linux/drivers/scsi/scsi_transport_iscsi.c
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   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 */
  35EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
  36EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
  37EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
  38EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
  39EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
  40
  41static int dbg_session;
  42module_param_named(debug_session, dbg_session, int,
  43                   S_IRUGO | S_IWUSR);
  44MODULE_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
  49static int dbg_conn;
  50module_param_named(debug_conn, dbg_conn, int,
  51                   S_IRUGO | S_IWUSR);
  52MODULE_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
  79struct 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
  89static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  90static struct workqueue_struct *iscsi_eh_timer_workq;
  91
  92static struct workqueue_struct *iscsi_conn_cleanup_workq;
  93
  94static 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 */
 100static LIST_HEAD(iscsi_transports);
 101static 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
 109static 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 */
 119static struct class iscsi_transport_class = {
 120        .name = "iscsi_transport",
 121        .dev_release = iscsi_transport_release,
 122};
 123
 124static ssize_t
 125show_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}
 135static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 136
 137#define show_transport_attr(name, format)                               \
 138static ssize_t                                                          \
 139show_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}                                                                       \
 145static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 146
 147show_transport_attr(caps, "0x%x");
 148
 149static struct attribute *iscsi_transport_attrs[] = {
 150        &dev_attr_handle.attr,
 151        &dev_attr_caps.attr,
 152        NULL,
 153};
 154
 155static 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)    \
 166struct device_attribute dev_attr_##_prefix##_##_name =  \
 167        __ATTR(_name,_mode,_show,_store)
 168
 169static void iscsi_endpoint_release(struct device *dev)
 170{
 171        struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 172        kfree(ep);
 173}
 174
 175static struct class iscsi_endpoint_class = {
 176        .name = "iscsi_endpoint",
 177        .dev_release = iscsi_endpoint_release,
 178};
 179
 180static ssize_t
 181show_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}
 186static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 187
 188static struct attribute *iscsi_endpoint_attrs[] = {
 189        &dev_attr_ep_handle.attr,
 190        NULL,
 191};
 192
 193static struct attribute_group iscsi_endpoint_group = {
 194        .attrs = iscsi_endpoint_attrs,
 195};
 196
 197#define ISCSI_MAX_EPID -1
 198
 199static 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
 207struct iscsi_endpoint *
 208iscsi_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
 248unregister_dev:
 249        device_unregister(&ep->dev);
 250        return NULL;
 251
 252free_ep:
 253        kfree(ep);
 254        return NULL;
 255}
 256EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 257
 258void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 259{
 260        sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 261        device_unregister(&ep->dev);
 262}
 263EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 264
 265void iscsi_put_endpoint(struct iscsi_endpoint *ep)
 266{
 267        put_device(&ep->dev);
 268}
 269EXPORT_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 */
 277struct 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}
 288EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 289
 290/*
 291 * Interface to display network param to sysfs
 292 */
 293
 294static 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
 304static 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)  \
 310struct 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)            \
 315static ssize_t                                                          \
 316show_##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)       \
 326static 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)     \
 330static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 331
 332/* generic read only ipv4 attribute */
 333iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 334iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 335iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 336iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 337iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 338                     ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 339iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 340                     ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 341iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 342iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 343iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 344                     ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 345iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 346                     ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 347iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 348                     ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 349iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 350                     ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 351iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 352                     ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 353iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 354                     ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 355iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 356                     ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 357iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 358                     ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 359iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 360                     ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 361iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 362
 363/* generic read only ipv6 attribute */
 364iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 365iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 366                     ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 367iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 368iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 369                     ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 370iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 371                     ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 372iscsi_iface_net_attr(ipv6_iface, link_local_state,
 373                     ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 374iscsi_iface_net_attr(ipv6_iface, router_state,
 375                     ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 376iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 377                     ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 378iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 379iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 380iscsi_iface_net_attr(ipv6_iface, traffic_class,
 381                     ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 382iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 383iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 384                     ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 385iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 386                     ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 387iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 388                     ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 389iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 390                     ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 391iscsi_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 */
 395iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 396iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 397iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 398iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 399iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 400iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 401iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 402iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 403iscsi_iface_net_attr(iface, tcp_nagle_disable,
 404                     ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 405iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 406iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 407iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 408iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 409iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 410iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 411
 412/* common iscsi specific settings attributes */
 413iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 414iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 415iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 416iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 417iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 418iscsi_iface_attr(iface, data_seq_in_order,
 419                 ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 420iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 421iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 422iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 423iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 424iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 425iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 426iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 427iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 428iscsi_iface_attr(iface, discovery_auth_optional,
 429                 ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 430iscsi_iface_attr(iface, discovery_logout,
 431                 ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 432iscsi_iface_attr(iface, strict_login_comp_en,
 433                 ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 434iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 435
 436static 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
 607static 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
 679static 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 */
 685static 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
 698char *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}
 711EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 712
 713/* convert iscsi_router_state values to ascii string name */
 714static 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
 724char *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}
 737EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 738
 739struct iscsi_iface *
 740iscsi_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
 776unreg_iface:
 777        device_unregister(&iface->dev);
 778        return NULL;
 779
 780free_iface:
 781        put_device(iface->dev.parent);
 782        kfree(iface);
 783        return NULL;
 784}
 785EXPORT_SYMBOL_GPL(iscsi_create_iface);
 786
 787void iscsi_destroy_iface(struct iscsi_iface *iface)
 788{
 789        sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 790        device_unregister(&iface->dev);
 791}
 792EXPORT_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)      \
 799struct 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)               \
 804static ssize_t                                                          \
 805show_##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)               \
 817static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 818                            show_##type##_##name, NULL);
 819
 820/* Flash node session attributes */
 821
 822iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 823                          ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 824iscsi_flashnode_sess_attr(fnode, discovery_session,
 825                          ISCSI_FLASHNODE_DISCOVERY_SESS);
 826iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 827iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 828iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 829iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 830iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 831                          ISCSI_FLASHNODE_DATASEQ_INORDER);
 832iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 833                          ISCSI_FLASHNODE_PDU_INORDER);
 834iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 835iscsi_flashnode_sess_attr(fnode, discovery_logout,
 836                          ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 837iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 838iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 839                          ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 840iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 841iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 842iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 843iscsi_flashnode_sess_attr(fnode, def_time2retain,
 844                          ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 845iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 846iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 847iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 848iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 849iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 850                          ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 851iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 852iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 853iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 854iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 855                          ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 856iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 857                          ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 858iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 859iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 860iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 861iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 862iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 863iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 864iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 865
 866static 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
 903static 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
 987static 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
 992static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
 993        &iscsi_flashnode_sess_attr_group,
 994        NULL,
 995};
 996
 997static 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
1008static 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)               \
1016static ssize_t                                                          \
1017show_##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)               \
1030static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1031                            show_##type##_##name, NULL);
1032
1033/* Flash node connection attributes */
1034
1035iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1036                          ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1037iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1038iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1039iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1040iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1041                          ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1042iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1043                          ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1044iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1045                          ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1046iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1047                          ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1048iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1049                          ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1050iscsi_flashnode_conn_attr(fnode, fragment_disable,
1051                          ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1052iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1053iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1054iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1055iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1056                          ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1057iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1058                          ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1059iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1060iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1061iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1062iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1063                          ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1064iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1065                          ISCSI_FLASHNODE_REDIRECT_IPADDR);
1066iscsi_flashnode_conn_attr(fnode, max_segment_size,
1067                          ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1068iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1069                          ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1070iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1071iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1072iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1073iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1074
1075static 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
1105static 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
1174static 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
1179static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1180        &iscsi_flashnode_conn_attr_group,
1181        NULL,
1182};
1183
1184static 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
1194static 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
1200static struct bus_type iscsi_flashnode_bus;
1201
1202int 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}
1209EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1210
1211static 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 */
1229struct iscsi_bus_flash_session *
1230iscsi_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
1258free_fnode_sess:
1259        kfree(fnode_sess);
1260        return NULL;
1261}
1262EXPORT_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 */
1277struct iscsi_bus_flash_conn *
1278iscsi_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
1306free_fnode_conn:
1307        kfree(fnode_conn);
1308        return NULL;
1309}
1310EXPORT_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 */
1323static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1324{
1325        return dev->bus == &iscsi_flashnode_bus;
1326}
1327
1328static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1329{
1330        device_unregister(&fnode_conn->dev);
1331        return 0;
1332}
1333
1334static 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
1345exit_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 */
1360static struct iscsi_bus_flash_session *
1361iscsi_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 */
1387struct device *
1388iscsi_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}
1393EXPORT_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 */
1406struct device *
1407iscsi_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}
1412EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1413
1414static 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 */
1429void 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}
1441EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1442
1443static 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 */
1459void 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}
1464EXPORT_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 */
1473static 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
1514fail_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 */
1529static int
1530iscsi_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
1553static 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
1569static 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
1579static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1580                               "iscsi_host",
1581                               iscsi_setup_host,
1582                               iscsi_remove_host,
1583                               NULL);
1584
1585static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1586                               "iscsi_session",
1587                               NULL,
1588                               NULL,
1589                               NULL);
1590
1591static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1592                               "iscsi_connection",
1593                               NULL,
1594                               NULL,
1595                               NULL);
1596
1597static struct sock *nls;
1598static DEFINE_MUTEX(rx_queue_mutex);
1599
1600static LIST_HEAD(sesslist);
1601static DEFINE_SPINLOCK(sesslock);
1602static LIST_HEAD(connlist);
1603static LIST_HEAD(connlist_err);
1604static DEFINE_SPINLOCK(connlock);
1605
1606static 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 */
1615static 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 */
1634static 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 */
1654static 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
1663static 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
1677int 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}
1697EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1698
1699int 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}
1710EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1711
1712static 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
1723int iscsi_is_session_dev(const struct device *dev)
1724{
1725        return dev->release == iscsi_session_release;
1726}
1727EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1728
1729static 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
1739void 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}
1745EXPORT_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 */
1755int 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}
1764EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1765
1766struct iscsi_scan_data {
1767        unsigned int channel;
1768        unsigned int id;
1769        u64 lun;
1770        enum scsi_scan_mode rescan;
1771};
1772
1773static 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
1810user_scan_exit:
1811        mutex_unlock(&ihost->mutex);
1812        ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1813        return 0;
1814}
1815
1816static 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
1830static 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 */
1856int 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}
1876EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1877
1878static 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
1910static 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 */
1948void 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}
1960EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1961
1962static 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
1981void iscsi_block_session(struct iscsi_cls_session *session)
1982{
1983        queue_work(iscsi_eh_timer_workq, &session->block_work);
1984}
1985EXPORT_SYMBOL_GPL(iscsi_block_session);
1986
1987static 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
2018unbind_session_exit:
2019        iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2020        ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2021}
2022
2023static 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
2031struct iscsi_cls_session *
2032iscsi_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}
2067EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2068
2069int 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
2112release_dev:
2113        device_del(&session->dev);
2114release_ida:
2115        if (session->ida_used)
2116                ida_simple_remove(&iscsi_sess_ida, session->target_id);
2117
2118        return err;
2119}
2120EXPORT_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 */
2131struct iscsi_cls_session *
2132iscsi_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}
2147EXPORT_SYMBOL_GPL(iscsi_create_session);
2148
2149static 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
2159static int iscsi_is_conn_dev(const struct device *dev)
2160{
2161        return dev->release == iscsi_conn_release;
2162}
2163
2164static 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
2171void 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}
2216EXPORT_SYMBOL_GPL(iscsi_remove_session);
2217
2218static 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
2239static 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
2279static 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
2298static 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
2335void 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}
2341EXPORT_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 */
2358struct iscsi_cls_conn *
2359iscsi_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
2406release_conn_ref:
2407        device_unregister(&conn->dev);
2408        put_device(&session->dev);
2409        return NULL;
2410release_parent_ref:
2411        put_device(&session->dev);
2412free_conn:
2413        kfree(conn);
2414        return NULL;
2415}
2416
2417EXPORT_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 */
2425int 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}
2438EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2439
2440void iscsi_put_conn(struct iscsi_cls_conn *conn)
2441{
2442        put_device(&conn->dev);
2443}
2444EXPORT_SYMBOL_GPL(iscsi_put_conn);
2445
2446void iscsi_get_conn(struct iscsi_cls_conn *conn)
2447{
2448        get_device(&conn->dev);
2449}
2450EXPORT_SYMBOL_GPL(iscsi_get_conn);
2451
2452/*
2453 * iscsi interface functions
2454 */
2455static struct iscsi_internal *
2456iscsi_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
2472static int
2473iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2474{
2475        return nlmsg_multicast(nls, skb, 0, group, gfp);
2476}
2477
2478static int
2479iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2480{
2481        return nlmsg_unicast(nls, skb, portid);
2482}
2483
2484int 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}
2520EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2521
2522int 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}
2555EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2556
2557void 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}
2592EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2593
2594void 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}
2626EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2627
2628void 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}
2657EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2658
2659void 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}
2686EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2687
2688static int
2689iscsi_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
2706static int
2707iscsi_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 */
2776int 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}
2839EXPORT_SYMBOL_GPL(iscsi_session_event);
2840
2841static int
2842iscsi_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
2865static int
2866iscsi_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
2892static int
2893iscsi_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
2910static int
2911iscsi_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
2947static 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;
2978release_host:
2979        if (shost)
2980                scsi_host_put(shost);
2981        return err;
2982}
2983
2984static 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);
3019put_ep:
3020        iscsi_put_endpoint(ep);
3021        return 0;
3022}
3023
3024static int
3025iscsi_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
3056static int
3057iscsi_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
3082static int
3083iscsi_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
3109static int
3110iscsi_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
3133static 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
3151static int
3152iscsi_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
3174static int
3175iscsi_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
3201static int
3202iscsi_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
3265exit_get_chap:
3266        scsi_host_put(shost);
3267        return err;
3268}
3269
3270static 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
3292static 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
3313static 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
3322char *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}
3335EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3336
3337static 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
3380put_sess:
3381        put_device(&fnode_sess->dev);
3382
3383put_host:
3384        scsi_host_put(shost);
3385
3386exit_set_fnode:
3387        return err;
3388}
3389
3390static 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
3418put_host:
3419        scsi_host_put(shost);
3420
3421exit_new_fnode:
3422        return err;
3423}
3424
3425static 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
3458put_host:
3459        scsi_host_put(shost);
3460
3461exit_del_fnode:
3462        return err;
3463}
3464
3465static 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
3507put_sess:
3508        put_device(&fnode_sess->dev);
3509
3510put_host:
3511        scsi_host_put(shost);
3512
3513exit_login_fnode:
3514        return err;
3515}
3516
3517static 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
3560put_sess:
3561        put_device(&fnode_sess->dev);
3562
3563put_host:
3564        scsi_host_put(shost);
3565
3566exit_logout_fnode:
3567        return err;
3568}
3569
3570static 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
3600put_host:
3601        scsi_host_put(shost);
3602
3603exit_logout_sid:
3604        return err;
3605}
3606
3607static int
3608iscsi_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
3672exit_host_stats:
3673        scsi_host_put(shost);
3674        return err;
3675}
3676
3677static 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
3791static int
3792iscsi_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 */
3959static void
3960iscsi_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)              \
4013struct 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)                                     \
4020static ssize_t                                                          \
4021show_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)                                     \
4031static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
4032                        NULL);
4033
4034iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
4035iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
4036iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
4037iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
4038iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
4039iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
4040iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
4041iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
4042