git.oblomov.eu Git - linux-2.6/blob - drivers/scsi/scsi_transport_fc.c

   1 /*
   2  *  FiberChannel transport specific attributes exported to sysfs.
   3  *
   4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ========
  21  *
  22  *  Copyright (C) 2004-2005   James Smart, Emulex Corporation
  23  *    Rewrite for host, target, device, and remote port attributes,
  24  *    statistics, and service functions...
  25  *
  26  */
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/sched.h>        /* workqueue stuff, HZ */
  30 #include <scsi/scsi_device.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_fc.h>
  34 #include <scsi/scsi_cmnd.h>
  35 #include <linux/netlink.h>
  36 #include <net/netlink.h>
  37 #include <scsi/scsi_netlink_fc.h>
  38 #include "scsi_priv.h"
  39
  40 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  41
  42 /*
  43  * Redefine so that we can have same named attributes in the
  44  * sdev/starget/host objects.
  45  */
  46 #define FC_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)          \
  47 struct class_device_attribute class_device_attr_##_prefix##_##_name =   \
  48         __ATTR(_name,_mode,_show,_store)
  49
  50 #define fc_enum_name_search(title, table_type, table)                   \
  51 static const char *get_fc_##title##_name(enum table_type table_key)     \
  52 {                                                                       \
  53         int i;                                                          \
  54         char *name = NULL;                                              \
  55                                                                         \
  56         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  57                 if (table[i].value == table_key) {                      \
  58                         name = table[i].name;                           \
  59                         break;                                          \
  60                 }                                                       \
  61         }                                                               \
  62         return name;                                                    \
  63 }
  64
  65 #define fc_enum_name_match(title, table_type, table)                    \
  66 static int get_fc_##title##_match(const char *table_key,                \
  67                 enum table_type *value)                                 \
  68 {                                                                       \
  69         int i;                                                          \
  70                                                                         \
  71         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  72                 if (strncmp(table_key, table[i].name,                   \
  73                                 table[i].matchlen) == 0) {              \
  74                         *value = table[i].value;                        \
  75                         return 0; /* success */                         \
  76                 }                                                       \
  77         }                                                               \
  78         return 1; /* failure */                                         \
  79 }
  80
  81
  82 /* Convert fc_port_type values to ascii string name */
  83 static struct {
  84         enum fc_port_type       value;
  85         char                    *name;
  86 } fc_port_type_names[] = {
  87         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
  88         { FC_PORTTYPE_OTHER,            "Other" },
  89         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
  90         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
  91         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
  92         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
  93         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection" },
  94 };
  95 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
  96 #define FC_PORTTYPE_MAX_NAMELEN         50
  97
  98
  99 /* Convert fc_host_event_code values to ascii string name */
 100 static const struct {
 101         enum fc_host_event_code         value;
 102         char                            *name;
 103 } fc_host_event_code_names[] = {
 104         { FCH_EVT_LIP,                  "lip" },
 105         { FCH_EVT_LINKUP,               "link_up" },
 106         { FCH_EVT_LINKDOWN,             "link_down" },
 107         { FCH_EVT_LIPRESET,             "lip_reset" },
 108         { FCH_EVT_RSCN,                 "rscn" },
 109         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
 110         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
 111         { FCH_EVT_PORT_ONLINE,          "port_online" },
 112         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
 113         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
 114         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
 115         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
 116 };
 117 fc_enum_name_search(host_event_code, fc_host_event_code,
 118                 fc_host_event_code_names)
 119 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
 120
 121
 122 /* Convert fc_port_state values to ascii string name */
 123 static struct {
 124         enum fc_port_state      value;
 125         char                    *name;
 126 } fc_port_state_names[] = {
 127         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
 128         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 129         { FC_PORTSTATE_ONLINE,          "Online" },
 130         { FC_PORTSTATE_OFFLINE,         "Offline" },
 131         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 132         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 133         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 134         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 135         { FC_PORTSTATE_ERROR,           "Error" },
 136         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 137         { FC_PORTSTATE_DELETED,         "Deleted" },
 138 };
 139 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 140 #define FC_PORTSTATE_MAX_NAMELEN        20
 141
 142
 143 /* Convert fc_tgtid_binding_type values to ascii string name */
 144 static const struct {
 145         enum fc_tgtid_binding_type      value;
 146         char                            *name;
 147         int                             matchlen;
 148 } fc_tgtid_binding_type_names[] = {
 149         { FC_TGTID_BIND_NONE, "none", 4 },
 150         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 151         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 152         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 153 };
 154 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 155                 fc_tgtid_binding_type_names)
 156 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 157                 fc_tgtid_binding_type_names)
 158 #define FC_BINDTYPE_MAX_NAMELEN 30
 159
 160
 161 #define fc_bitfield_name_search(title, table)                   \
 162 static ssize_t                                                  \
 163 get_fc_##title##_names(u32 table_key, char *buf)                \
 164 {                                                               \
 165         char *prefix = "";                                      \
 166         ssize_t len = 0;                                        \
 167         int i;                                                  \
 168                                                                 \
 169         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 170                 if (table[i].value & table_key) {               \
 171                         len += sprintf(buf + len, "%s%s",       \
 172                                 prefix, table[i].name);         \
 173                         prefix = ", ";                          \
 174                 }                                               \
 175         }                                                       \
 176         len += sprintf(buf + len, "\n");                        \
 177         return len;                                             \
 178 }
 179
 180
 181 /* Convert FC_COS bit values to ascii string name */
 182 static const struct {
 183         u32                     value;
 184         char                    *name;
 185 } fc_cos_names[] = {
 186         { FC_COS_CLASS1,        "Class 1" },
 187         { FC_COS_CLASS2,        "Class 2" },
 188         { FC_COS_CLASS3,        "Class 3" },
 189         { FC_COS_CLASS4,        "Class 4" },
 190         { FC_COS_CLASS6,        "Class 6" },
 191 };
 192 fc_bitfield_name_search(cos, fc_cos_names)
 193
 194
 195 /* Convert FC_PORTSPEED bit values to ascii string name */
 196 static const struct {
 197         u32                     value;
 198         char                    *name;
 199 } fc_port_speed_names[] = {
 200         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 201         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 202         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 203         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 204         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 205 };
 206 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 207
 208
 209 static int
 210 show_fc_fc4s (char *buf, u8 *fc4_list)
 211 {
 212         int i, len=0;
 213
 214         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 215                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 216         len += sprintf(buf + len, "\n");
 217         return len;
 218 }
 219
 220
 221 /* Convert FC_RPORT_ROLE bit values to ascii string name */
 222 static const struct {
 223         u32                     value;
 224         char                    *name;
 225 } fc_remote_port_role_names[] = {
 226         { FC_RPORT_ROLE_FCP_TARGET,     "FCP Target" },
 227         { FC_RPORT_ROLE_FCP_INITIATOR,  "FCP Initiator" },
 228         { FC_RPORT_ROLE_IP_PORT,        "IP Port" },
 229 };
 230 fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names)
 231
 232 /*
 233  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 234  */
 235 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 236 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 237 #define FC_FPORT_PORTID                 0x00000e
 238 #define FC_FABCTLR_PORTID               0x00000d
 239 #define FC_DIRSRVR_PORTID               0x00000c
 240 #define FC_TIMESRVR_PORTID              0x00000b
 241 #define FC_MGMTSRVR_PORTID              0x00000a
 242
 243
 244 static void fc_timeout_deleted_rport(struct work_struct *work);
 245 static void fc_timeout_fail_rport_io(struct work_struct *work);
 246 static void fc_scsi_scan_rport(struct work_struct *work);
 247
 248 /*
 249  * Attribute counts pre object type...
 250  * Increase these values if you add attributes
 251  */
 252 #define FC_STARGET_NUM_ATTRS    3
 253 #define FC_RPORT_NUM_ATTRS      10
 254 #define FC_HOST_NUM_ATTRS       17
 255
 256 struct fc_internal {
 257         struct scsi_transport_template t;
 258         struct fc_function_template *f;
 259
 260         /*
 261          * For attributes : each object has :
 262          *   An array of the actual attributes structures
 263          *   An array of null-terminated pointers to the attribute
 264          *     structures - used for mid-layer interaction.
 265          *
 266          * The attribute containers for the starget and host are are
 267          * part of the midlayer. As the remote port is specific to the
 268          * fc transport, we must provide the attribute container.
 269          */
 270         struct class_device_attribute private_starget_attrs[
 271                                                         FC_STARGET_NUM_ATTRS];
 272         struct class_device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 273
 274         struct class_device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 275         struct class_device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 276
 277         struct transport_container rport_attr_cont;
 278         struct class_device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 279         struct class_device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 280 };
 281
 282 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 283
 284 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 285                            struct class_device *cdev)
 286 {
 287         struct scsi_target *starget = to_scsi_target(dev);
 288         struct fc_rport *rport = starget_to_rport(starget);
 289
 290         /*
 291          * if parent is remote port, use values from remote port.
 292          * Otherwise, this host uses the fc_transport, but not the
 293          * remote port interface. As such, initialize to known non-values.
 294          */
 295         if (rport) {
 296                 fc_starget_node_name(starget) = rport->node_name;
 297                 fc_starget_port_name(starget) = rport->port_name;
 298                 fc_starget_port_id(starget) = rport->port_id;
 299         } else {
 300                 fc_starget_node_name(starget) = -1;
 301                 fc_starget_port_name(starget) = -1;
 302                 fc_starget_port_id(starget) = -1;
 303         }
 304
 305         return 0;
 306 }
 307
 308 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 309                                "fc_transport",
 310                                fc_target_setup,
 311                                NULL,
 312                                NULL);
 313
 314 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 315                          struct class_device *cdev)
 316 {
 317         struct Scsi_Host *shost = dev_to_shost(dev);
 318         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 319
 320         /*
 321          * Set default values easily detected by the midlayer as
 322          * failure cases.  The scsi lldd is responsible for initializing
 323          * all transport attributes to valid values per host.
 324          */
 325         fc_host->node_name = -1;
 326         fc_host->port_name = -1;
 327         fc_host->permanent_port_name = -1;
 328         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 329         memset(fc_host->supported_fc4s, 0,
 330                 sizeof(fc_host->supported_fc4s));
 331         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 332         fc_host->maxframe_size = -1;
 333         memset(fc_host->serial_number, 0,
 334                 sizeof(fc_host->serial_number));
 335
 336         fc_host->port_id = -1;
 337         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 338         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 339         memset(fc_host->active_fc4s, 0,
 340                 sizeof(fc_host->active_fc4s));
 341         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 342         fc_host->fabric_name = -1;
 343         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 344         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
 345
 346         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 347
 348         INIT_LIST_HEAD(&fc_host->rports);
 349         INIT_LIST_HEAD(&fc_host->rport_bindings);
 350         fc_host->next_rport_number = 0;
 351         fc_host->next_target_id = 0;
 352
 353         snprintf(fc_host->work_q_name, KOBJ_NAME_LEN, "fc_wq_%d",
 354                 shost->host_no);
 355         fc_host->work_q = create_singlethread_workqueue(
 356                                         fc_host->work_q_name);
 357         if (!fc_host->work_q)
 358                 return -ENOMEM;
 359
 360         snprintf(fc_host->devloss_work_q_name, KOBJ_NAME_LEN, "fc_dl_%d",
 361                 shost->host_no);
 362         fc_host->devloss_work_q = create_singlethread_workqueue(
 363                                         fc_host->devloss_work_q_name);
 364         if (!fc_host->devloss_work_q) {
 365                 destroy_workqueue(fc_host->work_q);
 366                 fc_host->work_q = NULL;
 367                 return -ENOMEM;
 368         }
 369
 370         return 0;
 371 }
 372
 373 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 374                                "fc_host",
 375                                fc_host_setup,
 376                                NULL,
 377                                NULL);
 378
 379 /*
 380  * Setup and Remove actions for remote ports are handled
 381  * in the service functions below.
 382  */
 383 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 384                                "fc_remote_ports",
 385                                NULL,
 386                                NULL,
 387                                NULL);
 388
 389 /*
 390  * Module Parameters
 391  */
 392
 393 /*
 394  * dev_loss_tmo: the default number of seconds that the FC transport
 395  *   should insulate the loss of a remote port.
 396  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 397  */
 398 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
 399
 400 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, int, S_IRUGO|S_IWUSR);
 401 MODULE_PARM_DESC(dev_loss_tmo,
 402                  "Maximum number of seconds that the FC transport should"
 403                  " insulate the loss of a remote port. Once this value is"
 404                  " exceeded, the scsi target is removed. Value should be"
 405                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
 406
 407 /**
 408  * Netlink Infrastructure
 409  **/
 410
 411 static atomic_t fc_event_seq;
 412
 413 /**
 414  * fc_get_event_number - Obtain the next sequential FC event number
 415  *
 416  * Notes:
 417  *   We could have inline'd this, but it would have required fc_event_seq to
 418  *   be exposed. For now, live with the subroutine call.
 419  *   Atomic used to avoid lock/unlock...
 420  **/
 421 u32
 422 fc_get_event_number(void)
 423 {
 424         return atomic_add_return(1, &fc_event_seq);
 425 }
 426 EXPORT_SYMBOL(fc_get_event_number);
 427
 428
 429 /**
 430  * fc_host_post_event - called to post an even on an fc_host.
 431  *
 432  * @shost:              host the event occurred on
 433  * @event_number:       fc event number obtained from get_fc_event_number()
 434  * @event_code:         fc_host event being posted
 435  * @event_data:         32bits of data for the event being posted
 436  *
 437  * Notes:
 438  *      This routine assumes no locks are held on entry.
 439  **/
 440 void
 441 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
 442                 enum fc_host_event_code event_code, u32 event_data)
 443 {
 444         struct sk_buff *skb;
 445         struct nlmsghdr *nlh;
 446         struct fc_nl_event *event;
 447         const char *name;
 448         u32 len, skblen;
 449         int err;
 450
 451         if (!scsi_nl_sock) {
 452                 err = -ENOENT;
 453                 goto send_fail;
 454         }
 455
 456         len = FC_NL_MSGALIGN(sizeof(*event));
 457         skblen = NLMSG_SPACE(len);
 458
 459         skb = alloc_skb(skblen, GFP_KERNEL);
 460         if (!skb) {
 461                 err = -ENOBUFS;
 462                 goto send_fail;
 463         }
 464
 465         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 466                                 skblen - sizeof(*nlh), 0);
 467         if (!nlh) {
 468                 err = -ENOBUFS;
 469                 goto send_fail_skb;
 470         }
 471         event = NLMSG_DATA(nlh);
 472
 473         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 474                                 FC_NL_ASYNC_EVENT, len);
 475         event->seconds = get_seconds();
 476         event->vendor_id = 0;
 477         event->host_no = shost->host_no;
 478         event->event_datalen = sizeof(u32);     /* bytes */
 479         event->event_num = event_number;
 480         event->event_code = event_code;
 481         event->event_data = event_data;
 482
 483         err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 484                               GFP_KERNEL);
 485         if (err && (err != -ESRCH))     /* filter no recipient errors */
 486                 /* nlmsg_multicast already kfree_skb'd */
 487                 goto send_fail;
 488
 489         return;
 490
 491 send_fail_skb:
 492         kfree_skb(skb);
 493 send_fail:
 494         name = get_fc_host_event_code_name(event_code);
 495         printk(KERN_WARNING
 496                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
 497                 __FUNCTION__, shost->host_no,
 498                 (name) ? name : "<unknown>", event_data, err);
 499         return;
 500 }
 501 EXPORT_SYMBOL(fc_host_post_event);
 502
 503
 504 /**
 505  * fc_host_post_vendor_event - called to post a vendor unique event on
 506  *                             a fc_host
 507  *
 508  * @shost:              host the event occurred on
 509  * @event_number:       fc event number obtained from get_fc_event_number()
 510  * @data_len:           amount, in bytes, of vendor unique data
 511  * @data_buf:           pointer to vendor unique data
 512  *
 513  * Notes:
 514  *      This routine assumes no locks are held on entry.
 515  **/
 516 void
 517 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
 518                 u32 data_len, char * data_buf, u64 vendor_id)
 519 {
 520         struct sk_buff *skb;
 521         struct nlmsghdr *nlh;
 522         struct fc_nl_event *event;
 523         u32 len, skblen;
 524         int err;
 525
 526         if (!scsi_nl_sock) {
 527                 err = -ENOENT;
 528                 goto send_vendor_fail;
 529         }
 530
 531         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
 532         skblen = NLMSG_SPACE(len);
 533
 534         skb = alloc_skb(skblen, GFP_KERNEL);
 535         if (!skb) {
 536                 err = -ENOBUFS;
 537                 goto send_vendor_fail;
 538         }
 539
 540         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 541                                 skblen - sizeof(*nlh), 0);
 542         if (!nlh) {
 543                 err = -ENOBUFS;
 544                 goto send_vendor_fail_skb;
 545         }
 546         event = NLMSG_DATA(nlh);
 547
 548         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 549                                 FC_NL_ASYNC_EVENT, len);
 550         event->seconds = get_seconds();
 551         event->vendor_id = vendor_id;
 552         event->host_no = shost->host_no;
 553         event->event_datalen = data_len;        /* bytes */
 554         event->event_num = event_number;
 555         event->event_code = FCH_EVT_VENDOR_UNIQUE;
 556         memcpy(&event->event_data, data_buf, data_len);
 557
 558         err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 559                               GFP_KERNEL);
 560         if (err && (err != -ESRCH))     /* filter no recipient errors */
 561                 /* nlmsg_multicast already kfree_skb'd */
 562                 goto send_vendor_fail;
 563
 564         return;
 565
 566 send_vendor_fail_skb:
 567         kfree_skb(skb);
 568 send_vendor_fail:
 569         printk(KERN_WARNING
 570                 "%s: Dropped Event : host %d vendor_unique - err %d\n",
 571                 __FUNCTION__, shost->host_no, err);
 572         return;
 573 }
 574 EXPORT_SYMBOL(fc_host_post_vendor_event);
 575
 576
 577
 578 static __init int fc_transport_init(void)
 579 {
 580         int error;
 581
 582         atomic_set(&fc_event_seq, 0);
 583
 584         error = transport_class_register(&fc_host_class);
 585         if (error)
 586                 return error;
 587         error = transport_class_register(&fc_rport_class);
 588         if (error)
 589                 return error;
 590         return transport_class_register(&fc_transport_class);
 591 }
 592
 593 static void __exit fc_transport_exit(void)
 594 {
 595         transport_class_unregister(&fc_transport_class);
 596         transport_class_unregister(&fc_rport_class);
 597         transport_class_unregister(&fc_host_class);
 598 }
 599
 600 /*
 601  * FC Remote Port Attribute Management
 602  */
 603
 604 #define fc_rport_show_function(field, format_string, sz, cast)          \
 605 static ssize_t                                                          \
 606 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 607 {                                                                       \
 608         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 609         struct Scsi_Host *shost = rport_to_shost(rport);                \
 610         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 611         if ((i->f->get_rport_##field) &&                                \
 612             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 613               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 614               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 615                 i->f->get_rport_##field(rport);                         \
 616         return snprintf(buf, sz, format_string, cast rport->field);     \
 617 }
 618
 619 #define fc_rport_store_function(field)                                  \
 620 static ssize_t                                                          \
 621 store_fc_rport_##field(struct class_device *cdev, const char *buf,      \
 622                            size_t count)                                \
 623 {                                                                       \
 624         int val;                                                        \
 625         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 626         struct Scsi_Host *shost = rport_to_shost(rport);                \
 627         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 628         char *cp;                                                       \
 629         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
 630             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
 631             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
 632                 return -EBUSY;                                          \
 633         val = simple_strtoul(buf, &cp, 0);                              \
 634         if (*cp && (*cp != '\n'))                                       \
 635                 return -EINVAL;                                         \
 636         i->f->set_rport_##field(rport, val);                            \
 637         return count;                                                   \
 638 }
 639
 640 #define fc_rport_rd_attr(field, format_string, sz)                      \
 641         fc_rport_show_function(field, format_string, sz, )              \
 642 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 643                          show_fc_rport_##field, NULL)
 644
 645 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 646         fc_rport_show_function(field, format_string, sz, (cast))        \
 647 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 648                           show_fc_rport_##field, NULL)
 649
 650 #define fc_rport_rw_attr(field, format_string, sz)                      \
 651         fc_rport_show_function(field, format_string, sz, )              \
 652         fc_rport_store_function(field)                                  \
 653 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,            \
 654                         show_fc_rport_##field,                          \
 655                         store_fc_rport_##field)
 656
 657
 658 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 659 static ssize_t                                                          \
 660 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
 661 {                                                                       \
 662         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 663         return snprintf(buf, sz, format_string, cast rport->field);     \
 664 }
 665
 666 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 667         fc_private_rport_show_function(field, format_string, sz, )      \
 668 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 669                          show_fc_rport_##field, NULL)
 670
 671 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 672         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 673 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
 674                           show_fc_rport_##field, NULL)
 675
 676
 677 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 678 static ssize_t                                                          \
 679 show_fc_rport_##title (struct class_device *cdev, char *buf)            \
 680 {                                                                       \
 681         struct fc_rport *rport = transport_class_to_rport(cdev);        \
 682         const char *name;                                               \
 683         name = get_fc_##title##_name(rport->title);                     \
 684         if (!name)                                                      \
 685                 return -EINVAL;                                         \
 686         return snprintf(buf, maxlen, "%s\n", name);                     \
 687 }                                                                       \
 688 static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO,                      \
 689                         show_fc_rport_##title, NULL)
 690
 691
 692 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 693         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 694         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 695         i->private_rport_attrs[count].store = NULL;                     \
 696         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 697         if (i->f->show_rport_##field)                                   \
 698                 count++
 699
 700 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 701         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 702         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 703         i->private_rport_attrs[count].store = NULL;                     \
 704         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 705         count++
 706
 707 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 708         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 709         if (!i->f->set_rport_##field) {                                 \
 710                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 711                 i->private_rport_attrs[count].store = NULL;             \
 712         }                                                               \
 713         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 714         if (i->f->show_rport_##field)                                   \
 715                 count++
 716
 717 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
 718 {                                                                       \
 719         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
 720         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 721         count++;                                                        \
 722 }
 723
 724
 725 /* The FC Transport Remote Port Attributes: */
 726
 727 /* Fixed Remote Port Attributes */
 728
 729 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 730
 731 static ssize_t
 732 show_fc_rport_supported_classes (struct class_device *cdev, char *buf)
 733 {
 734         struct fc_rport *rport = transport_class_to_rport(cdev);
 735         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 736                 return snprintf(buf, 20, "unspecified\n");
 737         return get_fc_cos_names(rport->supported_classes, buf);
 738 }
 739 static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 740                 show_fc_rport_supported_classes, NULL);
 741
 742 /* Dynamic Remote Port Attributes */
 743
 744 /*
 745  * dev_loss_tmo attribute
 746  */
 747 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
 748 static ssize_t
 749 store_fc_rport_dev_loss_tmo(struct class_device *cdev, const char *buf,
 750                            size_t count)
 751 {
 752         int val;
 753         struct fc_rport *rport = transport_class_to_rport(cdev);
 754         struct Scsi_Host *shost = rport_to_shost(rport);
 755         struct fc_internal *i = to_fc_internal(shost->transportt);
 756         char *cp;
 757         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 758             (rport->port_state == FC_PORTSTATE_DELETED) ||
 759             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 760                 return -EBUSY;
 761         val = simple_strtoul(buf, &cp, 0);
 762         if ((*cp && (*cp != '\n')) ||
 763             (val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
 764                 return -EINVAL;
 765         i->f->set_rport_dev_loss_tmo(rport, val);
 766         return count;
 767 }
 768 static FC_CLASS_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
 769                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
 770
 771
 772 /* Private Remote Port Attributes */
 773
 774 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 775 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 776 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 777
 778 static ssize_t
 779 show_fc_rport_roles (struct class_device *cdev, char *buf)
 780 {
 781         struct fc_rport *rport = transport_class_to_rport(cdev);
 782
 783         /* identify any roles that are port_id specific */
 784         if ((rport->port_id != -1) &&
 785             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 786                                         FC_WELLKNOWN_PORTID_MASK) {
 787                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 788                 case FC_FPORT_PORTID:
 789                         return snprintf(buf, 30, "Fabric Port\n");
 790                 case FC_FABCTLR_PORTID:
 791                         return snprintf(buf, 30, "Fabric Controller\n");
 792                 case FC_DIRSRVR_PORTID:
 793                         return snprintf(buf, 30, "Directory Server\n");
 794                 case FC_TIMESRVR_PORTID:
 795                         return snprintf(buf, 30, "Time Server\n");
 796                 case FC_MGMTSRVR_PORTID:
 797                         return snprintf(buf, 30, "Management Server\n");
 798                 default:
 799                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 800                 }
 801         } else {
 802                 if (rport->roles == FC_RPORT_ROLE_UNKNOWN)
 803                         return snprintf(buf, 20, "unknown\n");
 804                 return get_fc_remote_port_roles_names(rport->roles, buf);
 805         }
 806 }
 807 static FC_CLASS_DEVICE_ATTR(rport, roles, S_IRUGO,
 808                 show_fc_rport_roles, NULL);
 809
 810 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 811 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 812
 813 /*
 814  * fast_io_fail_tmo attribute
 815  */
 816 static ssize_t
 817 show_fc_rport_fast_io_fail_tmo (struct class_device *cdev, char *buf)
 818 {
 819         struct fc_rport *rport = transport_class_to_rport(cdev);
 820
 821         if (rport->fast_io_fail_tmo == -1)
 822                 return snprintf(buf, 5, "off\n");
 823         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
 824 }
 825
 826 static ssize_t
 827 store_fc_rport_fast_io_fail_tmo(struct class_device *cdev, const char *buf,
 828                            size_t count)
 829 {
 830         int val;
 831         char *cp;
 832         struct fc_rport *rport = transport_class_to_rport(cdev);
 833
 834         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 835             (rport->port_state == FC_PORTSTATE_DELETED) ||
 836             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 837                 return -EBUSY;
 838         if (strncmp(buf, "off", 3) == 0)
 839                 rport->fast_io_fail_tmo = -1;
 840         else {
 841                 val = simple_strtoul(buf, &cp, 0);
 842                 if ((*cp && (*cp != '\n')) ||
 843                     (val < 0) || (val >= rport->dev_loss_tmo))
 844                         return -EINVAL;
 845                 rport->fast_io_fail_tmo = val;
 846         }
 847         return count;
 848 }
 849 static FC_CLASS_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
 850         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
 851
 852
 853 /*
 854  * FC SCSI Target Attribute Management
 855  */
 856
 857 /*
 858  * Note: in the target show function we recognize when the remote
 859  *  port is in the heirarchy and do not allow the driver to get
 860  *  involved in sysfs functions. The driver only gets involved if
 861  *  it's the "old" style that doesn't use rports.
 862  */
 863 #define fc_starget_show_function(field, format_string, sz, cast)        \
 864 static ssize_t                                                          \
 865 show_fc_starget_##field (struct class_device *cdev, char *buf)          \
 866 {                                                                       \
 867         struct scsi_target *starget = transport_class_to_starget(cdev); \
 868         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 869         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 870         struct fc_rport *rport = starget_to_rport(starget);             \
 871         if (rport)                                                      \
 872                 fc_starget_##field(starget) = rport->field;             \
 873         else if (i->f->get_starget_##field)                             \
 874                 i->f->get_starget_##field(starget);                     \
 875         return snprintf(buf, sz, format_string,                         \
 876                 cast fc_starget_##field(starget));                      \
 877 }
 878
 879 #define fc_starget_rd_attr(field, format_string, sz)                    \
 880         fc_starget_show_function(field, format_string, sz, )            \
 881 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 882                          show_fc_starget_##field, NULL)
 883
 884 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
 885         fc_starget_show_function(field, format_string, sz, (cast))      \
 886 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
 887                           show_fc_starget_##field, NULL)
 888
 889 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
 890         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 891         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
 892         i->private_starget_attrs[count].store = NULL;                   \
 893         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 894         if (i->f->show_starget_##field)                                 \
 895                 count++
 896
 897 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
 898         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
 899         if (!i->f->set_starget_##field) {                               \
 900                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
 901                 i->private_starget_attrs[count].store = NULL;           \
 902         }                                                               \
 903         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 904         if (i->f->show_starget_##field)                                 \
 905                 count++
 906
 907 /* The FC Transport SCSI Target Attributes: */
 908 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 909 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 910 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
 911
 912
 913 /*
 914  * Host Attribute Management
 915  */
 916
 917 #define fc_host_show_function(field, format_string, sz, cast)           \
 918 static ssize_t                                                          \
 919 show_fc_host_##field (struct class_device *cdev, char *buf)             \
 920 {                                                                       \
 921         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 922         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 923         if (i->f->get_host_##field)                                     \
 924                 i->f->get_host_##field(shost);                          \
 925         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
 926 }
 927
 928 #define fc_host_store_function(field)                                   \
 929 static ssize_t                                                          \
 930 store_fc_host_##field(struct class_device *cdev, const char *buf,       \
 931                            size_t count)                                \
 932 {                                                                       \
 933         int val;                                                        \
 934         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 935         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 936         char *cp;                                                       \
 937                                                                         \
 938         val = simple_strtoul(buf, &cp, 0);                              \
 939         if (*cp && (*cp != '\n'))                                       \
 940                 return -EINVAL;                                         \
 941         i->f->set_host_##field(shost, val);                             \
 942         return count;                                                   \
 943 }
 944
 945 #define fc_host_store_str_function(field, slen)                         \
 946 static ssize_t                                                          \
 947 store_fc_host_##field(struct class_device *cdev, const char *buf,       \
 948                            size_t count)                                \
 949 {                                                                       \
 950         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 951         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 952         unsigned int cnt=count;                                         \
 953                                                                         \
 954         /* count may include a LF at end of string */                   \
 955         if (buf[cnt-1] == '\n')                                         \
 956                 cnt--;                                                  \
 957         if (cnt > ((slen) - 1))                                         \
 958                 return -EINVAL;                                         \
 959         memcpy(fc_host_##field(shost), buf, cnt);                       \
 960         i->f->set_host_##field(shost);                                  \
 961         return count;                                                   \
 962 }
 963
 964 #define fc_host_rd_attr(field, format_string, sz)                       \
 965         fc_host_show_function(field, format_string, sz, )               \
 966 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 967                          show_fc_host_##field, NULL)
 968
 969 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
 970         fc_host_show_function(field, format_string, sz, (cast))         \
 971 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
 972                           show_fc_host_##field, NULL)
 973
 974 #define fc_host_rw_attr(field, format_string, sz)                       \
 975         fc_host_show_function(field, format_string, sz, )               \
 976         fc_host_store_function(field)                                   \
 977 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,             \
 978                         show_fc_host_##field,                           \
 979                         store_fc_host_##field)
 980
 981 #define fc_host_rd_enum_attr(title, maxlen)                             \
 982 static ssize_t                                                          \
 983 show_fc_host_##title (struct class_device *cdev, char *buf)             \
 984 {                                                                       \
 985         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
 986         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 987         const char *name;                                               \
 988         if (i->f->get_host_##title)                                     \
 989                 i->f->get_host_##title(shost);                          \
 990         name = get_fc_##title##_name(fc_host_##title(shost));           \
 991         if (!name)                                                      \
 992                 return -EINVAL;                                         \
 993         return snprintf(buf, maxlen, "%s\n", name);                     \
 994 }                                                                       \
 995 static FC_CLASS_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
 996
 997 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
 998         i->private_host_attrs[count] = class_device_attr_host_##field;  \
 999         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1000         i->private_host_attrs[count].store = NULL;                      \
1001         i->host_attrs[count] = &i->private_host_attrs[count];           \
1002         if (i->f->show_host_##field)                                    \
1003                 count++
1004
1005 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1006         i->private_host_attrs[count] = class_device_attr_host_##field;  \
1007         if (!i->f->set_host_##field) {                                  \
1008                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1009                 i->private_host_attrs[count].store = NULL;              \
1010         }                                                               \
1011         i->host_attrs[count] = &i->private_host_attrs[count];           \
1012         if (i->f->show_host_##field)                                    \
1013                 count++
1014
1015
1016 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1017 static ssize_t                                                          \
1018 show_fc_host_##field (struct class_device *cdev, char *buf)             \
1019 {                                                                       \
1020         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
1021         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1022 }
1023
1024 #define fc_private_host_rd_attr(field, format_string, sz)               \
1025         fc_private_host_show_function(field, format_string, sz, )       \
1026 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
1027                          show_fc_host_##field, NULL)
1028
1029 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1030         fc_private_host_show_function(field, format_string, sz, (cast)) \
1031 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
1032                           show_fc_host_##field, NULL)
1033
1034 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1035         i->private_host_attrs[count] = class_device_attr_host_##field;  \
1036         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1037         i->private_host_attrs[count].store = NULL;                      \
1038         i->host_attrs[count] = &i->private_host_attrs[count];           \
1039         count++
1040
1041 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1042 {                                                                       \
1043         i->private_host_attrs[count] = class_device_attr_host_##field;  \
1044         i->host_attrs[count] = &i->private_host_attrs[count];           \
1045         count++;                                                        \
1046 }
1047
1048
1049 /* Fixed Host Attributes */
1050
1051 static ssize_t
1052 show_fc_host_supported_classes (struct class_device *cdev, char *buf)
1053 {
1054         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1055
1056         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1057                 return snprintf(buf, 20, "unspecified\n");
1058
1059         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1060 }
1061 static FC_CLASS_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1062                 show_fc_host_supported_classes, NULL);
1063
1064 static ssize_t
1065 show_fc_host_supported_fc4s (struct class_device *cdev, char *buf)
1066 {
1067         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1068         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1069 }
1070 static FC_CLASS_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1071                 show_fc_host_supported_fc4s, NULL);
1072
1073 static ssize_t
1074 show_fc_host_supported_speeds (struct class_device *cdev, char *buf)
1075 {
1076         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1077
1078         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1079                 return snprintf(buf, 20, "unknown\n");
1080
1081         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1082 }
1083 static FC_CLASS_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1084                 show_fc_host_supported_speeds, NULL);
1085
1086
1087 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1088 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1089 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1090                              unsigned long long);
1091 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1092 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1093
1094
1095 /* Dynamic Host Attributes */
1096
1097 static ssize_t
1098 show_fc_host_active_fc4s (struct class_device *cdev, char *buf)
1099 {
1100         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1101         struct fc_internal *i = to_fc_internal(shost->transportt);
1102
1103         if (i->f->get_host_active_fc4s)
1104                 i->f->get_host_active_fc4s(shost);
1105
1106         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1107 }
1108 static FC_CLASS_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1109                 show_fc_host_active_fc4s, NULL);
1110
1111 static ssize_t
1112 show_fc_host_speed (struct class_device *cdev, char *buf)
1113 {
1114         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1115         struct fc_internal *i = to_fc_internal(shost->transportt);
1116
1117         if (i->f->get_host_speed)
1118                 i->f->get_host_speed(shost);
1119
1120         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1121                 return snprintf(buf, 20, "unknown\n");
1122
1123         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1124 }
1125 static FC_CLASS_DEVICE_ATTR(host, speed, S_IRUGO,
1126                 show_fc_host_speed, NULL);
1127
1128
1129 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1130 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1131 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1132 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1133 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1134
1135 fc_private_host_show_function(system_hostname, "%s\n",
1136                 FC_SYMBOLIC_NAME_SIZE + 1, )
1137 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1138 static FC_CLASS_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1139                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1140
1141
1142 /* Private Host Attributes */
1143
1144 static ssize_t
1145 show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
1146 {
1147         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1148         const char *name;
1149
1150         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1151         if (!name)
1152                 return -EINVAL;
1153         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1154 }
1155
1156 #define get_list_head_entry(pos, head, member)          \
1157         pos = list_entry((head)->next, typeof(*pos), member)
1158
1159 static ssize_t
1160 store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
1161         const char *buf, size_t count)
1162 {
1163         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1164         struct fc_rport *rport;
1165         enum fc_tgtid_binding_type val;
1166         unsigned long flags;
1167
1168         if (get_fc_tgtid_bind_type_match(buf, &val))
1169                 return -EINVAL;
1170
1171         /* if changing bind type, purge all unused consistent bindings */
1172         if (val != fc_host_tgtid_bind_type(shost)) {
1173                 spin_lock_irqsave(shost->host_lock, flags);
1174                 while (!list_empty(&fc_host_rport_bindings(shost))) {
1175                         get_list_head_entry(rport,
1176                                 &fc_host_rport_bindings(shost), peers);
1177                         list_del(&rport->peers);
1178                         rport->port_state = FC_PORTSTATE_DELETED;
1179                         fc_queue_work(shost, &rport->rport_delete_work);
1180                 }
1181                 spin_unlock_irqrestore(shost->host_lock, flags);
1182         }
1183
1184         fc_host_tgtid_bind_type(shost) = val;
1185         return count;
1186 }
1187
1188 static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1189                         show_fc_private_host_tgtid_bind_type,
1190                         store_fc_private_host_tgtid_bind_type);
1191
1192 static ssize_t
1193 store_fc_private_host_issue_lip(struct class_device *cdev,
1194         const char *buf, size_t count)
1195 {
1196         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1197         struct fc_internal *i = to_fc_internal(shost->transportt);
1198         int ret;
1199
1200         /* ignore any data value written to the attribute */
1201         if (i->f->issue_fc_host_lip) {
1202                 ret = i->f->issue_fc_host_lip(shost);
1203                 return ret ? ret: count;
1204         }
1205
1206         return -ENOENT;
1207 }
1208
1209 static FC_CLASS_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1210                         store_fc_private_host_issue_lip);
1211
1212 /*
1213  * Host Statistics Management
1214  */
1215
1216 /* Show a given an attribute in the statistics group */
1217 static ssize_t
1218 fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
1219 {
1220         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1221         struct fc_internal *i = to_fc_internal(shost->transportt);
1222         struct fc_host_statistics *stats;
1223         ssize_t ret = -ENOENT;
1224
1225         if (offset > sizeof(struct fc_host_statistics) ||
1226             offset % sizeof(u64) != 0)
1227                 WARN_ON(1);
1228
1229         if (i->f->get_fc_host_stats) {
1230                 stats = (i->f->get_fc_host_stats)(shost);
1231                 if (stats)
1232                         ret = snprintf(buf, 20, "0x%llx\n",
1233                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1234         }
1235         return ret;
1236 }
1237
1238
1239 /* generate a read-only statistics attribute */
1240 #define fc_host_statistic(name)                                         \
1241 static ssize_t show_fcstat_##name(struct class_device *cd, char *buf)   \
1242 {                                                                       \
1243         return fc_stat_show(cd, buf,                                    \
1244                             offsetof(struct fc_host_statistics, name)); \
1245 }                                                                       \
1246 static FC_CLASS_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1247
1248 fc_host_statistic(seconds_since_last_reset);
1249 fc_host_statistic(tx_frames);
1250 fc_host_statistic(tx_words);
1251 fc_host_statistic(rx_frames);
1252 fc_host_statistic(rx_words);
1253 fc_host_statistic(lip_count);
1254 fc_host_statistic(nos_count);
1255 fc_host_statistic(error_frames);
1256 fc_host_statistic(dumped_frames);
1257 fc_host_statistic(link_failure_count);
1258 fc_host_statistic(loss_of_sync_count);
1259 fc_host_statistic(loss_of_signal_count);
1260 fc_host_statistic(prim_seq_protocol_err_count);
1261 fc_host_statistic(invalid_tx_word_count);
1262 fc_host_statistic(invalid_crc_count);
1263 fc_host_statistic(fcp_input_requests);
1264 fc_host_statistic(fcp_output_requests);
1265 fc_host_statistic(fcp_control_requests);
1266 fc_host_statistic(fcp_input_megabytes);
1267 fc_host_statistic(fcp_output_megabytes);
1268
1269 static ssize_t
1270 fc_reset_statistics(struct class_device *cdev, const char *buf,
1271                            size_t count)
1272 {
1273         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1274         struct fc_internal *i = to_fc_internal(shost->transportt);
1275
1276         /* ignore any data value written to the attribute */
1277         if (i->f->reset_fc_host_stats) {
1278                 i->f->reset_fc_host_stats(shost);
1279                 return count;
1280         }
1281
1282         return -ENOENT;
1283 }
1284 static FC_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1285                                 fc_reset_statistics);
1286
1287
1288 static struct attribute *fc_statistics_attrs[] = {
1289         &class_device_attr_host_seconds_since_last_reset.attr,
1290         &class_device_attr_host_tx_frames.attr,
1291         &class_device_attr_host_tx_words.attr,
1292         &class_device_attr_host_rx_frames.attr,
1293         &class_device_attr_host_rx_words.attr,
1294         &class_device_attr_host_lip_count.attr,
1295         &class_device_attr_host_nos_count.attr,
1296         &class_device_attr_host_error_frames.attr,
1297         &class_device_attr_host_dumped_frames.attr,
1298         &class_device_attr_host_link_failure_count.attr,
1299         &class_device_attr_host_loss_of_sync_count.attr,
1300         &class_device_attr_host_loss_of_signal_count.attr,
1301         &class_device_attr_host_prim_seq_protocol_err_count.attr,
1302         &class_device_attr_host_invalid_tx_word_count.attr,
1303         &class_device_attr_host_invalid_crc_count.attr,
1304         &class_device_attr_host_fcp_input_requests.attr,
1305         &class_device_attr_host_fcp_output_requests.attr,
1306         &class_device_attr_host_fcp_control_requests.attr,
1307         &class_device_attr_host_fcp_input_megabytes.attr,
1308         &class_device_attr_host_fcp_output_megabytes.attr,
1309         &class_device_attr_host_reset_statistics.attr,
1310         NULL
1311 };
1312
1313 static struct attribute_group fc_statistics_group = {
1314         .name = "statistics",
1315         .attrs = fc_statistics_attrs,
1316 };
1317
1318 static int fc_host_match(struct attribute_container *cont,
1319                           struct device *dev)
1320 {
1321         struct Scsi_Host *shost;
1322         struct fc_internal *i;
1323
1324         if (!scsi_is_host_device(dev))
1325                 return 0;
1326
1327         shost = dev_to_shost(dev);
1328         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1329             != &fc_host_class.class)
1330                 return 0;
1331
1332         i = to_fc_internal(shost->transportt);
1333
1334         return &i->t.host_attrs.ac == cont;
1335 }
1336
1337 static int fc_target_match(struct attribute_container *cont,
1338                             struct device *dev)
1339 {
1340         struct Scsi_Host *shost;
1341         struct fc_internal *i;
1342
1343         if (!scsi_is_target_device(dev))
1344                 return 0;
1345
1346         shost = dev_to_shost(dev->parent);
1347         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1348             != &fc_host_class.class)
1349                 return 0;
1350
1351         i = to_fc_internal(shost->transportt);
1352
1353         return &i->t.target_attrs.ac == cont;
1354 }
1355
1356 static void fc_rport_dev_release(struct device *dev)
1357 {
1358         struct fc_rport *rport = dev_to_rport(dev);
1359         put_device(dev->parent);
1360         kfree(rport);
1361 }
1362
1363 int scsi_is_fc_rport(const struct device *dev)
1364 {
1365         return dev->release == fc_rport_dev_release;
1366 }
1367 EXPORT_SYMBOL(scsi_is_fc_rport);
1368
1369 static int fc_rport_match(struct attribute_container *cont,
1370                             struct device *dev)
1371 {
1372         struct Scsi_Host *shost;
1373         struct fc_internal *i;
1374
1375         if (!scsi_is_fc_rport(dev))
1376                 return 0;
1377
1378         shost = dev_to_shost(dev->parent);
1379         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1380             != &fc_host_class.class)
1381                 return 0;
1382
1383         i = to_fc_internal(shost->transportt);
1384
1385         return &i->rport_attr_cont.ac == cont;
1386 }
1387
1388
1389 /**
1390  * fc_timed_out - FC Transport I/O timeout intercept handler
1391  *
1392  * @scmd:       The SCSI command which timed out
1393  *
1394  * This routine protects against error handlers getting invoked while a
1395  * rport is in a blocked state, typically due to a temporarily loss of
1396  * connectivity. If the error handlers are allowed to proceed, requests
1397  * to abort i/o, reset the target, etc will likely fail as there is no way
1398  * to communicate with the device to perform the requested function. These
1399  * failures may result in the midlayer taking the device offline, requiring
1400  * manual intervention to restore operation.
1401  *
1402  * This routine, called whenever an i/o times out, validates the state of
1403  * the underlying rport. If the rport is blocked, it returns
1404  * EH_RESET_TIMER, which will continue to reschedule the timeout.
1405  * Eventually, either the device will return, or devloss_tmo will fire,
1406  * and when the timeout then fires, it will be handled normally.
1407  * If the rport is not blocked, normal error handling continues.
1408  *
1409  * Notes:
1410  *      This routine assumes no locks are held on entry.
1411  **/
1412 static enum scsi_eh_timer_return
1413 fc_timed_out(struct scsi_cmnd *scmd)
1414 {
1415         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1416
1417         if (rport->port_state == FC_PORTSTATE_BLOCKED)
1418                 return EH_RESET_TIMER;
1419
1420         return EH_NOT_HANDLED;
1421 }
1422
1423 /*
1424  * Must be called with shost->host_lock held
1425  */
1426 static int fc_user_scan(struct Scsi_Host *shost, uint channel,
1427                 uint id, uint lun)
1428 {
1429         struct fc_rport *rport;
1430
1431         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1432                 if (rport->scsi_target_id == -1)
1433                         continue;
1434
1435                 if ((channel == SCAN_WILD_CARD || channel == rport->channel) &&
1436                     (id == SCAN_WILD_CARD || id == rport->scsi_target_id)) {
1437                         scsi_scan_target(&rport->dev, rport->channel,
1438                                          rport->scsi_target_id, lun, 1);
1439                 }
1440         }
1441
1442         return 0;
1443 }
1444
1445 struct scsi_transport_template *
1446 fc_attach_transport(struct fc_function_template *ft)
1447 {
1448         int count;
1449         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
1450                                         GFP_KERNEL);
1451
1452         if (unlikely(!i))
1453                 return NULL;
1454
1455         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
1456         i->t.target_attrs.ac.class = &fc_transport_class.class;
1457         i->t.target_attrs.ac.match = fc_target_match;
1458         i->t.target_size = sizeof(struct fc_starget_attrs);
1459         transport_container_register(&i->t.target_attrs);
1460
1461         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1462         i->t.host_attrs.ac.class = &fc_host_class.class;
1463         i->t.host_attrs.ac.match = fc_host_match;
1464         i->t.host_size = sizeof(struct fc_host_attrs);
1465         if (ft->get_fc_host_stats)
1466                 i->t.host_attrs.statistics = &fc_statistics_group;
1467         transport_container_register(&i->t.host_attrs);
1468
1469         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
1470         i->rport_attr_cont.ac.class = &fc_rport_class.class;
1471         i->rport_attr_cont.ac.match = fc_rport_match;
1472         transport_container_register(&i->rport_attr_cont);
1473
1474         i->f = ft;
1475
1476         /* Transport uses the shost workq for scsi scanning */
1477         i->t.create_work_queue = 1;
1478
1479         i->t.eh_timed_out = fc_timed_out;
1480
1481         i->t.user_scan = fc_user_scan;
1482
1483         /*
1484          * Setup SCSI Target Attributes.
1485          */
1486         count = 0;
1487         SETUP_STARGET_ATTRIBUTE_RD(node_name);
1488         SETUP_STARGET_ATTRIBUTE_RD(port_name);
1489         SETUP_STARGET_ATTRIBUTE_RD(port_id);
1490
1491         BUG_ON(count > FC_STARGET_NUM_ATTRS);
1492
1493         i->starget_attrs[count] = NULL;
1494
1495
1496         /*
1497          * Setup SCSI Host Attributes.
1498          */
1499         count=0;
1500         SETUP_HOST_ATTRIBUTE_RD(node_name);
1501         SETUP_HOST_ATTRIBUTE_RD(port_name);
1502         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
1503         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
1504         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
1505         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
1506         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
1507         SETUP_HOST_ATTRIBUTE_RD(serial_number);
1508
1509         SETUP_HOST_ATTRIBUTE_RD(port_id);
1510         SETUP_HOST_ATTRIBUTE_RD(port_type);
1511         SETUP_HOST_ATTRIBUTE_RD(port_state);
1512         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
1513         SETUP_HOST_ATTRIBUTE_RD(speed);
1514         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
1515         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
1516         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
1517
1518         /* Transport-managed attributes */
1519         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
1520         if (ft->issue_fc_host_lip)
1521                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
1522
1523         BUG_ON(count > FC_HOST_NUM_ATTRS);
1524
1525         i->host_attrs[count] = NULL;
1526
1527         /*
1528          * Setup Remote Port Attributes.
1529          */
1530         count=0;
1531         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
1532         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
1533         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
1534         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
1535         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
1536         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
1537         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
1538         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
1539         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
1540         if (ft->terminate_rport_io)
1541                 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
1542
1543         BUG_ON(count > FC_RPORT_NUM_ATTRS);
1544
1545         i->rport_attrs[count] = NULL;
1546
1547         return &i->t;
1548 }
1549 EXPORT_SYMBOL(fc_attach_transport);
1550
1551 void fc_release_transport(struct scsi_transport_template *t)
1552 {
1553         struct fc_internal *i = to_fc_internal(t);
1554
1555         transport_container_unregister(&i->t.target_attrs);
1556         transport_container_unregister(&i->t.host_attrs);
1557         transport_container_unregister(&i->rport_attr_cont);
1558
1559         kfree(i);
1560 }
1561 EXPORT_SYMBOL(fc_release_transport);
1562
1563 /**
1564  * fc_queue_work - Queue work to the fc_host workqueue.
1565  * @shost:      Pointer to Scsi_Host bound to fc_host.
1566  * @work:       Work to queue for execution.
1567  *
1568  * Return value:
1569  *      1 - work queued for execution
1570  *      0 - work is already queued
1571  *      -EINVAL - work queue doesn't exist
1572  **/
1573 static int
1574 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
1575 {
1576         if (unlikely(!fc_host_work_q(shost))) {
1577                 printk(KERN_ERR
1578                         "ERROR: FC host '%s' attempted to queue work, "
1579                         "when no workqueue created.\n", shost->hostt->name);
1580                 dump_stack();
1581
1582                 return -EINVAL;
1583         }
1584
1585         return queue_work(fc_host_work_q(shost), work);
1586 }
1587
1588 /**
1589  * fc_flush_work - Flush a fc_host's workqueue.
1590  * @shost:      Pointer to Scsi_Host bound to fc_host.
1591  **/
1592 static void
1593 fc_flush_work(struct Scsi_Host *shost)
1594 {
1595         if (!fc_host_work_q(shost)) {
1596                 printk(KERN_ERR
1597                         "ERROR: FC host '%s' attempted to flush work, "
1598                         "when no workqueue created.\n", shost->hostt->name);
1599                 dump_stack();
1600                 return;
1601         }
1602
1603         flush_workqueue(fc_host_work_q(shost));
1604 }
1605
1606 /**
1607  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
1608  * @shost:      Pointer to Scsi_Host bound to fc_host.
1609  * @work:       Work to queue for execution.
1610  * @delay:      jiffies to delay the work queuing
1611  *
1612  * Return value:
1613  *      1 on success / 0 already queued / < 0 for error
1614  **/
1615 static int
1616 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
1617                                 unsigned long delay)
1618 {
1619         if (unlikely(!fc_host_devloss_work_q(shost))) {
1620                 printk(KERN_ERR
1621                         "ERROR: FC host '%s' attempted to queue work, "
1622                         "when no workqueue created.\n", shost->hostt->name);
1623                 dump_stack();
1624
1625                 return -EINVAL;
1626         }
1627
1628         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
1629 }
1630
1631 /**
1632  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
1633  * @shost:      Pointer to Scsi_Host bound to fc_host.
1634  **/
1635 static void
1636 fc_flush_devloss(struct Scsi_Host *shost)
1637 {
1638         if (!fc_host_devloss_work_q(shost)) {
1639                 printk(KERN_ERR
1640                         "ERROR: FC host '%s' attempted to flush work, "
1641                         "when no workqueue created.\n", shost->hostt->name);
1642                 dump_stack();
1643                 return;
1644         }
1645
1646         flush_workqueue(fc_host_devloss_work_q(shost));
1647 }
1648
1649
1650 /**
1651  * fc_remove_host - called to terminate any fc_transport-related elements
1652  *                  for a scsi host.
1653  * @rport:      remote port to be unblocked.
1654  *
1655  * This routine is expected to be called immediately preceeding the
1656  * a driver's call to scsi_remove_host().
1657  *
1658  * WARNING: A driver utilizing the fc_transport, which fails to call
1659  *   this routine prior to scsi_remote_host(), will leave dangling
1660  *   objects in /sys/class/fc_remote_ports. Access to any of these
1661  *   objects can result in a system crash !!!
1662  *
1663  * Notes:
1664  *      This routine assumes no locks are held on entry.
1665  **/
1666 void
1667 fc_remove_host(struct Scsi_Host *shost)
1668 {
1669         struct fc_rport *rport, *next_rport;
1670         struct workqueue_struct *work_q;
1671         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1672
1673         /* Remove any remote ports */
1674         list_for_each_entry_safe(rport, next_rport,
1675                         &fc_host->rports, peers) {
1676                 list_del(&rport->peers);
1677                 rport->port_state = FC_PORTSTATE_DELETED;
1678                 fc_queue_work(shost, &rport->rport_delete_work);
1679         }
1680
1681         list_for_each_entry_safe(rport, next_rport,
1682                         &fc_host->rport_bindings, peers) {
1683                 list_del(&rport->peers);
1684                 rport->port_state = FC_PORTSTATE_DELETED;
1685                 fc_queue_work(shost, &rport->rport_delete_work);
1686         }
1687
1688         /* flush all scan work items */
1689         scsi_flush_work(shost);
1690
1691         /* flush all stgt delete, and rport delete work items, then kill it  */
1692         if (fc_host->work_q) {
1693                 work_q = fc_host->work_q;
1694                 fc_host->work_q = NULL;
1695                 destroy_workqueue(work_q);
1696         }
1697
1698         /* flush all devloss work items, then kill it  */
1699         if (fc_host->devloss_work_q) {
1700                 work_q = fc_host->devloss_work_q;
1701                 fc_host->devloss_work_q = NULL;
1702                 destroy_workqueue(work_q);
1703         }
1704 }
1705 EXPORT_SYMBOL(fc_remove_host);
1706
1707
1708 /**
1709  * fc_starget_delete - called to delete the scsi decendents of an rport
1710  *                  (target and all sdevs)
1711  *
1712  * @work:       remote port to be operated on.
1713  **/
1714 static void
1715 fc_starget_delete(struct work_struct *work)
1716 {
1717         struct fc_rport *rport =
1718                 container_of(work, struct fc_rport, stgt_delete_work);
1719         struct Scsi_Host *shost = rport_to_shost(rport);
1720         unsigned long flags;
1721         struct fc_internal *i = to_fc_internal(shost->transportt);
1722
1723         /*
1724          * Involve the LLDD if possible. All io on the rport is to
1725          * be terminated, either as part of the dev_loss_tmo callback
1726          * processing, or via the terminate_rport_io function.
1727          */
1728         if (i->f->dev_loss_tmo_callbk)
1729                 i->f->dev_loss_tmo_callbk(rport);
1730         else if (i->f->terminate_rport_io)
1731                 i->f->terminate_rport_io(rport);
1732
1733         spin_lock_irqsave(shost->host_lock, flags);
1734         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
1735                 spin_unlock_irqrestore(shost->host_lock, flags);
1736                 if (!cancel_delayed_work(&rport->fail_io_work))
1737                         fc_flush_devloss(shost);
1738                 if (!cancel_delayed_work(&rport->dev_loss_work))
1739                         fc_flush_devloss(shost);
1740                 spin_lock_irqsave(shost->host_lock, flags);
1741                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
1742         }
1743         spin_unlock_irqrestore(shost->host_lock, flags);
1744
1745         scsi_remove_target(&rport->dev);
1746 }
1747
1748
1749 /**
1750  * fc_rport_final_delete - finish rport termination and delete it.
1751  *
1752  * @work:       remote port to be deleted.
1753  **/
1754 static void
1755 fc_rport_final_delete(struct work_struct *work)
1756 {
1757         struct fc_rport *rport =
1758                 container_of(work, struct fc_rport, rport_delete_work);
1759         struct device *dev = &rport->dev;
1760         struct Scsi_Host *shost = rport_to_shost(rport);
1761         struct fc_internal *i = to_fc_internal(shost->transportt);
1762
1763         /*
1764          * if a scan is pending, flush the SCSI Host work_q so that
1765          * that we can reclaim the rport scan work element.
1766          */
1767         if (rport->flags & FC_RPORT_SCAN_PENDING)
1768                 scsi_flush_work(shost);
1769
1770         /* Delete SCSI target and sdevs */
1771         if (rport->scsi_target_id != -1)
1772                 fc_starget_delete(&rport->stgt_delete_work);
1773         else if (i->f->dev_loss_tmo_callbk)
1774                 i->f->dev_loss_tmo_callbk(rport);
1775         else if (i->f->terminate_rport_io)
1776                 i->f->terminate_rport_io(rport);
1777
1778         transport_remove_device(dev);
1779         device_del(dev);
1780         transport_destroy_device(dev);
1781         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
1782         put_device(dev);                        /* for self-reference */
1783 }
1784
1785
1786 /**
1787  * fc_rport_create - allocates and creates a remote FC port.
1788  * @shost:      scsi host the remote port is connected to.
1789  * @channel:    Channel on shost port connected to.
1790  * @ids:        The world wide names, fc address, and FC4 port
1791  *              roles for the remote port.
1792  *
1793  * Allocates and creates the remoter port structure, including the
1794  * class and sysfs creation.
1795  *
1796  * Notes:
1797  *      This routine assumes no locks are held on entry.
1798  **/
1799 struct fc_rport *
1800 fc_rport_create(struct Scsi_Host *shost, int channel,
1801         struct fc_rport_identifiers  *ids)
1802 {
1803         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1804         struct fc_internal *fci = to_fc_internal(shost->transportt);
1805         struct fc_rport *rport;
1806         struct device *dev;
1807         unsigned long flags;
1808         int error;
1809         size_t size;
1810
1811         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
1812         rport = kzalloc(size, GFP_KERNEL);
1813         if (unlikely(!rport)) {
1814                 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
1815                 return NULL;
1816         }
1817
1818         rport->maxframe_size = -1;
1819         rport->supported_classes = FC_COS_UNSPECIFIED;
1820         rport->dev_loss_tmo = fc_dev_loss_tmo;
1821         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
1822         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
1823         rport->port_id = ids->port_id;
1824         rport->roles = ids->roles;
1825         rport->port_state = FC_PORTSTATE_ONLINE;
1826         if (fci->f->dd_fcrport_size)
1827                 rport->dd_data = &rport[1];
1828         rport->channel = channel;
1829         rport->fast_io_fail_tmo = -1;
1830
1831         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
1832         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
1833         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
1834         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
1835         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
1836
1837         spin_lock_irqsave(shost->host_lock, flags);
1838
1839         rport->number = fc_host->next_rport_number++;
1840         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1841                 rport->scsi_target_id = fc_host->next_target_id++;
1842         else
1843                 rport->scsi_target_id = -1;
1844         list_add_tail(&rport->peers, &fc_host->rports);
1845         get_device(&shost->shost_gendev);       /* for fc_host->rport list */
1846
1847         spin_unlock_irqrestore(shost->host_lock, flags);
1848
1849         dev = &rport->dev;
1850         device_initialize(dev);                 /* takes self reference */
1851         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
1852         dev->release = fc_rport_dev_release;
1853         sprintf(dev->bus_id, "rport-%d:%d-%d",
1854                 shost->host_no, channel, rport->number);
1855         transport_setup_device(dev);
1856
1857         error = device_add(dev);
1858         if (error) {
1859                 printk(KERN_ERR "FC Remote Port device_add failed\n");
1860                 goto delete_rport;
1861         }
1862         transport_add_device(dev);
1863         transport_configure_device(dev);
1864
1865         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET) {
1866                 /* initiate a scan of the target */
1867                 rport->flags |= FC_RPORT_SCAN_PENDING;
1868                 scsi_queue_work(shost, &rport->scan_work);
1869         }
1870
1871         return rport;
1872
1873 delete_rport:
1874         transport_destroy_device(dev);
1875         spin_lock_irqsave(shost->host_lock, flags);
1876         list_del(&rport->peers);
1877         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
1878         spin_unlock_irqrestore(shost->host_lock, flags);
1879         put_device(dev->parent);
1880         kfree(rport);
1881         return NULL;
1882 }
1883
1884 /**
1885  * fc_remote_port_add - notifies the fc transport of the existence
1886  *              of a remote FC port.
1887  * @shost:      scsi host the remote port is connected to.
1888  * @channel:    Channel on shost port connected to.
1889  * @ids:        The world wide names, fc address, and FC4 port
1890  *              roles for the remote port.
1891  *
1892  * The LLDD calls this routine to notify the transport of the existence
1893  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
1894  * of the port, it's FC address (port_id), and the FC4 roles that are
1895  * active for the port.
1896  *
1897  * For ports that are FCP targets (aka scsi targets), the FC transport
1898  * maintains consistent target id bindings on behalf of the LLDD.
1899  * A consistent target id binding is an assignment of a target id to
1900  * a remote port identifier, which persists while the scsi host is
1901  * attached. The remote port can disappear, then later reappear, and
1902  * it's target id assignment remains the same. This allows for shifts
1903  * in FC addressing (if binding by wwpn or wwnn) with no apparent
1904  * changes to the scsi subsystem which is based on scsi host number and
1905  * target id values.  Bindings are only valid during the attachment of
1906  * the scsi host. If the host detaches, then later re-attaches, target
1907  * id bindings may change.
1908  *
1909  * This routine is responsible for returning a remote port structure.
1910  * The routine will search the list of remote ports it maintains
1911  * internally on behalf of consistent target id mappings. If found, the
1912  * remote port structure will be reused. Otherwise, a new remote port
1913  * structure will be allocated.
1914  *
1915  * Whenever a remote port is allocated, a new fc_remote_port class
1916  * device is created.
1917  *
1918  * Should not be called from interrupt context.
1919  *
1920  * Notes:
1921  *      This routine assumes no locks are held on entry.
1922  **/
1923 struct fc_rport *
1924 fc_remote_port_add(struct Scsi_Host *shost, int channel,
1925         struct fc_rport_identifiers  *ids)
1926 {
1927         struct fc_internal *fci = to_fc_internal(shost->transportt);
1928         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1929         struct fc_rport *rport;
1930         unsigned long flags;
1931         int match = 0;
1932
1933         /* ensure any stgt delete functions are done */
1934         fc_flush_work(shost);
1935
1936         /*
1937          * Search the list of "active" rports, for an rport that has been
1938          * deleted, but we've held off the real delete while the target
1939          * is in a "blocked" state.
1940          */
1941         spin_lock_irqsave(shost->host_lock, flags);
1942
1943         list_for_each_entry(rport, &fc_host->rports, peers) {
1944
1945                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
1946                         (rport->channel == channel)) {
1947
1948                         switch (fc_host->tgtid_bind_type) {
1949                         case FC_TGTID_BIND_BY_WWPN:
1950                         case FC_TGTID_BIND_NONE:
1951                                 if (rport->port_name == ids->port_name)
1952                                         match = 1;
1953                                 break;
1954                         case FC_TGTID_BIND_BY_WWNN:
1955                                 if (rport->node_name == ids->node_name)
1956                                         match = 1;
1957                                 break;
1958                         case FC_TGTID_BIND_BY_ID:
1959                                 if (rport->port_id == ids->port_id)
1960                                         match = 1;
1961                                 break;
1962                         }
1963
1964                         if (match) {
1965                                 struct delayed_work *work =
1966                                                         &rport->dev_loss_work;
1967
1968                                 memcpy(&rport->node_name, &ids->node_name,
1969                                         sizeof(rport->node_name));
1970                                 memcpy(&rport->port_name, &ids->port_name,
1971                                         sizeof(rport->port_name));
1972                                 rport->port_id = ids->port_id;
1973
1974                                 rport->port_state = FC_PORTSTATE_ONLINE;
1975                                 rport->roles = ids->roles;
1976
1977                                 spin_unlock_irqrestore(shost->host_lock, flags);
1978
1979                                 if (fci->f->dd_fcrport_size)
1980                                         memset(rport->dd_data, 0,
1981                                                 fci->f->dd_fcrport_size);
1982
1983                                 /*
1984                                  * If we were blocked, we were a target.
1985                                  * If no longer a target, we leave the timer
1986                                  * running in case the port changes roles
1987                                  * prior to the timer expiring. If the timer
1988                                  * fires, the target will be torn down.
1989                                  */
1990                                 if (!(ids->roles & FC_RPORT_ROLE_FCP_TARGET))
1991                                         return rport;
1992
1993                                 /* restart the target */
1994
1995                                 /*
1996                                  * Stop the target timers first. Take no action
1997                                  * on the del_timer failure as the state
1998                                  * machine state change will validate the
1999                                  * transaction.
2000                                  */
2001                                 if (!cancel_delayed_work(&rport->fail_io_work))
2002                                         fc_flush_devloss(shost);
2003                                 if (!cancel_delayed_work(work))
2004                                         fc_flush_devloss(shost);
2005
2006                                 spin_lock_irqsave(shost->host_lock, flags);
2007
2008                                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2009
2010                                 /* initiate a scan of the target */
2011                                 rport->flags |= FC_RPORT_SCAN_PENDING;
2012                                 scsi_queue_work(shost, &rport->scan_work);
2013
2014                                 spin_unlock_irqrestore(shost->host_lock, flags);
2015
2016                                 scsi_target_unblock(&rport->dev);
2017
2018                                 return rport;
2019                         }
2020                 }
2021         }
2022
2023         /* Search the bindings array */
2024         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2025
2026                 /* search for a matching consistent binding */
2027
2028                 list_for_each_entry(rport, &fc_host->rport_bindings,
2029                                         peers) {
2030                         if (rport->channel != channel)
2031                                 continue;
2032
2033                         switch (fc_host->tgtid_bind_type) {
2034                         case FC_TGTID_BIND_BY_WWPN:
2035                                 if (rport->port_name == ids->port_name)
2036                                         match = 1;
2037                                 break;
2038                         case FC_TGTID_BIND_BY_WWNN:
2039                                 if (rport->node_name == ids->node_name)
2040                                         match = 1;
2041                                 break;
2042                         case FC_TGTID_BIND_BY_ID:
2043                                 if (rport->port_id == ids->port_id)
2044                                         match = 1;
2045                                 break;
2046                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2047                                 break;
2048                         }
2049
2050                         if (match) {
2051                                 list_move_tail(&rport->peers, &fc_host->rports);
2052                                 break;
2053                         }
2054                 }
2055
2056                 if (match) {
2057                         memcpy(&rport->node_name, &ids->node_name,
2058                                 sizeof(rport->node_name));
2059                         memcpy(&rport->port_name, &ids->port_name,
2060                                 sizeof(rport->port_name));
2061                         rport->port_id = ids->port_id;
2062                         rport->roles = ids->roles;
2063                         rport->port_state = FC_PORTSTATE_ONLINE;
2064
2065                         if (fci->f->dd_fcrport_size)
2066                                 memset(rport->dd_data, 0,
2067                                                 fci->f->dd_fcrport_size);
2068
2069                         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET) {
2070                                 /* initiate a scan of the target */
2071                                 rport->flags |= FC_RPORT_SCAN_PENDING;
2072                                 scsi_queue_work(shost, &rport->scan_work);
2073                                 spin_unlock_irqrestore(shost->host_lock, flags);
2074                                 scsi_target_unblock(&rport->dev);
2075                         } else
2076                                 spin_unlock_irqrestore(shost->host_lock, flags);
2077
2078                         return rport;
2079                 }
2080         }
2081
2082         spin_unlock_irqrestore(shost->host_lock, flags);
2083
2084         /* No consistent binding found - create new remote port entry */
2085         rport = fc_rport_create(shost, channel, ids);
2086
2087         return rport;
2088 }
2089 EXPORT_SYMBOL(fc_remote_port_add);
2090
2091
2092 /**
2093  * fc_remote_port_delete - notifies the fc transport that a remote
2094  *              port is no longer in existence.
2095  * @rport:      The remote port that no longer exists
2096  *
2097  * The LLDD calls this routine to notify the transport that a remote
2098  * port is no longer part of the topology. Note: Although a port
2099  * may no longer be part of the topology, it may persist in the remote
2100  * ports displayed by the fc_host. We do this under 2 conditions:
2101  * - If the port was a scsi target, we delay its deletion by "blocking" it.
2102  *   This allows the port to temporarily disappear, then reappear without
2103  *   disrupting the SCSI device tree attached to it. During the "blocked"
2104  *   period the port will still exist.
2105  * - If the port was a scsi target and disappears for longer than we
2106  *   expect, we'll delete the port and the tear down the SCSI device tree
2107  *   attached to it. However, we want to semi-persist the target id assigned
2108  *   to that port if it eventually does exist. The port structure will
2109  *   remain (although with minimal information) so that the target id
2110  *   bindings remails.
2111  *
2112  * If the remote port is not an FCP Target, it will be fully torn down
2113  * and deallocated, including the fc_remote_port class device.
2114  *
2115  * If the remote port is an FCP Target, the port will be placed in a
2116  * temporary blocked state. From the LLDD's perspective, the rport no
2117  * longer exists. From the SCSI midlayer's perspective, the SCSI target
2118  * exists, but all sdevs on it are blocked from further I/O. The following
2119  * is then expected:
2120  *   If the remote port does not return (signaled by a LLDD call to
2121  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2122  *   scsi target is removed - killing all outstanding i/o and removing the
2123  *   scsi devices attached ot it. The port structure will be marked Not
2124  *   Present and be partially cleared, leaving only enough information to
2125  *   recognize the remote port relative to the scsi target id binding if
2126  *   it later appears.  The port will remain as long as there is a valid
2127  *   binding (e.g. until the user changes the binding type or unloads the
2128  *   scsi host with the binding).
2129  *
2130  *   If the remote port returns within the dev_loss_tmo value (and matches
2131  *   according to the target id binding type), the port structure will be
2132  *   reused. If it is no longer a SCSI target, the target will be torn
2133  *   down. If it continues to be a SCSI target, then the target will be
2134  *   unblocked (allowing i/o to be resumed), and a scan will be activated
2135  *   to ensure that all luns are detected.
2136  *
2137  * Called from normal process context only - cannot be called from interrupt.
2138  *
2139  * Notes:
2140  *      This routine assumes no locks are held on entry.
2141  **/
2142 void
2143 fc_remote_port_delete(struct fc_rport  *rport)
2144 {
2145         struct Scsi_Host *shost = rport_to_shost(rport);
2146         struct fc_internal *i = to_fc_internal(shost->transportt);
2147         int timeout = rport->dev_loss_tmo;
2148         unsigned long flags;
2149
2150         /*
2151          * No need to flush the fc_host work_q's, as all adds are synchronous.
2152          *
2153          * We do need to reclaim the rport scan work element, so eventually
2154          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2155          * there's still a scan pending.
2156          */
2157
2158         spin_lock_irqsave(shost->host_lock, flags);
2159
2160         /* If no scsi target id mapping, delete it */
2161         if (rport->scsi_target_id == -1) {
2162                 list_del(&rport->peers);
2163                 rport->port_state = FC_PORTSTATE_DELETED;
2164                 fc_queue_work(shost, &rport->rport_delete_work);
2165                 spin_unlock_irqrestore(shost->host_lock, flags);
2166                 return;
2167         }
2168
2169         rport->port_state = FC_PORTSTATE_BLOCKED;
2170
2171         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2172
2173         spin_unlock_irqrestore(shost->host_lock, flags);
2174
2175         scsi_target_block(&rport->dev);
2176
2177         /* see if we need to kill io faster than waiting for device loss */
2178         if ((rport->fast_io_fail_tmo != -1) &&
2179             (rport->fast_io_fail_tmo < timeout) && (i->f->terminate_rport_io))
2180                 fc_queue_devloss_work(shost, &rport->fail_io_work,
2181                                         rport->fast_io_fail_tmo * HZ);
2182
2183         /* cap the length the devices can be blocked until they are deleted */
2184         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2185 }
2186 EXPORT_SYMBOL(fc_remote_port_delete);
2187
2188 /**
2189  * fc_remote_port_rolechg - notifies the fc transport that the roles
2190  *              on a remote may have changed.
2191  * @rport:      The remote port that changed.
2192  *
2193  * The LLDD calls this routine to notify the transport that the roles
2194  * on a remote port may have changed. The largest effect of this is
2195  * if a port now becomes a FCP Target, it must be allocated a
2196  * scsi target id.  If the port is no longer a FCP target, any
2197  * scsi target id value assigned to it will persist in case the
2198  * role changes back to include FCP Target. No changes in the scsi
2199  * midlayer will be invoked if the role changes (in the expectation
2200  * that the role will be resumed. If it doesn't normal error processing
2201  * will take place).
2202  *
2203  * Should not be called from interrupt context.
2204  *
2205  * Notes:
2206  *      This routine assumes no locks are held on entry.
2207  **/
2208 void
2209 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
2210 {
2211         struct Scsi_Host *shost = rport_to_shost(rport);
2212         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2213         unsigned long flags;
2214         int create = 0;
2215
2216         spin_lock_irqsave(shost->host_lock, flags);
2217         if (roles & FC_RPORT_ROLE_FCP_TARGET) {
2218                 if (rport->scsi_target_id == -1) {
2219                         rport->scsi_target_id = fc_host->next_target_id++;
2220                         create = 1;
2221                 } else if (!(rport->roles & FC_RPORT_ROLE_FCP_TARGET))
2222                         create = 1;
2223         }
2224
2225         rport->roles = roles;
2226
2227         spin_unlock_irqrestore(shost->host_lock, flags);
2228
2229         if (create) {
2230                 /*
2231                  * There may have been a delete timer running on the
2232                  * port. Ensure that it is cancelled as we now know
2233                  * the port is an FCP Target.
2234                  * Note: we know the rport is exists and in an online
2235                  *  state as the LLDD would not have had an rport
2236                  *  reference to pass us.
2237                  *
2238                  * Take no action on the del_timer failure as the state
2239                  * machine state change will validate the
2240                  * transaction.
2241                  */
2242                 if (!cancel_delayed_work(&rport->fail_io_work))
2243                         fc_flush_devloss(shost);
2244                 if (!cancel_delayed_work(&rport->dev_loss_work))
2245                         fc_flush_devloss(shost);
2246
2247                 spin_lock_irqsave(shost->host_lock, flags);
2248                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2249                 spin_unlock_irqrestore(shost->host_lock, flags);
2250
2251                 /* ensure any stgt delete functions are done */
2252                 fc_flush_work(shost);
2253
2254                 /* initiate a scan of the target */
2255                 spin_lock_irqsave(shost->host_lock, flags);
2256                 rport->flags |= FC_RPORT_SCAN_PENDING;
2257                 scsi_queue_work(shost, &rport->scan_work);
2258                 spin_unlock_irqrestore(shost->host_lock, flags);
2259                 scsi_target_unblock(&rport->dev);
2260         }
2261 }
2262 EXPORT_SYMBOL(fc_remote_port_rolechg);
2263
2264 /**
2265  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port that
2266  *                       was a SCSI target (thus was blocked), and failed
2267  *                       to return in the alloted time.
2268  *
2269  * @work:       rport target that failed to reappear in the alloted time.
2270  **/
2271 static void
2272 fc_timeout_deleted_rport(struct work_struct *work)
2273 {
2274         struct fc_rport *rport =
2275                 container_of(work, struct fc_rport, dev_loss_work.work);
2276         struct Scsi_Host *shost = rport_to_shost(rport);
2277         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2278         unsigned long flags;
2279
2280         spin_lock_irqsave(shost->host_lock, flags);
2281
2282         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2283
2284         /*
2285          * If the port is ONLINE, then it came back. Validate it's still an
2286          * FCP target. If not, tear down the scsi_target on it.
2287          */
2288         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
2289             !(rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
2290                 dev_printk(KERN_ERR, &rport->dev,
2291                         "blocked FC remote port time out: no longer"
2292                         " a FCP target, removing starget\n");
2293                 spin_unlock_irqrestore(shost->host_lock, flags);
2294                 scsi_target_unblock(&rport->dev);
2295                 fc_queue_work(shost, &rport->stgt_delete_work);
2296                 return;
2297         }
2298
2299         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
2300                 spin_unlock_irqrestore(shost->host_lock, flags);
2301                 dev_printk(KERN_ERR, &rport->dev,
2302                         "blocked FC remote port time out: leaving target alone\n");
2303                 return;
2304         }
2305
2306         if (fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) {
2307                 list_del(&rport->peers);
2308                 rport->port_state = FC_PORTSTATE_DELETED;
2309                 dev_printk(KERN_ERR, &rport->dev,
2310                         "blocked FC remote port time out: removing target\n");
2311                 fc_queue_work(shost, &rport->rport_delete_work);
2312                 spin_unlock_irqrestore(shost->host_lock, flags);
2313                 return;
2314         }
2315
2316         dev_printk(KERN_ERR, &rport->dev,
2317                 "blocked FC remote port time out: removing target and "
2318                 "saving binding\n");
2319
2320         list_move_tail(&rport->peers, &fc_host->rport_bindings);
2321
2322         /*
2323          * Note: We do not remove or clear the hostdata area. This allows
2324          *   host-specific target data to persist along with the
2325          *   scsi_target_id. It's up to the host to manage it's hostdata area.
2326          */
2327
2328         /*
2329          * Reinitialize port attributes that may change if the port comes back.
2330          */
2331         rport->maxframe_size = -1;
2332         rport->supported_classes = FC_COS_UNSPECIFIED;
2333         rport->roles = FC_RPORT_ROLE_UNKNOWN;
2334         rport->port_state = FC_PORTSTATE_NOTPRESENT;
2335
2336         /* remove the identifiers that aren't used in the consisting binding */
2337         switch (fc_host->tgtid_bind_type) {
2338         case FC_TGTID_BIND_BY_WWPN:
2339                 rport->node_name = -1;
2340                 rport->port_id = -1;
2341                 break;
2342         case FC_TGTID_BIND_BY_WWNN:
2343                 rport->port_name = -1;
2344                 rport->port_id = -1;
2345                 break;
2346         case FC_TGTID_BIND_BY_ID:
2347                 rport->node_name = -1;
2348                 rport->port_name = -1;
2349                 break;
2350         case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
2351                 break;
2352         }
2353
2354         /*
2355          * As this only occurs if the remote port (scsi target)
2356          * went away and didn't come back - we'll remove
2357          * all attached scsi devices.
2358          */
2359         spin_unlock_irqrestore(shost->host_lock, flags);
2360
2361         scsi_target_unblock(&rport->dev);
2362         fc_queue_work(shost, &rport->stgt_delete_work);
2363 }
2364
2365 /**
2366  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a
2367  *                       disconnected SCSI target.
2368  *
2369  * @work:       rport to terminate io on.
2370  *
2371  * Notes: Only requests the failure of the io, not that all are flushed
2372  *    prior to returning.
2373  **/
2374 static void
2375 fc_timeout_fail_rport_io(struct work_struct *work)
2376 {
2377         struct fc_rport *rport =
2378                 container_of(work, struct fc_rport, fail_io_work.work);
2379         struct Scsi_Host *shost = rport_to_shost(rport);
2380         struct fc_internal *i = to_fc_internal(shost->transportt);
2381
2382         if (rport->port_state != FC_PORTSTATE_BLOCKED)
2383                 return;
2384
2385         i->f->terminate_rport_io(rport);
2386 }
2387
2388 /**
2389  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
2390  *
2391  * @work:       remote port to be scanned.
2392  **/
2393 static void
2394 fc_scsi_scan_rport(struct work_struct *work)
2395 {
2396         struct fc_rport *rport =
2397                 container_of(work, struct fc_rport, scan_work);
2398         struct Scsi_Host *shost = rport_to_shost(rport);
2399         unsigned long flags;
2400
2401         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
2402             (rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
2403                 scsi_scan_target(&rport->dev, rport->channel,
2404                         rport->scsi_target_id, SCAN_WILD_CARD, 1);
2405         }
2406
2407         spin_lock_irqsave(shost->host_lock, flags);
2408         rport->flags &= ~FC_RPORT_SCAN_PENDING;
2409         spin_unlock_irqrestore(shost->host_lock, flags);
2410 }
2411
2412
2413 MODULE_AUTHOR("Martin Hicks");
2414 MODULE_DESCRIPTION("FC Transport Attributes");
2415 MODULE_LICENSE("GPL");
2416
2417 module_init(fc_transport_init);
2418 module_exit(fc_transport_exit);