drivers/scsi/scsi_transport_iscsi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * iSCSI transport class definitions
   4  *
   5  * Copyright (C) IBM Corporation, 2004
   6  * Copyright (C) Mike Christie, 2004 - 2005
   7  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   8  * Copyright (C) Alex Aizman, 2004 - 2005
   9  */
  10 #include <linux/module.h>
  11 #include <linux/mutex.h>
  12 #include <linux/slab.h>
  13 #include <linux/bsg-lib.h>
  14 #include <linux/idr.h>
  15 #include <net/tcp.h>
  16 #include <scsi/scsi.h>
  17 #include <scsi/scsi_host.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_transport.h>
  20 #include <scsi/scsi_transport_iscsi.h>
  21 #include <scsi/iscsi_if.h>
  22 #include <scsi/scsi_cmnd.h>
  23 #include <scsi/scsi_bsg_iscsi.h>
  24
  25 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  26
  27 #define ISCSI_SEND_MAX_ALLOWED  10
  28
  29 #define CREATE_TRACE_POINTS
  30 #include <trace/events/iscsi.h>
  31
  32 /*
  33  * Export tracepoint symbols to be used by other modules.
  34  */
  35 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
  36 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
  37 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
  38 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
  39 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
  40
  41 static int dbg_session;
  42 module_param_named(debug_session, dbg_session, int,
  43                    S_IRUGO | S_IWUSR);
  44 MODULE_PARM_DESC(debug_session,
  45                  "Turn on debugging for sessions in scsi_transport_iscsi "
  46                  "module. Set to 1 to turn on, and zero to turn off. Default "
  47                  "is off.");
  48
  49 static int dbg_conn;
  50 module_param_named(debug_conn, dbg_conn, int,
  51                    S_IRUGO | S_IWUSR);
  52 MODULE_PARM_DESC(debug_conn,
  53                  "Turn on debugging for connections in scsi_transport_iscsi "
  54                  "module. Set to 1 to turn on, and zero to turn off. Default "
  55                  "is off.");
  56
  57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  58         do {                                                            \
  59                 if (dbg_session)                                        \
  60                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  61                                                  "%s: " dbg_fmt,        \
  62                                                  __func__, ##arg);      \
  63                 iscsi_dbg_trace(trace_iscsi_dbg_trans_session,          \
  64                                 &(_session)->dev,                       \
  65                                 "%s " dbg_fmt, __func__, ##arg);        \
  66         } while (0);
  67
  68 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  69         do {                                                            \
  70                 if (dbg_conn)                                           \
  71                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  72                                               "%s: " dbg_fmt,           \
  73                                               __func__, ##arg);         \
  74                 iscsi_dbg_trace(trace_iscsi_dbg_trans_conn,             \
  75                                 &(_conn)->dev,                          \
  76                                 "%s " dbg_fmt, __func__, ##arg);        \
  77         } while (0);
  78
  79 struct iscsi_internal {
  80         struct scsi_transport_template t;
  81         struct iscsi_transport *iscsi_transport;
  82         struct list_head list;
  83         struct device dev;
  84
  85         struct transport_container conn_cont;
  86         struct transport_container session_cont;
  87 };
  88
  89 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  90 static struct workqueue_struct *iscsi_eh_timer_workq;
  91
  92 static struct workqueue_struct *iscsi_conn_cleanup_workq;
  93
  94 static DEFINE_IDA(iscsi_sess_ida);
  95 /*
  96  * list of registered transports and lock that must
  97  * be held while accessing list. The iscsi_transport_lock must
  98  * be acquired after the rx_queue_mutex.
  99  */
 100 static LIST_HEAD(iscsi_transports);
 101 static DEFINE_SPINLOCK(iscsi_transport_lock);
 102
 103 #define to_iscsi_internal(tmpl) \
 104         container_of(tmpl, struct iscsi_internal, t)
 105
 106 #define dev_to_iscsi_internal(_dev) \
 107         container_of(_dev, struct iscsi_internal, dev)
 108
 109 static void iscsi_transport_release(struct device *dev)
 110 {
 111         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 112         kfree(priv);
 113 }
 114
 115 /*
 116  * iscsi_transport_class represents the iscsi_transports that are
 117  * registered.
 118  */
 119 static struct class iscsi_transport_class = {
 120         .name = "iscsi_transport",
 121         .dev_release = iscsi_transport_release,
 122 };
 123
 124 static ssize_t
 125 show_transport_handle(struct device *dev, struct device_attribute *attr,
 126                       char *buf)
 127 {
 128         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 129
 130         if (!capable(CAP_SYS_ADMIN))
 131                 return -EACCES;
 132         return sysfs_emit(buf, "%llu\n",
 133                   (unsigned long long)iscsi_handle(priv->iscsi_transport));
 134 }
 135 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 136
 137 #define show_transport_attr(name, format)                               \
 138 static ssize_t                                                          \
 139 show_transport_##name(struct device *dev,                               \
 140                       struct device_attribute *attr,char *buf)          \
 141 {                                                                       \
 142         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 143         return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
 144 }                                                                       \
 145 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 146
 147 show_transport_attr(caps, "0x%x");
 148
 149 static struct attribute *iscsi_transport_attrs[] = {
 150         &dev_attr_handle.attr,
 151         &dev_attr_caps.attr,
 152         NULL,
 153 };
 154
 155 static struct attribute_group iscsi_transport_group = {
 156         .attrs = iscsi_transport_attrs,
 157 };
 158
 159 /*
 160  * iSCSI endpoint attrs
 161  */
 162 #define iscsi_dev_to_endpoint(_dev) \
 163         container_of(_dev, struct iscsi_endpoint, dev)
 164
 165 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 166 struct device_attribute dev_attr_##_prefix##_##_name =  \
 167         __ATTR(_name,_mode,_show,_store)
 168
 169 static void iscsi_endpoint_release(struct device *dev)
 170 {
 171         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 172         kfree(ep);
 173 }
 174
 175 static struct class iscsi_endpoint_class = {
 176         .name = "iscsi_endpoint",
 177         .dev_release = iscsi_endpoint_release,
 178 };
 179
 180 static ssize_t
 181 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 182 {
 183         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 184         return sysfs_emit(buf, "%llu\n", (unsigned long long) ep->id);
 185 }
 186 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 187
 188 static struct attribute *iscsi_endpoint_attrs[] = {
 189         &dev_attr_ep_handle.attr,
 190         NULL,
 191 };
 192
 193 static struct attribute_group iscsi_endpoint_group = {
 194         .attrs = iscsi_endpoint_attrs,
 195 };
 196
 197 #define ISCSI_MAX_EPID -1
 198
 199 static int iscsi_match_epid(struct device *dev, const void *data)
 200 {
 201         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 202         const uint64_t *epid = data;
 203
 204         return *epid == ep->id;
 205 }
 206
 207 struct iscsi_endpoint *
 208 iscsi_create_endpoint(int dd_size)
 209 {
 210         struct device *dev;
 211         struct iscsi_endpoint *ep;
 212         uint64_t id;
 213         int err;
 214
 215         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 216                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 217                                         iscsi_match_epid);
 218                 if (!dev)
 219                         break;
 220                 else
 221                         put_device(dev);
 222         }
 223         if (id == ISCSI_MAX_EPID) {
 224                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 225                        ISCSI_MAX_EPID - 1);
 226                 return NULL;
 227         }
 228
 229         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 230         if (!ep)
 231                 return NULL;
 232
 233         ep->id = id;
 234         ep->dev.class = &iscsi_endpoint_class;
 235         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 236         err = device_register(&ep->dev);
 237         if (err)
 238                 goto free_ep;
 239
 240         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 241         if (err)
 242                 goto unregister_dev;
 243
 244         if (dd_size)
 245                 ep->dd_data = &ep[1];
 246         return ep;
 247
 248 unregister_dev:
 249         device_unregister(&ep->dev);
 250         return NULL;
 251
 252 free_ep:
 253         kfree(ep);
 254         return NULL;
 255 }
 256 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 257
 258 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 259 {
 260         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 261         device_unregister(&ep->dev);
 262 }
 263 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 264
 265 void iscsi_put_endpoint(struct iscsi_endpoint *ep)
 266 {
 267         put_device(&ep->dev);
 268 }
 269 EXPORT_SYMBOL_GPL(iscsi_put_endpoint);
 270
 271 /**
 272  * iscsi_lookup_endpoint - get ep from handle
 273  * @handle: endpoint handle
 274  *
 275  * Caller must do a iscsi_put_endpoint.
 276  */
 277 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 278 {
 279         struct device *dev;
 280
 281         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 282                                 iscsi_match_epid);
 283         if (!dev)
 284                 return NULL;
 285
 286         return iscsi_dev_to_endpoint(dev);
 287 }
 288 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 289
 290 /*
 291  * Interface to display network param to sysfs
 292  */
 293
 294 static void iscsi_iface_release(struct device *dev)
 295 {
 296         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 297         struct device *parent = iface->dev.parent;
 298
 299         kfree(iface);
 300         put_device(parent);
 301 }
 302
 303
 304 static struct class iscsi_iface_class = {
 305         .name = "iscsi_iface",
 306         .dev_release = iscsi_iface_release,
 307 };
 308
 309 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 310 struct device_attribute dev_attr_##_prefix##_##_name =          \
 311         __ATTR(_name, _mode, _show, _store)
 312
 313 /* iface attrs show */
 314 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 315 static ssize_t                                                          \
 316 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 317                      char *buf)                                         \
 318 {                                                                       \
 319         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 320         struct iscsi_transport *t = iface->transport;                   \
 321         return t->get_iface_param(iface, param_type, param, buf);       \
 322 }                                                                       \
 323
 324 #define iscsi_iface_net_attr(type, name, param)                         \
 325         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 326 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 327
 328 #define iscsi_iface_attr(type, name, param)                             \
 329         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 330 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 331
 332 /* generic read only ipv4 attribute */
 333 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 334 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 335 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 336 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 337 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 338                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 339 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 340                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 341 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 342 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 343 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 344                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 345 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 346                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 347 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 348                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 349 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 350                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 351 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 352                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 353 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 354                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 355 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 356                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 357 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 358                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 359 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 360                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 361 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 362
 363 /* generic read only ipv6 attribute */
 364 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 365 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 366                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 367 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 368 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 369                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 370 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 371                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 372 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 373                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 374 iscsi_iface_net_attr(ipv6_iface, router_state,
 375                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 376 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 377                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 378 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 379 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 380 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 381                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 382 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 383 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 384                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 385 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 386                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 387 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 388                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 389 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 390                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 391 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 392                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 393
 394 /* common read only iface attribute */
 395 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 396 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 397 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 398 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 399 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 400 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 401 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 402 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 403 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 404                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 405 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 406 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 407 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 408 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 409 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 410 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 411
 412 /* common iscsi specific settings attributes */
 413 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 414 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 415 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 416 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 417 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 418 iscsi_iface_attr(iface, data_seq_in_order,
 419                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 420 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 421 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 422 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 423 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 424 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 425 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 426 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 427 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 428 iscsi_iface_attr(iface, discovery_auth_optional,
 429                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 430 iscsi_iface_attr(iface, discovery_logout,
 431                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 432 iscsi_iface_attr(iface, strict_login_comp_en,
 433                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 434 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 435
 436 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 437                                           struct attribute *attr, int i)
 438 {
 439         struct device *dev = container_of(kobj, struct device, kobj);
 440         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 441         struct iscsi_transport *t = iface->transport;
 442         int param = -1;
 443
 444         if (attr == &dev_attr_iface_enabled.attr)
 445                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 446         else if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 447                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 448         else if (attr == &dev_attr_iface_header_digest.attr)
 449                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 450         else if (attr == &dev_attr_iface_data_digest.attr)
 451                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 452         else if (attr == &dev_attr_iface_immediate_data.attr)
 453                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 454         else if (attr == &dev_attr_iface_initial_r2t.attr)
 455                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 456         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 457                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 458         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 459                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 460         else if (attr == &dev_attr_iface_erl.attr)
 461                 param = ISCSI_IFACE_PARAM_ERL;
 462         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 463                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 464         else if (attr == &dev_attr_iface_first_burst_len.attr)
 465                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 466         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 467                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 468         else if (attr == &dev_attr_iface_max_burst_len.attr)
 469                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 470         else if (attr == &dev_attr_iface_chap_auth.attr)
 471                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 472         else if (attr == &dev_attr_iface_bidi_chap.attr)
 473                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 474         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 475                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 476         else if (attr == &dev_attr_iface_discovery_logout.attr)
 477                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 478         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 479                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 480         else if (attr == &dev_attr_iface_initiator_name.attr)
 481                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 482
 483         if (param != -1)
 484                 return t->attr_is_visible(ISCSI_IFACE_PARAM, param);
 485
 486         if (attr == &dev_attr_iface_vlan_id.attr)
 487                 param = ISCSI_NET_PARAM_VLAN_ID;
 488         else if (attr == &dev_attr_iface_vlan_priority.attr)
 489                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 490         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 491                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 492         else if (attr == &dev_attr_iface_mtu.attr)
 493                 param = ISCSI_NET_PARAM_MTU;
 494         else if (attr == &dev_attr_iface_port.attr)
 495                 param = ISCSI_NET_PARAM_PORT;
 496         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 497                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 498         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 499                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 500         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 501                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 502         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 503                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 504         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 505                 param = ISCSI_NET_PARAM_TCP_WSF;
 506         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 507                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 508         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 509                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 510         else if (attr == &dev_attr_iface_cache_id.attr)
 511                 param = ISCSI_NET_PARAM_CACHE_ID;
 512         else if (attr == &dev_attr_iface_redirect_en.attr)
 513                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 514         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 515                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 516                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 517                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 518                         param = ISCSI_NET_PARAM_IPV4_GW;
 519                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 520                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 521                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 522                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 523                 else if (attr ==
 524                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 525                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 526                 else if (attr ==
 527                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 528                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 529                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 530                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 531                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 532                         param = ISCSI_NET_PARAM_IPV4_TOS;
 533                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 534                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 535                 else if (attr ==
 536                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 537                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 538                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 539                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 540                 else if (attr ==
 541                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 542                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 543                 else if (attr ==
 544                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 545                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 546                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 547                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 548                 else if (attr ==
 549                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 550                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 551                 else if (attr ==
 552                          &dev_attr_ipv4_iface_fragment_disable.attr)
 553                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 554                 else if (attr ==
 555                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 556                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 557                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 558                         param = ISCSI_NET_PARAM_IPV4_TTL;
 559                 else
 560                         return 0;
 561         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 562                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 563                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 564                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 565                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 566                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 567                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 568                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 569                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 570                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 571                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 572                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 573                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 574                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 575                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 576                 else if (attr ==
 577                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 578                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 579                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 580                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 581                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 582                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 583                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 584                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 585                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 586                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 587                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 588                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 589                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 590                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 591                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 592                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 593                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 594                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 595                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 596                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 597                 else
 598                         return 0;
 599         } else {
 600                 WARN_ONCE(1, "Invalid iface attr");
 601                 return 0;
 602         }
 603
 604         return t->attr_is_visible(ISCSI_NET_PARAM, param);
 605 }
 606
 607 static struct attribute *iscsi_iface_attrs[] = {
 608         &dev_attr_iface_enabled.attr,
 609         &dev_attr_iface_vlan_id.attr,
 610         &dev_attr_iface_vlan_priority.attr,
 611         &dev_attr_iface_vlan_enabled.attr,
 612         &dev_attr_ipv4_iface_ipaddress.attr,
 613         &dev_attr_ipv4_iface_gateway.attr,
 614         &dev_attr_ipv4_iface_subnet.attr,
 615         &dev_attr_ipv4_iface_bootproto.attr,
 616         &dev_attr_ipv6_iface_ipaddress.attr,
 617         &dev_attr_ipv6_iface_link_local_addr.attr,
 618         &dev_attr_ipv6_iface_router_addr.attr,
 619         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 620         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 621         &dev_attr_iface_mtu.attr,
 622         &dev_attr_iface_port.attr,
 623         &dev_attr_iface_ipaddress_state.attr,
 624         &dev_attr_iface_delayed_ack_en.attr,
 625         &dev_attr_iface_tcp_nagle_disable.attr,
 626         &dev_attr_iface_tcp_wsf_disable.attr,
 627         &dev_attr_iface_tcp_wsf.attr,
 628         &dev_attr_iface_tcp_timer_scale.attr,
 629         &dev_attr_iface_tcp_timestamp_en.attr,
 630         &dev_attr_iface_cache_id.attr,
 631         &dev_attr_iface_redirect_en.attr,
 632         &dev_attr_iface_def_taskmgmt_tmo.attr,
 633         &dev_attr_iface_header_digest.attr,
 634         &dev_attr_iface_data_digest.attr,
 635         &dev_attr_iface_immediate_data.attr,
 636         &dev_attr_iface_initial_r2t.attr,
 637         &dev_attr_iface_data_seq_in_order.attr,
 638         &dev_attr_iface_data_pdu_in_order.attr,
 639         &dev_attr_iface_erl.attr,
 640         &dev_attr_iface_max_recv_dlength.attr,
 641         &dev_attr_iface_first_burst_len.attr,
 642         &dev_attr_iface_max_outstanding_r2t.attr,
 643         &dev_attr_iface_max_burst_len.attr,
 644         &dev_attr_iface_chap_auth.attr,
 645         &dev_attr_iface_bidi_chap.attr,
 646         &dev_attr_iface_discovery_auth_optional.attr,
 647         &dev_attr_iface_discovery_logout.attr,
 648         &dev_attr_iface_strict_login_comp_en.attr,
 649         &dev_attr_iface_initiator_name.attr,
 650         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 651         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 652         &dev_attr_ipv4_iface_tos_en.attr,
 653         &dev_attr_ipv4_iface_tos.attr,
 654         &dev_attr_ipv4_iface_grat_arp_en.attr,
 655         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 656         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 657         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 658         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 659         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 660         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 661         &dev_attr_ipv4_iface_fragment_disable.attr,
 662         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 663         &dev_attr_ipv4_iface_ttl.attr,
 664         &dev_attr_ipv6_iface_link_local_state.attr,
 665         &dev_attr_ipv6_iface_router_state.attr,
 666         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 667         &dev_attr_ipv6_iface_mld_en.attr,
 668         &dev_attr_ipv6_iface_flow_label.attr,
 669         &dev_attr_ipv6_iface_traffic_class.attr,
 670         &dev_attr_ipv6_iface_hop_limit.attr,
 671         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 672         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 673         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 674         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 675         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 676         NULL,
 677 };
 678
 679 static struct attribute_group iscsi_iface_group = {
 680         .attrs = iscsi_iface_attrs,
 681         .is_visible = iscsi_iface_attr_is_visible,
 682 };
 683
 684 /* convert iscsi_ipaddress_state values to ascii string name */
 685 static const struct {
 686         enum iscsi_ipaddress_state      value;
 687         char                            *name;
 688 } iscsi_ipaddress_state_names[] = {
 689         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 690         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 691         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 692         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 693         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 694         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 695         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 696 };
 697
 698 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 699 {
 700         int i;
 701         char *state = NULL;
 702
 703         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 704                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 705                         state = iscsi_ipaddress_state_names[i].name;
 706                         break;
 707                 }
 708         }
 709         return state;
 710 }
 711 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 712
 713 /* convert iscsi_router_state values to ascii string name */
 714 static const struct {
 715         enum iscsi_router_state value;
 716         char                    *name;
 717 } iscsi_router_state_names[] = {
 718         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 719         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 720         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 721         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 722 };
 723
 724 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 725 {
 726         int i;
 727         char *state = NULL;
 728
 729         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 730                 if (iscsi_router_state_names[i].value == router_state) {
 731                         state = iscsi_router_state_names[i].name;
 732                         break;
 733                 }
 734         }
 735         return state;
 736 }
 737 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 738
 739 struct iscsi_iface *
 740 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 741                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 742 {
 743         struct iscsi_iface *iface;
 744         int err;
 745
 746         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 747         if (!iface)
 748                 return NULL;
 749
 750         iface->transport = transport;
 751         iface->iface_type = iface_type;
 752         iface->iface_num = iface_num;
 753         iface->dev.release = iscsi_iface_release;
 754         iface->dev.class = &iscsi_iface_class;
 755         /* parent reference released in iscsi_iface_release */
 756         iface->dev.parent = get_device(&shost->shost_gendev);
 757         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 758                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 759                              iface_num);
 760         else
 761                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 762                              iface_num);
 763
 764         err = device_register(&iface->dev);
 765         if (err)
 766                 goto free_iface;
 767
 768         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 769         if (err)
 770                 goto unreg_iface;
 771
 772         if (dd_size)
 773                 iface->dd_data = &iface[1];
 774         return iface;
 775
 776 unreg_iface:
 777         device_unregister(&iface->dev);
 778         return NULL;
 779
 780 free_iface:
 781         put_device(iface->dev.parent);
 782         kfree(iface);
 783         return NULL;
 784 }
 785 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 786
 787 void iscsi_destroy_iface(struct iscsi_iface *iface)
 788 {
 789         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 790         device_unregister(&iface->dev);
 791 }
 792 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 793
 794 /*
 795  * Interface to display flash node params to sysfs
 796  */
 797
 798 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 799 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 800         __ATTR(_name, _mode, _show, _store)
 801
 802 /* flash node session attrs show */
 803 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 804 static ssize_t                                                          \
 805 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 806                      char *buf)                                         \
 807 {                                                                       \
 808         struct iscsi_bus_flash_session *fnode_sess =                    \
 809                                         iscsi_dev_to_flash_session(dev);\
 810         struct iscsi_transport *t = fnode_sess->transport;              \
 811         return t->get_flashnode_param(fnode_sess, param, buf);          \
 812 }                                                                       \
 813
 814
 815 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 816         iscsi_flashnode_sess_attr_show(type, name, param)               \
 817 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 818                             show_##type##_##name, NULL);
 819
 820 /* Flash node session attributes */
 821
 822 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 823                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 824 iscsi_flashnode_sess_attr(fnode, discovery_session,
 825                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 826 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 827 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 828 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 829 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 830 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 831                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 832 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 833                           ISCSI_FLASHNODE_PDU_INORDER);
 834 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 835 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 836                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 837 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 838 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 839                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 840 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 841 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 842 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 843 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 844                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 845 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 846 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 847 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 848 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 849 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 850                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 851 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 852 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 853 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 854 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 855                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 856 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 857                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 858 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 859 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 860 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 861 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 862 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 863 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 864 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 865
 866 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 867         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 868         &dev_attr_fnode_discovery_session.attr,
 869         &dev_attr_fnode_portal_type.attr,
 870         &dev_attr_fnode_entry_enable.attr,
 871         &dev_attr_fnode_immediate_data.attr,
 872         &dev_attr_fnode_initial_r2t.attr,
 873         &dev_attr_fnode_data_seq_in_order.attr,
 874         &dev_attr_fnode_data_pdu_in_order.attr,
 875         &dev_attr_fnode_chap_auth.attr,
 876         &dev_attr_fnode_discovery_logout.attr,
 877         &dev_attr_fnode_bidi_chap.attr,
 878         &dev_attr_fnode_discovery_auth_optional.attr,
 879         &dev_attr_fnode_erl.attr,
 880         &dev_attr_fnode_first_burst_len.attr,
 881         &dev_attr_fnode_def_time2wait.attr,
 882         &dev_attr_fnode_def_time2retain.attr,
 883         &dev_attr_fnode_max_outstanding_r2t.attr,
 884         &dev_attr_fnode_isid.attr,
 885         &dev_attr_fnode_tsid.attr,
 886         &dev_attr_fnode_max_burst_len.attr,
 887         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 888         &dev_attr_fnode_targetalias.attr,
 889         &dev_attr_fnode_targetname.attr,
 890         &dev_attr_fnode_tpgt.attr,
 891         &dev_attr_fnode_discovery_parent_idx.attr,
 892         &dev_attr_fnode_discovery_parent_type.attr,
 893         &dev_attr_fnode_chap_in_idx.attr,
 894         &dev_attr_fnode_chap_out_idx.attr,
 895         &dev_attr_fnode_username.attr,
 896         &dev_attr_fnode_username_in.attr,
 897         &dev_attr_fnode_password.attr,
 898         &dev_attr_fnode_password_in.attr,
 899         &dev_attr_fnode_is_boot_target.attr,
 900         NULL,
 901 };
 902
 903 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 904                                                     struct attribute *attr,
 905                                                     int i)
 906 {
 907         struct device *dev = container_of(kobj, struct device, kobj);
 908         struct iscsi_bus_flash_session *fnode_sess =
 909                                                 iscsi_dev_to_flash_session(dev);
 910         struct iscsi_transport *t = fnode_sess->transport;
 911         int param;
 912
 913         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 914                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 915         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 916                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 917         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 918                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 919         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 920                 param = ISCSI_FLASHNODE_ENTRY_EN;
 921         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 922                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 923         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 924                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 925         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 926                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 927         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 928                 param = ISCSI_FLASHNODE_PDU_INORDER;
 929         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 930                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 931         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 932                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 933         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 934                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 935         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 936                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 937         } else if (attr == &dev_attr_fnode_erl.attr) {
 938                 param = ISCSI_FLASHNODE_ERL;
 939         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 940                 param = ISCSI_FLASHNODE_FIRST_BURST;
 941         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 942                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 943         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 944                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 945         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 946                 param = ISCSI_FLASHNODE_MAX_R2T;
 947         } else if (attr == &dev_attr_fnode_isid.attr) {
 948                 param = ISCSI_FLASHNODE_ISID;
 949         } else if (attr == &dev_attr_fnode_tsid.attr) {
 950                 param = ISCSI_FLASHNODE_TSID;
 951         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 952                 param = ISCSI_FLASHNODE_MAX_BURST;
 953         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 954                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 955         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 956                 param = ISCSI_FLASHNODE_ALIAS;
 957         } else if (attr == &dev_attr_fnode_targetname.attr) {
 958                 param = ISCSI_FLASHNODE_NAME;
 959         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 960                 param = ISCSI_FLASHNODE_TPGT;
 961         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 962                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 963         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 964                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 965         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 966                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 967         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 968                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 969         } else if (attr == &dev_attr_fnode_username.attr) {
 970                 param = ISCSI_FLASHNODE_USERNAME;
 971         } else if (attr == &dev_attr_fnode_username_in.attr) {
 972                 param = ISCSI_FLASHNODE_USERNAME_IN;
 973         } else if (attr == &dev_attr_fnode_password.attr) {
 974                 param = ISCSI_FLASHNODE_PASSWORD;
 975         } else if (attr == &dev_attr_fnode_password_in.attr) {
 976                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 977         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 978                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 979         } else {
 980                 WARN_ONCE(1, "Invalid flashnode session attr");
 981                 return 0;
 982         }
 983
 984         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 985 }
 986
 987 static struct attribute_group iscsi_flashnode_sess_attr_group = {
 988         .attrs = iscsi_flashnode_sess_attrs,
 989         .is_visible = iscsi_flashnode_sess_attr_is_visible,
 990 };
 991
 992 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
 993         &iscsi_flashnode_sess_attr_group,
 994         NULL,
 995 };
 996
 997 static void iscsi_flashnode_sess_release(struct device *dev)
 998 {
 999         struct iscsi_bus_flash_session *fnode_sess =
1000                                                 iscsi_dev_to_flash_session(dev);
1001
1002         kfree(fnode_sess->targetname);
1003         kfree(fnode_sess->targetalias);
1004         kfree(fnode_sess->portal_type);
1005         kfree(fnode_sess);
1006 }
1007
1008 static const struct device_type iscsi_flashnode_sess_dev_type = {
1009         .name = "iscsi_flashnode_sess_dev_type",
1010         .groups = iscsi_flashnode_sess_attr_groups,
1011         .release = iscsi_flashnode_sess_release,
1012 };
1013
1014 /* flash node connection attrs show */
1015 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1016 static ssize_t                                                          \
1017 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1018                      char *buf)                                         \
1019 {                                                                       \
1020         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1021         struct iscsi_bus_flash_session *fnode_sess =                    \
1022                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1023         struct iscsi_transport *t = fnode_conn->transport;              \
1024         return t->get_flashnode_param(fnode_sess, param, buf);          \
1025 }                                                                       \
1026
1027
1028 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1029         iscsi_flashnode_conn_attr_show(type, name, param)               \
1030 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1031                             show_##type##_##name, NULL);
1032
1033 /* Flash node connection attributes */
1034
1035 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1036                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1037 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1038 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1039 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1040 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1041                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1042 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1043                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1044 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1045                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1046 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1047                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1048 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1049                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1050 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1051                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1052 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1053 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1054 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1055 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1056                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1057 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1058                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1059 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1060 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1061 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1062 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1063                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1064 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1065                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1066 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1067                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1068 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1069                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1070 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1071 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1072 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1073 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1074
1075 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1076         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1077         &dev_attr_fnode_header_digest.attr,
1078         &dev_attr_fnode_data_digest.attr,
1079         &dev_attr_fnode_snack_req.attr,
1080         &dev_attr_fnode_tcp_timestamp_stat.attr,
1081         &dev_attr_fnode_tcp_nagle_disable.attr,
1082         &dev_attr_fnode_tcp_wsf_disable.attr,
1083         &dev_attr_fnode_tcp_timer_scale.attr,
1084         &dev_attr_fnode_tcp_timestamp_enable.attr,
1085         &dev_attr_fnode_fragment_disable.attr,
1086         &dev_attr_fnode_max_recv_dlength.attr,
1087         &dev_attr_fnode_max_xmit_dlength.attr,
1088         &dev_attr_fnode_keepalive_tmo.attr,
1089         &dev_attr_fnode_port.attr,
1090         &dev_attr_fnode_ipaddress.attr,
1091         &dev_attr_fnode_redirect_ipaddr.attr,
1092         &dev_attr_fnode_max_segment_size.attr,
1093         &dev_attr_fnode_local_port.attr,
1094         &dev_attr_fnode_ipv4_tos.attr,
1095         &dev_attr_fnode_ipv6_traffic_class.attr,
1096         &dev_attr_fnode_ipv6_flow_label.attr,
1097         &dev_attr_fnode_link_local_ipv6.attr,
1098         &dev_attr_fnode_tcp_xmit_wsf.attr,
1099         &dev_attr_fnode_tcp_recv_wsf.attr,
1100         &dev_attr_fnode_statsn.attr,
1101         &dev_attr_fnode_exp_statsn.attr,
1102         NULL,
1103 };
1104
1105 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1106                                                     struct attribute *attr,
1107                                                     int i)
1108 {
1109         struct device *dev = container_of(kobj, struct device, kobj);
1110         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1111         struct iscsi_transport *t = fnode_conn->transport;
1112         int param;
1113
1114         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1115                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1116         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1117                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1118         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1119                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1120         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1121                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1122         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1123                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1124         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1125                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1126         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1127                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1128         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1129                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1130         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1131                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1132         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1133                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1134         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1135                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1136         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1137                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1138         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1139                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1140         } else if (attr == &dev_attr_fnode_port.attr) {
1141                 param = ISCSI_FLASHNODE_PORT;
1142         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1143                 param = ISCSI_FLASHNODE_IPADDR;
1144         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1145                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1146         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1147                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1148         } else if (attr == &dev_attr_fnode_local_port.attr) {
1149                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1150         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1151                 param = ISCSI_FLASHNODE_IPV4_TOS;
1152         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1153                 param = ISCSI_FLASHNODE_IPV6_TC;
1154         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1155                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1156         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1157                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1158         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1159                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1160         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1161                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1162         } else if (attr == &dev_attr_fnode_statsn.attr) {
1163                 param = ISCSI_FLASHNODE_STATSN;
1164         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1165                 param = ISCSI_FLASHNODE_EXP_STATSN;
1166         } else {
1167                 WARN_ONCE(1, "Invalid flashnode connection attr");
1168                 return 0;
1169         }
1170
1171         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1172 }
1173
1174 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1175         .attrs = iscsi_flashnode_conn_attrs,
1176         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1177 };
1178
1179 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1180         &iscsi_flashnode_conn_attr_group,
1181         NULL,
1182 };
1183
1184 static void iscsi_flashnode_conn_release(struct device *dev)
1185 {
1186         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1187
1188         kfree(fnode_conn->ipaddress);
1189         kfree(fnode_conn->redirect_ipaddr);
1190         kfree(fnode_conn->link_local_ipv6_addr);
1191         kfree(fnode_conn);
1192 }
1193
1194 static const struct device_type iscsi_flashnode_conn_dev_type = {
1195         .name = "iscsi_flashnode_conn_dev_type",
1196         .groups = iscsi_flashnode_conn_attr_groups,
1197         .release = iscsi_flashnode_conn_release,
1198 };
1199
1200 static struct bus_type iscsi_flashnode_bus;
1201
1202 int iscsi_flashnode_bus_match(struct device *dev,
1203                                      struct device_driver *drv)
1204 {
1205         if (dev->bus == &iscsi_flashnode_bus)
1206                 return 1;
1207         return 0;
1208 }
1209 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1210
1211 static struct bus_type iscsi_flashnode_bus = {
1212         .name = "iscsi_flashnode",
1213         .match = &iscsi_flashnode_bus_match,
1214 };
1215
1216 /**
1217  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1218  * @shost: pointer to host data
1219  * @index: index of flashnode to add in sysfs
1220  * @transport: pointer to transport data
1221  * @dd_size: total size to allocate
1222  *
1223  * Adds a sysfs entry for the flashnode session attributes
1224  *
1225  * Returns:
1226  *  pointer to allocated flashnode sess on success
1227  *  %NULL on failure
1228  */
1229 struct iscsi_bus_flash_session *
1230 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1231                             struct iscsi_transport *transport,
1232                             int dd_size)
1233 {
1234         struct iscsi_bus_flash_session *fnode_sess;
1235         int err;
1236
1237         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1238         if (!fnode_sess)
1239                 return NULL;
1240
1241         fnode_sess->transport = transport;
1242         fnode_sess->target_id = index;
1243         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1244         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1245         fnode_sess->dev.parent = &shost->shost_gendev;
1246         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1247                      shost->host_no, index);
1248
1249         err = device_register(&fnode_sess->dev);
1250         if (err)
1251                 goto free_fnode_sess;
1252
1253         if (dd_size)
1254                 fnode_sess->dd_data = &fnode_sess[1];
1255
1256         return fnode_sess;
1257
1258 free_fnode_sess:
1259         kfree(fnode_sess);
1260         return NULL;
1261 }
1262 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1263
1264 /**
1265  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1266  * @shost: pointer to host data
1267  * @fnode_sess: pointer to the parent flashnode session entry
1268  * @transport: pointer to transport data
1269  * @dd_size: total size to allocate
1270  *
1271  * Adds a sysfs entry for the flashnode connection attributes
1272  *
1273  * Returns:
1274  *  pointer to allocated flashnode conn on success
1275  *  %NULL on failure
1276  */
1277 struct iscsi_bus_flash_conn *
1278 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1279                             struct iscsi_bus_flash_session *fnode_sess,
1280                             struct iscsi_transport *transport,
1281                             int dd_size)
1282 {
1283         struct iscsi_bus_flash_conn *fnode_conn;
1284         int err;
1285
1286         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1287         if (!fnode_conn)
1288                 return NULL;
1289
1290         fnode_conn->transport = transport;
1291         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1292         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1293         fnode_conn->dev.parent = &fnode_sess->dev;
1294         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1295                      shost->host_no, fnode_sess->target_id);
1296
1297         err = device_register(&fnode_conn->dev);
1298         if (err)
1299                 goto free_fnode_conn;
1300
1301         if (dd_size)
1302                 fnode_conn->dd_data = &fnode_conn[1];
1303
1304         return fnode_conn;
1305
1306 free_fnode_conn:
1307         kfree(fnode_conn);
1308         return NULL;
1309 }
1310 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1311
1312 /**
1313  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1314  * @dev: device to verify
1315  * @data: pointer to data containing value to use for verification
1316  *
1317  * Verifies if the passed device is flashnode conn device
1318  *
1319  * Returns:
1320  *  1 on success
1321  *  0 on failure
1322  */
1323 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1324 {
1325         return dev->bus == &iscsi_flashnode_bus;
1326 }
1327
1328 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1329 {
1330         device_unregister(&fnode_conn->dev);
1331         return 0;
1332 }
1333
1334 static int flashnode_match_index(struct device *dev, void *data)
1335 {
1336         struct iscsi_bus_flash_session *fnode_sess = NULL;
1337         int ret = 0;
1338
1339         if (!iscsi_flashnode_bus_match(dev, NULL))
1340                 goto exit_match_index;
1341
1342         fnode_sess = iscsi_dev_to_flash_session(dev);
1343         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1344
1345 exit_match_index:
1346         return ret;
1347 }
1348
1349 /**
1350  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1351  * @shost: pointer to host data
1352  * @idx: index to match
1353  *
1354  * Finds the flashnode session object for the passed index
1355  *
1356  * Returns:
1357  *  pointer to found flashnode session object on success
1358  *  %NULL on failure
1359  */
1360 static struct iscsi_bus_flash_session *
1361 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1362 {
1363         struct iscsi_bus_flash_session *fnode_sess = NULL;
1364         struct device *dev;
1365
1366         dev = device_find_child(&shost->shost_gendev, &idx,
1367                                 flashnode_match_index);
1368         if (dev)
1369                 fnode_sess = iscsi_dev_to_flash_session(dev);
1370
1371         return fnode_sess;
1372 }
1373
1374 /**
1375  * iscsi_find_flashnode_sess - finds flashnode session entry
1376  * @shost: pointer to host data
1377  * @data: pointer to data containing value to use for comparison
1378  * @fn: function pointer that does actual comparison
1379  *
1380  * Finds the flashnode session object comparing the data passed using logic
1381  * defined in passed function pointer
1382  *
1383  * Returns:
1384  *  pointer to found flashnode session device object on success
1385  *  %NULL on failure
1386  */
1387 struct device *
1388 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1389                           int (*fn)(struct device *dev, void *data))
1390 {
1391         return device_find_child(&shost->shost_gendev, data, fn);
1392 }
1393 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1394
1395 /**
1396  * iscsi_find_flashnode_conn - finds flashnode connection entry
1397  * @fnode_sess: pointer to parent flashnode session entry
1398  *
1399  * Finds the flashnode connection object comparing the data passed using logic
1400  * defined in passed function pointer
1401  *
1402  * Returns:
1403  *  pointer to found flashnode connection device object on success
1404  *  %NULL on failure
1405  */
1406 struct device *
1407 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1408 {
1409         return device_find_child(&fnode_sess->dev, NULL,
1410                                  iscsi_is_flashnode_conn_dev);
1411 }
1412 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1413
1414 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1415 {
1416         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1417                 return 0;
1418
1419         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1420 }
1421
1422 /**
1423  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1424  * @fnode_sess: pointer to flashnode session entry to be destroyed
1425  *
1426  * Deletes the flashnode session entry and all children flashnode connection
1427  * entries from sysfs
1428  */
1429 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1430 {
1431         int err;
1432
1433         err = device_for_each_child(&fnode_sess->dev, NULL,
1434                                     iscsi_iter_destroy_flashnode_conn_fn);
1435         if (err)
1436                 pr_err("Could not delete all connections for %s. Error %d.\n",
1437                        fnode_sess->dev.kobj.name, err);
1438
1439         device_unregister(&fnode_sess->dev);
1440 }
1441 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1442
1443 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1444 {
1445         if (!iscsi_flashnode_bus_match(dev, NULL))
1446                 return 0;
1447
1448         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1449         return 0;
1450 }
1451
1452 /**
1453  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1454  * @shost: pointer to host data
1455  *
1456  * Destroys all the flashnode session entries and all corresponding children
1457  * flashnode connection entries from sysfs
1458  */
1459 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1460 {
1461         device_for_each_child(&shost->shost_gendev, NULL,
1462                               iscsi_iter_destroy_flashnode_fn);
1463 }
1464 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1465
1466 /*
1467  * BSG support
1468  */
1469 /**
1470  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1471  * @job: bsg job to be processed
1472  */
1473 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1474 {
1475         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1476         struct iscsi_bsg_request *req = job->request;
1477         struct iscsi_bsg_reply *reply = job->reply;
1478         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1479         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1480         int ret;
1481
1482         /* check if we have the msgcode value at least */
1483         if (job->request_len < sizeof(uint32_t)) {
1484                 ret = -ENOMSG;
1485                 goto fail_host_msg;
1486         }
1487
1488         /* Validate the host command */
1489         switch (req->msgcode) {
1490         case ISCSI_BSG_HST_VENDOR:
1491                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1492                 if ((shost->hostt->vendor_id == 0L) ||
1493                     (req->rqst_data.h_vendor.vendor_id !=
1494                         shost->hostt->vendor_id)) {
1495                         ret = -ESRCH;
1496                         goto fail_host_msg;
1497                 }
1498                 break;
1499         default:
1500                 ret = -EBADR;
1501                 goto fail_host_msg;
1502         }
1503
1504         /* check if we really have all the request data needed */
1505         if (job->request_len < cmdlen) {
1506                 ret = -ENOMSG;
1507                 goto fail_host_msg;
1508         }
1509
1510         ret = i->iscsi_transport->bsg_request(job);
1511         if (!ret)
1512                 return 0;
1513
1514 fail_host_msg:
1515         /* return the errno failure code as the only status */
1516         BUG_ON(job->reply_len < sizeof(uint32_t));
1517         reply->reply_payload_rcv_len = 0;
1518         reply->result = ret;
1519         job->reply_len = sizeof(uint32_t);
1520         bsg_job_done(job, ret, 0);
1521         return 0;
1522 }
1523
1524 /**
1525  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1526  * @shost: shost for iscsi_host
1527  * @ihost: iscsi_cls_host adding the structures to
1528  */
1529 static int
1530 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1531 {
1532         struct device *dev = &shost->shost_gendev;
1533         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1534         struct request_queue *q;
1535         char bsg_name[20];
1536
1537         if (!i->iscsi_transport->bsg_request)
1538                 return -ENOTSUPP;
1539
1540         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1541         q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1542         if (IS_ERR(q)) {
1543                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1544                              "initialize - no request queue\n");
1545                 return PTR_ERR(q);
1546         }
1547         __scsi_init_queue(shost, q);
1548
1549         ihost->bsg_q = q;
1550         return 0;
1551 }
1552
1553 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1554                             struct device *cdev)
1555 {
1556         struct Scsi_Host *shost = dev_to_shost(dev);
1557         struct iscsi_cls_host *ihost = shost->shost_data;
1558
1559         memset(ihost, 0, sizeof(*ihost));
1560         atomic_set(&ihost->nr_scans, 0);
1561         mutex_init(&ihost->mutex);
1562
1563         iscsi_bsg_host_add(shost, ihost);
1564         /* ignore any bsg add error - we just can't do sgio */
1565
1566         return 0;
1567 }
1568
1569 static int iscsi_remove_host(struct transport_container *tc,
1570                              struct device *dev, struct device *cdev)
1571 {
1572         struct Scsi_Host *shost = dev_to_shost(dev);
1573         struct iscsi_cls_host *ihost = shost->shost_data;
1574
1575         bsg_remove_queue(ihost->bsg_q);
1576         return 0;
1577 }
1578
1579 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1580                                "iscsi_host",
1581                                iscsi_setup_host,
1582                                iscsi_remove_host,
1583                                NULL);
1584
1585 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1586                                "iscsi_session",
1587                                NULL,
1588                                NULL,
1589                                NULL);
1590
1591 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1592                                "iscsi_connection",
1593                                NULL,
1594                                NULL,
1595                                NULL);
1596
1597 static struct sock *nls;
1598 static DEFINE_MUTEX(rx_queue_mutex);
1599
1600 static LIST_HEAD(sesslist);
1601 static DEFINE_SPINLOCK(sesslock);
1602 static LIST_HEAD(connlist);
1603 static LIST_HEAD(connlist_err);
1604 static DEFINE_SPINLOCK(connlock);
1605
1606 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1607 {
1608         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1609         return sess->sid;
1610 }
1611
1612 /*
1613  * Returns the matching session to a given sid
1614  */
1615 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1616 {
1617         unsigned long flags;
1618         struct iscsi_cls_session *sess;
1619
1620         spin_lock_irqsave(&sesslock, flags);
1621         list_for_each_entry(sess, &sesslist, sess_list) {
1622                 if (sess->sid == sid) {
1623                         spin_unlock_irqrestore(&sesslock, flags);
1624                         return sess;
1625                 }
1626         }
1627         spin_unlock_irqrestore(&sesslock, flags);
1628         return NULL;
1629 }
1630
1631 /*
1632  * Returns the matching connection to a given sid / cid tuple
1633  */
1634 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1635 {
1636         unsigned long flags;
1637         struct iscsi_cls_conn *conn;
1638
1639         spin_lock_irqsave(&connlock, flags);
1640         list_for_each_entry(conn, &connlist, conn_list) {
1641                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1642                         spin_unlock_irqrestore(&connlock, flags);
1643                         return conn;
1644                 }
1645         }
1646         spin_unlock_irqrestore(&connlock, flags);
1647         return NULL;
1648 }
1649
1650 /*
1651  * The following functions can be used by LLDs that allocate
1652  * their own scsi_hosts or by software iscsi LLDs
1653  */
1654 static struct {
1655         int value;
1656         char *name;
1657 } iscsi_session_state_names[] = {
1658         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1659         { ISCSI_SESSION_FAILED,         "FAILED" },
1660         { ISCSI_SESSION_FREE,           "FREE" },
1661 };
1662
1663 static const char *iscsi_session_state_name(int state)
1664 {
1665         int i;
1666         char *name = NULL;
1667
1668         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1669                 if (iscsi_session_state_names[i].value == state) {
1670                         name = iscsi_session_state_names[i].name;
1671                         break;
1672                 }
1673         }
1674         return name;
1675 }
1676
1677 int iscsi_session_chkready(struct iscsi_cls_session *session)
1678 {
1679         int err;
1680
1681         switch (session->state) {
1682         case ISCSI_SESSION_LOGGED_IN:
1683                 err = 0;
1684                 break;
1685         case ISCSI_SESSION_FAILED:
1686                 err = DID_IMM_RETRY << 16;
1687                 break;
1688         case ISCSI_SESSION_FREE:
1689                 err = DID_TRANSPORT_FAILFAST << 16;
1690                 break;
1691         default:
1692                 err = DID_NO_CONNECT << 16;
1693                 break;
1694         }
1695         return err;
1696 }
1697 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1698
1699 int iscsi_is_session_online(struct iscsi_cls_session *session)
1700 {
1701         unsigned long flags;
1702         int ret = 0;
1703
1704         spin_lock_irqsave(&session->lock, flags);
1705         if (session->state == ISCSI_SESSION_LOGGED_IN)
1706                 ret = 1;
1707         spin_unlock_irqrestore(&session->lock, flags);
1708         return ret;
1709 }
1710 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1711
1712 static void iscsi_session_release(struct device *dev)
1713 {
1714         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1715         struct Scsi_Host *shost;
1716
1717         shost = iscsi_session_to_shost(session);
1718         scsi_host_put(shost);
1719         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1720         kfree(session);
1721 }
1722
1723 int iscsi_is_session_dev(const struct device *dev)
1724 {
1725         return dev->release == iscsi_session_release;
1726 }
1727 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1728
1729 static int iscsi_iter_session_fn(struct device *dev, void *data)
1730 {
1731         void (* fn) (struct iscsi_cls_session *) = data;
1732
1733         if (!iscsi_is_session_dev(dev))
1734                 return 0;
1735         fn(iscsi_dev_to_session(dev));
1736         return 0;
1737 }
1738
1739 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1740                                  void (*fn)(struct iscsi_cls_session *))
1741 {
1742         device_for_each_child(&shost->shost_gendev, fn,
1743                               iscsi_iter_session_fn);
1744 }
1745 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1746
1747 /**
1748  * iscsi_scan_finished - helper to report when running scans are done
1749  * @shost: scsi host
1750  * @time: scan run time
1751  *
1752  * This function can be used by drives like qla4xxx to report to the scsi
1753  * layer when the scans it kicked off at module load time are done.
1754  */
1755 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1756 {
1757         struct iscsi_cls_host *ihost = shost->shost_data;
1758         /*
1759          * qla4xxx will have kicked off some session unblocks before calling
1760          * scsi_scan_host, so just wait for them to complete.
1761          */
1762         return !atomic_read(&ihost->nr_scans);
1763 }
1764 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1765
1766 struct iscsi_scan_data {
1767         unsigned int channel;
1768         unsigned int id;
1769         u64 lun;
1770         enum scsi_scan_mode rescan;
1771 };
1772
1773 static int iscsi_user_scan_session(struct device *dev, void *data)
1774 {
1775         struct iscsi_scan_data *scan_data = data;
1776         struct iscsi_cls_session *session;
1777         struct Scsi_Host *shost;
1778         struct iscsi_cls_host *ihost;
1779         unsigned long flags;
1780         unsigned int id;
1781
1782         if (!iscsi_is_session_dev(dev))
1783                 return 0;
1784
1785         session = iscsi_dev_to_session(dev);
1786
1787         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1788
1789         shost = iscsi_session_to_shost(session);
1790         ihost = shost->shost_data;
1791
1792         mutex_lock(&ihost->mutex);
1793         spin_lock_irqsave(&session->lock, flags);
1794         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1795                 spin_unlock_irqrestore(&session->lock, flags);
1796                 goto user_scan_exit;
1797         }
1798         id = session->target_id;
1799         spin_unlock_irqrestore(&session->lock, flags);
1800
1801         if (id != ISCSI_MAX_TARGET) {
1802                 if ((scan_data->channel == SCAN_WILD_CARD ||
1803                      scan_data->channel == 0) &&
1804                     (scan_data->id == SCAN_WILD_CARD ||
1805                      scan_data->id == id))
1806                         scsi_scan_target(&session->dev, 0, id,
1807                                          scan_data->lun, scan_data->rescan);
1808         }
1809
1810 user_scan_exit:
1811         mutex_unlock(&ihost->mutex);
1812         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1813         return 0;
1814 }
1815
1816 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1817                            uint id, u64 lun)
1818 {
1819         struct iscsi_scan_data scan_data;
1820
1821         scan_data.channel = channel;
1822         scan_data.id = id;
1823         scan_data.lun = lun;
1824         scan_data.rescan = SCSI_SCAN_MANUAL;
1825
1826         return device_for_each_child(&shost->shost_gendev, &scan_data,
1827                                      iscsi_user_scan_session);
1828 }
1829
1830 static void iscsi_scan_session(struct work_struct *work)
1831 {
1832         struct iscsi_cls_session *session =
1833                         container_of(work, struct iscsi_cls_session, scan_work);
1834         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1835         struct iscsi_cls_host *ihost = shost->shost_data;
1836         struct iscsi_scan_data scan_data;
1837
1838         scan_data.channel = 0;
1839         scan_data.id = SCAN_WILD_CARD;
1840         scan_data.lun = SCAN_WILD_CARD;
1841         scan_data.rescan = SCSI_SCAN_RESCAN;
1842
1843         iscsi_user_scan_session(&session->dev, &scan_data);
1844         atomic_dec(&ihost->nr_scans);
1845 }
1846
1847 /**
1848  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1849  * @cmd: scsi cmd passed to scsi eh handler
1850  *
1851  * If the session is down this function will wait for the recovery
1852  * timer to fire or for the session to be logged back in. If the
1853  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1854  * should pass this error value to the scsi eh.
1855  */
1856 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1857 {
1858         struct iscsi_cls_session *session =
1859                         starget_to_session(scsi_target(cmd->device));
1860         unsigned long flags;
1861         int ret = 0;
1862
1863         spin_lock_irqsave(&session->lock, flags);
1864         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1865                 if (session->state == ISCSI_SESSION_FREE) {
1866                         ret = FAST_IO_FAIL;
1867                         break;
1868                 }
1869                 spin_unlock_irqrestore(&session->lock, flags);
1870                 msleep(1000);
1871                 spin_lock_irqsave(&session->lock, flags);
1872         }
1873         spin_unlock_irqrestore(&session->lock, flags);
1874         return ret;
1875 }
1876 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1877
1878 static void session_recovery_timedout(struct work_struct *work)
1879 {
1880         struct iscsi_cls_session *session =
1881                 container_of(work, struct iscsi_cls_session,
1882                              recovery_work.work);
1883         unsigned long flags;
1884
1885         iscsi_cls_session_printk(KERN_INFO, session,
1886                                  "session recovery timed out after %d secs\n",
1887                                  session->recovery_tmo);
1888
1889         spin_lock_irqsave(&session->lock, flags);
1890         switch (session->state) {
1891         case ISCSI_SESSION_FAILED:
1892                 session->state = ISCSI_SESSION_FREE;
1893                 break;
1894         case ISCSI_SESSION_LOGGED_IN:
1895         case ISCSI_SESSION_FREE:
1896                 /* we raced with the unblock's flush */
1897                 spin_unlock_irqrestore(&session->lock, flags);
1898                 return;
1899         }
1900         spin_unlock_irqrestore(&session->lock, flags);
1901
1902         if (session->transport->session_recovery_timedout)
1903                 session->transport->session_recovery_timedout(session);
1904
1905         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1906         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1907         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1908 }
1909
1910 static void __iscsi_unblock_session(struct work_struct *work)
1911 {
1912         struct iscsi_cls_session *session =
1913                         container_of(work, struct iscsi_cls_session,
1914                                      unblock_work);
1915         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1916         struct iscsi_cls_host *ihost = shost->shost_data;
1917         unsigned long flags;
1918
1919         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1920         /*
1921          * The recovery and unblock work get run from the same workqueue,
1922          * so try to cancel it if it was going to run after this unblock.
1923          */
1924         cancel_delayed_work(&session->recovery_work);
1925         spin_lock_irqsave(&session->lock, flags);
1926         session->state = ISCSI_SESSION_LOGGED_IN;
1927         spin_unlock_irqrestore(&session->lock, flags);
1928         /* start IO */
1929         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1930         /*
1931          * Only do kernel scanning if the driver is properly hooked into
1932          * the async scanning code (drivers like iscsi_tcp do login and
1933          * scanning from userspace).
1934          */
1935         if (shost->hostt->scan_finished) {
1936                 if (scsi_queue_work(shost, &session->scan_work))
1937                         atomic_inc(&ihost->nr_scans);
1938         }
1939         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1940 }
1941
1942 /**
1943  * iscsi_unblock_session - set a session as logged in and start IO.
1944  * @session: iscsi session
1945  *
1946  * Mark a session as ready to accept IO.
1947  */
1948 void iscsi_unblock_session(struct iscsi_cls_session *session)
1949 {
1950         flush_work(&session->block_work);
1951
1952         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1953         /*
1954          * Blocking the session can be done from any context so we only
1955          * queue the block work. Make sure the unblock work has completed
1956          * because it flushes/cancels the other works and updates the state.
1957          */
1958         flush_work(&session->unblock_work);
1959 }
1960 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1961
1962 static void __iscsi_block_session(struct work_struct *work)
1963 {
1964         struct iscsi_cls_session *session =
1965                         container_of(work, struct iscsi_cls_session,
1966                                      block_work);
1967         unsigned long flags;
1968
1969         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1970         spin_lock_irqsave(&session->lock, flags);
1971         session->state = ISCSI_SESSION_FAILED;
1972         spin_unlock_irqrestore(&session->lock, flags);
1973         scsi_target_block(&session->dev);
1974         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1975         if (session->recovery_tmo >= 0)
1976                 queue_delayed_work(iscsi_eh_timer_workq,
1977                                    &session->recovery_work,
1978                                    session->recovery_tmo * HZ);
1979 }
1980
1981 void iscsi_block_session(struct iscsi_cls_session *session)
1982 {
1983         queue_work(iscsi_eh_timer_workq, &session->block_work);
1984 }
1985 EXPORT_SYMBOL_GPL(iscsi_block_session);
1986
1987 static void __iscsi_unbind_session(struct work_struct *work)
1988 {
1989         struct iscsi_cls_session *session =
1990                         container_of(work, struct iscsi_cls_session,
1991                                      unbind_work);
1992         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1993         struct iscsi_cls_host *ihost = shost->shost_data;
1994         unsigned long flags;
1995         unsigned int target_id;
1996
1997         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
1998
1999         /* Prevent new scans and make sure scanning is not in progress */
2000         mutex_lock(&ihost->mutex);
2001         spin_lock_irqsave(&session->lock, flags);
2002         if (session->target_id == ISCSI_MAX_TARGET) {
2003                 spin_unlock_irqrestore(&session->lock, flags);
2004                 mutex_unlock(&ihost->mutex);
2005                 goto unbind_session_exit;
2006         }
2007
2008         target_id = session->target_id;
2009         session->target_id = ISCSI_MAX_TARGET;
2010         spin_unlock_irqrestore(&session->lock, flags);
2011         mutex_unlock(&ihost->mutex);
2012
2013         scsi_remove_target(&session->dev);
2014
2015         if (session->ida_used)
2016                 ida_simple_remove(&iscsi_sess_ida, target_id);
2017
2018 unbind_session_exit:
2019         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2020         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2021 }
2022
2023 static void __iscsi_destroy_session(struct work_struct *work)
2024 {
2025         struct iscsi_cls_session *session =
2026                 container_of(work, struct iscsi_cls_session, destroy_work);
2027
2028         session->transport->destroy_session(session);
2029 }
2030
2031 struct iscsi_cls_session *
2032 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2033                     int dd_size)
2034 {
2035         struct iscsi_cls_session *session;
2036
2037         session = kzalloc(sizeof(*session) + dd_size,
2038                           GFP_KERNEL);
2039         if (!session)
2040                 return NULL;
2041
2042         session->transport = transport;
2043         session->creator = -1;
2044         session->recovery_tmo = 120;
2045         session->recovery_tmo_sysfs_override = false;
2046         session->state = ISCSI_SESSION_FREE;
2047         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2048         INIT_LIST_HEAD(&session->sess_list);
2049         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2050         INIT_WORK(&session->block_work, __iscsi_block_session);
2051         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2052         INIT_WORK(&session->scan_work, iscsi_scan_session);
2053         INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2054         spin_lock_init(&session->lock);
2055
2056         /* this is released in the dev's release function */
2057         scsi_host_get(shost);
2058         session->dev.parent = &shost->shost_gendev;
2059         session->dev.release = iscsi_session_release;
2060         device_initialize(&session->dev);
2061         if (dd_size)
2062                 session->dd_data = &session[1];
2063
2064         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2065         return session;
2066 }
2067 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2068
2069 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2070 {
2071         unsigned long flags;
2072         int id = 0;
2073         int err;
2074
2075         session->sid = atomic_add_return(1, &iscsi_session_nr);
2076
2077         if (target_id == ISCSI_MAX_TARGET) {
2078                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2079
2080                 if (id < 0) {
2081                         iscsi_cls_session_printk(KERN_ERR, session,
2082                                         "Failure in Target ID Allocation\n");
2083                         return id;
2084                 }
2085                 session->target_id = (unsigned int)id;
2086                 session->ida_used = true;
2087         } else
2088                 session->target_id = target_id;
2089
2090         dev_set_name(&session->dev, "session%u", session->sid);
2091         err = device_add(&session->dev);
2092         if (err) {
2093                 iscsi_cls_session_printk(KERN_ERR, session,
2094                                          "could not register session's dev\n");
2095                 goto release_ida;
2096         }
2097         err = transport_register_device(&session->dev);
2098         if (err) {
2099                 iscsi_cls_session_printk(KERN_ERR, session,
2100                                          "could not register transport's dev\n");
2101                 goto release_dev;
2102         }
2103
2104         spin_lock_irqsave(&sesslock, flags);
2105         list_add(&session->sess_list, &sesslist);
2106         spin_unlock_irqrestore(&sesslock, flags);
2107
2108         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2109         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2110         return 0;
2111
2112 release_dev:
2113         device_del(&session->dev);
2114 release_ida:
2115         if (session->ida_used)
2116                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2117
2118         return err;
2119 }
2120 EXPORT_SYMBOL_GPL(iscsi_add_session);
2121
2122 /**
2123  * iscsi_create_session - create iscsi class session
2124  * @shost: scsi host
2125  * @transport: iscsi transport
2126  * @dd_size: private driver data size
2127  * @target_id: which target
2128  *
2129  * This can be called from a LLD or iscsi_transport.
2130  */
2131 struct iscsi_cls_session *
2132 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2133                      int dd_size, unsigned int target_id)
2134 {
2135         struct iscsi_cls_session *session;
2136
2137         session = iscsi_alloc_session(shost, transport, dd_size);
2138         if (!session)
2139                 return NULL;
2140
2141         if (iscsi_add_session(session, target_id)) {
2142                 iscsi_free_session(session);
2143                 return NULL;
2144         }
2145         return session;
2146 }
2147 EXPORT_SYMBOL_GPL(iscsi_create_session);
2148
2149 static void iscsi_conn_release(struct device *dev)
2150 {
2151         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2152         struct device *parent = conn->dev.parent;
2153
2154         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2155         kfree(conn);
2156         put_device(parent);
2157 }
2158
2159 static int iscsi_is_conn_dev(const struct device *dev)
2160 {
2161         return dev->release == iscsi_conn_release;
2162 }
2163
2164 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2165 {
2166         if (!iscsi_is_conn_dev(dev))
2167                 return 0;
2168         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2169 }
2170
2171 void iscsi_remove_session(struct iscsi_cls_session *session)
2172 {
2173         unsigned long flags;
2174         int err;
2175
2176         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2177
2178         spin_lock_irqsave(&sesslock, flags);
2179         if (!list_empty(&session->sess_list))
2180                 list_del(&session->sess_list);
2181         spin_unlock_irqrestore(&sesslock, flags);
2182
2183         flush_work(&session->block_work);
2184         flush_work(&session->unblock_work);
2185         cancel_delayed_work_sync(&session->recovery_work);
2186         /*
2187          * If we are blocked let commands flow again. The lld or iscsi
2188          * layer should set up the queuecommand to fail commands.
2189          * We assume that LLD will not be calling block/unblock while
2190          * removing the session.
2191          */
2192         spin_lock_irqsave(&session->lock, flags);
2193         session->state = ISCSI_SESSION_FREE;
2194         spin_unlock_irqrestore(&session->lock, flags);
2195
2196         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2197         /* flush running scans then delete devices */
2198         flush_work(&session->scan_work);
2199         /* flush running unbind operations */
2200         flush_work(&session->unbind_work);
2201         __iscsi_unbind_session(&session->unbind_work);
2202
2203         /* hw iscsi may not have removed all connections from session */
2204         err = device_for_each_child(&session->dev, NULL,
2205                                     iscsi_iter_destroy_conn_fn);
2206         if (err)
2207                 iscsi_cls_session_printk(KERN_ERR, session,
2208                                          "Could not delete all connections "
2209                                          "for session. Error %d.\n", err);
2210
2211         transport_unregister_device(&session->dev);
2212
2213         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2214         device_del(&session->dev);
2215 }
2216 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2217
2218 static void iscsi_stop_conn(struct iscsi_cls_conn *conn, int flag)
2219 {
2220         ISCSI_DBG_TRANS_CONN(conn, "Stopping conn.\n");
2221
2222         switch (flag) {
2223         case STOP_CONN_RECOVER:
2224                 conn->state = ISCSI_CONN_FAILED;
2225                 break;
2226         case STOP_CONN_TERM:
2227                 conn->state = ISCSI_CONN_DOWN;
2228                 break;
2229         default:
2230                 iscsi_cls_conn_printk(KERN_ERR, conn, "invalid stop flag %d\n",
2231                                       flag);
2232                 return;
2233         }
2234
2235         conn->transport->stop_conn(conn, flag);
2236         ISCSI_DBG_TRANS_CONN(conn, "Stopping conn done.\n");
2237 }
2238
2239 static int iscsi_if_stop_conn(struct iscsi_transport *transport,
2240                               struct iscsi_uevent *ev)
2241 {
2242         int flag = ev->u.stop_conn.flag;
2243         struct iscsi_cls_conn *conn;
2244
2245         conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
2246         if (!conn)
2247                 return -EINVAL;
2248
2249         ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop.\n");
2250         /*
2251          * If this is a termination we have to call stop_conn with that flag
2252          * so the correct states get set. If we haven't run the work yet try to
2253          * avoid the extra run.
2254          */
2255         if (flag == STOP_CONN_TERM) {
2256                 cancel_work_sync(&conn->cleanup_work);
2257                 iscsi_stop_conn(conn, flag);
2258         } else {
2259                 /*
2260                  * Figure out if it was the kernel or userspace initiating this.
2261                  */
2262                 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2263                         iscsi_stop_conn(conn, flag);
2264                 } else {
2265                         ISCSI_DBG_TRANS_CONN(conn,
2266                                              "flush kernel conn cleanup.\n");
2267                         flush_work(&conn->cleanup_work);
2268                 }
2269                 /*
2270                  * Only clear for recovery to avoid extra cleanup runs during
2271                  * termination.
2272                  */
2273                 clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2274         }
2275         ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop done.\n");
2276         return 0;
2277 }
2278
2279 static void iscsi_ep_disconnect(struct iscsi_cls_conn *conn, bool is_active)
2280 {
2281         struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2282         struct iscsi_endpoint *ep;
2283
2284         ISCSI_DBG_TRANS_CONN(conn, "disconnect ep.\n");
2285         conn->state = ISCSI_CONN_FAILED;
2286
2287         if (!conn->ep || !session->transport->ep_disconnect)
2288                 return;
2289
2290         ep = conn->ep;
2291         conn->ep = NULL;
2292
2293         session->transport->unbind_conn(conn, is_active);
2294         session->transport->ep_disconnect(ep);
2295         ISCSI_DBG_TRANS_CONN(conn, "disconnect ep done.\n");
2296 }
2297
2298 static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
2299 {
2300         struct iscsi_cls_conn *conn = container_of(work, struct iscsi_cls_conn,
2301                                                    cleanup_work);
2302         struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2303
2304         mutex_lock(&conn->ep_mutex);
2305         /*
2306          * If we are not at least bound there is nothing for us to do. Userspace
2307          * will do a ep_disconnect call if offload is used, but will not be
2308          * doing a stop since there is nothing to clean up, so we have to clear
2309          * the cleanup bit here.
2310          */
2311         if (conn->state != ISCSI_CONN_BOUND && conn->state != ISCSI_CONN_UP) {
2312                 ISCSI_DBG_TRANS_CONN(conn, "Got error while conn is already failed. Ignoring.\n");
2313                 clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2314                 mutex_unlock(&conn->ep_mutex);
2315                 return;
2316         }
2317
2318         iscsi_ep_disconnect(conn, false);
2319
2320         if (system_state != SYSTEM_RUNNING) {
2321                 /*
2322                  * If the user has set up for the session to never timeout
2323                  * then hang like they wanted. For all other cases fail right
2324                  * away since userspace is not going to relogin.
2325                  */
2326                 if (session->recovery_tmo > 0)
2327                         session->recovery_tmo = 0;
2328         }
2329
2330         iscsi_stop_conn(conn, STOP_CONN_RECOVER);
2331         mutex_unlock(&conn->ep_mutex);
2332         ISCSI_DBG_TRANS_CONN(conn, "cleanup done.\n");
2333 }
2334
2335 void iscsi_free_session(struct iscsi_cls_session *session)
2336 {
2337         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2338         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2339         put_device(&session->dev);
2340 }
2341 EXPORT_SYMBOL_GPL(iscsi_free_session);
2342
2343 /**
2344  * iscsi_create_conn - create iscsi class connection
2345  * @session: iscsi cls session
2346  * @dd_size: private driver data size
2347  * @cid: connection id
2348  *
2349  * This can be called from a LLD or iscsi_transport. The connection
2350  * is child of the session so cid must be unique for all connections
2351  * on the session.
2352  *
2353  * Since we do not support MCS, cid will normally be zero. In some cases
2354  * for software iscsi we could be trying to preallocate a connection struct
2355  * in which case there could be two connection structs and cid would be
2356  * non-zero.
2357  */
2358 struct iscsi_cls_conn *
2359 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2360 {
2361         struct iscsi_transport *transport = session->transport;
2362         struct iscsi_cls_conn *conn;
2363         unsigned long flags;
2364         int err;
2365
2366         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2367         if (!conn)
2368                 return NULL;
2369         if (dd_size)
2370                 conn->dd_data = &conn[1];
2371
2372         mutex_init(&conn->ep_mutex);
2373         INIT_LIST_HEAD(&conn->conn_list);
2374         INIT_WORK(&conn->cleanup_work, iscsi_cleanup_conn_work_fn);
2375         conn->transport = transport;
2376         conn->cid = cid;
2377         conn->state = ISCSI_CONN_DOWN;
2378
2379         /* this is released in the dev's release function */
2380         if (!get_device(&session->dev))
2381                 goto free_conn;
2382
2383         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2384         conn->dev.parent = &session->dev;
2385         conn->dev.release = iscsi_conn_release;
2386         err = device_register(&conn->dev);
2387         if (err) {
2388                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2389                                          "register connection's dev\n");
2390                 goto release_parent_ref;
2391         }
2392         err = transport_register_device(&conn->dev);
2393         if (err) {
2394                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2395                                          "register transport's dev\n");
2396                 goto release_conn_ref;
2397         }
2398
2399         spin_lock_irqsave(&connlock, flags);
2400         list_add(&conn->conn_list, &connlist);
2401         spin_unlock_irqrestore(&connlock, flags);
2402
2403         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2404         return conn;
2405
2406 release_conn_ref:
2407         device_unregister(&conn->dev);
2408         put_device(&session->dev);
2409         return NULL;
2410 release_parent_ref:
2411         put_device(&session->dev);
2412 free_conn:
2413         kfree(conn);
2414         return NULL;
2415 }
2416
2417 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2418
2419 /**
2420  * iscsi_destroy_conn - destroy iscsi class connection
2421  * @conn: iscsi cls session
2422  *
2423  * This can be called from a LLD or iscsi_transport.
2424  */
2425 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2426 {
2427         unsigned long flags;
2428
2429         spin_lock_irqsave(&connlock, flags);
2430         list_del(&conn->conn_list);
2431         spin_unlock_irqrestore(&connlock, flags);
2432
2433         transport_unregister_device(&conn->dev);
2434         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2435         device_unregister(&conn->dev);
2436         return 0;
2437 }
2438 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2439
2440 void iscsi_put_conn(struct iscsi_cls_conn *conn)
2441 {
2442         put_device(&conn->dev);
2443 }
2444 EXPORT_SYMBOL_GPL(iscsi_put_conn);
2445
2446 void iscsi_get_conn(struct iscsi_cls_conn *conn)
2447 {
2448         get_device(&conn->dev);
2449 }
2450 EXPORT_SYMBOL_GPL(iscsi_get_conn);
2451
2452 /*
2453  * iscsi interface functions
2454  */
2455 static struct iscsi_internal *
2456 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2457 {
2458         struct iscsi_internal *priv;
2459         unsigned long flags;
2460
2461         spin_lock_irqsave(&iscsi_transport_lock, flags);
2462         list_for_each_entry(priv, &iscsi_transports, list) {
2463                 if (tt == priv->iscsi_transport) {
2464                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2465                         return priv;
2466                 }
2467         }
2468         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2469         return NULL;
2470 }
2471
2472 static int
2473 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2474 {
2475         return nlmsg_multicast(nls, skb, 0, group, gfp);
2476 }
2477
2478 static int
2479 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2480 {
2481         return nlmsg_unicast(nls, skb, portid);
2482 }
2483
2484 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2485                    char *data, uint32_t data_size)
2486 {
2487         struct nlmsghdr *nlh;
2488         struct sk_buff *skb;
2489         struct iscsi_uevent *ev;
2490         char *pdu;
2491         struct iscsi_internal *priv;
2492         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2493                                    data_size);
2494
2495         priv = iscsi_if_transport_lookup(conn->transport);
2496         if (!priv)
2497                 return -EINVAL;
2498
2499         skb = alloc_skb(len, GFP_ATOMIC);
2500         if (!skb) {
2501                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2502                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2503                                       "control PDU: OOM\n");
2504                 return -ENOMEM;
2505         }
2506
2507         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2508         ev = nlmsg_data(nlh);
2509         memset(ev, 0, sizeof(*ev));
2510         ev->transport_handle = iscsi_handle(conn->transport);
2511         ev->type = ISCSI_KEVENT_RECV_PDU;
2512         ev->r.recv_req.cid = conn->cid;
2513         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2514         pdu = (char*)ev + sizeof(*ev);
2515         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2516         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2517
2518         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2519 }
2520 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2521
2522 int iscsi_offload_mesg(struct Scsi_Host *shost,
2523                        struct iscsi_transport *transport, uint32_t type,
2524                        char *data, uint16_t data_size)
2525 {
2526         struct nlmsghdr *nlh;
2527         struct sk_buff *skb;
2528         struct iscsi_uevent *ev;
2529         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2530
2531         skb = alloc_skb(len, GFP_ATOMIC);
2532         if (!skb) {
2533                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2534                 return -ENOMEM;
2535         }
2536
2537         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2538         ev = nlmsg_data(nlh);
2539         memset(ev, 0, sizeof(*ev));
2540         ev->type = type;
2541         ev->transport_handle = iscsi_handle(transport);
2542         switch (type) {
2543         case ISCSI_KEVENT_PATH_REQ:
2544                 ev->r.req_path.host_no = shost->host_no;
2545                 break;
2546         case ISCSI_KEVENT_IF_DOWN:
2547                 ev->r.notify_if_down.host_no = shost->host_no;
2548                 break;
2549         }
2550
2551         memcpy((char *)ev + sizeof(*ev), data, data_size);
2552
2553         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2554 }
2555 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2556
2557 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2558 {
2559         struct nlmsghdr *nlh;
2560         struct sk_buff  *skb;
2561         struct iscsi_uevent *ev;
2562         struct iscsi_internal *priv;
2563         int len = nlmsg_total_size(sizeof(*ev));
2564
2565         if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags))
2566                 queue_work(iscsi_conn_cleanup_workq, &conn->cleanup_work);
2567
2568         priv = iscsi_if_transport_lookup(conn->transport);
2569         if (!priv)
2570                 return;
2571
2572         skb = alloc_skb(len, GFP_ATOMIC);
2573         if (!skb) {
2574                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2575                                       "conn error (%d)\n", error);
2576                 return;
2577         }
2578
2579         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2580         ev = nlmsg_data(nlh);
2581         ev->transport_handle = iscsi_handle(conn->transport);
2582         ev->type = ISCSI_KEVENT_CONN_ERROR;
2583         ev->r.connerror.error = error;
2584         ev->r.connerror.cid = conn->cid;
2585         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2586
2587         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2588
2589         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2590                               error);
2591 }
2592 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2593
2594 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2595                             enum iscsi_conn_state state)
2596 {
2597         struct nlmsghdr *nlh;
2598         struct sk_buff  *skb;
2599         struct iscsi_uevent *ev;
2600         struct iscsi_internal *priv;
2601         int len = nlmsg_total_size(sizeof(*ev));
2602
2603         priv = iscsi_if_transport_lookup(conn->transport);
2604         if (!priv)
2605                 return;
2606
2607         skb = alloc_skb(len, GFP_ATOMIC);
2608         if (!skb) {
2609                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2610                                       "conn login (%d)\n", state);
2611                 return;
2612         }
2613
2614         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2615         ev = nlmsg_data(nlh);
2616         ev->transport_handle = iscsi_handle(conn->transport);
2617         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2618         ev->r.conn_login.state = state;
2619         ev->r.conn_login.cid = conn->cid;
2620         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2621         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2622
2623         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2624                               state);
2625 }
2626 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2627
2628 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2629                            enum iscsi_host_event_code code, uint32_t data_size,
2630                            uint8_t *data)
2631 {
2632         struct nlmsghdr *nlh;
2633         struct sk_buff *skb;
2634         struct iscsi_uevent *ev;
2635         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2636
2637         skb = alloc_skb(len, GFP_NOIO);
2638         if (!skb) {
2639                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2640                        host_no, code);
2641                 return;
2642         }
2643
2644         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2645         ev = nlmsg_data(nlh);
2646         ev->transport_handle = iscsi_handle(transport);
2647         ev->type = ISCSI_KEVENT_HOST_EVENT;
2648         ev->r.host_event.host_no = host_no;
2649         ev->r.host_event.code = code;
2650         ev->r.host_event.data_size = data_size;
2651
2652         if (data_size)
2653                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2654
2655         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2656 }
2657 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2658
2659 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2660                            uint32_t status, uint32_t pid, uint32_t data_size,
2661                            uint8_t *data)
2662 {
2663         struct nlmsghdr *nlh;
2664         struct sk_buff *skb;
2665         struct iscsi_uevent *ev;
2666         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2667
2668         skb = alloc_skb(len, GFP_NOIO);
2669         if (!skb) {
2670                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2671                 return;
2672         }
2673
2674         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2675         ev = nlmsg_data(nlh);
2676         ev->transport_handle = iscsi_handle(transport);
2677         ev->type = ISCSI_KEVENT_PING_COMP;
2678         ev->r.ping_comp.host_no = host_no;
2679         ev->r.ping_comp.status = status;
2680         ev->r.ping_comp.pid = pid;
2681         ev->r.ping_comp.data_size = data_size;
2682         memcpy((char *)ev + sizeof(*ev), data, data_size);
2683
2684         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2685 }
2686 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2687
2688 static int
2689 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2690 {
2691         struct sk_buff  *skb;
2692         struct nlmsghdr *nlh;
2693         int len = nlmsg_total_size(size);
2694
2695         skb = alloc_skb(len, GFP_ATOMIC);
2696         if (!skb) {
2697                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2698                 return -ENOMEM;
2699         }
2700
2701         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2702         memcpy(nlmsg_data(nlh), payload, size);
2703         return iscsi_unicast_skb(skb, portid);
2704 }
2705
2706 static int
2707 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2708 {
2709         struct iscsi_uevent *ev = nlmsg_data(nlh);
2710         struct iscsi_stats *stats;
2711         struct sk_buff *skbstat;
2712         struct iscsi_cls_conn *conn;
2713         struct nlmsghdr *nlhstat;
2714         struct iscsi_uevent *evstat;
2715         struct iscsi_internal *priv;
2716         int len = nlmsg_total_size(sizeof(*ev) +
2717                                    sizeof(struct iscsi_stats) +
2718                                    sizeof(struct iscsi_stats_custom) *
2719                                    ISCSI_STATS_CUSTOM_MAX);
2720         int err = 0;
2721
2722         priv = iscsi_if_transport_lookup(transport);
2723         if (!priv)
2724                 return -EINVAL;
2725
2726         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2727         if (!conn)
2728                 return -EEXIST;
2729
2730         do {
2731                 int actual_size;
2732
2733                 skbstat = alloc_skb(len, GFP_ATOMIC);
2734                 if (!skbstat) {
2735                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2736                                               "deliver stats: OOM\n");
2737                         return -ENOMEM;
2738                 }
2739
2740                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2741                                       (len - sizeof(*nlhstat)), 0);
2742                 evstat = nlmsg_data(nlhstat);
2743                 memset(evstat, 0, sizeof(*evstat));
2744                 evstat->transport_handle = iscsi_handle(conn->transport);
2745                 evstat->type = nlh->nlmsg_type;
2746                 evstat->u.get_stats.cid =
2747                         ev->u.get_stats.cid;
2748                 evstat->u.get_stats.sid =
2749                         ev->u.get_stats.sid;
2750                 stats = (struct iscsi_stats *)
2751                         ((char*)evstat + sizeof(*evstat));
2752                 memset(stats, 0, sizeof(*stats));
2753
2754                 transport->get_stats(conn, stats);
2755                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2756                                                sizeof(struct iscsi_stats) +
2757                                                sizeof(struct iscsi_stats_custom) *
2758                                                stats->custom_length);
2759                 actual_size -= sizeof(*nlhstat);
2760                 actual_size = nlmsg_msg_size(actual_size);
2761                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2762                 nlhstat->nlmsg_len = actual_size;
2763
2764                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2765                                           GFP_ATOMIC);
2766         } while (err < 0 && err != -ECONNREFUSED);
2767
2768         return err;
2769 }
2770
2771 /**
2772  * iscsi_session_event - send session destr. completion event
2773  * @session: iscsi class session
2774  * @event: type of event
2775  */
2776 int iscsi_session_event(struct iscsi_cls_session *session,
2777                         enum iscsi_uevent_e event)
2778 {
2779         struct iscsi_internal *priv;
2780         struct Scsi_Host *shost;
2781         struct iscsi_uevent *ev;
2782         struct sk_buff  *skb;
2783         struct nlmsghdr *nlh;
2784         int rc, len = nlmsg_total_size(sizeof(*ev));
2785
2786         priv = iscsi_if_transport_lookup(session->transport);
2787         if (!priv)
2788                 return -EINVAL;
2789         shost = iscsi_session_to_shost(session);
2790
2791         skb = alloc_skb(len, GFP_KERNEL);
2792         if (!skb) {
2793                 iscsi_cls_session_printk(KERN_ERR, session,
2794                                          "Cannot notify userspace of session "
2795                                          "event %u\n", event);
2796                 return -ENOMEM;
2797         }
2798
2799         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2800         ev = nlmsg_data(nlh);
2801         ev->transport_handle = iscsi_handle(session->transport);
2802
2803         ev->type = event;
2804         switch (event) {
2805         case ISCSI_KEVENT_DESTROY_SESSION:
2806                 ev->r.d_session.host_no = shost->host_no;
2807                 ev->r.d_session.sid = session->sid;
2808                 break;
2809         case ISCSI_KEVENT_CREATE_SESSION:
2810                 ev->r.c_session_ret.host_no = shost->host_no;
2811                 ev->r.c_session_ret.sid = session->sid;
2812                 break;
2813         case ISCSI_KEVENT_UNBIND_SESSION:
2814                 ev->r.unbind_session.host_no = shost->host_no;
2815                 ev->r.unbind_session.sid = session->sid;
2816                 break;
2817         default:
2818                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2819                                          "%u.\n", event);
2820                 kfree_skb(skb);
2821                 return -EINVAL;
2822         }
2823
2824         /*
2825          * this will occur if the daemon is not up, so we just warn
2826          * the user and when the daemon is restarted it will handle it
2827          */
2828         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2829         if (rc == -ESRCH)
2830                 iscsi_cls_session_printk(KERN_ERR, session,
2831                                          "Cannot notify userspace of session "
2832                                          "event %u. Check iscsi daemon\n",
2833                                          event);
2834
2835         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2836                                 event, rc);
2837         return rc;
2838 }
2839 EXPORT_SYMBOL_GPL(iscsi_session_event);
2840
2841 static int
2842 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2843                         struct iscsi_uevent *ev, pid_t pid,
2844                         uint32_t initial_cmdsn, uint16_t cmds_max,
2845                         uint16_t queue_depth)
2846 {
2847         struct iscsi_transport *transport = priv->iscsi_transport;
2848         struct iscsi_cls_session *session;
2849         struct Scsi_Host *shost;
2850
2851         session = transport->create_session(ep, cmds_max, queue_depth,
2852                                             initial_cmdsn);
2853         if (!session)
2854                 return -ENOMEM;
2855
2856         session->creator = pid;
2857         shost = iscsi_session_to_shost(session);
2858         ev->r.c_session_ret.host_no = shost->host_no;
2859         ev->r.c_session_ret.sid = session->sid;
2860         ISCSI_DBG_TRANS_SESSION(session,
2861                                 "Completed creating transport session\n");
2862         return 0;
2863 }
2864
2865 static int
2866 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2867 {
2868         struct iscsi_cls_conn *conn;
2869         struct iscsi_cls_session *session;
2870
2871         session = iscsi_session_lookup(ev->u.c_conn.sid);
2872         if (!session) {
2873                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2874                        ev->u.c_conn.sid);
2875                 return -EINVAL;
2876         }
2877
2878         conn = transport->create_conn(session, ev->u.c_conn.cid);
2879         if (!conn) {
2880                 iscsi_cls_session_printk(KERN_ERR, session,
2881                                          "couldn't create a new connection.");
2882                 return -ENOMEM;
2883         }
2884
2885         ev->r.c_conn_ret.sid = session->sid;
2886         ev->r.c_conn_ret.cid = conn->cid;
2887
2888         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2889         return 0;
2890 }
2891
2892 static int
2893 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2894 {
2895         struct iscsi_cls_conn *conn;
2896
2897         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2898         if (!conn)
2899                 return -EINVAL;
2900
2901         ISCSI_DBG_TRANS_CONN(conn, "Flushing cleanup during destruction\n");
2902         flush_work(&conn->cleanup_work);
2903         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2904
2905         if (transport->destroy_conn)
2906                 transport->destroy_conn(conn);
2907         return 0;
2908 }
2909
2910 static int
2911 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2912 {
2913         char *data = (char*)ev + sizeof(*ev);
2914         struct iscsi_cls_conn *conn;
2915         struct iscsi_cls_session *session;
2916         int err = 0, value = 0;
2917
2918         if (ev->u.set_param.len > PAGE_SIZE)
2919                 return -EINVAL;
2920
2921         session = iscsi_session_lookup(ev->u.set_param.sid);
2922         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2923         if (!conn || !session)
2924                 return -EINVAL;
2925
2926         switch (ev->u.set_param.param) {
2927         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2928                 sscanf(data, "%d", &value);
2929                 if (!session->recovery_tmo_sysfs_override)
2930                         session->recovery_tmo = value;
2931                 break;
2932         default:
2933                 err = transport->set_param(conn, ev->u.set_param.param,
2934                                            data, ev->u.set_param.len);
2935                 if ((conn->state == ISCSI_CONN_BOUND) ||
2936                         (conn->state == ISCSI_CONN_UP)) {
2937                         err = transport->set_param(conn, ev->u.set_param.param,
2938                                         data, ev->u.set_param.len);
2939                 } else {
2940                         return -ENOTCONN;
2941                 }
2942         }
2943
2944         return err;
2945 }
2946
2947 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2948                                struct iscsi_uevent *ev, int msg_type)
2949 {
2950         struct iscsi_endpoint *ep;
2951         struct sockaddr *dst_addr;
2952         struct Scsi_Host *shost = NULL;
2953         int non_blocking, err = 0;
2954
2955         if (!transport->ep_connect)
2956                 return -EINVAL;
2957
2958         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2959                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2960                 if (!shost) {
2961                         printk(KERN_ERR "ep connect failed. Could not find "
2962                                "host no %u\n",
2963                                ev->u.ep_connect_through_host.host_no);
2964                         return -ENODEV;
2965                 }
2966                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2967         } else
2968                 non_blocking = ev->u.ep_connect.non_blocking;
2969
2970         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2971         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2972         if (IS_ERR(ep)) {
2973                 err = PTR_ERR(ep);
2974                 goto release_host;
2975         }
2976
2977         ev->r.ep_connect_ret.handle = ep->id;
2978 release_host:
2979         if (shost)
2980                 scsi_host_put(shost);
2981         return err;
2982 }
2983
2984 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2985                                   u64 ep_handle)
2986 {
2987         struct iscsi_cls_conn *conn;
2988         struct iscsi_endpoint *ep;
2989
2990         if (!transport->ep_disconnect)
2991                 return -EINVAL;
2992
2993         ep = iscsi_lookup_endpoint(ep_handle);
2994         if (!ep)
2995                 return -EINVAL;
2996
2997         conn = ep->conn;
2998         if (!conn) {
2999                 /*
3000                  * conn was not even bound yet, so we can't get iscsi conn
3001                  * failures yet.
3002                  */
3003                 transport->ep_disconnect(ep);
3004                 goto put_ep;
3005         }
3006
3007         mutex_lock(&conn->ep_mutex);
3008         /* Check if this was a conn error and the kernel took ownership */
3009         if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3010                 ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
3011                 mutex_unlock(&conn->ep_mutex);
3012
3013                 flush_work(&conn->cleanup_work);
3014                 goto put_ep;
3015         }
3016
3017         iscsi_ep_disconnect(conn, false);
3018         mutex_unlock(&conn->ep_mutex);
3019 put_ep:
3020         iscsi_put_endpoint(ep);
3021         return 0;
3022 }
3023
3024 static int
3025 iscsi_if_transport_ep(struct iscsi_transport *transport,
3026                       struct iscsi_uevent *ev, int msg_type)
3027 {
3028         struct iscsi_endpoint *ep;
3029         int rc = 0;
3030
3031         switch (msg_type) {
3032         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3033         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3034                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
3035                 break;
3036         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3037                 if (!transport->ep_poll)
3038                         return -EINVAL;
3039
3040                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
3041                 if (!ep)
3042                         return -EINVAL;
3043
3044                 ev->r.retcode = transport->ep_poll(ep,
3045                                                    ev->u.ep_poll.timeout_ms);
3046                 iscsi_put_endpoint(ep);
3047                 break;
3048         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3049                 rc = iscsi_if_ep_disconnect(transport,
3050                                             ev->u.ep_disconnect.ep_handle);
3051                 break;
3052         }
3053         return rc;
3054 }
3055
3056 static int
3057 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3058                 struct iscsi_uevent *ev)
3059 {
3060         struct Scsi_Host *shost;
3061         struct sockaddr *dst_addr;
3062         int err;
3063
3064         if (!transport->tgt_dscvr)
3065                 return -EINVAL;
3066
3067         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3068         if (!shost) {
3069                 printk(KERN_ERR "target discovery could not find host no %u\n",
3070                        ev->u.tgt_dscvr.host_no);
3071                 return -ENODEV;
3072         }
3073
3074
3075         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3076         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3077                                    ev->u.tgt_dscvr.enable, dst_addr);
3078         scsi_host_put(shost);
3079         return err;
3080 }
3081
3082 static int
3083 iscsi_set_host_param(struct iscsi_transport *transport,
3084                      struct iscsi_uevent *ev)
3085 {
3086         char *data = (char*)ev + sizeof(*ev);
3087         struct Scsi_Host *shost;
3088         int err;
3089
3090         if (!transport->set_host_param)
3091                 return -ENOSYS;
3092
3093         if (ev->u.set_host_param.len > PAGE_SIZE)
3094                 return -EINVAL;
3095
3096         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3097         if (!shost) {
3098                 printk(KERN_ERR "set_host_param could not find host no %u\n",
3099                        ev->u.set_host_param.host_no);
3100                 return -ENODEV;
3101         }
3102
3103         err = transport->set_host_param(shost, ev->u.set_host_param.param,
3104                                         data, ev->u.set_host_param.len);
3105         scsi_host_put(shost);
3106         return err;
3107 }
3108
3109 static int
3110 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3111 {
3112         struct Scsi_Host *shost;
3113         struct iscsi_path *params;
3114         int err;
3115
3116         if (!transport->set_path)
3117                 return -ENOSYS;
3118
3119         shost = scsi_host_lookup(ev->u.set_path.host_no);
3120         if (!shost) {
3121                 printk(KERN_ERR "set path could not find host no %u\n",
3122                        ev->u.set_path.host_no);
3123                 return -ENODEV;
3124         }
3125
3126         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3127         err = transport->set_path(shost, params);
3128
3129         scsi_host_put(shost);
3130         return err;
3131 }
3132
3133 static int iscsi_session_has_conns(int sid)
3134 {
3135         struct iscsi_cls_conn *conn;
3136         unsigned long flags;
3137         int found = 0;
3138
3139         spin_lock_irqsave(&connlock, flags);
3140         list_for_each_entry(conn, &connlist, conn_list) {
3141                 if (iscsi_conn_get_sid(conn) == sid) {
3142                         found = 1;
3143                         break;
3144                 }
3145         }
3146         spin_unlock_irqrestore(&connlock, flags);
3147
3148         return found;
3149 }
3150
3151 static int
3152 iscsi_set_iface_params(struct iscsi_transport *transport,
3153                        struct iscsi_uevent *ev, uint32_t len)
3154 {
3155         char *data = (char *)ev + sizeof(*ev);
3156         struct Scsi_Host *shost;
3157         int err;
3158
3159         if (!transport->set_iface_param)
3160                 return -ENOSYS;
3161
3162         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3163         if (!shost) {
3164                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
3165                        ev->u.set_iface_params.host_no);
3166                 return -ENODEV;
3167         }
3168
3169         err = transport->set_iface_param(shost, data, len);
3170         scsi_host_put(shost);
3171         return err;
3172 }
3173
3174 static int
3175 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3176 {
3177         struct Scsi_Host *shost;
3178         struct sockaddr *dst_addr;
3179         int err;
3180
3181         if (!transport->send_ping)
3182                 return -ENOSYS;
3183
3184         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3185         if (!shost) {
3186                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3187                        ev->u.iscsi_ping.host_no);
3188                 return -ENODEV;
3189         }
3190
3191         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3192         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3193                                    ev->u.iscsi_ping.iface_type,
3194                                    ev->u.iscsi_ping.payload_size,
3195                                    ev->u.iscsi_ping.pid,
3196                                    dst_addr);
3197         scsi_host_put(shost);
3198         return err;
3199 }
3200
3201 static int
3202 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3203 {
3204         struct iscsi_uevent *ev = nlmsg_data(nlh);
3205         struct Scsi_Host *shost = NULL;
3206         struct iscsi_chap_rec *chap_rec;
3207         struct iscsi_internal *priv;
3208         struct sk_buff *skbchap;
3209         struct nlmsghdr *nlhchap;
3210         struct iscsi_uevent *evchap;
3211         uint32_t chap_buf_size;
3212         int len, err = 0;
3213         char *buf;
3214
3215         if (!transport->get_chap)
3216                 return -EINVAL;
3217
3218         priv = iscsi_if_transport_lookup(transport);
3219         if (!priv)
3220                 return -EINVAL;
3221
3222         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3223         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3224
3225         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3226         if (!shost) {
3227                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3228                        __func__, ev->u.get_chap.host_no);
3229                 return -ENODEV;
3230         }
3231
3232         do {
3233                 int actual_size;
3234
3235                 skbchap = alloc_skb(len, GFP_KERNEL);
3236                 if (!skbchap) {
3237                         printk(KERN_ERR "can not deliver chap: OOM\n");
3238                         err = -ENOMEM;
3239                         goto exit_get_chap;
3240                 }
3241
3242                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3243                                       (len - sizeof(*nlhchap)), 0);
3244                 evchap = nlmsg_data(nlhchap);
3245                 memset(evchap, 0, sizeof(*evchap));
3246                 evchap->transport_handle = iscsi_handle(transport);
3247                 evchap->type = nlh->nlmsg_type;
3248                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3249                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3250                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3251                 buf = (char *)evchap + sizeof(*evchap);
3252                 memset(buf, 0, chap_buf_size);
3253
3254                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3255                                     &evchap->u.get_chap.num_entries, buf);
3256
3257                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3258                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3259                 nlhchap->nlmsg_len = actual_size;
3260
3261                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3262                                           GFP_KERNEL);
3263         } while (err < 0 && err != -ECONNREFUSED);
3264
3265 exit_get_chap:
3266         scsi_host_put(shost);
3267         return err;
3268 }
3269
3270 static int iscsi_set_chap(struct iscsi_transport *transport,
3271                           struct iscsi_uevent *ev, uint32_t len)
3272 {
3273         char *data = (char *)ev + sizeof(*ev);
3274         struct Scsi_Host *shost;
3275         int err = 0;
3276
3277         if (!transport->set_chap)
3278                 return -ENOSYS;
3279
3280         shost = scsi_host_lookup(ev->u.set_path.host_no);
3281         if (!shost) {
3282                 pr_err("%s could not find host no %u\n",
3283                        __func__, ev->u.set_path.host_no);
3284                 return -ENODEV;
3285         }
3286
3287         err = transport->set_chap(shost, data, len);
3288         scsi_host_put(shost);
3289         return err;
3290 }
3291
3292 static int iscsi_delete_chap(struct iscsi_transport *transport,
3293                              struct iscsi_uevent *ev)
3294 {
3295         struct Scsi_Host *shost;
3296         int err = 0;
3297
3298         if (!transport->delete_chap)
3299                 return -ENOSYS;
3300
3301         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3302         if (!shost) {
3303                 printk(KERN_ERR "%s could not find host no %u\n",
3304                        __func__, ev->u.delete_chap.host_no);
3305                 return -ENODEV;
3306         }
3307
3308         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3309         scsi_host_put(shost);
3310         return err;
3311 }
3312
3313 static const struct {
3314         enum iscsi_discovery_parent_type value;
3315         char                            *name;
3316 } iscsi_discovery_parent_names[] = {
3317         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3318         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3319         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3320 };
3321
3322 char *iscsi_get_discovery_parent_name(int parent_type)
3323 {
3324         int i;
3325         char *state = "Unknown!";
3326
3327         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3328                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3329                         state = iscsi_discovery_parent_names[i].name;
3330                         break;
3331                 }
3332         }
3333         return state;
3334 }
3335 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3336
3337 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3338                                      struct iscsi_uevent *ev, uint32_t len)
3339 {
3340         char *data = (char *)ev + sizeof(*ev);
3341         struct Scsi_Host *shost;
3342         struct iscsi_bus_flash_session *fnode_sess;
3343         struct iscsi_bus_flash_conn *fnode_conn;
3344         struct device *dev;
3345         uint32_t idx;
3346         int err = 0;
3347
3348         if (!transport->set_flashnode_param) {
3349                 err = -ENOSYS;
3350                 goto exit_set_fnode;
3351         }
3352
3353         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3354         if (!shost) {
3355                 pr_err("%s could not find host no %u\n",
3356                        __func__, ev->u.set_flashnode.host_no);
3357                 err = -ENODEV;
3358                 goto exit_set_fnode;
3359         }
3360
3361         idx = ev->u.set_flashnode.flashnode_idx;
3362         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3363         if (!fnode_sess) {
3364                 pr_err("%s could not find flashnode %u for host no %u\n",
3365                        __func__, idx, ev->u.set_flashnode.host_no);
3366                 err = -ENODEV;
3367                 goto put_host;
3368         }
3369
3370         dev = iscsi_find_flashnode_conn(fnode_sess);
3371         if (!dev) {
3372                 err = -ENODEV;
3373                 goto put_sess;
3374         }
3375
3376         fnode_conn = iscsi_dev_to_flash_conn(dev);
3377         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3378         put_device(dev);
3379
3380 put_sess:
3381         put_device(&fnode_sess->dev);
3382
3383 put_host:
3384         scsi_host_put(shost);
3385
3386 exit_set_fnode:
3387         return err;
3388 }
3389
3390 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3391                                struct iscsi_uevent *ev, uint32_t len)
3392 {
3393         char *data = (char *)ev + sizeof(*ev);
3394         struct Scsi_Host *shost;
3395         int index;
3396         int err = 0;
3397
3398         if (!transport->new_flashnode) {
3399                 err = -ENOSYS;
3400                 goto exit_new_fnode;
3401         }
3402
3403         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3404         if (!shost) {
3405                 pr_err("%s could not find host no %u\n",
3406                        __func__, ev->u.new_flashnode.host_no);
3407                 err = -ENODEV;
3408                 goto put_host;
3409         }
3410
3411         index = transport->new_flashnode(shost, data, len);
3412
3413         if (index >= 0)
3414                 ev->r.new_flashnode_ret.flashnode_idx = index;
3415         else
3416                 err = -EIO;
3417
3418 put_host:
3419         scsi_host_put(shost);
3420
3421 exit_new_fnode:
3422         return err;
3423 }
3424
3425 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3426                                struct iscsi_uevent *ev)
3427 {
3428         struct Scsi_Host *shost;
3429         struct iscsi_bus_flash_session *fnode_sess;
3430         uint32_t idx;
3431         int err = 0;
3432
3433         if (!transport->del_flashnode) {
3434                 err = -ENOSYS;
3435                 goto exit_del_fnode;
3436         }
3437
3438         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3439         if (!shost) {
3440                 pr_err("%s could not find host no %u\n",
3441                        __func__, ev->u.del_flashnode.host_no);
3442                 err = -ENODEV;
3443                 goto put_host;
3444         }
3445
3446         idx = ev->u.del_flashnode.flashnode_idx;
3447         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3448         if (!fnode_sess) {
3449                 pr_err("%s could not find flashnode %u for host no %u\n",
3450                        __func__, idx, ev->u.del_flashnode.host_no);
3451                 err = -ENODEV;
3452                 goto put_host;
3453         }
3454
3455         err = transport->del_flashnode(fnode_sess);
3456         put_device(&fnode_sess->dev);
3457
3458 put_host:
3459         scsi_host_put(shost);
3460
3461 exit_del_fnode:
3462         return err;
3463 }
3464
3465 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3466                                  struct iscsi_uevent *ev)
3467 {
3468         struct Scsi_Host *shost;
3469         struct iscsi_bus_flash_session *fnode_sess;
3470         struct iscsi_bus_flash_conn *fnode_conn;
3471         struct device *dev;
3472         uint32_t idx;
3473         int err = 0;
3474
3475         if (!transport->login_flashnode) {
3476                 err = -ENOSYS;
3477                 goto exit_login_fnode;
3478         }
3479
3480         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3481         if (!shost) {
3482                 pr_err("%s could not find host no %u\n",
3483                        __func__, ev->u.login_flashnode.host_no);
3484                 err = -ENODEV;
3485                 goto put_host;
3486         }
3487
3488         idx = ev->u.login_flashnode.flashnode_idx;
3489         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3490         if (!fnode_sess) {
3491                 pr_err("%s could not find flashnode %u for host no %u\n",
3492                        __func__, idx, ev->u.login_flashnode.host_no);
3493                 err = -ENODEV;
3494                 goto put_host;
3495         }
3496
3497         dev = iscsi_find_flashnode_conn(fnode_sess);
3498         if (!dev) {
3499                 err = -ENODEV;
3500                 goto put_sess;
3501         }
3502
3503         fnode_conn = iscsi_dev_to_flash_conn(dev);
3504         err = transport->login_flashnode(fnode_sess, fnode_conn);
3505         put_device(dev);
3506
3507 put_sess:
3508         put_device(&fnode_sess->dev);
3509
3510 put_host:
3511         scsi_host_put(shost);
3512
3513 exit_login_fnode:
3514         return err;
3515 }
3516
3517 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3518                                   struct iscsi_uevent *ev)
3519 {
3520         struct Scsi_Host *shost;
3521         struct iscsi_bus_flash_session *fnode_sess;
3522         struct iscsi_bus_flash_conn *fnode_conn;
3523         struct device *dev;
3524         uint32_t idx;
3525         int err = 0;
3526
3527         if (!transport->logout_flashnode) {
3528                 err = -ENOSYS;
3529                 goto exit_logout_fnode;
3530         }
3531
3532         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3533         if (!shost) {
3534                 pr_err("%s could not find host no %u\n",
3535                        __func__, ev->u.logout_flashnode.host_no);
3536                 err = -ENODEV;
3537                 goto put_host;
3538         }
3539
3540         idx = ev->u.logout_flashnode.flashnode_idx;
3541         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3542         if (!fnode_sess) {
3543                 pr_err("%s could not find flashnode %u for host no %u\n",
3544                        __func__, idx, ev->u.logout_flashnode.host_no);
3545                 err = -ENODEV;
3546                 goto put_host;
3547         }
3548
3549         dev = iscsi_find_flashnode_conn(fnode_sess);
3550         if (!dev) {
3551                 err = -ENODEV;
3552                 goto put_sess;
3553         }
3554
3555         fnode_conn = iscsi_dev_to_flash_conn(dev);
3556
3557         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3558         put_device(dev);
3559
3560 put_sess:
3561         put_device(&fnode_sess->dev);
3562
3563 put_host:
3564         scsi_host_put(shost);
3565
3566 exit_logout_fnode:
3567         return err;
3568 }
3569
3570 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3571                                       struct iscsi_uevent *ev)
3572 {
3573         struct Scsi_Host *shost;
3574         struct iscsi_cls_session *session;
3575         int err = 0;
3576
3577         if (!transport->logout_flashnode_sid) {
3578                 err = -ENOSYS;
3579                 goto exit_logout_sid;
3580         }
3581
3582         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3583         if (!shost) {
3584                 pr_err("%s could not find host no %u\n",
3585                        __func__, ev->u.logout_flashnode.host_no);
3586                 err = -ENODEV;
3587                 goto put_host;
3588         }
3589
3590         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3591         if (!session) {
3592                 pr_err("%s could not find session id %u\n",
3593                        __func__, ev->u.logout_flashnode_sid.sid);
3594                 err = -EINVAL;
3595                 goto put_host;
3596         }
3597
3598         err = transport->logout_flashnode_sid(session);
3599
3600 put_host:
3601         scsi_host_put(shost);
3602
3603 exit_logout_sid:
3604         return err;
3605 }
3606
3607 static int
3608 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3609 {
3610         struct iscsi_uevent *ev = nlmsg_data(nlh);
3611         struct Scsi_Host *shost = NULL;
3612         struct iscsi_internal *priv;
3613         struct sk_buff *skbhost_stats;
3614         struct nlmsghdr *nlhhost_stats;
3615         struct iscsi_uevent *evhost_stats;
3616         int host_stats_size = 0;
3617         int len, err = 0;
3618         char *buf;
3619
3620         if (!transport->get_host_stats)
3621                 return -ENOSYS;
3622
3623         priv = iscsi_if_transport_lookup(transport);
3624         if (!priv)
3625                 return -EINVAL;
3626
3627         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3628         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3629
3630         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3631         if (!shost) {
3632                 pr_err("%s: failed. Could not find host no %u\n",
3633                        __func__, ev->u.get_host_stats.host_no);
3634                 return -ENODEV;
3635         }
3636
3637         do {
3638                 int actual_size;
3639
3640                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3641                 if (!skbhost_stats) {
3642                         pr_err("cannot deliver host stats: OOM\n");
3643                         err = -ENOMEM;
3644                         goto exit_host_stats;
3645                 }
3646
3647                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3648                                       (len - sizeof(*nlhhost_stats)), 0);
3649                 evhost_stats = nlmsg_data(nlhhost_stats);
3650                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3651                 evhost_stats->transport_handle = iscsi_handle(transport);
3652                 evhost_stats->type = nlh->nlmsg_type;
3653                 evhost_stats->u.get_host_stats.host_no =
3654                                         ev->u.get_host_stats.host_no;
3655                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3656                 memset(buf, 0, host_stats_size);
3657
3658                 err = transport->get_host_stats(shost, buf, host_stats_size);
3659                 if (err) {
3660                         kfree_skb(skbhost_stats);
3661                         goto exit_host_stats;
3662                 }
3663
3664                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3665                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3666                 nlhhost_stats->nlmsg_len = actual_size;
3667
3668                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3669                                           GFP_KERNEL);
3670         } while (err < 0 && err != -ECONNREFUSED);
3671
3672 exit_host_stats:
3673         scsi_host_put(shost);
3674         return err;
3675 }
3676
3677 static int iscsi_if_transport_conn(struct iscsi_transport *transport,
3678                                    struct nlmsghdr *nlh)
3679 {
3680         struct iscsi_uevent *ev = nlmsg_data(nlh);
3681         struct iscsi_cls_session *session;
3682         struct iscsi_cls_conn *conn = NULL;
3683         struct iscsi_endpoint *ep;
3684         uint32_t pdu_len;
3685         int err = 0;
3686
3687         switch (nlh->nlmsg_type) {
3688         case ISCSI_UEVENT_CREATE_CONN:
3689                 return iscsi_if_create_conn(transport, ev);
3690         case ISCSI_UEVENT_DESTROY_CONN:
3691                 return iscsi_if_destroy_conn(transport, ev);
3692         case ISCSI_UEVENT_STOP_CONN:
3693                 return iscsi_if_stop_conn(transport, ev);
3694         }
3695
3696         /*
3697          * The following cmds need to be run under the ep_mutex so in kernel
3698          * conn cleanup (ep_disconnect + unbind and conn) is not done while
3699          * these are running. They also must not run if we have just run a conn
3700          * cleanup because they would set the state in a way that might allow
3701          * IO or send IO themselves.
3702          */
3703         switch (nlh->nlmsg_type) {
3704         case ISCSI_UEVENT_START_CONN:
3705                 conn = iscsi_conn_lookup(ev->u.start_conn.sid,
3706                                          ev->u.start_conn.cid);
3707                 break;
3708         case ISCSI_UEVENT_BIND_CONN:
3709                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3710                 break;
3711         case ISCSI_UEVENT_SEND_PDU:
3712                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3713                 break;
3714         }
3715
3716         if (!conn)
3717                 return -EINVAL;
3718
3719         mutex_lock(&conn->ep_mutex);
3720         if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3721                 mutex_unlock(&conn->ep_mutex);
3722                 ev->r.retcode = -ENOTCONN;
3723                 return 0;
3724         }
3725
3726         switch (nlh->nlmsg_type) {
3727         case ISCSI_UEVENT_BIND_CONN:
3728                 if (conn->ep) {
3729                         /*
3730                          * For offload boot support where iscsid is restarted
3731                          * during the pivot root stage, the ep will be intact
3732                          * here when the new iscsid instance starts up and
3733                          * reconnects.
3734                          */
3735                         iscsi_ep_disconnect(conn, true);
3736                 }
3737
3738                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3739                 if (!session) {
3740                         err = -EINVAL;
3741                         break;
3742                 }
3743
3744                 ev->r.retcode = transport->bind_conn(session, conn,
3745                                                 ev->u.b_conn.transport_eph,
3746                                                 ev->u.b_conn.is_leading);
3747                 if (!ev->r.retcode)
3748                         conn->state = ISCSI_CONN_BOUND;
3749
3750                 if (ev->r.retcode || !transport->ep_connect)
3751                         break;
3752
3753                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3754                 if (ep) {
3755                         ep->conn = conn;
3756                         conn->ep = ep;
3757                         iscsi_put_endpoint(ep);
3758                 } else {
3759                         err = -ENOTCONN;
3760                         iscsi_cls_conn_printk(KERN_ERR, conn,
3761                                               "Could not set ep conn binding\n");
3762                 }
3763                 break;
3764         case ISCSI_UEVENT_START_CONN:
3765                 ev->r.retcode = transport->start_conn(conn);
3766                 if (!ev->r.retcode)
3767                         conn->state = ISCSI_CONN_UP;
3768                 break;
3769         case ISCSI_UEVENT_SEND_PDU:
3770                 pdu_len = nlh->nlmsg_len - sizeof(*nlh) - sizeof(*ev);
3771
3772                 if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3773                     (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3774                         err = -EINVAL;
3775                         break;
3776                 }
3777
3778                 ev->r.retcode = transport->send_pdu(conn,
3779                                 (struct iscsi_hdr *)((char *)ev + sizeof(*ev)),
3780                                 (char *)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3781                                 ev->u.send_pdu.data_size);
3782                 break;
3783         default:
3784                 err = -ENOSYS;
3785         }
3786
3787         mutex_unlock(&conn->ep_mutex);
3788         return err;
3789 }
3790
3791 static int
3792 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3793 {
3794         int err = 0;
3795         u32 portid;
3796         struct iscsi_uevent *ev = nlmsg_data(nlh);
3797         struct iscsi_transport *transport = NULL;
3798         struct iscsi_internal *priv;
3799         struct iscsi_cls_session *session;
3800         struct iscsi_endpoint *ep = NULL;
3801
3802         if (!netlink_capable(skb, CAP_SYS_ADMIN))
3803                 return -EPERM;
3804
3805         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3806                 *group = ISCSI_NL_GRP_UIP;
3807         else
3808                 *group = ISCSI_NL_GRP_ISCSID;
3809
3810         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3811         if (!priv)
3812                 return -EINVAL;
3813         transport = priv->iscsi_transport;
3814
3815         if (!try_module_get(transport->owner))
3816                 return -EINVAL;
3817
3818         portid = NETLINK_CB(skb).portid;
3819
3820         switch (nlh->nlmsg_type) {
3821         case ISCSI_UEVENT_CREATE_SESSION:
3822                 err = iscsi_if_create_session(priv, ep, ev,
3823                                               portid,
3824                                               ev->u.c_session.initial_cmdsn,
3825                                               ev->u.c_session.cmds_max,
3826                                               ev->u.c_session.queue_depth);
3827                 break;
3828         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3829                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3830                 if (!ep) {
3831                         err = -EINVAL;
3832                         break;
3833                 }
3834
3835                 err = iscsi_if_create_session(priv, ep, ev,
3836                                         portid,
3837                                         ev->u.c_bound_session.initial_cmdsn,
3838                                         ev->u.c_bound_session.cmds_max,
3839                                         ev->u.c_bound_session.queue_depth);
3840                 iscsi_put_endpoint(ep);
3841                 break;
3842         case ISCSI_UEVENT_DESTROY_SESSION:
3843                 session = iscsi_session_lookup(ev->u.d_session.sid);
3844                 if (!session)
3845                         err = -EINVAL;
3846                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3847                         err = -EBUSY;
3848                 else
3849                         transport->destroy_session(session);
3850                 break;
3851         case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3852                 session = iscsi_session_lookup(ev->u.d_session.sid);
3853                 if (!session)
3854                         err = -EINVAL;
3855                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3856                         err = -EBUSY;
3857                 else {
3858                         unsigned long flags;
3859
3860                         /* Prevent this session from being found again */
3861                         spin_lock_irqsave(&sesslock, flags);
3862                         list_del_init(&session->sess_list);
3863                         spin_unlock_irqrestore(&sesslock, flags);
3864
3865                         queue_work(system_unbound_wq, &session->destroy_work);
3866                 }
3867                 break;
3868         case ISCSI_UEVENT_UNBIND_SESSION:
3869                 session = iscsi_session_lookup(ev->u.d_session.sid);
3870                 if (session)
3871                         scsi_queue_work(iscsi_session_to_shost(session),
3872                                         &session->unbind_work);
3873                 else
3874                         err = -EINVAL;
3875                 break;
3876         case ISCSI_UEVENT_SET_PARAM:
3877                 err = iscsi_set_param(transport, ev);
3878                 break;
3879         case ISCSI_UEVENT_CREATE_CONN:
3880         case ISCSI_UEVENT_DESTROY_CONN:
3881         case ISCSI_UEVENT_STOP_CONN:
3882         case ISCSI_UEVENT_START_CONN:
3883         case ISCSI_UEVENT_BIND_CONN:
3884         case ISCSI_UEVENT_SEND_PDU:
3885                 err = iscsi_if_transport_conn(transport, nlh);
3886                 break;
3887         case ISCSI_UEVENT_GET_STATS:
3888                 err = iscsi_if_get_stats(transport, nlh);
3889                 break;
3890         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3891         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3892         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3893         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3894                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3895                 break;
3896         case ISCSI_UEVENT_TGT_DSCVR:
3897                 err = iscsi_tgt_dscvr(transport, ev);
3898                 break;
3899         case ISCSI_UEVENT_SET_HOST_PARAM:
3900                 err = iscsi_set_host_param(transport, ev);
3901                 break;
3902         case ISCSI_UEVENT_PATH_UPDATE:
3903                 err = iscsi_set_path(transport, ev);
3904                 break;
3905         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3906                 err = iscsi_set_iface_params(transport, ev,
3907                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3908                 break;
3909         case ISCSI_UEVENT_PING:
3910                 err = iscsi_send_ping(transport, ev);
3911                 break;
3912         case ISCSI_UEVENT_GET_CHAP:
3913                 err = iscsi_get_chap(transport, nlh);
3914                 break;
3915         case ISCSI_UEVENT_DELETE_CHAP:
3916                 err = iscsi_delete_chap(transport, ev);
3917                 break;
3918         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3919                 err = iscsi_set_flashnode_param(transport, ev,
3920                                                 nlmsg_attrlen(nlh,
3921                                                               sizeof(*ev)));
3922                 break;
3923         case ISCSI_UEVENT_NEW_FLASHNODE:
3924                 err = iscsi_new_flashnode(transport, ev,
3925                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3926                 break;
3927         case ISCSI_UEVENT_DEL_FLASHNODE:
3928                 err = iscsi_del_flashnode(transport, ev);
3929                 break;
3930         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3931                 err = iscsi_login_flashnode(transport, ev);
3932                 break;
3933         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3934                 err = iscsi_logout_flashnode(transport, ev);
3935                 break;
3936         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3937                 err = iscsi_logout_flashnode_sid(transport, ev);
3938                 break;
3939         case ISCSI_UEVENT_SET_CHAP:
3940                 err = iscsi_set_chap(transport, ev,
3941                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3942                 break;
3943         case ISCSI_UEVENT_GET_HOST_STATS:
3944                 err = iscsi_get_host_stats(transport, nlh);
3945                 break;
3946         default:
3947                 err = -ENOSYS;
3948                 break;
3949         }
3950
3951         module_put(transport->owner);
3952         return err;
3953 }
3954
3955 /*
3956  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3957  * Malformed skbs with wrong lengths or invalid creds are not processed.
3958  */
3959 static void
3960 iscsi_if_rx(struct sk_buff *skb)
3961 {
3962         u32 portid = NETLINK_CB(skb).portid;
3963
3964         mutex_lock(&rx_queue_mutex);
3965         while (skb->len >= NLMSG_HDRLEN) {
3966                 int err;
3967                 uint32_t rlen;
3968                 struct nlmsghdr *nlh;
3969                 struct iscsi_uevent *ev;
3970                 uint32_t group;
3971                 int retries = ISCSI_SEND_MAX_ALLOWED;
3972
3973                 nlh = nlmsg_hdr(skb);
3974                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3975                     skb->len < nlh->nlmsg_len) {
3976                         break;
3977                 }
3978
3979                 ev = nlmsg_data(nlh);
3980                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3981                 if (rlen > skb->len)
3982                         rlen = skb->len;
3983
3984                 err = iscsi_if_recv_msg(skb, nlh, &group);
3985                 if (err) {
3986                         ev->type = ISCSI_KEVENT_IF_ERROR;
3987                         ev->iferror = err;
3988                 }
3989                 do {
3990                         /*
3991                          * special case for GET_STATS:
3992                          * on success - sending reply and stats from
3993                          * inside of if_recv_msg(),
3994                          * on error - fall through.
3995                          */
3996                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3997                                 break;
3998                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3999                                 break;
4000                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
4001                                                   ev, sizeof(*ev));
4002                         if (err == -EAGAIN && --retries < 0) {
4003                                 printk(KERN_WARNING "Send reply failed, error %d\n", err);
4004                                 break;
4005                         }
4006                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
4007                 skb_pull(skb, rlen);
4008         }
4009         mutex_unlock(&rx_queue_mutex);
4010 }
4011
4012 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
4013 struct device_attribute dev_attr_##_prefix##_##_name =  \
4014         __ATTR(_name,_mode,_show,_store)
4015
4016 /*
4017  * iSCSI connection attrs
4018  */
4019 #define iscsi_conn_attr_show(param)                                     \
4020 static ssize_t                                                          \
4021 show_conn_param_##param(struct device *dev,                             \
4022                         struct device_attribute *attr, char *buf)       \
4023 {                                                                       \
4024         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4025         struct iscsi_transport *t = conn->transport;                    \
4026         return t->get_conn_param(conn, param, buf);                     \
4027 }
4028
4029 #define iscsi_conn_attr(field, param)                                   \
4030         iscsi_conn_attr_show(param)                                     \
4031 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
4032                         NULL);
4033
4034 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
4035 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
4036 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
4037 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
4038 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
4039 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
4040 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
4041 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
4042 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
4043 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
4044 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
4045 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
4046 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
4047 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
4048 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
4049 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
4050 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
4051 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
4052 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
4053 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
4054 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
4055 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
4056 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
4057 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
4058 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
4059 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
4060 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
4061 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
4062
4063 static const char *const connection_state_names[] = {
4064         [ISCSI_CONN_UP] = "up",
4065         [ISCSI_CONN_DOWN] = "down",
4066         [ISCSI_CONN_FAILED] = "failed",
4067         [ISCSI_CONN_BOUND] = "bound"
4068 };
4069
4070 static ssize_t show_conn_state(struct device *dev,
4071                                struct device_attribute *attr, char *buf)
4072 {
4073         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
4074         const char *state = "unknown";
4075
4076         if (conn->state >= 0 &&
4077             conn->state < ARRAY_SIZE(connection_state_names))
4078                 state = connection_state_names[conn->state];
4079
4080         return sysfs_emit(buf, "%s\n", state);
4081 }
4082 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
4083                         NULL);
4084
4085 #define iscsi_conn_ep_attr_show(param)                                  \
4086 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
4087                                           struct device_attribute *attr,\
4088                                           char *buf)                    \
4089 {                                                                       \
4090         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4091         struct iscsi_transport *t = conn->transport;                    \
4092         struct iscsi_endpoint *ep;                                      \
4093         ssize_t rc;                                                     \
4094                                                                         \
4095         /*                                                              \
4096          * Need to make sure ep_disconnect does not free the LLD's      \
4097          * interconnect resources while we are trying to read them.     \
4098          */                                                             \
4099         mutex_lock(&conn->ep_mutex);                                    \
4100         ep = conn->ep;                                                  \
4101         if (!ep && t->ep_connect) {                                     \
4102                 mutex_unlock(&conn->ep_mutex);                          \
4103                 return -ENOTCONN;                                       \
4104         }                                                               \
4105                                                                         \
4106         if (ep)                                                         \
4107                 rc = t->get_ep_param(ep, param, buf);                   \
4108         else                                                            \
4109                 rc = t->get_conn_param(conn, param, buf);               \
4110         mutex_unlock(&conn->ep_mutex);                                  \
4111         return rc;                                                      \
4112 }
4113
4114 #define iscsi_conn_ep_attr(field, param)                                \
4115         iscsi_conn_ep_attr_show(param)                                  \
4116 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
4117                         show_conn_ep_param_##param, NULL);
4118
4119 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4120 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4121
4122 static struct attribute *iscsi_conn_attrs[] = {
4123         &dev_attr_conn_max_recv_dlength.attr,
4124         &dev_attr_conn_max_xmit_dlength.attr,
4125         &dev_attr_conn_header_digest.attr,
4126         &dev_attr_conn_data_digest.attr,
4127         &dev_attr_conn_ifmarker.attr,
4128         &dev_attr_conn_ofmarker.attr,
4129         &dev_attr_conn_address.attr,
4130         &dev_attr_conn_port.attr,
4131         &dev_attr_conn_exp_statsn.attr,
4132         &dev_attr_conn_persistent_address.attr,
4133         &dev_attr_conn_persistent_port.attr,
4134         &dev_attr_conn_ping_tmo.attr,
4135         &dev_attr_conn_recv_tmo.attr,
4136         &dev_attr_conn_local_port.attr,
4137         &dev_attr_conn_statsn.attr,
4138         &dev_attr_conn_keepalive_tmo.attr,
4139         &dev_attr_conn_max_segment_size.attr,
4140         &dev_attr_conn_tcp_timestamp_stat.attr,
4141         &dev_attr_conn_tcp_wsf_disable.attr,
4142         &dev_attr_conn_tcp_nagle_disable.attr,
4143         &dev_attr_conn_tcp_timer_scale.attr,
4144         &dev_attr_conn_tcp_timestamp_enable.attr,
4145         &dev_attr_conn_fragment_disable.attr,
4146         &dev_attr_conn_ipv4_tos.attr,
4147         &dev_attr_conn_ipv6_traffic_class.attr,
4148         &dev_attr_conn_ipv6_flow_label.attr,
4149         &dev_attr_conn_is_fw_assigned_ipv6.attr,
4150         &dev_attr_conn_tcp_xmit_wsf.attr,
4151         &dev_attr_conn_tcp_recv_wsf.attr,
4152         &dev_attr_conn_local_ipaddr.attr,
4153         &dev_attr_conn_state.attr,
4154         NULL,
4155 };
4156
4157 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4158                                          struct attribute *attr, int i)
4159 {
4160         struct device *cdev = container_of(kobj, struct device, kobj);
4161         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4162         struct iscsi_transport *t = conn->transport;
4163         int param;
4164
4165         if (attr == &dev_attr_conn_max_recv_dlength.attr)
4166                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4167         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4168                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4169         else if (attr == &dev_attr_conn_header_digest.attr)
4170                 param = ISCSI_PARAM_HDRDGST_EN;
4171         else if (attr == &dev_attr_conn_data_digest.attr)
4172                 param = ISCSI_PARAM_DATADGST_EN;
4173         else if (attr == &dev_attr_conn_ifmarker.attr)
4174                 param = ISCSI_PARAM_IFMARKER_EN;
4175         else if (attr == &dev_attr_conn_ofmarker.attr)
4176                 param = ISCSI_PARAM_OFMARKER_EN;
4177         else if (attr == &dev_attr_conn_address.attr)
4178                 param = ISCSI_PARAM_CONN_ADDRESS;
4179         else if (attr == &dev_attr_conn_port.attr)
4180                 param = ISCSI_PARAM_CONN_PORT;
4181         else if (attr == &dev_attr_conn_exp_statsn.attr)
4182                 param = ISCSI_PARAM_EXP_STATSN;
4183         else if (attr == &dev_attr_conn_persistent_address.attr)
4184                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4185         else if (attr == &dev_attr_conn_persistent_port.attr)
4186                 param = ISCSI_PARAM_PERSISTENT_PORT;
4187         else if (attr == &dev_attr_conn_ping_tmo.attr)
4188                 param = ISCSI_PARAM_PING_TMO;
4189         else if (attr == &dev_attr_conn_recv_tmo.attr)
4190                 param = ISCSI_PARAM_RECV_TMO;
4191         else if (attr == &dev_attr_conn_local_port.attr)
4192                 param = ISCSI_PARAM_LOCAL_PORT;
4193         else if (attr == &dev_attr_conn_statsn.attr)
4194                 param = ISCSI_PARAM_STATSN;
4195         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4196                 param = ISCSI_PARAM_KEEPALIVE_TMO;
4197         else if (attr == &dev_attr_conn_max_segment_size.attr)
4198                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4199         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4200                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4201         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4202                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
4203         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4204                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4205         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4206                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
4207         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4208                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4209         else if (attr == &dev_attr_conn_fragment_disable.attr)
4210                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4211         else if (attr == &dev_attr_conn_ipv4_tos.attr)
4212                 param = ISCSI_PARAM_IPV4_TOS;
4213         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4214                 param = ISCSI_PARAM_IPV6_TC;
4215         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4216                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4217         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4218                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4219         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4220                 param = ISCSI_PARAM_TCP_XMIT_WSF;
4221         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4222                 param = ISCSI_PARAM_TCP_RECV_WSF;
4223         else if (attr == &dev_attr_conn_local_ipaddr.attr)
4224                 param = ISCSI_PARAM_LOCAL_IPADDR;
4225         else if (attr == &dev_attr_conn_state.attr)
4226                 return S_IRUGO;
4227         else {
4228                 WARN_ONCE(1, "Invalid conn attr");
4229                 return 0;
4230         }
4231
4232         return t->attr_is_visible(ISCSI_PARAM, param);
4233 }
4234
4235 static struct attribute_group iscsi_conn_group = {
4236         .attrs = iscsi_conn_attrs,
4237         .is_visible = iscsi_conn_attr_is_visible,
4238 };
4239
4240 /*
4241  * iSCSI session attrs
4242  */
4243 #define iscsi_session_attr_show(param, perm)                            \
4244 static ssize_t                                                          \
4245 show_session_param_##param(struct device *dev,                          \
4246                            struct device_attribute *attr, char *buf)    \
4247 {                                                                       \
4248         struct iscsi_cls_session *session =                             \
4249                 iscsi_dev_to_session(dev->parent);                      \
4250         struct iscsi_transport *t = session->transport;                 \
4251                                                                         \
4252         if (perm && !capable(CAP_SYS_ADMIN))                            \
4253                 return -EACCES;                                         \
4254         return t->get_session_param(session, param, buf);               \
4255 }
4256
4257 #define iscsi_session_attr(field, param, perm)                          \
4258         iscsi_session_attr_show(param, perm)                            \
4259 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4260                         NULL);
4261 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4262 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4263 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4264 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4265 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4266 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4267 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4268 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4269 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4270 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4271 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4272 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4273 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4274 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4275 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4276 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4277 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4278 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4279 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4280 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4281 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4282 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4283 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4284 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4285 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4286 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4287 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4288 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4289 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4290 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4291 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4292 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4293 iscsi_session_attr(discovery_auth_optional,
4294                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4295 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4296 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4297 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4298 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4299 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4300 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4301 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4302
4303 static ssize_t
4304 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4305                         char *buf)
4306 {
4307         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4308         return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4309 }
4310 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4311                         NULL);
4312 static ssize_t
4313 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4314                         char *buf)
4315 {
4316         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4317         return sysfs_emit(buf, "%d\n", session->creator);
4318 }
4319 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4320                         NULL);
4321 static ssize_t
4322 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4323                             char *buf)
4324 {
4325         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4326         return sysfs_emit(buf, "%d\n", session->target_id);
4327 }
4328 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4329                         show_priv_session_target_id, NULL);
4330
4331 #define iscsi_priv_session_attr_show(field, format)                     \
4332 static ssize_t                                                          \
4333 show_priv_session_##field(struct device *dev,                           \
4334                           struct device_attribute *attr, char *buf)     \
4335 {                                                                       \
4336         struct iscsi_cls_session *session =                             \
4337                         iscsi_dev_to_session(dev->parent);              \
4338         if (session->field == -1)                                       \
4339                 return sysfs_emit(buf, "off\n");                        \
4340         return sysfs_emit(buf, format"\n", session->field);             \
4341 }
4342
4343 #define iscsi_priv_session_attr_store(field)                            \
4344 static ssize_t                                                          \
4345 store_priv_session_##field(struct device *dev,                          \
4346                            struct device_attribute *attr,               \
4347                            const char *buf, size_t count)               \
4348 {                                                                       \
4349         int val;                                                        \
4350         char *cp;                                                       \
4351         struct iscsi_cls_session *session =                             \
4352                 iscsi_dev_to_session(dev->parent);                      \
4353         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4354             (session->state == ISCSI_SESSION_FAILED))                   \
4355                 return -EBUSY;                                          \
4356         if (strncmp(buf, "off", 3) == 0) {                              \
4357                 session->field = -1;                                    \
4358                 session->field##_sysfs_override = true;                 \
4359         } else {                                                        \
4360                 val = simple_strtoul(buf, &cp, 0);                      \
4361                 if (*cp != '\0' && *cp != '\n')                         \
4362                         return -EINVAL;                                 \
4363                 session->field = val;                                   \
4364                 session->field##_sysfs_override = true;                 \
4365         }                                                               \
4366         return count;                                                   \
4367 }
4368
4369 #define iscsi_priv_session_rw_attr(field, format)                       \
4370         iscsi_priv_session_attr_show(field, format)                     \
4371         iscsi_priv_session_attr_store(field)                            \
4372 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4373                         show_priv_session_##field,                      \
4374                         store_priv_session_##field)
4375
4376 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4377
4378 static struct attribute *iscsi_session_attrs[] = {
4379         &dev_attr_sess_initial_r2t.attr,
4380         &dev_attr_sess_max_outstanding_r2t.attr,
4381         &dev_attr_sess_immediate_data.attr,
4382         &dev_attr_sess_first_burst_len.attr,
4383         &dev_attr_sess_max_burst_len.attr,
4384         &dev_attr_sess_data_pdu_in_order.attr,
4385         &dev_attr_sess_data_seq_in_order.attr,
4386         &dev_attr_sess_erl.attr,
4387         &dev_attr_sess_targetname.attr,
4388         &dev_attr_sess_tpgt.attr,
4389         &dev_attr_sess_password.attr,
4390         &dev_attr_sess_password_in.attr,
4391         &dev_attr_sess_username.attr,
4392         &dev_attr_sess_username_in.attr,
4393         &dev_attr_sess_fast_abort.attr,
4394         &dev_attr_sess_abort_tmo.attr,
4395         &dev_attr_sess_lu_reset_tmo.attr,
4396         &dev_attr_sess_tgt_reset_tmo.attr,
4397         &dev_attr_sess_ifacename.attr,
4398         &dev_attr_sess_initiatorname.attr,
4399         &dev_attr_sess_targetalias.attr,
4400         &dev_attr_sess_boot_root.attr,
4401         &dev_attr_sess_boot_nic.attr,
4402         &dev_attr_sess_boot_target.attr,
4403         &dev_attr_priv_sess_recovery_tmo.attr,
4404         &dev_attr_priv_sess_state.attr,
4405         &dev_attr_priv_sess_creator.attr,
4406         &dev_attr_sess_chap_out_idx.attr,
4407         &dev_attr_sess_chap_in_idx.attr,
4408         &dev_attr_priv_sess_target_id.attr,
4409         &dev_attr_sess_auto_snd_tgt_disable.attr,
4410         &dev_attr_sess_discovery_session.attr,
4411         &dev_attr_sess_portal_type.attr,
4412         &dev_attr_sess_chap_auth.attr,
4413         &dev_attr_sess_discovery_logout.attr,
4414         &dev_attr_sess_bidi_chap.attr,
4415         &dev_attr_sess_discovery_auth_optional.attr,
4416         &dev_attr_sess_def_time2wait.attr,
4417         &dev_attr_sess_def_time2retain.attr,
4418         &dev_attr_sess_isid.attr,
4419         &dev_attr_sess_tsid.attr,
4420         &dev_attr_sess_def_taskmgmt_tmo.attr,
4421         &dev_attr_sess_discovery_parent_idx.attr,
4422         &dev_attr_sess_discovery_parent_type.attr,
4423         NULL,
4424 };
4425
4426 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4427                                             struct attribute *attr, int i)
4428 {
4429         struct device *cdev = container_of(kobj, struct device, kobj);
4430         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4431         struct iscsi_transport *t = session->transport;
4432         int param;
4433
4434         if (attr == &dev_attr_sess_initial_r2t.attr)
4435                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4436         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4437                 param = ISCSI_PARAM_MAX_R2T;
4438         else if (attr == &dev_attr_sess_immediate_data.attr)
4439                 param = ISCSI_PARAM_IMM_DATA_EN;
4440         else if (attr == &dev_attr_sess_first_burst_len.attr)
4441                 param = ISCSI_PARAM_FIRST_BURST;
4442         else if (attr == &dev_attr_sess_max_burst_len.attr)
4443                 param = ISCSI_PARAM_MAX_BURST;
4444         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4445                 param = ISCSI_PARAM_PDU_INORDER_EN;
4446         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4447                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4448         else if (attr == &dev_attr_sess_erl.attr)
4449                 param = ISCSI_PARAM_ERL;
4450         else if (attr == &dev_attr_sess_targetname.attr)
4451                 param = ISCSI_PARAM_TARGET_NAME;
4452         else if (attr == &dev_attr_sess_tpgt.attr)
4453                 param = ISCSI_PARAM_TPGT;
4454         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4455                 param = ISCSI_PARAM_CHAP_IN_IDX;
4456         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4457                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4458         else if (attr == &dev_attr_sess_password.attr)
4459                 param = ISCSI_PARAM_USERNAME;
4460         else if (attr == &dev_attr_sess_password_in.attr)
4461                 param = ISCSI_PARAM_USERNAME_IN;
4462         else if (attr == &dev_attr_sess_username.attr)
4463                 param = ISCSI_PARAM_PASSWORD;
4464         else if (attr == &dev_attr_sess_username_in.attr)
4465                 param = ISCSI_PARAM_PASSWORD_IN;
4466         else if (attr == &dev_attr_sess_fast_abort.attr)
4467                 param = ISCSI_PARAM_FAST_ABORT;
4468         else if (attr == &dev_attr_sess_abort_tmo.attr)
4469                 param = ISCSI_PARAM_ABORT_TMO;
4470         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4471                 param = ISCSI_PARAM_LU_RESET_TMO;
4472         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4473                 param = ISCSI_PARAM_TGT_RESET_TMO;
4474         else if (attr == &dev_attr_sess_ifacename.attr)
4475                 param = ISCSI_PARAM_IFACE_NAME;
4476         else if (attr == &dev_attr_sess_initiatorname.attr)
4477                 param = ISCSI_PARAM_INITIATOR_NAME;
4478         else if (attr == &dev_attr_sess_targetalias.attr)
4479                 param = ISCSI_PARAM_TARGET_ALIAS;
4480         else if (attr == &dev_attr_sess_boot_root.attr)
4481                 param = ISCSI_PARAM_BOOT_ROOT;
4482         else if (attr == &dev_attr_sess_boot_nic.attr)
4483                 param = ISCSI_PARAM_BOOT_NIC;
4484         else if (attr == &dev_attr_sess_boot_target.attr)
4485                 param = ISCSI_PARAM_BOOT_TARGET;
4486         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4487                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4488         else if (attr == &dev_attr_sess_discovery_session.attr)
4489                 param = ISCSI_PARAM_DISCOVERY_SESS;
4490         else if (attr == &dev_attr_sess_portal_type.attr)
4491                 param = ISCSI_PARAM_PORTAL_TYPE;
4492         else if (attr == &dev_attr_sess_chap_auth.attr)
4493                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4494         else if (attr == &dev_attr_sess_discovery_logout.attr)
4495                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4496         else if (attr == &dev_attr_sess_bidi_chap.attr)
4497                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4498         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4499                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4500         else if (attr == &dev_attr_sess_def_time2wait.attr)
4501                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4502         else if (attr == &dev_attr_sess_def_time2retain.attr)
4503                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4504         else if (attr == &dev_attr_sess_isid.attr)
4505                 param = ISCSI_PARAM_ISID;
4506         else if (attr == &dev_attr_sess_tsid.attr)
4507                 param = ISCSI_PARAM_TSID;
4508         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4509                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4510         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4511                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4512         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4513                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4514         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4515                 return S_IRUGO | S_IWUSR;
4516         else if (attr == &dev_attr_priv_sess_state.attr)
4517                 return S_IRUGO;
4518         else if (attr == &dev_attr_priv_sess_creator.attr)
4519                 return S_IRUGO;
4520         else if (attr == &dev_attr_priv_sess_target_id.attr)
4521                 return S_IRUGO;
4522         else {
4523                 WARN_ONCE(1, "Invalid session attr");
4524                 return 0;
4525         }
4526
4527         return t->attr_is_visible(ISCSI_PARAM, param);
4528 }
4529
4530 static struct attribute_group iscsi_session_group = {
4531         .attrs = iscsi_session_attrs,
4532         .is_visible = iscsi_session_attr_is_visible,
4533 };
4534
4535 /*
4536  * iSCSI host attrs
4537  */
4538 #define iscsi_host_attr_show(param)                                     \
4539 static ssize_t                                                          \
4540 show_host_param_##param(struct device *dev,                             \
4541                         struct device_attribute *attr, char *buf)       \
4542 {                                                                       \
4543         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4544         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4545         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4546 }
4547
4548 #define iscsi_host_attr(field, param)                                   \
4549         iscsi_host_attr_show(param)                                     \
4550 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4551                         NULL);
4552
4553 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4554 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4555 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4556 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4557 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4558 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4559
4560 static struct attribute *iscsi_host_attrs[] = {
4561         &dev_attr_host_netdev.attr,
4562         &dev_attr_host_hwaddress.attr,
4563         &dev_attr_host_ipaddress.attr,
4564         &dev_attr_host_initiatorname.attr,
4565         &dev_attr_host_port_state.attr,
4566         &dev_attr_host_port_speed.attr,
4567         NULL,
4568 };
4569
4570 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4571                                          struct attribute *attr, int i)
4572 {
4573         struct device *cdev = container_of(kobj, struct device, kobj);
4574         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4575         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4576         int param;
4577
4578         if (attr == &dev_attr_host_netdev.attr)
4579                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4580         else if (attr == &dev_attr_host_hwaddress.attr)
4581                 param = ISCSI_HOST_PARAM_HWADDRESS;
4582         else if (attr == &dev_attr_host_ipaddress.attr)
4583                 param = ISCSI_HOST_PARAM_IPADDRESS;
4584         else if (attr == &dev_attr_host_initiatorname.attr)
4585                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4586         else if (attr == &dev_attr_host_port_state.attr)
4587                 param = ISCSI_HOST_PARAM_PORT_STATE;
4588         else if (attr == &dev_attr_host_port_speed.attr)
4589                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4590         else {
4591                 WARN_ONCE(1, "Invalid host attr");
4592                 return 0;
4593         }
4594
4595         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4596 }
4597
4598 static struct attribute_group iscsi_host_group = {
4599         .attrs = iscsi_host_attrs,
4600         .is_visible = iscsi_host_attr_is_visible,
4601 };
4602
4603 /* convert iscsi_port_speed values to ascii string name */
4604 static const struct {
4605         enum iscsi_port_speed   value;
4606         char                    *name;
4607 } iscsi_port_speed_names[] = {
4608         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4609         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4610         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4611         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4612         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4613         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4614         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4615 };
4616
4617 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4618 {
4619         int i;
4620         char *speed = "Unknown!";
4621         struct iscsi_cls_host *ihost = shost->shost_data;
4622         uint32_t port_speed = ihost->port_speed;
4623
4624         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4625                 if (iscsi_port_speed_names[i].value & port_speed) {
4626                         speed = iscsi_port_speed_names[i].name;
4627                         break;
4628                 }
4629         }
4630         return speed;
4631 }
4632 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4633
4634 /* convert iscsi_port_state values to ascii string name */
4635 static const struct {
4636         enum iscsi_port_state   value;
4637         char                    *name;
4638 } iscsi_port_state_names[] = {
4639         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4640         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4641 };
4642
4643 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4644 {
4645         int i;
4646         char *state = "Unknown!";
4647         struct iscsi_cls_host *ihost = shost->shost_data;
4648         uint32_t port_state = ihost->port_state;
4649
4650         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4651                 if (iscsi_port_state_names[i].value & port_state) {
4652                         state = iscsi_port_state_names[i].name;
4653                         break;
4654                 }
4655         }
4656         return state;
4657 }
4658 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4659
4660 static int iscsi_session_match(struct attribute_container *cont,
4661                            struct device *dev)
4662 {
4663         struct iscsi_cls_session *session;
4664         struct Scsi_Host *shost;
4665         struct iscsi_internal *priv;
4666
4667         if (!iscsi_is_session_dev(dev))
4668                 return 0;
4669
4670         session = iscsi_dev_to_session(dev);
4671         shost = iscsi_session_to_shost(session);
4672         if (!shost->transportt)
4673                 return 0;
4674
4675         priv = to_iscsi_internal(shost->transportt);
4676         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4677                 return 0;
4678
4679         return &priv->session_cont.ac == cont;
4680 }
4681
4682 static int iscsi_conn_match(struct attribute_container *cont,
4683                            struct device *dev)
4684 {
4685         struct iscsi_cls_session *session;
4686         struct iscsi_cls_conn *conn;
4687         struct Scsi_Host *shost;
4688         struct iscsi_internal *priv;
4689
4690         if (!iscsi_is_conn_dev(dev))
4691                 return 0;
4692
4693         conn = iscsi_dev_to_conn(dev);
4694         session = iscsi_dev_to_session(conn->dev.parent);
4695         shost = iscsi_session_to_shost(session);
4696
4697         if (!shost->transportt)
4698                 return 0;
4699
4700         priv = to_iscsi_internal(shost->transportt);
4701         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4702                 return 0;
4703
4704         return &priv->conn_cont.ac == cont;
4705 }
4706
4707 static int iscsi_host_match(struct attribute_container *cont,
4708                             struct device *dev)
4709 {
4710         struct Scsi_Host *shost;
4711         struct iscsi_internal *priv;
4712
4713         if (!scsi_is_host_device(dev))
4714                 return 0;
4715
4716         shost = dev_to_shost(dev);
4717         if (!shost->transportt  ||
4718             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4719                 return 0;
4720
4721         priv = to_iscsi_internal(shost->transportt);
4722         return &priv->t.host_attrs.ac == cont;
4723 }
4724
4725 struct scsi_transport_template *
4726 iscsi_register_transport(struct iscsi_transport *tt)
4727 {
4728         struct iscsi_internal *priv;
4729         unsigned long flags;
4730         int err;
4731
4732         BUG_ON(!tt);
4733         WARN_ON(tt->ep_disconnect && !tt->unbind_conn);
4734
4735         priv = iscsi_if_transport_lookup(tt);
4736         if (priv)
4737                 return NULL;
4738
4739         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4740         if (!priv)
4741                 return NULL;
4742         INIT_LIST_HEAD(&priv->list);
4743         priv->iscsi_transport = tt;
4744         priv->t.user_scan = iscsi_user_scan;
4745         priv->t.create_work_queue = 1;
4746
4747         priv->dev.class = &iscsi_transport_class;
4748         dev_set_name(&priv->dev, "%s", tt->name);
4749         err = device_register(&priv->dev);
4750         if (err)
4751                 goto free_priv;
4752
4753         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4754         if (err)
4755                 goto unregister_dev;
4756
4757         /* host parameters */
4758         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4759         priv->t.host_attrs.ac.match = iscsi_host_match;
4760         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4761         priv->t.host_size = sizeof(struct iscsi_cls_host);
4762         transport_container_register(&priv->t.host_attrs);
4763
4764         /* connection parameters */
4765         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4766         priv->conn_cont.ac.match = iscsi_conn_match;
4767         priv->conn_cont.ac.grp = &iscsi_conn_group;
4768         transport_container_register(&priv->conn_cont);
4769
4770         /* session parameters */
4771         priv->session_cont.ac.class = &iscsi_session_class.class;
4772         priv->session_cont.ac.match = iscsi_session_match;
4773         priv->session_cont.ac.grp = &iscsi_session_group;
4774         transport_container_register(&priv->session_cont);
4775
4776         spin_lock_irqsave(&iscsi_transport_lock, flags);
4777         list_add(&priv->list, &iscsi_transports);
4778         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4779
4780         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4781         return &priv->t;
4782
4783 unregister_dev:
4784         device_unregister(&priv->dev);
4785         return NULL;
4786 free_priv:
4787         kfree(priv);
4788         return NULL;
4789 }
4790 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4791
4792 int iscsi_unregister_transport(struct iscsi_transport *tt)
4793 {
4794         struct iscsi_internal *priv;
4795         unsigned long flags;
4796
4797         BUG_ON(!tt);
4798
4799         mutex_lock(&rx_queue_mutex);
4800
4801         priv = iscsi_if_transport_lookup(tt);
4802         BUG_ON (!priv);
4803
4804         spin_lock_irqsave(&iscsi_transport_lock, flags);
4805         list_del(&priv->list);
4806         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4807
4808         transport_container_unregister(&priv->conn_cont);
4809         transport_container_unregister(&priv->session_cont);
4810         transport_container_unregister(&priv->t.host_attrs);
4811
4812         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4813         device_unregister(&priv->dev);
4814         mutex_unlock(&rx_queue_mutex);
4815
4816         return 0;
4817 }
4818 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4819
4820 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4821                      struct device *dev, const char *fmt, ...)
4822 {
4823         struct va_format vaf;
4824         va_list args;
4825
4826         va_start(args, fmt);
4827         vaf.fmt = fmt;
4828         vaf.va = &args;
4829         trace(dev, &vaf);
4830         va_end(args);
4831 }
4832 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4833
4834 static __init int iscsi_transport_init(void)
4835 {
4836         int err;
4837         struct netlink_kernel_cfg cfg = {
4838                 .groups = 1,
4839                 .input  = iscsi_if_rx,
4840         };
4841         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4842                 ISCSI_TRANSPORT_VERSION);
4843
4844         atomic_set(&iscsi_session_nr, 0);
4845
4846         err = class_register(&iscsi_transport_class);
4847         if (err)
4848                 return err;
4849
4850         err = class_register(&iscsi_endpoint_class);
4851         if (err)
4852                 goto unregister_transport_class;
4853
4854         err = class_register(&iscsi_iface_class);
4855         if (err)
4856                 goto unregister_endpoint_class;
4857
4858         err = transport_class_register(&iscsi_host_class);
4859         if (err)
4860                 goto unregister_iface_class;
4861
4862         err = transport_class_register(&iscsi_connection_class);
4863         if (err)
4864                 goto unregister_host_class;
4865
4866         err = transport_class_register(&iscsi_session_class);
4867         if (err)
4868                 goto unregister_conn_class;
4869
4870         err = bus_register(&iscsi_flashnode_bus);
4871         if (err)
4872                 goto unregister_session_class;
4873
4874         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4875         if (!nls) {
4876                 err = -ENOBUFS;
4877                 goto unregister_flashnode_bus;
4878         }
4879
4880         iscsi_eh_timer_workq = alloc_workqueue("%s",
4881                         WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
4882                         1, "iscsi_eh");
4883         if (!iscsi_eh_timer_workq) {
4884                 err = -ENOMEM;
4885                 goto release_nls;
4886         }
4887
4888         iscsi_conn_cleanup_workq = alloc_workqueue("%s",
4889                         WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
4890                         "iscsi_conn_cleanup");
4891         if (!iscsi_conn_cleanup_workq) {
4892                 err = -ENOMEM;
4893                 goto destroy_wq;
4894         }
4895
4896         return 0;
4897
4898 destroy_wq:
4899         destroy_workqueue(iscsi_eh_timer_workq);
4900 release_nls:
4901         netlink_kernel_release(nls);
4902 unregister_flashnode_bus:
4903         bus_unregister(&iscsi_flashnode_bus);
4904 unregister_session_class:
4905         transport_class_unregister(&iscsi_session_class);
4906 unregister_conn_class:
4907         transport_class_unregister(&iscsi_connection_class);
4908 unregister_host_class:
4909         transport_class_unregister(&iscsi_host_class);
4910 unregister_iface_class:
4911         class_unregister(&iscsi_iface_class);
4912 unregister_endpoint_class:
4913         class_unregister(&iscsi_endpoint_class);
4914 unregister_transport_class:
4915         class_unregister(&iscsi_transport_class);
4916         return err;
4917 }
4918
4919 static void __exit iscsi_transport_exit(void)
4920 {
4921         destroy_workqueue(iscsi_conn_cleanup_workq);
4922         destroy_workqueue(iscsi_eh_timer_workq);
4923         netlink_kernel_release(nls);
4924         bus_unregister(&iscsi_flashnode_bus);
4925         transport_class_unregister(&iscsi_connection_class);
4926         transport_class_unregister(&iscsi_session_class);
4927         transport_class_unregister(&iscsi_host_class);
4928         class_unregister(&iscsi_endpoint_class);
4929         class_unregister(&iscsi_iface_class);
4930         class_unregister(&iscsi_transport_class);
4931 }
4932
4933 module_init(iscsi_transport_init);
4934 module_exit(iscsi_transport_exit);
4935
4936 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4937               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4938               "Alex Aizman <itn780@yahoo.com>");
4939 MODULE_DESCRIPTION("iSCSI Transport Interface");
4940 MODULE_LICENSE("GPL");
4941 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4942 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);