drivers/scsi/scsi_transport_iscsi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   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 CREATE_TRACE_POINTS
  28 #include <trace/events/iscsi.h>
  29
  30 /*
  31  * Export tracepoint symbols to be used by other modules.
  32  */
  33 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
  34 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
  35 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
  36 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
  37 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
  38
  39 static int dbg_session;
  40 module_param_named(debug_session, dbg_session, int,
  41                    S_IRUGO | S_IWUSR);
  42 MODULE_PARM_DESC(debug_session,
  43                  "Turn on debugging for sessions in scsi_transport_iscsi "
  44                  "module. Set to 1 to turn on, and zero to turn off. Default "
  45                  "is off.");
  46
  47 static int dbg_conn;
  48 module_param_named(debug_conn, dbg_conn, int,
  49                    S_IRUGO | S_IWUSR);
  50 MODULE_PARM_DESC(debug_conn,
  51                  "Turn on debugging for connections in scsi_transport_iscsi "
  52                  "module. Set to 1 to turn on, and zero to turn off. Default "
  53                  "is off.");
  54
  55 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  56         do {                                                            \
  57                 if (dbg_session)                                        \
  58                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  59                                                  "%s: " dbg_fmt,        \
  60                                                  __func__, ##arg);      \
  61                 iscsi_dbg_trace(trace_iscsi_dbg_trans_session,          \
  62                                 &(_session)->dev,                       \
  63                                 "%s " dbg_fmt, __func__, ##arg);        \
  64         } while (0);
  65
  66 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  67         do {                                                            \
  68                 if (dbg_conn)                                           \
  69                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  70                                               "%s: " dbg_fmt,           \
  71                                               __func__, ##arg);         \
  72                 iscsi_dbg_trace(trace_iscsi_dbg_trans_conn,             \
  73                                 &(_conn)->dev,                          \
  74                                 "%s " dbg_fmt, __func__, ##arg);        \
  75         } while (0);
  76
  77 struct iscsi_internal {
  78         struct scsi_transport_template t;
  79         struct iscsi_transport *iscsi_transport;
  80         struct list_head list;
  81         struct device dev;
  82
  83         struct transport_container conn_cont;
  84         struct transport_container session_cont;
  85 };
  86
  87 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  88 static struct workqueue_struct *iscsi_eh_timer_workq;
  89
  90 static DEFINE_IDA(iscsi_sess_ida);
  91 /*
  92  * list of registered transports and lock that must
  93  * be held while accessing list. The iscsi_transport_lock must
  94  * be acquired after the rx_queue_mutex.
  95  */
  96 static LIST_HEAD(iscsi_transports);
  97 static DEFINE_SPINLOCK(iscsi_transport_lock);
  98
  99 #define to_iscsi_internal(tmpl) \
 100         container_of(tmpl, struct iscsi_internal, t)
 101
 102 #define dev_to_iscsi_internal(_dev) \
 103         container_of(_dev, struct iscsi_internal, dev)
 104
 105 static void iscsi_transport_release(struct device *dev)
 106 {
 107         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 108         kfree(priv);
 109 }
 110
 111 /*
 112  * iscsi_transport_class represents the iscsi_transports that are
 113  * registered.
 114  */
 115 static struct class iscsi_transport_class = {
 116         .name = "iscsi_transport",
 117         .dev_release = iscsi_transport_release,
 118 };
 119
 120 static ssize_t
 121 show_transport_handle(struct device *dev, struct device_attribute *attr,
 122                       char *buf)
 123 {
 124         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 125         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
 126 }
 127 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 128
 129 #define show_transport_attr(name, format)                               \
 130 static ssize_t                                                          \
 131 show_transport_##name(struct device *dev,                               \
 132                       struct device_attribute *attr,char *buf)          \
 133 {                                                                       \
 134         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 135         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
 136 }                                                                       \
 137 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 138
 139 show_transport_attr(caps, "0x%x");
 140
 141 static struct attribute *iscsi_transport_attrs[] = {
 142         &dev_attr_handle.attr,
 143         &dev_attr_caps.attr,
 144         NULL,
 145 };
 146
 147 static struct attribute_group iscsi_transport_group = {
 148         .attrs = iscsi_transport_attrs,
 149 };
 150
 151 /*
 152  * iSCSI endpoint attrs
 153  */
 154 #define iscsi_dev_to_endpoint(_dev) \
 155         container_of(_dev, struct iscsi_endpoint, dev)
 156
 157 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 158 struct device_attribute dev_attr_##_prefix##_##_name =  \
 159         __ATTR(_name,_mode,_show,_store)
 160
 161 static void iscsi_endpoint_release(struct device *dev)
 162 {
 163         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 164         kfree(ep);
 165 }
 166
 167 static struct class iscsi_endpoint_class = {
 168         .name = "iscsi_endpoint",
 169         .dev_release = iscsi_endpoint_release,
 170 };
 171
 172 static ssize_t
 173 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 174 {
 175         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 176         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 177 }
 178 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 179
 180 static struct attribute *iscsi_endpoint_attrs[] = {
 181         &dev_attr_ep_handle.attr,
 182         NULL,
 183 };
 184
 185 static struct attribute_group iscsi_endpoint_group = {
 186         .attrs = iscsi_endpoint_attrs,
 187 };
 188
 189 #define ISCSI_MAX_EPID -1
 190
 191 static int iscsi_match_epid(struct device *dev, const void *data)
 192 {
 193         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 194         const uint64_t *epid = data;
 195
 196         return *epid == ep->id;
 197 }
 198
 199 struct iscsi_endpoint *
 200 iscsi_create_endpoint(int dd_size)
 201 {
 202         struct device *dev;
 203         struct iscsi_endpoint *ep;
 204         uint64_t id;
 205         int err;
 206
 207         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 208                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 209                                         iscsi_match_epid);
 210                 if (!dev)
 211                         break;
 212                 else
 213                         put_device(dev);
 214         }
 215         if (id == ISCSI_MAX_EPID) {
 216                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 217                        ISCSI_MAX_EPID - 1);
 218                 return NULL;
 219         }
 220
 221         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 222         if (!ep)
 223                 return NULL;
 224
 225         ep->id = id;
 226         ep->dev.class = &iscsi_endpoint_class;
 227         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 228         err = device_register(&ep->dev);
 229         if (err)
 230                 goto free_ep;
 231
 232         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 233         if (err)
 234                 goto unregister_dev;
 235
 236         if (dd_size)
 237                 ep->dd_data = &ep[1];
 238         return ep;
 239
 240 unregister_dev:
 241         device_unregister(&ep->dev);
 242         return NULL;
 243
 244 free_ep:
 245         kfree(ep);
 246         return NULL;
 247 }
 248 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 249
 250 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 251 {
 252         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 253         device_unregister(&ep->dev);
 254 }
 255 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 256
 257 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 258 {
 259         struct iscsi_endpoint *ep;
 260         struct device *dev;
 261
 262         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 263                                 iscsi_match_epid);
 264         if (!dev)
 265                 return NULL;
 266
 267         ep = iscsi_dev_to_endpoint(dev);
 268         /*
 269          * we can drop this now because the interface will prevent
 270          * removals and lookups from racing.
 271          */
 272         put_device(dev);
 273         return ep;
 274 }
 275 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 276
 277 /*
 278  * Interface to display network param to sysfs
 279  */
 280
 281 static void iscsi_iface_release(struct device *dev)
 282 {
 283         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 284         struct device *parent = iface->dev.parent;
 285
 286         kfree(iface);
 287         put_device(parent);
 288 }
 289
 290
 291 static struct class iscsi_iface_class = {
 292         .name = "iscsi_iface",
 293         .dev_release = iscsi_iface_release,
 294 };
 295
 296 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 297 struct device_attribute dev_attr_##_prefix##_##_name =          \
 298         __ATTR(_name, _mode, _show, _store)
 299
 300 /* iface attrs show */
 301 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 302 static ssize_t                                                          \
 303 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 304                      char *buf)                                         \
 305 {                                                                       \
 306         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 307         struct iscsi_transport *t = iface->transport;                   \
 308         return t->get_iface_param(iface, param_type, param, buf);       \
 309 }                                                                       \
 310
 311 #define iscsi_iface_net_attr(type, name, param)                         \
 312         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 313 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 314
 315 #define iscsi_iface_attr(type, name, param)                             \
 316         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 317 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 318
 319 /* generic read only ipv4 attribute */
 320 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 321 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 322 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 323 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 324 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 325                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 326 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 327                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 328 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 329 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 330 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 331                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 332 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 333                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 334 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 335                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 336 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 337                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 338 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 339                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 340 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 341                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 342 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 343                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 344 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 345                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 346 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 347                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 348 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 349
 350 /* generic read only ipv6 attribute */
 351 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 352 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 353                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 354 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 355 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 356                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 357 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 358                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 359 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 360                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 361 iscsi_iface_net_attr(ipv6_iface, router_state,
 362                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 363 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 364                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 365 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 366 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 367 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 368                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 369 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 370 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 371                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 372 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 373                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 374 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 375                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 376 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 377                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 378 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 379                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 380
 381 /* common read only iface attribute */
 382 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 383 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 384 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 385 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 386 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 387 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 388 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 389 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 390 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 391                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 392 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 393 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 394 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 395 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 396 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 397 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 398
 399 /* common iscsi specific settings attributes */
 400 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 401 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 402 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 403 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 404 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 405 iscsi_iface_attr(iface, data_seq_in_order,
 406                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 407 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 408 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 409 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 410 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 411 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 412 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 413 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 414 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 415 iscsi_iface_attr(iface, discovery_auth_optional,
 416                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 417 iscsi_iface_attr(iface, discovery_logout,
 418                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 419 iscsi_iface_attr(iface, strict_login_comp_en,
 420                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 421 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 422
 423 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 424                                           struct attribute *attr, int i)
 425 {
 426         struct device *dev = container_of(kobj, struct device, kobj);
 427         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 428         struct iscsi_transport *t = iface->transport;
 429         int param;
 430         int param_type;
 431
 432         if (attr == &dev_attr_iface_enabled.attr)
 433                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 434         else if (attr == &dev_attr_iface_vlan_id.attr)
 435                 param = ISCSI_NET_PARAM_VLAN_ID;
 436         else if (attr == &dev_attr_iface_vlan_priority.attr)
 437                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 438         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 439                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 440         else if (attr == &dev_attr_iface_mtu.attr)
 441                 param = ISCSI_NET_PARAM_MTU;
 442         else if (attr == &dev_attr_iface_port.attr)
 443                 param = ISCSI_NET_PARAM_PORT;
 444         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 445                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 446         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 447                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 448         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 449                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 450         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 451                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 452         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 453                 param = ISCSI_NET_PARAM_TCP_WSF;
 454         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 455                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 456         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 457                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 458         else if (attr == &dev_attr_iface_cache_id.attr)
 459                 param = ISCSI_NET_PARAM_CACHE_ID;
 460         else if (attr == &dev_attr_iface_redirect_en.attr)
 461                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 462         else if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 463                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 464         else if (attr == &dev_attr_iface_header_digest.attr)
 465                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 466         else if (attr == &dev_attr_iface_data_digest.attr)
 467                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 468         else if (attr == &dev_attr_iface_immediate_data.attr)
 469                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 470         else if (attr == &dev_attr_iface_initial_r2t.attr)
 471                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 472         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 473                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 474         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 475                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 476         else if (attr == &dev_attr_iface_erl.attr)
 477                 param = ISCSI_IFACE_PARAM_ERL;
 478         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 479                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 480         else if (attr == &dev_attr_iface_first_burst_len.attr)
 481                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 482         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 483                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 484         else if (attr == &dev_attr_iface_max_burst_len.attr)
 485                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 486         else if (attr == &dev_attr_iface_chap_auth.attr)
 487                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 488         else if (attr == &dev_attr_iface_bidi_chap.attr)
 489                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 490         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 491                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 492         else if (attr == &dev_attr_iface_discovery_logout.attr)
 493                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 494         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 495                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 496         else if (attr == &dev_attr_iface_initiator_name.attr)
 497                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 498         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 499                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 500                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 501                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 502                         param = ISCSI_NET_PARAM_IPV4_GW;
 503                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 504                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 505                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 506                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 507                 else if (attr ==
 508                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 509                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 510                 else if (attr ==
 511                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 512                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 513                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 514                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 515                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 516                         param = ISCSI_NET_PARAM_IPV4_TOS;
 517                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 518                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 519                 else if (attr ==
 520                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 521                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 522                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 523                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 524                 else if (attr ==
 525                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 526                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 527                 else if (attr ==
 528                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 529                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 530                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 531                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 532                 else if (attr ==
 533                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 534                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 535                 else if (attr ==
 536                          &dev_attr_ipv4_iface_fragment_disable.attr)
 537                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 538                 else if (attr ==
 539                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 540                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 541                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 542                         param = ISCSI_NET_PARAM_IPV4_TTL;
 543                 else
 544                         return 0;
 545         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 546                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 547                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 548                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 549                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 550                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 551                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 552                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 553                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 554                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 555                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 556                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 557                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 558                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 559                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 560                 else if (attr ==
 561                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 562                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 563                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 564                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 565                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 566                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 567                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 568                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 569                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 570                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 571                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 572                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 573                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 574                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 575                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 576                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 577                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 578                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 579                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 580                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 581                 else
 582                         return 0;
 583         } else {
 584                 WARN_ONCE(1, "Invalid iface attr");
 585                 return 0;
 586         }
 587
 588         switch (param) {
 589         case ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO:
 590         case ISCSI_IFACE_PARAM_HDRDGST_EN:
 591         case ISCSI_IFACE_PARAM_DATADGST_EN:
 592         case ISCSI_IFACE_PARAM_IMM_DATA_EN:
 593         case ISCSI_IFACE_PARAM_INITIAL_R2T_EN:
 594         case ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN:
 595         case ISCSI_IFACE_PARAM_PDU_INORDER_EN:
 596         case ISCSI_IFACE_PARAM_ERL:
 597         case ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH:
 598         case ISCSI_IFACE_PARAM_FIRST_BURST:
 599         case ISCSI_IFACE_PARAM_MAX_R2T:
 600         case ISCSI_IFACE_PARAM_MAX_BURST:
 601         case ISCSI_IFACE_PARAM_CHAP_AUTH_EN:
 602         case ISCSI_IFACE_PARAM_BIDI_CHAP_EN:
 603         case ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL:
 604         case ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN:
 605         case ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN:
 606         case ISCSI_IFACE_PARAM_INITIATOR_NAME:
 607                 param_type = ISCSI_IFACE_PARAM;
 608                 break;
 609         default:
 610                 param_type = ISCSI_NET_PARAM;
 611         }
 612
 613         return t->attr_is_visible(param_type, param);
 614 }
 615
 616 static struct attribute *iscsi_iface_attrs[] = {
 617         &dev_attr_iface_enabled.attr,
 618         &dev_attr_iface_vlan_id.attr,
 619         &dev_attr_iface_vlan_priority.attr,
 620         &dev_attr_iface_vlan_enabled.attr,
 621         &dev_attr_ipv4_iface_ipaddress.attr,
 622         &dev_attr_ipv4_iface_gateway.attr,
 623         &dev_attr_ipv4_iface_subnet.attr,
 624         &dev_attr_ipv4_iface_bootproto.attr,
 625         &dev_attr_ipv6_iface_ipaddress.attr,
 626         &dev_attr_ipv6_iface_link_local_addr.attr,
 627         &dev_attr_ipv6_iface_router_addr.attr,
 628         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 629         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 630         &dev_attr_iface_mtu.attr,
 631         &dev_attr_iface_port.attr,
 632         &dev_attr_iface_ipaddress_state.attr,
 633         &dev_attr_iface_delayed_ack_en.attr,
 634         &dev_attr_iface_tcp_nagle_disable.attr,
 635         &dev_attr_iface_tcp_wsf_disable.attr,
 636         &dev_attr_iface_tcp_wsf.attr,
 637         &dev_attr_iface_tcp_timer_scale.attr,
 638         &dev_attr_iface_tcp_timestamp_en.attr,
 639         &dev_attr_iface_cache_id.attr,
 640         &dev_attr_iface_redirect_en.attr,
 641         &dev_attr_iface_def_taskmgmt_tmo.attr,
 642         &dev_attr_iface_header_digest.attr,
 643         &dev_attr_iface_data_digest.attr,
 644         &dev_attr_iface_immediate_data.attr,
 645         &dev_attr_iface_initial_r2t.attr,
 646         &dev_attr_iface_data_seq_in_order.attr,
 647         &dev_attr_iface_data_pdu_in_order.attr,
 648         &dev_attr_iface_erl.attr,
 649         &dev_attr_iface_max_recv_dlength.attr,
 650         &dev_attr_iface_first_burst_len.attr,
 651         &dev_attr_iface_max_outstanding_r2t.attr,
 652         &dev_attr_iface_max_burst_len.attr,
 653         &dev_attr_iface_chap_auth.attr,
 654         &dev_attr_iface_bidi_chap.attr,
 655         &dev_attr_iface_discovery_auth_optional.attr,
 656         &dev_attr_iface_discovery_logout.attr,
 657         &dev_attr_iface_strict_login_comp_en.attr,
 658         &dev_attr_iface_initiator_name.attr,
 659         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 660         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 661         &dev_attr_ipv4_iface_tos_en.attr,
 662         &dev_attr_ipv4_iface_tos.attr,
 663         &dev_attr_ipv4_iface_grat_arp_en.attr,
 664         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 665         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 666         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 667         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 668         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 669         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 670         &dev_attr_ipv4_iface_fragment_disable.attr,
 671         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 672         &dev_attr_ipv4_iface_ttl.attr,
 673         &dev_attr_ipv6_iface_link_local_state.attr,
 674         &dev_attr_ipv6_iface_router_state.attr,
 675         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 676         &dev_attr_ipv6_iface_mld_en.attr,
 677         &dev_attr_ipv6_iface_flow_label.attr,
 678         &dev_attr_ipv6_iface_traffic_class.attr,
 679         &dev_attr_ipv6_iface_hop_limit.attr,
 680         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 681         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 682         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 683         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 684         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 685         NULL,
 686 };
 687
 688 static struct attribute_group iscsi_iface_group = {
 689         .attrs = iscsi_iface_attrs,
 690         .is_visible = iscsi_iface_attr_is_visible,
 691 };
 692
 693 /* convert iscsi_ipaddress_state values to ascii string name */
 694 static const struct {
 695         enum iscsi_ipaddress_state      value;
 696         char                            *name;
 697 } iscsi_ipaddress_state_names[] = {
 698         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 699         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 700         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 701         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 702         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 703         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 704         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 705 };
 706
 707 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 708 {
 709         int i;
 710         char *state = NULL;
 711
 712         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 713                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 714                         state = iscsi_ipaddress_state_names[i].name;
 715                         break;
 716                 }
 717         }
 718         return state;
 719 }
 720 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 721
 722 /* convert iscsi_router_state values to ascii string name */
 723 static const struct {
 724         enum iscsi_router_state value;
 725         char                    *name;
 726 } iscsi_router_state_names[] = {
 727         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 728         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 729         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 730         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 731 };
 732
 733 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 734 {
 735         int i;
 736         char *state = NULL;
 737
 738         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 739                 if (iscsi_router_state_names[i].value == router_state) {
 740                         state = iscsi_router_state_names[i].name;
 741                         break;
 742                 }
 743         }
 744         return state;
 745 }
 746 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 747
 748 struct iscsi_iface *
 749 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 750                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 751 {
 752         struct iscsi_iface *iface;
 753         int err;
 754
 755         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 756         if (!iface)
 757                 return NULL;
 758
 759         iface->transport = transport;
 760         iface->iface_type = iface_type;
 761         iface->iface_num = iface_num;
 762         iface->dev.release = iscsi_iface_release;
 763         iface->dev.class = &iscsi_iface_class;
 764         /* parent reference released in iscsi_iface_release */
 765         iface->dev.parent = get_device(&shost->shost_gendev);
 766         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 767                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 768                              iface_num);
 769         else
 770                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 771                              iface_num);
 772
 773         err = device_register(&iface->dev);
 774         if (err)
 775                 goto free_iface;
 776
 777         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 778         if (err)
 779                 goto unreg_iface;
 780
 781         if (dd_size)
 782                 iface->dd_data = &iface[1];
 783         return iface;
 784
 785 unreg_iface:
 786         device_unregister(&iface->dev);
 787         return NULL;
 788
 789 free_iface:
 790         put_device(iface->dev.parent);
 791         kfree(iface);
 792         return NULL;
 793 }
 794 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 795
 796 void iscsi_destroy_iface(struct iscsi_iface *iface)
 797 {
 798         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 799         device_unregister(&iface->dev);
 800 }
 801 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 802
 803 /*
 804  * Interface to display flash node params to sysfs
 805  */
 806
 807 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 808 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 809         __ATTR(_name, _mode, _show, _store)
 810
 811 /* flash node session attrs show */
 812 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 813 static ssize_t                                                          \
 814 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 815                      char *buf)                                         \
 816 {                                                                       \
 817         struct iscsi_bus_flash_session *fnode_sess =                    \
 818                                         iscsi_dev_to_flash_session(dev);\
 819         struct iscsi_transport *t = fnode_sess->transport;              \
 820         return t->get_flashnode_param(fnode_sess, param, buf);          \
 821 }                                                                       \
 822
 823
 824 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 825         iscsi_flashnode_sess_attr_show(type, name, param)               \
 826 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 827                             show_##type##_##name, NULL);
 828
 829 /* Flash node session attributes */
 830
 831 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 832                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 833 iscsi_flashnode_sess_attr(fnode, discovery_session,
 834                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 835 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 836 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 837 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 838 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 839 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 840                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 841 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 842                           ISCSI_FLASHNODE_PDU_INORDER);
 843 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 844 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 845                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 846 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 847 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 848                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 849 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 850 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 851 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 852 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 853                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 854 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 855 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 856 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 857 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 858 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 859                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 860 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 861 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 862 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 863 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 864                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 865 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 866                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 867 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 868 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 869 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 870 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 871 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 872 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 873 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 874
 875 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 876         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 877         &dev_attr_fnode_discovery_session.attr,
 878         &dev_attr_fnode_portal_type.attr,
 879         &dev_attr_fnode_entry_enable.attr,
 880         &dev_attr_fnode_immediate_data.attr,
 881         &dev_attr_fnode_initial_r2t.attr,
 882         &dev_attr_fnode_data_seq_in_order.attr,
 883         &dev_attr_fnode_data_pdu_in_order.attr,
 884         &dev_attr_fnode_chap_auth.attr,
 885         &dev_attr_fnode_discovery_logout.attr,
 886         &dev_attr_fnode_bidi_chap.attr,
 887         &dev_attr_fnode_discovery_auth_optional.attr,
 888         &dev_attr_fnode_erl.attr,
 889         &dev_attr_fnode_first_burst_len.attr,
 890         &dev_attr_fnode_def_time2wait.attr,
 891         &dev_attr_fnode_def_time2retain.attr,
 892         &dev_attr_fnode_max_outstanding_r2t.attr,
 893         &dev_attr_fnode_isid.attr,
 894         &dev_attr_fnode_tsid.attr,
 895         &dev_attr_fnode_max_burst_len.attr,
 896         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 897         &dev_attr_fnode_targetalias.attr,
 898         &dev_attr_fnode_targetname.attr,
 899         &dev_attr_fnode_tpgt.attr,
 900         &dev_attr_fnode_discovery_parent_idx.attr,
 901         &dev_attr_fnode_discovery_parent_type.attr,
 902         &dev_attr_fnode_chap_in_idx.attr,
 903         &dev_attr_fnode_chap_out_idx.attr,
 904         &dev_attr_fnode_username.attr,
 905         &dev_attr_fnode_username_in.attr,
 906         &dev_attr_fnode_password.attr,
 907         &dev_attr_fnode_password_in.attr,
 908         &dev_attr_fnode_is_boot_target.attr,
 909         NULL,
 910 };
 911
 912 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 913                                                     struct attribute *attr,
 914                                                     int i)
 915 {
 916         struct device *dev = container_of(kobj, struct device, kobj);
 917         struct iscsi_bus_flash_session *fnode_sess =
 918                                                 iscsi_dev_to_flash_session(dev);
 919         struct iscsi_transport *t = fnode_sess->transport;
 920         int param;
 921
 922         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 923                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 924         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 925                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 926         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 927                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 928         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 929                 param = ISCSI_FLASHNODE_ENTRY_EN;
 930         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 931                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 932         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 933                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 934         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 935                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 936         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 937                 param = ISCSI_FLASHNODE_PDU_INORDER;
 938         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 939                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 940         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 941                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 942         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 943                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 944         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 945                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 946         } else if (attr == &dev_attr_fnode_erl.attr) {
 947                 param = ISCSI_FLASHNODE_ERL;
 948         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 949                 param = ISCSI_FLASHNODE_FIRST_BURST;
 950         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 951                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 952         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 953                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 954         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 955                 param = ISCSI_FLASHNODE_MAX_R2T;
 956         } else if (attr == &dev_attr_fnode_isid.attr) {
 957                 param = ISCSI_FLASHNODE_ISID;
 958         } else if (attr == &dev_attr_fnode_tsid.attr) {
 959                 param = ISCSI_FLASHNODE_TSID;
 960         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 961                 param = ISCSI_FLASHNODE_MAX_BURST;
 962         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 963                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 964         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 965                 param = ISCSI_FLASHNODE_ALIAS;
 966         } else if (attr == &dev_attr_fnode_targetname.attr) {
 967                 param = ISCSI_FLASHNODE_NAME;
 968         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 969                 param = ISCSI_FLASHNODE_TPGT;
 970         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 971                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 972         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 973                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 974         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 975                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 976         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 977                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 978         } else if (attr == &dev_attr_fnode_username.attr) {
 979                 param = ISCSI_FLASHNODE_USERNAME;
 980         } else if (attr == &dev_attr_fnode_username_in.attr) {
 981                 param = ISCSI_FLASHNODE_USERNAME_IN;
 982         } else if (attr == &dev_attr_fnode_password.attr) {
 983                 param = ISCSI_FLASHNODE_PASSWORD;
 984         } else if (attr == &dev_attr_fnode_password_in.attr) {
 985                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 986         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 987                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 988         } else {
 989                 WARN_ONCE(1, "Invalid flashnode session attr");
 990                 return 0;
 991         }
 992
 993         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 994 }
 995
 996 static struct attribute_group iscsi_flashnode_sess_attr_group = {
 997         .attrs = iscsi_flashnode_sess_attrs,
 998         .is_visible = iscsi_flashnode_sess_attr_is_visible,
 999 };
1000
1001 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
1002         &iscsi_flashnode_sess_attr_group,
1003         NULL,
1004 };
1005
1006 static void iscsi_flashnode_sess_release(struct device *dev)
1007 {
1008         struct iscsi_bus_flash_session *fnode_sess =
1009                                                 iscsi_dev_to_flash_session(dev);
1010
1011         kfree(fnode_sess->targetname);
1012         kfree(fnode_sess->targetalias);
1013         kfree(fnode_sess->portal_type);
1014         kfree(fnode_sess);
1015 }
1016
1017 static const struct device_type iscsi_flashnode_sess_dev_type = {
1018         .name = "iscsi_flashnode_sess_dev_type",
1019         .groups = iscsi_flashnode_sess_attr_groups,
1020         .release = iscsi_flashnode_sess_release,
1021 };
1022
1023 /* flash node connection attrs show */
1024 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1025 static ssize_t                                                          \
1026 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1027                      char *buf)                                         \
1028 {                                                                       \
1029         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1030         struct iscsi_bus_flash_session *fnode_sess =                    \
1031                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1032         struct iscsi_transport *t = fnode_conn->transport;              \
1033         return t->get_flashnode_param(fnode_sess, param, buf);          \
1034 }                                                                       \
1035
1036
1037 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1038         iscsi_flashnode_conn_attr_show(type, name, param)               \
1039 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1040                             show_##type##_##name, NULL);
1041
1042 /* Flash node connection attributes */
1043
1044 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1045                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1046 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1047 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1048 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1049 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1050                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1051 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1052                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1053 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1054                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1055 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1056                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1057 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1058                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1059 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1060                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1061 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1062 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1063 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1064 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1065                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1066 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1067                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1068 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1069 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1070 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1071 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1072                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1073 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1074                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1075 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1076                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1077 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1078                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1079 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1080 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1081 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1082 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1083
1084 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1085         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1086         &dev_attr_fnode_header_digest.attr,
1087         &dev_attr_fnode_data_digest.attr,
1088         &dev_attr_fnode_snack_req.attr,
1089         &dev_attr_fnode_tcp_timestamp_stat.attr,
1090         &dev_attr_fnode_tcp_nagle_disable.attr,
1091         &dev_attr_fnode_tcp_wsf_disable.attr,
1092         &dev_attr_fnode_tcp_timer_scale.attr,
1093         &dev_attr_fnode_tcp_timestamp_enable.attr,
1094         &dev_attr_fnode_fragment_disable.attr,
1095         &dev_attr_fnode_max_recv_dlength.attr,
1096         &dev_attr_fnode_max_xmit_dlength.attr,
1097         &dev_attr_fnode_keepalive_tmo.attr,
1098         &dev_attr_fnode_port.attr,
1099         &dev_attr_fnode_ipaddress.attr,
1100         &dev_attr_fnode_redirect_ipaddr.attr,
1101         &dev_attr_fnode_max_segment_size.attr,
1102         &dev_attr_fnode_local_port.attr,
1103         &dev_attr_fnode_ipv4_tos.attr,
1104         &dev_attr_fnode_ipv6_traffic_class.attr,
1105         &dev_attr_fnode_ipv6_flow_label.attr,
1106         &dev_attr_fnode_link_local_ipv6.attr,
1107         &dev_attr_fnode_tcp_xmit_wsf.attr,
1108         &dev_attr_fnode_tcp_recv_wsf.attr,
1109         &dev_attr_fnode_statsn.attr,
1110         &dev_attr_fnode_exp_statsn.attr,
1111         NULL,
1112 };
1113
1114 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1115                                                     struct attribute *attr,
1116                                                     int i)
1117 {
1118         struct device *dev = container_of(kobj, struct device, kobj);
1119         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1120         struct iscsi_transport *t = fnode_conn->transport;
1121         int param;
1122
1123         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1124                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1125         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1126                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1127         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1128                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1129         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1130                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1131         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1132                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1133         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1134                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1135         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1136                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1137         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1138                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1139         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1140                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1141         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1142                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1143         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1144                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1145         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1146                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1147         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1148                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1149         } else if (attr == &dev_attr_fnode_port.attr) {
1150                 param = ISCSI_FLASHNODE_PORT;
1151         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1152                 param = ISCSI_FLASHNODE_IPADDR;
1153         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1154                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1155         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1156                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1157         } else if (attr == &dev_attr_fnode_local_port.attr) {
1158                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1159         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1160                 param = ISCSI_FLASHNODE_IPV4_TOS;
1161         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1162                 param = ISCSI_FLASHNODE_IPV6_TC;
1163         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1164                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1165         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1166                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1167         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1168                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1169         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1170                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1171         } else if (attr == &dev_attr_fnode_statsn.attr) {
1172                 param = ISCSI_FLASHNODE_STATSN;
1173         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1174                 param = ISCSI_FLASHNODE_EXP_STATSN;
1175         } else {
1176                 WARN_ONCE(1, "Invalid flashnode connection attr");
1177                 return 0;
1178         }
1179
1180         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1181 }
1182
1183 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1184         .attrs = iscsi_flashnode_conn_attrs,
1185         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1186 };
1187
1188 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1189         &iscsi_flashnode_conn_attr_group,
1190         NULL,
1191 };
1192
1193 static void iscsi_flashnode_conn_release(struct device *dev)
1194 {
1195         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1196
1197         kfree(fnode_conn->ipaddress);
1198         kfree(fnode_conn->redirect_ipaddr);
1199         kfree(fnode_conn->link_local_ipv6_addr);
1200         kfree(fnode_conn);
1201 }
1202
1203 static const struct device_type iscsi_flashnode_conn_dev_type = {
1204         .name = "iscsi_flashnode_conn_dev_type",
1205         .groups = iscsi_flashnode_conn_attr_groups,
1206         .release = iscsi_flashnode_conn_release,
1207 };
1208
1209 static struct bus_type iscsi_flashnode_bus;
1210
1211 int iscsi_flashnode_bus_match(struct device *dev,
1212                                      struct device_driver *drv)
1213 {
1214         if (dev->bus == &iscsi_flashnode_bus)
1215                 return 1;
1216         return 0;
1217 }
1218 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1219
1220 static struct bus_type iscsi_flashnode_bus = {
1221         .name = "iscsi_flashnode",
1222         .match = &iscsi_flashnode_bus_match,
1223 };
1224
1225 /**
1226  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1227  * @shost: pointer to host data
1228  * @index: index of flashnode to add in sysfs
1229  * @transport: pointer to transport data
1230  * @dd_size: total size to allocate
1231  *
1232  * Adds a sysfs entry for the flashnode session attributes
1233  *
1234  * Returns:
1235  *  pointer to allocated flashnode sess on success
1236  *  %NULL on failure
1237  */
1238 struct iscsi_bus_flash_session *
1239 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1240                             struct iscsi_transport *transport,
1241                             int dd_size)
1242 {
1243         struct iscsi_bus_flash_session *fnode_sess;
1244         int err;
1245
1246         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1247         if (!fnode_sess)
1248                 return NULL;
1249
1250         fnode_sess->transport = transport;
1251         fnode_sess->target_id = index;
1252         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1253         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1254         fnode_sess->dev.parent = &shost->shost_gendev;
1255         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1256                      shost->host_no, index);
1257
1258         err = device_register(&fnode_sess->dev);
1259         if (err)
1260                 goto free_fnode_sess;
1261
1262         if (dd_size)
1263                 fnode_sess->dd_data = &fnode_sess[1];
1264
1265         return fnode_sess;
1266
1267 free_fnode_sess:
1268         kfree(fnode_sess);
1269         return NULL;
1270 }
1271 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1272
1273 /**
1274  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1275  * @shost: pointer to host data
1276  * @fnode_sess: pointer to the parent flashnode session entry
1277  * @transport: pointer to transport data
1278  * @dd_size: total size to allocate
1279  *
1280  * Adds a sysfs entry for the flashnode connection attributes
1281  *
1282  * Returns:
1283  *  pointer to allocated flashnode conn on success
1284  *  %NULL on failure
1285  */
1286 struct iscsi_bus_flash_conn *
1287 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1288                             struct iscsi_bus_flash_session *fnode_sess,
1289                             struct iscsi_transport *transport,
1290                             int dd_size)
1291 {
1292         struct iscsi_bus_flash_conn *fnode_conn;
1293         int err;
1294
1295         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1296         if (!fnode_conn)
1297                 return NULL;
1298
1299         fnode_conn->transport = transport;
1300         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1301         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1302         fnode_conn->dev.parent = &fnode_sess->dev;
1303         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1304                      shost->host_no, fnode_sess->target_id);
1305
1306         err = device_register(&fnode_conn->dev);
1307         if (err)
1308                 goto free_fnode_conn;
1309
1310         if (dd_size)
1311                 fnode_conn->dd_data = &fnode_conn[1];
1312
1313         return fnode_conn;
1314
1315 free_fnode_conn:
1316         kfree(fnode_conn);
1317         return NULL;
1318 }
1319 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1320
1321 /**
1322  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1323  * @dev: device to verify
1324  * @data: pointer to data containing value to use for verification
1325  *
1326  * Verifies if the passed device is flashnode conn device
1327  *
1328  * Returns:
1329  *  1 on success
1330  *  0 on failure
1331  */
1332 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1333 {
1334         return dev->bus == &iscsi_flashnode_bus;
1335 }
1336
1337 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1338 {
1339         device_unregister(&fnode_conn->dev);
1340         return 0;
1341 }
1342
1343 static int flashnode_match_index(struct device *dev, void *data)
1344 {
1345         struct iscsi_bus_flash_session *fnode_sess = NULL;
1346         int ret = 0;
1347
1348         if (!iscsi_flashnode_bus_match(dev, NULL))
1349                 goto exit_match_index;
1350
1351         fnode_sess = iscsi_dev_to_flash_session(dev);
1352         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1353
1354 exit_match_index:
1355         return ret;
1356 }
1357
1358 /**
1359  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1360  * @shost: pointer to host data
1361  * @idx: index to match
1362  *
1363  * Finds the flashnode session object for the passed index
1364  *
1365  * Returns:
1366  *  pointer to found flashnode session object on success
1367  *  %NULL on failure
1368  */
1369 static struct iscsi_bus_flash_session *
1370 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1371 {
1372         struct iscsi_bus_flash_session *fnode_sess = NULL;
1373         struct device *dev;
1374
1375         dev = device_find_child(&shost->shost_gendev, &idx,
1376                                 flashnode_match_index);
1377         if (dev)
1378                 fnode_sess = iscsi_dev_to_flash_session(dev);
1379
1380         return fnode_sess;
1381 }
1382
1383 /**
1384  * iscsi_find_flashnode_sess - finds flashnode session entry
1385  * @shost: pointer to host data
1386  * @data: pointer to data containing value to use for comparison
1387  * @fn: function pointer that does actual comparison
1388  *
1389  * Finds the flashnode session object comparing the data passed using logic
1390  * defined in passed function pointer
1391  *
1392  * Returns:
1393  *  pointer to found flashnode session device object on success
1394  *  %NULL on failure
1395  */
1396 struct device *
1397 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1398                           int (*fn)(struct device *dev, void *data))
1399 {
1400         return device_find_child(&shost->shost_gendev, data, fn);
1401 }
1402 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1403
1404 /**
1405  * iscsi_find_flashnode_conn - finds flashnode connection entry
1406  * @fnode_sess: pointer to parent flashnode session entry
1407  *
1408  * Finds the flashnode connection object comparing the data passed using logic
1409  * defined in passed function pointer
1410  *
1411  * Returns:
1412  *  pointer to found flashnode connection device object on success
1413  *  %NULL on failure
1414  */
1415 struct device *
1416 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1417 {
1418         return device_find_child(&fnode_sess->dev, NULL,
1419                                  iscsi_is_flashnode_conn_dev);
1420 }
1421 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1422
1423 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1424 {
1425         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1426                 return 0;
1427
1428         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1429 }
1430
1431 /**
1432  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1433  * @fnode_sess: pointer to flashnode session entry to be destroyed
1434  *
1435  * Deletes the flashnode session entry and all children flashnode connection
1436  * entries from sysfs
1437  */
1438 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1439 {
1440         int err;
1441
1442         err = device_for_each_child(&fnode_sess->dev, NULL,
1443                                     iscsi_iter_destroy_flashnode_conn_fn);
1444         if (err)
1445                 pr_err("Could not delete all connections for %s. Error %d.\n",
1446                        fnode_sess->dev.kobj.name, err);
1447
1448         device_unregister(&fnode_sess->dev);
1449 }
1450 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1451
1452 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1453 {
1454         if (!iscsi_flashnode_bus_match(dev, NULL))
1455                 return 0;
1456
1457         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1458         return 0;
1459 }
1460
1461 /**
1462  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1463  * @shost: pointer to host data
1464  *
1465  * Destroys all the flashnode session entries and all corresponding children
1466  * flashnode connection entries from sysfs
1467  */
1468 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1469 {
1470         device_for_each_child(&shost->shost_gendev, NULL,
1471                               iscsi_iter_destroy_flashnode_fn);
1472 }
1473 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1474
1475 /*
1476  * BSG support
1477  */
1478 /**
1479  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1480  * @job: bsg job to be processed
1481  */
1482 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1483 {
1484         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1485         struct iscsi_bsg_request *req = job->request;
1486         struct iscsi_bsg_reply *reply = job->reply;
1487         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1488         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1489         int ret;
1490
1491         /* check if we have the msgcode value at least */
1492         if (job->request_len < sizeof(uint32_t)) {
1493                 ret = -ENOMSG;
1494                 goto fail_host_msg;
1495         }
1496
1497         /* Validate the host command */
1498         switch (req->msgcode) {
1499         case ISCSI_BSG_HST_VENDOR:
1500                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1501                 if ((shost->hostt->vendor_id == 0L) ||
1502                     (req->rqst_data.h_vendor.vendor_id !=
1503                         shost->hostt->vendor_id)) {
1504                         ret = -ESRCH;
1505                         goto fail_host_msg;
1506                 }
1507                 break;
1508         default:
1509                 ret = -EBADR;
1510                 goto fail_host_msg;
1511         }
1512
1513         /* check if we really have all the request data needed */
1514         if (job->request_len < cmdlen) {
1515                 ret = -ENOMSG;
1516                 goto fail_host_msg;
1517         }
1518
1519         ret = i->iscsi_transport->bsg_request(job);
1520         if (!ret)
1521                 return 0;
1522
1523 fail_host_msg:
1524         /* return the errno failure code as the only status */
1525         BUG_ON(job->reply_len < sizeof(uint32_t));
1526         reply->reply_payload_rcv_len = 0;
1527         reply->result = ret;
1528         job->reply_len = sizeof(uint32_t);
1529         bsg_job_done(job, ret, 0);
1530         return 0;
1531 }
1532
1533 /**
1534  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1535  * @shost: shost for iscsi_host
1536  * @ihost: iscsi_cls_host adding the structures to
1537  */
1538 static int
1539 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1540 {
1541         struct device *dev = &shost->shost_gendev;
1542         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1543         struct request_queue *q;
1544         char bsg_name[20];
1545
1546         if (!i->iscsi_transport->bsg_request)
1547                 return -ENOTSUPP;
1548
1549         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1550         q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1551         if (IS_ERR(q)) {
1552                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1553                              "initialize - no request queue\n");
1554                 return PTR_ERR(q);
1555         }
1556         __scsi_init_queue(shost, q);
1557
1558         ihost->bsg_q = q;
1559         return 0;
1560 }
1561
1562 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1563                             struct device *cdev)
1564 {
1565         struct Scsi_Host *shost = dev_to_shost(dev);
1566         struct iscsi_cls_host *ihost = shost->shost_data;
1567
1568         memset(ihost, 0, sizeof(*ihost));
1569         atomic_set(&ihost->nr_scans, 0);
1570         mutex_init(&ihost->mutex);
1571
1572         iscsi_bsg_host_add(shost, ihost);
1573         /* ignore any bsg add error - we just can't do sgio */
1574
1575         return 0;
1576 }
1577
1578 static int iscsi_remove_host(struct transport_container *tc,
1579                              struct device *dev, struct device *cdev)
1580 {
1581         struct Scsi_Host *shost = dev_to_shost(dev);
1582         struct iscsi_cls_host *ihost = shost->shost_data;
1583
1584         bsg_remove_queue(ihost->bsg_q);
1585         return 0;
1586 }
1587
1588 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1589                                "iscsi_host",
1590                                iscsi_setup_host,
1591                                iscsi_remove_host,
1592                                NULL);
1593
1594 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1595                                "iscsi_session",
1596                                NULL,
1597                                NULL,
1598                                NULL);
1599
1600 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1601                                "iscsi_connection",
1602                                NULL,
1603                                NULL,
1604                                NULL);
1605
1606 static struct sock *nls;
1607 static DEFINE_MUTEX(rx_queue_mutex);
1608
1609 static LIST_HEAD(sesslist);
1610 static DEFINE_SPINLOCK(sesslock);
1611 static LIST_HEAD(connlist);
1612 static DEFINE_SPINLOCK(connlock);
1613
1614 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1615 {
1616         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1617         return sess->sid;
1618 }
1619
1620 /*
1621  * Returns the matching session to a given sid
1622  */
1623 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1624 {
1625         unsigned long flags;
1626         struct iscsi_cls_session *sess;
1627
1628         spin_lock_irqsave(&sesslock, flags);
1629         list_for_each_entry(sess, &sesslist, sess_list) {
1630                 if (sess->sid == sid) {
1631                         spin_unlock_irqrestore(&sesslock, flags);
1632                         return sess;
1633                 }
1634         }
1635         spin_unlock_irqrestore(&sesslock, flags);
1636         return NULL;
1637 }
1638
1639 /*
1640  * Returns the matching connection to a given sid / cid tuple
1641  */
1642 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1643 {
1644         unsigned long flags;
1645         struct iscsi_cls_conn *conn;
1646
1647         spin_lock_irqsave(&connlock, flags);
1648         list_for_each_entry(conn, &connlist, conn_list) {
1649                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1650                         spin_unlock_irqrestore(&connlock, flags);
1651                         return conn;
1652                 }
1653         }
1654         spin_unlock_irqrestore(&connlock, flags);
1655         return NULL;
1656 }
1657
1658 /*
1659  * The following functions can be used by LLDs that allocate
1660  * their own scsi_hosts or by software iscsi LLDs
1661  */
1662 static struct {
1663         int value;
1664         char *name;
1665 } iscsi_session_state_names[] = {
1666         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1667         { ISCSI_SESSION_FAILED,         "FAILED" },
1668         { ISCSI_SESSION_FREE,           "FREE" },
1669 };
1670
1671 static const char *iscsi_session_state_name(int state)
1672 {
1673         int i;
1674         char *name = NULL;
1675
1676         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1677                 if (iscsi_session_state_names[i].value == state) {
1678                         name = iscsi_session_state_names[i].name;
1679                         break;
1680                 }
1681         }
1682         return name;
1683 }
1684
1685 int iscsi_session_chkready(struct iscsi_cls_session *session)
1686 {
1687         unsigned long flags;
1688         int err;
1689
1690         spin_lock_irqsave(&session->lock, flags);
1691         switch (session->state) {
1692         case ISCSI_SESSION_LOGGED_IN:
1693                 err = 0;
1694                 break;
1695         case ISCSI_SESSION_FAILED:
1696                 err = DID_IMM_RETRY << 16;
1697                 break;
1698         case ISCSI_SESSION_FREE:
1699                 err = DID_TRANSPORT_FAILFAST << 16;
1700                 break;
1701         default:
1702                 err = DID_NO_CONNECT << 16;
1703                 break;
1704         }
1705         spin_unlock_irqrestore(&session->lock, flags);
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 /**
1759  * iscsi_scan_finished - helper to report when running scans are done
1760  * @shost: scsi host
1761  * @time: scan run time
1762  *
1763  * This function can be used by drives like qla4xxx to report to the scsi
1764  * layer when the scans it kicked off at module load time are done.
1765  */
1766 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1767 {
1768         struct iscsi_cls_host *ihost = shost->shost_data;
1769         /*
1770          * qla4xxx will have kicked off some session unblocks before calling
1771          * scsi_scan_host, so just wait for them to complete.
1772          */
1773         return !atomic_read(&ihost->nr_scans);
1774 }
1775 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1776
1777 struct iscsi_scan_data {
1778         unsigned int channel;
1779         unsigned int id;
1780         u64 lun;
1781         enum scsi_scan_mode rescan;
1782 };
1783
1784 static int iscsi_user_scan_session(struct device *dev, void *data)
1785 {
1786         struct iscsi_scan_data *scan_data = data;
1787         struct iscsi_cls_session *session;
1788         struct Scsi_Host *shost;
1789         struct iscsi_cls_host *ihost;
1790         unsigned long flags;
1791         unsigned int id;
1792
1793         if (!iscsi_is_session_dev(dev))
1794                 return 0;
1795
1796         session = iscsi_dev_to_session(dev);
1797
1798         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1799
1800         shost = iscsi_session_to_shost(session);
1801         ihost = shost->shost_data;
1802
1803         mutex_lock(&ihost->mutex);
1804         spin_lock_irqsave(&session->lock, flags);
1805         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1806                 spin_unlock_irqrestore(&session->lock, flags);
1807                 goto user_scan_exit;
1808         }
1809         id = session->target_id;
1810         spin_unlock_irqrestore(&session->lock, flags);
1811
1812         if (id != ISCSI_MAX_TARGET) {
1813                 if ((scan_data->channel == SCAN_WILD_CARD ||
1814                      scan_data->channel == 0) &&
1815                     (scan_data->id == SCAN_WILD_CARD ||
1816                      scan_data->id == id))
1817                         scsi_scan_target(&session->dev, 0, id,
1818                                          scan_data->lun, scan_data->rescan);
1819         }
1820
1821 user_scan_exit:
1822         mutex_unlock(&ihost->mutex);
1823         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1824         return 0;
1825 }
1826
1827 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1828                            uint id, u64 lun)
1829 {
1830         struct iscsi_scan_data scan_data;
1831
1832         scan_data.channel = channel;
1833         scan_data.id = id;
1834         scan_data.lun = lun;
1835         scan_data.rescan = SCSI_SCAN_MANUAL;
1836
1837         return device_for_each_child(&shost->shost_gendev, &scan_data,
1838                                      iscsi_user_scan_session);
1839 }
1840
1841 static void iscsi_scan_session(struct work_struct *work)
1842 {
1843         struct iscsi_cls_session *session =
1844                         container_of(work, struct iscsi_cls_session, scan_work);
1845         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1846         struct iscsi_cls_host *ihost = shost->shost_data;
1847         struct iscsi_scan_data scan_data;
1848
1849         scan_data.channel = 0;
1850         scan_data.id = SCAN_WILD_CARD;
1851         scan_data.lun = SCAN_WILD_CARD;
1852         scan_data.rescan = SCSI_SCAN_RESCAN;
1853
1854         iscsi_user_scan_session(&session->dev, &scan_data);
1855         atomic_dec(&ihost->nr_scans);
1856 }
1857
1858 /**
1859  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1860  * @cmd: scsi cmd passed to scsi eh handler
1861  *
1862  * If the session is down this function will wait for the recovery
1863  * timer to fire or for the session to be logged back in. If the
1864  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1865  * should pass this error value to the scsi eh.
1866  */
1867 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1868 {
1869         struct iscsi_cls_session *session =
1870                         starget_to_session(scsi_target(cmd->device));
1871         unsigned long flags;
1872         int ret = 0;
1873
1874         spin_lock_irqsave(&session->lock, flags);
1875         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1876                 if (session->state == ISCSI_SESSION_FREE) {
1877                         ret = FAST_IO_FAIL;
1878                         break;
1879                 }
1880                 spin_unlock_irqrestore(&session->lock, flags);
1881                 msleep(1000);
1882                 spin_lock_irqsave(&session->lock, flags);
1883         }
1884         spin_unlock_irqrestore(&session->lock, flags);
1885         return ret;
1886 }
1887 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1888
1889 static void session_recovery_timedout(struct work_struct *work)
1890 {
1891         struct iscsi_cls_session *session =
1892                 container_of(work, struct iscsi_cls_session,
1893                              recovery_work.work);
1894         unsigned long flags;
1895
1896         iscsi_cls_session_printk(KERN_INFO, session,
1897                                  "session recovery timed out after %d secs\n",
1898                                  session->recovery_tmo);
1899
1900         spin_lock_irqsave(&session->lock, flags);
1901         switch (session->state) {
1902         case ISCSI_SESSION_FAILED:
1903                 session->state = ISCSI_SESSION_FREE;
1904                 break;
1905         case ISCSI_SESSION_LOGGED_IN:
1906         case ISCSI_SESSION_FREE:
1907                 /* we raced with the unblock's flush */
1908                 spin_unlock_irqrestore(&session->lock, flags);
1909                 return;
1910         }
1911         spin_unlock_irqrestore(&session->lock, flags);
1912
1913         if (session->transport->session_recovery_timedout)
1914                 session->transport->session_recovery_timedout(session);
1915
1916         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1917         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1918         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1919 }
1920
1921 static void __iscsi_unblock_session(struct work_struct *work)
1922 {
1923         struct iscsi_cls_session *session =
1924                         container_of(work, struct iscsi_cls_session,
1925                                      unblock_work);
1926         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1927         struct iscsi_cls_host *ihost = shost->shost_data;
1928         unsigned long flags;
1929
1930         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1931         /*
1932          * The recovery and unblock work get run from the same workqueue,
1933          * so try to cancel it if it was going to run after this unblock.
1934          */
1935         cancel_delayed_work(&session->recovery_work);
1936         spin_lock_irqsave(&session->lock, flags);
1937         session->state = ISCSI_SESSION_LOGGED_IN;
1938         spin_unlock_irqrestore(&session->lock, flags);
1939         /* start IO */
1940         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1941         /*
1942          * Only do kernel scanning if the driver is properly hooked into
1943          * the async scanning code (drivers like iscsi_tcp do login and
1944          * scanning from userspace).
1945          */
1946         if (shost->hostt->scan_finished) {
1947                 if (scsi_queue_work(shost, &session->scan_work))
1948                         atomic_inc(&ihost->nr_scans);
1949         }
1950         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1951 }
1952
1953 /**
1954  * iscsi_unblock_session - set a session as logged in and start IO.
1955  * @session: iscsi session
1956  *
1957  * Mark a session as ready to accept IO.
1958  */
1959 void iscsi_unblock_session(struct iscsi_cls_session *session)
1960 {
1961         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1962         /*
1963          * make sure all the events have completed before tell the driver
1964          * it is safe
1965          */
1966         flush_workqueue(iscsi_eh_timer_workq);
1967 }
1968 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1969
1970 static void __iscsi_block_session(struct work_struct *work)
1971 {
1972         struct iscsi_cls_session *session =
1973                         container_of(work, struct iscsi_cls_session,
1974                                      block_work);
1975         unsigned long flags;
1976
1977         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1978         spin_lock_irqsave(&session->lock, flags);
1979         session->state = ISCSI_SESSION_FAILED;
1980         spin_unlock_irqrestore(&session->lock, flags);
1981         scsi_target_block(&session->dev);
1982         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1983         if (session->recovery_tmo >= 0)
1984                 queue_delayed_work(iscsi_eh_timer_workq,
1985                                    &session->recovery_work,
1986                                    session->recovery_tmo * HZ);
1987 }
1988
1989 void iscsi_block_session(struct iscsi_cls_session *session)
1990 {
1991         queue_work(iscsi_eh_timer_workq, &session->block_work);
1992 }
1993 EXPORT_SYMBOL_GPL(iscsi_block_session);
1994
1995 static void __iscsi_unbind_session(struct work_struct *work)
1996 {
1997         struct iscsi_cls_session *session =
1998                         container_of(work, struct iscsi_cls_session,
1999                                      unbind_work);
2000         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2001         struct iscsi_cls_host *ihost = shost->shost_data;
2002         unsigned long flags;
2003         unsigned int target_id;
2004
2005         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2006
2007         /* Prevent new scans and make sure scanning is not in progress */
2008         mutex_lock(&ihost->mutex);
2009         spin_lock_irqsave(&session->lock, flags);
2010         if (session->target_id == ISCSI_MAX_TARGET) {
2011                 spin_unlock_irqrestore(&session->lock, flags);
2012                 mutex_unlock(&ihost->mutex);
2013                 return;
2014         }
2015
2016         target_id = session->target_id;
2017         session->target_id = ISCSI_MAX_TARGET;
2018         spin_unlock_irqrestore(&session->lock, flags);
2019         mutex_unlock(&ihost->mutex);
2020
2021         if (session->ida_used)
2022                 ida_simple_remove(&iscsi_sess_ida, target_id);
2023
2024         scsi_remove_target(&session->dev);
2025         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2026         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2027 }
2028
2029 struct iscsi_cls_session *
2030 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2031                     int dd_size)
2032 {
2033         struct iscsi_cls_session *session;
2034
2035         session = kzalloc(sizeof(*session) + dd_size,
2036                           GFP_KERNEL);
2037         if (!session)
2038                 return NULL;
2039
2040         session->transport = transport;
2041         session->creator = -1;
2042         session->recovery_tmo = 120;
2043         session->recovery_tmo_sysfs_override = false;
2044         session->state = ISCSI_SESSION_FREE;
2045         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2046         INIT_LIST_HEAD(&session->sess_list);
2047         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2048         INIT_WORK(&session->block_work, __iscsi_block_session);
2049         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2050         INIT_WORK(&session->scan_work, iscsi_scan_session);
2051         spin_lock_init(&session->lock);
2052
2053         /* this is released in the dev's release function */
2054         scsi_host_get(shost);
2055         session->dev.parent = &shost->shost_gendev;
2056         session->dev.release = iscsi_session_release;
2057         device_initialize(&session->dev);
2058         if (dd_size)
2059                 session->dd_data = &session[1];
2060
2061         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2062         return session;
2063 }
2064 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2065
2066 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2067 {
2068         unsigned long flags;
2069         int id = 0;
2070         int err;
2071
2072         session->sid = atomic_add_return(1, &iscsi_session_nr);
2073
2074         if (target_id == ISCSI_MAX_TARGET) {
2075                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2076
2077                 if (id < 0) {
2078                         iscsi_cls_session_printk(KERN_ERR, session,
2079                                         "Failure in Target ID Allocation\n");
2080                         return id;
2081                 }
2082                 session->target_id = (unsigned int)id;
2083                 session->ida_used = true;
2084         } else
2085                 session->target_id = target_id;
2086
2087         dev_set_name(&session->dev, "session%u", session->sid);
2088         err = device_add(&session->dev);
2089         if (err) {
2090                 iscsi_cls_session_printk(KERN_ERR, session,
2091                                          "could not register session's dev\n");
2092                 goto release_ida;
2093         }
2094         transport_register_device(&session->dev);
2095
2096         spin_lock_irqsave(&sesslock, flags);
2097         list_add(&session->sess_list, &sesslist);
2098         spin_unlock_irqrestore(&sesslock, flags);
2099
2100         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2101         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2102         return 0;
2103
2104 release_ida:
2105         if (session->ida_used)
2106                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2107
2108         return err;
2109 }
2110 EXPORT_SYMBOL_GPL(iscsi_add_session);
2111
2112 /**
2113  * iscsi_create_session - create iscsi class session
2114  * @shost: scsi host
2115  * @transport: iscsi transport
2116  * @dd_size: private driver data size
2117  * @target_id: which target
2118  *
2119  * This can be called from a LLD or iscsi_transport.
2120  */
2121 struct iscsi_cls_session *
2122 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2123                      int dd_size, unsigned int target_id)
2124 {
2125         struct iscsi_cls_session *session;
2126
2127         session = iscsi_alloc_session(shost, transport, dd_size);
2128         if (!session)
2129                 return NULL;
2130
2131         if (iscsi_add_session(session, target_id)) {
2132                 iscsi_free_session(session);
2133                 return NULL;
2134         }
2135         return session;
2136 }
2137 EXPORT_SYMBOL_GPL(iscsi_create_session);
2138
2139 static void iscsi_conn_release(struct device *dev)
2140 {
2141         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2142         struct device *parent = conn->dev.parent;
2143
2144         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2145         kfree(conn);
2146         put_device(parent);
2147 }
2148
2149 static int iscsi_is_conn_dev(const struct device *dev)
2150 {
2151         return dev->release == iscsi_conn_release;
2152 }
2153
2154 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2155 {
2156         if (!iscsi_is_conn_dev(dev))
2157                 return 0;
2158         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2159 }
2160
2161 void iscsi_remove_session(struct iscsi_cls_session *session)
2162 {
2163         unsigned long flags;
2164         int err;
2165
2166         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2167
2168         spin_lock_irqsave(&sesslock, flags);
2169         list_del(&session->sess_list);
2170         spin_unlock_irqrestore(&sesslock, flags);
2171
2172         /* make sure there are no blocks/unblocks queued */
2173         flush_workqueue(iscsi_eh_timer_workq);
2174         /* make sure the timedout callout is not running */
2175         if (!cancel_delayed_work(&session->recovery_work))
2176                 flush_workqueue(iscsi_eh_timer_workq);
2177         /*
2178          * If we are blocked let commands flow again. The lld or iscsi
2179          * layer should set up the queuecommand to fail commands.
2180          * We assume that LLD will not be calling block/unblock while
2181          * removing the session.
2182          */
2183         spin_lock_irqsave(&session->lock, flags);
2184         session->state = ISCSI_SESSION_FREE;
2185         spin_unlock_irqrestore(&session->lock, flags);
2186
2187         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2188         /* flush running scans then delete devices */
2189         flush_work(&session->scan_work);
2190         /* flush running unbind operations */
2191         flush_work(&session->unbind_work);
2192         __iscsi_unbind_session(&session->unbind_work);
2193
2194         /* hw iscsi may not have removed all connections from session */
2195         err = device_for_each_child(&session->dev, NULL,
2196                                     iscsi_iter_destroy_conn_fn);
2197         if (err)
2198                 iscsi_cls_session_printk(KERN_ERR, session,
2199                                          "Could not delete all connections "
2200                                          "for session. Error %d.\n", err);
2201
2202         transport_unregister_device(&session->dev);
2203
2204         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2205         device_del(&session->dev);
2206 }
2207 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2208
2209 void iscsi_free_session(struct iscsi_cls_session *session)
2210 {
2211         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2212         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2213         put_device(&session->dev);
2214 }
2215 EXPORT_SYMBOL_GPL(iscsi_free_session);
2216
2217 /**
2218  * iscsi_create_conn - create iscsi class connection
2219  * @session: iscsi cls session
2220  * @dd_size: private driver data size
2221  * @cid: connection id
2222  *
2223  * This can be called from a LLD or iscsi_transport. The connection
2224  * is child of the session so cid must be unique for all connections
2225  * on the session.
2226  *
2227  * Since we do not support MCS, cid will normally be zero. In some cases
2228  * for software iscsi we could be trying to preallocate a connection struct
2229  * in which case there could be two connection structs and cid would be
2230  * non-zero.
2231  */
2232 struct iscsi_cls_conn *
2233 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2234 {
2235         struct iscsi_transport *transport = session->transport;
2236         struct iscsi_cls_conn *conn;
2237         unsigned long flags;
2238         int err;
2239
2240         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2241         if (!conn)
2242                 return NULL;
2243         if (dd_size)
2244                 conn->dd_data = &conn[1];
2245
2246         mutex_init(&conn->ep_mutex);
2247         INIT_LIST_HEAD(&conn->conn_list);
2248         conn->transport = transport;
2249         conn->cid = cid;
2250
2251         /* this is released in the dev's release function */
2252         if (!get_device(&session->dev))
2253                 goto free_conn;
2254
2255         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2256         conn->dev.parent = &session->dev;
2257         conn->dev.release = iscsi_conn_release;
2258         err = device_register(&conn->dev);
2259         if (err) {
2260                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2261                                          "register connection's dev\n");
2262                 goto release_parent_ref;
2263         }
2264         transport_register_device(&conn->dev);
2265
2266         spin_lock_irqsave(&connlock, flags);
2267         list_add(&conn->conn_list, &connlist);
2268         spin_unlock_irqrestore(&connlock, flags);
2269
2270         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2271         return conn;
2272
2273 release_parent_ref:
2274         put_device(&session->dev);
2275 free_conn:
2276         kfree(conn);
2277         return NULL;
2278 }
2279
2280 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2281
2282 /**
2283  * iscsi_destroy_conn - destroy iscsi class connection
2284  * @conn: iscsi cls session
2285  *
2286  * This can be called from a LLD or iscsi_transport.
2287  */
2288 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2289 {
2290         unsigned long flags;
2291
2292         spin_lock_irqsave(&connlock, flags);
2293         list_del(&conn->conn_list);
2294         spin_unlock_irqrestore(&connlock, flags);
2295
2296         transport_unregister_device(&conn->dev);
2297         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2298         device_unregister(&conn->dev);
2299         return 0;
2300 }
2301 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2302
2303 /*
2304  * iscsi interface functions
2305  */
2306 static struct iscsi_internal *
2307 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2308 {
2309         struct iscsi_internal *priv;
2310         unsigned long flags;
2311
2312         spin_lock_irqsave(&iscsi_transport_lock, flags);
2313         list_for_each_entry(priv, &iscsi_transports, list) {
2314                 if (tt == priv->iscsi_transport) {
2315                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2316                         return priv;
2317                 }
2318         }
2319         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2320         return NULL;
2321 }
2322
2323 static int
2324 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2325 {
2326         return nlmsg_multicast(nls, skb, 0, group, gfp);
2327 }
2328
2329 static int
2330 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2331 {
2332         return nlmsg_unicast(nls, skb, portid);
2333 }
2334
2335 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2336                    char *data, uint32_t data_size)
2337 {
2338         struct nlmsghdr *nlh;
2339         struct sk_buff *skb;
2340         struct iscsi_uevent *ev;
2341         char *pdu;
2342         struct iscsi_internal *priv;
2343         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2344                                    data_size);
2345
2346         priv = iscsi_if_transport_lookup(conn->transport);
2347         if (!priv)
2348                 return -EINVAL;
2349
2350         skb = alloc_skb(len, GFP_ATOMIC);
2351         if (!skb) {
2352                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2353                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2354                                       "control PDU: OOM\n");
2355                 return -ENOMEM;
2356         }
2357
2358         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2359         ev = nlmsg_data(nlh);
2360         memset(ev, 0, sizeof(*ev));
2361         ev->transport_handle = iscsi_handle(conn->transport);
2362         ev->type = ISCSI_KEVENT_RECV_PDU;
2363         ev->r.recv_req.cid = conn->cid;
2364         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2365         pdu = (char*)ev + sizeof(*ev);
2366         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2367         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2368
2369         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2370 }
2371 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2372
2373 int iscsi_offload_mesg(struct Scsi_Host *shost,
2374                        struct iscsi_transport *transport, uint32_t type,
2375                        char *data, uint16_t data_size)
2376 {
2377         struct nlmsghdr *nlh;
2378         struct sk_buff *skb;
2379         struct iscsi_uevent *ev;
2380         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2381
2382         skb = alloc_skb(len, GFP_ATOMIC);
2383         if (!skb) {
2384                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2385                 return -ENOMEM;
2386         }
2387
2388         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2389         ev = nlmsg_data(nlh);
2390         memset(ev, 0, sizeof(*ev));
2391         ev->type = type;
2392         ev->transport_handle = iscsi_handle(transport);
2393         switch (type) {
2394         case ISCSI_KEVENT_PATH_REQ:
2395                 ev->r.req_path.host_no = shost->host_no;
2396                 break;
2397         case ISCSI_KEVENT_IF_DOWN:
2398                 ev->r.notify_if_down.host_no = shost->host_no;
2399                 break;
2400         }
2401
2402         memcpy((char *)ev + sizeof(*ev), data, data_size);
2403
2404         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2405 }
2406 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2407
2408 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2409 {
2410         struct nlmsghdr *nlh;
2411         struct sk_buff  *skb;
2412         struct iscsi_uevent *ev;
2413         struct iscsi_internal *priv;
2414         int len = nlmsg_total_size(sizeof(*ev));
2415
2416         priv = iscsi_if_transport_lookup(conn->transport);
2417         if (!priv)
2418                 return;
2419
2420         skb = alloc_skb(len, GFP_ATOMIC);
2421         if (!skb) {
2422                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2423                                       "conn error (%d)\n", error);
2424                 return;
2425         }
2426
2427         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2428         ev = nlmsg_data(nlh);
2429         ev->transport_handle = iscsi_handle(conn->transport);
2430         ev->type = ISCSI_KEVENT_CONN_ERROR;
2431         ev->r.connerror.error = error;
2432         ev->r.connerror.cid = conn->cid;
2433         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2434
2435         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2436
2437         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2438                               error);
2439 }
2440 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2441
2442 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2443                             enum iscsi_conn_state state)
2444 {
2445         struct nlmsghdr *nlh;
2446         struct sk_buff  *skb;
2447         struct iscsi_uevent *ev;
2448         struct iscsi_internal *priv;
2449         int len = nlmsg_total_size(sizeof(*ev));
2450
2451         priv = iscsi_if_transport_lookup(conn->transport);
2452         if (!priv)
2453                 return;
2454
2455         skb = alloc_skb(len, GFP_ATOMIC);
2456         if (!skb) {
2457                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2458                                       "conn login (%d)\n", state);
2459                 return;
2460         }
2461
2462         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2463         ev = nlmsg_data(nlh);
2464         ev->transport_handle = iscsi_handle(conn->transport);
2465         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2466         ev->r.conn_login.state = state;
2467         ev->r.conn_login.cid = conn->cid;
2468         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2469         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2470
2471         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2472                               state);
2473 }
2474 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2475
2476 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2477                            enum iscsi_host_event_code code, uint32_t data_size,
2478                            uint8_t *data)
2479 {
2480         struct nlmsghdr *nlh;
2481         struct sk_buff *skb;
2482         struct iscsi_uevent *ev;
2483         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2484
2485         skb = alloc_skb(len, GFP_NOIO);
2486         if (!skb) {
2487                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2488                        host_no, code);
2489                 return;
2490         }
2491
2492         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2493         ev = nlmsg_data(nlh);
2494         ev->transport_handle = iscsi_handle(transport);
2495         ev->type = ISCSI_KEVENT_HOST_EVENT;
2496         ev->r.host_event.host_no = host_no;
2497         ev->r.host_event.code = code;
2498         ev->r.host_event.data_size = data_size;
2499
2500         if (data_size)
2501                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2502
2503         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2504 }
2505 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2506
2507 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2508                            uint32_t status, uint32_t pid, uint32_t data_size,
2509                            uint8_t *data)
2510 {
2511         struct nlmsghdr *nlh;
2512         struct sk_buff *skb;
2513         struct iscsi_uevent *ev;
2514         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2515
2516         skb = alloc_skb(len, GFP_NOIO);
2517         if (!skb) {
2518                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2519                 return;
2520         }
2521
2522         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2523         ev = nlmsg_data(nlh);
2524         ev->transport_handle = iscsi_handle(transport);
2525         ev->type = ISCSI_KEVENT_PING_COMP;
2526         ev->r.ping_comp.host_no = host_no;
2527         ev->r.ping_comp.status = status;
2528         ev->r.ping_comp.pid = pid;
2529         ev->r.ping_comp.data_size = data_size;
2530         memcpy((char *)ev + sizeof(*ev), data, data_size);
2531
2532         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2533 }
2534 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2535
2536 static int
2537 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2538 {
2539         struct sk_buff  *skb;
2540         struct nlmsghdr *nlh;
2541         int len = nlmsg_total_size(size);
2542
2543         skb = alloc_skb(len, GFP_ATOMIC);
2544         if (!skb) {
2545                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2546                 return -ENOMEM;
2547         }
2548
2549         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2550         memcpy(nlmsg_data(nlh), payload, size);
2551         return iscsi_unicast_skb(skb, portid);
2552 }
2553
2554 static int
2555 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2556 {
2557         struct iscsi_uevent *ev = nlmsg_data(nlh);
2558         struct iscsi_stats *stats;
2559         struct sk_buff *skbstat;
2560         struct iscsi_cls_conn *conn;
2561         struct nlmsghdr *nlhstat;
2562         struct iscsi_uevent *evstat;
2563         struct iscsi_internal *priv;
2564         int len = nlmsg_total_size(sizeof(*ev) +
2565                                    sizeof(struct iscsi_stats) +
2566                                    sizeof(struct iscsi_stats_custom) *
2567                                    ISCSI_STATS_CUSTOM_MAX);
2568         int err = 0;
2569
2570         priv = iscsi_if_transport_lookup(transport);
2571         if (!priv)
2572                 return -EINVAL;
2573
2574         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2575         if (!conn)
2576                 return -EEXIST;
2577
2578         do {
2579                 int actual_size;
2580
2581                 skbstat = alloc_skb(len, GFP_ATOMIC);
2582                 if (!skbstat) {
2583                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2584                                               "deliver stats: OOM\n");
2585                         return -ENOMEM;
2586                 }
2587
2588                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2589                                       (len - sizeof(*nlhstat)), 0);
2590                 evstat = nlmsg_data(nlhstat);
2591                 memset(evstat, 0, sizeof(*evstat));
2592                 evstat->transport_handle = iscsi_handle(conn->transport);
2593                 evstat->type = nlh->nlmsg_type;
2594                 evstat->u.get_stats.cid =
2595                         ev->u.get_stats.cid;
2596                 evstat->u.get_stats.sid =
2597                         ev->u.get_stats.sid;
2598                 stats = (struct iscsi_stats *)
2599                         ((char*)evstat + sizeof(*evstat));
2600                 memset(stats, 0, sizeof(*stats));
2601
2602                 transport->get_stats(conn, stats);
2603                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2604                                                sizeof(struct iscsi_stats) +
2605                                                sizeof(struct iscsi_stats_custom) *
2606                                                stats->custom_length);
2607                 actual_size -= sizeof(*nlhstat);
2608                 actual_size = nlmsg_msg_size(actual_size);
2609                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2610                 nlhstat->nlmsg_len = actual_size;
2611
2612                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2613                                           GFP_ATOMIC);
2614         } while (err < 0 && err != -ECONNREFUSED);
2615
2616         return err;
2617 }
2618
2619 /**
2620  * iscsi_session_event - send session destr. completion event
2621  * @session: iscsi class session
2622  * @event: type of event
2623  */
2624 int iscsi_session_event(struct iscsi_cls_session *session,
2625                         enum iscsi_uevent_e event)
2626 {
2627         struct iscsi_internal *priv;
2628         struct Scsi_Host *shost;
2629         struct iscsi_uevent *ev;
2630         struct sk_buff  *skb;
2631         struct nlmsghdr *nlh;
2632         int rc, len = nlmsg_total_size(sizeof(*ev));
2633
2634         priv = iscsi_if_transport_lookup(session->transport);
2635         if (!priv)
2636                 return -EINVAL;
2637         shost = iscsi_session_to_shost(session);
2638
2639         skb = alloc_skb(len, GFP_KERNEL);
2640         if (!skb) {
2641                 iscsi_cls_session_printk(KERN_ERR, session,
2642                                          "Cannot notify userspace of session "
2643                                          "event %u\n", event);
2644                 return -ENOMEM;
2645         }
2646
2647         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2648         ev = nlmsg_data(nlh);
2649         ev->transport_handle = iscsi_handle(session->transport);
2650
2651         ev->type = event;
2652         switch (event) {
2653         case ISCSI_KEVENT_DESTROY_SESSION:
2654                 ev->r.d_session.host_no = shost->host_no;
2655                 ev->r.d_session.sid = session->sid;
2656                 break;
2657         case ISCSI_KEVENT_CREATE_SESSION:
2658                 ev->r.c_session_ret.host_no = shost->host_no;
2659                 ev->r.c_session_ret.sid = session->sid;
2660                 break;
2661         case ISCSI_KEVENT_UNBIND_SESSION:
2662                 ev->r.unbind_session.host_no = shost->host_no;
2663                 ev->r.unbind_session.sid = session->sid;
2664                 break;
2665         default:
2666                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2667                                          "%u.\n", event);
2668                 kfree_skb(skb);
2669                 return -EINVAL;
2670         }
2671
2672         /*
2673          * this will occur if the daemon is not up, so we just warn
2674          * the user and when the daemon is restarted it will handle it
2675          */
2676         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2677         if (rc == -ESRCH)
2678                 iscsi_cls_session_printk(KERN_ERR, session,
2679                                          "Cannot notify userspace of session "
2680                                          "event %u. Check iscsi daemon\n",
2681                                          event);
2682
2683         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2684                                 event, rc);
2685         return rc;
2686 }
2687 EXPORT_SYMBOL_GPL(iscsi_session_event);
2688
2689 static int
2690 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2691                         struct iscsi_uevent *ev, pid_t pid,
2692                         uint32_t initial_cmdsn, uint16_t cmds_max,
2693                         uint16_t queue_depth)
2694 {
2695         struct iscsi_transport *transport = priv->iscsi_transport;
2696         struct iscsi_cls_session *session;
2697         struct Scsi_Host *shost;
2698
2699         session = transport->create_session(ep, cmds_max, queue_depth,
2700                                             initial_cmdsn);
2701         if (!session)
2702                 return -ENOMEM;
2703
2704         session->creator = pid;
2705         shost = iscsi_session_to_shost(session);
2706         ev->r.c_session_ret.host_no = shost->host_no;
2707         ev->r.c_session_ret.sid = session->sid;
2708         ISCSI_DBG_TRANS_SESSION(session,
2709                                 "Completed creating transport session\n");
2710         return 0;
2711 }
2712
2713 static int
2714 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2715 {
2716         struct iscsi_cls_conn *conn;
2717         struct iscsi_cls_session *session;
2718
2719         session = iscsi_session_lookup(ev->u.c_conn.sid);
2720         if (!session) {
2721                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2722                        ev->u.c_conn.sid);
2723                 return -EINVAL;
2724         }
2725
2726         conn = transport->create_conn(session, ev->u.c_conn.cid);
2727         if (!conn) {
2728                 iscsi_cls_session_printk(KERN_ERR, session,
2729                                          "couldn't create a new connection.");
2730                 return -ENOMEM;
2731         }
2732
2733         ev->r.c_conn_ret.sid = session->sid;
2734         ev->r.c_conn_ret.cid = conn->cid;
2735
2736         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2737         return 0;
2738 }
2739
2740 static int
2741 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2742 {
2743         struct iscsi_cls_conn *conn;
2744
2745         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2746         if (!conn)
2747                 return -EINVAL;
2748
2749         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2750         if (transport->destroy_conn)
2751                 transport->destroy_conn(conn);
2752
2753         return 0;
2754 }
2755
2756 static int
2757 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2758 {
2759         char *data = (char*)ev + sizeof(*ev);
2760         struct iscsi_cls_conn *conn;
2761         struct iscsi_cls_session *session;
2762         int err = 0, value = 0;
2763
2764         session = iscsi_session_lookup(ev->u.set_param.sid);
2765         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2766         if (!conn || !session)
2767                 return -EINVAL;
2768
2769         switch (ev->u.set_param.param) {
2770         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2771                 sscanf(data, "%d", &value);
2772                 if (!session->recovery_tmo_sysfs_override)
2773                         session->recovery_tmo = value;
2774                 break;
2775         default:
2776                 err = transport->set_param(conn, ev->u.set_param.param,
2777                                            data, ev->u.set_param.len);
2778         }
2779
2780         return err;
2781 }
2782
2783 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2784                                struct iscsi_uevent *ev, int msg_type)
2785 {
2786         struct iscsi_endpoint *ep;
2787         struct sockaddr *dst_addr;
2788         struct Scsi_Host *shost = NULL;
2789         int non_blocking, err = 0;
2790
2791         if (!transport->ep_connect)
2792                 return -EINVAL;
2793
2794         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2795                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2796                 if (!shost) {
2797                         printk(KERN_ERR "ep connect failed. Could not find "
2798                                "host no %u\n",
2799                                ev->u.ep_connect_through_host.host_no);
2800                         return -ENODEV;
2801                 }
2802                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2803         } else
2804                 non_blocking = ev->u.ep_connect.non_blocking;
2805
2806         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2807         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2808         if (IS_ERR(ep)) {
2809                 err = PTR_ERR(ep);
2810                 goto release_host;
2811         }
2812
2813         ev->r.ep_connect_ret.handle = ep->id;
2814 release_host:
2815         if (shost)
2816                 scsi_host_put(shost);
2817         return err;
2818 }
2819
2820 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2821                                   u64 ep_handle)
2822 {
2823         struct iscsi_cls_conn *conn;
2824         struct iscsi_endpoint *ep;
2825
2826         if (!transport->ep_disconnect)
2827                 return -EINVAL;
2828
2829         ep = iscsi_lookup_endpoint(ep_handle);
2830         if (!ep)
2831                 return -EINVAL;
2832         conn = ep->conn;
2833         if (conn) {
2834                 mutex_lock(&conn->ep_mutex);
2835                 conn->ep = NULL;
2836                 mutex_unlock(&conn->ep_mutex);
2837         }
2838
2839         transport->ep_disconnect(ep);
2840         return 0;
2841 }
2842
2843 static int
2844 iscsi_if_transport_ep(struct iscsi_transport *transport,
2845                       struct iscsi_uevent *ev, int msg_type)
2846 {
2847         struct iscsi_endpoint *ep;
2848         int rc = 0;
2849
2850         switch (msg_type) {
2851         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2852         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2853                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
2854                 break;
2855         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2856                 if (!transport->ep_poll)
2857                         return -EINVAL;
2858
2859                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2860                 if (!ep)
2861                         return -EINVAL;
2862
2863                 ev->r.retcode = transport->ep_poll(ep,
2864                                                    ev->u.ep_poll.timeout_ms);
2865                 break;
2866         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2867                 rc = iscsi_if_ep_disconnect(transport,
2868                                             ev->u.ep_disconnect.ep_handle);
2869                 break;
2870         }
2871         return rc;
2872 }
2873
2874 static int
2875 iscsi_tgt_dscvr(struct iscsi_transport *transport,
2876                 struct iscsi_uevent *ev)
2877 {
2878         struct Scsi_Host *shost;
2879         struct sockaddr *dst_addr;
2880         int err;
2881
2882         if (!transport->tgt_dscvr)
2883                 return -EINVAL;
2884
2885         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
2886         if (!shost) {
2887                 printk(KERN_ERR "target discovery could not find host no %u\n",
2888                        ev->u.tgt_dscvr.host_no);
2889                 return -ENODEV;
2890         }
2891
2892
2893         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2894         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
2895                                    ev->u.tgt_dscvr.enable, dst_addr);
2896         scsi_host_put(shost);
2897         return err;
2898 }
2899
2900 static int
2901 iscsi_set_host_param(struct iscsi_transport *transport,
2902                      struct iscsi_uevent *ev)
2903 {
2904         char *data = (char*)ev + sizeof(*ev);
2905         struct Scsi_Host *shost;
2906         int err;
2907
2908         if (!transport->set_host_param)
2909                 return -ENOSYS;
2910
2911         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
2912         if (!shost) {
2913                 printk(KERN_ERR "set_host_param could not find host no %u\n",
2914                        ev->u.set_host_param.host_no);
2915                 return -ENODEV;
2916         }
2917
2918         err = transport->set_host_param(shost, ev->u.set_host_param.param,
2919                                         data, ev->u.set_host_param.len);
2920         scsi_host_put(shost);
2921         return err;
2922 }
2923
2924 static int
2925 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2926 {
2927         struct Scsi_Host *shost;
2928         struct iscsi_path *params;
2929         int err;
2930
2931         if (!transport->set_path)
2932                 return -ENOSYS;
2933
2934         shost = scsi_host_lookup(ev->u.set_path.host_no);
2935         if (!shost) {
2936                 printk(KERN_ERR "set path could not find host no %u\n",
2937                        ev->u.set_path.host_no);
2938                 return -ENODEV;
2939         }
2940
2941         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
2942         err = transport->set_path(shost, params);
2943
2944         scsi_host_put(shost);
2945         return err;
2946 }
2947
2948 static int
2949 iscsi_set_iface_params(struct iscsi_transport *transport,
2950                        struct iscsi_uevent *ev, uint32_t len)
2951 {
2952         char *data = (char *)ev + sizeof(*ev);
2953         struct Scsi_Host *shost;
2954         int err;
2955
2956         if (!transport->set_iface_param)
2957                 return -ENOSYS;
2958
2959         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
2960         if (!shost) {
2961                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
2962                        ev->u.set_iface_params.host_no);
2963                 return -ENODEV;
2964         }
2965
2966         err = transport->set_iface_param(shost, data, len);
2967         scsi_host_put(shost);
2968         return err;
2969 }
2970
2971 static int
2972 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2973 {
2974         struct Scsi_Host *shost;
2975         struct sockaddr *dst_addr;
2976         int err;
2977
2978         if (!transport->send_ping)
2979                 return -ENOSYS;
2980
2981         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
2982         if (!shost) {
2983                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
2984                        ev->u.iscsi_ping.host_no);
2985                 return -ENODEV;
2986         }
2987
2988         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
2989         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
2990                                    ev->u.iscsi_ping.iface_type,
2991                                    ev->u.iscsi_ping.payload_size,
2992                                    ev->u.iscsi_ping.pid,
2993                                    dst_addr);
2994         scsi_host_put(shost);
2995         return err;
2996 }
2997
2998 static int
2999 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3000 {
3001         struct iscsi_uevent *ev = nlmsg_data(nlh);
3002         struct Scsi_Host *shost = NULL;
3003         struct iscsi_chap_rec *chap_rec;
3004         struct iscsi_internal *priv;
3005         struct sk_buff *skbchap;
3006         struct nlmsghdr *nlhchap;
3007         struct iscsi_uevent *evchap;
3008         uint32_t chap_buf_size;
3009         int len, err = 0;
3010         char *buf;
3011
3012         if (!transport->get_chap)
3013                 return -EINVAL;
3014
3015         priv = iscsi_if_transport_lookup(transport);
3016         if (!priv)
3017                 return -EINVAL;
3018
3019         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3020         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3021
3022         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3023         if (!shost) {
3024                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3025                        __func__, ev->u.get_chap.host_no);
3026                 return -ENODEV;
3027         }
3028
3029         do {
3030                 int actual_size;
3031
3032                 skbchap = alloc_skb(len, GFP_KERNEL);
3033                 if (!skbchap) {
3034                         printk(KERN_ERR "can not deliver chap: OOM\n");
3035                         err = -ENOMEM;
3036                         goto exit_get_chap;
3037                 }
3038
3039                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3040                                       (len - sizeof(*nlhchap)), 0);
3041                 evchap = nlmsg_data(nlhchap);
3042                 memset(evchap, 0, sizeof(*evchap));
3043                 evchap->transport_handle = iscsi_handle(transport);
3044                 evchap->type = nlh->nlmsg_type;
3045                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3046                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3047                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3048                 buf = (char *)evchap + sizeof(*evchap);
3049                 memset(buf, 0, chap_buf_size);
3050
3051                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3052                                     &evchap->u.get_chap.num_entries, buf);
3053
3054                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3055                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3056                 nlhchap->nlmsg_len = actual_size;
3057
3058                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3059                                           GFP_KERNEL);
3060         } while (err < 0 && err != -ECONNREFUSED);
3061
3062 exit_get_chap:
3063         scsi_host_put(shost);
3064         return err;
3065 }
3066
3067 static int iscsi_set_chap(struct iscsi_transport *transport,
3068                           struct iscsi_uevent *ev, uint32_t len)
3069 {
3070         char *data = (char *)ev + sizeof(*ev);
3071         struct Scsi_Host *shost;
3072         int err = 0;
3073
3074         if (!transport->set_chap)
3075                 return -ENOSYS;
3076
3077         shost = scsi_host_lookup(ev->u.set_path.host_no);
3078         if (!shost) {
3079                 pr_err("%s could not find host no %u\n",
3080                        __func__, ev->u.set_path.host_no);
3081                 return -ENODEV;
3082         }
3083
3084         err = transport->set_chap(shost, data, len);
3085         scsi_host_put(shost);
3086         return err;
3087 }
3088
3089 static int iscsi_delete_chap(struct iscsi_transport *transport,
3090                              struct iscsi_uevent *ev)
3091 {
3092         struct Scsi_Host *shost;
3093         int err = 0;
3094
3095         if (!transport->delete_chap)
3096                 return -ENOSYS;
3097
3098         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3099         if (!shost) {
3100                 printk(KERN_ERR "%s could not find host no %u\n",
3101                        __func__, ev->u.delete_chap.host_no);
3102                 return -ENODEV;
3103         }
3104
3105         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3106         scsi_host_put(shost);
3107         return err;
3108 }
3109
3110 static const struct {
3111         enum iscsi_discovery_parent_type value;
3112         char                            *name;
3113 } iscsi_discovery_parent_names[] = {
3114         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3115         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3116         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3117 };
3118
3119 char *iscsi_get_discovery_parent_name(int parent_type)
3120 {
3121         int i;
3122         char *state = "Unknown!";
3123
3124         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3125                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3126                         state = iscsi_discovery_parent_names[i].name;
3127                         break;
3128                 }
3129         }
3130         return state;
3131 }
3132 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3133
3134 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3135                                      struct iscsi_uevent *ev, uint32_t len)
3136 {
3137         char *data = (char *)ev + sizeof(*ev);
3138         struct Scsi_Host *shost;
3139         struct iscsi_bus_flash_session *fnode_sess;
3140         struct iscsi_bus_flash_conn *fnode_conn;
3141         struct device *dev;
3142         uint32_t idx;
3143         int err = 0;
3144
3145         if (!transport->set_flashnode_param) {
3146                 err = -ENOSYS;
3147                 goto exit_set_fnode;
3148         }
3149
3150         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3151         if (!shost) {
3152                 pr_err("%s could not find host no %u\n",
3153                        __func__, ev->u.set_flashnode.host_no);
3154                 err = -ENODEV;
3155                 goto put_host;
3156         }
3157
3158         idx = ev->u.set_flashnode.flashnode_idx;
3159         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3160         if (!fnode_sess) {
3161                 pr_err("%s could not find flashnode %u for host no %u\n",
3162                        __func__, idx, ev->u.set_flashnode.host_no);
3163                 err = -ENODEV;
3164                 goto put_host;
3165         }
3166
3167         dev = iscsi_find_flashnode_conn(fnode_sess);
3168         if (!dev) {
3169                 err = -ENODEV;
3170                 goto put_sess;
3171         }
3172
3173         fnode_conn = iscsi_dev_to_flash_conn(dev);
3174         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3175         put_device(dev);
3176
3177 put_sess:
3178         put_device(&fnode_sess->dev);
3179
3180 put_host:
3181         scsi_host_put(shost);
3182
3183 exit_set_fnode:
3184         return err;
3185 }
3186
3187 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3188                                struct iscsi_uevent *ev, uint32_t len)
3189 {
3190         char *data = (char *)ev + sizeof(*ev);
3191         struct Scsi_Host *shost;
3192         int index;
3193         int err = 0;
3194
3195         if (!transport->new_flashnode) {
3196                 err = -ENOSYS;
3197                 goto exit_new_fnode;
3198         }
3199
3200         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3201         if (!shost) {
3202                 pr_err("%s could not find host no %u\n",
3203                        __func__, ev->u.new_flashnode.host_no);
3204                 err = -ENODEV;
3205                 goto put_host;
3206         }
3207
3208         index = transport->new_flashnode(shost, data, len);
3209
3210         if (index >= 0)
3211                 ev->r.new_flashnode_ret.flashnode_idx = index;
3212         else
3213                 err = -EIO;
3214
3215 put_host:
3216         scsi_host_put(shost);
3217
3218 exit_new_fnode:
3219         return err;
3220 }
3221
3222 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3223                                struct iscsi_uevent *ev)
3224 {
3225         struct Scsi_Host *shost;
3226         struct iscsi_bus_flash_session *fnode_sess;
3227         uint32_t idx;
3228         int err = 0;
3229
3230         if (!transport->del_flashnode) {
3231                 err = -ENOSYS;
3232                 goto exit_del_fnode;
3233         }
3234
3235         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3236         if (!shost) {
3237                 pr_err("%s could not find host no %u\n",
3238                        __func__, ev->u.del_flashnode.host_no);
3239                 err = -ENODEV;
3240                 goto put_host;
3241         }
3242
3243         idx = ev->u.del_flashnode.flashnode_idx;
3244         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3245         if (!fnode_sess) {
3246                 pr_err("%s could not find flashnode %u for host no %u\n",
3247                        __func__, idx, ev->u.del_flashnode.host_no);
3248                 err = -ENODEV;
3249                 goto put_host;
3250         }
3251
3252         err = transport->del_flashnode(fnode_sess);
3253         put_device(&fnode_sess->dev);
3254
3255 put_host:
3256         scsi_host_put(shost);
3257
3258 exit_del_fnode:
3259         return err;
3260 }
3261
3262 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3263                                  struct iscsi_uevent *ev)
3264 {
3265         struct Scsi_Host *shost;
3266         struct iscsi_bus_flash_session *fnode_sess;
3267         struct iscsi_bus_flash_conn *fnode_conn;
3268         struct device *dev;
3269         uint32_t idx;
3270         int err = 0;
3271
3272         if (!transport->login_flashnode) {
3273                 err = -ENOSYS;
3274                 goto exit_login_fnode;
3275         }
3276
3277         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3278         if (!shost) {
3279                 pr_err("%s could not find host no %u\n",
3280                        __func__, ev->u.login_flashnode.host_no);
3281                 err = -ENODEV;
3282                 goto put_host;
3283         }
3284
3285         idx = ev->u.login_flashnode.flashnode_idx;
3286         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3287         if (!fnode_sess) {
3288                 pr_err("%s could not find flashnode %u for host no %u\n",
3289                        __func__, idx, ev->u.login_flashnode.host_no);
3290                 err = -ENODEV;
3291                 goto put_host;
3292         }
3293
3294         dev = iscsi_find_flashnode_conn(fnode_sess);
3295         if (!dev) {
3296                 err = -ENODEV;
3297                 goto put_sess;
3298         }
3299
3300         fnode_conn = iscsi_dev_to_flash_conn(dev);
3301         err = transport->login_flashnode(fnode_sess, fnode_conn);
3302         put_device(dev);
3303
3304 put_sess:
3305         put_device(&fnode_sess->dev);
3306
3307 put_host:
3308         scsi_host_put(shost);
3309
3310 exit_login_fnode:
3311         return err;
3312 }
3313
3314 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3315                                   struct iscsi_uevent *ev)
3316 {
3317         struct Scsi_Host *shost;
3318         struct iscsi_bus_flash_session *fnode_sess;
3319         struct iscsi_bus_flash_conn *fnode_conn;
3320         struct device *dev;
3321         uint32_t idx;
3322         int err = 0;
3323
3324         if (!transport->logout_flashnode) {
3325                 err = -ENOSYS;
3326                 goto exit_logout_fnode;
3327         }
3328
3329         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3330         if (!shost) {
3331                 pr_err("%s could not find host no %u\n",
3332                        __func__, ev->u.logout_flashnode.host_no);
3333                 err = -ENODEV;
3334                 goto put_host;
3335         }
3336
3337         idx = ev->u.logout_flashnode.flashnode_idx;
3338         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3339         if (!fnode_sess) {
3340                 pr_err("%s could not find flashnode %u for host no %u\n",
3341                        __func__, idx, ev->u.logout_flashnode.host_no);
3342                 err = -ENODEV;
3343                 goto put_host;
3344         }
3345
3346         dev = iscsi_find_flashnode_conn(fnode_sess);
3347         if (!dev) {
3348                 err = -ENODEV;
3349                 goto put_sess;
3350         }
3351
3352         fnode_conn = iscsi_dev_to_flash_conn(dev);
3353
3354         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3355         put_device(dev);
3356
3357 put_sess:
3358         put_device(&fnode_sess->dev);
3359
3360 put_host:
3361         scsi_host_put(shost);
3362
3363 exit_logout_fnode:
3364         return err;
3365 }
3366
3367 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3368                                       struct iscsi_uevent *ev)
3369 {
3370         struct Scsi_Host *shost;
3371         struct iscsi_cls_session *session;
3372         int err = 0;
3373
3374         if (!transport->logout_flashnode_sid) {
3375                 err = -ENOSYS;
3376                 goto exit_logout_sid;
3377         }
3378
3379         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3380         if (!shost) {
3381                 pr_err("%s could not find host no %u\n",
3382                        __func__, ev->u.logout_flashnode.host_no);
3383                 err = -ENODEV;
3384                 goto put_host;
3385         }
3386
3387         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3388         if (!session) {
3389                 pr_err("%s could not find session id %u\n",
3390                        __func__, ev->u.logout_flashnode_sid.sid);
3391                 err = -EINVAL;
3392                 goto put_host;
3393         }
3394
3395         err = transport->logout_flashnode_sid(session);
3396
3397 put_host:
3398         scsi_host_put(shost);
3399
3400 exit_logout_sid:
3401         return err;
3402 }
3403
3404 static int
3405 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3406 {
3407         struct iscsi_uevent *ev = nlmsg_data(nlh);
3408         struct Scsi_Host *shost = NULL;
3409         struct iscsi_internal *priv;
3410         struct sk_buff *skbhost_stats;
3411         struct nlmsghdr *nlhhost_stats;
3412         struct iscsi_uevent *evhost_stats;
3413         int host_stats_size = 0;
3414         int len, err = 0;
3415         char *buf;
3416
3417         if (!transport->get_host_stats)
3418                 return -ENOSYS;
3419
3420         priv = iscsi_if_transport_lookup(transport);
3421         if (!priv)
3422                 return -EINVAL;
3423
3424         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3425         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3426
3427         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3428         if (!shost) {
3429                 pr_err("%s: failed. Could not find host no %u\n",
3430                        __func__, ev->u.get_host_stats.host_no);
3431                 return -ENODEV;
3432         }
3433
3434         do {
3435                 int actual_size;
3436
3437                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3438                 if (!skbhost_stats) {
3439                         pr_err("cannot deliver host stats: OOM\n");
3440                         err = -ENOMEM;
3441                         goto exit_host_stats;
3442                 }
3443
3444                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3445                                       (len - sizeof(*nlhhost_stats)), 0);
3446                 evhost_stats = nlmsg_data(nlhhost_stats);
3447                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3448                 evhost_stats->transport_handle = iscsi_handle(transport);
3449                 evhost_stats->type = nlh->nlmsg_type;
3450                 evhost_stats->u.get_host_stats.host_no =
3451                                         ev->u.get_host_stats.host_no;
3452                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3453                 memset(buf, 0, host_stats_size);
3454
3455                 err = transport->get_host_stats(shost, buf, host_stats_size);
3456                 if (err) {
3457                         kfree_skb(skbhost_stats);
3458                         goto exit_host_stats;
3459                 }
3460
3461                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3462                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3463                 nlhhost_stats->nlmsg_len = actual_size;
3464
3465                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3466                                           GFP_KERNEL);
3467         } while (err < 0 && err != -ECONNREFUSED);
3468
3469 exit_host_stats:
3470         scsi_host_put(shost);
3471         return err;
3472 }
3473
3474
3475 static int
3476 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3477 {
3478         int err = 0;
3479         u32 portid;
3480         struct iscsi_uevent *ev = nlmsg_data(nlh);
3481         struct iscsi_transport *transport = NULL;
3482         struct iscsi_internal *priv;
3483         struct iscsi_cls_session *session;
3484         struct iscsi_cls_conn *conn;
3485         struct iscsi_endpoint *ep = NULL;
3486
3487         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3488                 *group = ISCSI_NL_GRP_UIP;
3489         else
3490                 *group = ISCSI_NL_GRP_ISCSID;
3491
3492         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3493         if (!priv)
3494                 return -EINVAL;
3495         transport = priv->iscsi_transport;
3496
3497         if (!try_module_get(transport->owner))
3498                 return -EINVAL;
3499
3500         portid = NETLINK_CB(skb).portid;
3501
3502         switch (nlh->nlmsg_type) {
3503         case ISCSI_UEVENT_CREATE_SESSION:
3504                 err = iscsi_if_create_session(priv, ep, ev,
3505                                               portid,
3506                                               ev->u.c_session.initial_cmdsn,
3507                                               ev->u.c_session.cmds_max,
3508                                               ev->u.c_session.queue_depth);
3509                 break;
3510         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3511                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3512                 if (!ep) {
3513                         err = -EINVAL;
3514                         break;
3515                 }
3516
3517                 err = iscsi_if_create_session(priv, ep, ev,
3518                                         portid,
3519                                         ev->u.c_bound_session.initial_cmdsn,
3520                                         ev->u.c_bound_session.cmds_max,
3521                                         ev->u.c_bound_session.queue_depth);
3522                 break;
3523         case ISCSI_UEVENT_DESTROY_SESSION:
3524                 session = iscsi_session_lookup(ev->u.d_session.sid);
3525                 if (session)
3526                         transport->destroy_session(session);
3527                 else
3528                         err = -EINVAL;
3529                 break;
3530         case ISCSI_UEVENT_UNBIND_SESSION:
3531                 session = iscsi_session_lookup(ev->u.d_session.sid);
3532                 if (session)
3533                         scsi_queue_work(iscsi_session_to_shost(session),
3534                                         &session->unbind_work);
3535                 else
3536                         err = -EINVAL;
3537                 break;
3538         case ISCSI_UEVENT_CREATE_CONN:
3539                 err = iscsi_if_create_conn(transport, ev);
3540                 break;
3541         case ISCSI_UEVENT_DESTROY_CONN:
3542                 err = iscsi_if_destroy_conn(transport, ev);
3543                 break;
3544         case ISCSI_UEVENT_BIND_CONN:
3545                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3546                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3547
3548                 if (conn && conn->ep)
3549                         iscsi_if_ep_disconnect(transport, conn->ep->id);
3550
3551                 if (!session || !conn) {
3552                         err = -EINVAL;
3553                         break;
3554                 }
3555
3556                 ev->r.retcode = transport->bind_conn(session, conn,
3557                                                 ev->u.b_conn.transport_eph,
3558                                                 ev->u.b_conn.is_leading);
3559                 if (ev->r.retcode || !transport->ep_connect)
3560                         break;
3561
3562                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3563                 if (ep) {
3564                         ep->conn = conn;
3565
3566                         mutex_lock(&conn->ep_mutex);
3567                         conn->ep = ep;
3568                         mutex_unlock(&conn->ep_mutex);
3569                 } else
3570                         iscsi_cls_conn_printk(KERN_ERR, conn,
3571                                               "Could not set ep conn "
3572                                               "binding\n");
3573                 break;
3574         case ISCSI_UEVENT_SET_PARAM:
3575                 err = iscsi_set_param(transport, ev);
3576                 break;
3577         case ISCSI_UEVENT_START_CONN:
3578                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3579                 if (conn)
3580                         ev->r.retcode = transport->start_conn(conn);
3581                 else
3582                         err = -EINVAL;
3583                 break;
3584         case ISCSI_UEVENT_STOP_CONN:
3585                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3586                 if (conn)
3587                         transport->stop_conn(conn, ev->u.stop_conn.flag);
3588                 else
3589                         err = -EINVAL;
3590                 break;
3591         case ISCSI_UEVENT_SEND_PDU:
3592                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3593                 if (conn)
3594                         ev->r.retcode = transport->send_pdu(conn,
3595                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3596                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3597                                 ev->u.send_pdu.data_size);
3598                 else
3599                         err = -EINVAL;
3600                 break;
3601         case ISCSI_UEVENT_GET_STATS:
3602                 err = iscsi_if_get_stats(transport, nlh);
3603                 break;
3604         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3605         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3606         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3607         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3608                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3609                 break;
3610         case ISCSI_UEVENT_TGT_DSCVR:
3611                 err = iscsi_tgt_dscvr(transport, ev);
3612                 break;
3613         case ISCSI_UEVENT_SET_HOST_PARAM:
3614                 err = iscsi_set_host_param(transport, ev);
3615                 break;
3616         case ISCSI_UEVENT_PATH_UPDATE:
3617                 err = iscsi_set_path(transport, ev);
3618                 break;
3619         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3620                 err = iscsi_set_iface_params(transport, ev,
3621                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3622                 break;
3623         case ISCSI_UEVENT_PING:
3624                 err = iscsi_send_ping(transport, ev);
3625                 break;
3626         case ISCSI_UEVENT_GET_CHAP:
3627                 err = iscsi_get_chap(transport, nlh);
3628                 break;
3629         case ISCSI_UEVENT_DELETE_CHAP:
3630                 err = iscsi_delete_chap(transport, ev);
3631                 break;
3632         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3633                 err = iscsi_set_flashnode_param(transport, ev,
3634                                                 nlmsg_attrlen(nlh,
3635                                                               sizeof(*ev)));
3636                 break;
3637         case ISCSI_UEVENT_NEW_FLASHNODE:
3638                 err = iscsi_new_flashnode(transport, ev,
3639                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3640                 break;
3641         case ISCSI_UEVENT_DEL_FLASHNODE:
3642                 err = iscsi_del_flashnode(transport, ev);
3643                 break;
3644         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3645                 err = iscsi_login_flashnode(transport, ev);
3646                 break;
3647         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3648                 err = iscsi_logout_flashnode(transport, ev);
3649                 break;
3650         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3651                 err = iscsi_logout_flashnode_sid(transport, ev);
3652                 break;
3653         case ISCSI_UEVENT_SET_CHAP:
3654                 err = iscsi_set_chap(transport, ev,
3655                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3656                 break;
3657         case ISCSI_UEVENT_GET_HOST_STATS:
3658                 err = iscsi_get_host_stats(transport, nlh);
3659                 break;
3660         default:
3661                 err = -ENOSYS;
3662                 break;
3663         }
3664
3665         module_put(transport->owner);
3666         return err;
3667 }
3668
3669 /*
3670  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3671  * Malformed skbs with wrong lengths or invalid creds are not processed.
3672  */
3673 static void
3674 iscsi_if_rx(struct sk_buff *skb)
3675 {
3676         u32 portid = NETLINK_CB(skb).portid;
3677
3678         mutex_lock(&rx_queue_mutex);
3679         while (skb->len >= NLMSG_HDRLEN) {
3680                 int err;
3681                 uint32_t rlen;
3682                 struct nlmsghdr *nlh;
3683                 struct iscsi_uevent *ev;
3684                 uint32_t group;
3685
3686                 nlh = nlmsg_hdr(skb);
3687                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3688                     skb->len < nlh->nlmsg_len) {
3689                         break;
3690                 }
3691
3692                 ev = nlmsg_data(nlh);
3693                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3694                 if (rlen > skb->len)
3695                         rlen = skb->len;
3696
3697                 err = iscsi_if_recv_msg(skb, nlh, &group);
3698                 if (err) {
3699                         ev->type = ISCSI_KEVENT_IF_ERROR;
3700                         ev->iferror = err;
3701                 }
3702                 do {
3703                         /*
3704                          * special case for GET_STATS:
3705                          * on success - sending reply and stats from
3706                          * inside of if_recv_msg(),
3707                          * on error - fall through.
3708                          */
3709                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3710                                 break;
3711                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3712                                 break;
3713                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
3714                                                   ev, sizeof(*ev));
3715                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3716                 skb_pull(skb, rlen);
3717         }
3718         mutex_unlock(&rx_queue_mutex);
3719 }
3720
3721 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
3722 struct device_attribute dev_attr_##_prefix##_##_name =  \
3723         __ATTR(_name,_mode,_show,_store)
3724
3725 /*
3726  * iSCSI connection attrs
3727  */
3728 #define iscsi_conn_attr_show(param)                                     \
3729 static ssize_t                                                          \
3730 show_conn_param_##param(struct device *dev,                             \
3731                         struct device_attribute *attr, char *buf)       \
3732 {                                                                       \
3733         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3734         struct iscsi_transport *t = conn->transport;                    \
3735         return t->get_conn_param(conn, param, buf);                     \
3736 }
3737
3738 #define iscsi_conn_attr(field, param)                                   \
3739         iscsi_conn_attr_show(param)                                     \
3740 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
3741                         NULL);
3742
3743 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3744 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3745 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3746 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3747 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3748 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3749 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3750 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3751 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3752 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3753 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3754 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3755 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3756 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3757 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3758 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3759 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3760 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3761 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3762 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3763 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3764 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3765 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3766 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3767 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3768 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3769 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3770 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3771
3772
3773 #define iscsi_conn_ep_attr_show(param)                                  \
3774 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
3775                                           struct device_attribute *attr,\
3776                                           char *buf)                    \
3777 {                                                                       \
3778         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3779         struct iscsi_transport *t = conn->transport;                    \
3780         struct iscsi_endpoint *ep;                                      \
3781         ssize_t rc;                                                     \
3782                                                                         \
3783         /*                                                              \
3784          * Need to make sure ep_disconnect does not free the LLD's      \
3785          * interconnect resources while we are trying to read them.     \
3786          */                                                             \
3787         mutex_lock(&conn->ep_mutex);                                    \
3788         ep = conn->ep;                                                  \
3789         if (!ep && t->ep_connect) {                                     \
3790                 mutex_unlock(&conn->ep_mutex);                          \
3791                 return -ENOTCONN;                                       \
3792         }                                                               \
3793                                                                         \
3794         if (ep)                                                         \
3795                 rc = t->get_ep_param(ep, param, buf);                   \
3796         else                                                            \
3797                 rc = t->get_conn_param(conn, param, buf);               \
3798         mutex_unlock(&conn->ep_mutex);                                  \
3799         return rc;                                                      \
3800 }
3801
3802 #define iscsi_conn_ep_attr(field, param)                                \
3803         iscsi_conn_ep_attr_show(param)                                  \
3804 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
3805                         show_conn_ep_param_##param, NULL);
3806
3807 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
3808 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
3809
3810 static struct attribute *iscsi_conn_attrs[] = {
3811         &dev_attr_conn_max_recv_dlength.attr,
3812         &dev_attr_conn_max_xmit_dlength.attr,
3813         &dev_attr_conn_header_digest.attr,
3814         &dev_attr_conn_data_digest.attr,
3815         &dev_attr_conn_ifmarker.attr,
3816         &dev_attr_conn_ofmarker.attr,
3817         &dev_attr_conn_address.attr,
3818         &dev_attr_conn_port.attr,
3819         &dev_attr_conn_exp_statsn.attr,
3820         &dev_attr_conn_persistent_address.attr,
3821         &dev_attr_conn_persistent_port.attr,
3822         &dev_attr_conn_ping_tmo.attr,
3823         &dev_attr_conn_recv_tmo.attr,
3824         &dev_attr_conn_local_port.attr,
3825         &dev_attr_conn_statsn.attr,
3826         &dev_attr_conn_keepalive_tmo.attr,
3827         &dev_attr_conn_max_segment_size.attr,
3828         &dev_attr_conn_tcp_timestamp_stat.attr,
3829         &dev_attr_conn_tcp_wsf_disable.attr,
3830         &dev_attr_conn_tcp_nagle_disable.attr,
3831         &dev_attr_conn_tcp_timer_scale.attr,
3832         &dev_attr_conn_tcp_timestamp_enable.attr,
3833         &dev_attr_conn_fragment_disable.attr,
3834         &dev_attr_conn_ipv4_tos.attr,
3835         &dev_attr_conn_ipv6_traffic_class.attr,
3836         &dev_attr_conn_ipv6_flow_label.attr,
3837         &dev_attr_conn_is_fw_assigned_ipv6.attr,
3838         &dev_attr_conn_tcp_xmit_wsf.attr,
3839         &dev_attr_conn_tcp_recv_wsf.attr,
3840         &dev_attr_conn_local_ipaddr.attr,
3841         NULL,
3842 };
3843
3844 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
3845                                          struct attribute *attr, int i)
3846 {
3847         struct device *cdev = container_of(kobj, struct device, kobj);
3848         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
3849         struct iscsi_transport *t = conn->transport;
3850         int param;
3851
3852         if (attr == &dev_attr_conn_max_recv_dlength.attr)
3853                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
3854         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
3855                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
3856         else if (attr == &dev_attr_conn_header_digest.attr)
3857                 param = ISCSI_PARAM_HDRDGST_EN;
3858         else if (attr == &dev_attr_conn_data_digest.attr)
3859                 param = ISCSI_PARAM_DATADGST_EN;
3860         else if (attr == &dev_attr_conn_ifmarker.attr)
3861                 param = ISCSI_PARAM_IFMARKER_EN;
3862         else if (attr == &dev_attr_conn_ofmarker.attr)
3863                 param = ISCSI_PARAM_OFMARKER_EN;
3864         else if (attr == &dev_attr_conn_address.attr)
3865                 param = ISCSI_PARAM_CONN_ADDRESS;
3866         else if (attr == &dev_attr_conn_port.attr)
3867                 param = ISCSI_PARAM_CONN_PORT;
3868         else if (attr == &dev_attr_conn_exp_statsn.attr)
3869                 param = ISCSI_PARAM_EXP_STATSN;
3870         else if (attr == &dev_attr_conn_persistent_address.attr)
3871                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
3872         else if (attr == &dev_attr_conn_persistent_port.attr)
3873                 param = ISCSI_PARAM_PERSISTENT_PORT;
3874         else if (attr == &dev_attr_conn_ping_tmo.attr)
3875                 param = ISCSI_PARAM_PING_TMO;
3876         else if (attr == &dev_attr_conn_recv_tmo.attr)
3877                 param = ISCSI_PARAM_RECV_TMO;
3878         else if (attr == &dev_attr_conn_local_port.attr)
3879                 param = ISCSI_PARAM_LOCAL_PORT;
3880         else if (attr == &dev_attr_conn_statsn.attr)
3881                 param = ISCSI_PARAM_STATSN;
3882         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
3883                 param = ISCSI_PARAM_KEEPALIVE_TMO;
3884         else if (attr == &dev_attr_conn_max_segment_size.attr)
3885                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
3886         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
3887                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
3888         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
3889                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
3890         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
3891                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
3892         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
3893                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
3894         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
3895                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
3896         else if (attr == &dev_attr_conn_fragment_disable.attr)
3897                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
3898         else if (attr == &dev_attr_conn_ipv4_tos.attr)
3899                 param = ISCSI_PARAM_IPV4_TOS;
3900         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
3901                 param = ISCSI_PARAM_IPV6_TC;
3902         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
3903                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
3904         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
3905                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
3906         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
3907                 param = ISCSI_PARAM_TCP_XMIT_WSF;
3908         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
3909                 param = ISCSI_PARAM_TCP_RECV_WSF;
3910         else if (attr == &dev_attr_conn_local_ipaddr.attr)
3911                 param = ISCSI_PARAM_LOCAL_IPADDR;
3912         else {
3913                 WARN_ONCE(1, "Invalid conn attr");
3914                 return 0;
3915         }
3916
3917         return t->attr_is_visible(ISCSI_PARAM, param);
3918 }
3919
3920 static struct attribute_group iscsi_conn_group = {
3921         .attrs = iscsi_conn_attrs,
3922         .is_visible = iscsi_conn_attr_is_visible,
3923 };
3924
3925 /*
3926  * iSCSI session attrs
3927  */
3928 #define iscsi_session_attr_show(param, perm)                            \
3929 static ssize_t                                                          \
3930 show_session_param_##param(struct device *dev,                          \
3931                            struct device_attribute *attr, char *buf)    \
3932 {                                                                       \
3933         struct iscsi_cls_session *session =                             \
3934                 iscsi_dev_to_session(dev->parent);                      \
3935         struct iscsi_transport *t = session->transport;                 \
3936                                                                         \
3937         if (perm && !capable(CAP_SYS_ADMIN))                            \
3938                 return -EACCES;                                         \
3939         return t->get_session_param(session, param, buf);               \
3940 }
3941
3942 #define iscsi_session_attr(field, param, perm)                          \
3943         iscsi_session_attr_show(param, perm)                            \
3944 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
3945                         NULL);
3946 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
3947 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
3948 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
3949 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
3950 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
3951 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
3952 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
3953 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
3954 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
3955 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
3956 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
3957 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
3958 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
3959 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
3960 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
3961 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
3962 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
3963 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
3964 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3965 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
3966 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3967 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
3968 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
3969 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
3970 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
3971 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
3972 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
3973 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
3974 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
3975 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
3976 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
3977 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
3978 iscsi_session_attr(discovery_auth_optional,
3979                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
3980 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
3981 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
3982 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
3983 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
3984 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
3985 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
3986 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
3987
3988 static ssize_t
3989 show_priv_session_state(struct device *dev, struct device_attribute *attr,
3990                         char *buf)
3991 {
3992         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
3993         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
3994 }
3995 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
3996                         NULL);
3997 static ssize_t
3998 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
3999                         char *buf)
4000 {
4001         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4002         return sprintf(buf, "%d\n", session->creator);
4003 }
4004 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4005                         NULL);
4006 static ssize_t
4007 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4008                             char *buf)
4009 {
4010         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4011         return sprintf(buf, "%d\n", session->target_id);
4012 }
4013 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4014                         show_priv_session_target_id, NULL);
4015
4016 #define iscsi_priv_session_attr_show(field, format)                     \
4017 static ssize_t                                                          \
4018 show_priv_session_##field(struct device *dev,                           \
4019                           struct device_attribute *attr, char *buf)     \
4020 {                                                                       \
4021         struct iscsi_cls_session *session =                             \
4022                         iscsi_dev_to_session(dev->parent);              \
4023         if (session->field == -1)                                       \
4024                 return sprintf(buf, "off\n");                           \
4025         return sprintf(buf, format"\n", session->field);                \
4026 }
4027
4028 #define iscsi_priv_session_attr_store(field)                            \
4029 static ssize_t                                                          \
4030 store_priv_session_##field(struct device *dev,                          \
4031                            struct device_attribute *attr,               \
4032                            const char *buf, size_t count)               \
4033 {                                                                       \
4034         int val;                                                        \
4035         char *cp;                                                       \
4036         struct iscsi_cls_session *session =                             \
4037                 iscsi_dev_to_session(dev->parent);                      \
4038         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4039             (session->state == ISCSI_SESSION_FAILED))                   \
4040                 return -EBUSY;                                          \
4041         if (strncmp(buf, "off", 3) == 0) {                              \
4042                 session->field = -1;                                    \
4043                 session->field##_sysfs_override = true;                 \
4044         } else {                                                        \
4045                 val = simple_strtoul(buf, &cp, 0);                      \
4046                 if (*cp != '\0' && *cp != '\n')                         \
4047                         return -EINVAL;                                 \
4048                 session->field = val;                                   \
4049                 session->field##_sysfs_override = true;                 \
4050         }                                                               \
4051         return count;                                                   \
4052 }
4053
4054 #define iscsi_priv_session_rw_attr(field, format)                       \
4055         iscsi_priv_session_attr_show(field, format)                     \
4056         iscsi_priv_session_attr_store(field)                            \
4057 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4058                         show_priv_session_##field,                      \
4059                         store_priv_session_##field)
4060
4061 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4062
4063 static struct attribute *iscsi_session_attrs[] = {
4064         &dev_attr_sess_initial_r2t.attr,
4065         &dev_attr_sess_max_outstanding_r2t.attr,
4066         &dev_attr_sess_immediate_data.attr,
4067         &dev_attr_sess_first_burst_len.attr,
4068         &dev_attr_sess_max_burst_len.attr,
4069         &dev_attr_sess_data_pdu_in_order.attr,
4070         &dev_attr_sess_data_seq_in_order.attr,
4071         &dev_attr_sess_erl.attr,
4072         &dev_attr_sess_targetname.attr,
4073         &dev_attr_sess_tpgt.attr,
4074         &dev_attr_sess_password.attr,
4075         &dev_attr_sess_password_in.attr,
4076         &dev_attr_sess_username.attr,
4077         &dev_attr_sess_username_in.attr,
4078         &dev_attr_sess_fast_abort.attr,
4079         &dev_attr_sess_abort_tmo.attr,
4080         &dev_attr_sess_lu_reset_tmo.attr,
4081         &dev_attr_sess_tgt_reset_tmo.attr,
4082         &dev_attr_sess_ifacename.attr,
4083         &dev_attr_sess_initiatorname.attr,
4084         &dev_attr_sess_targetalias.attr,
4085         &dev_attr_sess_boot_root.attr,
4086         &dev_attr_sess_boot_nic.attr,
4087         &dev_attr_sess_boot_target.attr,
4088         &dev_attr_priv_sess_recovery_tmo.attr,
4089         &dev_attr_priv_sess_state.attr,
4090         &dev_attr_priv_sess_creator.attr,
4091         &dev_attr_sess_chap_out_idx.attr,
4092         &dev_attr_sess_chap_in_idx.attr,
4093         &dev_attr_priv_sess_target_id.attr,
4094         &dev_attr_sess_auto_snd_tgt_disable.attr,
4095         &dev_attr_sess_discovery_session.attr,
4096         &dev_attr_sess_portal_type.attr,
4097         &dev_attr_sess_chap_auth.attr,
4098         &dev_attr_sess_discovery_logout.attr,
4099         &dev_attr_sess_bidi_chap.attr,
4100         &dev_attr_sess_discovery_auth_optional.attr,
4101         &dev_attr_sess_def_time2wait.attr,
4102         &dev_attr_sess_def_time2retain.attr,
4103         &dev_attr_sess_isid.attr,
4104         &dev_attr_sess_tsid.attr,
4105         &dev_attr_sess_def_taskmgmt_tmo.attr,
4106         &dev_attr_sess_discovery_parent_idx.attr,
4107         &dev_attr_sess_discovery_parent_type.attr,
4108         NULL,
4109 };
4110
4111 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4112                                             struct attribute *attr, int i)
4113 {
4114         struct device *cdev = container_of(kobj, struct device, kobj);
4115         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4116         struct iscsi_transport *t = session->transport;
4117         int param;
4118
4119         if (attr == &dev_attr_sess_initial_r2t.attr)
4120                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4121         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4122                 param = ISCSI_PARAM_MAX_R2T;
4123         else if (attr == &dev_attr_sess_immediate_data.attr)
4124                 param = ISCSI_PARAM_IMM_DATA_EN;
4125         else if (attr == &dev_attr_sess_first_burst_len.attr)
4126                 param = ISCSI_PARAM_FIRST_BURST;
4127         else if (attr == &dev_attr_sess_max_burst_len.attr)
4128                 param = ISCSI_PARAM_MAX_BURST;
4129         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4130                 param = ISCSI_PARAM_PDU_INORDER_EN;
4131         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4132                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4133         else if (attr == &dev_attr_sess_erl.attr)
4134                 param = ISCSI_PARAM_ERL;
4135         else if (attr == &dev_attr_sess_targetname.attr)
4136                 param = ISCSI_PARAM_TARGET_NAME;
4137         else if (attr == &dev_attr_sess_tpgt.attr)
4138                 param = ISCSI_PARAM_TPGT;
4139         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4140                 param = ISCSI_PARAM_CHAP_IN_IDX;
4141         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4142                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4143         else if (attr == &dev_attr_sess_password.attr)
4144                 param = ISCSI_PARAM_USERNAME;
4145         else if (attr == &dev_attr_sess_password_in.attr)
4146                 param = ISCSI_PARAM_USERNAME_IN;
4147         else if (attr == &dev_attr_sess_username.attr)
4148                 param = ISCSI_PARAM_PASSWORD;
4149         else if (attr == &dev_attr_sess_username_in.attr)
4150                 param = ISCSI_PARAM_PASSWORD_IN;
4151         else if (attr == &dev_attr_sess_fast_abort.attr)
4152                 param = ISCSI_PARAM_FAST_ABORT;
4153         else if (attr == &dev_attr_sess_abort_tmo.attr)
4154                 param = ISCSI_PARAM_ABORT_TMO;
4155         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4156                 param = ISCSI_PARAM_LU_RESET_TMO;
4157         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4158                 param = ISCSI_PARAM_TGT_RESET_TMO;
4159         else if (attr == &dev_attr_sess_ifacename.attr)
4160                 param = ISCSI_PARAM_IFACE_NAME;
4161         else if (attr == &dev_attr_sess_initiatorname.attr)
4162                 param = ISCSI_PARAM_INITIATOR_NAME;
4163         else if (attr == &dev_attr_sess_targetalias.attr)
4164                 param = ISCSI_PARAM_TARGET_ALIAS;
4165         else if (attr == &dev_attr_sess_boot_root.attr)
4166                 param = ISCSI_PARAM_BOOT_ROOT;
4167         else if (attr == &dev_attr_sess_boot_nic.attr)
4168                 param = ISCSI_PARAM_BOOT_NIC;
4169         else if (attr == &dev_attr_sess_boot_target.attr)
4170                 param = ISCSI_PARAM_BOOT_TARGET;
4171         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4172                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4173         else if (attr == &dev_attr_sess_discovery_session.attr)
4174                 param = ISCSI_PARAM_DISCOVERY_SESS;
4175         else if (attr == &dev_attr_sess_portal_type.attr)
4176                 param = ISCSI_PARAM_PORTAL_TYPE;
4177         else if (attr == &dev_attr_sess_chap_auth.attr)
4178                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4179         else if (attr == &dev_attr_sess_discovery_logout.attr)
4180                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4181         else if (attr == &dev_attr_sess_bidi_chap.attr)
4182                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4183         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4184                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4185         else if (attr == &dev_attr_sess_def_time2wait.attr)
4186                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4187         else if (attr == &dev_attr_sess_def_time2retain.attr)
4188                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4189         else if (attr == &dev_attr_sess_isid.attr)
4190                 param = ISCSI_PARAM_ISID;
4191         else if (attr == &dev_attr_sess_tsid.attr)
4192                 param = ISCSI_PARAM_TSID;
4193         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4194                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4195         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4196                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4197         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4198                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4199         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4200                 return S_IRUGO | S_IWUSR;
4201         else if (attr == &dev_attr_priv_sess_state.attr)
4202                 return S_IRUGO;
4203         else if (attr == &dev_attr_priv_sess_creator.attr)
4204                 return S_IRUGO;
4205         else if (attr == &dev_attr_priv_sess_target_id.attr)
4206                 return S_IRUGO;
4207         else {
4208                 WARN_ONCE(1, "Invalid session attr");
4209                 return 0;
4210         }
4211
4212         return t->attr_is_visible(ISCSI_PARAM, param);
4213 }
4214
4215 static struct attribute_group iscsi_session_group = {
4216         .attrs = iscsi_session_attrs,
4217         .is_visible = iscsi_session_attr_is_visible,
4218 };
4219
4220 /*
4221  * iSCSI host attrs
4222  */
4223 #define iscsi_host_attr_show(param)                                     \
4224 static ssize_t                                                          \
4225 show_host_param_##param(struct device *dev,                             \
4226                         struct device_attribute *attr, char *buf)       \
4227 {                                                                       \
4228         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4229         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4230         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4231 }
4232
4233 #define iscsi_host_attr(field, param)                                   \
4234         iscsi_host_attr_show(param)                                     \
4235 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4236                         NULL);
4237
4238 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4239 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4240 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4241 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4242 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4243 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4244
4245 static struct attribute *iscsi_host_attrs[] = {
4246         &dev_attr_host_netdev.attr,
4247         &dev_attr_host_hwaddress.attr,
4248         &dev_attr_host_ipaddress.attr,
4249         &dev_attr_host_initiatorname.attr,
4250         &dev_attr_host_port_state.attr,
4251         &dev_attr_host_port_speed.attr,
4252         NULL,
4253 };
4254
4255 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4256                                          struct attribute *attr, int i)
4257 {
4258         struct device *cdev = container_of(kobj, struct device, kobj);
4259         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4260         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4261         int param;
4262
4263         if (attr == &dev_attr_host_netdev.attr)
4264                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4265         else if (attr == &dev_attr_host_hwaddress.attr)
4266                 param = ISCSI_HOST_PARAM_HWADDRESS;
4267         else if (attr == &dev_attr_host_ipaddress.attr)
4268                 param = ISCSI_HOST_PARAM_IPADDRESS;
4269         else if (attr == &dev_attr_host_initiatorname.attr)
4270                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4271         else if (attr == &dev_attr_host_port_state.attr)
4272                 param = ISCSI_HOST_PARAM_PORT_STATE;
4273         else if (attr == &dev_attr_host_port_speed.attr)
4274                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4275         else {
4276                 WARN_ONCE(1, "Invalid host attr");
4277                 return 0;
4278         }
4279
4280         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4281 }
4282
4283 static struct attribute_group iscsi_host_group = {
4284         .attrs = iscsi_host_attrs,
4285         .is_visible = iscsi_host_attr_is_visible,
4286 };
4287
4288 /* convert iscsi_port_speed values to ascii string name */
4289 static const struct {
4290         enum iscsi_port_speed   value;
4291         char                    *name;
4292 } iscsi_port_speed_names[] = {
4293         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4294         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4295         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4296         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4297         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4298         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4299         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4300 };
4301
4302 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4303 {
4304         int i;
4305         char *speed = "Unknown!";
4306         struct iscsi_cls_host *ihost = shost->shost_data;
4307         uint32_t port_speed = ihost->port_speed;
4308
4309         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4310                 if (iscsi_port_speed_names[i].value & port_speed) {
4311                         speed = iscsi_port_speed_names[i].name;
4312                         break;
4313                 }
4314         }
4315         return speed;
4316 }
4317 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4318
4319 /* convert iscsi_port_state values to ascii string name */
4320 static const struct {
4321         enum iscsi_port_state   value;
4322         char                    *name;
4323 } iscsi_port_state_names[] = {
4324         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4325         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4326 };
4327
4328 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4329 {
4330         int i;
4331         char *state = "Unknown!";
4332         struct iscsi_cls_host *ihost = shost->shost_data;
4333         uint32_t port_state = ihost->port_state;
4334
4335         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4336                 if (iscsi_port_state_names[i].value & port_state) {
4337                         state = iscsi_port_state_names[i].name;
4338                         break;
4339                 }
4340         }
4341         return state;
4342 }
4343 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4344
4345 static int iscsi_session_match(struct attribute_container *cont,
4346                            struct device *dev)
4347 {
4348         struct iscsi_cls_session *session;
4349         struct Scsi_Host *shost;
4350         struct iscsi_internal *priv;
4351
4352         if (!iscsi_is_session_dev(dev))
4353                 return 0;
4354
4355         session = iscsi_dev_to_session(dev);
4356         shost = iscsi_session_to_shost(session);
4357         if (!shost->transportt)
4358                 return 0;
4359
4360         priv = to_iscsi_internal(shost->transportt);
4361         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4362                 return 0;
4363
4364         return &priv->session_cont.ac == cont;
4365 }
4366
4367 static int iscsi_conn_match(struct attribute_container *cont,
4368                            struct device *dev)
4369 {
4370         struct iscsi_cls_session *session;
4371         struct iscsi_cls_conn *conn;
4372         struct Scsi_Host *shost;
4373         struct iscsi_internal *priv;
4374
4375         if (!iscsi_is_conn_dev(dev))
4376                 return 0;
4377
4378         conn = iscsi_dev_to_conn(dev);
4379         session = iscsi_dev_to_session(conn->dev.parent);
4380         shost = iscsi_session_to_shost(session);
4381
4382         if (!shost->transportt)
4383                 return 0;
4384
4385         priv = to_iscsi_internal(shost->transportt);
4386         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4387                 return 0;
4388
4389         return &priv->conn_cont.ac == cont;
4390 }
4391
4392 static int iscsi_host_match(struct attribute_container *cont,
4393                             struct device *dev)
4394 {
4395         struct Scsi_Host *shost;
4396         struct iscsi_internal *priv;
4397
4398         if (!scsi_is_host_device(dev))
4399                 return 0;
4400
4401         shost = dev_to_shost(dev);
4402         if (!shost->transportt  ||
4403             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4404                 return 0;
4405
4406         priv = to_iscsi_internal(shost->transportt);
4407         return &priv->t.host_attrs.ac == cont;
4408 }
4409
4410 struct scsi_transport_template *
4411 iscsi_register_transport(struct iscsi_transport *tt)
4412 {
4413         struct iscsi_internal *priv;
4414         unsigned long flags;
4415         int err;
4416
4417         BUG_ON(!tt);
4418
4419         priv = iscsi_if_transport_lookup(tt);
4420         if (priv)
4421                 return NULL;
4422
4423         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4424         if (!priv)
4425                 return NULL;
4426         INIT_LIST_HEAD(&priv->list);
4427         priv->iscsi_transport = tt;
4428         priv->t.user_scan = iscsi_user_scan;
4429         priv->t.create_work_queue = 1;
4430
4431         priv->dev.class = &iscsi_transport_class;
4432         dev_set_name(&priv->dev, "%s", tt->name);
4433         err = device_register(&priv->dev);
4434         if (err)
4435                 goto free_priv;
4436
4437         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4438         if (err)
4439                 goto unregister_dev;
4440
4441         /* host parameters */
4442         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4443         priv->t.host_attrs.ac.match = iscsi_host_match;
4444         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4445         priv->t.host_size = sizeof(struct iscsi_cls_host);
4446         transport_container_register(&priv->t.host_attrs);
4447
4448         /* connection parameters */
4449         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4450         priv->conn_cont.ac.match = iscsi_conn_match;
4451         priv->conn_cont.ac.grp = &iscsi_conn_group;
4452         transport_container_register(&priv->conn_cont);
4453
4454         /* session parameters */
4455         priv->session_cont.ac.class = &iscsi_session_class.class;
4456         priv->session_cont.ac.match = iscsi_session_match;
4457         priv->session_cont.ac.grp = &iscsi_session_group;
4458         transport_container_register(&priv->session_cont);
4459
4460         spin_lock_irqsave(&iscsi_transport_lock, flags);
4461         list_add(&priv->list, &iscsi_transports);
4462         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4463
4464         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4465         return &priv->t;
4466
4467 unregister_dev:
4468         device_unregister(&priv->dev);
4469         return NULL;
4470 free_priv:
4471         kfree(priv);
4472         return NULL;
4473 }
4474 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4475
4476 int iscsi_unregister_transport(struct iscsi_transport *tt)
4477 {
4478         struct iscsi_internal *priv;
4479         unsigned long flags;
4480
4481         BUG_ON(!tt);
4482
4483         mutex_lock(&rx_queue_mutex);
4484
4485         priv = iscsi_if_transport_lookup(tt);
4486         BUG_ON (!priv);
4487
4488         spin_lock_irqsave(&iscsi_transport_lock, flags);
4489         list_del(&priv->list);
4490         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4491
4492         transport_container_unregister(&priv->conn_cont);
4493         transport_container_unregister(&priv->session_cont);
4494         transport_container_unregister(&priv->t.host_attrs);
4495
4496         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4497         device_unregister(&priv->dev);
4498         mutex_unlock(&rx_queue_mutex);
4499
4500         return 0;
4501 }
4502 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4503
4504 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4505                      struct device *dev, const char *fmt, ...)
4506 {
4507         struct va_format vaf;
4508         va_list args;
4509
4510         va_start(args, fmt);
4511         vaf.fmt = fmt;
4512         vaf.va = &args;
4513         trace(dev, &vaf);
4514         va_end(args);
4515 }
4516 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4517
4518 static __init int iscsi_transport_init(void)
4519 {
4520         int err;
4521         struct netlink_kernel_cfg cfg = {
4522                 .groups = 1,
4523                 .input  = iscsi_if_rx,
4524         };
4525         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4526                 ISCSI_TRANSPORT_VERSION);
4527
4528         atomic_set(&iscsi_session_nr, 0);
4529
4530         err = class_register(&iscsi_transport_class);
4531         if (err)
4532                 return err;
4533
4534         err = class_register(&iscsi_endpoint_class);
4535         if (err)
4536                 goto unregister_transport_class;
4537
4538         err = class_register(&iscsi_iface_class);
4539         if (err)
4540                 goto unregister_endpoint_class;
4541
4542         err = transport_class_register(&iscsi_host_class);
4543         if (err)
4544                 goto unregister_iface_class;
4545
4546         err = transport_class_register(&iscsi_connection_class);
4547         if (err)
4548                 goto unregister_host_class;
4549
4550         err = transport_class_register(&iscsi_session_class);
4551         if (err)
4552                 goto unregister_conn_class;
4553
4554         err = bus_register(&iscsi_flashnode_bus);
4555         if (err)
4556                 goto unregister_session_class;
4557
4558         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4559         if (!nls) {
4560                 err = -ENOBUFS;
4561                 goto unregister_flashnode_bus;
4562         }
4563
4564         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
4565         if (!iscsi_eh_timer_workq) {
4566                 err = -ENOMEM;
4567                 goto release_nls;
4568         }
4569
4570         return 0;
4571
4572 release_nls:
4573         netlink_kernel_release(nls);
4574 unregister_flashnode_bus:
4575         bus_unregister(&iscsi_flashnode_bus);
4576 unregister_session_class:
4577         transport_class_unregister(&iscsi_session_class);
4578 unregister_conn_class:
4579         transport_class_unregister(&iscsi_connection_class);
4580 unregister_host_class:
4581         transport_class_unregister(&iscsi_host_class);
4582 unregister_iface_class:
4583         class_unregister(&iscsi_iface_class);
4584 unregister_endpoint_class:
4585         class_unregister(&iscsi_endpoint_class);
4586 unregister_transport_class:
4587         class_unregister(&iscsi_transport_class);
4588         return err;
4589 }
4590
4591 static void __exit iscsi_transport_exit(void)
4592 {
4593         destroy_workqueue(iscsi_eh_timer_workq);
4594         netlink_kernel_release(nls);
4595         bus_unregister(&iscsi_flashnode_bus);
4596         transport_class_unregister(&iscsi_connection_class);
4597         transport_class_unregister(&iscsi_session_class);
4598         transport_class_unregister(&iscsi_host_class);
4599         class_unregister(&iscsi_endpoint_class);
4600         class_unregister(&iscsi_iface_class);
4601         class_unregister(&iscsi_transport_class);
4602 }
4603
4604 module_init(iscsi_transport_init);
4605 module_exit(iscsi_transport_exit);
4606
4607 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4608               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4609               "Alex Aizman <itn780@yahoo.com>");
4610 MODULE_DESCRIPTION("iSCSI Transport Interface");
4611 MODULE_LICENSE("GPL");
4612 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4613 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);