isid.attr,
 889         &dev_attr_fnode_tsid.attr,
 890         &dev_attr_fnode_max_burst_len.attr,
 891         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 892         &dev_attr_fnode_targetalias.attr,
 893         &dev_attr_fnode_targetname.attr,
 894         &dev_attr_fnode_tpgt.attr,
 895         &dev_attr_fnode_discovery_parent_idx.attr,
 896         &dev_attr_fnode_discovery_parent_type.attr,
 897         &dev_attr_fnode_chap_in_idx.attr,
 898         &dev_attr_fnode_chap_out_idx.attr,
 899         &dev_attr_fnode_username.attr,
 900         &dev_attr_fnode_username_in.attr,
 901         &dev_attr_fnode_password.attr,
 902         &dev_attr_fnode_password_in.attr,
 903         &dev_attr_fnode_is_boot_target.attr,
 904         NULL,
 905 };
 906
 907 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 908                                                     struct attribute *attr,
 909                                                     int i)
 910 {
 911         struct device *dev = container_of(kobj, struct device, kobj);
 912         struct iscsi_bus_flash_session *fnode_sess =
 913                                                 iscsi_dev_to_flash_session(dev);
 914         struct iscsi_transport *t = fnode_sess->transport;
 915         int param;
 916
 917         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 918                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 919         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 920                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 921         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 922                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 923         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 924                 param = ISCSI_FLASHNODE_ENTRY_EN;
 925         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 926                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 927         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 928                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 929         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 930                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 931         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 932                 param = ISCSI_FLASHNODE_PDU_INORDER;
 933         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 934                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 935         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 936                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 937         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 938                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 939         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 940                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 941         } else if (attr == &dev_attr_fnode_erl.attr) {
 942                 param = ISCSI_FLASHNODE_ERL;
 943         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 944                 param = ISCSI_FLASHNODE_FIRST_BURST;
 945         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 946                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 947         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 948                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 949         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 950                 param = ISCSI_FLASHNODE_MAX_R2T;
 951         } else if (attr == &dev_attr_fnode_isid.attr) {
 952                 param = ISCSI_FLASHNODE_ISID;
 953         } else if (attr == &dev_attr_fnode_tsid.attr) {
 954                 param = ISCSI_FLASHNODE_TSID;
 955         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 956                 param = ISCSI_FLASHNODE_MAX_BURST;
 957         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 958                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 959         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 960                 param = ISCSI_FLASHNODE_ALIAS;
 961         } else if (attr == &dev_attr_fnode_targetname.attr) {
 962                 param = ISCSI_FLASHNODE_NAME;
 963         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 964                 param = ISCSI_FLASHNODE_TPGT;
 965         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 966                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 967         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 968                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 969         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 970                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 971         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 972                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 973         } else if (attr == &dev_attr_fnode_username.attr) {
 974                 param = ISCSI_FLASHNODE_USERNAME;
 975         } else if (attr == &dev_attr_fnode_username_in.attr) {
 976                 param = ISCSI_FLASHNODE_USERNAME_IN;
 977         } else if (attr == &dev_attr_fnode_password.attr) {
 978                 param = ISCSI_FLASHNODE_PASSWORD;
 979         } else if (attr == &dev_attr_fnode_password_in.attr) {
 980                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 981         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 982                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 983         } else {
 984                 WARN_ONCE(1, "Invalid flashnode session attr");
 985                 return 0;
 986         }
 987
 988         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 989 }
 990
 991 static struct attribute_group iscsi_flashnode_sess_attr_group = {
 992         .attrs = iscsi_flashnode_sess_attrs,
 993         .is_visible = iscsi_flashnode_sess_attr_is_visible,
 994 };
 995
 996 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
 997         &iscsi_flashnode_sess_attr_group,
 998         NULL,
 999 };
1000
1001 static void iscsi_flashnode_sess_release(struct device *dev)
1002 {
1003         struct iscsi_bus_flash_session *fnode_sess =
1004                                                 iscsi_dev_to_flash_session(dev);
1005
1006         kfree(fnode_sess->targetname);
1007         kfree(fnode_sess->targetalias);
1008         kfree(fnode_sess->portal_type);
1009         kfree(fnode_sess);
1010 }
1011
1012 static const struct device_type iscsi_flashnode_sess_dev_type = {
1013         .name = "iscsi_flashnode_sess_dev_type",
1014         .groups = iscsi_flashnode_sess_attr_groups,
1015         .release = iscsi_flashnode_sess_release,
1016 };
1017
1018 /* flash node connection attrs show */
1019 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1020 static ssize_t                                                          \
1021 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1022                      char *buf)                                         \
1023 {                                                                       \
1024         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1025         struct iscsi_bus_flash_session *fnode_sess =                    \
1026                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1027         struct iscsi_transport *t = fnode_conn->transport;              \
1028         return t->get_flashnode_param(fnode_sess, param, buf);          \
1029 }                                                                       \
1030
1031
1032 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1033         iscsi_flashnode_conn_attr_show(type, name, param)               \
1034 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1035                             show_##type##_##name, NULL);
1036
1037 /* Flash node connection attributes */
1038
1039 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1040                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1041 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1042 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1043 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1044 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1045                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1046 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1047                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1048 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1049                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1050 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1051                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1052 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1053                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1054 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1055                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1056 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1057 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1058 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1059 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1060                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1061 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1062                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1063 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1064 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1065 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1066 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1067                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1068 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1069                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1070 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1071                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1072 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1073                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1074 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1075 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1076 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1077 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1078
1079 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1080         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1081         &dev_attr_fnode_header_digest.attr,
1082         &dev_attr_fnode_data_digest.attr,
1083         &dev_attr_fnode_snack_req.attr,
1084         &dev_attr_fnode_tcp_timestamp_stat.attr,
1085         &dev_attr_fnode_tcp_nagle_disable.attr,
1086         &dev_attr_fnode_tcp_wsf_disable.attr,
1087         &dev_attr_fnode_tcp_timer_scale.attr,
1088         &dev_attr_fnode_tcp_timestamp_enable.attr,
1089         &dev_attr_fnode_fragment_disable.attr,
1090         &dev_attr_fnode_max_recv_dlength.attr,
1091         &dev_attr_fnode_max_xmit_dlength.attr,
1092         &dev_attr_fnode_keepalive_tmo.attr,
1093         &dev_attr_fnode_port.attr,
1094         &dev_attr_fnode_ipaddress.attr,
1095         &dev_attr_fnode_redirect_ipaddr.attr,
1096         &dev_attr_fnode_max_segment_size.attr,
1097         &dev_attr_fnode_local_port.attr,
1098         &dev_attr_fnode_ipv4_tos.attr,
1099         &dev_attr_fnode_ipv6_traffic_class.attr,
1100         &dev_attr_fnode_ipv6_flow_label.attr,
1101         &dev_attr_fnode_link_local_ipv6.attr,
1102         &dev_attr_fnode_tcp_xmit_wsf.attr,
1103         &dev_attr_fnode_tcp_recv_wsf.attr,
1104         &dev_attr_fnode_statsn.attr,
1105         &dev_attr_fnode_exp_statsn.attr,
1106         NULL,
1107 };
1108
1109 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1110                                                     struct attribute *attr,
1111                                                     int i)
1112 {
1113         struct device *dev = container_of(kobj, struct device, kobj);
1114         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1115         struct iscsi_transport *t = fnode_conn->transport;
1116         int param;
1117
1118         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1119                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1120         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1121                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1122         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1123                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1124         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1125                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1126         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1127                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1128         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1129                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1130         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1131                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1132         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1133                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1134         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1135                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1136         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1137                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1138         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1139                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1140         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1141                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1142         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1143                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1144         } else if (attr == &dev_attr_fnode_port.attr) {
1145                 param = ISCSI_FLASHNODE_PORT;
1146         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1147                 param = ISCSI_FLASHNODE_IPADDR;
1148         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1149                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1150         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1151                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1152         } else if (attr == &dev_attr_fnode_local_port.attr) {
1153                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1154         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1155                 param = ISCSI_FLASHNODE_IPV4_TOS;
1156         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1157                 param = ISCSI_FLASHNODE_IPV6_TC;
1158         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1159                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1160         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1161                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1162         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1163                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1164         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1165                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1166         } else if (attr == &dev_attr_fnode_statsn.attr) {
1167                 param = ISCSI_FLASHNODE_STATSN;
1168         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1169                 param = ISCSI_FLASHNODE_EXP_STATSN;
1170         } else {
1171                 WARN_ONCE(1, "Invalid flashnode connection attr");
1172                 return 0;
1173         }
1174
1175         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1176 }
1177
1178 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1179         .attrs = iscsi_flashnode_conn_attrs,
1180         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1181 };
1182
1183 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1184         &iscsi_flashnode_conn_attr_group,
1185         NULL,
1186 };
1187
1188 static void iscsi_flashnode_conn_release(struct device *dev)
1189 {
1190         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1191
1192         kfree(fnode_conn->ipaddress);
1193         kfree(fnode_conn->redirect_ipaddr);
1194         kfree(fnode_conn->link_local_ipv6_addr);
1195         kfree(fnode_conn);
1196 }
1197
1198 static const struct device_type iscsi_flashnode_conn_dev_type = {
1199         .name = "iscsi_flashnode_conn_dev_type",
1200         .groups = iscsi_flashnode_conn_attr_groups,
1201         .release = iscsi_flashnode_conn_release,
1202 };
1203
1204 static const struct bus_type iscsi_flashnode_bus;
1205
1206 int iscsi_flashnode_bus_match(struct device *dev,
1207                               const struct device_driver *drv)
1208 {
1209         if (dev->bus == &iscsi_flashnode_bus)
1210                 return 1;
1211         return 0;
1212 }
1213 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1214
1215 static const struct bus_type iscsi_flashnode_bus = {
1216         .name = "iscsi_flashnode",
1217         .match = &iscsi_flashnode_bus_match,
1218 };
1219
1220 /**
1221  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1222  * @shost: pointer to host data
1223  * @index: index of flashnode to add in sysfs
1224  * @transport: pointer to transport data
1225  * @dd_size: total size to allocate
1226  *
1227  * Adds a sysfs entry for the flashnode session attributes
1228  *
1229  * Returns:
1230  *  pointer to allocated flashnode sess on success
1231  *  %NULL on failure
1232  */
1233 struct iscsi_bus_flash_session *
1234 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1235                             struct iscsi_transport *transport,
1236                             int dd_size)
1237 {
1238         struct iscsi_bus_flash_session *fnode_sess;
1239         int err;
1240
1241         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1242         if (!fnode_sess)
1243                 return NULL;
1244
1245         fnode_sess->transport = transport;
1246         fnode_sess->target_id = index;
1247         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1248         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1249         fnode_sess->dev.parent = &shost->shost_gendev;
1250         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1251                      shost->host_no, index);
1252
1253         err = device_register(&fnode_sess->dev);
1254         if (err)
1255                 goto put_dev;
1256
1257         if (dd_size)
1258                 fnode_sess->dd_data = &fnode_sess[1];
1259
1260         return fnode_sess;
1261
1262 put_dev:
1263         put_device(&fnode_sess->dev);
1264         return NULL;
1265 }
1266 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1267
1268 /**
1269  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1270  * @shost: pointer to host data
1271  * @fnode_sess: pointer to the parent flashnode session entry
1272  * @transport: pointer to transport data
1273  * @dd_size: total size to allocate
1274  *
1275  * Adds a sysfs entry for the flashnode connection attributes
1276  *
1277  * Returns:
1278  *  pointer to allocated flashnode conn on success
1279  *  %NULL on failure
1280  */
1281 struct iscsi_bus_flash_conn *
1282 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1283                             struct iscsi_bus_flash_session *fnode_sess,
1284                             struct iscsi_transport *transport,
1285                             int dd_size)
1286 {
1287         struct iscsi_bus_flash_conn *fnode_conn;
1288         int err;
1289
1290         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1291         if (!fnode_conn)
1292                 return NULL;
1293
1294         fnode_conn->transport = transport;
1295         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1296         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1297         fnode_conn->dev.parent = &fnode_sess->dev;
1298         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1299                      shost->host_no, fnode_sess->target_id);
1300
1301         err = device_register(&fnode_conn->dev);
1302         if (err)
1303                 goto put_dev;
1304
1305         if (dd_size)
1306                 fnode_conn->dd_data = &fnode_conn[1];
1307
1308         return fnode_conn;
1309
1310 put_dev:
1311         put_device(&fnode_conn->dev);
1312         return NULL;
1313 }
1314 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1315
1316 /**
1317  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1318  * @dev: device to verify
1319  * @data: pointer to data containing value to use for verification
1320  *
1321  * Verifies if the passed device is flashnode conn device
1322  *
1323  * Returns:
1324  *  1 on success
1325  *  0 on failure
1326  */
1327 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1328 {
1329         return dev->bus == &iscsi_flashnode_bus;
1330 }
1331
1332 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1333 {
1334         device_unregister(&fnode_conn->dev);
1335         return 0;
1336 }
1337
1338 static int flashnode_match_index(struct device *dev, void *data)
1339 {
1340         struct iscsi_bus_flash_session *fnode_sess = NULL;
1341         int ret = 0;
1342
1343         if (!iscsi_flashnode_bus_match(dev, NULL))
1344                 goto exit_match_index;
1345
1346         fnode_sess = iscsi_dev_to_flash_session(dev);
1347         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1348
1349 exit_match_index:
1350         return ret;
1351 }
1352
1353 /**
1354  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1355  * @shost: pointer to host data
1356  * @idx: index to match
1357  *
1358  * Finds the flashnode session object for the passed index
1359  *
1360  * Returns:
1361  *  pointer to found flashnode session object on success
1362  *  %NULL on failure
1363  */
1364 static struct iscsi_bus_flash_session *
1365 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1366 {
1367         struct iscsi_bus_flash_session *fnode_sess = NULL;
1368         struct device *dev;
1369
1370         dev = device_find_child(&shost->shost_gendev, &idx,
1371                                 flashnode_match_index);
1372         if (dev)
1373                 fnode_sess = iscsi_dev_to_flash_session(dev);
1374
1375         return fnode_sess;
1376 }
1377
1378 /**
1379  * iscsi_find_flashnode_sess - finds flashnode session entry
1380  * @shost: pointer to host data
1381  * @data: pointer to data containing value to use for comparison
1382  * @fn: function pointer that does actual comparison
1383  *
1384  * Finds the flashnode session object comparing the data passed using logic
1385  * defined in passed function pointer
1386  *
1387  * Returns:
1388  *  pointer to found flashnode session device object on success
1389  *  %NULL on failure
1390  */
1391 struct device *
1392 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1393                           int (*fn)(struct device *dev, void *data))
1394 {
1395         return device_find_child(&shost->shost_gendev, data, fn);
1396 }
1397 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1398
1399 /**
1400  * iscsi_find_flashnode_conn - finds flashnode connection entry
1401  * @fnode_sess: pointer to parent flashnode session entry
1402  *
1403  * Finds the flashnode connection object comparing the data passed using logic
1404  * defined in passed function pointer
1405  *
1406  * Returns:
1407  *  pointer to found flashnode connection device object on success
1408  *  %NULL on failure
1409  */
1410 struct device *
1411 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1412 {
1413         return device_find_child(&fnode_sess->dev, NULL,
1414                                  iscsi_is_flashnode_conn_dev);
1415 }
1416 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1417
1418 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1419 {
1420         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1421                 return 0;
1422
1423         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1424 }
1425
1426 /**
1427  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1428  * @fnode_sess: pointer to flashnode session entry to be destroyed
1429  *
1430  * Deletes the flashnode session entry and all children flashnode connection
1431  * entries from sysfs
1432  */
1433 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1434 {
1435         int err;
1436
1437         err = device_for_each_child(&fnode_sess->dev, NULL,
1438                                     iscsi_iter_destroy_flashnode_conn_fn);
1439         if (err)
1440                 pr_err("Could not delete all connections for %s. Error %d.\n",
1441                        fnode_sess->dev.kobj.name, err);
1442
1443         device_unregister(&fnode_sess->dev);
1444 }
1445 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1446
1447 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1448 {
1449         if (!iscsi_flashnode_bus_match(dev, NULL))
1450                 return 0;
1451
1452         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1453         return 0;
1454 }
1455
1456 /**
1457  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1458  * @shost: pointer to host data
1459  *
1460  * Destroys all the flashnode session entries and all corresponding children
1461  * flashnode connection entries from sysfs
1462  */
1463 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1464 {
1465         device_for_each_child(&shost->shost_gendev, NULL,
1466                               iscsi_iter_destroy_flashnode_fn);
1467 }
1468 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1469
1470 /*
1471  * BSG support
1472  */
1473 /**
1474  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1475  * @job: bsg job to be processed
1476  */
1477 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1478 {
1479         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1480         struct iscsi_bsg_request *req = job->request;
1481         struct iscsi_bsg_reply *reply = job->reply;
1482         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1483         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1484         int ret;
1485
1486         /* check if we have the msgcode value at least */
1487         if (job->request_len < sizeof(uint32_t)) {
1488                 ret = -ENOMSG;
1489                 goto fail_host_msg;
1490         }
1491
1492         /* Validate the host command */
1493         switch (req->msgcode) {
1494         case ISCSI_BSG_HST_VENDOR:
1495                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1496                 if ((shost->hostt->vendor_id == 0L) ||
1497                     (req->rqst_data.h_vendor.vendor_id !=
1498                         shost->hostt->vendor_id)) {
1499                         ret = -ESRCH;
1500                         goto fail_host_msg;
1501                 }
1502                 break;
1503         default:
1504                 ret = -EBADR;
1505                 goto fail_host_msg;
1506         }
1507
1508         /* check if we really have all the request data needed */
1509         if (job->request_len < cmdlen) {
1510                 ret = -ENOMSG;
1511                 goto fail_host_msg;
1512         }
1513
1514         ret = i->iscsi_transport->bsg_request(job);
1515         if (!ret)
1516                 return 0;
1517
1518 fail_host_msg:
1519         /* return the errno failure code as the only status */
1520         BUG_ON(job->reply_len < sizeof(uint32_t));
1521         reply->reply_payload_rcv_len = 0;
1522         reply->result = ret;
1523         job->reply_len = sizeof(uint32_t);
1524         bsg_job_done(job, ret, 0);
1525         return 0;
1526 }
1527
1528 /**
1529  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1530  * @shost: shost for iscsi_host
1531  * @ihost: iscsi_cls_host adding the structures to
1532  */
1533 static int
1534 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1535 {
1536         struct device *dev = &shost->shost_gendev;
1537         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1538         struct queue_limits lim;
1539         struct request_queue *q;
1540         char bsg_name[20];
1541
1542         if (!i->iscsi_transport->bsg_request)
1543                 return -ENOTSUPP;
1544
1545         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1546         scsi_init_limits(shost, &lim);
1547         q = bsg_setup_queue(dev, bsg_name, &lim, iscsi_bsg_host_dispatch, NULL,
1548                         0);
1549         if (IS_ERR(q)) {
1550                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1551                              "initialize - no request queue\n");
1552                 return PTR_ERR(q);
1553         }
1554
1555         ihost->bsg_q = q;
1556         return 0;
1557 }
1558
1559 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1560                             struct device *cdev)
1561 {
1562         struct Scsi_Host *shost = dev_to_shost(dev);
1563         struct iscsi_cls_host *ihost = shost->shost_data;
1564
1565         memset(ihost, 0, sizeof(*ihost));
1566         mutex_init(&ihost->mutex);
1567
1568         iscsi_bsg_host_add(shost, ihost);
1569         /* ignore any bsg add error - we just can't do sgio */
1570
1571         return 0;
1572 }
1573
1574 static int iscsi_remove_host(struct transport_container *tc,
1575                              struct device *dev, struct device *cdev)
1576 {
1577         struct Scsi_Host *shost = dev_to_shost(dev);
1578         struct iscsi_cls_host *ihost = shost->shost_data;
1579
1580         bsg_remove_queue(ihost->bsg_q);
1581         return 0;
1582 }
1583
1584 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1585                                "iscsi_host",
1586                                iscsi_setup_host,
1587                                iscsi_remove_host,
1588                                NULL);
1589
1590 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1591                                "iscsi_session",
1592                                NULL,
1593                                NULL,
1594                                NULL);
1595
1596 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1597                                "iscsi_connection",
1598                                NULL,
1599                                NULL,
1600                                NULL);
1601
1602 static struct sock *nls;
1603 static DEFINE_MUTEX(rx_queue_mutex);
1604
1605 static LIST_HEAD(sesslist);
1606 static DEFINE_SPINLOCK(sesslock);
1607 static LIST_HEAD(connlist);
1608 static DEFINE_SPINLOCK(connlock);
1609
1610 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1611 {
1612         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1613         return sess->sid;
1614 }
1615
1616 /*
1617  * Returns the matching session to a given sid
1618  */
1619 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1620 {
1621         unsigned long flags;
1622         struct iscsi_cls_session *sess;
1623
1624         spin_lock_irqsave(&sesslock, flags);
1625         list_for_each_entry(sess, &sesslist, sess_list) {
1626                 if (sess->sid == sid) {
1627                         spin_unlock_irqrestore(&sesslock, flags);
1628                         return sess;
1629                 }
1630         }
1631         spin_unlock_irqrestore(&sesslock, flags);
1632         return NULL;
1633 }
1634
1635 /*
1636  * Returns the matching connection to a given sid / cid tuple
1637  */
1638 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1639 {
1640         unsigned long flags;
1641         struct iscsi_cls_conn *conn;
1642
1643         spin_lock_irqsave(&connlock, flags);
1644         list_for_each_entry(conn, &connlist, conn_list) {
1645                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1646                         spin_unlock_irqrestore(&connlock, flags);
1647                         return conn;
1648                 }
1649         }
1650         spin_unlock_irqrestore(&connlock, flags);
1651         return NULL;
1652 }
1653
1654 /*
1655  * The following functions can be used by LLDs that allocate
1656  * their own scsi_hosts or by software iscsi LLDs
1657  */
1658 static struct {
1659         int value;
1660         char *name;
1661 } iscsi_session_state_names[] = {
1662         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1663         { ISCSI_SESSION_FAILED,         "FAILED" },
1664         { ISCSI_SESSION_FREE,           "FREE" },
1665 };
1666
1667 static const char *iscsi_session_state_name(int state)
1668 {
1669         int i;
1670         char *name = NULL;
1671
1672         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1673                 if (iscsi_session_state_names[i].value == state) {
1674                         name = iscsi_session_state_names[i].name;
1675                         break;
1676                 }
1677         }
1678         return name;
1679 }
1680
1681 static char *iscsi_session_target_state_name[] = {
1682         [ISCSI_SESSION_TARGET_UNBOUND]   = "UNBOUND",
1683         [ISCSI_SESSION_TARGET_ALLOCATED] = "ALLOCATED",
1684         [ISCSI_SESSION_TARGET_SCANNED]   = "SCANNED",
1685         [ISCSI_SESSION_TARGET_UNBINDING] = "UNBINDING",
1686 };
1687
1688 int iscsi_session_chkready(struct iscsi_cls_session *session)
1689 {
1690         int err;
1691
1692         switch (session->state) {
1693         case ISCSI_SESSION_LOGGED_IN:
1694                 err = 0;
1695                 break;
1696         case ISCSI_SESSION_FAILED:
1697                 err = DID_IMM_RETRY << 16;
1698                 break;
1699         case ISCSI_SESSION_FREE:
1700                 err = DID_TRANSPORT_FAILFAST << 16;
1701                 break;
1702         default:
1703                 err = DID_NO_CONNECT << 16;
1704                 break;
1705         }
1706         return err;
1707 }
1708 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1709
1710 int iscsi_is_session_online(struct iscsi_cls_session *session)
1711 {
1712         unsigned long flags;
1713         int ret = 0;
1714
1715         spin_lock_irqsave(&session->lock, flags);
1716         if (session->state == ISCSI_SESSION_LOGGED_IN)
1717                 ret = 1;
1718         spin_unlock_irqrestore(&session->lock, flags);
1719         return ret;
1720 }
1721 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1722
1723 static void iscsi_session_release(struct device *dev)
1724 {
1725         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1726         struct Scsi_Host *shost;
1727
1728         shost = iscsi_session_to_shost(session);
1729         scsi_host_put(shost);
1730         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1731         kfree(session);
1732 }
1733
1734 int iscsi_is_session_dev(const struct device *dev)
1735 {
1736         return dev->release == iscsi_session_release;
1737 }
1738 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1739
1740 static int iscsi_iter_session_fn(struct device *dev, void *data)
1741 {
1742         void (* fn) (struct iscsi_cls_session *) = data;
1743
1744         if (!iscsi_is_session_dev(dev))
1745                 return 0;
1746         fn(iscsi_dev_to_session(dev));
1747         return 0;
1748 }
1749
1750 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1751                                  void (*fn)(struct iscsi_cls_session *))
1752 {
1753         device_for_each_child(&shost->shost_gendev, fn,
1754                               iscsi_iter_session_fn);
1755 }
1756 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1757
1758 struct iscsi_scan_data {
1759         unsigned int channel;
1760         unsigned int id;
1761         u64 lun;
1762         enum scsi_scan_mode rescan;
1763 };
1764
1765 static int iscsi_user_scan_session(struct device *dev, void *data)
1766 {
1767         struct iscsi_scan_data *scan_data = data;
1768         struct iscsi_cls_session *session;
1769         struct Scsi_Host *shost;
1770         struct iscsi_cls_host *ihost;
1771         unsigned long flags;
1772         unsigned int id;
1773
1774         if (!iscsi_is_session_dev(dev))
1775                 return 0;
1776
1777         session = iscsi_dev_to_session(dev);
1778
1779         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1780
1781         shost = iscsi_session_to_shost(session);
1782         ihost = shost->shost_data;
1783
1784         mutex_lock(&ihost->mutex);
1785         spin_lock_irqsave(&session->lock, flags);
1786         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1787                 spin_unlock_irqrestore(&session->lock, flags);
1788                 goto user_scan_exit;
1789         }
1790         id = session->target_id;
1791         spin_unlock_irqrestore(&session->lock, flags);
1792
1793         if (id != ISCSI_MAX_TARGET) {
1794                 if ((scan_data->channel == SCAN_WILD_CARD ||
1795                      scan_data->channel == 0) &&
1796                     (scan_data->id == SCAN_WILD_CARD ||
1797                      scan_data->id == id)) {
1798                         scsi_scan_target(&session->dev, 0, id,
1799                                          scan_data->lun, scan_data->rescan);
1800                         spin_lock_irqsave(&session->lock, flags);
1801                         session->target_state = ISCSI_SESSION_TARGET_SCANNED;
1802                         spin_unlock_irqrestore(&session->lock, flags);
1803                 }
1804         }
1805
1806 user_scan_exit:
1807         mutex_unlock(&ihost->mutex);
1808         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1809         return 0;
1810 }
1811
1812 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1813                            uint id, u64 lun)
1814 {
1815         struct iscsi_scan_data scan_data;
1816
1817         scan_data.channel = channel;
1818         scan_data.id = id;
1819         scan_data.lun = lun;
1820         scan_data.rescan = SCSI_SCAN_MANUAL;
1821
1822         return device_for_each_child(&shost->shost_gendev, &scan_data,
1823                                      iscsi_user_scan_session);
1824 }
1825
1826 static void iscsi_scan_session(struct work_struct *work)
1827 {
1828         struct iscsi_cls_session *session =
1829                         container_of(work, struct iscsi_cls_session, scan_work);
1830         struct iscsi_scan_data scan_data;
1831
1832         scan_data.channel = 0;
1833         scan_data.id = SCAN_WILD_CARD;
1834         scan_data.lun = SCAN_WILD_CARD;
1835         scan_data.rescan = SCSI_SCAN_RESCAN;
1836
1837         iscsi_user_scan_session(&session->dev, &scan_data);
1838 }
1839
1840 /**
1841  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1842  * @cmd: scsi cmd passed to scsi eh handler
1843  *
1844  * If the session is down this function will wait for the recovery
1845  * timer to fire or for the session to be logged back in. If the
1846  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1847  * should pass this error value to the scsi eh.
1848  */
1849 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1850 {
1851         struct iscsi_cls_session *session =
1852                         starget_to_session(scsi_target(cmd->device));
1853         unsigned long flags;
1854         int ret = 0;
1855
1856         spin_lock_irqsave(&session->lock, flags);
1857         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1858                 if (session->state == ISCSI_SESSION_FREE) {
1859                         ret = FAST_IO_FAIL;
1860                         break;
1861                 }
1862                 spin_unlock_irqrestore(&session->lock, flags);
1863                 msleep(1000);
1864                 spin_lock_irqsave(&session->lock, flags);
1865         }
1866         spin_unlock_irqrestore(&session->lock, flags);
1867         return ret;
1868 }
1869 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1870
1871 static void session_recovery_timedout(struct work_struct *work)
1872 {
1873         struct iscsi_cls_session *session =
1874                 container_of(work, struct iscsi_cls_session,
1875                              recovery_work.work);
1876         unsigned long flags;
1877
1878         iscsi_cls_session_printk(KERN_INFO, session,
1879                                  "session recovery timed out after %d secs\n",
1880                                  session->recovery_tmo);
1881
1882         spin_lock_irqsave(&session->lock, flags);
1883         switch (session->state) {
1884         case ISCSI_SESSION_FAILED:
1885                 session->state = ISCSI_SESSION_FREE;
1886                 break;
1887         case ISCSI_SESSION_LOGGED_IN:
1888         case ISCSI_SESSION_FREE:
1889                 /* we raced with the unblock's flush */
1890                 spin_unlock_irqrestore(&session->lock, flags);
1891                 return;
1892         }
1893         spin_unlock_irqrestore(&session->lock, flags);
1894
1895         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1896         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1897         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1898
1899         if (session->transport->session_recovery_timedout)
1900                 session->transport->session_recovery_timedout(session);
1901 }
1902
1903 static void __iscsi_unblock_session(struct work_struct *work)
1904 {
1905         struct iscsi_cls_session *session =
1906                         container_of(work, struct iscsi_cls_session,
1907                                      unblock_work);
1908         unsigned long flags;
1909
1910         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1911
1912         cancel_delayed_work_sync(&session->recovery_work);
1913         spin_lock_irqsave(&session->lock, flags);
1914         session->state = ISCSI_SESSION_LOGGED_IN;
1915         spin_unlock_irqrestore(&session->lock, flags);
1916         /* start IO */
1917         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1918         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1919 }
1920
1921 /**
1922  * iscsi_unblock_session - set a session as logged in and start IO.
1923  * @session: iscsi session
1924  *
1925  * Mark a session as ready to accept IO.
1926  */
1927 void iscsi_unblock_session(struct iscsi_cls_session *session)
1928 {
1929         if (!cancel_work_sync(&session->block_work))
1930                 cancel_delayed_work_sync(&session->recovery_work);
1931
1932         queue_work(session->workq, &session->unblock_work);
1933         /*
1934          * Blocking the session can be done from any context so we only
1935          * queue the block work. Make sure the unblock work has completed
1936          * because it flushes/cancels the other works and updates the state.
1937          */
1938         flush_work(&session->unblock_work);
1939 }
1940 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1941
1942 static void __iscsi_block_session(struct work_struct *work)
1943 {
1944         struct iscsi_cls_session *session =
1945                         container_of(work, struct iscsi_cls_session,
1946                                      block_work);
1947         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1948         unsigned long flags;
1949
1950         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1951         spin_lock_irqsave(&session->lock, flags);
1952         session->state = ISCSI_SESSION_FAILED;
1953         spin_unlock_irqrestore(&session->lock, flags);
1954         scsi_block_targets(shost, &session->dev);
1955         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1956         if (session->recovery_tmo >= 0)
1957                 queue_delayed_work(session->workq,
1958                                    &session->recovery_work,
1959                                    session->recovery_tmo * HZ);
1960 }
1961
1962 void iscsi_block_session(struct iscsi_cls_session *session)
1963 {
1964         queue_work(session->workq, &session->block_work);
1965 }
1966 EXPORT_SYMBOL_GPL(iscsi_block_session);
1967
1968 static void __iscsi_unbind_session(struct work_struct *work)
1969 {
1970         struct iscsi_cls_session *session =
1971                         container_of(work, struct iscsi_cls_session,
1972                                      unbind_work);
1973         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1974         struct iscsi_cls_host *ihost = shost->shost_data;
1975         unsigned long flags;
1976         unsigned int target_id;
1977         bool remove_target = true;
1978
1979         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
1980
1981         /* Prevent new scans and make sure scanning is not in progress */
1982         mutex_lock(&ihost->mutex);
1983         spin_lock_irqsave(&session->lock, flags);
1984         if (session->target_state == ISCSI_SESSION_TARGET_ALLOCATED) {
1985                 remove_target = false;
1986         } else if (session->target_state != ISCSI_SESSION_TARGET_SCANNED) {
1987                 spin_unlock_irqrestore(&session->lock, flags);
1988                 mutex_unlock(&ihost->mutex);
1989                 ISCSI_DBG_TRANS_SESSION(session,
1990                         "Skipping target unbinding: Session is unbound/unbinding.\n");
1991                 return;
1992         }
1993
1994         session->target_state = ISCSI_SESSION_TARGET_UNBINDING;
1995         target_id = session->target_id;
1996         session->target_id = ISCSI_MAX_TARGET;
1997         spin_unlock_irqrestore(&session->lock, flags);
1998         mutex_unlock(&ihost->mutex);
1999
2000         if (remove_target)
2001                 scsi_remove_target(&session->dev);
2002
2003         if (session->ida_used)
2004                 ida_free(&iscsi_sess_ida, target_id);
2005
2006         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2007         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2008
2009         spin_lock_irqsave(&session->lock, flags);
2010         session->target_state = ISCSI_SESSION_TARGET_UNBOUND;
2011         spin_unlock_irqrestore(&session->lock, flags);
2012 }
2013
2014 static void __iscsi_destroy_session(struct work_struct *work)
2015 {
2016         struct iscsi_cls_session *session =
2017                 container_of(work, struct iscsi_cls_session, destroy_work);
2018
2019         session->transport->destroy_session(session);
2020 }
2021
2022 struct iscsi_cls_session *
2023 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2024                     int dd_size)
2025 {
2026         struct iscsi_cls_session *session;
2027
2028         session = kzalloc(sizeof(*session) + dd_size,
2029                           GFP_KERNEL);
2030         if (!session)
2031                 return NULL;
2032
2033         session->transport = transport;
2034         session->creator = -1;
2035         session->recovery_tmo = 120;
2036         session->recovery_tmo_sysfs_override = false;
2037         session->state = ISCSI_SESSION_FREE;
2038         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2039         INIT_LIST_HEAD(&session->sess_list);
2040         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2041         INIT_WORK(&session->block_work, __iscsi_block_session);
2042         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2043         INIT_WORK(&session->scan_work, iscsi_scan_session);
2044         INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2045         spin_lock_init(&session->lock);
2046
2047         /* this is released in the dev's release function */
2048         scsi_host_get(shost);
2049         session->dev.parent = &shost->shost_gendev;
2050         session->dev.release = iscsi_session_release;
2051         device_initialize(&session->dev);
2052         if (dd_size)
2053                 session->dd_data = &session[1];
2054
2055         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2056         return session;
2057 }
2058 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2059
2060 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2061 {
2062         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2063         unsigned long flags;
2064         int id = 0;
2065         int err;
2066
2067         session->sid = atomic_add_return(1, &iscsi_session_nr);
2068
2069         session->workq = alloc_workqueue("iscsi_ctrl_%d:%d",
2070                         WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
2071                         shost->host_no, session->sid);
2072         if (!session->workq)
2073                 return -ENOMEM;
2074
2075         if (target_id == ISCSI_MAX_TARGET) {
2076                 id = ida_alloc(&iscsi_sess_ida, GFP_KERNEL);
2077
2078                 if (id < 0) {
2079                         iscsi_cls_session_printk(KERN_ERR, session,
2080                                         "Failure in Target ID Allocation\n");
2081                         err = id;
2082                         goto destroy_wq;
2083                 }
2084                 session->target_id = (unsigned int)id;
2085                 session->ida_used = true;
2086         } else
2087                 session->target_id = target_id;
2088         spin_lock_irqsave(&session->lock, flags);
2089         session->target_state = ISCSI_SESSION_TARGET_ALLOCATED;
2090         spin_unlock_irqrestore(&session->lock, flags);
2091
2092         dev_set_name(&session->dev, "session%u", session->sid);
2093         err = device_add(&session->dev);
2094         if (err) {
2095                 iscsi_cls_session_printk(KERN_ERR, session,
2096                                          "could not register session's dev\n");
2097                 goto release_ida;
2098         }
2099         err = transport_register_device(&session->dev);
2100         if (err) {
2101                 iscsi_cls_session_printk(KERN_ERR, session,
2102                                          "could not register transport's dev\n");
2103                 goto release_dev;
2104         }
2105
2106         spin_lock_irqsave(&sesslock, flags);
2107         list_add(&session->sess_list, &sesslist);
2108         spin_unlock_irqrestore(&sesslock, flags);
2109
2110         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2111         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2112         return 0;
2113
2114 release_dev:
2115         device_del(&session->dev);
2116 release_ida:
2117         if (session->ida_used)
2118                 ida_free(&iscsi_sess_ida, session->target_id);
2119 destroy_wq:
2120         destroy_workqueue(session->workq);
2121         return err;
2122 }
2123 EXPORT_SYMBOL_GPL(iscsi_add_session);
2124
2125 /**
2126  * iscsi_create_session - create iscsi class session
2127  * @shost: scsi host
2128  * @transport: iscsi transport
2129  * @dd_size: private driver data size
2130  * @target_id: which target
2131  *
2132  * This can be called from a LLD or iscsi_transport.
2133  */
2134 struct iscsi_cls_session *
2135 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2136                      int dd_size, unsigned int target_id)
2137 {
2138         struct iscsi_cls_session *session;
2139
2140         session = iscsi_alloc_session(shost, transport, dd_size);
2141         if (!session)
2142                 return NULL;
2143
2144         if (iscsi_add_session(session, target_id)) {
2145                 iscsi_free_session(session);
2146                 return NULL;
2147         }
2148         return session;
2149 }
2150 EXPORT_SYMBOL_GPL(iscsi_create_session);
2151
2152 static void iscsi_conn_release(struct device *dev)
2153 {
2154         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2155         struct device *parent = conn->dev.parent;
2156
2157         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2158         kfree(conn);
2159         put_device(parent);
2160 }
2161
2162 static int iscsi_is_conn_dev(const struct device *dev)
2163 {
2164         return dev->release == iscsi_conn_release;
2165 }
2166
2167 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2168 {
2169         if (!iscsi_is_conn_dev(dev))
2170                 return 0;
2171
2172         iscsi_remove_conn(iscsi_dev_to_conn(dev));
2173         return 0;
2174 }
2175
2176 void iscsi_remove_session(struct iscsi_cls_session *session)
2177 {
2178         unsigned long flags;
2179         int err;
2180
2181         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2182
2183         spin_lock_irqsave(&sesslock, flags);
2184         if (!list_empty(&session->sess_list))
2185                 list_del(&session->sess_list);
2186         spin_unlock_irqrestore(&sesslock, flags);
2187
2188         if (!cancel_work_sync(&session->block_work))
2189                 cancel_delayed_work_sync(&session->recovery_work);
2190         cancel_work_sync(&session->unblock_work);
2191         /*
2192          * If we are blocked let commands flow again. The lld or iscsi
2193          * layer should set up the queuecommand to fail commands.
2194          * We assume that LLD will not be calling block/unblock while
2195          * removing the session.
2196          */
2197         spin_lock_irqsave(&session->lock, flags);
2198         session->state = ISCSI_SESSION_FREE;
2199         spin_unlock_irqrestore(&session->lock, flags);
2200
2201         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2202         /*
2203          * qla4xxx can perform it's own scans when it runs in kernel only
2204          * mode. Make sure to flush those scans.
2205          */
2206         flush_work(&session->scan_work);
2207         /* flush running unbind operations */
2208         flush_work(&session->unbind_work);
2209         __iscsi_unbind_session(&session->unbind_work);
2210
2211         /* hw iscsi may not have removed all connections from session */
2212         err = device_for_each_child(&session->dev, NULL,
2213                                     iscsi_iter_destroy_conn_fn);
2214         if (err)
2215                 iscsi_cls_session_printk(KERN_ERR, session,
2216                                          "Could not delete all connections "
2217                                          "for session. Error %d.\n", err);
2218
2219         transport_unregister_device(&session->dev);
2220
2221         destroy_workqueue(session->workq);
2222
2223         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2224         device_del(&session->dev);
2225 }
2226 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2227
2228 static void iscsi_stop_conn(struct iscsi_cls_conn *conn, int flag)
2229 {
2230         ISCSI_DBG_TRANS_CONN(conn, "Stopping conn.\n");
2231
2232         switch (flag) {
2233         case STOP_CONN_RECOVER:
2234                 WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2235                 break;
2236         case STOP_CONN_TERM:
2237                 WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2238                 break;
2239         default:
2240                 iscsi_cls_conn_printk(KERN_ERR, conn, "invalid stop flag %d\n",
2241                                       flag);
2242                 return;
2243         }
2244
2245         conn->transport->stop_conn(conn, flag);
2246         ISCSI_DBG_TRANS_CONN(conn, "Stopping conn done.\n");
2247 }
2248
2249 static void iscsi_ep_disconnect(struct iscsi_cls_conn *conn, bool is_active)
2250 {
2251         struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2252         struct iscsi_endpoint *ep;
2253
2254         ISCSI_DBG_TRANS_CONN(conn, "disconnect ep.\n");
2255         WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2256
2257         if (!conn->ep || !session->transport->ep_disconnect)
2258                 return;
2259
2260         ep = conn->ep;
2261         conn->ep = NULL;
2262
2263         session->transport->unbind_conn(conn, is_active);
2264         session->transport->ep_disconnect(ep);
2265         ISCSI_DBG_TRANS_CONN(conn, "disconnect ep done.\n");
2266 }
2267
2268 static void iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn *conn,
2269                                          struct iscsi_endpoint *ep,
2270                                          bool is_active)
2271 {
2272         /* Check if this was a conn error and the kernel took ownership */
2273         spin_lock_irq(&conn->lock);
2274         if (!test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2275                 spin_unlock_irq(&conn->lock);
2276                 iscsi_ep_disconnect(conn, is_active);
2277         } else {
2278                 spin_unlock_irq(&conn->lock);
2279                 ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
2280                 mutex_unlock(&conn->ep_mutex);
2281
2282                 flush_work(&conn->cleanup_work);
2283                 /*
2284                  * Userspace is now done with the EP so we can release the ref
2285                  * iscsi_cleanup_conn_work_fn took.
2286                  */
2287                 iscsi_put_endpoint(ep);
2288                 mutex_lock(&conn->ep_mutex);
2289         }
2290 }
2291
2292 static int iscsi_if_stop_conn(struct iscsi_cls_conn *conn, int flag)
2293 {
2294         ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop.\n");
2295         /*
2296          * For offload, iscsid may not know about the ep like when iscsid is
2297          * restarted or for kernel based session shutdown iscsid is not even
2298          * up. For these cases, we do the disconnect now.
2299          */
2300         mutex_lock(&conn->ep_mutex);
2301         if (conn->ep)
2302                 iscsi_if_disconnect_bound_ep(conn, conn->ep, true);
2303         mutex_unlock(&conn->ep_mutex);
2304
2305         /*
2306          * If this is a termination we have to call stop_conn with that flag
2307          * so the correct states get set. If we haven't run the work yet try to
2308          * avoid the extra run.
2309          */
2310         if (flag == STOP_CONN_TERM) {
2311                 cancel_work_sync(&conn->cleanup_work);
2312                 iscsi_stop_conn(conn, flag);
2313         } else {
2314                 /*
2315                  * Figure out if it was the kernel or userspace initiating this.
2316                  */
2317                 spin_lock_irq(&conn->lock);
2318                 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2319                         spin_unlock_irq(&conn->lock);
2320                         iscsi_stop_conn(conn, flag);
2321                 } else {
2322                         spin_unlock_irq(&conn->lock);
2323                         ISCSI_DBG_TRANS_CONN(conn,
2324                                              "flush kernel conn cleanup.\n");
2325                         flush_work(&conn->cleanup_work);
2326                 }
2327                 /*
2328                  * Only clear for recovery to avoid extra cleanup runs during
2329                  * termination.
2330                  */
2331                 spin_lock_irq(&conn->lock);
2332                 clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2333                 spin_unlock_irq(&conn->lock);
2334         }
2335         ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop done.\n");
2336         return 0;
2337 }
2338
2339 static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
2340 {
2341         struct iscsi_cls_conn *conn = container_of(work, struct iscsi_cls_conn,
2342                                                    cleanup_work);
2343         struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2344
2345         mutex_lock(&conn->ep_mutex);
2346         /*
2347          * Get a ref to the ep, so we don't release its ID until after
2348          * userspace is done referencing it in iscsi_if_disconnect_bound_ep.
2349          */
2350         if (conn->ep)
2351                 get_device(&conn->ep->dev);
2352         iscsi_ep_disconnect(conn, false);
2353
2354         if (system_state != SYSTEM_RUNNING) {
2355                 /*
2356                  * If the user has set up for the session to never timeout
2357                  * then hang like they wanted. For all other cases fail right
2358                  * away since userspace is not going to relogin.
2359                  */
2360                 if (session->recovery_tmo > 0)
2361                         session->recovery_tmo = 0;
2362         }
2363
2364         iscsi_stop_conn(conn, STOP_CONN_RECOVER);
2365         mutex_unlock(&conn->ep_mutex);
2366         ISCSI_DBG_TRANS_CONN(conn, "cleanup done.\n");
2367 }
2368
2369 static int iscsi_iter_force_destroy_conn_fn(struct device *dev, void *data)
2370 {
2371         struct iscsi_transport *transport;
2372         struct iscsi_cls_conn *conn;
2373
2374         if (!iscsi_is_conn_dev(dev))
2375                 return 0;
2376
2377         conn = iscsi_dev_to_conn(dev);
2378         transport = conn->transport;
2379
2380         if (READ_ONCE(conn->state) != ISCSI_CONN_DOWN)
2381                 iscsi_if_stop_conn(conn, STOP_CONN_TERM);
2382
2383         transport->destroy_conn(conn);
2384         return 0;
2385 }
2386
2387 /**
2388  * iscsi_force_destroy_session - destroy a session from the kernel
2389  * @session: session to destroy
2390  *
2391  * Force the destruction of a session from the kernel. This should only be
2392  * used when userspace is no longer running during system shutdown.
2393  */
2394 void iscsi_force_destroy_session(struct iscsi_cls_session *session)
2395 {
2396         struct iscsi_transport *transport = session->transport;
2397         unsigned long flags;
2398
2399         WARN_ON_ONCE(system_state == SYSTEM_RUNNING);
2400
2401         spin_lock_irqsave(&sesslock, flags);
2402         if (list_empty(&session->sess_list)) {
2403                 spin_unlock_irqrestore(&sesslock, flags);
2404                 /*
2405                  * Conn/ep is already freed. Session is being torn down via
2406                  * async path. For shutdown we don't care about it so return.
2407                  */
2408                 return;
2409         }
2410         spin_unlock_irqrestore(&sesslock, flags);
2411
2412         device_for_each_child(&session->dev, NULL,
2413                               iscsi_iter_force_destroy_conn_fn);
2414         transport->destroy_session(session);
2415 }
2416 EXPORT_SYMBOL_GPL(iscsi_force_destroy_session);
2417
2418 void iscsi_free_session(struct iscsi_cls_session *session)
2419 {
2420         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2421         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2422         put_device(&session->dev);
2423 }
2424 EXPORT_SYMBOL_GPL(iscsi_free_session);
2425
2426 /**
2427  * iscsi_alloc_conn - alloc iscsi class connection
2428  * @session: iscsi cls session
2429  * @dd_size: private driver data size
2430  * @cid: connection id
2431  */
2432 struct iscsi_cls_conn *
2433 iscsi_alloc_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2434 {
2435         struct iscsi_transport *transport = session->transport;
2436         struct iscsi_cls_conn *conn;
2437
2438         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2439         if (!conn)
2440                 return NULL;
2441         if (dd_size)
2442                 conn->dd_data = &conn[1];
2443
2444         mutex_init(&conn->ep_mutex);
2445         spin_lock_init(&conn->lock);
2446         INIT_LIST_HEAD(&conn->conn_list);
2447         INIT_WORK(&conn->cleanup_work, iscsi_cleanup_conn_work_fn);
2448         conn->transport = transport;
2449         conn->cid = cid;
2450         WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2451
2452         /* this is released in the dev's release function */
2453         if (!get_device(&session->dev))
2454                 goto free_conn;
2455
2456         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2457         device_initialize(&conn->dev);
2458         conn->dev.parent = &session->dev;
2459         conn->dev.release = iscsi_conn_release;
2460
2461         return conn;
2462
2463 free_conn:
2464         kfree(conn);
2465         return NULL;
2466 }
2467 EXPORT_SYMBOL_GPL(iscsi_alloc_conn);
2468
2469 /**
2470  * iscsi_add_conn - add iscsi class connection
2471  * @conn: iscsi cls connection
2472  *
2473  * This will expose iscsi_cls_conn to sysfs so make sure the related
2474  * resources for sysfs attributes are initialized before calling this.
2475  */
2476 int iscsi_add_conn(struct iscsi_cls_conn *conn)
2477 {
2478         int err;
2479         unsigned long flags;
2480         struct iscsi_cls_session *session = iscsi_dev_to_session(conn->dev.parent);
2481
2482         err = device_add(&conn->dev);
2483         if (err) {
2484                 iscsi_cls_session_printk(KERN_ERR, session,
2485                                          "could not register connection's dev\n");
2486                 return err;
2487         }
2488         err = transport_register_device(&conn->dev);
2489         if (err) {
2490                 iscsi_cls_session_printk(KERN_ERR, session,
2491                                          "could not register transport's dev\n");
2492                 device_del(&conn->dev);
2493                 return err;
2494         }
2495
2496         spin_lock_irqsave(&connlock, flags);
2497         list_add(&conn->conn_list, &connlist);
2498         spin_unlock_irqrestore(&connlock, flags);
2499
2500         return 0;
2501 }
2502 EXPORT_SYMBOL_GPL(iscsi_add_conn);
2503
2504 /**
2505  * iscsi_remove_conn - remove iscsi class connection from sysfs
2506  * @conn: iscsi cls connection
2507  *
2508  * Remove iscsi_cls_conn from sysfs, and wait for previous
2509  * read/write of iscsi_cls_conn's attributes in sysfs to finish.
2510  */
2511 void iscsi_remove_conn(struct iscsi_cls_conn *conn)
2512 {
2513         unsigned long flags;
2514
2515         spin_lock_irqsave(&connlock, flags);
2516         list_del(&conn->conn_list);
2517         spin_unlock_irqrestore(&connlock, flags);
2518
2519         transport_unregister_device(&conn->dev);
2520         device_del(&conn->dev);
2521 }
2522 EXPORT_SYMBOL_GPL(iscsi_remove_conn);
2523
2524 void iscsi_put_conn(struct iscsi_cls_conn *conn)
2525 {
2526         put_device(&conn->dev);
2527 }
2528 EXPORT_SYMBOL_GPL(iscsi_put_conn);
2529
2530 void iscsi_get_conn(struct iscsi_cls_conn *conn)
2531 {
2532         get_device(&conn->dev);
2533 }
2534 EXPORT_SYMBOL_GPL(iscsi_get_conn);
2535
2536 /*
2537  * iscsi interface functions
2538  */
2539 static struct iscsi_internal *
2540 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2541 {
2542         struct iscsi_internal *priv;
2543         unsigned long flags;
2544
2545         spin_lock_irqsave(&iscsi_transport_lock, flags);
2546         list_for_each_entry(priv, &iscsi_transports, list) {
2547                 if (tt == priv->iscsi_transport) {
2548                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2549                         return priv;
2550                 }
2551         }
2552         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2553         return NULL;
2554 }
2555
2556 static int
2557 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2558 {
2559         return nlmsg_multicast(nls, skb, 0, group, gfp);
2560 }
2561
2562 static int
2563 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2564 {
2565         return nlmsg_unicast(nls, skb, portid);
2566 }
2567
2568 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2569                    char *data, uint32_t data_size)
2570 {
2571         struct nlmsghdr *nlh;
2572         struct sk_buff *skb;
2573         struct iscsi_uevent *ev;
2574         char *pdu;
2575         struct iscsi_internal *priv;
2576         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2577                                    data_size);
2578
2579         priv = iscsi_if_transport_lookup(conn->transport);
2580         if (!priv)
2581                 return -EINVAL;
2582
2583         skb = alloc_skb(len, GFP_ATOMIC);
2584         if (!skb) {
2585                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2586                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2587                                       "control PDU: OOM\n");
2588                 return -ENOMEM;
2589         }
2590
2591         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2592         ev = nlmsg_data(nlh);
2593         memset(ev, 0, sizeof(*ev));
2594         ev->transport_handle = iscsi_handle(conn->transport);
2595         ev->type = ISCSI_KEVENT_RECV_PDU;
2596         ev->r.recv_req.cid = conn->cid;
2597         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2598         pdu = (char*)ev + sizeof(*ev);
2599         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2600         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2601
2602         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2603 }
2604 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2605
2606 int iscsi_offload_mesg(struct Scsi_Host *shost,
2607                        struct iscsi_transport *transport, uint32_t type,
2608                        char *data, uint16_t data_size)
2609 {
2610         struct nlmsghdr *nlh;
2611         struct sk_buff *skb;
2612         struct iscsi_uevent *ev;
2613         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2614
2615         skb = alloc_skb(len, GFP_ATOMIC);
2616         if (!skb) {
2617                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2618                 return -ENOMEM;
2619         }
2620
2621         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2622         ev = nlmsg_data(nlh);
2623         memset(ev, 0, sizeof(*ev));
2624         ev->type = type;
2625         ev->transport_handle = iscsi_handle(transport);
2626         switch (type) {
2627         case ISCSI_KEVENT_PATH_REQ:
2628                 ev->r.req_path.host_no = shost->host_no;
2629                 break;
2630         case ISCSI_KEVENT_IF_DOWN:
2631                 ev->r.notify_if_down.host_no = shost->host_no;
2632                 break;
2633         }
2634
2635         memcpy((char *)ev + sizeof(*ev), data, data_size);
2636
2637         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2638 }
2639 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2640
2641 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2642 {
2643         struct nlmsghdr *nlh;
2644         struct sk_buff  *skb;
2645         struct iscsi_uevent *ev;
2646         struct iscsi_internal *priv;
2647         int len = nlmsg_total_size(sizeof(*ev));
2648         unsigned long flags;
2649         int state;
2650
2651         spin_lock_irqsave(&conn->lock, flags);
2652         /*
2653          * Userspace will only do a stop call if we are at least bound. And, we
2654          * only need to do the in kernel cleanup if in the UP state so cmds can
2655          * be released to upper layers. If in other states just wait for
2656          * userspace to avoid races that can leave the cleanup_work queued.
2657          */
2658         state = READ_ONCE(conn->state);
2659         switch (state) {
2660         case ISCSI_CONN_BOUND:
2661         case ISCSI_CONN_UP:
2662                 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP,
2663                                       &conn->flags)) {
2664                         queue_work(iscsi_conn_cleanup_workq,
2665                                    &conn->cleanup_work);
2666                 }
2667                 break;
2668         default:
2669                 ISCSI_DBG_TRANS_CONN(conn, "Got conn error in state %d\n",
2670                                      state);
2671                 break;
2672         }
2673         spin_unlock_irqrestore(&conn->lock, flags);
2674
2675         priv = iscsi_if_transport_lookup(conn->transport);
2676         if (!priv)
2677                 return;
2678
2679         skb = alloc_skb(len, GFP_ATOMIC);
2680         if (!skb) {
2681                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2682                                       "conn error (%d)\n", error);
2683                 return;
2684         }
2685
2686         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2687         ev = nlmsg_data(nlh);
2688         ev->transport_handle = iscsi_handle(conn->transport);
2689         ev->type = ISCSI_KEVENT_CONN_ERROR;
2690         ev->r.connerror.error = error;
2691         ev->r.connerror.cid = conn->cid;
2692         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2693
2694         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2695
2696         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2697                               error);
2698 }
2699 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2700
2701 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2702                             enum iscsi_conn_state state)
2703 {
2704         struct nlmsghdr *nlh;
2705         struct sk_buff  *skb;
2706         struct iscsi_uevent *ev;
2707         struct iscsi_internal *priv;
2708         int len = nlmsg_total_size(sizeof(*ev));
2709
2710         priv = iscsi_if_transport_lookup(conn->transport);
2711         if (!priv)
2712                 return;
2713
2714         skb = alloc_skb(len, GFP_ATOMIC);
2715         if (!skb) {
2716                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2717                                       "conn login (%d)\n", state);
2718                 return;
2719         }
2720
2721         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2722         ev = nlmsg_data(nlh);
2723         ev->transport_handle = iscsi_handle(conn->transport);
2724         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2725         ev->r.conn_login.state = state;
2726         ev->r.conn_login.cid = conn->cid;
2727         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2728         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2729
2730         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2731                               state);
2732 }
2733 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2734
2735 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2736                            enum iscsi_host_event_code code, uint32_t data_size,
2737                            uint8_t *data)
2738 {
2739         struct nlmsghdr *nlh;
2740         struct sk_buff *skb;
2741         struct iscsi_uevent *ev;
2742         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2743
2744         skb = alloc_skb(len, GFP_NOIO);
2745         if (!skb) {
2746                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2747                        host_no, code);
2748                 return;
2749         }
2750
2751         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2752         ev = nlmsg_data(nlh);
2753         ev->transport_handle = iscsi_handle(transport);
2754         ev->type = ISCSI_KEVENT_HOST_EVENT;
2755         ev->r.host_event.host_no = host_no;
2756         ev->r.host_event.code = code;
2757         ev->r.host_event.data_size = data_size;
2758
2759         if (data_size)
2760                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2761
2762         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2763 }
2764 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2765
2766 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2767                            uint32_t status, uint32_t pid, uint32_t data_size,
2768                            uint8_t *data)
2769 {
2770         struct nlmsghdr *nlh;
2771         struct sk_buff *skb;
2772         struct iscsi_uevent *ev;
2773         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2774
2775         skb = alloc_skb(len, GFP_NOIO);
2776         if (!skb) {
2777                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2778                 return;
2779         }
2780
2781         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2782         ev = nlmsg_data(nlh);
2783         ev->transport_handle = iscsi_handle(transport);
2784         ev->type = ISCSI_KEVENT_PING_COMP;
2785         ev->r.ping_comp.host_no = host_no;
2786         ev->r.ping_comp.status = status;
2787         ev->r.ping_comp.pid = pid;
2788         ev->r.ping_comp.data_size = data_size;
2789         memcpy((char *)ev + sizeof(*ev), data, data_size);
2790
2791         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2792 }
2793 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2794
2795 static int
2796 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2797 {
2798         struct sk_buff  *skb;
2799         struct nlmsghdr *nlh;
2800         int len = nlmsg_total_size(size);
2801
2802         skb = alloc_skb(len, GFP_ATOMIC);
2803         if (!skb) {
2804                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2805                 return -ENOMEM;
2806         }
2807
2808         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2809         memcpy(nlmsg_data(nlh), payload, size);
2810         return iscsi_unicast_skb(skb, portid);
2811 }
2812
2813 static int
2814 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2815 {
2816         struct iscsi_uevent *ev = nlmsg_data(nlh);
2817         struct iscsi_stats *stats;
2818         struct sk_buff *skbstat;
2819         struct iscsi_cls_conn *conn;
2820         struct nlmsghdr *nlhstat;
2821         struct iscsi_uevent *evstat;
2822         struct iscsi_internal *priv;
2823         int len = nlmsg_total_size(sizeof(*ev) +
2824                                    sizeof(struct iscsi_stats) +
2825                                    sizeof(struct iscsi_stats_custom) *
2826                                    ISCSI_STATS_CUSTOM_MAX);
2827         int err = 0;
2828
2829         priv = iscsi_if_transport_lookup(transport);
2830         if (!priv)
2831                 return -EINVAL;
2832
2833         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2834         if (!conn)
2835                 return -EEXIST;
2836
2837         do {
2838                 int actual_size;
2839
2840                 skbstat = alloc_skb(len, GFP_ATOMIC);
2841                 if (!skbstat) {
2842                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2843                                               "deliver stats: OOM\n");
2844                         return -ENOMEM;
2845                 }
2846
2847                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2848                                       (len - sizeof(*nlhstat)), 0);
2849                 evstat = nlmsg_data(nlhstat);
2850                 memset(evstat, 0, sizeof(*evstat));
2851                 evstat->transport_handle = iscsi_handle(conn->transport);
2852                 evstat->type = nlh->nlmsg_type;
2853                 evstat->u.get_stats.cid =
2854                         ev->u.get_stats.cid;
2855                 evstat->u.get_stats.sid =
2856                         ev->u.get_stats.sid;
2857                 stats = (struct iscsi_stats *)
2858                         ((char*)evstat + sizeof(*evstat));
2859                 memset(stats, 0, sizeof(*stats));
2860
2861                 transport->get_stats(conn, stats);
2862                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2863                                                sizeof(struct iscsi_stats) +
2864                                                sizeof(struct iscsi_stats_custom) *
2865                                                stats->custom_length);
2866                 actual_size -= sizeof(*nlhstat);
2867                 actual_size = nlmsg_msg_size(actual_size);
2868                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2869                 nlhstat->nlmsg_len = actual_size;
2870
2871                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2872                                           GFP_ATOMIC);
2873         } while (err < 0 && err != -ECONNREFUSED);
2874
2875         return err;
2876 }
2877
2878 /**
2879  * iscsi_session_event - send session destr. completion event
2880  * @session: iscsi class session
2881  * @event: type of event
2882  */
2883 int iscsi_session_event(struct iscsi_cls_session *session,
2884                         enum iscsi_uevent_e event)
2885 {
2886         struct iscsi_internal *priv;
2887         struct Scsi_Host *shost;
2888         struct iscsi_uevent *ev;
2889         struct sk_buff  *skb;
2890         struct nlmsghdr *nlh;
2891         int rc, len = nlmsg_total_size(sizeof(*ev));
2892
2893         priv = iscsi_if_transport_lookup(session->transport);
2894         if (!priv)
2895                 return -EINVAL;
2896         shost = iscsi_session_to_shost(session);
2897
2898         skb = alloc_skb(len, GFP_KERNEL);
2899         if (!skb) {
2900                 iscsi_cls_session_printk(KERN_ERR, session,
2901                                          "Cannot notify userspace of session "
2902                                          "event %u\n", event);
2903                 return -ENOMEM;
2904         }
2905
2906         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2907         ev = nlmsg_data(nlh);
2908         ev->transport_handle = iscsi_handle(session->transport);
2909
2910         ev->type = event;
2911         switch (event) {
2912         case ISCSI_KEVENT_DESTROY_SESSION:
2913                 ev->r.d_session.host_no = shost->host_no;
2914                 ev->r.d_session.sid = session->sid;
2915                 break;
2916         case ISCSI_KEVENT_CREATE_SESSION:
2917                 ev->r.c_session_ret.host_no = shost->host_no;
2918                 ev->r.c_session_ret.sid = session->sid;
2919                 break;
2920         case ISCSI_KEVENT_UNBIND_SESSION:
2921                 ev->r.unbind_session.host_no = shost->host_no;
2922                 ev->r.unbind_session.sid = session->sid;
2923                 break;
2924         default:
2925                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2926                                          "%u.\n", event);
2927                 kfree_skb(skb);
2928                 return -EINVAL;
2929         }
2930
2931         /*
2932          * this will occur if the daemon is not up, so we just warn
2933          * the user and when the daemon is restarted it will handle it
2934          */
2935         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2936         if (rc == -ESRCH)
2937                 iscsi_cls_session_printk(KERN_ERR, session,
2938                                          "Cannot notify userspace of session "
2939                                          "event %u. Check iscsi daemon\n",
2940                                          event);
2941
2942         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2943                                 event, rc);
2944         return rc;
2945 }
2946 EXPORT_SYMBOL_GPL(iscsi_session_event);
2947
2948 static int
2949 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2950                         struct iscsi_uevent *ev, pid_t pid,
2951                         uint32_t initial_cmdsn, uint16_t cmds_max,
2952                         uint16_t queue_depth)
2953 {
2954         struct iscsi_transport *transport = priv->iscsi_transport;
2955         struct iscsi_cls_session *session;
2956         struct Scsi_Host *shost;
2957
2958         session = transport->create_session(ep, cmds_max, queue_depth,
2959                                             initial_cmdsn);
2960         if (!session)
2961                 return -ENOMEM;
2962
2963         session->creator = pid;
2964         shost = iscsi_session_to_shost(session);
2965         ev->r.c_session_ret.host_no = shost->host_no;
2966         ev->r.c_session_ret.sid = session->sid;
2967         ISCSI_DBG_TRANS_SESSION(session,
2968                                 "Completed creating transport session\n");
2969         return 0;
2970 }
2971
2972 static int
2973 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2974 {
2975         struct iscsi_cls_conn *conn;
2976         struct iscsi_cls_session *session;
2977
2978         session = iscsi_session_lookup(ev->u.c_conn.sid);
2979         if (!session) {
2980                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2981                        ev->u.c_conn.sid);
2982                 return -EINVAL;
2983         }
2984
2985         conn = transport->create_conn(session, ev->u.c_conn.cid);
2986         if (!conn) {
2987                 iscsi_cls_session_printk(KERN_ERR, session,
2988                                          "couldn't create a new connection.");
2989                 return -ENOMEM;
2990         }
2991
2992         ev->r.c_conn_ret.sid = session->sid;
2993         ev->r.c_conn_ret.cid = conn->cid;
2994
2995         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2996         return 0;
2997 }
2998
2999 static int
3000 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3001 {
3002         struct iscsi_cls_conn *conn;
3003
3004         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
3005         if (!conn)
3006                 return -EINVAL;
3007
3008         ISCSI_DBG_TRANS_CONN(conn, "Flushing cleanup during destruction\n");
3009         flush_work(&conn->cleanup_work);
3010         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
3011
3012         if (transport->destroy_conn)
3013                 transport->destroy_conn(conn);
3014         return 0;
3015 }
3016
3017 static int
3018 iscsi_if_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3019 {
3020         char *data = (char*)ev + sizeof(*ev);
3021         struct iscsi_cls_conn *conn;
3022         struct iscsi_cls_session *session;
3023         int err = 0, value = 0, state;
3024
3025         if (ev->u.set_param.len > rlen ||
3026             ev->u.set_param.len > PAGE_SIZE)
3027                 return -EINVAL;
3028
3029         session = iscsi_session_lookup(ev->u.set_param.sid);
3030         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
3031         if (!conn || !session)
3032                 return -EINVAL;
3033
3034         /* data will be regarded as NULL-ended string, do length check */
3035         if (strlen(data) > ev->u.set_param.len)
3036                 return -EINVAL;
3037
3038         switch (ev->u.set_param.param) {
3039         case ISCSI_PARAM_SESS_RECOVERY_TMO:
3040                 sscanf(data, "%d", &value);
3041                 if (!session->recovery_tmo_sysfs_override)
3042                         session->recovery_tmo = value;
3043                 break;
3044         default:
3045                 state = READ_ONCE(conn->state);
3046                 if (state == ISCSI_CONN_BOUND || state == ISCSI_CONN_UP) {
3047                         err = transport->set_param(conn, ev->u.set_param.param,
3048                                         data, ev->u.set_param.len);
3049                 } else {
3050                         return -ENOTCONN;
3051                 }
3052         }
3053
3054         return err;
3055 }
3056
3057 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
3058                                struct iscsi_uevent *ev, int msg_type)
3059 {
3060         struct iscsi_endpoint *ep;
3061         struct sockaddr *dst_addr;
3062         struct Scsi_Host *shost = NULL;
3063         int non_blocking, err = 0;
3064
3065         if (!transport->ep_connect)
3066                 return -EINVAL;
3067
3068         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
3069                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
3070                 if (!shost) {
3071                         printk(KERN_ERR "ep connect failed. Could not find "
3072                                "host no %u\n",
3073                                ev->u.ep_connect_through_host.host_no);
3074                         return -ENODEV;
3075                 }
3076                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
3077         } else
3078                 non_blocking = ev->u.ep_connect.non_blocking;
3079
3080         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3081         ep = transport->ep_connect(shost, dst_addr, non_blocking);
3082         if (IS_ERR(ep)) {
3083                 err = PTR_ERR(ep);
3084                 goto release_host;
3085         }
3086
3087         ev->r.ep_connect_ret.handle = ep->id;
3088 release_host:
3089         if (shost)
3090                 scsi_host_put(shost);
3091         return err;
3092 }
3093
3094 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
3095                                   u64 ep_handle)
3096 {
3097         struct iscsi_cls_conn *conn;
3098         struct iscsi_endpoint *ep;
3099
3100         if (!transport->ep_disconnect)
3101                 return -EINVAL;
3102
3103         ep = iscsi_lookup_endpoint(ep_handle);
3104         if (!ep)
3105                 return -EINVAL;
3106
3107         conn = ep->conn;
3108         if (!conn) {
3109                 /*
3110                  * conn was not even bound yet, so we can't get iscsi conn
3111                  * failures yet.
3112                  */
3113                 transport->ep_disconnect(ep);
3114                 goto put_ep;
3115         }
3116
3117         mutex_lock(&conn->ep_mutex);
3118         iscsi_if_disconnect_bound_ep(conn, ep, false);
3119         mutex_unlock(&conn->ep_mutex);
3120 put_ep:
3121         iscsi_put_endpoint(ep);
3122         return 0;
3123 }
3124
3125 static int
3126 iscsi_if_transport_ep(struct iscsi_transport *transport,
3127                       struct iscsi_uevent *ev, int msg_type, u32 rlen)
3128 {
3129         struct iscsi_endpoint *ep;
3130         int rc = 0;
3131
3132         switch (msg_type) {
3133         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3134         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3135                 if (rlen < sizeof(struct sockaddr))
3136                         rc = -EINVAL;
3137                 else
3138                         rc = iscsi_if_ep_connect(transport, ev, msg_type);
3139                 break;
3140         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3141                 if (!transport->ep_poll)
3142                         return -EINVAL;
3143
3144                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
3145                 if (!ep)
3146                         return -EINVAL;
3147
3148                 ev->r.retcode = transport->ep_poll(ep,
3149                                                    ev->u.ep_poll.timeout_ms);
3150                 iscsi_put_endpoint(ep);
3151                 break;
3152         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3153                 rc = iscsi_if_ep_disconnect(transport,
3154                                             ev->u.ep_disconnect.ep_handle);
3155                 break;
3156         }
3157         return rc;
3158 }
3159
3160 static int
3161 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3162                 struct iscsi_uevent *ev, u32 rlen)
3163 {
3164         struct Scsi_Host *shost;
3165         struct sockaddr *dst_addr;
3166         int err;
3167
3168         if (rlen < sizeof(*dst_addr))
3169                 return -EINVAL;
3170
3171         if (!transport->tgt_dscvr)
3172                 return -EINVAL;
3173
3174         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3175         if (!shost) {
3176                 printk(KERN_ERR "target discovery could not find host no %u\n",
3177                        ev->u.tgt_dscvr.host_no);
3178                 return -ENODEV;
3179         }
3180
3181
3182         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3183         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3184                                    ev->u.tgt_dscvr.enable, dst_addr);
3185         scsi_host_put(shost);
3186         return err;
3187 }
3188
3189 static int
3190 iscsi_set_host_param(struct iscsi_transport *transport,
3191                      struct iscsi_uevent *ev, u32 rlen)
3192 {
3193         char *data = (char*)ev + sizeof(*ev);
3194         struct Scsi_Host *shost;
3195         int err;
3196
3197         if (!transport->set_host_param)
3198                 return -ENOSYS;
3199
3200         if (ev->u.set_host_param.len > rlen ||
3201             ev->u.set_host_param.len > PAGE_SIZE)
3202                 return -EINVAL;
3203
3204         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3205         if (!shost) {
3206                 printk(KERN_ERR "set_host_param could not find host no %u\n",
3207                        ev->u.set_host_param.host_no);
3208                 return -ENODEV;
3209         }
3210
3211         /* see similar check in iscsi_if_set_param() */
3212         if (strlen(data) > ev->u.set_host_param.len)
3213                 return -EINVAL;
3214
3215         err = transport->set_host_param(shost, ev->u.set_host_param.param,
3216                                         data, ev->u.set_host_param.len);
3217         scsi_host_put(shost);
3218         return err;
3219 }
3220
3221 static int
3222 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3223 {
3224         struct Scsi_Host *shost;
3225         struct iscsi_path *params;
3226         int err;
3227
3228         if (rlen < sizeof(*params))
3229                 return -EINVAL;
3230
3231         if (!transport->set_path)
3232                 return -ENOSYS;
3233
3234         shost = scsi_host_lookup(ev->u.set_path.host_no);
3235         if (!shost) {
3236                 printk(KERN_ERR "set path could not find host no %u\n",
3237                        ev->u.set_path.host_no);
3238                 return -ENODEV;
3239         }
3240
3241         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3242         err = transport->set_path(shost, params);
3243
3244         scsi_host_put(shost);
3245         return err;
3246 }
3247
3248 static int iscsi_session_has_conns(int sid)
3249 {
3250         struct iscsi_cls_conn *conn;
3251         unsigned long flags;
3252         int found = 0;
3253
3254         spin_lock_irqsave(&connlock, flags);
3255         list_for_each_entry(conn, &connlist, conn_list) {
3256                 if (iscsi_conn_get_sid(conn) == sid) {
3257                         found = 1;
3258                         break;
3259                 }
3260         }
3261         spin_unlock_irqrestore(&connlock, flags);
3262
3263         return found;
3264 }
3265
3266 static int
3267 iscsi_set_iface_params(struct iscsi_transport *transport,
3268                        struct iscsi_uevent *ev, uint32_t len)
3269 {
3270         char *data = (char *)ev + sizeof(*ev);
3271         struct Scsi_Host *shost;
3272         int err;
3273
3274         if (!transport->set_iface_param)
3275                 return -ENOSYS;
3276
3277         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3278         if (!shost) {
3279                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
3280                        ev->u.set_iface_params.host_no);
3281                 return -ENODEV;
3282         }
3283
3284         err = transport->set_iface_param(shost, data, len);
3285         scsi_host_put(shost);
3286         return err;
3287 }
3288
3289 static int
3290 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3291 {
3292         struct Scsi_Host *shost;
3293         struct sockaddr *dst_addr;
3294         int err;
3295
3296         if (rlen < sizeof(*dst_addr))
3297                 return -EINVAL;
3298
3299         if (!transport->send_ping)
3300                 return -ENOSYS;
3301
3302         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3303         if (!shost) {
3304                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3305                        ev->u.iscsi_ping.host_no);
3306                 return -ENODEV;
3307         }
3308
3309         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3310         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3311                                    ev->u.iscsi_ping.iface_type,
3312                                    ev->u.iscsi_ping.payload_size,
3313                                    ev->u.iscsi_ping.pid,
3314                                    dst_addr);
3315         scsi_host_put(shost);
3316         return err;
3317 }
3318
3319 static int
3320 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3321 {
3322         struct iscsi_uevent *ev = nlmsg_data(nlh);
3323         struct Scsi_Host *shost = NULL;
3324         struct iscsi_chap_rec *chap_rec;
3325         struct iscsi_internal *priv;
3326         struct sk_buff *skbchap;
3327         struct nlmsghdr *nlhchap;
3328         struct iscsi_uevent *evchap;
3329         uint32_t chap_buf_size;
3330         int len, err = 0;
3331         char *buf;
3332
3333         if (!transport->get_chap)
3334                 return -EINVAL;
3335
3336         priv = iscsi_if_transport_lookup(transport);
3337         if (!priv)
3338                 return -EINVAL;
3339
3340         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3341         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3342
3343         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3344         if (!shost) {
3345                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3346                        __func__, ev->u.get_chap.host_no);
3347                 return -ENODEV;
3348         }
3349
3350         do {
3351                 int actual_size;
3352
3353                 skbchap = alloc_skb(len, GFP_KERNEL);
3354                 if (!skbchap) {
3355                         printk(KERN_ERR "can not deliver chap: OOM\n");
3356                         err = -ENOMEM;
3357                         goto exit_get_chap;
3358                 }
3359
3360                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3361                                       (len - sizeof(*nlhchap)), 0);
3362                 evchap = nlmsg_data(nlhchap);
3363                 memset(evchap, 0, sizeof(*evchap));
3364                 evchap->transport_handle = iscsi_handle(transport);
3365                 evchap->type = nlh->nlmsg_type;
3366                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3367                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3368                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3369                 buf = (char *)evchap + sizeof(*evchap);
3370                 memset(buf, 0, chap_buf_size);
3371
3372                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3373                                     &evchap->u.get_chap.num_entries, buf);
3374
3375                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3376                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3377                 nlhchap->nlmsg_len = actual_size;
3378
3379                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3380                                           GFP_KERNEL);
3381         } while (err < 0 && err != -ECONNREFUSED);
3382
3383 exit_get_chap:
3384         scsi_host_put(shost);
3385         return err;
3386 }
3387
3388 static int iscsi_set_chap(struct iscsi_transport *transport,
3389                           struct iscsi_uevent *ev, uint32_t len)
3390 {
3391         char *data = (char *)ev + sizeof(*ev);
3392         struct Scsi_Host *shost;
3393         int err = 0;
3394
3395         if (!transport->set_chap)
3396                 return -ENOSYS;
3397
3398         shost = scsi_host_lookup(ev->u.set_path.host_no);
3399         if (!shost) {
3400                 pr_err("%s could not find host no %u\n",
3401                        __func__, ev->u.set_path.host_no);
3402                 return -ENODEV;
3403         }
3404
3405         err = transport->set_chap(shost, data, len);
3406         scsi_host_put(shost);
3407         return err;
3408 }
3409
3410 static int iscsi_delete_chap(struct iscsi_transport *transport,
3411                              struct iscsi_uevent *ev)
3412 {
3413         struct Scsi_Host *shost;
3414         int err = 0;
3415
3416         if (!transport->delete_chap)
3417                 return -ENOSYS;
3418
3419         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3420         if (!shost) {
3421                 printk(KERN_ERR "%s could not find host no %u\n",
3422                        __func__, ev->u.delete_chap.host_no);
3423                 return -ENODEV;
3424         }
3425
3426         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3427         scsi_host_put(shost);
3428         return err;
3429 }
3430
3431 static const struct {
3432         enum iscsi_discovery_parent_type value;
3433         char                            *name;
3434 } iscsi_discovery_parent_names[] = {
3435         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3436         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3437         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3438 };
3439
3440 char *iscsi_get_discovery_parent_name(int parent_type)
3441 {
3442         int i;
3443         char *state = "Unknown!";
3444
3445         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3446                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3447                         state = iscsi_discovery_parent_names[i].name;
3448                         break;
3449                 }
3450         }
3451         return state;
3452 }
3453 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3454
3455 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3456                                      struct iscsi_uevent *ev, uint32_t len)
3457 {
3458         char *data = (char *)ev + sizeof(*ev);
3459         struct Scsi_Host *shost;
3460         struct iscsi_bus_flash_session *fnode_sess;
3461         struct iscsi_bus_flash_conn *fnode_conn;
3462         struct device *dev;
3463         uint32_t idx;
3464         int err = 0;
3465
3466         if (!transport->set_flashnode_param) {
3467                 err = -ENOSYS;
3468                 goto exit_set_fnode;
3469         }
3470
3471         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3472         if (!shost) {
3473                 pr_err("%s could not find host no %u\n",
3474                        __func__, ev->u.set_flashnode.host_no);
3475                 err = -ENODEV;
3476                 goto exit_set_fnode;
3477         }
3478
3479         idx = ev->u.set_flashnode.flashnode_idx;
3480         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3481         if (!fnode_sess) {
3482                 pr_err("%s could not find flashnode %u for host no %u\n",
3483                        __func__, idx, ev->u.set_flashnode.host_no);
3484                 err = -ENODEV;
3485                 goto put_host;
3486         }
3487
3488         dev = iscsi_find_flashnode_conn(fnode_sess);
3489         if (!dev) {
3490                 err = -ENODEV;
3491                 goto put_sess;
3492         }
3493
3494         fnode_conn = iscsi_dev_to_flash_conn(dev);
3495         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3496         put_device(dev);
3497
3498 put_sess:
3499         put_device(&fnode_sess->dev);
3500
3501 put_host:
3502         scsi_host_put(shost);
3503
3504 exit_set_fnode:
3505         return err;
3506 }
3507
3508 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3509                                struct iscsi_uevent *ev, uint32_t len)
3510 {
3511         char *data = (char *)ev + sizeof(*ev);
3512         struct Scsi_Host *shost;
3513         int index;
3514         int err = 0;
3515
3516         if (!transport->new_flashnode) {
3517                 err = -ENOSYS;
3518                 goto exit_new_fnode;
3519         }
3520
3521         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3522         if (!shost) {
3523                 pr_err("%s could not find host no %u\n",
3524                        __func__, ev->u.new_flashnode.host_no);
3525                 err = -ENODEV;
3526                 goto put_host;
3527         }
3528
3529         index = transport->new_flashnode(shost, data, len);
3530
3531         if (index >= 0)
3532                 ev->r.new_flashnode_ret.flashnode_idx = index;
3533         else
3534                 err = -EIO;
3535
3536 put_host:
3537         scsi_host_put(shost);
3538
3539 exit_new_fnode:
3540         return err;
3541 }
3542
3543 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3544                                struct iscsi_uevent *ev)
3545 {
3546         struct Scsi_Host *shost;
3547         struct iscsi_bus_flash_session *fnode_sess;
3548         uint32_t idx;
3549         int err = 0;
3550
3551         if (!transport->del_flashnode) {
3552                 err = -ENOSYS;
3553                 goto exit_del_fnode;
3554         }
3555
3556         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3557         if (!shost) {
3558                 pr_err("%s could not find host no %u\n",
3559                        __func__, ev->u.del_flashnode.host_no);
3560                 err = -ENODEV;
3561                 goto put_host;
3562         }
3563
3564         idx = ev->u.del_flashnode.flashnode_idx;
3565         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3566         if (!fnode_sess) {
3567                 pr_err("%s could not find flashnode %u for host no %u\n",
3568                        __func__, idx, ev->u.del_flashnode.host_no);
3569                 err = -ENODEV;
3570                 goto put_host;
3571         }
3572
3573         err = transport->del_flashnode(fnode_sess);
3574         put_device(&fnode_sess->dev);
3575
3576 put_host:
3577         scsi_host_put(shost);
3578
3579 exit_del_fnode:
3580         return err;
3581 }
3582
3583 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3584                                  struct iscsi_uevent *ev)
3585 {
3586         struct Scsi_Host *shost;
3587         struct iscsi_bus_flash_session *fnode_sess;
3588         struct iscsi_bus_flash_conn *fnode_conn;
3589         struct device *dev;
3590         uint32_t idx;
3591         int err = 0;
3592
3593         if (!transport->login_flashnode) {
3594                 err = -ENOSYS;
3595                 goto exit_login_fnode;
3596         }
3597
3598         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3599         if (!shost) {
3600                 pr_err("%s could not find host no %u\n",
3601                        __func__, ev->u.login_flashnode.host_no);
3602                 err = -ENODEV;
3603                 goto put_host;
3604         }
3605
3606         idx = ev->u.login_flashnode.flashnode_idx;
3607         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3608         if (!fnode_sess) {
3609                 pr_err("%s could not find flashnode %u for host no %u\n",
3610                        __func__, idx, ev->u.login_flashnode.host_no);
3611                 err = -ENODEV;
3612                 goto put_host;
3613         }
3614
3615         dev = iscsi_find_flashnode_conn(fnode_sess);
3616         if (!dev) {
3617                 err = -ENODEV;
3618                 goto put_sess;
3619         }
3620
3621         fnode_conn = iscsi_dev_to_flash_conn(dev);
3622         err = transport->login_flashnode(fnode_sess, fnode_conn);
3623         put_device(dev);
3624
3625 put_sess:
3626         put_device(&fnode_sess->dev);
3627
3628 put_host:
3629         scsi_host_put(shost);
3630
3631 exit_login_fnode:
3632         return err;
3633 }
3634
3635 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3636                                   struct iscsi_uevent *ev)
3637 {
3638         struct Scsi_Host *shost;
3639         struct iscsi_bus_flash_session *fnode_sess;
3640         struct iscsi_bus_flash_conn *fnode_conn;
3641         struct device *dev;
3642         uint32_t idx;
3643         int err = 0;
3644
3645         if (!transport->logout_flashnode) {
3646                 err = -ENOSYS;
3647                 goto exit_logout_fnode;
3648         }
3649
3650         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3651         if (!shost) {
3652                 pr_err("%s could not find host no %u\n",
3653                        __func__, ev->u.logout_flashnode.host_no);
3654                 err = -ENODEV;
3655                 goto put_host;
3656         }
3657
3658         idx = ev->u.logout_flashnode.flashnode_idx;
3659         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3660         if (!fnode_sess) {
3661                 pr_err("%s could not find flashnode %u for host no %u\n",
3662                        __func__, idx, ev->u.logout_flashnode.host_no);
3663                 err = -ENODEV;
3664                 goto put_host;
3665         }
3666
3667         dev = iscsi_find_flashnode_conn(fnode_sess);
3668         if (!dev) {
3669                 err = -ENODEV;
3670                 goto put_sess;
3671         }
3672
3673         fnode_conn = iscsi_dev_to_flash_conn(dev);
3674
3675         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3676         put_device(dev);
3677
3678 put_sess:
3679         put_device(&fnode_sess->dev);
3680
3681 put_host:
3682         scsi_host_put(shost);
3683
3684 exit_logout_fnode:
3685         return err;
3686 }
3687
3688 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3689                                       struct iscsi_uevent *ev)
3690 {
3691         struct Scsi_Host *shost;
3692         struct iscsi_cls_session *session;
3693         int err = 0;
3694
3695         if (!transport->logout_flashnode_sid) {
3696                 err = -ENOSYS;
3697                 goto exit_logout_sid;
3698         }
3699
3700         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3701         if (!shost) {
3702                 pr_err("%s could not find host no %u\n",
3703                        __func__, ev->u.logout_flashnode.host_no);
3704                 err = -ENODEV;
3705                 goto put_host;
3706         }
3707
3708         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3709         if (!session) {
3710                 pr_err("%s could not find session id %u\n",
3711                        __func__, ev->u.logout_flashnode_sid.sid);
3712                 err = -EINVAL;
3713                 goto put_host;
3714         }
3715
3716         err = transport->logout_flashnode_sid(session);
3717
3718 put_host:
3719         scsi_host_put(shost);
3720
3721 exit_logout_sid:
3722         return err;
3723 }
3724
3725 static int
3726 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3727 {
3728         struct iscsi_uevent *ev = nlmsg_data(nlh);
3729         struct Scsi_Host *shost = NULL;
3730         struct iscsi_internal *priv;
3731         struct sk_buff *skbhost_stats;
3732         struct nlmsghdr *nlhhost_stats;
3733         struct iscsi_uevent *evhost_stats;
3734         int host_stats_size = 0;
3735         int len, err = 0;
3736         char *buf;
3737
3738         if (!transport->get_host_stats)
3739                 return -ENOSYS;
3740
3741         priv = iscsi_if_transport_lookup(transport);
3742         if (!priv)
3743                 return -EINVAL;
3744
3745         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3746         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3747
3748         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3749         if (!shost) {
3750                 pr_err("%s: failed. Could not find host no %u\n",
3751                        __func__, ev->u.get_host_stats.host_no);
3752                 return -ENODEV;
3753         }
3754
3755         do {
3756                 int actual_size;
3757
3758                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3759                 if (!skbhost_stats) {
3760                         pr_err("cannot deliver host stats: OOM\n");
3761                         err = -ENOMEM;
3762                         goto exit_host_stats;
3763                 }
3764
3765                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3766                                       (len - sizeof(*nlhhost_stats)), 0);
3767                 evhost_stats = nlmsg_data(nlhhost_stats);
3768                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3769                 evhost_stats->transport_handle = iscsi_handle(transport);
3770                 evhost_stats->type = nlh->nlmsg_type;
3771                 evhost_stats->u.get_host_stats.host_no =
3772                                         ev->u.get_host_stats.host_no;
3773                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3774                 memset(buf, 0, host_stats_size);
3775
3776                 err = transport->get_host_stats(shost, buf, host_stats_size);
3777                 if (err) {
3778                         kfree_skb(skbhost_stats);
3779                         goto exit_host_stats;
3780                 }
3781
3782                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3783                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3784                 nlhhost_stats->nlmsg_len = actual_size;
3785
3786                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3787                                           GFP_KERNEL);
3788         } while (err < 0 && err != -ECONNREFUSED);
3789
3790 exit_host_stats:
3791         scsi_host_put(shost);
3792         return err;
3793 }
3794
3795 static int iscsi_if_transport_conn(struct iscsi_transport *transport,
3796                                    struct nlmsghdr *nlh, u32 pdu_len)
3797 {
3798         struct iscsi_uevent *ev = nlmsg_data(nlh);
3799         struct iscsi_cls_session *session;
3800         struct iscsi_cls_conn *conn = NULL;
3801         struct iscsi_endpoint *ep;
3802         int err = 0;
3803
3804         switch (nlh->nlmsg_type) {
3805         case ISCSI_UEVENT_CREATE_CONN:
3806                 return iscsi_if_create_conn(transport, ev);
3807         case ISCSI_UEVENT_DESTROY_CONN:
3808                 return iscsi_if_destroy_conn(transport, ev);
3809         case ISCSI_UEVENT_STOP_CONN:
3810                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid,
3811                                          ev->u.stop_conn.cid);
3812                 if (!conn)
3813                         return -EINVAL;
3814
3815                 return iscsi_if_stop_conn(conn, ev->u.stop_conn.flag);
3816         }
3817
3818         /*
3819          * The following cmds need to be run under the ep_mutex so in kernel
3820          * conn cleanup (ep_disconnect + unbind and conn) is not done while
3821          * these are running. They also must not run if we have just run a conn
3822          * cleanup because they would set the state in a way that might allow
3823          * IO or send IO themselves.
3824          */
3825         switch (nlh->nlmsg_type) {
3826         case ISCSI_UEVENT_START_CONN:
3827                 conn = iscsi_conn_lookup(ev->u.start_conn.sid,
3828                                          ev->u.start_conn.cid);
3829                 break;
3830         case ISCSI_UEVENT_BIND_CONN:
3831                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3832                 break;
3833         case ISCSI_UEVENT_SEND_PDU:
3834                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3835                 break;
3836         }
3837
3838         if (!conn)
3839                 return -EINVAL;
3840
3841         mutex_lock(&conn->ep_mutex);
3842         spin_lock_irq(&conn->lock);
3843         if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3844                 spin_unlock_irq(&conn->lock);
3845                 mutex_unlock(&conn->ep_mutex);
3846                 ev->r.retcode = -ENOTCONN;
3847                 return 0;
3848         }
3849         spin_unlock_irq(&conn->lock);
3850
3851         switch (nlh->nlmsg_type) {
3852         case ISCSI_UEVENT_BIND_CONN:
3853                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3854                 if (!session) {
3855                         err = -EINVAL;
3856                         break;
3857                 }
3858
3859                 ev->r.retcode = transport->bind_conn(session, conn,
3860                                                 ev->u.b_conn.transport_eph,
3861                                                 ev->u.b_conn.is_leading);
3862                 if (!ev->r.retcode)
3863                         WRITE_ONCE(conn->state, ISCSI_CONN_BOUND);
3864
3865                 if (ev->r.retcode || !transport->ep_connect)
3866                         break;
3867
3868                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3869                 if (ep) {
3870                         ep->conn = conn;
3871                         conn->ep = ep;
3872                         iscsi_put_endpoint(ep);
3873                 } else {
3874                         err = -ENOTCONN;
3875                         iscsi_cls_conn_printk(KERN_ERR, conn,
3876                                               "Could not set ep conn binding\n");
3877                 }
3878                 break;
3879         case ISCSI_UEVENT_START_CONN:
3880                 ev->r.retcode = transport->start_conn(conn);
3881                 if (!ev->r.retcode)
3882                         WRITE_ONCE(conn->state, ISCSI_CONN_UP);
3883
3884                 break;
3885         case ISCSI_UEVENT_SEND_PDU:
3886                 if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3887                     (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3888                         err = -EINVAL;
3889                         break;
3890                 }
3891
3892                 ev->r.retcode = transport->send_pdu(conn,
3893                                 (struct iscsi_hdr *)((char *)ev + sizeof(*ev)),
3894                                 (char *)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3895                                 ev->u.send_pdu.data_size);
3896                 break;
3897         default:
3898                 err = -ENOSYS;
3899         }
3900
3901         mutex_unlock(&conn->ep_mutex);
3902         return err;
3903 }
3904
3905 static int
3906 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3907 {
3908         int err = 0;
3909         u32 portid;
3910         struct iscsi_uevent *ev = nlmsg_data(nlh);
3911         struct iscsi_transport *transport = NULL;
3912         struct iscsi_internal *priv;
3913         struct iscsi_cls_session *session;
3914         struct iscsi_endpoint *ep = NULL;
3915         u32 rlen;
3916
3917         if (!netlink_capable(skb, CAP_SYS_ADMIN))
3918                 return -EPERM;
3919
3920         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3921                 *group = ISCSI_NL_GRP_UIP;
3922         else
3923                 *group = ISCSI_NL_GRP_ISCSID;
3924
3925         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3926         if (!priv)
3927                 return -EINVAL;
3928         transport = priv->iscsi_transport;
3929
3930         if (!try_module_get(transport->owner))
3931                 return -EINVAL;
3932
3933         portid = NETLINK_CB(skb).portid;
3934
3935         /*
3936          * Even though the remaining payload may not be regarded as nlattr,
3937          * (like address or something else), calculate the remaining length
3938          * here to ease following length checks.
3939          */
3940         rlen = nlmsg_attrlen(nlh, sizeof(*ev));
3941
3942         switch (nlh->nlmsg_type) {
3943         case ISCSI_UEVENT_CREATE_SESSION:
3944                 err = iscsi_if_create_session(priv, ep, ev,
3945                                               portid,
3946                                               ev->u.c_session.initial_cmdsn,
3947                                               ev->u.c_session.cmds_max,
3948                                               ev->u.c_session.queue_depth);
3949                 break;
3950         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3951                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3952                 if (!ep) {
3953                         err = -EINVAL;
3954                         break;
3955                 }
3956
3957                 err = iscsi_if_create_session(priv, ep, ev,
3958                                         portid,
3959                                         ev->u.c_bound_session.initial_cmdsn,
3960                                         ev->u.c_bound_session.cmds_max,
3961                                         ev->u.c_bound_session.queue_depth);
3962                 iscsi_put_endpoint(ep);
3963                 break;
3964         case ISCSI_UEVENT_DESTROY_SESSION:
3965                 session = iscsi_session_lookup(ev->u.d_session.sid);
3966                 if (!session)
3967                         err = -EINVAL;
3968                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3969                         err = -EBUSY;
3970                 else
3971                         transport->destroy_session(session);
3972                 break;
3973         case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3974                 session = iscsi_session_lookup(ev->u.d_session.sid);
3975                 if (!session)
3976                         err = -EINVAL;
3977                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3978                         err = -EBUSY;
3979                 else {
3980                         unsigned long flags;
3981
3982                         /* Prevent this session from being found again */
3983                         spin_lock_irqsave(&sesslock, flags);
3984                         list_del_init(&session->sess_list);
3985                         spin_unlock_irqrestore(&sesslock, flags);
3986
3987                         queue_work(system_unbound_wq, &session->destroy_work);
3988                 }
3989                 break;
3990         case ISCSI_UEVENT_UNBIND_SESSION:
3991                 session = iscsi_session_lookup(ev->u.d_session.sid);
3992                 if (session)
3993                         queue_work(session->workq, &session->unbind_work);
3994                 else
3995                         err = -EINVAL;
3996                 break;
3997         case ISCSI_UEVENT_SET_PARAM:
3998                 err = iscsi_if_set_param(transport, ev, rlen);
3999                 break;
4000         case ISCSI_UEVENT_CREATE_CONN:
4001         case ISCSI_UEVENT_DESTROY_CONN:
4002         case ISCSI_UEVENT_STOP_CONN:
4003         case ISCSI_UEVENT_START_CONN:
4004         case ISCSI_UEVENT_BIND_CONN:
4005         case ISCSI_UEVENT_SEND_PDU:
4006                 err = iscsi_if_transport_conn(transport, nlh, rlen);
4007                 break;
4008         case ISCSI_UEVENT_GET_STATS:
4009                 err = iscsi_if_get_stats(transport, nlh);
4010                 break;
4011         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
4012         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
4013         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
4014         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
4015                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type, rlen);
4016                 break;
4017         case ISCSI_UEVENT_TGT_DSCVR:
4018                 err = iscsi_tgt_dscvr(transport, ev, rlen);
4019                 break;
4020         case ISCSI_UEVENT_SET_HOST_PARAM:
4021                 err = iscsi_set_host_param(transport, ev, rlen);
4022                 break;
4023         case ISCSI_UEVENT_PATH_UPDATE:
4024                 err = iscsi_set_path(transport, ev, rlen);
4025                 break;
4026         case ISCSI_UEVENT_SET_IFACE_PARAMS:
4027                 err = iscsi_set_iface_params(transport, ev, rlen);
4028                 break;
4029         case ISCSI_UEVENT_PING:
4030                 err = iscsi_send_ping(transport, ev, rlen);
4031                 break;
4032         case ISCSI_UEVENT_GET_CHAP:
4033                 err = iscsi_get_chap(transport, nlh);
4034                 break;
4035         case ISCSI_UEVENT_DELETE_CHAP:
4036                 err = iscsi_delete_chap(transport, ev);
4037                 break;
4038         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
4039                 err = iscsi_set_flashnode_param(transport, ev, rlen);
4040                 break;
4041         case ISCSI_UEVENT_NEW_FLASHNODE:
4042                 err = iscsi_new_flashnode(transport, ev, rlen);
4043                 break;
4044         case ISCSI_UEVENT_DEL_FLASHNODE:
4045                 err = iscsi_del_flashnode(transport, ev);
4046                 break;
4047         case ISCSI_UEVENT_LOGIN_FLASHNODE:
4048                 err = iscsi_login_flashnode(transport, ev);
4049                 break;
4050         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
4051                 err = iscsi_logout_flashnode(transport, ev);
4052                 break;
4053         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
4054                 err = iscsi_logout_flashnode_sid(transport, ev);
4055                 break;
4056         case ISCSI_UEVENT_SET_CHAP:
4057                 err = iscsi_set_chap(transport, ev, rlen);
4058                 break;
4059         case ISCSI_UEVENT_GET_HOST_STATS:
4060                 err = iscsi_get_host_stats(transport, nlh);
4061                 break;
4062         default:
4063                 err = -ENOSYS;
4064                 break;
4065         }
4066
4067         module_put(transport->owner);
4068         return err;
4069 }
4070
4071 /*
4072  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
4073  * Malformed skbs with wrong lengths or invalid creds are not processed.
4074  */
4075 static void
4076 iscsi_if_rx(struct sk_buff *skb)
4077 {
4078         u32 portid = NETLINK_CB(skb).portid;
4079
4080         mutex_lock(&rx_queue_mutex);
4081         while (skb->len >= NLMSG_HDRLEN) {
4082                 int err;
4083                 uint32_t rlen;
4084                 struct nlmsghdr *nlh;
4085                 struct iscsi_uevent *ev;
4086                 uint32_t group;
4087                 int retries = ISCSI_SEND_MAX_ALLOWED;
4088
4089                 nlh = nlmsg_hdr(skb);
4090                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
4091                     skb->len < nlh->nlmsg_len) {
4092                         break;
4093                 }
4094
4095                 ev = nlmsg_data(nlh);
4096                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
4097                 if (rlen > skb->len)
4098                         rlen = skb->len;
4099
4100                 err = iscsi_if_recv_msg(skb, nlh, &group);
4101                 if (err) {
4102                         ev->type = ISCSI_KEVENT_IF_ERROR;
4103                         ev->iferror = err;
4104                 }
4105                 do {
4106                         /*
4107                          * special case for GET_STATS:
4108                          * on success - sending reply and stats from
4109                          * inside of if_recv_msg(),
4110                          * on error - fall through.
4111                          */
4112                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
4113                                 break;
4114                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
4115                                 break;
4116                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
4117                                                   ev, sizeof(*ev));
4118                         if (err == -EAGAIN && --retries < 0) {
4119                                 printk(KERN_WARNING "Send reply failed, error %d\n", err);
4120                                 break;
4121                         }
4122                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
4123                 skb_pull(skb, rlen);
4124         }
4125         mutex_unlock(&rx_queue_mutex);
4126 }
4127
4128 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
4129 struct device_attribute dev_attr_##_prefix##_##_name =  \
4130         __ATTR(_name,_mode,_show,_store)
4131
4132 /*
4133  * iSCSI connection attrs
4134  */
4135 #define iscsi_conn_attr_show(param)                                     \
4136 static ssize_t                                                          \
4137 show_conn_param_##param(struct device *dev,                             \
4138                         struct device_attribute *attr, char *buf)       \
4139 {                                                                       \
4140         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4141         struct iscsi_transport *t = conn->transport;                    \
4142         return t->get_conn_param(conn, param, buf);                     \
4143 }
4144
4145 #define iscsi_conn_attr(field, param)                                   \
4146         iscsi_conn_attr_show(param)                                     \
4147 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
4148                         NULL);
4149
4150 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
4151 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
4152 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
4153 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
4154 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
4155 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
4156 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
4157 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
4158 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
4159 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
4160 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
4161 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
4162 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
4163 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
4164 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
4165 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
4166 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
4167 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
4168 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
4169 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
4170 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
4171 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
4172 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
4173 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
4174 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
4175 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
4176 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
4177 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
4178
4179 static const char *const connection_state_names[] = {
4180         [ISCSI_CONN_UP] = "up",
4181         [ISCSI_CONN_DOWN] = "down",
4182         [ISCSI_CONN_FAILED] = "failed",
4183         [ISCSI_CONN_BOUND] = "bound"
4184 };
4185
4186 static ssize_t show_conn_state(struct device *dev,
4187                                struct device_attribute *attr, char *buf)
4188 {
4189         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
4190         const char *state = "unknown";
4191         int conn_state = READ_ONCE(conn->state);
4192
4193         if (conn_state >= 0 &&
4194             conn_state < ARRAY_SIZE(connection_state_names))
4195                 state = connection_state_names[conn_state];
4196
4197         return sysfs_emit(buf, "%s\n", state);
4198 }
4199 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
4200                         NULL);
4201
4202 #define iscsi_conn_ep_attr_show(param)                                  \
4203 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
4204                                           struct device_attribute *attr,\
4205                                           char *buf)                    \
4206 {                                                                       \
4207         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4208         struct iscsi_transport *t = conn->transport;                    \
4209         struct iscsi_endpoint *ep;                                      \
4210         ssize_t rc;                                                     \
4211                                                                         \
4212         /*                                                              \
4213          * Need to make sure ep_disconnect does not free the LLD's      \
4214          * interconnect resources while we are trying to read them.     \
4215          */                                                             \
4216         mutex_lock(&conn->ep_mutex);                                    \
4217         ep = conn->ep;                                                  \
4218         if (!ep && t->ep_connect) {                                     \
4219                 mutex_unlock(&conn->ep_mutex);                          \
4220                 return -ENOTCONN;                                       \
4221         }                                                               \
4222                                                                         \
4223         if (ep)                                                         \
4224                 rc = t->get_ep_param(ep, param, buf);                   \
4225         else                                                            \
4226                 rc = t->get_conn_param(conn, param, buf);               \
4227         mutex_unlock(&conn->ep_mutex);                                  \
4228         return rc;                                                      \
4229 }
4230
4231 #define iscsi_conn_ep_attr(field, param)                                \
4232         iscsi_conn_ep_attr_show(param)                                  \
4233 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
4234                         show_conn_ep_param_##param, NULL);
4235
4236 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4237 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4238
4239 static struct attribute *iscsi_conn_attrs[] = {
4240         &dev_attr_conn_max_recv_dlength.attr,
4241         &dev_attr_conn_max_xmit_dlength.attr,
4242         &dev_attr_conn_header_digest.attr,
4243         &dev_attr_conn_data_digest.attr,
4244         &dev_attr_conn_ifmarker.attr,
4245         &dev_attr_conn_ofmarker.attr,
4246         &dev_attr_conn_address.attr,
4247         &dev_attr_conn_port.attr,
4248         &dev_attr_conn_exp_statsn.attr,
4249         &dev_attr_conn_persistent_address.attr,
4250         &dev_attr_conn_persistent_port.attr,
4251         &dev_attr_conn_ping_tmo.attr,
4252         &dev_attr_conn_recv_tmo.attr,
4253         &dev_attr_conn_local_port.attr,
4254         &dev_attr_conn_statsn.attr,
4255         &dev_attr_conn_keepalive_tmo.attr,
4256         &dev_attr_conn_max_segment_size.attr,
4257         &dev_attr_conn_tcp_timestamp_stat.attr,
4258         &dev_attr_conn_tcp_wsf_disable.attr,
4259         &dev_attr_conn_tcp_nagle_disable.attr,
4260         &dev_attr_conn_tcp_timer_scale.attr,
4261         &dev_attr_conn_tcp_timestamp_enable.attr,
4262         &dev_attr_conn_fragment_disable.attr,
4263         &dev_attr_conn_ipv4_tos.attr,
4264         &dev_attr_conn_ipv6_traffic_class.attr,
4265         &dev_attr_conn_ipv6_flow_label.attr,
4266         &dev_attr_conn_is_fw_assigned_ipv6.attr,
4267         &dev_attr_conn_tcp_xmit_wsf.attr,
4268         &dev_attr_conn_tcp_recv_wsf.attr,
4269         &dev_attr_conn_local_ipaddr.attr,
4270         &dev_attr_conn_state.attr,
4271         NULL,
4272 };
4273
4274 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4275                                          struct attribute *attr, int i)
4276 {
4277         struct device *cdev = container_of(kobj, struct device, kobj);
4278         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4279         struct iscsi_transport *t = conn->transport;
4280         int param;
4281
4282         if (attr == &dev_attr_conn_max_recv_dlength.attr)
4283                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4284         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4285                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4286         else if (attr == &dev_attr_conn_header_digest.attr)
4287                 param = ISCSI_PARAM_HDRDGST_EN;
4288         else if (attr == &dev_attr_conn_data_digest.attr)
4289                 param = ISCSI_PARAM_DATADGST_EN;
4290         else if (attr == &dev_attr_conn_ifmarker.attr)
4291                 param = ISCSI_PARAM_IFMARKER_EN;
4292         else if (attr == &dev_attr_conn_ofmarker.attr)
4293                 param = ISCSI_PARAM_OFMARKER_EN;
4294         else if (attr == &dev_attr_conn_address.attr)
4295                 param = ISCSI_PARAM_CONN_ADDRESS;
4296         else if (attr == &dev_attr_conn_port.attr)
4297                 param = ISCSI_PARAM_CONN_PORT;
4298         else if (attr == &dev_attr_conn_exp_statsn.attr)
4299                 param = ISCSI_PARAM_EXP_STATSN;
4300         else if (attr == &dev_attr_conn_persistent_address.attr)
4301                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4302         else if (attr == &dev_attr_conn_persistent_port.attr)
4303                 param = ISCSI_PARAM_PERSISTENT_PORT;
4304         else if (attr == &dev_attr_conn_ping_tmo.attr)
4305                 param = ISCSI_PARAM_PING_TMO;
4306         else if (attr == &dev_attr_conn_recv_tmo.attr)
4307                 param = ISCSI_PARAM_RECV_TMO;
4308         else if (attr == &dev_attr_conn_local_port.attr)
4309                 param = ISCSI_PARAM_LOCAL_PORT;
4310         else if (attr == &dev_attr_conn_statsn.attr)
4311                 param = ISCSI_PARAM_STATSN;
4312         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4313                 param = ISCSI_PARAM_KEEPALIVE_TMO;
4314         else if (attr == &dev_attr_conn_max_segment_size.attr)
4315                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4316         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4317                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4318         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4319                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
4320         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4321                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4322         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4323                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
4324         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4325                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4326         else if (attr == &dev_attr_conn_fragment_disable.attr)
4327                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4328         else if (attr == &dev_attr_conn_ipv4_tos.attr)
4329                 param = ISCSI_PARAM_IPV4_TOS;
4330         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4331                 param = ISCSI_PARAM_IPV6_TC;
4332         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4333                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4334         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4335                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4336         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4337                 param = ISCSI_PARAM_TCP_XMIT_WSF;
4338         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4339                 param = ISCSI_PARAM_TCP_RECV_WSF;
4340         else if (attr == &dev_attr_conn_local_ipaddr.attr)
4341                 param = ISCSI_PARAM_LOCAL_IPADDR;
4342         else if (attr == &dev_attr_conn_state.attr)
4343                 return S_IRUGO;
4344         else {
4345                 WARN_ONCE(1, "Invalid conn attr");
4346                 return 0;
4347         }
4348
4349         return t->attr_is_visible(ISCSI_PARAM, param);
4350 }
4351
4352 static struct attribute_group iscsi_conn_group = {
4353         .attrs = iscsi_conn_attrs,
4354         .is_visible = iscsi_conn_attr_is_visible,
4355 };
4356
4357 /*
4358  * iSCSI session attrs
4359  */
4360 #define iscsi_session_attr_show(param, perm)                            \
4361 static ssize_t                                                          \
4362 show_session_param_##param(struct device *dev,                          \
4363                            struct device_attribute *attr, char *buf)    \
4364 {                                                                       \
4365         struct iscsi_cls_session *session =                             \
4366                 iscsi_dev_to_session(dev->parent);                      \
4367         struct iscsi_transport *t = session->transport;                 \
4368                                                                         \
4369         if (perm && !capable(CAP_SYS_ADMIN))                            \
4370                 return -EACCES;                                         \
4371         return t->get_session_param(session, param, buf);               \
4372 }
4373
4374 #define iscsi_session_attr(field, param, perm)                          \
4375         iscsi_session_attr_show(param, perm)                            \
4376 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4377                         NULL);
4378 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4379 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4380 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4381 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4382 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4383 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4384 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4385 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4386 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4387 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4388 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4389 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4390 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4391 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4392 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4393 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4394 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4395 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4396 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4397 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4398 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4399 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4400 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4401 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4402 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4403 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4404 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4405 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4406 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4407 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4408 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4409 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4410 iscsi_session_attr(discovery_auth_optional,
4411                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4412 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4413 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4414 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4415 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4416 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4417 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4418 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4419
4420 static ssize_t
4421 show_priv_session_target_state(struct device *dev, struct device_attribute *attr,
4422                         char *buf)
4423 {
4424         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4425
4426         return sysfs_emit(buf, "%s\n",
4427                         iscsi_session_target_state_name[session->target_state]);
4428 }
4429
4430 static ISCSI_CLASS_ATTR(priv_sess, target_state, S_IRUGO,
4431                         show_priv_session_target_state, NULL);
4432
4433 static ssize_t
4434 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4435                         char *buf)
4436 {
4437         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4438         return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4439 }
4440 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4441                         NULL);
4442 static ssize_t
4443 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4444                         char *buf)
4445 {
4446         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4447         return sysfs_emit(buf, "%d\n", session->creator);
4448 }
4449 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4450                         NULL);
4451 static ssize_t
4452 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4453                             char *buf)
4454 {
4455         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4456         return sysfs_emit(buf, "%d\n", session->target_id);
4457 }
4458 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4459                         show_priv_session_target_id, NULL);
4460
4461 #define iscsi_priv_session_attr_show(field, format)                     \
4462 static ssize_t                                                          \
4463 show_priv_session_##field(struct device *dev,                           \
4464                           struct device_attribute *attr, char *buf)     \
4465 {                                                                       \
4466         struct iscsi_cls_session *session =                             \
4467                         iscsi_dev_to_session(dev->parent);              \
4468         if (session->field == -1)                                       \
4469                 return sysfs_emit(buf, "off\n");                        \
4470         return sysfs_emit(buf, format"\n", session->field);             \
4471 }
4472
4473 #define iscsi_priv_session_attr_store(field)                            \
4474 static ssize_t                                                          \
4475 store_priv_session_##field(struct device *dev,                          \
4476                            struct device_attribute *attr,               \
4477                            const char *buf, size_t count)               \
4478 {                                                                       \
4479         int val;                                                        \
4480         char *cp;                                                       \
4481         struct iscsi_cls_session *session =                             \
4482                 iscsi_dev_to_session(dev->parent);                      \
4483         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4484             (session->state == ISCSI_SESSION_FAILED))                   \
4485                 return -EBUSY;                                          \
4486         if (strncmp(buf, "off", 3) == 0) {                              \
4487                 session->field = -1;                                    \
4488                 session->field##_sysfs_override = true;                 \
4489         } else {                                                        \
4490                 val = simple_strtoul(buf, &cp, 0);                      \
4491                 if (*cp != '\0' && *cp != '\n')                         \
4492                         return -EINVAL;                                 \
4493                 session->field = val;                                   \
4494                 session->field##_sysfs_override = true;                 \
4495         }                                                               \
4496         return count;                                                   \
4497 }
4498
4499 #define iscsi_priv_session_rw_attr(field, format)                       \
4500         iscsi_priv_session_attr_show(field, format)                     \
4501         iscsi_priv_session_attr_store(field)                            \
4502 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4503                         show_priv_session_##field,                      \
4504                         store_priv_session_##field)
4505
4506 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4507
4508 static struct attribute *iscsi_session_attrs[] = {
4509         &dev_attr_sess_initial_r2t.attr,
4510         &dev_attr_sess_max_outstanding_r2t.attr,
4511         &dev_attr_sess_immediate_data.attr,
4512         &dev_attr_sess_first_burst_len.attr,
4513         &dev_attr_sess_max_burst_len.attr,
4514         &dev_attr_sess_data_pdu_in_order.attr,
4515         &dev_attr_sess_data_seq_in_order.attr,
4516         &dev_attr_sess_erl.attr,
4517         &dev_attr_sess_targetname.attr,
4518         &dev_attr_sess_tpgt.attr,
4519         &dev_attr_sess_password.attr,
4520         &dev_attr_sess_password_in.attr,
4521         &dev_attr_sess_username.attr,
4522         &dev_attr_sess_username_in.attr,
4523         &dev_attr_sess_fast_abort.attr,
4524         &dev_attr_sess_abort_tmo.attr,
4525         &dev_attr_sess_lu_reset_tmo.attr,
4526         &dev_attr_sess_tgt_reset_tmo.attr,
4527         &dev_attr_sess_ifacename.attr,
4528         &dev_attr_sess_initiatorname.attr,
4529         &dev_attr_sess_targetalias.attr,
4530         &dev_attr_sess_boot_root.attr,
4531         &dev_attr_sess_boot_nic.attr,
4532         &dev_attr_sess_boot_target.attr,
4533         &dev_attr_priv_sess_recovery_tmo.attr,
4534         &dev_attr_priv_sess_state.attr,
4535         &dev_attr_priv_sess_target_state.attr,
4536         &dev_attr_priv_sess_creator.attr,
4537         &dev_attr_sess_chap_out_idx.attr,
4538         &dev_attr_sess_chap_in_idx.attr,
4539         &dev_attr_priv_sess_target_id.attr,
4540         &dev_attr_sess_auto_snd_tgt_disable.attr,
4541         &dev_attr_sess_discovery_session.attr,
4542         &dev_attr_sess_portal_type.attr,
4543         &dev_attr_sess_chap_auth.attr,
4544         &dev_attr_sess_discovery_logout.attr,
4545         &dev_attr_sess_bidi_chap.attr,
4546         &dev_attr_sess_discovery_auth_optional.attr,
4547         &dev_attr_sess_def_time2wait.attr,
4548         &dev_attr_sess_def_time2retain.attr,
4549         &dev_attr_sess_isid.attr,
4550         &dev_attr_sess_tsid.attr,
4551         &dev_attr_sess_def_taskmgmt_tmo.attr,
4552         &dev_attr_sess_discovery_parent_idx.attr,
4553         &dev_attr_sess_discovery_parent_type.attr,
4554         NULL,
4555 };
4556
4557 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4558                                             struct attribute *attr, int i)
4559 {
4560         struct device *cdev = container_of(kobj, struct device, kobj);
4561         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4562         struct iscsi_transport *t = session->transport;
4563         int param;
4564
4565         if (attr == &dev_attr_sess_initial_r2t.attr)
4566                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4567         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4568                 param = ISCSI_PARAM_MAX_R2T;
4569         else if (attr == &dev_attr_sess_immediate_data.attr)
4570                 param = ISCSI_PARAM_IMM_DATA_EN;
4571         else if (attr == &dev_attr_sess_first_burst_len.attr)
4572                 param = ISCSI_PARAM_FIRST_BURST;
4573         else if (attr == &dev_attr_sess_max_burst_len.attr)
4574                 param = ISCSI_PARAM_MAX_BURST;
4575         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4576                 param = ISCSI_PARAM_PDU_INORDER_EN;
4577         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4578                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4579         else if (attr == &dev_attr_sess_erl.attr)
4580                 param = ISCSI_PARAM_ERL;
4581         else if (attr == &dev_attr_sess_targetname.attr)
4582                 param = ISCSI_PARAM_TARGET_NAME;
4583         else if (attr == &dev_attr_sess_tpgt.attr)
4584                 param = ISCSI_PARAM_TPGT;
4585         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4586                 param = ISCSI_PARAM_CHAP_IN_IDX;
4587         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4588                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4589         else if (attr == &dev_attr_sess_password.attr)
4590                 param = ISCSI_PARAM_USERNAME;
4591         else if (attr == &dev_attr_sess_password_in.attr)
4592                 param = ISCSI_PARAM_USERNAME_IN;
4593         else if (attr == &dev_attr_sess_username.attr)
4594                 param = ISCSI_PARAM_PASSWORD;
4595         else if (attr == &dev_attr_sess_username_in.attr)
4596                 param = ISCSI_PARAM_PASSWORD_IN;
4597         else if (attr == &dev_attr_sess_fast_abort.attr)
4598                 param = ISCSI_PARAM_FAST_ABORT;
4599         else if (attr == &dev_attr_sess_abort_tmo.attr)
4600                 param = ISCSI_PARAM_ABORT_TMO;
4601         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4602                 param = ISCSI_PARAM_LU_RESET_TMO;
4603         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4604                 param = ISCSI_PARAM_TGT_RESET_TMO;
4605         else if (attr == &dev_attr_sess_ifacename.attr)
4606                 param = ISCSI_PARAM_IFACE_NAME;
4607         else if (attr == &dev_attr_sess_initiatorname.attr)
4608                 param = ISCSI_PARAM_INITIATOR_NAME;
4609         else if (attr == &dev_attr_sess_targetalias.attr)
4610                 param = ISCSI_PARAM_TARGET_ALIAS;
4611         else if (attr == &dev_attr_sess_boot_root.attr)
4612                 param = ISCSI_PARAM_BOOT_ROOT;
4613         else if (attr == &dev_attr_sess_boot_nic.attr)
4614                 param = ISCSI_PARAM_BOOT_NIC;
4615         else if (attr == &dev_attr_sess_boot_target.attr)
4616                 param = ISCSI_PARAM_BOOT_TARGET;
4617         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4618                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4619         else if (attr == &dev_attr_sess_discovery_session.attr)
4620                 param = ISCSI_PARAM_DISCOVERY_SESS;
4621         else if (attr == &dev_attr_sess_portal_type.attr)
4622                 param = ISCSI_PARAM_PORTAL_TYPE;
4623         else if (attr == &dev_attr_sess_chap_auth.attr)
4624                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4625         else if (attr == &dev_attr_sess_discovery_logout.attr)
4626                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4627         else if (attr == &dev_attr_sess_bidi_chap.attr)
4628                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4629         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4630                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4631         else if (attr == &dev_attr_sess_def_time2wait.attr)
4632                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4633         else if (attr == &dev_attr_sess_def_time2retain.attr)
4634                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4635         else if (attr == &dev_attr_sess_isid.attr)
4636                 param = ISCSI_PARAM_ISID;
4637         else if (attr == &dev_attr_sess_tsid.attr)
4638                 param = ISCSI_PARAM_TSID;
4639         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4640                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4641         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4642                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4643         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4644                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4645         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4646                 return S_IRUGO | S_IWUSR;
4647         else if (attr == &dev_attr_priv_sess_state.attr)
4648                 return S_IRUGO;
4649         else if (attr == &dev_attr_priv_sess_target_state.attr)
4650                 return S_IRUGO;
4651         else if (attr == &dev_attr_priv_sess_creator.attr)
4652                 return S_IRUGO;
4653         else if (attr == &dev_attr_priv_sess_target_id.attr)
4654                 return S_IRUGO;
4655         else {
4656                 WARN_ONCE(1, "Invalid session attr");
4657                 return 0;
4658         }
4659
4660         return t->attr_is_visible(ISCSI_PARAM, param);
4661 }
4662
4663 static struct attribute_group iscsi_session_group = {
4664         .attrs = iscsi_session_attrs,
4665         .is_visible = iscsi_session_attr_is_visible,
4666 };
4667
4668 /*
4669  * iSCSI host attrs
4670  */
4671 #define iscsi_host_attr_show(param)                                     \
4672 static ssize_t                                                          \
4673 show_host_param_##param(struct device *dev,                             \
4674                         struct device_attribute *attr, char *buf)       \
4675 {                                                                       \
4676         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4677         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4678         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4679 }
4680
4681 #define iscsi_host_attr(field, param)                                   \
4682         iscsi_host_attr_show(param)                                     \
4683 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4684                         NULL);
4685
4686 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4687 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4688 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4689 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4690 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4691 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4692
4693 static struct attribute *iscsi_host_attrs[] = {
4694         &dev_attr_host_netdev.attr,
4695         &dev_attr_host_hwaddress.attr,
4696         &dev_attr_host_ipaddress.attr,
4697         &dev_attr_host_initiatorname.attr,
4698         &dev_attr_host_port_state.attr,
4699         &dev_attr_host_port_speed.attr,
4700         NULL,
4701 };
4702
4703 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4704                                          struct attribute *attr, int i)
4705 {
4706         struct device *cdev = container_of(kobj, struct device, kobj);
4707         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4708         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4709         int param;
4710
4711         if (attr == &dev_attr_host_netdev.attr)
4712                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4713         else if (attr == &dev_attr_host_hwaddress.attr)
4714                 param = ISCSI_HOST_PARAM_HWADDRESS;
4715         else if (attr == &dev_attr_host_ipaddress.attr)
4716                 param = ISCSI_HOST_PARAM_IPADDRESS;
4717         else if (attr == &dev_attr_host_initiatorname.attr)
4718                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4719         else if (attr == &dev_attr_host_port_state.attr)
4720                 param = ISCSI_HOST_PARAM_PORT_STATE;
4721         else if (attr == &dev_attr_host_port_speed.attr)
4722                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4723         else {
4724                 WARN_ONCE(1, "Invalid host attr");
4725                 return 0;
4726         }
4727
4728         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4729 }
4730
4731 static struct attribute_group iscsi_host_group = {
4732         .attrs = iscsi_host_attrs,
4733         .is_visible = iscsi_host_attr_is_visible,
4734 };
4735
4736 /* convert iscsi_port_speed values to ascii string name */
4737 static const struct {
4738         enum iscsi_port_speed   value;
4739         char                    *name;
4740 } iscsi_port_speed_names[] = {
4741         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4742         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4743         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4744         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4745         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4746         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4747         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4748 };
4749
4750 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4751 {
4752         int i;
4753         char *speed = "Unknown!";
4754         struct iscsi_cls_host *ihost = shost->shost_data;
4755         uint32_t port_speed = ihost->port_speed;
4756
4757         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4758                 if (iscsi_port_speed_names[i].value & port_speed) {
4759                         speed = iscsi_port_speed_names[i].name;
4760                         break;
4761                 }
4762         }
4763         return speed;
4764 }
4765 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4766
4767 /* convert iscsi_port_state values to ascii string name */
4768 static const struct {
4769         enum iscsi_port_state   value;
4770         char                    *name;
4771 } iscsi_port_state_names[] = {
4772         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4773         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4774 };
4775
4776 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4777 {
4778         int i;
4779         char *state = "Unknown!";
4780         struct iscsi_cls_host *ihost = shost->shost_data;
4781         uint32_t port_state = ihost->port_state;
4782
4783         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4784                 if (iscsi_port_state_names[i].value & port_state) {
4785                         state = iscsi_port_state_names[i].name;
4786                         break;
4787                 }
4788         }
4789         return state;
4790 }
4791 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4792
4793 static int iscsi_session_match(struct attribute_container *cont,
4794                            struct device *dev)
4795 {
4796         struct iscsi_cls_session *session;
4797         struct Scsi_Host *shost;
4798         struct iscsi_internal *priv;
4799
4800         if (!iscsi_is_session_dev(dev))
4801                 return 0;
4802
4803         session = iscsi_dev_to_session(dev);
4804         shost = iscsi_session_to_shost(session);
4805         if (!shost->transportt)
4806                 return 0;
4807
4808         priv = to_iscsi_internal(shost->transportt);
4809         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4810                 return 0;
4811
4812         return &priv->session_cont.ac == cont;
4813 }
4814
4815 static int iscsi_conn_match(struct attribute_container *cont,
4816                            struct device *dev)
4817 {
4818         struct iscsi_cls_session *session;
4819         struct iscsi_cls_conn *conn;
4820         struct Scsi_Host *shost;
4821         struct iscsi_internal *priv;
4822
4823         if (!iscsi_is_conn_dev(dev))
4824                 return 0;
4825
4826         conn = iscsi_dev_to_conn(dev);
4827         session = iscsi_dev_to_session(conn->dev.parent);
4828         shost = iscsi_session_to_shost(session);
4829
4830         if (!shost->transportt)
4831                 return 0;
4832
4833         priv = to_iscsi_internal(shost->transportt);
4834         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4835                 return 0;
4836
4837         return &priv->conn_cont.ac == cont;
4838 }
4839
4840 static int iscsi_host_match(struct attribute_container *cont,
4841                             struct device *dev)
4842 {
4843         struct Scsi_Host *shost;
4844         struct iscsi_internal *priv;
4845
4846         if (!scsi_is_host_device(dev))
4847                 return 0;
4848
4849         shost = dev_to_shost(dev);
4850         if (!shost->transportt  ||
4851             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4852                 return 0;
4853
4854         priv = to_iscsi_internal(shost->transportt);
4855         return &priv->t.host_attrs.ac == cont;
4856 }
4857
4858 struct scsi_transport_template *
4859 iscsi_register_transport(struct iscsi_transport *tt)
4860 {
4861         struct iscsi_internal *priv;
4862         unsigned long flags;
4863         int err;
4864
4865         BUG_ON(!tt);
4866         WARN_ON(tt->ep_disconnect && !tt->unbind_conn);
4867
4868         priv = iscsi_if_transport_lookup(tt);
4869         if (priv)
4870                 return NULL;
4871
4872         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4873         if (!priv)
4874                 return NULL;
4875         INIT_LIST_HEAD(&priv->list);
4876         priv->iscsi_transport = tt;
4877         priv->t.user_scan = iscsi_user_scan;
4878
4879         priv->dev.class = &iscsi_transport_class;
4880         dev_set_name(&priv->dev, "%s", tt->name);
4881         err = device_register(&priv->dev);
4882         if (err)
4883                 goto put_dev;
4884
4885         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4886         if (err)
4887                 goto unregister_dev;
4888
4889         /* host parameters */
4890         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4891         priv->t.host_attrs.ac.match = iscsi_host_match;
4892         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4893         priv->t.host_size = sizeof(struct iscsi_cls_host);
4894         transport_container_register(&priv->t.host_attrs);
4895
4896         /* connection parameters */
4897         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4898         priv->conn_cont.ac.match = iscsi_conn_match;
4899         priv->conn_cont.ac.grp = &iscsi_conn_group;
4900         transport_container_register(&priv->conn_cont);
4901
4902         /* session parameters */
4903         priv->session_cont.ac.class = &iscsi_session_class.class;
4904         priv->session_cont.ac.match = iscsi_session_match;
4905         priv->session_cont.ac.grp = &iscsi_session_group;
4906         transport_container_register(&priv->session_cont);
4907
4908         spin_lock_irqsave(&iscsi_transport_lock, flags);
4909         list_add(&priv->list, &iscsi_transports);
4910         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4911
4912         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4913         return &priv->t;
4914
4915 unregister_dev:
4916         device_unregister(&priv->dev);
4917         return NULL;
4918 put_dev:
4919         put_device(&priv->dev);
4920         return NULL;
4921 }
4922 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4923
4924 void iscsi_unregister_transport(struct iscsi_transport *tt)
4925 {
4926         struct iscsi_internal *priv;
4927         unsigned long flags;
4928
4929         BUG_ON(!tt);
4930
4931         mutex_lock(&rx_queue_mutex);
4932
4933         priv = iscsi_if_transport_lookup(tt);
4934         BUG_ON (!priv);
4935
4936         spin_lock_irqsave(&iscsi_transport_lock, flags);
4937         list_del(&priv->list);
4938         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4939
4940         transport_container_unregister(&priv->conn_cont);
4941         transport_container_unregister(&priv->session_cont);
4942         transport_container_unregister(&priv->t.host_attrs);
4943
4944         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4945         device_unregister(&priv->dev);
4946         mutex_unlock(&rx_queue_mutex);
4947 }
4948 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4949
4950 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4951                      struct device *dev, const char *fmt, ...)
4952 {
4953         struct va_format vaf;
4954         va_list args;
4955
4956         va_start(args, fmt);
4957         vaf.fmt = fmt;
4958         vaf.va = &args;
4959         trace(dev, &vaf);
4960         va_end(args);
4961 }
4962 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4963
4964 static __init int iscsi_transport_init(void)
4965 {
4966         int err;
4967         struct netlink_kernel_cfg cfg = {
4968                 .groups = 1,
4969                 .input  = iscsi_if_rx,
4970         };
4971         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4972                 ISCSI_TRANSPORT_VERSION);
4973
4974         atomic_set(&iscsi_session_nr, 0);
4975
4976         err = class_register(&iscsi_transport_class);
4977         if (err)
4978                 return err;
4979
4980         err = class_register(&iscsi_endpoint_class);
4981         if (err)
4982                 goto unregister_transport_class;
4983
4984         err = class_register(&iscsi_iface_class);
4985         if (err)
4986                 goto unregister_endpoint_class;
4987
4988         err = transport_class_register(&iscsi_host_class);
4989         if (err)
4990                 goto unregister_iface_class;
4991
4992         err = transport_class_register(&iscsi_connection_class);
4993         if (err)
4994                 goto unregister_host_class;
4995
4996         err = transport_class_register(&iscsi_session_class);
4997         if (err)
4998                 goto unregister_conn_class;
4999
5000         err = bus_register(&iscsi_flashnode_bus);
5001         if (err)
5002                 goto unregister_session_class;
5003
5004         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
5005         if (!nls) {
5006                 err = -ENOBUFS;
5007                 goto unregister_flashnode_bus;
5008         }
5009
5010         iscsi_conn_cleanup_workq = alloc_workqueue("%s",
5011                         WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
5012                         "iscsi_conn_cleanup");
5013         if (!iscsi_conn_cleanup_workq) {
5014                 err = -ENOMEM;
5015                 goto release_nls;
5016         }
5017
5018         return 0;
5019
5020 release_nls:
5021         netlink_kernel_release(nls);
5022 unregister_flashnode_bus:
5023         bus_unregister(&iscsi_flashnode_bus);
5024 unregister_session_class:
5025         transport_class_unregister(&iscsi_session_class);
5026 unregister_conn_class:
5027         transport_class_unregister(&iscsi_connection_class);
5028 unregister_host_class:
5029         transport_class_unregister(&iscsi_host_class);
5030 unregister_iface_class:
5031         class_unregister(&iscsi_iface_class);
5032 unregister_endpoint_class:
5033         class_unregister(&iscsi_endpoint_class);
5034 unregister_transport_class:
5035         class_unregister(&iscsi_transport_class);
5036         return err;
5037 }
5038
5039 static void __exit iscsi_transport_exit(void)
5040 {
5041         destroy_workqueue(iscsi_conn_cleanup_workq);
5042         netlink_kernel_release(nls);
5043         bus_unregister(&iscsi_flashnode_bus);
5044         transport_class_unregister(&iscsi_connection_class);
5045         transport_class_unregister(&iscsi_session_class);
5046         transport_class_unregister(&iscsi_host_class);
5047         class_unregister(&iscsi_endpoint_class);
5048         class_unregister(&iscsi_iface_class);
5049         class_unregister(&iscsi_transport_class);
5050 }
5051
5052 module_init(iscsi_transport_init);
5053 module_exit(iscsi_transport_exit);
5054
5055 MODULE_AUTHOR("Mike Christie <[email protected]>, "
5056               "Dmitry Yusupov <[email protected]>, "
5057               "Alex Aizman <[email protected]>");
5058 MODULE_DESCRIPTION("iSCSI Transport Interface");
5059 MODULE_LICENSE("GPL");
5060 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
5061 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);