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) 2004-2007   James Smart, Emulex Corporation
  23  *    Rewrite for host, target, device, and remote port attributes,
  24  *    statistics, and service functions...
  25  *    Add vports, etc
  26  *
  27  */
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/slab.h>
  31 #include <linux/delay.h>
  32 #include <scsi/scsi_device.h>
  33 #include <scsi/scsi_host.h>
  34 #include <scsi/scsi_transport.h>
  35 #include <scsi/scsi_transport_fc.h>
  36 #include <scsi/scsi_cmnd.h>
  37 #include <linux/netlink.h>
  38 #include <net/netlink.h>
  39 #include <scsi/scsi_netlink_fc.h>
  40 #include <scsi/scsi_bsg_fc.h>
  41 #include "scsi_priv.h"
  42 #include "scsi_transport_fc_internal.h"
  43
  44 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  45 static void fc_vport_sched_delete(struct work_struct *work);
  46 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
  47         struct device *pdev, struct fc_vport_identifiers  *ids,
  48         struct fc_vport **vport);
  49 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
  50 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
  51 static void fc_bsg_remove(struct request_queue *);
  52 static void fc_bsg_goose_queue(struct fc_rport *);
  53
  54 /*
  55  * Redefine so that we can have same named attributes in the
  56  * sdev/starget/host objects.
  57  */
  58 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)                \
  59 struct device_attribute device_attr_##_prefix##_##_name =       \
  60         __ATTR(_name,_mode,_show,_store)
  61
  62 #define fc_enum_name_search(title, table_type, table)                   \
  63 static const char *get_fc_##title##_name(enum table_type table_key)     \
  64 {                                                                       \
  65         int i;                                                          \
  66         char *name = NULL;                                              \
  67                                                                         \
  68         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  69                 if (table[i].value == table_key) {                      \
  70                         name = table[i].name;                           \
  71                         break;                                          \
  72                 }                                                       \
  73         }                                                               \
  74         return name;                                                    \
  75 }
  76
  77 #define fc_enum_name_match(title, table_type, table)                    \
  78 static int get_fc_##title##_match(const char *table_key,                \
  79                 enum table_type *value)                                 \
  80 {                                                                       \
  81         int i;                                                          \
  82                                                                         \
  83         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  84                 if (strncmp(table_key, table[i].name,                   \
  85                                 table[i].matchlen) == 0) {              \
  86                         *value = table[i].value;                        \
  87                         return 0; /* success */                         \
  88                 }                                                       \
  89         }                                                               \
  90         return 1; /* failure */                                         \
  91 }
  92
  93
  94 /* Convert fc_port_type values to ascii string name */
  95 static struct {
  96         enum fc_port_type       value;
  97         char                    *name;
  98 } fc_port_type_names[] = {
  99         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
 100         { FC_PORTTYPE_OTHER,            "Other" },
 101         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
 102         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
 103         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
 104         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
 105         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection)" },
 106         { FC_PORTTYPE_NPIV,             "NPIV VPORT" },
 107 };
 108 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
 109 #define FC_PORTTYPE_MAX_NAMELEN         50
 110
 111 /* Reuse fc_port_type enum function for vport_type */
 112 #define get_fc_vport_type_name get_fc_port_type_name
 113
 114
 115 /* Convert fc_host_event_code values to ascii string name */
 116 static const struct {
 117         enum fc_host_event_code         value;
 118         char                            *name;
 119 } fc_host_event_code_names[] = {
 120         { FCH_EVT_LIP,                  "lip" },
 121         { FCH_EVT_LINKUP,               "link_up" },
 122         { FCH_EVT_LINKDOWN,             "link_down" },
 123         { FCH_EVT_LIPRESET,             "lip_reset" },
 124         { FCH_EVT_RSCN,                 "rscn" },
 125         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
 126         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
 127         { FCH_EVT_PORT_ONLINE,          "port_online" },
 128         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
 129         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
 130         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
 131         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
 132 };
 133 fc_enum_name_search(host_event_code, fc_host_event_code,
 134                 fc_host_event_code_names)
 135 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
 136
 137
 138 /* Convert fc_port_state values to ascii string name */
 139 static struct {
 140         enum fc_port_state      value;
 141         char                    *name;
 142 } fc_port_state_names[] = {
 143         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
 144         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 145         { FC_PORTSTATE_ONLINE,          "Online" },
 146         { FC_PORTSTATE_OFFLINE,         "Offline" },
 147         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 148         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 149         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 150         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 151         { FC_PORTSTATE_ERROR,           "Error" },
 152         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 153         { FC_PORTSTATE_DELETED,         "Deleted" },
 154 };
 155 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 156 #define FC_PORTSTATE_MAX_NAMELEN        20
 157
 158
 159 /* Convert fc_vport_state values to ascii string name */
 160 static struct {
 161         enum fc_vport_state     value;
 162         char                    *name;
 163 } fc_vport_state_names[] = {
 164         { FC_VPORT_UNKNOWN,             "Unknown" },
 165         { FC_VPORT_ACTIVE,              "Active" },
 166         { FC_VPORT_DISABLED,            "Disabled" },
 167         { FC_VPORT_LINKDOWN,            "Linkdown" },
 168         { FC_VPORT_INITIALIZING,        "Initializing" },
 169         { FC_VPORT_NO_FABRIC_SUPP,      "No Fabric Support" },
 170         { FC_VPORT_NO_FABRIC_RSCS,      "No Fabric Resources" },
 171         { FC_VPORT_FABRIC_LOGOUT,       "Fabric Logout" },
 172         { FC_VPORT_FABRIC_REJ_WWN,      "Fabric Rejected WWN" },
 173         { FC_VPORT_FAILED,              "VPort Failed" },
 174 };
 175 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
 176 #define FC_VPORTSTATE_MAX_NAMELEN       24
 177
 178 /* Reuse fc_vport_state enum function for vport_last_state */
 179 #define get_fc_vport_last_state_name get_fc_vport_state_name
 180
 181
 182 /* Convert fc_tgtid_binding_type values to ascii string name */
 183 static const struct {
 184         enum fc_tgtid_binding_type      value;
 185         char                            *name;
 186         int                             matchlen;
 187 } fc_tgtid_binding_type_names[] = {
 188         { FC_TGTID_BIND_NONE, "none", 4 },
 189         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 190         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 191         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 192 };
 193 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 194                 fc_tgtid_binding_type_names)
 195 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 196                 fc_tgtid_binding_type_names)
 197 #define FC_BINDTYPE_MAX_NAMELEN 30
 198
 199
 200 #define fc_bitfield_name_search(title, table)                   \
 201 static ssize_t                                                  \
 202 get_fc_##title##_names(u32 table_key, char *buf)                \
 203 {                                                               \
 204         char *prefix = "";                                      \
 205         ssize_t len = 0;                                        \
 206         int i;                                                  \
 207                                                                 \
 208         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 209                 if (table[i].value & table_key) {               \
 210                         len += sprintf(buf + len, "%s%s",       \
 211                                 prefix, table[i].name);         \
 212                         prefix = ", ";                          \
 213                 }                                               \
 214         }                                                       \
 215         len += sprintf(buf + len, "\n");                        \
 216         return len;                                             \
 217 }
 218
 219
 220 /* Convert FC_COS bit values to ascii string name */
 221 static const struct {
 222         u32                     value;
 223         char                    *name;
 224 } fc_cos_names[] = {
 225         { FC_COS_CLASS1,        "Class 1" },
 226         { FC_COS_CLASS2,        "Class 2" },
 227         { FC_COS_CLASS3,        "Class 3" },
 228         { FC_COS_CLASS4,        "Class 4" },
 229         { FC_COS_CLASS6,        "Class 6" },
 230 };
 231 fc_bitfield_name_search(cos, fc_cos_names)
 232
 233
 234 /* Convert FC_PORTSPEED bit values to ascii string name */
 235 static const struct {
 236         u32                     value;
 237         char                    *name;
 238 } fc_port_speed_names[] = {
 239         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 240         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 241         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 242         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 243         { FC_PORTSPEED_8GBIT,           "8 Gbit" },
 244         { FC_PORTSPEED_16GBIT,          "16 Gbit" },
 245         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 246 };
 247 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 248
 249
 250 static int
 251 show_fc_fc4s (char *buf, u8 *fc4_list)
 252 {
 253         int i, len=0;
 254
 255         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 256                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 257         len += sprintf(buf + len, "\n");
 258         return len;
 259 }
 260
 261
 262 /* Convert FC_PORT_ROLE bit values to ascii string name */
 263 static const struct {
 264         u32                     value;
 265         char                    *name;
 266 } fc_port_role_names[] = {
 267         { FC_PORT_ROLE_FCP_TARGET,      "FCP Target" },
 268         { FC_PORT_ROLE_FCP_INITIATOR,   "FCP Initiator" },
 269         { FC_PORT_ROLE_IP_PORT,         "IP Port" },
 270 };
 271 fc_bitfield_name_search(port_roles, fc_port_role_names)
 272
 273 /*
 274  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 275  */
 276 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 277 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 278 #define FC_FPORT_PORTID                 0x00000e
 279 #define FC_FABCTLR_PORTID               0x00000d
 280 #define FC_DIRSRVR_PORTID               0x00000c
 281 #define FC_TIMESRVR_PORTID              0x00000b
 282 #define FC_MGMTSRVR_PORTID              0x00000a
 283
 284
 285 static void fc_timeout_deleted_rport(struct work_struct *work);
 286 static void fc_timeout_fail_rport_io(struct work_struct *work);
 287 static void fc_scsi_scan_rport(struct work_struct *work);
 288
 289 /*
 290  * Attribute counts pre object type...
 291  * Increase these values if you add attributes
 292  */
 293 #define FC_STARGET_NUM_ATTRS    3
 294 #define FC_RPORT_NUM_ATTRS      10
 295 #define FC_VPORT_NUM_ATTRS      9
 296 #define FC_HOST_NUM_ATTRS       22
 297
 298 struct fc_internal {
 299         struct scsi_transport_template t;
 300         struct fc_function_template *f;
 301
 302         /*
 303          * For attributes : each object has :
 304          *   An array of the actual attributes structures
 305          *   An array of null-terminated pointers to the attribute
 306          *     structures - used for mid-layer interaction.
 307          *
 308          * The attribute containers for the starget and host are are
 309          * part of the midlayer. As the remote port is specific to the
 310          * fc transport, we must provide the attribute container.
 311          */
 312         struct device_attribute private_starget_attrs[
 313                                                         FC_STARGET_NUM_ATTRS];
 314         struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 315
 316         struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 317         struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 318
 319         struct transport_container rport_attr_cont;
 320         struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 321         struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 322
 323         struct transport_container vport_attr_cont;
 324         struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
 325         struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
 326 };
 327
 328 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 329
 330 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 331                            struct device *cdev)
 332 {
 333         struct scsi_target *starget = to_scsi_target(dev);
 334         struct fc_rport *rport = starget_to_rport(starget);
 335
 336         /*
 337          * if parent is remote port, use values from remote port.
 338          * Otherwise, this host uses the fc_transport, but not the
 339          * remote port interface. As such, initialize to known non-values.
 340          */
 341         if (rport) {
 342                 fc_starget_node_name(starget) = rport->node_name;
 343                 fc_starget_port_name(starget) = rport->port_name;
 344                 fc_starget_port_id(starget) = rport->port_id;
 345         } else {
 346                 fc_starget_node_name(starget) = -1;
 347                 fc_starget_port_name(starget) = -1;
 348                 fc_starget_port_id(starget) = -1;
 349         }
 350
 351         return 0;
 352 }
 353
 354 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 355                                "fc_transport",
 356                                fc_target_setup,
 357                                NULL,
 358                                NULL);
 359
 360 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 361                          struct device *cdev)
 362 {
 363         struct Scsi_Host *shost = dev_to_shost(dev);
 364         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 365
 366         /*
 367          * Set default values easily detected by the midlayer as
 368          * failure cases.  The scsi lldd is responsible for initializing
 369          * all transport attributes to valid values per host.
 370          */
 371         fc_host->node_name = -1;
 372         fc_host->port_name = -1;
 373         fc_host->permanent_port_name = -1;
 374         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 375         memset(fc_host->supported_fc4s, 0,
 376                 sizeof(fc_host->supported_fc4s));
 377         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 378         fc_host->maxframe_size = -1;
 379         fc_host->max_npiv_vports = 0;
 380         memset(fc_host->serial_number, 0,
 381                 sizeof(fc_host->serial_number));
 382
 383         fc_host->port_id = -1;
 384         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 385         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 386         memset(fc_host->active_fc4s, 0,
 387                 sizeof(fc_host->active_fc4s));
 388         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 389         fc_host->fabric_name = -1;
 390         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 391         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
 392
 393         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 394
 395         INIT_LIST_HEAD(&fc_host->rports);
 396         INIT_LIST_HEAD(&fc_host->rport_bindings);
 397         INIT_LIST_HEAD(&fc_host->vports);
 398         fc_host->next_rport_number = 0;
 399         fc_host->next_target_id = 0;
 400         fc_host->next_vport_number = 0;
 401         fc_host->npiv_vports_inuse = 0;
 402
 403         snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
 404                  "fc_wq_%d", shost->host_no);
 405         fc_host->work_q = create_singlethread_workqueue(
 406                                         fc_host->work_q_name);
 407         if (!fc_host->work_q)
 408                 return -ENOMEM;
 409
 410         snprintf(fc_host->devloss_work_q_name,
 411                  sizeof(fc_host->devloss_work_q_name),
 412                  "fc_dl_%d", shost->host_no);
 413         fc_host->devloss_work_q = create_singlethread_workqueue(
 414                                         fc_host->devloss_work_q_name);
 415         if (!fc_host->devloss_work_q) {
 416                 destroy_workqueue(fc_host->work_q);
 417                 fc_host->work_q = NULL;
 418                 return -ENOMEM;
 419         }
 420
 421         fc_bsg_hostadd(shost, fc_host);
 422         /* ignore any bsg add error - we just can't do sgio */
 423
 424         return 0;
 425 }
 426
 427 static int fc_host_remove(struct transport_container *tc, struct device *dev,
 428                          struct device *cdev)
 429 {
 430         struct Scsi_Host *shost = dev_to_shost(dev);
 431         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 432
 433         fc_bsg_remove(fc_host->rqst_q);
 434         return 0;
 435 }
 436
 437 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 438                                "fc_host",
 439                                fc_host_setup,
 440                                fc_host_remove,
 441                                NULL);
 442
 443 /*
 444  * Setup and Remove actions for remote ports are handled
 445  * in the service functions below.
 446  */
 447 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 448                                "fc_remote_ports",
 449                                NULL,
 450                                NULL,
 451                                NULL);
 452
 453 /*
 454  * Setup and Remove actions for virtual ports are handled
 455  * in the service functions below.
 456  */
 457 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
 458                                "fc_vports",
 459                                NULL,
 460                                NULL,
 461                                NULL);
 462
 463 /*
 464  * Module Parameters
 465  */
 466
 467 /*
 468  * dev_loss_tmo: the default number of seconds that the FC transport
 469  *   should insulate the loss of a remote port.
 470  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 471  */
 472 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
 473
 474 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
 475 MODULE_PARM_DESC(dev_loss_tmo,
 476                  "Maximum number of seconds that the FC transport should"
 477                  " insulate the loss of a remote port. Once this value is"
 478                  " exceeded, the scsi target is removed. Value should be"
 479                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
 480                  " fast_io_fail_tmo is not set.");
 481
 482 /*
 483  * Netlink Infrastructure
 484  */
 485
 486 static atomic_t fc_event_seq;
 487
 488 /**
 489  * fc_get_event_number - Obtain the next sequential FC event number
 490  *
 491  * Notes:
 492  *   We could have inlined this, but it would have required fc_event_seq to
 493  *   be exposed. For now, live with the subroutine call.
 494  *   Atomic used to avoid lock/unlock...
 495  */
 496 u32
 497 fc_get_event_number(void)
 498 {
 499         return atomic_add_return(1, &fc_event_seq);
 500 }
 501 EXPORT_SYMBOL(fc_get_event_number);
 502
 503
 504 /**
 505  * fc_host_post_event - called to post an even on an fc_host.
 506  * @shost:              host the event occurred on
 507  * @event_number:       fc event number obtained from get_fc_event_number()
 508  * @event_code:         fc_host event being posted
 509  * @event_data:         32bits of data for the event being posted
 510  *
 511  * Notes:
 512  *      This routine assumes no locks are held on entry.
 513  */
 514 void
 515 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
 516                 enum fc_host_event_code event_code, u32 event_data)
 517 {
 518         struct sk_buff *skb;
 519         struct nlmsghdr *nlh;
 520         struct fc_nl_event *event;
 521         const char *name;
 522         u32 len, skblen;
 523         int err;
 524
 525         if (!scsi_nl_sock) {
 526                 err = -ENOENT;
 527                 goto send_fail;
 528         }
 529
 530         len = FC_NL_MSGALIGN(sizeof(*event));
 531         skblen = NLMSG_SPACE(len);
 532
 533         skb = alloc_skb(skblen, GFP_KERNEL);
 534         if (!skb) {
 535                 err = -ENOBUFS;
 536                 goto send_fail;
 537         }
 538
 539         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 540                                 skblen - sizeof(*nlh), 0);
 541         if (!nlh) {
 542                 err = -ENOBUFS;
 543                 goto send_fail_skb;
 544         }
 545         event = NLMSG_DATA(nlh);
 546
 547         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 548                                 FC_NL_ASYNC_EVENT, len);
 549         event->seconds = get_seconds();
 550         event->vendor_id = 0;
 551         event->host_no = shost->host_no;
 552         event->event_datalen = sizeof(u32);     /* bytes */
 553         event->event_num = event_number;
 554         event->event_code = event_code;
 555         event->event_data = event_data;
 556
 557         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 558                         GFP_KERNEL);
 559         return;
 560
 561 send_fail_skb:
 562         kfree_skb(skb);
 563 send_fail:
 564         name = get_fc_host_event_code_name(event_code);
 565         printk(KERN_WARNING
 566                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
 567                 __func__, shost->host_no,
 568                 (name) ? name : "<unknown>", event_data, err);
 569         return;
 570 }
 571 EXPORT_SYMBOL(fc_host_post_event);
 572
 573
 574 /**
 575  * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
 576  * @shost:              host the event occurred on
 577  * @event_number:       fc event number obtained from get_fc_event_number()
 578  * @data_len:           amount, in bytes, of vendor unique data
 579  * @data_buf:           pointer to vendor unique data
 580  * @vendor_id:          Vendor id
 581  *
 582  * Notes:
 583  *      This routine assumes no locks are held on entry.
 584  */
 585 void
 586 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
 587                 u32 data_len, char * data_buf, u64 vendor_id)
 588 {
 589         struct sk_buff *skb;
 590         struct nlmsghdr *nlh;
 591         struct fc_nl_event *event;
 592         u32 len, skblen;
 593         int err;
 594
 595         if (!scsi_nl_sock) {
 596                 err = -ENOENT;
 597                 goto send_vendor_fail;
 598         }
 599
 600         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
 601         skblen = NLMSG_SPACE(len);
 602
 603         skb = alloc_skb(skblen, GFP_KERNEL);
 604         if (!skb) {
 605                 err = -ENOBUFS;
 606                 goto send_vendor_fail;
 607         }
 608
 609         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 610                                 skblen - sizeof(*nlh), 0);
 611         if (!nlh) {
 612                 err = -ENOBUFS;
 613                 goto send_vendor_fail_skb;
 614         }
 615         event = NLMSG_DATA(nlh);
 616
 617         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 618                                 FC_NL_ASYNC_EVENT, len);
 619         event->seconds = get_seconds();
 620         event->vendor_id = vendor_id;
 621         event->host_no = shost->host_no;
 622         event->event_datalen = data_len;        /* bytes */
 623         event->event_num = event_number;
 624         event->event_code = FCH_EVT_VENDOR_UNIQUE;
 625         memcpy(&event->event_data, data_buf, data_len);
 626
 627         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 628                         GFP_KERNEL);
 629         return;
 630
 631 send_vendor_fail_skb:
 632         kfree_skb(skb);
 633 send_vendor_fail:
 634         printk(KERN_WARNING
 635                 "%s: Dropped Event : host %d vendor_unique - err %d\n",
 636                 __func__, shost->host_no, err);
 637         return;
 638 }
 639 EXPORT_SYMBOL(fc_host_post_vendor_event);
 640
 641
 642
 643 static __init int fc_transport_init(void)
 644 {
 645         int error;
 646
 647         atomic_set(&fc_event_seq, 0);
 648
 649         error = transport_class_register(&fc_host_class);
 650         if (error)
 651                 return error;
 652         error = transport_class_register(&fc_vport_class);
 653         if (error)
 654                 goto unreg_host_class;
 655         error = transport_class_register(&fc_rport_class);
 656         if (error)
 657                 goto unreg_vport_class;
 658         error = transport_class_register(&fc_transport_class);
 659         if (error)
 660                 goto unreg_rport_class;
 661         return 0;
 662
 663 unreg_rport_class:
 664         transport_class_unregister(&fc_rport_class);
 665 unreg_vport_class:
 666         transport_class_unregister(&fc_vport_class);
 667 unreg_host_class:
 668         transport_class_unregister(&fc_host_class);
 669         return error;
 670 }
 671
 672 static void __exit fc_transport_exit(void)
 673 {
 674         transport_class_unregister(&fc_transport_class);
 675         transport_class_unregister(&fc_rport_class);
 676         transport_class_unregister(&fc_host_class);
 677         transport_class_unregister(&fc_vport_class);
 678 }
 679
 680 /*
 681  * FC Remote Port Attribute Management
 682  */
 683
 684 #define fc_rport_show_function(field, format_string, sz, cast)          \
 685 static ssize_t                                                          \
 686 show_fc_rport_##field (struct device *dev,                              \
 687                        struct device_attribute *attr, char *buf)        \
 688 {                                                                       \
 689         struct fc_rport *rport = transport_class_to_rport(dev);         \
 690         struct Scsi_Host *shost = rport_to_shost(rport);                \
 691         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 692         if ((i->f->get_rport_##field) &&                                \
 693             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 694               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 695               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 696                 i->f->get_rport_##field(rport);                         \
 697         return snprintf(buf, sz, format_string, cast rport->field);     \
 698 }
 699
 700 #define fc_rport_store_function(field)                                  \
 701 static ssize_t                                                          \
 702 store_fc_rport_##field(struct device *dev,                              \
 703                        struct device_attribute *attr,                   \
 704                        const char *buf, size_t count)                   \
 705 {                                                                       \
 706         int val;                                                        \
 707         struct fc_rport *rport = transport_class_to_rport(dev);         \
 708         struct Scsi_Host *shost = rport_to_shost(rport);                \
 709         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 710         char *cp;                                                       \
 711         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
 712             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
 713             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
 714                 return -EBUSY;                                          \
 715         val = simple_strtoul(buf, &cp, 0);                              \
 716         if (*cp && (*cp != '\n'))                                       \
 717                 return -EINVAL;                                         \
 718         i->f->set_rport_##field(rport, val);                            \
 719         return count;                                                   \
 720 }
 721
 722 #define fc_rport_rd_attr(field, format_string, sz)                      \
 723         fc_rport_show_function(field, format_string, sz, )              \
 724 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 725                          show_fc_rport_##field, NULL)
 726
 727 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 728         fc_rport_show_function(field, format_string, sz, (cast))        \
 729 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 730                           show_fc_rport_##field, NULL)
 731
 732 #define fc_rport_rw_attr(field, format_string, sz)                      \
 733         fc_rport_show_function(field, format_string, sz, )              \
 734         fc_rport_store_function(field)                                  \
 735 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,          \
 736                         show_fc_rport_##field,                          \
 737                         store_fc_rport_##field)
 738
 739
 740 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 741 static ssize_t                                                          \
 742 show_fc_rport_##field (struct device *dev,                              \
 743                        struct device_attribute *attr, char *buf)        \
 744 {                                                                       \
 745         struct fc_rport *rport = transport_class_to_rport(dev);         \
 746         return snprintf(buf, sz, format_string, cast rport->field);     \
 747 }
 748
 749 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 750         fc_private_rport_show_function(field, format_string, sz, )      \
 751 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 752                          show_fc_rport_##field, NULL)
 753
 754 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 755         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 756 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 757                           show_fc_rport_##field, NULL)
 758
 759
 760 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 761 static ssize_t                                                          \
 762 show_fc_rport_##title (struct device *dev,                              \
 763                        struct device_attribute *attr, char *buf)        \
 764 {                                                                       \
 765         struct fc_rport *rport = transport_class_to_rport(dev);         \
 766         const char *name;                                               \
 767         name = get_fc_##title##_name(rport->title);                     \
 768         if (!name)                                                      \
 769                 return -EINVAL;                                         \
 770         return snprintf(buf, maxlen, "%s\n", name);                     \
 771 }                                                                       \
 772 static FC_DEVICE_ATTR(rport, title, S_IRUGO,                    \
 773                         show_fc_rport_##title, NULL)
 774
 775
 776 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 777         i->private_rport_attrs[count] = device_attr_rport_##field; \
 778         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 779         i->private_rport_attrs[count].store = NULL;                     \
 780         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 781         if (i->f->show_rport_##field)                                   \
 782                 count++
 783
 784 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 785         i->private_rport_attrs[count] = device_attr_rport_##field; \
 786         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 787         i->private_rport_attrs[count].store = NULL;                     \
 788         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 789         count++
 790
 791 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 792         i->private_rport_attrs[count] = device_attr_rport_##field; \
 793         if (!i->f->set_rport_##field) {                                 \
 794                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 795                 i->private_rport_attrs[count].store = NULL;             \
 796         }                                                               \
 797         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 798         if (i->f->show_rport_##field)                                   \
 799                 count++
 800
 801 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
 802 {                                                                       \
 803         i->private_rport_attrs[count] = device_attr_rport_##field; \
 804         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 805         count++;                                                        \
 806 }
 807
 808
 809 /* The FC Transport Remote Port Attributes: */
 810
 811 /* Fixed Remote Port Attributes */
 812
 813 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 814
 815 static ssize_t
 816 show_fc_rport_supported_classes (struct device *dev,
 817                                  struct device_attribute *attr, char *buf)
 818 {
 819         struct fc_rport *rport = transport_class_to_rport(dev);
 820         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 821                 return snprintf(buf, 20, "unspecified\n");
 822         return get_fc_cos_names(rport->supported_classes, buf);
 823 }
 824 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 825                 show_fc_rport_supported_classes, NULL);
 826
 827 /* Dynamic Remote Port Attributes */
 828
 829 /*
 830  * dev_loss_tmo attribute
 831  */
 832 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
 833 static ssize_t
 834 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
 835                             const char *buf, size_t count)
 836 {
 837         int val;
 838         struct fc_rport *rport = transport_class_to_rport(dev);
 839         struct Scsi_Host *shost = rport_to_shost(rport);
 840         struct fc_internal *i = to_fc_internal(shost->transportt);
 841         char *cp;
 842         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 843             (rport->port_state == FC_PORTSTATE_DELETED) ||
 844             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 845                 return -EBUSY;
 846         val = simple_strtoul(buf, &cp, 0);
 847         if ((*cp && (*cp != '\n')) || (val < 0))
 848                 return -EINVAL;
 849
 850         /*
 851          * If fast_io_fail is off we have to cap
 852          * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
 853          */
 854         if (rport->fast_io_fail_tmo == -1 &&
 855             val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
 856                 return -EINVAL;
 857
 858         i->f->set_rport_dev_loss_tmo(rport, val);
 859         return count;
 860 }
 861 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
 862                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
 863
 864
 865 /* Private Remote Port Attributes */
 866
 867 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 868 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 869 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 870
 871 static ssize_t
 872 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
 873                      char *buf)
 874 {
 875         struct fc_rport *rport = transport_class_to_rport(dev);
 876
 877         /* identify any roles that are port_id specific */
 878         if ((rport->port_id != -1) &&
 879             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 880                                         FC_WELLKNOWN_PORTID_MASK) {
 881                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 882                 case FC_FPORT_PORTID:
 883                         return snprintf(buf, 30, "Fabric Port\n");
 884                 case FC_FABCTLR_PORTID:
 885                         return snprintf(buf, 30, "Fabric Controller\n");
 886                 case FC_DIRSRVR_PORTID:
 887                         return snprintf(buf, 30, "Directory Server\n");
 888                 case FC_TIMESRVR_PORTID:
 889                         return snprintf(buf, 30, "Time Server\n");
 890                 case FC_MGMTSRVR_PORTID:
 891                         return snprintf(buf, 30, "Management Server\n");
 892                 default:
 893                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 894                 }
 895         } else {
 896                 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
 897                         return snprintf(buf, 20, "unknown\n");
 898                 return get_fc_port_roles_names(rport->roles, buf);
 899         }
 900 }
 901 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
 902                 show_fc_rport_roles, NULL);
 903
 904 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 905 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 906
 907 /*
 908  * fast_io_fail_tmo attribute
 909  */
 910 static ssize_t
 911 show_fc_rport_fast_io_fail_tmo (struct device *dev,
 912                                 struct device_attribute *attr, char *buf)
 913 {
 914         struct fc_rport *rport = transport_class_to_rport(dev);
 915
 916         if (rport->fast_io_fail_tmo == -1)
 917                 return snprintf(buf, 5, "off\n");
 918         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
 919 }
 920
 921 static ssize_t
 922 store_fc_rport_fast_io_fail_tmo(struct device *dev,
 923                                 struct device_attribute *attr, const char *buf,
 924                                 size_t count)
 925 {
 926         int val;
 927         char *cp;
 928         struct fc_rport *rport = transport_class_to_rport(dev);
 929
 930         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 931             (rport->port_state == FC_PORTSTATE_DELETED) ||
 932             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 933                 return -EBUSY;
 934         if (strncmp(buf, "off", 3) == 0)
 935                 rport->fast_io_fail_tmo = -1;
 936         else {
 937                 val = simple_strtoul(buf, &cp, 0);
 938                 if ((*cp && (*cp != '\n')) || (val < 0))
 939                         return -EINVAL;
 940                 /*
 941                  * Cap fast_io_fail by dev_loss_tmo or
 942                  * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 943                  */
 944                 if ((val >= rport->dev_loss_tmo) ||
 945                     (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
 946                         return -EINVAL;
 947
 948                 rport->fast_io_fail_tmo = val;
 949         }
 950         return count;
 951 }
 952 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
 953         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
 954
 955
 956 /*
 957  * FC SCSI Target Attribute Management
 958  */
 959
 960 /*
 961  * Note: in the target show function we recognize when the remote
 962  *  port is in the heirarchy and do not allow the driver to get
 963  *  involved in sysfs functions. The driver only gets involved if
 964  *  it's the "old" style that doesn't use rports.
 965  */
 966 #define fc_starget_show_function(field, format_string, sz, cast)        \
 967 static ssize_t                                                          \
 968 show_fc_starget_##field (struct device *dev,                            \
 969                          struct device_attribute *attr, char *buf)      \
 970 {                                                                       \
 971         struct scsi_target *starget = transport_class_to_starget(dev);  \
 972         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 973         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 974         struct fc_rport *rport = starget_to_rport(starget);             \
 975         if (rport)                                                      \
 976                 fc_starget_##field(starget) = rport->field;             \
 977         else if (i->f->get_starget_##field)                             \
 978                 i->f->get_starget_##field(starget);                     \
 979         return snprintf(buf, sz, format_string,                         \
 980                 cast fc_starget_##field(starget));                      \
 981 }
 982
 983 #define fc_starget_rd_attr(field, format_string, sz)                    \
 984         fc_starget_show_function(field, format_string, sz, )            \
 985 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
 986                          show_fc_starget_##field, NULL)
 987
 988 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
 989         fc_starget_show_function(field, format_string, sz, (cast))      \
 990 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
 991                           show_fc_starget_##field, NULL)
 992
 993 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
 994         i->private_starget_attrs[count] = device_attr_starget_##field; \
 995         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
 996         i->private_starget_attrs[count].store = NULL;                   \
 997         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 998         if (i->f->show_starget_##field)                                 \
 999                 count++
1000
1001 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
1002         i->private_starget_attrs[count] = device_attr_starget_##field; \
1003         if (!i->f->set_starget_##field) {                               \
1004                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
1005                 i->private_starget_attrs[count].store = NULL;           \
1006         }                                                               \
1007         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1008         if (i->f->show_starget_##field)                                 \
1009                 count++
1010
1011 /* The FC Transport SCSI Target Attributes: */
1012 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1013 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1014 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1015
1016
1017 /*
1018  * FC Virtual Port Attribute Management
1019  */
1020
1021 #define fc_vport_show_function(field, format_string, sz, cast)          \
1022 static ssize_t                                                          \
1023 show_fc_vport_##field (struct device *dev,                              \
1024                        struct device_attribute *attr, char *buf)        \
1025 {                                                                       \
1026         struct fc_vport *vport = transport_class_to_vport(dev);         \
1027         struct Scsi_Host *shost = vport_to_shost(vport);                \
1028         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1029         if ((i->f->get_vport_##field) &&                                \
1030             !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))       \
1031                 i->f->get_vport_##field(vport);                         \
1032         return snprintf(buf, sz, format_string, cast vport->field);     \
1033 }
1034
1035 #define fc_vport_store_function(field)                                  \
1036 static ssize_t                                                          \
1037 store_fc_vport_##field(struct device *dev,                              \
1038                        struct device_attribute *attr,                   \
1039                        const char *buf, size_t count)                   \
1040 {                                                                       \
1041         int val;                                                        \
1042         struct fc_vport *vport = transport_class_to_vport(dev);         \
1043         struct Scsi_Host *shost = vport_to_shost(vport);                \
1044         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1045         char *cp;                                                       \
1046         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))  \
1047                 return -EBUSY;                                          \
1048         val = simple_strtoul(buf, &cp, 0);                              \
1049         if (*cp && (*cp != '\n'))                                       \
1050                 return -EINVAL;                                         \
1051         i->f->set_vport_##field(vport, val);                            \
1052         return count;                                                   \
1053 }
1054
1055 #define fc_vport_store_str_function(field, slen)                        \
1056 static ssize_t                                                          \
1057 store_fc_vport_##field(struct device *dev,                              \
1058                        struct device_attribute *attr,                   \
1059                        const char *buf, size_t count)                   \
1060 {                                                                       \
1061         struct fc_vport *vport = transport_class_to_vport(dev);         \
1062         struct Scsi_Host *shost = vport_to_shost(vport);                \
1063         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1064         unsigned int cnt=count;                                         \
1065                                                                         \
1066         /* count may include a LF at end of string */                   \
1067         if (buf[cnt-1] == '\n')                                         \
1068                 cnt--;                                                  \
1069         if (cnt > ((slen) - 1))                                         \
1070                 return -EINVAL;                                         \
1071         memcpy(vport->field, buf, cnt);                                 \
1072         i->f->set_vport_##field(vport);                                 \
1073         return count;                                                   \
1074 }
1075
1076 #define fc_vport_rd_attr(field, format_string, sz)                      \
1077         fc_vport_show_function(field, format_string, sz, )              \
1078 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1079                          show_fc_vport_##field, NULL)
1080
1081 #define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
1082         fc_vport_show_function(field, format_string, sz, (cast))        \
1083 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1084                           show_fc_vport_##field, NULL)
1085
1086 #define fc_vport_rw_attr(field, format_string, sz)                      \
1087         fc_vport_show_function(field, format_string, sz, )              \
1088         fc_vport_store_function(field)                                  \
1089 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1090                         show_fc_vport_##field,                          \
1091                         store_fc_vport_##field)
1092
1093 #define fc_private_vport_show_function(field, format_string, sz, cast)  \
1094 static ssize_t                                                          \
1095 show_fc_vport_##field (struct device *dev,                              \
1096                        struct device_attribute *attr, char *buf)        \
1097 {                                                                       \
1098         struct fc_vport *vport = transport_class_to_vport(dev);         \
1099         return snprintf(buf, sz, format_string, cast vport->field);     \
1100 }
1101
1102 #define fc_private_vport_store_u32_function(field)                      \
1103 static ssize_t                                                          \
1104 store_fc_vport_##field(struct device *dev,                              \
1105                        struct device_attribute *attr,                   \
1106                        const char *buf, size_t count)                   \
1107 {                                                                       \
1108         u32 val;                                                        \
1109         struct fc_vport *vport = transport_class_to_vport(dev);         \
1110         char *cp;                                                       \
1111         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))          \
1112                 return -EBUSY;                                          \
1113         val = simple_strtoul(buf, &cp, 0);                              \
1114         if (*cp && (*cp != '\n'))                                       \
1115                 return -EINVAL;                                         \
1116         vport->field = val;                                             \
1117         return count;                                                   \
1118 }
1119
1120
1121 #define fc_private_vport_rd_attr(field, format_string, sz)              \
1122         fc_private_vport_show_function(field, format_string, sz, )      \
1123 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1124                          show_fc_vport_##field, NULL)
1125
1126 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
1127         fc_private_vport_show_function(field, format_string, sz, (cast)) \
1128 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1129                           show_fc_vport_##field, NULL)
1130
1131 #define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
1132         fc_private_vport_show_function(field, format_string, sz, )      \
1133         fc_private_vport_store_u32_function(field)                      \
1134 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1135                         show_fc_vport_##field,                          \
1136                         store_fc_vport_##field)
1137
1138
1139 #define fc_private_vport_rd_enum_attr(title, maxlen)                    \
1140 static ssize_t                                                          \
1141 show_fc_vport_##title (struct device *dev,                              \
1142                        struct device_attribute *attr,                   \
1143                        char *buf)                                       \
1144 {                                                                       \
1145         struct fc_vport *vport = transport_class_to_vport(dev);         \
1146         const char *name;                                               \
1147         name = get_fc_##title##_name(vport->title);                     \
1148         if (!name)                                                      \
1149                 return -EINVAL;                                         \
1150         return snprintf(buf, maxlen, "%s\n", name);                     \
1151 }                                                                       \
1152 static FC_DEVICE_ATTR(vport, title, S_IRUGO,                    \
1153                         show_fc_vport_##title, NULL)
1154
1155
1156 #define SETUP_VPORT_ATTRIBUTE_RD(field)                                 \
1157         i->private_vport_attrs[count] = device_attr_vport_##field; \
1158         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1159         i->private_vport_attrs[count].store = NULL;                     \
1160         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1161         if (i->f->get_##field)                                          \
1162                 count++
1163         /* NOTE: Above MACRO differs: checks function not show bit */
1164
1165 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                         \
1166         i->private_vport_attrs[count] = device_attr_vport_##field; \
1167         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1168         i->private_vport_attrs[count].store = NULL;                     \
1169         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1170         count++
1171
1172 #define SETUP_VPORT_ATTRIBUTE_WR(field)                                 \
1173         i->private_vport_attrs[count] = device_attr_vport_##field; \
1174         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1175         if (i->f->field)                                                \
1176                 count++
1177         /* NOTE: Above MACRO differs: checks function */
1178
1179 #define SETUP_VPORT_ATTRIBUTE_RW(field)                                 \
1180         i->private_vport_attrs[count] = device_attr_vport_##field; \
1181         if (!i->f->set_vport_##field) {                                 \
1182                 i->private_vport_attrs[count].attr.mode = S_IRUGO;      \
1183                 i->private_vport_attrs[count].store = NULL;             \
1184         }                                                               \
1185         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1186         count++
1187         /* NOTE: Above MACRO differs: does not check show bit */
1188
1189 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                         \
1190 {                                                                       \
1191         i->private_vport_attrs[count] = device_attr_vport_##field; \
1192         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1193         count++;                                                        \
1194 }
1195
1196
1197 /* The FC Transport Virtual Port Attributes: */
1198
1199 /* Fixed Virtual Port Attributes */
1200
1201 /* Dynamic Virtual Port Attributes */
1202
1203 /* Private Virtual Port Attributes */
1204
1205 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1206 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1207 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1208 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1209
1210 static ssize_t
1211 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1212                      char *buf)
1213 {
1214         struct fc_vport *vport = transport_class_to_vport(dev);
1215
1216         if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1217                 return snprintf(buf, 20, "unknown\n");
1218         return get_fc_port_roles_names(vport->roles, buf);
1219 }
1220 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1221
1222 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1223
1224 fc_private_vport_show_function(symbolic_name, "%s\n",
1225                 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1226 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1227 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1228                 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1229
1230 static ssize_t
1231 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1232                       const char *buf, size_t count)
1233 {
1234         struct fc_vport *vport = transport_class_to_vport(dev);
1235         struct Scsi_Host *shost = vport_to_shost(vport);
1236         unsigned long flags;
1237
1238         spin_lock_irqsave(shost->host_lock, flags);
1239         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1240                 spin_unlock_irqrestore(shost->host_lock, flags);
1241                 return -EBUSY;
1242         }
1243         vport->flags |= FC_VPORT_DELETING;
1244         spin_unlock_irqrestore(shost->host_lock, flags);
1245
1246         fc_queue_work(shost, &vport->vport_delete_work);
1247         return count;
1248 }
1249 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1250                         NULL, store_fc_vport_delete);
1251
1252
1253 /*
1254  * Enable/Disable vport
1255  *  Write "1" to disable, write "0" to enable
1256  */
1257 static ssize_t
1258 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1259                        const char *buf,
1260                            size_t count)
1261 {
1262         struct fc_vport *vport = transport_class_to_vport(dev);
1263         struct Scsi_Host *shost = vport_to_shost(vport);
1264         struct fc_internal *i = to_fc_internal(shost->transportt);
1265         int stat;
1266
1267         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1268                 return -EBUSY;
1269
1270         if (*buf == '0') {
1271                 if (vport->vport_state != FC_VPORT_DISABLED)
1272                         return -EALREADY;
1273         } else if (*buf == '1') {
1274                 if (vport->vport_state == FC_VPORT_DISABLED)
1275                         return -EALREADY;
1276         } else
1277                 return -EINVAL;
1278
1279         stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1280         return stat ? stat : count;
1281 }
1282 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1283                         NULL, store_fc_vport_disable);
1284
1285
1286 /*
1287  * Host Attribute Management
1288  */
1289
1290 #define fc_host_show_function(field, format_string, sz, cast)           \
1291 static ssize_t                                                          \
1292 show_fc_host_##field (struct device *dev,                               \
1293                       struct device_attribute *attr, char *buf)         \
1294 {                                                                       \
1295         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1296         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1297         if (i->f->get_host_##field)                                     \
1298                 i->f->get_host_##field(shost);                          \
1299         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1300 }
1301
1302 #define fc_host_store_function(field)                                   \
1303 static ssize_t                                                          \
1304 store_fc_host_##field(struct device *dev,                               \
1305                       struct device_attribute *attr,                    \
1306                       const char *buf,  size_t count)                   \
1307 {                                                                       \
1308         int val;                                                        \
1309         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1310         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1311         char *cp;                                                       \
1312                                                                         \
1313         val = simple_strtoul(buf, &cp, 0);                              \
1314         if (*cp && (*cp != '\n'))                                       \
1315                 return -EINVAL;                                         \
1316         i->f->set_host_##field(shost, val);                             \
1317         return count;                                                   \
1318 }
1319
1320 #define fc_host_store_str_function(field, slen)                         \
1321 static ssize_t                                                          \
1322 store_fc_host_##field(struct device *dev,                               \
1323                       struct device_attribute *attr,                    \
1324                       const char *buf, size_t count)                    \
1325 {                                                                       \
1326         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1327         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1328         unsigned int cnt=count;                                         \
1329                                                                         \
1330         /* count may include a LF at end of string */                   \
1331         if (buf[cnt-1] == '\n')                                         \
1332                 cnt--;                                                  \
1333         if (cnt > ((slen) - 1))                                         \
1334                 return -EINVAL;                                         \
1335         memcpy(fc_host_##field(shost), buf, cnt);                       \
1336         i->f->set_host_##field(shost);                                  \
1337         return count;                                                   \
1338 }
1339
1340 #define fc_host_rd_attr(field, format_string, sz)                       \
1341         fc_host_show_function(field, format_string, sz, )               \
1342 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1343                          show_fc_host_##field, NULL)
1344
1345 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
1346         fc_host_show_function(field, format_string, sz, (cast))         \
1347 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1348                           show_fc_host_##field, NULL)
1349
1350 #define fc_host_rw_attr(field, format_string, sz)                       \
1351         fc_host_show_function(field, format_string, sz, )               \
1352         fc_host_store_function(field)                                   \
1353 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,           \
1354                         show_fc_host_##field,                           \
1355                         store_fc_host_##field)
1356
1357 #define fc_host_rd_enum_attr(title, maxlen)                             \
1358 static ssize_t                                                          \
1359 show_fc_host_##title (struct device *dev,                               \
1360                       struct device_attribute *attr, char *buf)         \
1361 {                                                                       \
1362         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1363         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1364         const char *name;                                               \
1365         if (i->f->get_host_##title)                                     \
1366                 i->f->get_host_##title(shost);                          \
1367         name = get_fc_##title##_name(fc_host_##title(shost));           \
1368         if (!name)                                                      \
1369                 return -EINVAL;                                         \
1370         return snprintf(buf, maxlen, "%s\n", name);                     \
1371 }                                                                       \
1372 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1373
1374 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
1375         i->private_host_attrs[count] = device_attr_host_##field;        \
1376         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1377         i->private_host_attrs[count].store = NULL;                      \
1378         i->host_attrs[count] = &i->private_host_attrs[count];           \
1379         if (i->f->show_host_##field)                                    \
1380                 count++
1381
1382 #define SETUP_HOST_ATTRIBUTE_RD_NS(field)                               \
1383         i->private_host_attrs[count] = device_attr_host_##field;        \
1384         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1385         i->private_host_attrs[count].store = NULL;                      \
1386         i->host_attrs[count] = &i->private_host_attrs[count];           \
1387         count++
1388
1389 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1390         i->private_host_attrs[count] = device_attr_host_##field;        \
1391         if (!i->f->set_host_##field) {                                  \
1392                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1393                 i->private_host_attrs[count].store = NULL;              \
1394         }                                                               \
1395         i->host_attrs[count] = &i->private_host_attrs[count];           \
1396         if (i->f->show_host_##field)                                    \
1397                 count++
1398
1399
1400 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1401 static ssize_t                                                          \
1402 show_fc_host_##field (struct device *dev,                               \
1403                       struct device_attribute *attr, char *buf)         \
1404 {                                                                       \
1405         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1406         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1407 }
1408
1409 #define fc_private_host_rd_attr(field, format_string, sz)               \
1410         fc_private_host_show_function(field, format_string, sz, )       \
1411 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1412                          show_fc_host_##field, NULL)
1413
1414 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1415         fc_private_host_show_function(field, format_string, sz, (cast)) \
1416 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1417                           show_fc_host_##field, NULL)
1418
1419 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1420         i->private_host_attrs[count] = device_attr_host_##field;        \
1421         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1422         i->private_host_attrs[count].store = NULL;                      \
1423         i->host_attrs[count] = &i->private_host_attrs[count];           \
1424         count++
1425
1426 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1427 {                                                                       \
1428         i->private_host_attrs[count] = device_attr_host_##field;        \
1429         i->host_attrs[count] = &i->private_host_attrs[count];           \
1430         count++;                                                        \
1431 }
1432
1433
1434 /* Fixed Host Attributes */
1435
1436 static ssize_t
1437 show_fc_host_supported_classes (struct device *dev,
1438                                 struct device_attribute *attr, char *buf)
1439 {
1440         struct Scsi_Host *shost = transport_class_to_shost(dev);
1441
1442         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1443                 return snprintf(buf, 20, "unspecified\n");
1444
1445         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1446 }
1447 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1448                 show_fc_host_supported_classes, NULL);
1449
1450 static ssize_t
1451 show_fc_host_supported_fc4s (struct device *dev,
1452                              struct device_attribute *attr, char *buf)
1453 {
1454         struct Scsi_Host *shost = transport_class_to_shost(dev);
1455         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1456 }
1457 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1458                 show_fc_host_supported_fc4s, NULL);
1459
1460 static ssize_t
1461 show_fc_host_supported_speeds (struct device *dev,
1462                                struct device_attribute *attr, char *buf)
1463 {
1464         struct Scsi_Host *shost = transport_class_to_shost(dev);
1465
1466         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1467                 return snprintf(buf, 20, "unknown\n");
1468
1469         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1470 }
1471 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1472                 show_fc_host_supported_speeds, NULL);
1473
1474
1475 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1476 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1477 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1478                              unsigned long long);
1479 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1480 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1481 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1482
1483
1484 /* Dynamic Host Attributes */
1485
1486 static ssize_t
1487 show_fc_host_active_fc4s (struct device *dev,
1488                           struct device_attribute *attr, char *buf)
1489 {
1490         struct Scsi_Host *shost = transport_class_to_shost(dev);
1491         struct fc_internal *i = to_fc_internal(shost->transportt);
1492
1493         if (i->f->get_host_active_fc4s)
1494                 i->f->get_host_active_fc4s(shost);
1495
1496         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1497 }
1498 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1499                 show_fc_host_active_fc4s, NULL);
1500
1501 static ssize_t
1502 show_fc_host_speed (struct device *dev,
1503                     struct device_attribute *attr, char *buf)
1504 {
1505         struct Scsi_Host *shost = transport_class_to_shost(dev);
1506         struct fc_internal *i = to_fc_internal(shost->transportt);
1507
1508         if (i->f->get_host_speed)
1509                 i->f->get_host_speed(shost);
1510
1511         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1512                 return snprintf(buf, 20, "unknown\n");
1513
1514         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1515 }
1516 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1517                 show_fc_host_speed, NULL);
1518
1519
1520 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1521 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1522 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1523 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1524 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1525
1526 fc_private_host_show_function(system_hostname, "%s\n",
1527                 FC_SYMBOLIC_NAME_SIZE + 1, )
1528 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1529 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1530                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1531
1532
1533 /* Private Host Attributes */
1534
1535 static ssize_t
1536 show_fc_private_host_tgtid_bind_type(struct device *dev,
1537                                      struct device_attribute *attr, char *buf)
1538 {
1539         struct Scsi_Host *shost = transport_class_to_shost(dev);
1540         const char *name;
1541
1542         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1543         if (!name)
1544                 return -EINVAL;
1545         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1546 }
1547
1548 #define get_list_head_entry(pos, head, member)          \
1549         pos = list_entry((head)->next, typeof(*pos), member)
1550
1551 static ssize_t
1552 store_fc_private_host_tgtid_bind_type(struct device *dev,
1553         struct device_attribute *attr, const char *buf, size_t count)
1554 {
1555         struct Scsi_Host *shost = transport_class_to_shost(dev);
1556         struct fc_rport *rport;
1557         enum fc_tgtid_binding_type val;
1558         unsigned long flags;
1559
1560         if (get_fc_tgtid_bind_type_match(buf, &val))
1561                 return -EINVAL;
1562
1563         /* if changing bind type, purge all unused consistent bindings */
1564         if (val != fc_host_tgtid_bind_type(shost)) {
1565                 spin_lock_irqsave(shost->host_lock, flags);
1566                 while (!list_empty(&fc_host_rport_bindings(shost))) {
1567                         get_list_head_entry(rport,
1568                                 &fc_host_rport_bindings(shost), peers);
1569                         list_del(&rport->peers);
1570                         rport->port_state = FC_PORTSTATE_DELETED;
1571                         fc_queue_work(shost, &rport->rport_delete_work);
1572                 }
1573                 spin_unlock_irqrestore(shost->host_lock, flags);
1574         }
1575
1576         fc_host_tgtid_bind_type(shost) = val;
1577         return count;
1578 }
1579
1580 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1581                         show_fc_private_host_tgtid_bind_type,
1582                         store_fc_private_host_tgtid_bind_type);
1583
1584 static ssize_t
1585 store_fc_private_host_issue_lip(struct device *dev,
1586         struct device_attribute *attr, const char *buf, size_t count)
1587 {
1588         struct Scsi_Host *shost = transport_class_to_shost(dev);
1589         struct fc_internal *i = to_fc_internal(shost->transportt);
1590         int ret;
1591
1592         /* ignore any data value written to the attribute */
1593         if (i->f->issue_fc_host_lip) {
1594                 ret = i->f->issue_fc_host_lip(shost);
1595                 return ret ? ret: count;
1596         }
1597
1598         return -ENOENT;
1599 }
1600
1601 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1602                         store_fc_private_host_issue_lip);
1603
1604 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1605
1606
1607 /*
1608  * Host Statistics Management
1609  */
1610
1611 /* Show a given an attribute in the statistics group */
1612 static ssize_t
1613 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1614 {
1615         struct Scsi_Host *shost = transport_class_to_shost(dev);
1616         struct fc_internal *i = to_fc_internal(shost->transportt);
1617         struct fc_host_statistics *stats;
1618         ssize_t ret = -ENOENT;
1619
1620         if (offset > sizeof(struct fc_host_statistics) ||
1621             offset % sizeof(u64) != 0)
1622                 WARN_ON(1);
1623
1624         if (i->f->get_fc_host_stats) {
1625                 stats = (i->f->get_fc_host_stats)(shost);
1626                 if (stats)
1627                         ret = snprintf(buf, 20, "0x%llx\n",
1628                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1629         }
1630         return ret;
1631 }
1632
1633
1634 /* generate a read-only statistics attribute */
1635 #define fc_host_statistic(name)                                         \
1636 static ssize_t show_fcstat_##name(struct device *cd,                    \
1637                                   struct device_attribute *attr,        \
1638                                   char *buf)                            \
1639 {                                                                       \
1640         return fc_stat_show(cd, buf,                                    \
1641                             offsetof(struct fc_host_statistics, name)); \
1642 }                                                                       \
1643 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1644
1645 fc_host_statistic(seconds_since_last_reset);
1646 fc_host_statistic(tx_frames);
1647 fc_host_statistic(tx_words);
1648 fc_host_statistic(rx_frames);
1649 fc_host_statistic(rx_words);
1650 fc_host_statistic(lip_count);
1651 fc_host_statistic(nos_count);
1652 fc_host_statistic(error_frames);
1653 fc_host_statistic(dumped_frames);
1654 fc_host_statistic(link_failure_count);
1655 fc_host_statistic(loss_of_sync_count);
1656 fc_host_statistic(loss_of_signal_count);
1657 fc_host_statistic(prim_seq_protocol_err_count);
1658 fc_host_statistic(invalid_tx_word_count);
1659 fc_host_statistic(invalid_crc_count);
1660 fc_host_statistic(fcp_input_requests);
1661 fc_host_statistic(fcp_output_requests);
1662 fc_host_statistic(fcp_control_requests);
1663 fc_host_statistic(fcp_input_megabytes);
1664 fc_host_statistic(fcp_output_megabytes);
1665
1666 static ssize_t
1667 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1668                     const char *buf, size_t count)
1669 {
1670         struct Scsi_Host *shost = transport_class_to_shost(dev);
1671         struct fc_internal *i = to_fc_internal(shost->transportt);
1672
1673         /* ignore any data value written to the attribute */
1674         if (i->f->reset_fc_host_stats) {
1675                 i->f->reset_fc_host_stats(shost);
1676                 return count;
1677         }
1678
1679         return -ENOENT;
1680 }
1681 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1682                                 fc_reset_statistics);
1683
1684 static struct attribute *fc_statistics_attrs[] = {
1685         &device_attr_host_seconds_since_last_reset.attr,
1686         &device_attr_host_tx_frames.attr,
1687         &device_attr_host_tx_words.attr,
1688         &device_attr_host_rx_frames.attr,
1689         &device_attr_host_rx_words.attr,
1690         &device_attr_host_lip_count.attr,
1691         &device_attr_host_nos_count.attr,
1692         &device_attr_host_error_frames.attr,
1693         &device_attr_host_dumped_frames.attr,
1694         &device_attr_host_link_failure_count.attr,
1695         &device_attr_host_loss_of_sync_count.attr,
1696         &device_attr_host_loss_of_signal_count.attr,
1697         &device_attr_host_prim_seq_protocol_err_count.attr,
1698         &device_attr_host_invalid_tx_word_count.attr,
1699         &device_attr_host_invalid_crc_count.attr,
1700         &device_attr_host_fcp_input_requests.attr,
1701         &device_attr_host_fcp_output_requests.attr,
1702         &device_attr_host_fcp_control_requests.attr,
1703         &device_attr_host_fcp_input_megabytes.attr,
1704         &device_attr_host_fcp_output_megabytes.attr,
1705         &device_attr_host_reset_statistics.attr,
1706         NULL
1707 };
1708
1709 static struct attribute_group fc_statistics_group = {
1710         .name = "statistics",
1711         .attrs = fc_statistics_attrs,
1712 };
1713
1714
1715 /* Host Vport Attributes */
1716
1717 static int
1718 fc_parse_wwn(const char *ns, u64 *nm)
1719 {
1720         unsigned int i, j;
1721         u8 wwn[8];
1722
1723         memset(wwn, 0, sizeof(wwn));
1724
1725         /* Validate and store the new name */
1726         for (i=0, j=0; i < 16; i++) {
1727                 if ((*ns >= 'a') && (*ns <= 'f'))
1728                         j = ((j << 4) | ((*ns++ -'a') + 10));
1729                 else if ((*ns >= 'A') && (*ns <= 'F'))
1730                         j = ((j << 4) | ((*ns++ -'A') + 10));
1731                 else if ((*ns >= '0') && (*ns <= '9'))
1732                         j = ((j << 4) | (*ns++ -'0'));
1733                 else
1734                         return -EINVAL;
1735                 if (i % 2) {
1736                         wwn[i/2] = j & 0xff;
1737                         j = 0;
1738                 }
1739         }
1740
1741         *nm = wwn_to_u64(wwn);
1742
1743         return 0;
1744 }
1745
1746
1747 /*
1748  * "Short-cut" sysfs variable to create a new vport on a FC Host.
1749  * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1750  * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1751  * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1752  */
1753 static ssize_t
1754 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1755                            const char *buf, size_t count)
1756 {
1757         struct Scsi_Host *shost = transport_class_to_shost(dev);
1758         struct fc_vport_identifiers vid;
1759         struct fc_vport *vport;
1760         unsigned int cnt=count;
1761         int stat;
1762
1763         memset(&vid, 0, sizeof(vid));
1764
1765         /* count may include a LF at end of string */
1766         if (buf[cnt-1] == '\n')
1767                 cnt--;
1768
1769         /* validate we have enough characters for WWPN */
1770         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1771                 return -EINVAL;
1772
1773         stat = fc_parse_wwn(&buf[0], &vid.port_name);
1774         if (stat)
1775                 return stat;
1776
1777         stat = fc_parse_wwn(&buf[17], &vid.node_name);
1778         if (stat)
1779                 return stat;
1780
1781         vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1782         vid.vport_type = FC_PORTTYPE_NPIV;
1783         /* vid.symbolic_name is already zero/NULL's */
1784         vid.disable = false;            /* always enabled */
1785
1786         /* we only allow support on Channel 0 !!! */
1787         stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1788         return stat ? stat : count;
1789 }
1790 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1791                         store_fc_host_vport_create);
1792
1793
1794 /*
1795  * "Short-cut" sysfs variable to delete a vport on a FC Host.
1796  * Vport is identified by a string containing "<WWPN>:<WWNN>".
1797  * The WWNs are specified as hex characters, and may *not* contain
1798  * any prefixes (e.g. 0x, x, etc)
1799  */
1800 static ssize_t
1801 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1802                            const char *buf, size_t count)
1803 {
1804         struct Scsi_Host *shost = transport_class_to_shost(dev);
1805         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1806         struct fc_vport *vport;
1807         u64 wwpn, wwnn;
1808         unsigned long flags;
1809         unsigned int cnt=count;
1810         int stat, match;
1811
1812         /* count may include a LF at end of string */
1813         if (buf[cnt-1] == '\n')
1814                 cnt--;
1815
1816         /* validate we have enough characters for WWPN */
1817         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1818                 return -EINVAL;
1819
1820         stat = fc_parse_wwn(&buf[0], &wwpn);
1821         if (stat)
1822                 return stat;
1823
1824         stat = fc_parse_wwn(&buf[17], &wwnn);
1825         if (stat)
1826                 return stat;
1827
1828         spin_lock_irqsave(shost->host_lock, flags);
1829         match = 0;
1830         /* we only allow support on Channel 0 !!! */
1831         list_for_each_entry(vport, &fc_host->vports, peers) {
1832                 if ((vport->channel == 0) &&
1833                     (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1834                         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1835                                 break;
1836                         vport->flags |= FC_VPORT_DELETING;
1837                         match = 1;
1838                         break;
1839                 }
1840         }
1841         spin_unlock_irqrestore(shost->host_lock, flags);
1842
1843         if (!match)
1844                 return -ENODEV;
1845
1846         stat = fc_vport_terminate(vport);
1847         return stat ? stat : count;
1848 }
1849 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1850                         store_fc_host_vport_delete);
1851
1852
1853 static int fc_host_match(struct attribute_container *cont,
1854                           struct device *dev)
1855 {
1856         struct Scsi_Host *shost;
1857         struct fc_internal *i;
1858
1859         if (!scsi_is_host_device(dev))
1860                 return 0;
1861
1862         shost = dev_to_shost(dev);
1863         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1864             != &fc_host_class.class)
1865                 return 0;
1866
1867         i = to_fc_internal(shost->transportt);
1868
1869         return &i->t.host_attrs.ac == cont;
1870 }
1871
1872 static int fc_target_match(struct attribute_container *cont,
1873                             struct device *dev)
1874 {
1875         struct Scsi_Host *shost;
1876         struct fc_internal *i;
1877
1878         if (!scsi_is_target_device(dev))
1879                 return 0;
1880
1881         shost = dev_to_shost(dev->parent);
1882         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1883             != &fc_host_class.class)
1884                 return 0;
1885
1886         i = to_fc_internal(shost->transportt);
1887
1888         return &i->t.target_attrs.ac == cont;
1889 }
1890
1891 static void fc_rport_dev_release(struct device *dev)
1892 {
1893         struct fc_rport *rport = dev_to_rport(dev);
1894         put_device(dev->parent);
1895         kfree(rport);
1896 }
1897
1898 int scsi_is_fc_rport(const struct device *dev)
1899 {
1900         return dev->release == fc_rport_dev_release;
1901 }
1902 EXPORT_SYMBOL(scsi_is_fc_rport);
1903
1904 static int fc_rport_match(struct attribute_container *cont,
1905                             struct device *dev)
1906 {
1907         struct Scsi_Host *shost;
1908         struct fc_internal *i;
1909
1910         if (!scsi_is_fc_rport(dev))
1911                 return 0;
1912
1913         shost = dev_to_shost(dev->parent);
1914         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1915             != &fc_host_class.class)
1916                 return 0;
1917
1918         i = to_fc_internal(shost->transportt);
1919
1920         return &i->rport_attr_cont.ac == cont;
1921 }
1922
1923
1924 static void fc_vport_dev_release(struct device *dev)
1925 {
1926         struct fc_vport *vport = dev_to_vport(dev);
1927         put_device(dev->parent);                /* release kobj parent */
1928         kfree(vport);
1929 }
1930
1931 int scsi_is_fc_vport(const struct device *dev)
1932 {
1933         return dev->release == fc_vport_dev_release;
1934 }
1935 EXPORT_SYMBOL(scsi_is_fc_vport);
1936
1937 static int fc_vport_match(struct attribute_container *cont,
1938                             struct device *dev)
1939 {
1940         struct fc_vport *vport;
1941         struct Scsi_Host *shost;
1942         struct fc_internal *i;
1943
1944         if (!scsi_is_fc_vport(dev))
1945                 return 0;
1946         vport = dev_to_vport(dev);
1947
1948         shost = vport_to_shost(vport);
1949         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1950             != &fc_host_class.class)
1951                 return 0;
1952
1953         i = to_fc_internal(shost->transportt);
1954         return &i->vport_attr_cont.ac == cont;
1955 }
1956
1957
1958 /**
1959  * fc_timed_out - FC Transport I/O timeout intercept handler
1960  * @scmd:       The SCSI command which timed out
1961  *
1962  * This routine protects against error handlers getting invoked while a
1963  * rport is in a blocked state, typically due to a temporarily loss of
1964  * connectivity. If the error handlers are allowed to proceed, requests
1965  * to abort i/o, reset the target, etc will likely fail as there is no way
1966  * to communicate with the device to perform the requested function. These
1967  * failures may result in the midlayer taking the device offline, requiring
1968  * manual intervention to restore operation.
1969  *
1970  * This routine, called whenever an i/o times out, validates the state of
1971  * the underlying rport. If the rport is blocked, it returns
1972  * EH_RESET_TIMER, which will continue to reschedule the timeout.
1973  * Eventually, either the device will return, or devloss_tmo will fire,
1974  * and when the timeout then fires, it will be handled normally.
1975  * If the rport is not blocked, normal error handling continues.
1976  *
1977  * Notes:
1978  *      This routine assumes no locks are held on entry.
1979  */
1980 static enum blk_eh_timer_return
1981 fc_timed_out(struct scsi_cmnd *scmd)
1982 {
1983         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1984
1985         if (rport->port_state == FC_PORTSTATE_BLOCKED)
1986                 return BLK_EH_RESET_TIMER;
1987
1988         return BLK_EH_NOT_HANDLED;
1989 }
1990
1991 /*
1992  * Called by fc_user_scan to locate an rport on the shost that
1993  * matches the channel and target id, and invoke scsi_scan_target()
1994  * on the rport.
1995  */
1996 static void
1997 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1998 {
1999         struct fc_rport *rport;
2000         unsigned long flags;
2001
2002         spin_lock_irqsave(shost->host_lock, flags);
2003
2004         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2005                 if (rport->scsi_target_id == -1)
2006                         continue;
2007
2008                 if (rport->port_state != FC_PORTSTATE_ONLINE)
2009                         continue;
2010
2011                 if ((channel == rport->channel) &&
2012                     (id == rport->scsi_target_id)) {
2013                         spin_unlock_irqrestore(shost->host_lock, flags);
2014                         scsi_scan_target(&rport->dev, channel, id, lun, 1);
2015                         return;
2016                 }
2017         }
2018
2019         spin_unlock_irqrestore(shost->host_lock, flags);
2020 }
2021
2022 /*
2023  * Called via sysfs scan routines. Necessary, as the FC transport
2024  * wants to place all target objects below the rport object. So this
2025  * routine must invoke the scsi_scan_target() routine with the rport
2026  * object as the parent.
2027  */
2028 static int
2029 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2030 {
2031         uint chlo, chhi;
2032         uint tgtlo, tgthi;
2033
2034         if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2035             ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2036             ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2037                 return -EINVAL;
2038
2039         if (channel == SCAN_WILD_CARD) {
2040                 chlo = 0;
2041                 chhi = shost->max_channel + 1;
2042         } else {
2043                 chlo = channel;
2044                 chhi = channel + 1;
2045         }
2046
2047         if (id == SCAN_WILD_CARD) {
2048                 tgtlo = 0;
2049                 tgthi = shost->max_id;
2050         } else {
2051                 tgtlo = id;
2052                 tgthi = id + 1;
2053         }
2054
2055         for ( ; chlo < chhi; chlo++)
2056                 for ( ; tgtlo < tgthi; tgtlo++)
2057                         fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2058
2059         return 0;
2060 }
2061
2062 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2063                                 int result)
2064 {
2065         struct fc_internal *i = to_fc_internal(shost->transportt);
2066         return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2067 }
2068
2069 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2070 {
2071         struct fc_internal *i = to_fc_internal(shost->transportt);
2072         return i->f->it_nexus_response(shost, nexus, result);
2073 }
2074
2075 struct scsi_transport_template *
2076 fc_attach_transport(struct fc_function_template *ft)
2077 {
2078         int count;
2079         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2080                                         GFP_KERNEL);
2081
2082         if (unlikely(!i))
2083                 return NULL;
2084
2085         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2086         i->t.target_attrs.ac.class = &fc_transport_class.class;
2087         i->t.target_attrs.ac.match = fc_target_match;
2088         i->t.target_size = sizeof(struct fc_starget_attrs);
2089         transport_container_register(&i->t.target_attrs);
2090
2091         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2092         i->t.host_attrs.ac.class = &fc_host_class.class;
2093         i->t.host_attrs.ac.match = fc_host_match;
2094         i->t.host_size = sizeof(struct fc_host_attrs);
2095         if (ft->get_fc_host_stats)
2096                 i->t.host_attrs.statistics = &fc_statistics_group;
2097         transport_container_register(&i->t.host_attrs);
2098
2099         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2100         i->rport_attr_cont.ac.class = &fc_rport_class.class;
2101         i->rport_attr_cont.ac.match = fc_rport_match;
2102         transport_container_register(&i->rport_attr_cont);
2103
2104         i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2105         i->vport_attr_cont.ac.class = &fc_vport_class.class;
2106         i->vport_attr_cont.ac.match = fc_vport_match;
2107         transport_container_register(&i->vport_attr_cont);
2108
2109         i->f = ft;
2110
2111         /* Transport uses the shost workq for scsi scanning */
2112         i->t.create_work_queue = 1;
2113
2114         i->t.eh_timed_out = fc_timed_out;
2115
2116         i->t.user_scan = fc_user_scan;
2117
2118         /* target-mode drivers' functions */
2119         i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2120         i->t.it_nexus_response = fc_it_nexus_response;
2121
2122         /*
2123          * Setup SCSI Target Attributes.
2124          */
2125         count = 0;
2126         SETUP_STARGET_ATTRIBUTE_RD(node_name);
2127         SETUP_STARGET_ATTRIBUTE_RD(port_name);
2128         SETUP_STARGET_ATTRIBUTE_RD(port_id);
2129
2130         BUG_ON(count > FC_STARGET_NUM_ATTRS);
2131
2132         i->starget_attrs[count] = NULL;
2133
2134
2135         /*
2136          * Setup SCSI Host Attributes.
2137          */
2138         count=0;
2139         SETUP_HOST_ATTRIBUTE_RD(node_name);
2140         SETUP_HOST_ATTRIBUTE_RD(port_name);
2141         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2142         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2143         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2144         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2145         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2146         if (ft->vport_create) {
2147                 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2148                 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2149         }
2150         SETUP_HOST_ATTRIBUTE_RD(serial_number);
2151
2152         SETUP_HOST_ATTRIBUTE_RD(port_id);
2153         SETUP_HOST_ATTRIBUTE_RD(port_type);
2154         SETUP_HOST_ATTRIBUTE_RD(port_state);
2155         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2156         SETUP_HOST_ATTRIBUTE_RD(speed);
2157         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2158         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2159         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2160
2161         /* Transport-managed attributes */
2162         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2163         if (ft->issue_fc_host_lip)
2164                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2165         if (ft->vport_create)
2166                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2167         if (ft->vport_delete)
2168                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2169
2170         BUG_ON(count > FC_HOST_NUM_ATTRS);
2171
2172         i->host_attrs[count] = NULL;
2173
2174         /*
2175          * Setup Remote Port Attributes.
2176          */
2177         count=0;
2178         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2179         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2180         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2181         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2182         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2183         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2184         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2185         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2186         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2187         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2188
2189         BUG_ON(count > FC_RPORT_NUM_ATTRS);
2190
2191         i->rport_attrs[count] = NULL;
2192
2193         /*
2194          * Setup Virtual Port Attributes.
2195          */
2196         count=0;
2197         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2198         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2199         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2200         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2201         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2202         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2203         SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2204         SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2205         SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2206
2207         BUG_ON(count > FC_VPORT_NUM_ATTRS);
2208
2209         i->vport_attrs[count] = NULL;
2210
2211         return &i->t;
2212 }
2213 EXPORT_SYMBOL(fc_attach_transport);
2214
2215 void fc_release_transport(struct scsi_transport_template *t)
2216 {
2217         struct fc_internal *i = to_fc_internal(t);
2218
2219         transport_container_unregister(&i->t.target_attrs);
2220         transport_container_unregister(&i->t.host_attrs);
2221         transport_container_unregister(&i->rport_attr_cont);
2222         transport_container_unregister(&i->vport_attr_cont);
2223
2224         kfree(i);
2225 }
2226 EXPORT_SYMBOL(fc_release_transport);
2227
2228 /**
2229  * fc_queue_work - Queue work to the fc_host workqueue.
2230  * @shost:      Pointer to Scsi_Host bound to fc_host.
2231  * @work:       Work to queue for execution.
2232  *
2233  * Return value:
2234  *      1 - work queued for execution
2235  *      0 - work is already queued
2236  *      -EINVAL - work queue doesn't exist
2237  */
2238 static int
2239 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2240 {
2241         if (unlikely(!fc_host_work_q(shost))) {
2242                 printk(KERN_ERR
2243                         "ERROR: FC host '%s' attempted to queue work, "
2244                         "when no workqueue created.\n", shost->hostt->name);
2245                 dump_stack();
2246
2247                 return -EINVAL;
2248         }
2249
2250         return queue_work(fc_host_work_q(shost), work);
2251 }
2252
2253 /**
2254  * fc_flush_work - Flush a fc_host's workqueue.
2255  * @shost:      Pointer to Scsi_Host bound to fc_host.
2256  */
2257 static void
2258 fc_flush_work(struct Scsi_Host *shost)
2259 {
2260         if (!fc_host_work_q(shost)) {
2261                 printk(KERN_ERR
2262                         "ERROR: FC host '%s' attempted to flush work, "
2263                         "when no workqueue created.\n", shost->hostt->name);
2264                 dump_stack();
2265                 return;
2266         }
2267
2268         flush_workqueue(fc_host_work_q(shost));
2269 }
2270
2271 /**
2272  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2273  * @shost:      Pointer to Scsi_Host bound to fc_host.
2274  * @work:       Work to queue for execution.
2275  * @delay:      jiffies to delay the work queuing
2276  *
2277  * Return value:
2278  *      1 on success / 0 already queued / < 0 for error
2279  */
2280 static int
2281 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2282                                 unsigned long delay)
2283 {
2284         if (unlikely(!fc_host_devloss_work_q(shost))) {
2285                 printk(KERN_ERR
2286                         "ERROR: FC host '%s' attempted to queue work, "
2287                         "when no workqueue created.\n", shost->hostt->name);
2288                 dump_stack();
2289
2290                 return -EINVAL;
2291         }
2292
2293         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2294 }
2295
2296 /**
2297  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2298  * @shost:      Pointer to Scsi_Host bound to fc_host.
2299  */
2300 static void
2301 fc_flush_devloss(struct Scsi_Host *shost)
2302 {
2303         if (!fc_host_devloss_work_q(shost)) {
2304                 printk(KERN_ERR
2305                         "ERROR: FC host '%s' attempted to flush work, "
2306                         "when no workqueue created.\n", shost->hostt->name);
2307                 dump_stack();
2308                 return;
2309         }
2310
2311         flush_workqueue(fc_host_devloss_work_q(shost));
2312 }
2313
2314
2315 /**
2316  * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2317  * @shost:      Which &Scsi_Host
2318  *
2319  * This routine is expected to be called immediately preceeding the
2320  * a driver's call to scsi_remove_host().
2321  *
2322  * WARNING: A driver utilizing the fc_transport, which fails to call
2323  *   this routine prior to scsi_remove_host(), will leave dangling
2324  *   objects in /sys/class/fc_remote_ports. Access to any of these
2325  *   objects can result in a system crash !!!
2326  *
2327  * Notes:
2328  *      This routine assumes no locks are held on entry.
2329  */
2330 void
2331 fc_remove_host(struct Scsi_Host *shost)
2332 {
2333         struct fc_vport *vport = NULL, *next_vport = NULL;
2334         struct fc_rport *rport = NULL, *next_rport = NULL;
2335         struct workqueue_struct *work_q;
2336         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2337         unsigned long flags;
2338
2339         spin_lock_irqsave(shost->host_lock, flags);
2340
2341         /* Remove any vports */
2342         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2343                 fc_queue_work(shost, &vport->vport_delete_work);
2344
2345         /* Remove any remote ports */
2346         list_for_each_entry_safe(rport, next_rport,
2347                         &fc_host->rports, peers) {
2348                 list_del(&rport->peers);
2349                 rport->port_state = FC_PORTSTATE_DELETED;
2350                 fc_queue_work(shost, &rport->rport_delete_work);
2351         }
2352
2353         list_for_each_entry_safe(rport, next_rport,
2354                         &fc_host->rport_bindings, peers) {
2355                 list_del(&rport->peers);
2356                 rport->port_state = FC_PORTSTATE_DELETED;
2357                 fc_queue_work(shost, &rport->rport_delete_work);
2358         }
2359
2360         spin_unlock_irqrestore(shost->host_lock, flags);
2361
2362         /* flush all scan work items */
2363         scsi_flush_work(shost);
2364
2365         /* flush all stgt delete, and rport delete work items, then kill it  */
2366         if (fc_host->work_q) {
2367                 work_q = fc_host->work_q;
2368                 fc_host->work_q = NULL;
2369                 destroy_workqueue(work_q);
2370         }
2371
2372         /* flush all devloss work items, then kill it  */
2373         if (fc_host->devloss_work_q) {
2374                 work_q = fc_host->devloss_work_q;
2375                 fc_host->devloss_work_q = NULL;
2376                 destroy_workqueue(work_q);
2377         }
2378 }
2379 EXPORT_SYMBOL(fc_remove_host);
2380
2381 static void fc_terminate_rport_io(struct fc_rport *rport)
2382 {
2383         struct Scsi_Host *shost = rport_to_shost(rport);
2384         struct fc_internal *i = to_fc_internal(shost->transportt);
2385
2386         /* Involve the LLDD if possible to terminate all io on the rport. */
2387         if (i->f->terminate_rport_io)
2388                 i->f->terminate_rport_io(rport);
2389
2390         /*
2391          * must unblock to flush queued IO. The caller will have set
2392          * the port_state or flags, so that fc_remote_port_chkready will
2393          * fail IO.
2394          */
2395         scsi_target_unblock(&rport->dev);
2396 }
2397
2398 /**
2399  * fc_starget_delete - called to delete the scsi decendents of an rport
2400  * @work:       remote port to be operated on.
2401  *
2402  * Deletes target and all sdevs.
2403  */
2404 static void
2405 fc_starget_delete(struct work_struct *work)
2406 {
2407         struct fc_rport *rport =
2408                 container_of(work, struct fc_rport, stgt_delete_work);
2409
2410         fc_terminate_rport_io(rport);
2411         scsi_remove_target(&rport->dev);
2412 }
2413
2414
2415 /**
2416  * fc_rport_final_delete - finish rport termination and delete it.
2417  * @work:       remote port to be deleted.
2418  */
2419 static void
2420 fc_rport_final_delete(struct work_struct *work)
2421 {
2422         struct fc_rport *rport =
2423                 container_of(work, struct fc_rport, rport_delete_work);
2424         struct device *dev = &rport->dev;
2425         struct Scsi_Host *shost = rport_to_shost(rport);
2426         struct fc_internal *i = to_fc_internal(shost->transportt);
2427         unsigned long flags;
2428         int do_callback = 0;
2429
2430         /*
2431          * if a scan is pending, flush the SCSI Host work_q so that
2432          * that we can reclaim the rport scan work element.
2433          */
2434         if (rport->flags & FC_RPORT_SCAN_PENDING)
2435                 scsi_flush_work(shost);
2436
2437         fc_terminate_rport_io(rport);
2438
2439         /*
2440          * Cancel any outstanding timers. These should really exist
2441          * only when rmmod'ing the LLDD and we're asking for
2442          * immediate termination of the rports
2443          */
2444         spin_lock_irqsave(shost->host_lock, flags);
2445         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2446                 spin_unlock_irqrestore(shost->host_lock, flags);
2447                 if (!cancel_delayed_work(&rport->fail_io_work))
2448                         fc_flush_devloss(shost);
2449                 if (!cancel_delayed_work(&rport->dev_loss_work))
2450                         fc_flush_devloss(shost);
2451                 spin_lock_irqsave(shost->host_lock, flags);
2452                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2453         }
2454         spin_unlock_irqrestore(shost->host_lock, flags);
2455
2456         /* Delete SCSI target and sdevs */
2457         if (rport->scsi_target_id != -1)
2458                 fc_starget_delete(&rport->stgt_delete_work);
2459
2460         /*
2461          * Notify the driver that the rport is now dead. The LLDD will
2462          * also guarantee that any communication to the rport is terminated
2463          *
2464          * Avoid this call if we already called it when we preserved the
2465          * rport for the binding.
2466          */
2467         spin_lock_irqsave(shost->host_lock, flags);
2468         if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2469             (i->f->dev_loss_tmo_callbk)) {
2470                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2471                 do_callback = 1;
2472         }
2473         spin_unlock_irqrestore(shost->host_lock, flags);
2474
2475         if (do_callback)
2476                 i->f->dev_loss_tmo_callbk(rport);
2477
2478         fc_bsg_remove(rport->rqst_q);
2479
2480         transport_remove_device(dev);
2481         device_del(dev);
2482         transport_destroy_device(dev);
2483         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2484         put_device(dev);                        /* for self-reference */
2485 }
2486
2487
2488 /**
2489  * fc_rport_create - allocates and creates a remote FC port.
2490  * @shost:      scsi host the remote port is connected to.
2491  * @channel:    Channel on shost port connected to.
2492  * @ids:        The world wide names, fc address, and FC4 port
2493  *              roles for the remote port.
2494  *
2495  * Allocates and creates the remoter port structure, including the
2496  * class and sysfs creation.
2497  *
2498  * Notes:
2499  *      This routine assumes no locks are held on entry.
2500  */
2501 static struct fc_rport *
2502 fc_rport_create(struct Scsi_Host *shost, int channel,
2503         struct fc_rport_identifiers  *ids)
2504 {
2505         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2506         struct fc_internal *fci = to_fc_internal(shost->transportt);
2507         struct fc_rport *rport;
2508         struct device *dev;
2509         unsigned long flags;
2510         int error;
2511         size_t size;
2512
2513         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2514         rport = kzalloc(size, GFP_KERNEL);
2515         if (unlikely(!rport)) {
2516                 printk(KERN_ERR "%s: allocation failure\n", __func__);
2517                 return NULL;
2518         }
2519
2520         rport->maxframe_size = -1;
2521         rport->supported_classes = FC_COS_UNSPECIFIED;
2522         rport->dev_loss_tmo = fc_dev_loss_tmo;
2523         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2524         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2525         rport->port_id = ids->port_id;
2526         rport->roles = ids->roles;
2527         rport->port_state = FC_PORTSTATE_ONLINE;
2528         if (fci->f->dd_fcrport_size)
2529                 rport->dd_data = &rport[1];
2530         rport->channel = channel;
2531         rport->fast_io_fail_tmo = -1;
2532
2533         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2534         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2535         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2536         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2537         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2538
2539         spin_lock_irqsave(shost->host_lock, flags);
2540
2541         rport->number = fc_host->next_rport_number++;
2542         if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2543                 rport->scsi_target_id = fc_host->next_target_id++;
2544         else
2545                 rport->scsi_target_id = -1;
2546         list_add_tail(&rport->peers, &fc_host->rports);
2547         get_device(&shost->shost_gendev);       /* for fc_host->rport list */
2548
2549         spin_unlock_irqrestore(shost->host_lock, flags);
2550
2551         dev = &rport->dev;
2552         device_initialize(dev);                 /* takes self reference */
2553         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2554         dev->release = fc_rport_dev_release;
2555         dev_set_name(dev, "rport-%d:%d-%d",
2556                      shost->host_no, channel, rport->number);
2557         transport_setup_device(dev);
2558
2559         error = device_add(dev);
2560         if (error) {
2561                 printk(KERN_ERR "FC Remote Port device_add failed\n");
2562                 goto delete_rport;
2563         }
2564         transport_add_device(dev);
2565         transport_configure_device(dev);
2566
2567         fc_bsg_rportadd(shost, rport);
2568         /* ignore any bsg add error - we just can't do sgio */
2569
2570         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2571                 /* initiate a scan of the target */
2572                 rport->flags |= FC_RPORT_SCAN_PENDING;
2573                 scsi_queue_work(shost, &rport->scan_work);
2574         }
2575
2576         return rport;
2577
2578 delete_rport:
2579         transport_destroy_device(dev);
2580         spin_lock_irqsave(shost->host_lock, flags);
2581         list_del(&rport->peers);
2582         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2583         spin_unlock_irqrestore(shost->host_lock, flags);
2584         put_device(dev->parent);
2585         kfree(rport);
2586         return NULL;
2587 }
2588
2589 /**
2590  * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2591  * @shost:      scsi host the remote port is connected to.
2592  * @channel:    Channel on shost port connected to.
2593  * @ids:        The world wide names, fc address, and FC4 port
2594  *              roles for the remote port.
2595  *
2596  * The LLDD calls this routine to notify the transport of the existence
2597  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2598  * of the port, it's FC address (port_id), and the FC4 roles that are
2599  * active for the port.
2600  *
2601  * For ports that are FCP targets (aka scsi targets), the FC transport
2602  * maintains consistent target id bindings on behalf of the LLDD.
2603  * A consistent target id binding is an assignment of a target id to
2604  * a remote port identifier, which persists while the scsi host is
2605  * attached. The remote port can disappear, then later reappear, and
2606  * it's target id assignment remains the same. This allows for shifts
2607  * in FC addressing (if binding by wwpn or wwnn) with no apparent
2608  * changes to the scsi subsystem which is based on scsi host number and
2609  * target id values.  Bindings are only valid during the attachment of
2610  * the scsi host. If the host detaches, then later re-attaches, target
2611  * id bindings may change.
2612  *
2613  * This routine is responsible for returning a remote port structure.
2614  * The routine will search the list of remote ports it maintains
2615  * internally on behalf of consistent target id mappings. If found, the
2616  * remote port structure will be reused. Otherwise, a new remote port
2617  * structure will be allocated.
2618  *
2619  * Whenever a remote port is allocated, a new fc_remote_port class
2620  * device is created.
2621  *
2622  * Should not be called from interrupt context.
2623  *
2624  * Notes:
2625  *      This routine assumes no locks are held on entry.
2626  */
2627 struct fc_rport *
2628 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2629         struct fc_rport_identifiers  *ids)
2630 {
2631         struct fc_internal *fci = to_fc_internal(shost->transportt);
2632         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2633         struct fc_rport *rport;
2634         unsigned long flags;
2635         int match = 0;
2636
2637         /* ensure any stgt delete functions are done */
2638         fc_flush_work(shost);
2639
2640         /*
2641          * Search the list of "active" rports, for an rport that has been
2642          * deleted, but we've held off the real delete while the target
2643          * is in a "blocked" state.
2644          */
2645         spin_lock_irqsave(shost->host_lock, flags);
2646
2647         list_for_each_entry(rport, &fc_host->rports, peers) {
2648
2649                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2650                         (rport->channel == channel)) {
2651
2652                         switch (fc_host->tgtid_bind_type) {
2653                         case FC_TGTID_BIND_BY_WWPN:
2654                         case FC_TGTID_BIND_NONE:
2655                                 if (rport->port_name == ids->port_name)
2656                                         match = 1;
2657                                 break;
2658                         case FC_TGTID_BIND_BY_WWNN:
2659                                 if (rport->node_name == ids->node_name)
2660                                         match = 1;
2661                                 break;
2662                         case FC_TGTID_BIND_BY_ID:
2663                                 if (rport->port_id == ids->port_id)
2664                                         match = 1;
2665                                 break;
2666                         }
2667
2668                         if (match) {
2669
2670                                 memcpy(&rport->node_name, &ids->node_name,
2671                                         sizeof(rport->node_name));
2672                                 memcpy(&rport->port_name, &ids->port_name,
2673                                         sizeof(rport->port_name));
2674                                 rport->port_id = ids->port_id;
2675
2676                                 rport->port_state = FC_PORTSTATE_ONLINE;
2677                                 rport->roles = ids->roles;
2678
2679                                 spin_unlock_irqrestore(shost->host_lock, flags);
2680
2681                                 if (fci->f->dd_fcrport_size)
2682                                         memset(rport->dd_data, 0,
2683                                                 fci->f->dd_fcrport_size);
2684
2685                                 /*
2686                                  * If we were not a target, cancel the
2687                                  * io terminate and rport timers, and
2688                                  * we're done.
2689                                  *
2690                                  * If we were a target, but our new role
2691                                  * doesn't indicate a target, leave the
2692                                  * timers running expecting the role to
2693                                  * change as the target fully logs in. If
2694                                  * it doesn't, the target will be torn down.
2695                                  *
2696                                  * If we were a target, and our role shows
2697                                  * we're still a target, cancel the timers
2698                                  * and kick off a scan.
2699                                  */
2700
2701                                 /* was a target, not in roles */
2702                                 if ((rport->scsi_target_id != -1) &&
2703                                     (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2704                                         return rport;
2705
2706                                 /*
2707                                  * Stop the fail io and dev_loss timers.
2708                                  * If they flush, the port_state will
2709                                  * be checked and will NOOP the function.
2710                                  */
2711                                 if (!cancel_delayed_work(&rport->fail_io_work))
2712                                         fc_flush_devloss(shost);
2713                                 if (!cancel_delayed_work(&rport->dev_loss_work))
2714                                         fc_flush_devloss(shost);
2715
2716                                 spin_lock_irqsave(shost->host_lock, flags);
2717
2718                                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2719                                                   FC_RPORT_DEVLOSS_PENDING |
2720                                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
2721
2722                                 /* if target, initiate a scan */
2723                                 if (rport->scsi_target_id != -1) {
2724                                         rport->flags |= FC_RPORT_SCAN_PENDING;
2725                                         scsi_queue_work(shost,
2726                                                         &rport->scan_work);
2727                                         spin_unlock_irqrestore(shost->host_lock,
2728                                                         flags);
2729                                         scsi_target_unblock(&rport->dev);
2730                                 } else
2731                                         spin_unlock_irqrestore(shost->host_lock,
2732                                                         flags);
2733
2734                                 fc_bsg_goose_queue(rport);
2735
2736                                 return rport;
2737                         }
2738                 }
2739         }
2740
2741         /*
2742          * Search the bindings array
2743          * Note: if never a FCP target, you won't be on this list
2744          */
2745         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2746
2747                 /* search for a matching consistent binding */
2748
2749                 list_for_each_entry(rport, &fc_host->rport_bindings,
2750                                         peers) {
2751                         if (rport->channel != channel)
2752                                 continue;
2753
2754                         switch (fc_host->tgtid_bind_type) {
2755                         case FC_TGTID_BIND_BY_WWPN:
2756                                 if (rport->port_name == ids->port_name)
2757                                         match = 1;
2758                                 break;
2759                         case FC_TGTID_BIND_BY_WWNN:
2760                                 if (rport->node_name == ids->node_name)
2761                                         match = 1;
2762                                 break;
2763                         case FC_TGTID_BIND_BY_ID:
2764                                 if (rport->port_id == ids->port_id)
2765                                         match = 1;
2766                                 break;
2767                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2768                                 break;
2769                         }
2770
2771                         if (match) {
2772                                 list_move_tail(&rport->peers, &fc_host->rports);
2773                                 break;
2774                         }
2775                 }
2776
2777                 if (match) {
2778                         memcpy(&rport->node_name, &ids->node_name,
2779                                 sizeof(rport->node_name));
2780                         memcpy(&rport->port_name, &ids->port_name,
2781                                 sizeof(rport->port_name));
2782                         rport->port_id = ids->port_id;
2783                         rport->roles = ids->roles;
2784                         rport->port_state = FC_PORTSTATE_ONLINE;
2785                         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2786
2787                         if (fci->f->dd_fcrport_size)
2788                                 memset(rport->dd_data, 0,
2789                                                 fci->f->dd_fcrport_size);
2790
2791                         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2792                                 /* initiate a scan of the target */
2793                                 rport->flags |= FC_RPORT_SCAN_PENDING;
2794                                 scsi_queue_work(shost, &rport->scan_work);
2795                                 spin_unlock_irqrestore(shost->host_lock, flags);
2796                                 scsi_target_unblock(&rport->dev);
2797                         } else
2798                                 spin_unlock_irqrestore(shost->host_lock, flags);
2799
2800                         return rport;
2801                 }
2802         }
2803
2804         spin_unlock_irqrestore(shost->host_lock, flags);
2805
2806         /* No consistent binding found - create new remote port entry */
2807         rport = fc_rport_create(shost, channel, ids);
2808
2809         return rport;
2810 }
2811 EXPORT_SYMBOL(fc_remote_port_add);
2812
2813
2814 /**
2815  * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2816  * @rport:      The remote port that no longer exists
2817  *
2818  * The LLDD calls this routine to notify the transport that a remote
2819  * port is no longer part of the topology. Note: Although a port
2820  * may no longer be part of the topology, it may persist in the remote
2821  * ports displayed by the fc_host. We do this under 2 conditions:
2822  * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2823  *   This allows the port to temporarily disappear, then reappear without
2824  *   disrupting the SCSI device tree attached to it. During the "blocked"
2825  *   period the port will still exist.
2826  * 2) If the port was a scsi target and disappears for longer than we
2827  *   expect, we'll delete the port and the tear down the SCSI device tree
2828  *   attached to it. However, we want to semi-persist the target id assigned
2829  *   to that port if it eventually does exist. The port structure will
2830  *   remain (although with minimal information) so that the target id
2831  *   bindings remails.
2832  *
2833  * If the remote port is not an FCP Target, it will be fully torn down
2834  * and deallocated, including the fc_remote_port class device.
2835  *
2836  * If the remote port is an FCP Target, the port will be placed in a
2837  * temporary blocked state. From the LLDD's perspective, the rport no
2838  * longer exists. From the SCSI midlayer's perspective, the SCSI target
2839  * exists, but all sdevs on it are blocked from further I/O. The following
2840  * is then expected.
2841  *
2842  *   If the remote port does not return (signaled by a LLDD call to
2843  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2844  *   scsi target is removed - killing all outstanding i/o and removing the
2845  *   scsi devices attached ot it. The port structure will be marked Not
2846  *   Present and be partially cleared, leaving only enough information to
2847  *   recognize the remote port relative to the scsi target id binding if
2848  *   it later appears.  The port will remain as long as there is a valid
2849  *   binding (e.g. until the user changes the binding type or unloads the
2850  *   scsi host with the binding).
2851  *
2852  *   If the remote port returns within the dev_loss_tmo value (and matches
2853  *   according to the target id binding type), the port structure will be
2854  *   reused. If it is no longer a SCSI target, the target will be torn
2855  *   down. If it continues to be a SCSI target, then the target will be
2856  *   unblocked (allowing i/o to be resumed), and a scan will be activated
2857  *   to ensure that all luns are detected.
2858  *
2859  * Called from normal process context only - cannot be called from interrupt.
2860  *
2861  * Notes:
2862  *      This routine assumes no locks are held on entry.
2863  */
2864 void
2865 fc_remote_port_delete(struct fc_rport  *rport)
2866 {
2867         struct Scsi_Host *shost = rport_to_shost(rport);
2868         int timeout = rport->dev_loss_tmo;
2869         unsigned long flags;
2870
2871         /*
2872          * No need to flush the fc_host work_q's, as all adds are synchronous.
2873          *
2874          * We do need to reclaim the rport scan work element, so eventually
2875          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2876          * there's still a scan pending.
2877          */
2878
2879         spin_lock_irqsave(shost->host_lock, flags);
2880
2881         if (rport->port_state != FC_PORTSTATE_ONLINE) {
2882                 spin_unlock_irqrestore(shost->host_lock, flags);
2883                 return;
2884         }
2885
2886         /*
2887          * In the past, we if this was not an FCP-Target, we would
2888          * unconditionally just jump to deleting the rport.
2889          * However, rports can be used as node containers by the LLDD,
2890          * and its not appropriate to just terminate the rport at the
2891          * first sign of a loss in connectivity. The LLDD may want to
2892          * send ELS traffic to re-validate the login. If the rport is
2893          * immediately deleted, it makes it inappropriate for a node
2894          * container.
2895          * So... we now unconditionally wait dev_loss_tmo before
2896          * destroying an rport.
2897          */
2898
2899         rport->port_state = FC_PORTSTATE_BLOCKED;
2900
2901         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2902
2903         spin_unlock_irqrestore(shost->host_lock, flags);
2904
2905         if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2906             shost->active_mode & MODE_TARGET)
2907                 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2908
2909         scsi_target_block(&rport->dev);
2910
2911         /* see if we need to kill io faster than waiting for device loss */
2912         if ((rport->fast_io_fail_tmo != -1) &&
2913             (rport->fast_io_fail_tmo < timeout))
2914                 fc_queue_devloss_work(shost, &rport->fail_io_work,
2915                                         rport->fast_io_fail_tmo * HZ);
2916
2917         /* cap the length the devices can be blocked until they are deleted */
2918         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2919 }
2920 EXPORT_SYMBOL(fc_remote_port_delete);
2921
2922 /**
2923  * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
2924  * @rport:      The remote port that changed.
2925  * @roles:      New roles for this port.
2926  *
2927  * Description: The LLDD calls this routine to notify the transport that the
2928  * roles on a remote port may have changed. The largest effect of this is
2929  * if a port now becomes a FCP Target, it must be allocated a
2930  * scsi target id.  If the port is no longer a FCP target, any
2931  * scsi target id value assigned to it will persist in case the
2932  * role changes back to include FCP Target. No changes in the scsi
2933  * midlayer will be invoked if the role changes (in the expectation
2934  * that the role will be resumed. If it doesn't normal error processing
2935  * will take place).
2936  *
2937  * Should not be called from interrupt context.
2938  *
2939  * Notes:
2940  *      This routine assumes no locks are held on entry.
2941  */
2942 void
2943 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
2944 {
2945         struct Scsi_Host *shost = rport_to_shost(rport);
2946         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2947         unsigned long flags;
2948         int create = 0;
2949         int ret;
2950
2951         spin_lock_irqsave(shost->host_lock, flags);
2952         if (roles & FC_PORT_ROLE_FCP_TARGET) {
2953                 if (rport->scsi_target_id == -1) {
2954                         rport->scsi_target_id = fc_host->next_target_id++;
2955                         create = 1;
2956                 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
2957                         create = 1;
2958         } else if (shost->active_mode & MODE_TARGET) {
2959                 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
2960                                              (char *)&rport->node_name);
2961                 if (ret)
2962                         printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
2963                                ret);
2964         }
2965
2966         rport->roles = roles;
2967
2968         spin_unlock_irqrestore(shost->host_lock, flags);
2969
2970         if (create) {
2971                 /*
2972                  * There may have been a delete timer running on the
2973                  * port. Ensure that it is cancelled as we now know
2974                  * the port is an FCP Target.
2975                  * Note: we know the rport is exists and in an online
2976                  *  state as the LLDD would not have had an rport
2977                  *  reference to pass us.
2978                  *
2979                  * Take no action on the del_timer failure as the state
2980                  * machine state change will validate the
2981                  * transaction.
2982                  */
2983                 if (!cancel_delayed_work(&rport->fail_io_work))
2984                         fc_flush_devloss(shost);
2985                 if (!cancel_delayed_work(&rport->dev_loss_work))
2986                         fc_flush_devloss(shost);
2987
2988                 spin_lock_irqsave(shost->host_lock, flags);
2989                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2990                                   FC_RPORT_DEVLOSS_PENDING);
2991                 spin_unlock_irqrestore(shost->host_lock, flags);
2992
2993                 /* ensure any stgt delete functions are done */
2994                 fc_flush_work(shost);
2995
2996                 /* initiate a scan of the target */
2997                 spin_lock_irqsave(shost->host_lock, flags);
2998                 rport->flags |= FC_RPORT_SCAN_PENDING;
2999                 scsi_queue_work(shost, &rport->scan_work);
3000                 spin_unlock_irqrestore(shost->host_lock, flags);
3001                 scsi_target_unblock(&rport->dev);
3002         }
3003 }
3004 EXPORT_SYMBOL(fc_remote_port_rolechg);
3005
3006 /**
3007  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3008  * @work:       rport target that failed to reappear in the allotted time.
3009  *
3010  * Description: An attempt to delete a remote port blocks, and if it fails
3011  *              to return in the allotted time this gets called.
3012  */
3013 static void
3014 fc_timeout_deleted_rport(struct work_struct *work)
3015 {
3016         struct fc_rport *rport =
3017                 container_of(work, struct fc_rport, dev_loss_work.work);
3018         struct Scsi_Host *shost = rport_to_shost(rport);
3019         struct fc_internal *i = to_fc_internal(shost->transportt);
3020         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3021         unsigned long flags;
3022         int do_callback = 0;
3023
3024         spin_lock_irqsave(shost->host_lock, flags);
3025
3026         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3027
3028         /*
3029          * If the port is ONLINE, then it came back. If it was a SCSI
3030          * target, validate it still is. If not, tear down the
3031          * scsi_target on it.
3032          */
3033         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3034             (rport->scsi_target_id != -1) &&
3035             !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3036                 dev_printk(KERN_ERR, &rport->dev,
3037                         "blocked FC remote port time out: no longer"
3038                         " a FCP target, removing starget\n");
3039                 spin_unlock_irqrestore(shost->host_lock, flags);
3040                 scsi_target_unblock(&rport->dev);
3041                 fc_queue_work(shost, &rport->stgt_delete_work);
3042                 return;
3043         }
3044
3045         /* NOOP state - we're flushing workq's */
3046         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3047                 spin_unlock_irqrestore(shost->host_lock, flags);
3048                 dev_printk(KERN_ERR, &rport->dev,
3049                         "blocked FC remote port time out: leaving"
3050                         " rport%s alone\n",
3051                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3052                 return;
3053         }
3054
3055         if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3056             (rport->scsi_target_id == -1)) {
3057                 list_del(&rport->peers);
3058                 rport->port_state = FC_PORTSTATE_DELETED;
3059                 dev_printk(KERN_ERR, &rport->dev,
3060                         "blocked FC remote port time out: removing"
3061                         " rport%s\n",
3062                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3063                 fc_queue_work(shost, &rport->rport_delete_work);
3064                 spin_unlock_irqrestore(shost->host_lock, flags);
3065                 return;
3066         }
3067
3068         dev_printk(KERN_ERR, &rport->dev,
3069                 "blocked FC remote port time out: removing target and "
3070                 "saving binding\n");
3071
3072         list_move_tail(&rport->peers, &fc_host->rport_bindings);
3073
3074         /*
3075          * Note: We do not remove or clear the hostdata area. This allows
3076          *   host-specific target data to persist along with the
3077          *   scsi_target_id. It's up to the host to manage it's hostdata area.
3078          */
3079
3080         /*
3081          * Reinitialize port attributes that may change if the port comes back.
3082          */
3083         rport->maxframe_size = -1;
3084         rport->supported_classes = FC_COS_UNSPECIFIED;
3085         rport->roles = FC_PORT_ROLE_UNKNOWN;
3086         rport->port_state = FC_PORTSTATE_NOTPRESENT;
3087         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3088
3089         /*
3090          * Pre-emptively kill I/O rather than waiting for the work queue
3091          * item to teardown the starget. (FCOE libFC folks prefer this
3092          * and to have the rport_port_id still set when it's done).
3093          */
3094         spin_unlock_irqrestore(shost->host_lock, flags);
3095         fc_terminate_rport_io(rport);
3096
3097         spin_lock_irqsave(shost->host_lock, flags);
3098
3099         if (rport->port_state == FC_PORTSTATE_NOTPRESENT) {     /* still missing */
3100
3101                 /* remove the identifiers that aren't used in the consisting binding */
3102                 switch (fc_host->tgtid_bind_type) {
3103                 case FC_TGTID_BIND_BY_WWPN:
3104                         rport->node_name = -1;
3105                         rport->port_id = -1;
3106                         break;
3107                 case FC_TGTID_BIND_BY_WWNN:
3108                         rport->port_name = -1;
3109                         rport->port_id = -1;
3110                         break;
3111                 case FC_TGTID_BIND_BY_ID:
3112                         rport->node_name = -1;
3113                         rport->port_name = -1;
3114                         break;
3115                 case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
3116                         break;
3117                 }
3118
3119                 /*
3120                  * As this only occurs if the remote port (scsi target)
3121                  * went away and didn't come back - we'll remove
3122                  * all attached scsi devices.
3123                  */
3124                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3125                 fc_queue_work(shost, &rport->stgt_delete_work);
3126
3127                 do_callback = 1;
3128         }
3129
3130         spin_unlock_irqrestore(shost->host_lock, flags);
3131
3132         /*
3133          * Notify the driver that the rport is now dead. The LLDD will
3134          * also guarantee that any communication to the rport is terminated
3135          *
3136          * Note: we set the CALLBK_DONE flag above to correspond
3137          */
3138         if (do_callback && i->f->dev_loss_tmo_callbk)
3139                 i->f->dev_loss_tmo_callbk(rport);
3140 }
3141
3142
3143 /**
3144  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3145  * @work:       rport to terminate io on.
3146  *
3147  * Notes: Only requests the failure of the io, not that all are flushed
3148  *    prior to returning.
3149  */
3150 static void
3151 fc_timeout_fail_rport_io(struct work_struct *work)
3152 {
3153         struct fc_rport *rport =
3154                 container_of(work, struct fc_rport, fail_io_work.work);
3155
3156         if (rport->port_state != FC_PORTSTATE_BLOCKED)
3157                 return;
3158
3159         rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3160         fc_terminate_rport_io(rport);
3161 }
3162
3163 /**
3164  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3165  * @work:       remote port to be scanned.
3166  */
3167 static void
3168 fc_scsi_scan_rport(struct work_struct *work)
3169 {
3170         struct fc_rport *rport =
3171                 container_of(work, struct fc_rport, scan_work);
3172         struct Scsi_Host *shost = rport_to_shost(rport);
3173         struct fc_internal *i = to_fc_internal(shost->transportt);
3174         unsigned long flags;
3175
3176         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3177             (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3178             !(i->f->disable_target_scan)) {
3179                 scsi_scan_target(&rport->dev, rport->channel,
3180                         rport->scsi_target_id, SCAN_WILD_CARD, 1);
3181         }
3182
3183         spin_lock_irqsave(shost->host_lock, flags);
3184         rport->flags &= ~FC_RPORT_SCAN_PENDING;
3185         spin_unlock_irqrestore(shost->host_lock, flags);
3186 }
3187
3188 /**
3189  * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3190  * @cmnd: SCSI command that scsi_eh is trying to recover
3191  *
3192  * This routine can be called from a FC LLD scsi_eh callback. It
3193  * blocks the scsi_eh thread until the fc_rport leaves the
3194  * FC_PORTSTATE_BLOCKED. This is necessary to avoid the scsi_eh
3195  * failing recovery actions for blocked rports which would lead to
3196  * offlined SCSI devices.
3197  */
3198 void fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3199 {
3200         struct Scsi_Host *shost = cmnd->device->host;
3201         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3202         unsigned long flags;
3203
3204         spin_lock_irqsave(shost->host_lock, flags);
3205         while (rport->port_state == FC_PORTSTATE_BLOCKED) {
3206                 spin_unlock_irqrestore(shost->host_lock, flags);
3207                 msleep(1000);
3208                 spin_lock_irqsave(shost->host_lock, flags);
3209         }
3210         spin_unlock_irqrestore(shost->host_lock, flags);
3211 }
3212 EXPORT_SYMBOL(fc_block_scsi_eh);
3213
3214 /**
3215  * fc_vport_setup - allocates and creates a FC virtual port.
3216  * @shost:      scsi host the virtual port is connected to.
3217  * @channel:    Channel on shost port connected to.
3218  * @pdev:       parent device for vport
3219  * @ids:        The world wide names, FC4 port roles, etc for
3220  *              the virtual port.
3221  * @ret_vport:  The pointer to the created vport.
3222  *
3223  * Allocates and creates the vport structure, calls the parent host
3224  * to instantiate the vport, the completes w/ class and sysfs creation.
3225  *
3226  * Notes:
3227  *      This routine assumes no locks are held on entry.
3228  */
3229 static int
3230 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3231         struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
3232 {
3233         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3234         struct fc_internal *fci = to_fc_internal(shost->transportt);
3235         struct fc_vport *vport;
3236         struct device *dev;
3237         unsigned long flags;
3238         size_t size;
3239         int error;
3240
3241         *ret_vport = NULL;
3242
3243         if ( ! fci->f->vport_create)
3244                 return -ENOENT;
3245
3246         size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3247         vport = kzalloc(size, GFP_KERNEL);
3248         if (unlikely(!vport)) {
3249                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3250                 return -ENOMEM;
3251         }
3252
3253         vport->vport_state = FC_VPORT_UNKNOWN;
3254         vport->vport_last_state = FC_VPORT_UNKNOWN;
3255         vport->node_name = ids->node_name;
3256         vport->port_name = ids->port_name;
3257         vport->roles = ids->roles;
3258         vport->vport_type = ids->vport_type;
3259         if (fci->f->dd_fcvport_size)
3260                 vport->dd_data = &vport[1];
3261         vport->shost = shost;
3262         vport->channel = channel;
3263         vport->flags = FC_VPORT_CREATING;
3264         INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3265
3266         spin_lock_irqsave(shost->host_lock, flags);
3267
3268         if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3269                 spin_unlock_irqrestore(shost->host_lock, flags);
3270                 kfree(vport);
3271                 return -ENOSPC;
3272         }
3273         fc_host->npiv_vports_inuse++;
3274         vport->number = fc_host->next_vport_number++;
3275         list_add_tail(&vport->peers, &fc_host->vports);
3276         get_device(&shost->shost_gendev);       /* for fc_host->vport list */
3277
3278         spin_unlock_irqrestore(shost->host_lock, flags);
3279
3280         dev = &vport->dev;
3281         device_initialize(dev);                 /* takes self reference */
3282         dev->parent = get_device(pdev);         /* takes parent reference */
3283         dev->release = fc_vport_dev_release;
3284         dev_set_name(dev, "vport-%d:%d-%d",
3285                      shost->host_no, channel, vport->number);
3286         transport_setup_device(dev);
3287
3288         error = device_add(dev);
3289         if (error) {
3290                 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3291                 goto delete_vport;
3292         }
3293         transport_add_device(dev);
3294         transport_configure_device(dev);
3295
3296         error = fci->f->vport_create(vport, ids->disable);
3297         if (error) {
3298                 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3299                 goto delete_vport_all;
3300         }
3301
3302         /*
3303          * if the parent isn't the physical adapter's Scsi_Host, ensure
3304          * the Scsi_Host at least contains ia symlink to the vport.
3305          */
3306         if (pdev != &shost->shost_gendev) {
3307                 error = sysfs_create_link(&shost->shost_gendev.kobj,
3308                                  &dev->kobj, dev_name(dev));
3309                 if (error)
3310                         printk(KERN_ERR
3311                                 "%s: Cannot create vport symlinks for "
3312                                 "%s, err=%d\n",
3313                                 __func__, dev_name(dev), error);
3314         }
3315         spin_lock_irqsave(shost->host_lock, flags);
3316         vport->flags &= ~FC_VPORT_CREATING;
3317         spin_unlock_irqrestore(shost->host_lock, flags);
3318
3319         dev_printk(KERN_NOTICE, pdev,
3320                         "%s created via shost%d channel %d\n", dev_name(dev),
3321                         shost->host_no, channel);
3322
3323         *ret_vport = vport;
3324
3325         return 0;
3326
3327 delete_vport_all:
3328         transport_remove_device(dev);
3329         device_del(dev);
3330 delete_vport:
3331         transport_destroy_device(dev);
3332         spin_lock_irqsave(shost->host_lock, flags);
3333         list_del(&vport->peers);
3334         put_device(&shost->shost_gendev);       /* for fc_host->vport list */
3335         fc_host->npiv_vports_inuse--;
3336         spin_unlock_irqrestore(shost->host_lock, flags);
3337         put_device(dev->parent);
3338         kfree(vport);
3339
3340         return error;
3341 }
3342
3343 /**
3344  * fc_vport_create - Admin App or LLDD requests creation of a vport
3345  * @shost:      scsi host the virtual port is connected to.
3346  * @channel:    channel on shost port connected to.
3347  * @ids:        The world wide names, FC4 port roles, etc for
3348  *              the virtual port.
3349  *
3350  * Notes:
3351  *      This routine assumes no locks are held on entry.
3352  */
3353 struct fc_vport *
3354 fc_vport_create(struct Scsi_Host *shost, int channel,
3355         struct fc_vport_identifiers *ids)
3356 {
3357         int stat;
3358         struct fc_vport *vport;
3359
3360         stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3361                  ids, &vport);
3362         return stat ? NULL : vport;
3363 }
3364 EXPORT_SYMBOL(fc_vport_create);
3365
3366 /**
3367  * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3368  * @vport:      fc_vport to be terminated
3369  *
3370  * Calls the LLDD vport_delete() function, then deallocates and removes
3371  * the vport from the shost and object tree.
3372  *
3373  * Notes:
3374  *      This routine assumes no locks are held on entry.
3375  */
3376 int
3377 fc_vport_terminate(struct fc_vport *vport)
3378 {
3379         struct Scsi_Host *shost = vport_to_shost(vport);
3380         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3381         struct fc_internal *i = to_fc_internal(shost->transportt);
3382         struct device *dev = &vport->dev;
3383         unsigned long flags;
3384         int stat;
3385
3386         if (i->f->vport_delete)
3387                 stat = i->f->vport_delete(vport);
3388         else
3389                 stat = -ENOENT;
3390
3391         spin_lock_irqsave(shost->host_lock, flags);
3392         vport->flags &= ~FC_VPORT_DELETING;
3393         if (!stat) {
3394                 vport->flags |= FC_VPORT_DELETED;
3395                 list_del(&vport->peers);
3396                 fc_host->npiv_vports_inuse--;
3397                 put_device(&shost->shost_gendev);  /* for fc_host->vport list */
3398         }
3399         spin_unlock_irqrestore(shost->host_lock, flags);
3400
3401         if (stat)
3402                 return stat;
3403
3404         if (dev->parent != &shost->shost_gendev)
3405                 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3406         transport_remove_device(dev);
3407         device_del(dev);
3408         transport_destroy_device(dev);
3409
3410         /*
3411          * Removing our self-reference should mean our
3412          * release function gets called, which will drop the remaining
3413          * parent reference and free the data structure.
3414          */
3415         put_device(dev);                        /* for self-reference */
3416
3417         return 0; /* SUCCESS */
3418 }
3419 EXPORT_SYMBOL(fc_vport_terminate);
3420
3421 /**
3422  * fc_vport_sched_delete - workq-based delete request for a vport
3423  * @work:       vport to be deleted.
3424  */
3425 static void
3426 fc_vport_sched_delete(struct work_struct *work)
3427 {
3428         struct fc_vport *vport =
3429                 container_of(work, struct fc_vport, vport_delete_work);
3430         int stat;
3431
3432         stat = fc_vport_terminate(vport);
3433         if (stat)
3434                 dev_printk(KERN_ERR, vport->dev.parent,
3435                         "%s: %s could not be deleted created via "
3436                         "shost%d channel %d - error %d\n", __func__,
3437                         dev_name(&vport->dev), vport->shost->host_no,
3438                         vport->channel, stat);
3439 }
3440
3441
3442 /*
3443  * BSG support
3444  */
3445
3446
3447 /**
3448  * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3449  * @job:        fc_bsg_job that is to be torn down
3450  */
3451 static void
3452 fc_destroy_bsgjob(struct fc_bsg_job *job)
3453 {
3454         unsigned long flags;
3455
3456         spin_lock_irqsave(&job->job_lock, flags);
3457         if (job->ref_cnt) {
3458                 spin_unlock_irqrestore(&job->job_lock, flags);
3459                 return;
3460         }
3461         spin_unlock_irqrestore(&job->job_lock, flags);
3462
3463         put_device(job->dev);   /* release reference for the request */
3464
3465         kfree(job->request_payload.sg_list);
3466         kfree(job->reply_payload.sg_list);
3467         kfree(job);
3468 }
3469
3470 /**
3471  * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3472  *                  completed
3473  * @job:        fc_bsg_job that is complete
3474  */
3475 static void
3476 fc_bsg_jobdone(struct fc_bsg_job *job)
3477 {
3478         struct request *req = job->req;
3479         struct request *rsp = req->next_rq;
3480         int err;
3481
3482         err = job->req->errors = job->reply->result;
3483
3484         if (err < 0)
3485                 /* we're only returning the result field in the reply */
3486                 job->req->sense_len = sizeof(uint32_t);
3487         else
3488                 job->req->sense_len = job->reply_len;
3489
3490         /* we assume all request payload was transferred, residual == 0 */
3491         req->resid_len = 0;
3492
3493         if (rsp) {
3494                 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3495
3496                 /* set reply (bidi) residual */
3497                 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3498                                       rsp->resid_len);
3499         }
3500         blk_complete_request(req);
3501 }
3502
3503 /**
3504  * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3505  * @rq:        BSG request that holds the job to be destroyed
3506  */
3507 static void fc_bsg_softirq_done(struct request *rq)
3508 {
3509         struct fc_bsg_job *job = rq->special;
3510         unsigned long flags;
3511
3512         spin_lock_irqsave(&job->job_lock, flags);
3513         job->state_flags |= FC_RQST_STATE_DONE;
3514         job->ref_cnt--;
3515         spin_unlock_irqrestore(&job->job_lock, flags);
3516
3517         blk_end_request_all(rq, rq->errors);
3518         fc_destroy_bsgjob(job);
3519 }
3520
3521 /**
3522  * fc_bsg_job_timeout - handler for when a bsg request timesout
3523  * @req:        request that timed out
3524  */
3525 static enum blk_eh_timer_return
3526 fc_bsg_job_timeout(struct request *req)
3527 {
3528         struct fc_bsg_job *job = (void *) req->special;
3529         struct Scsi_Host *shost = job->shost;
3530         struct fc_internal *i = to_fc_internal(shost->transportt);
3531         unsigned long flags;
3532         int err = 0, done = 0;
3533
3534         if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3535                 return BLK_EH_RESET_TIMER;
3536
3537         spin_lock_irqsave(&job->job_lock, flags);
3538         if (job->state_flags & FC_RQST_STATE_DONE)
3539                 done = 1;
3540         else
3541                 job->ref_cnt++;
3542         spin_unlock_irqrestore(&job->job_lock, flags);
3543
3544         if (!done && i->f->bsg_timeout) {
3545                 /* call LLDD to abort the i/o as it has timed out */
3546                 err = i->f->bsg_timeout(job);
3547                 if (err == -EAGAIN) {
3548                         job->ref_cnt--;
3549                         return BLK_EH_RESET_TIMER;
3550                 } else if (err)
3551                         printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3552                                 "abort failed with status %d\n", err);
3553         }
3554
3555         /* the blk_end_sync_io() doesn't check the error */
3556         if (done)
3557                 return BLK_EH_NOT_HANDLED;
3558         else
3559                 return BLK_EH_HANDLED;
3560 }
3561
3562 static int
3563 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3564 {
3565         size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3566
3567         BUG_ON(!req->nr_phys_segments);
3568
3569         buf->sg_list = kzalloc(sz, GFP_KERNEL);
3570         if (!buf->sg_list)
3571                 return -ENOMEM;
3572         sg_init_table(buf->sg_list, req->nr_phys_segments);
3573         buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3574         buf->payload_len = blk_rq_bytes(req);
3575         return 0;
3576 }
3577
3578
3579 /**
3580  * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3581  *                   bsg request
3582  * @shost:      SCSI Host corresponding to the bsg object
3583  * @rport:      (optional) FC Remote Port corresponding to the bsg object
3584  * @req:        BSG request that needs a job structure
3585  */
3586 static int
3587 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3588         struct request *req)
3589 {
3590         struct fc_internal *i = to_fc_internal(shost->transportt);
3591         struct request *rsp = req->next_rq;
3592         struct fc_bsg_job *job;
3593         int ret;
3594
3595         BUG_ON(req->special);
3596
3597         job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3598                         GFP_KERNEL);
3599         if (!job)
3600                 return -ENOMEM;
3601
3602         /*
3603          * Note: this is a bit silly.
3604          * The request gets formatted as a SGIO v4 ioctl request, which
3605          * then gets reformatted as a blk request, which then gets
3606          * reformatted as a fc bsg request. And on completion, we have
3607          * to wrap return results such that SGIO v4 thinks it was a scsi
3608          * status.  I hope this was all worth it.
3609          */
3610
3611         req->special = job;
3612         job->shost = shost;
3613         job->rport = rport;
3614         job->req = req;
3615         if (i->f->dd_bsg_size)
3616                 job->dd_data = (void *)&job[1];
3617         spin_lock_init(&job->job_lock);
3618         job->request = (struct fc_bsg_request *)req->cmd;
3619         job->request_len = req->cmd_len;
3620         job->reply = req->sense;
3621         job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3622                                                  * allocated */
3623         if (req->bio) {
3624                 ret = fc_bsg_map_buffer(&job->request_payload, req);
3625                 if (ret)
3626                         goto failjob_rls_job;
3627         }
3628         if (rsp && rsp->bio) {
3629                 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3630                 if (ret)
3631                         goto failjob_rls_rqst_payload;
3632         }
3633         job->job_done = fc_bsg_jobdone;
3634         if (rport)
3635                 job->dev = &rport->dev;
3636         else
3637                 job->dev = &shost->shost_gendev;
3638         get_device(job->dev);           /* take a reference for the request */
3639
3640         job->ref_cnt = 1;
3641
3642         return 0;
3643
3644
3645 failjob_rls_rqst_payload:
3646         kfree(job->request_payload.sg_list);
3647 failjob_rls_job:
3648         kfree(job);
3649         return -ENOMEM;
3650 }
3651
3652
3653 enum fc_dispatch_result {
3654         FC_DISPATCH_BREAK,      /* on return, q is locked, break from q loop */
3655         FC_DISPATCH_LOCKED,     /* on return, q is locked, continue on */
3656         FC_DISPATCH_UNLOCKED,   /* on return, q is unlocked, continue on */
3657 };
3658
3659
3660 /**
3661  * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3662  * @q:          fc host request queue
3663  * @shost:      scsi host rport attached to
3664  * @job:        bsg job to be processed
3665  */
3666 static enum fc_dispatch_result
3667 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3668                          struct fc_bsg_job *job)
3669 {
3670         struct fc_internal *i = to_fc_internal(shost->transportt);
3671         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3672         int ret;
3673
3674         /* Validate the host command */
3675         switch (job->request->msgcode) {
3676         case FC_BSG_HST_ADD_RPORT:
3677                 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3678                 break;
3679
3680         case FC_BSG_HST_DEL_RPORT:
3681                 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3682                 break;
3683
3684         case FC_BSG_HST_ELS_NOLOGIN:
3685                 cmdlen += sizeof(struct fc_bsg_host_els);
3686                 /* there better be a xmt and rcv payloads */
3687                 if ((!job->request_payload.payload_len) ||
3688                     (!job->reply_payload.payload_len)) {
3689                         ret = -EINVAL;
3690                         goto fail_host_msg;
3691                 }
3692                 break;
3693
3694         case FC_BSG_HST_CT:
3695                 cmdlen += sizeof(struct fc_bsg_host_ct);
3696                 /* there better be xmt and rcv payloads */
3697                 if ((!job->request_payload.payload_len) ||
3698                     (!job->reply_payload.payload_len)) {
3699                         ret = -EINVAL;
3700                         goto fail_host_msg;
3701                 }
3702                 break;
3703
3704         case FC_BSG_HST_VENDOR:
3705                 cmdlen += sizeof(struct fc_bsg_host_vendor);
3706                 if ((shost->hostt->vendor_id == 0L) ||
3707                     (job->request->rqst_data.h_vendor.vendor_id !=
3708                         shost->hostt->vendor_id)) {
3709                         ret = -ESRCH;
3710                         goto fail_host_msg;
3711                 }
3712                 break;
3713
3714         default:
3715                 ret = -EBADR;
3716                 goto fail_host_msg;
3717         }
3718
3719         /* check if we really have all the request data needed */
3720         if (job->request_len < cmdlen) {
3721                 ret = -ENOMSG;
3722                 goto fail_host_msg;
3723         }
3724
3725         ret = i->f->bsg_request(job);
3726         if (!ret)
3727                 return FC_DISPATCH_UNLOCKED;
3728
3729 fail_host_msg:
3730         /* return the errno failure code as the only status */
3731         BUG_ON(job->reply_len < sizeof(uint32_t));
3732         job->reply->reply_payload_rcv_len = 0;
3733         job->reply->result = ret;
3734         job->reply_len = sizeof(uint32_t);
3735         fc_bsg_jobdone(job);
3736         return FC_DISPATCH_UNLOCKED;
3737 }
3738
3739
3740 /*
3741  * fc_bsg_goose_queue - restart rport queue in case it was stopped
3742  * @rport:      rport to be restarted
3743  */
3744 static void
3745 fc_bsg_goose_queue(struct fc_rport *rport)
3746 {
3747         int flagset;
3748         unsigned long flags;
3749
3750         if (!rport->rqst_q)
3751                 return;
3752
3753         get_device(&rport->dev);
3754
3755         spin_lock_irqsave(rport->rqst_q->queue_lock, flags);
3756         flagset = test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags) &&
3757                   !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags);
3758         if (flagset)
3759                 queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q);
3760         __blk_run_queue(rport->rqst_q);
3761         if (flagset)
3762                 queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q);
3763         spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags);
3764
3765         put_device(&rport->dev);
3766 }
3767
3768
3769 /**
3770  * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3771  * @q:          rport request queue
3772  * @shost:      scsi host rport attached to
3773  * @rport:      rport request destined to
3774  * @job:        bsg job to be processed
3775  */
3776 static enum fc_dispatch_result
3777 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3778                          struct fc_rport *rport, struct fc_bsg_job *job)
3779 {
3780         struct fc_internal *i = to_fc_internal(shost->transportt);
3781         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3782         int ret;
3783
3784         /* Validate the rport command */
3785         switch (job->request->msgcode) {
3786         case FC_BSG_RPT_ELS:
3787                 cmdlen += sizeof(struct fc_bsg_rport_els);
3788                 goto check_bidi;
3789
3790         case FC_BSG_RPT_CT:
3791                 cmdlen += sizeof(struct fc_bsg_rport_ct);
3792 check_bidi:
3793                 /* there better be xmt and rcv payloads */
3794                 if ((!job->request_payload.payload_len) ||
3795                     (!job->reply_payload.payload_len)) {
3796                         ret = -EINVAL;
3797                         goto fail_rport_msg;
3798                 }
3799                 break;
3800         default:
3801                 ret = -EBADR;
3802                 goto fail_rport_msg;
3803         }
3804
3805         /* check if we really have all the request data needed */
3806         if (job->request_len < cmdlen) {
3807                 ret = -ENOMSG;
3808                 goto fail_rport_msg;
3809         }
3810
3811         ret = i->f->bsg_request(job);
3812         if (!ret)
3813                 return FC_DISPATCH_UNLOCKED;
3814
3815 fail_rport_msg:
3816         /* return the errno failure code as the only status */
3817         BUG_ON(job->reply_len < sizeof(uint32_t));
3818         job->reply->reply_payload_rcv_len = 0;
3819         job->reply->result = ret;
3820         job->reply_len = sizeof(uint32_t);
3821         fc_bsg_jobdone(job);
3822         return FC_DISPATCH_UNLOCKED;
3823 }
3824
3825
3826 /**
3827  * fc_bsg_request_handler - generic handler for bsg requests
3828  * @q:          request queue to manage
3829  * @shost:      Scsi_Host related to the bsg object
3830  * @rport:      FC remote port related to the bsg object (optional)
3831  * @dev:        device structure for bsg object
3832  */
3833 static void
3834 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3835                        struct fc_rport *rport, struct device *dev)
3836 {
3837         struct request *req;
3838         struct fc_bsg_job *job;
3839         enum fc_dispatch_result ret;
3840
3841         if (!get_device(dev))
3842                 return;
3843
3844         while (!blk_queue_plugged(q)) {
3845                 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
3846                     !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3847                         break;
3848
3849                 req = blk_fetch_request(q);
3850                 if (!req)
3851                         break;
3852
3853                 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3854                         req->errors = -ENXIO;
3855                         spin_unlock_irq(q->queue_lock);
3856                         blk_end_request_all(req, -ENXIO);
3857                         spin_lock_irq(q->queue_lock);
3858                         continue;
3859                 }
3860
3861                 spin_unlock_irq(q->queue_lock);
3862
3863                 ret = fc_req_to_bsgjob(shost, rport, req);
3864                 if (ret) {
3865                         req->errors = ret;
3866                         blk_end_request_all(req, ret);
3867                         spin_lock_irq(q->queue_lock);
3868                         continue;
3869                 }
3870
3871                 job = req->special;
3872
3873                 /* check if we have the msgcode value at least */
3874                 if (job->request_len < sizeof(uint32_t)) {
3875                         BUG_ON(job->reply_len < sizeof(uint32_t));
3876                         job->reply->reply_payload_rcv_len = 0;
3877                         job->reply->result = -ENOMSG;
3878                         job->reply_len = sizeof(uint32_t);
3879                         fc_bsg_jobdone(job);
3880                         spin_lock_irq(q->queue_lock);
3881                         continue;
3882                 }
3883
3884                 /* the dispatch routines will unlock the queue_lock */
3885                 if (rport)
3886                         ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3887                 else
3888                         ret = fc_bsg_host_dispatch(q, shost, job);
3889
3890                 /* did dispatcher hit state that can't process any more */
3891                 if (ret == FC_DISPATCH_BREAK)
3892                         break;
3893
3894                 /* did dispatcher had released the lock */
3895                 if (ret == FC_DISPATCH_UNLOCKED)
3896                         spin_lock_irq(q->queue_lock);
3897         }
3898
3899         spin_unlock_irq(q->queue_lock);
3900         put_device(dev);
3901         spin_lock_irq(q->queue_lock);
3902 }
3903
3904
3905 /**
3906  * fc_bsg_host_handler - handler for bsg requests for a fc host
3907  * @q:          fc host request queue
3908  */
3909 static void
3910 fc_bsg_host_handler(struct request_queue *q)
3911 {
3912         struct Scsi_Host *shost = q->queuedata;
3913
3914         fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
3915 }
3916
3917
3918 /**
3919  * fc_bsg_rport_handler - handler for bsg requests for a fc rport
3920  * @q:          rport request queue
3921  */
3922 static void
3923 fc_bsg_rport_handler(struct request_queue *q)
3924 {
3925         struct fc_rport *rport = q->queuedata;
3926         struct Scsi_Host *shost = rport_to_shost(rport);
3927
3928         fc_bsg_request_handler(q, shost, rport, &rport->dev);
3929 }
3930
3931
3932 /**
3933  * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
3934  * @shost:      shost for fc_host
3935  * @fc_host:    fc_host adding the structures to
3936  */
3937 static int
3938 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
3939 {
3940         struct device *dev = &shost->shost_gendev;
3941         struct fc_internal *i = to_fc_internal(shost->transportt);
3942         struct request_queue *q;
3943         int err;
3944         char bsg_name[20];
3945
3946         fc_host->rqst_q = NULL;
3947
3948         if (!i->f->bsg_request)
3949                 return -ENOTSUPP;
3950
3951         snprintf(bsg_name, sizeof(bsg_name),
3952                  "fc_host%d", shost->host_no);
3953
3954         q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
3955         if (!q) {
3956                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3957                                 "initialize - no request queue\n",
3958                                  shost->host_no);
3959                 return -ENOMEM;
3960         }
3961
3962         q->queuedata = shost;
3963         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3964         blk_queue_softirq_done(q, fc_bsg_softirq_done);
3965         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3966         blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
3967
3968         err = bsg_register_queue(q, dev, bsg_name, NULL);
3969         if (err) {
3970                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3971                                 "initialize - register queue\n",
3972                                 shost->host_no);
3973                 blk_cleanup_queue(q);
3974                 return err;
3975         }
3976
3977         fc_host->rqst_q = q;
3978         return 0;
3979 }
3980
3981
3982 /**
3983  * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
3984  * @shost:      shost that rport is attached to
3985  * @rport:      rport that the bsg hooks are being attached to
3986  */
3987 static int
3988 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
3989 {
3990         struct device *dev = &rport->dev;
3991         struct fc_internal *i = to_fc_internal(shost->transportt);
3992         struct request_queue *q;
3993         int err;
3994
3995         rport->rqst_q = NULL;
3996
3997         if (!i->f->bsg_request)
3998                 return -ENOTSUPP;
3999
4000         q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
4001         if (!q) {
4002                 printk(KERN_ERR "%s: bsg interface failed to "
4003                                 "initialize - no request queue\n",
4004                                  dev->kobj.name);
4005                 return -ENOMEM;
4006         }
4007
4008         q->queuedata = rport;
4009         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4010         blk_queue_softirq_done(q, fc_bsg_softirq_done);
4011         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4012         blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4013
4014         err = bsg_register_queue(q, dev, NULL, NULL);
4015         if (err) {
4016                 printk(KERN_ERR "%s: bsg interface failed to "
4017                                 "initialize - register queue\n",
4018                                  dev->kobj.name);
4019                 blk_cleanup_queue(q);
4020                 return err;
4021         }
4022
4023         rport->rqst_q = q;
4024         return 0;
4025 }
4026
4027
4028 /**
4029  * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4030  * @q:  the request_queue that is to be torn down.
4031  */
4032 static void
4033 fc_bsg_remove(struct request_queue *q)
4034 {
4035         if (q) {
4036                 bsg_unregister_queue(q);
4037                 blk_cleanup_queue(q);
4038         }
4039 }
4040
4041
4042 /* Original Author:  Martin Hicks */
4043 MODULE_AUTHOR("James Smart");
4044 MODULE_DESCRIPTION("FC Transport Attributes");
4045 MODULE_LICENSE("GPL");
4046
4047 module_init(fc_transport_init);
4048 module_exit(fc_transport_exit);