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 <scsi/scsi_device.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_fc.h>
  34 #include <scsi/scsi_cmnd.h>
  35 #include <linux/netlink.h>
  36 #include <net/netlink.h>
  37 #include <scsi/scsi_netlink_fc.h>
  38 #include <scsi/scsi_bsg_fc.h>
  39 #include "scsi_priv.h"
  40 #include "scsi_transport_fc_internal.h"
  41
  42 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  43 static void fc_vport_sched_delete(struct work_struct *work);
  44 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
  45         struct device *pdev, struct fc_vport_identifiers  *ids,
  46         struct fc_vport **vport);
  47 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
  48 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
  49 static void fc_bsg_remove(struct request_queue *);
  50 static void fc_bsg_goose_queue(struct fc_rport *);
  51
  52 /*
  53  * Redefine so that we can have same named attributes in the
  54  * sdev/starget/host objects.
  55  */
  56 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)                \
  57 struct device_attribute device_attr_##_prefix##_##_name =       \
  58         __ATTR(_name,_mode,_show,_store)
  59
  60 #define fc_enum_name_search(title, table_type, table)                   \
  61 static const char *get_fc_##title##_name(enum table_type table_key)     \
  62 {                                                                       \
  63         int i;                                                          \
  64         char *name = NULL;                                              \
  65                                                                         \
  66         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  67                 if (table[i].value == table_key) {                      \
  68                         name = table[i].name;                           \
  69                         break;                                          \
  70                 }                                                       \
  71         }                                                               \
  72         return name;                                                    \
  73 }
  74
  75 #define fc_enum_name_match(title, table_type, table)                    \
  76 static int get_fc_##title##_match(const char *table_key,                \
  77                 enum table_type *value)                                 \
  78 {                                                                       \
  79         int i;                                                          \
  80                                                                         \
  81         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  82                 if (strncmp(table_key, table[i].name,                   \
  83                                 table[i].matchlen) == 0) {              \
  84                         *value = table[i].value;                        \
  85                         return 0; /* success */                         \
  86                 }                                                       \
  87         }                                                               \
  88         return 1; /* failure */                                         \
  89 }
  90
  91
  92 /* Convert fc_port_type values to ascii string name */
  93 static struct {
  94         enum fc_port_type       value;
  95         char                    *name;
  96 } fc_port_type_names[] = {
  97         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
  98         { FC_PORTTYPE_OTHER,            "Other" },
  99         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
 100         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
 101         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
 102         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
 103         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection)" },
 104         { FC_PORTTYPE_NPIV,             "NPIV VPORT" },
 105 };
 106 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
 107 #define FC_PORTTYPE_MAX_NAMELEN         50
 108
 109 /* Reuse fc_port_type enum function for vport_type */
 110 #define get_fc_vport_type_name get_fc_port_type_name
 111
 112
 113 /* Convert fc_host_event_code values to ascii string name */
 114 static const struct {
 115         enum fc_host_event_code         value;
 116         char                            *name;
 117 } fc_host_event_code_names[] = {
 118         { FCH_EVT_LIP,                  "lip" },
 119         { FCH_EVT_LINKUP,               "link_up" },
 120         { FCH_EVT_LINKDOWN,             "link_down" },
 121         { FCH_EVT_LIPRESET,             "lip_reset" },
 122         { FCH_EVT_RSCN,                 "rscn" },
 123         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
 124         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
 125         { FCH_EVT_PORT_ONLINE,          "port_online" },
 126         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
 127         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
 128         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
 129         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
 130 };
 131 fc_enum_name_search(host_event_code, fc_host_event_code,
 132                 fc_host_event_code_names)
 133 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
 134
 135
 136 /* Convert fc_port_state values to ascii string name */
 137 static struct {
 138         enum fc_port_state      value;
 139         char                    *name;
 140 } fc_port_state_names[] = {
 141         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
 142         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 143         { FC_PORTSTATE_ONLINE,          "Online" },
 144         { FC_PORTSTATE_OFFLINE,         "Offline" },
 145         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 146         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 147         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 148         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 149         { FC_PORTSTATE_ERROR,           "Error" },
 150         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 151         { FC_PORTSTATE_DELETED,         "Deleted" },
 152 };
 153 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 154 #define FC_PORTSTATE_MAX_NAMELEN        20
 155
 156
 157 /* Convert fc_vport_state values to ascii string name */
 158 static struct {
 159         enum fc_vport_state     value;
 160         char                    *name;
 161 } fc_vport_state_names[] = {
 162         { FC_VPORT_UNKNOWN,             "Unknown" },
 163         { FC_VPORT_ACTIVE,              "Active" },
 164         { FC_VPORT_DISABLED,            "Disabled" },
 165         { FC_VPORT_LINKDOWN,            "Linkdown" },
 166         { FC_VPORT_INITIALIZING,        "Initializing" },
 167         { FC_VPORT_NO_FABRIC_SUPP,      "No Fabric Support" },
 168         { FC_VPORT_NO_FABRIC_RSCS,      "No Fabric Resources" },
 169         { FC_VPORT_FABRIC_LOGOUT,       "Fabric Logout" },
 170         { FC_VPORT_FABRIC_REJ_WWN,      "Fabric Rejected WWN" },
 171         { FC_VPORT_FAILED,              "VPort Failed" },
 172 };
 173 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
 174 #define FC_VPORTSTATE_MAX_NAMELEN       24
 175
 176 /* Reuse fc_vport_state enum function for vport_last_state */
 177 #define get_fc_vport_last_state_name get_fc_vport_state_name
 178
 179
 180 /* Convert fc_tgtid_binding_type values to ascii string name */
 181 static const struct {
 182         enum fc_tgtid_binding_type      value;
 183         char                            *name;
 184         int                             matchlen;
 185 } fc_tgtid_binding_type_names[] = {
 186         { FC_TGTID_BIND_NONE, "none", 4 },
 187         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 188         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 189         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 190 };
 191 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 192                 fc_tgtid_binding_type_names)
 193 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 194                 fc_tgtid_binding_type_names)
 195 #define FC_BINDTYPE_MAX_NAMELEN 30
 196
 197
 198 #define fc_bitfield_name_search(title, table)                   \
 199 static ssize_t                                                  \
 200 get_fc_##title##_names(u32 table_key, char *buf)                \
 201 {                                                               \
 202         char *prefix = "";                                      \
 203         ssize_t len = 0;                                        \
 204         int i;                                                  \
 205                                                                 \
 206         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 207                 if (table[i].value & table_key) {               \
 208                         len += sprintf(buf + len, "%s%s",       \
 209                                 prefix, table[i].name);         \
 210                         prefix = ", ";                          \
 211                 }                                               \
 212         }                                                       \
 213         len += sprintf(buf + len, "\n");                        \
 214         return len;                                             \
 215 }
 216
 217
 218 /* Convert FC_COS bit values to ascii string name */
 219 static const struct {
 220         u32                     value;
 221         char                    *name;
 222 } fc_cos_names[] = {
 223         { FC_COS_CLASS1,        "Class 1" },
 224         { FC_COS_CLASS2,        "Class 2" },
 225         { FC_COS_CLASS3,        "Class 3" },
 226         { FC_COS_CLASS4,        "Class 4" },
 227         { FC_COS_CLASS6,        "Class 6" },
 228 };
 229 fc_bitfield_name_search(cos, fc_cos_names)
 230
 231
 232 /* Convert FC_PORTSPEED bit values to ascii string name */
 233 static const struct {
 234         u32                     value;
 235         char                    *name;
 236 } fc_port_speed_names[] = {
 237         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 238         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 239         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 240         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 241         { FC_PORTSPEED_8GBIT,           "8 Gbit" },
 242         { FC_PORTSPEED_16GBIT,          "16 Gbit" },
 243         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 244 };
 245 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 246
 247
 248 static int
 249 show_fc_fc4s (char *buf, u8 *fc4_list)
 250 {
 251         int i, len=0;
 252
 253         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 254                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 255         len += sprintf(buf + len, "\n");
 256         return len;
 257 }
 258
 259
 260 /* Convert FC_PORT_ROLE bit values to ascii string name */
 261 static const struct {
 262         u32                     value;
 263         char                    *name;
 264 } fc_port_role_names[] = {
 265         { FC_PORT_ROLE_FCP_TARGET,      "FCP Target" },
 266         { FC_PORT_ROLE_FCP_INITIATOR,   "FCP Initiator" },
 267         { FC_PORT_ROLE_IP_PORT,         "IP Port" },
 268 };
 269 fc_bitfield_name_search(port_roles, fc_port_role_names)
 270
 271 /*
 272  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 273  */
 274 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 275 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 276 #define FC_FPORT_PORTID                 0x00000e
 277 #define FC_FABCTLR_PORTID               0x00000d
 278 #define FC_DIRSRVR_PORTID               0x00000c
 279 #define FC_TIMESRVR_PORTID              0x00000b
 280 #define FC_MGMTSRVR_PORTID              0x00000a
 281
 282
 283 static void fc_timeout_deleted_rport(struct work_struct *work);
 284 static void fc_timeout_fail_rport_io(struct work_struct *work);
 285 static void fc_scsi_scan_rport(struct work_struct *work);
 286
 287 /*
 288  * Attribute counts pre object type...
 289  * Increase these values if you add attributes
 290  */
 291 #define FC_STARGET_NUM_ATTRS    3
 292 #define FC_RPORT_NUM_ATTRS      10
 293 #define FC_VPORT_NUM_ATTRS      9
 294 #define FC_HOST_NUM_ATTRS       21
 295
 296 struct fc_internal {
 297         struct scsi_transport_template t;
 298         struct fc_function_template *f;
 299
 300         /*
 301          * For attributes : each object has :
 302          *   An array of the actual attributes structures
 303          *   An array of null-terminated pointers to the attribute
 304          *     structures - used for mid-layer interaction.
 305          *
 306          * The attribute containers for the starget and host are are
 307          * part of the midlayer. As the remote port is specific to the
 308          * fc transport, we must provide the attribute container.
 309          */
 310         struct device_attribute private_starget_attrs[
 311                                                         FC_STARGET_NUM_ATTRS];
 312         struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 313
 314         struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 315         struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 316
 317         struct transport_container rport_attr_cont;
 318         struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 319         struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 320
 321         struct transport_container vport_attr_cont;
 322         struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
 323         struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
 324 };
 325
 326 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 327
 328 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 329                            struct device *cdev)
 330 {
 331         struct scsi_target *starget = to_scsi_target(dev);
 332         struct fc_rport *rport = starget_to_rport(starget);
 333
 334         /*
 335          * if parent is remote port, use values from remote port.
 336          * Otherwise, this host uses the fc_transport, but not the
 337          * remote port interface. As such, initialize to known non-values.
 338          */
 339         if (rport) {
 340                 fc_starget_node_name(starget) = rport->node_name;
 341                 fc_starget_port_name(starget) = rport->port_name;
 342                 fc_starget_port_id(starget) = rport->port_id;
 343         } else {
 344                 fc_starget_node_name(starget) = -1;
 345                 fc_starget_port_name(starget) = -1;
 346                 fc_starget_port_id(starget) = -1;
 347         }
 348
 349         return 0;
 350 }
 351
 352 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 353                                "fc_transport",
 354                                fc_target_setup,
 355                                NULL,
 356                                NULL);
 357
 358 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 359                          struct device *cdev)
 360 {
 361         struct Scsi_Host *shost = dev_to_shost(dev);
 362         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 363
 364         /*
 365          * Set default values easily detected by the midlayer as
 366          * failure cases.  The scsi lldd is responsible for initializing
 367          * all transport attributes to valid values per host.
 368          */
 369         fc_host->node_name = -1;
 370         fc_host->port_name = -1;
 371         fc_host->permanent_port_name = -1;
 372         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 373         memset(fc_host->supported_fc4s, 0,
 374                 sizeof(fc_host->supported_fc4s));
 375         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 376         fc_host->maxframe_size = -1;
 377         fc_host->max_npiv_vports = 0;
 378         memset(fc_host->serial_number, 0,
 379                 sizeof(fc_host->serial_number));
 380
 381         fc_host->port_id = -1;
 382         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 383         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 384         memset(fc_host->active_fc4s, 0,
 385                 sizeof(fc_host->active_fc4s));
 386         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 387         fc_host->fabric_name = -1;
 388         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 389         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
 390
 391         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 392
 393         INIT_LIST_HEAD(&fc_host->rports);
 394         INIT_LIST_HEAD(&fc_host->rport_bindings);
 395         INIT_LIST_HEAD(&fc_host->vports);
 396         fc_host->next_rport_number = 0;
 397         fc_host->next_target_id = 0;
 398         fc_host->next_vport_number = 0;
 399         fc_host->npiv_vports_inuse = 0;
 400
 401         snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
 402                  "fc_wq_%d", shost->host_no);
 403         fc_host->work_q = create_singlethread_workqueue(
 404                                         fc_host->work_q_name);
 405         if (!fc_host->work_q)
 406                 return -ENOMEM;
 407
 408         snprintf(fc_host->devloss_work_q_name,
 409                  sizeof(fc_host->devloss_work_q_name),
 410                  "fc_dl_%d", shost->host_no);
 411         fc_host->devloss_work_q = create_singlethread_workqueue(
 412                                         fc_host->devloss_work_q_name);
 413         if (!fc_host->devloss_work_q) {
 414                 destroy_workqueue(fc_host->work_q);
 415                 fc_host->work_q = NULL;
 416                 return -ENOMEM;
 417         }
 418
 419         fc_bsg_hostadd(shost, fc_host);
 420         /* ignore any bsg add error - we just can't do sgio */
 421
 422         return 0;
 423 }
 424
 425 static int fc_host_remove(struct transport_container *tc, struct device *dev,
 426                          struct device *cdev)
 427 {
 428         struct Scsi_Host *shost = dev_to_shost(dev);
 429         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 430
 431         fc_bsg_remove(fc_host->rqst_q);
 432         return 0;
 433 }
 434
 435 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 436                                "fc_host",
 437                                fc_host_setup,
 438                                fc_host_remove,
 439                                NULL);
 440
 441 /*
 442  * Setup and Remove actions for remote ports are handled
 443  * in the service functions below.
 444  */
 445 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 446                                "fc_remote_ports",
 447                                NULL,
 448                                NULL,
 449                                NULL);
 450
 451 /*
 452  * Setup and Remove actions for virtual ports are handled
 453  * in the service functions below.
 454  */
 455 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
 456                                "fc_vports",
 457                                NULL,
 458                                NULL,
 459                                NULL);
 460
 461 /*
 462  * Module Parameters
 463  */
 464
 465 /*
 466  * dev_loss_tmo: the default number of seconds that the FC transport
 467  *   should insulate the loss of a remote port.
 468  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 469  */
 470 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
 471
 472 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
 473 MODULE_PARM_DESC(dev_loss_tmo,
 474                  "Maximum number of seconds that the FC transport should"
 475                  " insulate the loss of a remote port. Once this value is"
 476                  " exceeded, the scsi target is removed. Value should be"
 477                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
 478
 479 /*
 480  * Netlink Infrastructure
 481  */
 482
 483 static atomic_t fc_event_seq;
 484
 485 /**
 486  * fc_get_event_number - Obtain the next sequential FC event number
 487  *
 488  * Notes:
 489  *   We could have inlined this, but it would have required fc_event_seq to
 490  *   be exposed. For now, live with the subroutine call.
 491  *   Atomic used to avoid lock/unlock...
 492  */
 493 u32
 494 fc_get_event_number(void)
 495 {
 496         return atomic_add_return(1, &fc_event_seq);
 497 }
 498 EXPORT_SYMBOL(fc_get_event_number);
 499
 500
 501 /**
 502  * fc_host_post_event - called to post an even on an fc_host.
 503  * @shost:              host the event occurred on
 504  * @event_number:       fc event number obtained from get_fc_event_number()
 505  * @event_code:         fc_host event being posted
 506  * @event_data:         32bits of data for the event being posted
 507  *
 508  * Notes:
 509  *      This routine assumes no locks are held on entry.
 510  */
 511 void
 512 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
 513                 enum fc_host_event_code event_code, u32 event_data)
 514 {
 515         struct sk_buff *skb;
 516         struct nlmsghdr *nlh;
 517         struct fc_nl_event *event;
 518         const char *name;
 519         u32 len, skblen;
 520         int err;
 521
 522         if (!scsi_nl_sock) {
 523                 err = -ENOENT;
 524                 goto send_fail;
 525         }
 526
 527         len = FC_NL_MSGALIGN(sizeof(*event));
 528         skblen = NLMSG_SPACE(len);
 529
 530         skb = alloc_skb(skblen, GFP_KERNEL);
 531         if (!skb) {
 532                 err = -ENOBUFS;
 533                 goto send_fail;
 534         }
 535
 536         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 537                                 skblen - sizeof(*nlh), 0);
 538         if (!nlh) {
 539                 err = -ENOBUFS;
 540                 goto send_fail_skb;
 541         }
 542         event = NLMSG_DATA(nlh);
 543
 544         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 545                                 FC_NL_ASYNC_EVENT, len);
 546         event->seconds = get_seconds();
 547         event->vendor_id = 0;
 548         event->host_no = shost->host_no;
 549         event->event_datalen = sizeof(u32);     /* bytes */
 550         event->event_num = event_number;
 551         event->event_code = event_code;
 552         event->event_data = event_data;
 553
 554         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 555                         GFP_KERNEL);
 556         return;
 557
 558 send_fail_skb:
 559         kfree_skb(skb);
 560 send_fail:
 561         name = get_fc_host_event_code_name(event_code);
 562         printk(KERN_WARNING
 563                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
 564                 __func__, shost->host_no,
 565                 (name) ? name : "<unknown>", event_data, err);
 566         return;
 567 }
 568 EXPORT_SYMBOL(fc_host_post_event);
 569
 570
 571 /**
 572  * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
 573  * @shost:              host the event occurred on
 574  * @event_number:       fc event number obtained from get_fc_event_number()
 575  * @data_len:           amount, in bytes, of vendor unique data
 576  * @data_buf:           pointer to vendor unique data
 577  * @vendor_id:          Vendor id
 578  *
 579  * Notes:
 580  *      This routine assumes no locks are held on entry.
 581  */
 582 void
 583 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
 584                 u32 data_len, char * data_buf, u64 vendor_id)
 585 {
 586         struct sk_buff *skb;
 587         struct nlmsghdr *nlh;
 588         struct fc_nl_event *event;
 589         u32 len, skblen;
 590         int err;
 591
 592         if (!scsi_nl_sock) {
 593                 err = -ENOENT;
 594                 goto send_vendor_fail;
 595         }
 596
 597         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
 598         skblen = NLMSG_SPACE(len);
 599
 600         skb = alloc_skb(skblen, GFP_KERNEL);
 601         if (!skb) {
 602                 err = -ENOBUFS;
 603                 goto send_vendor_fail;
 604         }
 605
 606         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 607                                 skblen - sizeof(*nlh), 0);
 608         if (!nlh) {
 609                 err = -ENOBUFS;
 610                 goto send_vendor_fail_skb;
 611         }
 612         event = NLMSG_DATA(nlh);
 613
 614         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 615                                 FC_NL_ASYNC_EVENT, len);
 616         event->seconds = get_seconds();
 617         event->vendor_id = vendor_id;
 618         event->host_no = shost->host_no;
 619         event->event_datalen = data_len;        /* bytes */
 620         event->event_num = event_number;
 621         event->event_code = FCH_EVT_VENDOR_UNIQUE;
 622         memcpy(&event->event_data, data_buf, data_len);
 623
 624         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 625                         GFP_KERNEL);
 626         return;
 627
 628 send_vendor_fail_skb:
 629         kfree_skb(skb);
 630 send_vendor_fail:
 631         printk(KERN_WARNING
 632                 "%s: Dropped Event : host %d vendor_unique - err %d\n",
 633                 __func__, shost->host_no, err);
 634         return;
 635 }
 636 EXPORT_SYMBOL(fc_host_post_vendor_event);
 637
 638
 639
 640 static __init int fc_transport_init(void)
 641 {
 642         int error;
 643
 644         atomic_set(&fc_event_seq, 0);
 645
 646         error = transport_class_register(&fc_host_class);
 647         if (error)
 648                 return error;
 649         error = transport_class_register(&fc_vport_class);
 650         if (error)
 651                 return error;
 652         error = transport_class_register(&fc_rport_class);
 653         if (error)
 654                 return error;
 655         return transport_class_register(&fc_transport_class);
 656 }
 657
 658 static void __exit fc_transport_exit(void)
 659 {
 660         transport_class_unregister(&fc_transport_class);
 661         transport_class_unregister(&fc_rport_class);
 662         transport_class_unregister(&fc_host_class);
 663         transport_class_unregister(&fc_vport_class);
 664 }
 665
 666 /*
 667  * FC Remote Port Attribute Management
 668  */
 669
 670 #define fc_rport_show_function(field, format_string, sz, cast)          \
 671 static ssize_t                                                          \
 672 show_fc_rport_##field (struct device *dev,                              \
 673                        struct device_attribute *attr, char *buf)        \
 674 {                                                                       \
 675         struct fc_rport *rport = transport_class_to_rport(dev);         \
 676         struct Scsi_Host *shost = rport_to_shost(rport);                \
 677         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 678         if ((i->f->get_rport_##field) &&                                \
 679             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 680               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 681               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 682                 i->f->get_rport_##field(rport);                         \
 683         return snprintf(buf, sz, format_string, cast rport->field);     \
 684 }
 685
 686 #define fc_rport_store_function(field)                                  \
 687 static ssize_t                                                          \
 688 store_fc_rport_##field(struct device *dev,                              \
 689                        struct device_attribute *attr,                   \
 690                        const char *buf, size_t count)                   \
 691 {                                                                       \
 692         int val;                                                        \
 693         struct fc_rport *rport = transport_class_to_rport(dev);         \
 694         struct Scsi_Host *shost = rport_to_shost(rport);                \
 695         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 696         char *cp;                                                       \
 697         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
 698             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
 699             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
 700                 return -EBUSY;                                          \
 701         val = simple_strtoul(buf, &cp, 0);                              \
 702         if (*cp && (*cp != '\n'))                                       \
 703                 return -EINVAL;                                         \
 704         i->f->set_rport_##field(rport, val);                            \
 705         return count;                                                   \
 706 }
 707
 708 #define fc_rport_rd_attr(field, format_string, sz)                      \
 709         fc_rport_show_function(field, format_string, sz, )              \
 710 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 711                          show_fc_rport_##field, NULL)
 712
 713 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 714         fc_rport_show_function(field, format_string, sz, (cast))        \
 715 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 716                           show_fc_rport_##field, NULL)
 717
 718 #define fc_rport_rw_attr(field, format_string, sz)                      \
 719         fc_rport_show_function(field, format_string, sz, )              \
 720         fc_rport_store_function(field)                                  \
 721 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,          \
 722                         show_fc_rport_##field,                          \
 723                         store_fc_rport_##field)
 724
 725
 726 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 727 static ssize_t                                                          \
 728 show_fc_rport_##field (struct device *dev,                              \
 729                        struct device_attribute *attr, char *buf)        \
 730 {                                                                       \
 731         struct fc_rport *rport = transport_class_to_rport(dev);         \
 732         return snprintf(buf, sz, format_string, cast rport->field);     \
 733 }
 734
 735 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 736         fc_private_rport_show_function(field, format_string, sz, )      \
 737 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 738                          show_fc_rport_##field, NULL)
 739
 740 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 741         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 742 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 743                           show_fc_rport_##field, NULL)
 744
 745
 746 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 747 static ssize_t                                                          \
 748 show_fc_rport_##title (struct device *dev,                              \
 749                        struct device_attribute *attr, char *buf)        \
 750 {                                                                       \
 751         struct fc_rport *rport = transport_class_to_rport(dev);         \
 752         const char *name;                                               \
 753         name = get_fc_##title##_name(rport->title);                     \
 754         if (!name)                                                      \
 755                 return -EINVAL;                                         \
 756         return snprintf(buf, maxlen, "%s\n", name);                     \
 757 }                                                                       \
 758 static FC_DEVICE_ATTR(rport, title, S_IRUGO,                    \
 759                         show_fc_rport_##title, NULL)
 760
 761
 762 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 763         i->private_rport_attrs[count] = device_attr_rport_##field; \
 764         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 765         i->private_rport_attrs[count].store = NULL;                     \
 766         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 767         if (i->f->show_rport_##field)                                   \
 768                 count++
 769
 770 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 771         i->private_rport_attrs[count] = device_attr_rport_##field; \
 772         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 773         i->private_rport_attrs[count].store = NULL;                     \
 774         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 775         count++
 776
 777 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 778         i->private_rport_attrs[count] = device_attr_rport_##field; \
 779         if (!i->f->set_rport_##field) {                                 \
 780                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 781                 i->private_rport_attrs[count].store = NULL;             \
 782         }                                                               \
 783         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 784         if (i->f->show_rport_##field)                                   \
 785                 count++
 786
 787 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
 788 {                                                                       \
 789         i->private_rport_attrs[count] = device_attr_rport_##field; \
 790         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 791         count++;                                                        \
 792 }
 793
 794
 795 /* The FC Transport Remote Port Attributes: */
 796
 797 /* Fixed Remote Port Attributes */
 798
 799 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 800
 801 static ssize_t
 802 show_fc_rport_supported_classes (struct device *dev,
 803                                  struct device_attribute *attr, char *buf)
 804 {
 805         struct fc_rport *rport = transport_class_to_rport(dev);
 806         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 807                 return snprintf(buf, 20, "unspecified\n");
 808         return get_fc_cos_names(rport->supported_classes, buf);
 809 }
 810 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 811                 show_fc_rport_supported_classes, NULL);
 812
 813 /* Dynamic Remote Port Attributes */
 814
 815 /*
 816  * dev_loss_tmo attribute
 817  */
 818 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
 819 static ssize_t
 820 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
 821                             const char *buf, size_t count)
 822 {
 823         int val;
 824         struct fc_rport *rport = transport_class_to_rport(dev);
 825         struct Scsi_Host *shost = rport_to_shost(rport);
 826         struct fc_internal *i = to_fc_internal(shost->transportt);
 827         char *cp;
 828         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 829             (rport->port_state == FC_PORTSTATE_DELETED) ||
 830             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 831                 return -EBUSY;
 832         val = simple_strtoul(buf, &cp, 0);
 833         if ((*cp && (*cp != '\n')) ||
 834             (val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
 835                 return -EINVAL;
 836         i->f->set_rport_dev_loss_tmo(rport, val);
 837         return count;
 838 }
 839 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
 840                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
 841
 842
 843 /* Private Remote Port Attributes */
 844
 845 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 846 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 847 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 848
 849 static ssize_t
 850 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
 851                      char *buf)
 852 {
 853         struct fc_rport *rport = transport_class_to_rport(dev);
 854
 855         /* identify any roles that are port_id specific */
 856         if ((rport->port_id != -1) &&
 857             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 858                                         FC_WELLKNOWN_PORTID_MASK) {
 859                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 860                 case FC_FPORT_PORTID:
 861                         return snprintf(buf, 30, "Fabric Port\n");
 862                 case FC_FABCTLR_PORTID:
 863                         return snprintf(buf, 30, "Fabric Controller\n");
 864                 case FC_DIRSRVR_PORTID:
 865                         return snprintf(buf, 30, "Directory Server\n");
 866                 case FC_TIMESRVR_PORTID:
 867                         return snprintf(buf, 30, "Time Server\n");
 868                 case FC_MGMTSRVR_PORTID:
 869                         return snprintf(buf, 30, "Management Server\n");
 870                 default:
 871                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 872                 }
 873         } else {
 874                 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
 875                         return snprintf(buf, 20, "unknown\n");
 876                 return get_fc_port_roles_names(rport->roles, buf);
 877         }
 878 }
 879 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
 880                 show_fc_rport_roles, NULL);
 881
 882 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 883 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 884
 885 /*
 886  * fast_io_fail_tmo attribute
 887  */
 888 static ssize_t
 889 show_fc_rport_fast_io_fail_tmo (struct device *dev,
 890                                 struct device_attribute *attr, char *buf)
 891 {
 892         struct fc_rport *rport = transport_class_to_rport(dev);
 893
 894         if (rport->fast_io_fail_tmo == -1)
 895                 return snprintf(buf, 5, "off\n");
 896         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
 897 }
 898
 899 static ssize_t
 900 store_fc_rport_fast_io_fail_tmo(struct device *dev,
 901                                 struct device_attribute *attr, const char *buf,
 902                                 size_t count)
 903 {
 904         int val;
 905         char *cp;
 906         struct fc_rport *rport = transport_class_to_rport(dev);
 907
 908         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 909             (rport->port_state == FC_PORTSTATE_DELETED) ||
 910             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 911                 return -EBUSY;
 912         if (strncmp(buf, "off", 3) == 0)
 913                 rport->fast_io_fail_tmo = -1;
 914         else {
 915                 val = simple_strtoul(buf, &cp, 0);
 916                 if ((*cp && (*cp != '\n')) ||
 917                     (val < 0) || (val >= rport->dev_loss_tmo))
 918                         return -EINVAL;
 919                 rport->fast_io_fail_tmo = val;
 920         }
 921         return count;
 922 }
 923 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
 924         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
 925
 926
 927 /*
 928  * FC SCSI Target Attribute Management
 929  */
 930
 931 /*
 932  * Note: in the target show function we recognize when the remote
 933  *  port is in the heirarchy and do not allow the driver to get
 934  *  involved in sysfs functions. The driver only gets involved if
 935  *  it's the "old" style that doesn't use rports.
 936  */
 937 #define fc_starget_show_function(field, format_string, sz, cast)        \
 938 static ssize_t                                                          \
 939 show_fc_starget_##field (struct device *dev,                            \
 940                          struct device_attribute *attr, char *buf)      \
 941 {                                                                       \
 942         struct scsi_target *starget = transport_class_to_starget(dev);  \
 943         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 944         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 945         struct fc_rport *rport = starget_to_rport(starget);             \
 946         if (rport)                                                      \
 947                 fc_starget_##field(starget) = rport->field;             \
 948         else if (i->f->get_starget_##field)                             \
 949                 i->f->get_starget_##field(starget);                     \
 950         return snprintf(buf, sz, format_string,                         \
 951                 cast fc_starget_##field(starget));                      \
 952 }
 953
 954 #define fc_starget_rd_attr(field, format_string, sz)                    \
 955         fc_starget_show_function(field, format_string, sz, )            \
 956 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
 957                          show_fc_starget_##field, NULL)
 958
 959 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
 960         fc_starget_show_function(field, format_string, sz, (cast))      \
 961 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
 962                           show_fc_starget_##field, NULL)
 963
 964 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
 965         i->private_starget_attrs[count] = device_attr_starget_##field; \
 966         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
 967         i->private_starget_attrs[count].store = NULL;                   \
 968         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 969         if (i->f->show_starget_##field)                                 \
 970                 count++
 971
 972 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
 973         i->private_starget_attrs[count] = device_attr_starget_##field; \
 974         if (!i->f->set_starget_##field) {                               \
 975                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
 976                 i->private_starget_attrs[count].store = NULL;           \
 977         }                                                               \
 978         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 979         if (i->f->show_starget_##field)                                 \
 980                 count++
 981
 982 /* The FC Transport SCSI Target Attributes: */
 983 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 984 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 985 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
 986
 987
 988 /*
 989  * FC Virtual Port Attribute Management
 990  */
 991
 992 #define fc_vport_show_function(field, format_string, sz, cast)          \
 993 static ssize_t                                                          \
 994 show_fc_vport_##field (struct device *dev,                              \
 995                        struct device_attribute *attr, char *buf)        \
 996 {                                                                       \
 997         struct fc_vport *vport = transport_class_to_vport(dev);         \
 998         struct Scsi_Host *shost = vport_to_shost(vport);                \
 999         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1000         if ((i->f->get_vport_##field) &&                                \
1001             !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))       \
1002                 i->f->get_vport_##field(vport);                         \
1003         return snprintf(buf, sz, format_string, cast vport->field);     \
1004 }
1005
1006 #define fc_vport_store_function(field)                                  \
1007 static ssize_t                                                          \
1008 store_fc_vport_##field(struct device *dev,                              \
1009                        struct device_attribute *attr,                   \
1010                        const char *buf, size_t count)                   \
1011 {                                                                       \
1012         int val;                                                        \
1013         struct fc_vport *vport = transport_class_to_vport(dev);         \
1014         struct Scsi_Host *shost = vport_to_shost(vport);                \
1015         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1016         char *cp;                                                       \
1017         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))  \
1018                 return -EBUSY;                                          \
1019         val = simple_strtoul(buf, &cp, 0);                              \
1020         if (*cp && (*cp != '\n'))                                       \
1021                 return -EINVAL;                                         \
1022         i->f->set_vport_##field(vport, val);                            \
1023         return count;                                                   \
1024 }
1025
1026 #define fc_vport_store_str_function(field, slen)                        \
1027 static ssize_t                                                          \
1028 store_fc_vport_##field(struct device *dev,                              \
1029                        struct device_attribute *attr,                   \
1030                        const char *buf, size_t count)                   \
1031 {                                                                       \
1032         struct fc_vport *vport = transport_class_to_vport(dev);         \
1033         struct Scsi_Host *shost = vport_to_shost(vport);                \
1034         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1035         unsigned int cnt=count;                                         \
1036                                                                         \
1037         /* count may include a LF at end of string */                   \
1038         if (buf[cnt-1] == '\n')                                         \
1039                 cnt--;                                                  \
1040         if (cnt > ((slen) - 1))                                         \
1041                 return -EINVAL;                                         \
1042         memcpy(vport->field, buf, cnt);                                 \
1043         i->f->set_vport_##field(vport);                                 \
1044         return count;                                                   \
1045 }
1046
1047 #define fc_vport_rd_attr(field, format_string, sz)                      \
1048         fc_vport_show_function(field, format_string, sz, )              \
1049 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1050                          show_fc_vport_##field, NULL)
1051
1052 #define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
1053         fc_vport_show_function(field, format_string, sz, (cast))        \
1054 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1055                           show_fc_vport_##field, NULL)
1056
1057 #define fc_vport_rw_attr(field, format_string, sz)                      \
1058         fc_vport_show_function(field, format_string, sz, )              \
1059         fc_vport_store_function(field)                                  \
1060 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1061                         show_fc_vport_##field,                          \
1062                         store_fc_vport_##field)
1063
1064 #define fc_private_vport_show_function(field, format_string, sz, cast)  \
1065 static ssize_t                                                          \
1066 show_fc_vport_##field (struct device *dev,                              \
1067                        struct device_attribute *attr, char *buf)        \
1068 {                                                                       \
1069         struct fc_vport *vport = transport_class_to_vport(dev);         \
1070         return snprintf(buf, sz, format_string, cast vport->field);     \
1071 }
1072
1073 #define fc_private_vport_store_u32_function(field)                      \
1074 static ssize_t                                                          \
1075 store_fc_vport_##field(struct device *dev,                              \
1076                        struct device_attribute *attr,                   \
1077                        const char *buf, size_t count)                   \
1078 {                                                                       \
1079         u32 val;                                                        \
1080         struct fc_vport *vport = transport_class_to_vport(dev);         \
1081         char *cp;                                                       \
1082         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))          \
1083                 return -EBUSY;                                          \
1084         val = simple_strtoul(buf, &cp, 0);                              \
1085         if (*cp && (*cp != '\n'))                                       \
1086                 return -EINVAL;                                         \
1087         vport->field = val;                                             \
1088         return count;                                                   \
1089 }
1090
1091
1092 #define fc_private_vport_rd_attr(field, format_string, sz)              \
1093         fc_private_vport_show_function(field, format_string, sz, )      \
1094 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1095                          show_fc_vport_##field, NULL)
1096
1097 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
1098         fc_private_vport_show_function(field, format_string, sz, (cast)) \
1099 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1100                           show_fc_vport_##field, NULL)
1101
1102 #define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
1103         fc_private_vport_show_function(field, format_string, sz, )      \
1104         fc_private_vport_store_u32_function(field)                      \
1105 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1106                         show_fc_vport_##field,                          \
1107                         store_fc_vport_##field)
1108
1109
1110 #define fc_private_vport_rd_enum_attr(title, maxlen)                    \
1111 static ssize_t                                                          \
1112 show_fc_vport_##title (struct device *dev,                              \
1113                        struct device_attribute *attr,                   \
1114                        char *buf)                                       \
1115 {                                                                       \
1116         struct fc_vport *vport = transport_class_to_vport(dev);         \
1117         const char *name;                                               \
1118         name = get_fc_##title##_name(vport->title);                     \
1119         if (!name)                                                      \
1120                 return -EINVAL;                                         \
1121         return snprintf(buf, maxlen, "%s\n", name);                     \
1122 }                                                                       \
1123 static FC_DEVICE_ATTR(vport, title, S_IRUGO,                    \
1124                         show_fc_vport_##title, NULL)
1125
1126
1127 #define SETUP_VPORT_ATTRIBUTE_RD(field)                                 \
1128         i->private_vport_attrs[count] = device_attr_vport_##field; \
1129         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1130         i->private_vport_attrs[count].store = NULL;                     \
1131         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1132         if (i->f->get_##field)                                          \
1133                 count++
1134         /* NOTE: Above MACRO differs: checks function not show bit */
1135
1136 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                         \
1137         i->private_vport_attrs[count] = device_attr_vport_##field; \
1138         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1139         i->private_vport_attrs[count].store = NULL;                     \
1140         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1141         count++
1142
1143 #define SETUP_VPORT_ATTRIBUTE_WR(field)                                 \
1144         i->private_vport_attrs[count] = device_attr_vport_##field; \
1145         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1146         if (i->f->field)                                                \
1147                 count++
1148         /* NOTE: Above MACRO differs: checks function */
1149
1150 #define SETUP_VPORT_ATTRIBUTE_RW(field)                                 \
1151         i->private_vport_attrs[count] = device_attr_vport_##field; \
1152         if (!i->f->set_vport_##field) {                                 \
1153                 i->private_vport_attrs[count].attr.mode = S_IRUGO;      \
1154                 i->private_vport_attrs[count].store = NULL;             \
1155         }                                                               \
1156         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1157         count++
1158         /* NOTE: Above MACRO differs: does not check show bit */
1159
1160 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                         \
1161 {                                                                       \
1162         i->private_vport_attrs[count] = device_attr_vport_##field; \
1163         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1164         count++;                                                        \
1165 }
1166
1167
1168 /* The FC Transport Virtual Port Attributes: */
1169
1170 /* Fixed Virtual Port Attributes */
1171
1172 /* Dynamic Virtual Port Attributes */
1173
1174 /* Private Virtual Port Attributes */
1175
1176 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1177 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1178 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1179 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1180
1181 static ssize_t
1182 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1183                      char *buf)
1184 {
1185         struct fc_vport *vport = transport_class_to_vport(dev);
1186
1187         if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1188                 return snprintf(buf, 20, "unknown\n");
1189         return get_fc_port_roles_names(vport->roles, buf);
1190 }
1191 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1192
1193 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1194
1195 fc_private_vport_show_function(symbolic_name, "%s\n",
1196                 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1197 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1198 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1199                 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1200
1201 static ssize_t
1202 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1203                       const char *buf, size_t count)
1204 {
1205         struct fc_vport *vport = transport_class_to_vport(dev);
1206         struct Scsi_Host *shost = vport_to_shost(vport);
1207
1208         fc_queue_work(shost, &vport->vport_delete_work);
1209         return count;
1210 }
1211 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1212                         NULL, store_fc_vport_delete);
1213
1214
1215 /*
1216  * Enable/Disable vport
1217  *  Write "1" to disable, write "0" to enable
1218  */
1219 static ssize_t
1220 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1221                        const char *buf,
1222                            size_t count)
1223 {
1224         struct fc_vport *vport = transport_class_to_vport(dev);
1225         struct Scsi_Host *shost = vport_to_shost(vport);
1226         struct fc_internal *i = to_fc_internal(shost->transportt);
1227         int stat;
1228
1229         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1230                 return -EBUSY;
1231
1232         if (*buf == '0') {
1233                 if (vport->vport_state != FC_VPORT_DISABLED)
1234                         return -EALREADY;
1235         } else if (*buf == '1') {
1236                 if (vport->vport_state == FC_VPORT_DISABLED)
1237                         return -EALREADY;
1238         } else
1239                 return -EINVAL;
1240
1241         stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1242         return stat ? stat : count;
1243 }
1244 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1245                         NULL, store_fc_vport_disable);
1246
1247
1248 /*
1249  * Host Attribute Management
1250  */
1251
1252 #define fc_host_show_function(field, format_string, sz, cast)           \
1253 static ssize_t                                                          \
1254 show_fc_host_##field (struct device *dev,                               \
1255                       struct device_attribute *attr, char *buf)         \
1256 {                                                                       \
1257         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1258         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1259         if (i->f->get_host_##field)                                     \
1260                 i->f->get_host_##field(shost);                          \
1261         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1262 }
1263
1264 #define fc_host_store_function(field)                                   \
1265 static ssize_t                                                          \
1266 store_fc_host_##field(struct device *dev,                               \
1267                       struct device_attribute *attr,                    \
1268                       const char *buf,  size_t count)                   \
1269 {                                                                       \
1270         int val;                                                        \
1271         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1272         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1273         char *cp;                                                       \
1274                                                                         \
1275         val = simple_strtoul(buf, &cp, 0);                              \
1276         if (*cp && (*cp != '\n'))                                       \
1277                 return -EINVAL;                                         \
1278         i->f->set_host_##field(shost, val);                             \
1279         return count;                                                   \
1280 }
1281
1282 #define fc_host_store_str_function(field, slen)                         \
1283 static ssize_t                                                          \
1284 store_fc_host_##field(struct device *dev,                               \
1285                       struct device_attribute *attr,                    \
1286                       const char *buf, size_t count)                    \
1287 {                                                                       \
1288         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1289         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1290         unsigned int cnt=count;                                         \
1291                                                                         \
1292         /* count may include a LF at end of string */                   \
1293         if (buf[cnt-1] == '\n')                                         \
1294                 cnt--;                                                  \
1295         if (cnt > ((slen) - 1))                                         \
1296                 return -EINVAL;                                         \
1297         memcpy(fc_host_##field(shost), buf, cnt);                       \
1298         i->f->set_host_##field(shost);                                  \
1299         return count;                                                   \
1300 }
1301
1302 #define fc_host_rd_attr(field, format_string, sz)                       \
1303         fc_host_show_function(field, format_string, sz, )               \
1304 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1305                          show_fc_host_##field, NULL)
1306
1307 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
1308         fc_host_show_function(field, format_string, sz, (cast))         \
1309 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1310                           show_fc_host_##field, NULL)
1311
1312 #define fc_host_rw_attr(field, format_string, sz)                       \
1313         fc_host_show_function(field, format_string, sz, )               \
1314         fc_host_store_function(field)                                   \
1315 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,           \
1316                         show_fc_host_##field,                           \
1317                         store_fc_host_##field)
1318
1319 #define fc_host_rd_enum_attr(title, maxlen)                             \
1320 static ssize_t                                                          \
1321 show_fc_host_##title (struct device *dev,                               \
1322                       struct device_attribute *attr, char *buf)         \
1323 {                                                                       \
1324         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1325         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1326         const char *name;                                               \
1327         if (i->f->get_host_##title)                                     \
1328                 i->f->get_host_##title(shost);                          \
1329         name = get_fc_##title##_name(fc_host_##title(shost));           \
1330         if (!name)                                                      \
1331                 return -EINVAL;                                         \
1332         return snprintf(buf, maxlen, "%s\n", name);                     \
1333 }                                                                       \
1334 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1335
1336 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
1337         i->private_host_attrs[count] = device_attr_host_##field;        \
1338         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1339         i->private_host_attrs[count].store = NULL;                      \
1340         i->host_attrs[count] = &i->private_host_attrs[count];           \
1341         if (i->f->show_host_##field)                                    \
1342                 count++
1343
1344 #define SETUP_HOST_ATTRIBUTE_RD_NS(field)                               \
1345         i->private_host_attrs[count] = device_attr_host_##field;        \
1346         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1347         i->private_host_attrs[count].store = NULL;                      \
1348         i->host_attrs[count] = &i->private_host_attrs[count];           \
1349         count++
1350
1351 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1352         i->private_host_attrs[count] = device_attr_host_##field;        \
1353         if (!i->f->set_host_##field) {                                  \
1354                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1355                 i->private_host_attrs[count].store = NULL;              \
1356         }                                                               \
1357         i->host_attrs[count] = &i->private_host_attrs[count];           \
1358         if (i->f->show_host_##field)                                    \
1359                 count++
1360
1361
1362 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1363 static ssize_t                                                          \
1364 show_fc_host_##field (struct device *dev,                               \
1365                       struct device_attribute *attr, char *buf)         \
1366 {                                                                       \
1367         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1368         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1369 }
1370
1371 #define fc_private_host_rd_attr(field, format_string, sz)               \
1372         fc_private_host_show_function(field, format_string, sz, )       \
1373 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1374                          show_fc_host_##field, NULL)
1375
1376 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1377         fc_private_host_show_function(field, format_string, sz, (cast)) \
1378 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1379                           show_fc_host_##field, NULL)
1380
1381 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1382         i->private_host_attrs[count] = device_attr_host_##field;        \
1383         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1384         i->private_host_attrs[count].store = NULL;                      \
1385         i->host_attrs[count] = &i->private_host_attrs[count];           \
1386         count++
1387
1388 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1389 {                                                                       \
1390         i->private_host_attrs[count] = device_attr_host_##field;        \
1391         i->host_attrs[count] = &i->private_host_attrs[count];           \
1392         count++;                                                        \
1393 }
1394
1395
1396 /* Fixed Host Attributes */
1397
1398 static ssize_t
1399 show_fc_host_supported_classes (struct device *dev,
1400                                 struct device_attribute *attr, char *buf)
1401 {
1402         struct Scsi_Host *shost = transport_class_to_shost(dev);
1403
1404         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1405                 return snprintf(buf, 20, "unspecified\n");
1406
1407         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1408 }
1409 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1410                 show_fc_host_supported_classes, NULL);
1411
1412 static ssize_t
1413 show_fc_host_supported_fc4s (struct device *dev,
1414                              struct device_attribute *attr, char *buf)
1415 {
1416         struct Scsi_Host *shost = transport_class_to_shost(dev);
1417         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1418 }
1419 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1420                 show_fc_host_supported_fc4s, NULL);
1421
1422 static ssize_t
1423 show_fc_host_supported_speeds (struct device *dev,
1424                                struct device_attribute *attr, char *buf)
1425 {
1426         struct Scsi_Host *shost = transport_class_to_shost(dev);
1427
1428         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1429                 return snprintf(buf, 20, "unknown\n");
1430
1431         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1432 }
1433 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1434                 show_fc_host_supported_speeds, NULL);
1435
1436
1437 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1438 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1439 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1440                              unsigned long long);
1441 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1442 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1443 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1444
1445
1446 /* Dynamic Host Attributes */
1447
1448 static ssize_t
1449 show_fc_host_active_fc4s (struct device *dev,
1450                           struct device_attribute *attr, char *buf)
1451 {
1452         struct Scsi_Host *shost = transport_class_to_shost(dev);
1453         struct fc_internal *i = to_fc_internal(shost->transportt);
1454
1455         if (i->f->get_host_active_fc4s)
1456                 i->f->get_host_active_fc4s(shost);
1457
1458         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1459 }
1460 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1461                 show_fc_host_active_fc4s, NULL);
1462
1463 static ssize_t
1464 show_fc_host_speed (struct device *dev,
1465                     struct device_attribute *attr, char *buf)
1466 {
1467         struct Scsi_Host *shost = transport_class_to_shost(dev);
1468         struct fc_internal *i = to_fc_internal(shost->transportt);
1469
1470         if (i->f->get_host_speed)
1471                 i->f->get_host_speed(shost);
1472
1473         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1474                 return snprintf(buf, 20, "unknown\n");
1475
1476         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1477 }
1478 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1479                 show_fc_host_speed, NULL);
1480
1481
1482 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1483 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1484 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1485 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1486 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1487
1488 fc_private_host_show_function(system_hostname, "%s\n",
1489                 FC_SYMBOLIC_NAME_SIZE + 1, )
1490 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1491 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1492                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1493
1494
1495 /* Private Host Attributes */
1496
1497 static ssize_t
1498 show_fc_private_host_tgtid_bind_type(struct device *dev,
1499                                      struct device_attribute *attr, char *buf)
1500 {
1501         struct Scsi_Host *shost = transport_class_to_shost(dev);
1502         const char *name;
1503
1504         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1505         if (!name)
1506                 return -EINVAL;
1507         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1508 }
1509
1510 #define get_list_head_entry(pos, head, member)          \
1511         pos = list_entry((head)->next, typeof(*pos), member)
1512
1513 static ssize_t
1514 store_fc_private_host_tgtid_bind_type(struct device *dev,
1515         struct device_attribute *attr, const char *buf, size_t count)
1516 {
1517         struct Scsi_Host *shost = transport_class_to_shost(dev);
1518         struct fc_rport *rport;
1519         enum fc_tgtid_binding_type val;
1520         unsigned long flags;
1521
1522         if (get_fc_tgtid_bind_type_match(buf, &val))
1523                 return -EINVAL;
1524
1525         /* if changing bind type, purge all unused consistent bindings */
1526         if (val != fc_host_tgtid_bind_type(shost)) {
1527                 spin_lock_irqsave(shost->host_lock, flags);
1528                 while (!list_empty(&fc_host_rport_bindings(shost))) {
1529                         get_list_head_entry(rport,
1530                                 &fc_host_rport_bindings(shost), peers);
1531                         list_del(&rport->peers);
1532                         rport->port_state = FC_PORTSTATE_DELETED;
1533                         fc_queue_work(shost, &rport->rport_delete_work);
1534                 }
1535                 spin_unlock_irqrestore(shost->host_lock, flags);
1536         }
1537
1538         fc_host_tgtid_bind_type(shost) = val;
1539         return count;
1540 }
1541
1542 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1543                         show_fc_private_host_tgtid_bind_type,
1544                         store_fc_private_host_tgtid_bind_type);
1545
1546 static ssize_t
1547 store_fc_private_host_issue_lip(struct device *dev,
1548         struct device_attribute *attr, const char *buf, size_t count)
1549 {
1550         struct Scsi_Host *shost = transport_class_to_shost(dev);
1551         struct fc_internal *i = to_fc_internal(shost->transportt);
1552         int ret;
1553
1554         /* ignore any data value written to the attribute */
1555         if (i->f->issue_fc_host_lip) {
1556                 ret = i->f->issue_fc_host_lip(shost);
1557                 return ret ? ret: count;
1558         }
1559
1560         return -ENOENT;
1561 }
1562
1563 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1564                         store_fc_private_host_issue_lip);
1565
1566 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1567
1568
1569 /*
1570  * Host Statistics Management
1571  */
1572
1573 /* Show a given an attribute in the statistics group */
1574 static ssize_t
1575 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1576 {
1577         struct Scsi_Host *shost = transport_class_to_shost(dev);
1578         struct fc_internal *i = to_fc_internal(shost->transportt);
1579         struct fc_host_statistics *stats;
1580         ssize_t ret = -ENOENT;
1581
1582         if (offset > sizeof(struct fc_host_statistics) ||
1583             offset % sizeof(u64) != 0)
1584                 WARN_ON(1);
1585
1586         if (i->f->get_fc_host_stats) {
1587                 stats = (i->f->get_fc_host_stats)(shost);
1588                 if (stats)
1589                         ret = snprintf(buf, 20, "0x%llx\n",
1590                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1591         }
1592         return ret;
1593 }
1594
1595
1596 /* generate a read-only statistics attribute */
1597 #define fc_host_statistic(name)                                         \
1598 static ssize_t show_fcstat_##name(struct device *cd,                    \
1599                                   struct device_attribute *attr,        \
1600                                   char *buf)                            \
1601 {                                                                       \
1602         return fc_stat_show(cd, buf,                                    \
1603                             offsetof(struct fc_host_statistics, name)); \
1604 }                                                                       \
1605 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1606
1607 fc_host_statistic(seconds_since_last_reset);
1608 fc_host_statistic(tx_frames);
1609 fc_host_statistic(tx_words);
1610 fc_host_statistic(rx_frames);
1611 fc_host_statistic(rx_words);
1612 fc_host_statistic(lip_count);
1613 fc_host_statistic(nos_count);
1614 fc_host_statistic(error_frames);
1615 fc_host_statistic(dumped_frames);
1616 fc_host_statistic(link_failure_count);
1617 fc_host_statistic(loss_of_sync_count);
1618 fc_host_statistic(loss_of_signal_count);
1619 fc_host_statistic(prim_seq_protocol_err_count);
1620 fc_host_statistic(invalid_tx_word_count);
1621 fc_host_statistic(invalid_crc_count);
1622 fc_host_statistic(fcp_input_requests);
1623 fc_host_statistic(fcp_output_requests);
1624 fc_host_statistic(fcp_control_requests);
1625 fc_host_statistic(fcp_input_megabytes);
1626 fc_host_statistic(fcp_output_megabytes);
1627
1628 static ssize_t
1629 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1630                     const char *buf, size_t count)
1631 {
1632         struct Scsi_Host *shost = transport_class_to_shost(dev);
1633         struct fc_internal *i = to_fc_internal(shost->transportt);
1634
1635         /* ignore any data value written to the attribute */
1636         if (i->f->reset_fc_host_stats) {
1637                 i->f->reset_fc_host_stats(shost);
1638                 return count;
1639         }
1640
1641         return -ENOENT;
1642 }
1643 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1644                                 fc_reset_statistics);
1645
1646 static struct attribute *fc_statistics_attrs[] = {
1647         &device_attr_host_seconds_since_last_reset.attr,
1648         &device_attr_host_tx_frames.attr,
1649         &device_attr_host_tx_words.attr,
1650         &device_attr_host_rx_frames.attr,
1651         &device_attr_host_rx_words.attr,
1652         &device_attr_host_lip_count.attr,
1653         &device_attr_host_nos_count.attr,
1654         &device_attr_host_error_frames.attr,
1655         &device_attr_host_dumped_frames.attr,
1656         &device_attr_host_link_failure_count.attr,
1657         &device_attr_host_loss_of_sync_count.attr,
1658         &device_attr_host_loss_of_signal_count.attr,
1659         &device_attr_host_prim_seq_protocol_err_count.attr,
1660         &device_attr_host_invalid_tx_word_count.attr,
1661         &device_attr_host_invalid_crc_count.attr,
1662         &device_attr_host_fcp_input_requests.attr,
1663         &device_attr_host_fcp_output_requests.attr,
1664         &device_attr_host_fcp_control_requests.attr,
1665         &device_attr_host_fcp_input_megabytes.attr,
1666         &device_attr_host_fcp_output_megabytes.attr,
1667         &device_attr_host_reset_statistics.attr,
1668         NULL
1669 };
1670
1671 static struct attribute_group fc_statistics_group = {
1672         .name = "statistics",
1673         .attrs = fc_statistics_attrs,
1674 };
1675
1676
1677 /* Host Vport Attributes */
1678
1679 static int
1680 fc_parse_wwn(const char *ns, u64 *nm)
1681 {
1682         unsigned int i, j;
1683         u8 wwn[8];
1684
1685         memset(wwn, 0, sizeof(wwn));
1686
1687         /* Validate and store the new name */
1688         for (i=0, j=0; i < 16; i++) {
1689                 if ((*ns >= 'a') && (*ns <= 'f'))
1690                         j = ((j << 4) | ((*ns++ -'a') + 10));
1691                 else if ((*ns >= 'A') && (*ns <= 'F'))
1692                         j = ((j << 4) | ((*ns++ -'A') + 10));
1693                 else if ((*ns >= '0') && (*ns <= '9'))
1694                         j = ((j << 4) | (*ns++ -'0'));
1695                 else
1696                         return -EINVAL;
1697                 if (i % 2) {
1698                         wwn[i/2] = j & 0xff;
1699                         j = 0;
1700                 }
1701         }
1702
1703         *nm = wwn_to_u64(wwn);
1704
1705         return 0;
1706 }
1707
1708
1709 /*
1710  * "Short-cut" sysfs variable to create a new vport on a FC Host.
1711  * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1712  * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1713  * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1714  */
1715 static ssize_t
1716 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1717                            const char *buf, size_t count)
1718 {
1719         struct Scsi_Host *shost = transport_class_to_shost(dev);
1720         struct fc_vport_identifiers vid;
1721         struct fc_vport *vport;
1722         unsigned int cnt=count;
1723         int stat;
1724
1725         memset(&vid, 0, sizeof(vid));
1726
1727         /* count may include a LF at end of string */
1728         if (buf[cnt-1] == '\n')
1729                 cnt--;
1730
1731         /* validate we have enough characters for WWPN */
1732         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1733                 return -EINVAL;
1734
1735         stat = fc_parse_wwn(&buf[0], &vid.port_name);
1736         if (stat)
1737                 return stat;
1738
1739         stat = fc_parse_wwn(&buf[17], &vid.node_name);
1740         if (stat)
1741                 return stat;
1742
1743         vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1744         vid.vport_type = FC_PORTTYPE_NPIV;
1745         /* vid.symbolic_name is already zero/NULL's */
1746         vid.disable = false;            /* always enabled */
1747
1748         /* we only allow support on Channel 0 !!! */
1749         stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1750         return stat ? stat : count;
1751 }
1752 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1753                         store_fc_host_vport_create);
1754
1755
1756 /*
1757  * "Short-cut" sysfs variable to delete a vport on a FC Host.
1758  * Vport is identified by a string containing "<WWPN>:<WWNN>".
1759  * The WWNs are specified as hex characters, and may *not* contain
1760  * any prefixes (e.g. 0x, x, etc)
1761  */
1762 static ssize_t
1763 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1764                            const char *buf, size_t count)
1765 {
1766         struct Scsi_Host *shost = transport_class_to_shost(dev);
1767         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1768         struct fc_vport *vport;
1769         u64 wwpn, wwnn;
1770         unsigned long flags;
1771         unsigned int cnt=count;
1772         int stat, match;
1773
1774         /* count may include a LF at end of string */
1775         if (buf[cnt-1] == '\n')
1776                 cnt--;
1777
1778         /* validate we have enough characters for WWPN */
1779         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1780                 return -EINVAL;
1781
1782         stat = fc_parse_wwn(&buf[0], &wwpn);
1783         if (stat)
1784                 return stat;
1785
1786         stat = fc_parse_wwn(&buf[17], &wwnn);
1787         if (stat)
1788                 return stat;
1789
1790         spin_lock_irqsave(shost->host_lock, flags);
1791         match = 0;
1792         /* we only allow support on Channel 0 !!! */
1793         list_for_each_entry(vport, &fc_host->vports, peers) {
1794                 if ((vport->channel == 0) &&
1795                     (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1796                         match = 1;
1797                         break;
1798                 }
1799         }
1800         spin_unlock_irqrestore(shost->host_lock, flags);
1801
1802         if (!match)
1803                 return -ENODEV;
1804
1805         stat = fc_vport_terminate(vport);
1806         return stat ? stat : count;
1807 }
1808 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1809                         store_fc_host_vport_delete);
1810
1811
1812 static int fc_host_match(struct attribute_container *cont,
1813                           struct device *dev)
1814 {
1815         struct Scsi_Host *shost;
1816         struct fc_internal *i;
1817
1818         if (!scsi_is_host_device(dev))
1819                 return 0;
1820
1821         shost = dev_to_shost(dev);
1822         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1823             != &fc_host_class.class)
1824                 return 0;
1825
1826         i = to_fc_internal(shost->transportt);
1827
1828         return &i->t.host_attrs.ac == cont;
1829 }
1830
1831 static int fc_target_match(struct attribute_container *cont,
1832                             struct device *dev)
1833 {
1834         struct Scsi_Host *shost;
1835         struct fc_internal *i;
1836
1837         if (!scsi_is_target_device(dev))
1838                 return 0;
1839
1840         shost = dev_to_shost(dev->parent);
1841         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1842             != &fc_host_class.class)
1843                 return 0;
1844
1845         i = to_fc_internal(shost->transportt);
1846
1847         return &i->t.target_attrs.ac == cont;
1848 }
1849
1850 static void fc_rport_dev_release(struct device *dev)
1851 {
1852         struct fc_rport *rport = dev_to_rport(dev);
1853         put_device(dev->parent);
1854         kfree(rport);
1855 }
1856
1857 int scsi_is_fc_rport(const struct device *dev)
1858 {
1859         return dev->release == fc_rport_dev_release;
1860 }
1861 EXPORT_SYMBOL(scsi_is_fc_rport);
1862
1863 static int fc_rport_match(struct attribute_container *cont,
1864                             struct device *dev)
1865 {
1866         struct Scsi_Host *shost;
1867         struct fc_internal *i;
1868
1869         if (!scsi_is_fc_rport(dev))
1870                 return 0;
1871
1872         shost = dev_to_shost(dev->parent);
1873         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1874             != &fc_host_class.class)
1875                 return 0;
1876
1877         i = to_fc_internal(shost->transportt);
1878
1879         return &i->rport_attr_cont.ac == cont;
1880 }
1881
1882
1883 static void fc_vport_dev_release(struct device *dev)
1884 {
1885         struct fc_vport *vport = dev_to_vport(dev);
1886         put_device(dev->parent);                /* release kobj parent */
1887         kfree(vport);
1888 }
1889
1890 int scsi_is_fc_vport(const struct device *dev)
1891 {
1892         return dev->release == fc_vport_dev_release;
1893 }
1894 EXPORT_SYMBOL(scsi_is_fc_vport);
1895
1896 static int fc_vport_match(struct attribute_container *cont,
1897                             struct device *dev)
1898 {
1899         struct fc_vport *vport;
1900         struct Scsi_Host *shost;
1901         struct fc_internal *i;
1902
1903         if (!scsi_is_fc_vport(dev))
1904                 return 0;
1905         vport = dev_to_vport(dev);
1906
1907         shost = vport_to_shost(vport);
1908         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1909             != &fc_host_class.class)
1910                 return 0;
1911
1912         i = to_fc_internal(shost->transportt);
1913         return &i->vport_attr_cont.ac == cont;
1914 }
1915
1916
1917 /**
1918  * fc_timed_out - FC Transport I/O timeout intercept handler
1919  * @scmd:       The SCSI command which timed out
1920  *
1921  * This routine protects against error handlers getting invoked while a
1922  * rport is in a blocked state, typically due to a temporarily loss of
1923  * connectivity. If the error handlers are allowed to proceed, requests
1924  * to abort i/o, reset the target, etc will likely fail as there is no way
1925  * to communicate with the device to perform the requested function. These
1926  * failures may result in the midlayer taking the device offline, requiring
1927  * manual intervention to restore operation.
1928  *
1929  * This routine, called whenever an i/o times out, validates the state of
1930  * the underlying rport. If the rport is blocked, it returns
1931  * EH_RESET_TIMER, which will continue to reschedule the timeout.
1932  * Eventually, either the device will return, or devloss_tmo will fire,
1933  * and when the timeout then fires, it will be handled normally.
1934  * If the rport is not blocked, normal error handling continues.
1935  *
1936  * Notes:
1937  *      This routine assumes no locks are held on entry.
1938  */
1939 static enum blk_eh_timer_return
1940 fc_timed_out(struct scsi_cmnd *scmd)
1941 {
1942         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1943
1944         if (rport->port_state == FC_PORTSTATE_BLOCKED)
1945                 return BLK_EH_RESET_TIMER;
1946
1947         return BLK_EH_NOT_HANDLED;
1948 }
1949
1950 /*
1951  * Called by fc_user_scan to locate an rport on the shost that
1952  * matches the channel and target id, and invoke scsi_scan_target()
1953  * on the rport.
1954  */
1955 static void
1956 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1957 {
1958         struct fc_rport *rport;
1959         unsigned long flags;
1960
1961         spin_lock_irqsave(shost->host_lock, flags);
1962
1963         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1964                 if (rport->scsi_target_id == -1)
1965                         continue;
1966
1967                 if (rport->port_state != FC_PORTSTATE_ONLINE)
1968                         continue;
1969
1970                 if ((channel == rport->channel) &&
1971                     (id == rport->scsi_target_id)) {
1972                         spin_unlock_irqrestore(shost->host_lock, flags);
1973                         scsi_scan_target(&rport->dev, channel, id, lun, 1);
1974                         return;
1975                 }
1976         }
1977
1978         spin_unlock_irqrestore(shost->host_lock, flags);
1979 }
1980
1981 /*
1982  * Called via sysfs scan routines. Necessary, as the FC transport
1983  * wants to place all target objects below the rport object. So this
1984  * routine must invoke the scsi_scan_target() routine with the rport
1985  * object as the parent.
1986  */
1987 static int
1988 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1989 {
1990         uint chlo, chhi;
1991         uint tgtlo, tgthi;
1992
1993         if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
1994             ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
1995             ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1996                 return -EINVAL;
1997
1998         if (channel == SCAN_WILD_CARD) {
1999                 chlo = 0;
2000                 chhi = shost->max_channel + 1;
2001         } else {
2002                 chlo = channel;
2003                 chhi = channel + 1;
2004         }
2005
2006         if (id == SCAN_WILD_CARD) {
2007                 tgtlo = 0;
2008                 tgthi = shost->max_id;
2009         } else {
2010                 tgtlo = id;
2011                 tgthi = id + 1;
2012         }
2013
2014         for ( ; chlo < chhi; chlo++)
2015                 for ( ; tgtlo < tgthi; tgtlo++)
2016                         fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2017
2018         return 0;
2019 }
2020
2021 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2022                                 int result)
2023 {
2024         struct fc_internal *i = to_fc_internal(shost->transportt);
2025         return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2026 }
2027
2028 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2029 {
2030         struct fc_internal *i = to_fc_internal(shost->transportt);
2031         return i->f->it_nexus_response(shost, nexus, result);
2032 }
2033
2034 struct scsi_transport_template *
2035 fc_attach_transport(struct fc_function_template *ft)
2036 {
2037         int count;
2038         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2039                                         GFP_KERNEL);
2040
2041         if (unlikely(!i))
2042                 return NULL;
2043
2044         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2045         i->t.target_attrs.ac.class = &fc_transport_class.class;
2046         i->t.target_attrs.ac.match = fc_target_match;
2047         i->t.target_size = sizeof(struct fc_starget_attrs);
2048         transport_container_register(&i->t.target_attrs);
2049
2050         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2051         i->t.host_attrs.ac.class = &fc_host_class.class;
2052         i->t.host_attrs.ac.match = fc_host_match;
2053         i->t.host_size = sizeof(struct fc_host_attrs);
2054         if (ft->get_fc_host_stats)
2055                 i->t.host_attrs.statistics = &fc_statistics_group;
2056         transport_container_register(&i->t.host_attrs);
2057
2058         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2059         i->rport_attr_cont.ac.class = &fc_rport_class.class;
2060         i->rport_attr_cont.ac.match = fc_rport_match;
2061         transport_container_register(&i->rport_attr_cont);
2062
2063         i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2064         i->vport_attr_cont.ac.class = &fc_vport_class.class;
2065         i->vport_attr_cont.ac.match = fc_vport_match;
2066         transport_container_register(&i->vport_attr_cont);
2067
2068         i->f = ft;
2069
2070         /* Transport uses the shost workq for scsi scanning */
2071         i->t.create_work_queue = 1;
2072
2073         i->t.eh_timed_out = fc_timed_out;
2074
2075         i->t.user_scan = fc_user_scan;
2076
2077         /* target-mode drivers' functions */
2078         i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2079         i->t.it_nexus_response = fc_it_nexus_response;
2080
2081         /*
2082          * Setup SCSI Target Attributes.
2083          */
2084         count = 0;
2085         SETUP_STARGET_ATTRIBUTE_RD(node_name);
2086         SETUP_STARGET_ATTRIBUTE_RD(port_name);
2087         SETUP_STARGET_ATTRIBUTE_RD(port_id);
2088
2089         BUG_ON(count > FC_STARGET_NUM_ATTRS);
2090
2091         i->starget_attrs[count] = NULL;
2092
2093
2094         /*
2095          * Setup SCSI Host Attributes.
2096          */
2097         count=0;
2098         SETUP_HOST_ATTRIBUTE_RD(node_name);
2099         SETUP_HOST_ATTRIBUTE_RD(port_name);
2100         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2101         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2102         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2103         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2104         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2105         if (ft->vport_create) {
2106                 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2107                 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2108         }
2109         SETUP_HOST_ATTRIBUTE_RD(serial_number);
2110
2111         SETUP_HOST_ATTRIBUTE_RD(port_id);
2112         SETUP_HOST_ATTRIBUTE_RD(port_type);
2113         SETUP_HOST_ATTRIBUTE_RD(port_state);
2114         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2115         SETUP_HOST_ATTRIBUTE_RD(speed);
2116         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2117         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2118         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2119
2120         /* Transport-managed attributes */
2121         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2122         if (ft->issue_fc_host_lip)
2123                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2124         if (ft->vport_create)
2125                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2126         if (ft->vport_delete)
2127                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2128
2129         BUG_ON(count > FC_HOST_NUM_ATTRS);
2130
2131         i->host_attrs[count] = NULL;
2132
2133         /*
2134          * Setup Remote Port Attributes.
2135          */
2136         count=0;
2137         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2138         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2139         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2140         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2141         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2142         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2143         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2144         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2145         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2146         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2147
2148         BUG_ON(count > FC_RPORT_NUM_ATTRS);
2149
2150         i->rport_attrs[count] = NULL;
2151
2152         /*
2153          * Setup Virtual Port Attributes.
2154          */
2155         count=0;
2156         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2157         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2158         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2159         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2160         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2161         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2162         SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2163         SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2164         SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2165
2166         BUG_ON(count > FC_VPORT_NUM_ATTRS);
2167
2168         i->vport_attrs[count] = NULL;
2169
2170         return &i->t;
2171 }
2172 EXPORT_SYMBOL(fc_attach_transport);
2173
2174 void fc_release_transport(struct scsi_transport_template *t)
2175 {
2176         struct fc_internal *i = to_fc_internal(t);
2177
2178         transport_container_unregister(&i->t.target_attrs);
2179         transport_container_unregister(&i->t.host_attrs);
2180         transport_container_unregister(&i->rport_attr_cont);
2181         transport_container_unregister(&i->vport_attr_cont);
2182
2183         kfree(i);
2184 }
2185 EXPORT_SYMBOL(fc_release_transport);
2186
2187 /**
2188  * fc_queue_work - Queue work to the fc_host workqueue.
2189  * @shost:      Pointer to Scsi_Host bound to fc_host.
2190  * @work:       Work to queue for execution.
2191  *
2192  * Return value:
2193  *      1 - work queued for execution
2194  *      0 - work is already queued
2195  *      -EINVAL - work queue doesn't exist
2196  */
2197 static int
2198 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2199 {
2200         if (unlikely(!fc_host_work_q(shost))) {
2201                 printk(KERN_ERR
2202                         "ERROR: FC host '%s' attempted to queue work, "
2203                         "when no workqueue created.\n", shost->hostt->name);
2204                 dump_stack();
2205
2206                 return -EINVAL;
2207         }
2208
2209         return queue_work(fc_host_work_q(shost), work);
2210 }
2211
2212 /**
2213  * fc_flush_work - Flush a fc_host's workqueue.
2214  * @shost:      Pointer to Scsi_Host bound to fc_host.
2215  */
2216 static void
2217 fc_flush_work(struct Scsi_Host *shost)
2218 {
2219         if (!fc_host_work_q(shost)) {
2220                 printk(KERN_ERR
2221                         "ERROR: FC host '%s' attempted to flush work, "
2222                         "when no workqueue created.\n", shost->hostt->name);
2223                 dump_stack();
2224                 return;
2225         }
2226
2227         flush_workqueue(fc_host_work_q(shost));
2228 }
2229
2230 /**
2231  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2232  * @shost:      Pointer to Scsi_Host bound to fc_host.
2233  * @work:       Work to queue for execution.
2234  * @delay:      jiffies to delay the work queuing
2235  *
2236  * Return value:
2237  *      1 on success / 0 already queued / < 0 for error
2238  */
2239 static int
2240 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2241                                 unsigned long delay)
2242 {
2243         if (unlikely(!fc_host_devloss_work_q(shost))) {
2244                 printk(KERN_ERR
2245                         "ERROR: FC host '%s' attempted to queue work, "
2246                         "when no workqueue created.\n", shost->hostt->name);
2247                 dump_stack();
2248
2249                 return -EINVAL;
2250         }
2251
2252         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2253 }
2254
2255 /**
2256  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2257  * @shost:      Pointer to Scsi_Host bound to fc_host.
2258  */
2259 static void
2260 fc_flush_devloss(struct Scsi_Host *shost)
2261 {
2262         if (!fc_host_devloss_work_q(shost)) {
2263                 printk(KERN_ERR
2264                         "ERROR: FC host '%s' attempted to flush work, "
2265                         "when no workqueue created.\n", shost->hostt->name);
2266                 dump_stack();
2267                 return;
2268         }
2269
2270         flush_workqueue(fc_host_devloss_work_q(shost));
2271 }
2272
2273
2274 /**
2275  * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2276  * @shost:      Which &Scsi_Host
2277  *
2278  * This routine is expected to be called immediately preceeding the
2279  * a driver's call to scsi_remove_host().
2280  *
2281  * WARNING: A driver utilizing the fc_transport, which fails to call
2282  *   this routine prior to scsi_remove_host(), will leave dangling
2283  *   objects in /sys/class/fc_remote_ports. Access to any of these
2284  *   objects can result in a system crash !!!
2285  *
2286  * Notes:
2287  *      This routine assumes no locks are held on entry.
2288  */
2289 void
2290 fc_remove_host(struct Scsi_Host *shost)
2291 {
2292         struct fc_vport *vport = NULL, *next_vport = NULL;
2293         struct fc_rport *rport = NULL, *next_rport = NULL;
2294         struct workqueue_struct *work_q;
2295         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2296         unsigned long flags;
2297
2298         spin_lock_irqsave(shost->host_lock, flags);
2299
2300         /* Remove any vports */
2301         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2302                 fc_queue_work(shost, &vport->vport_delete_work);
2303
2304         /* Remove any remote ports */
2305         list_for_each_entry_safe(rport, next_rport,
2306                         &fc_host->rports, peers) {
2307                 list_del(&rport->peers);
2308                 rport->port_state = FC_PORTSTATE_DELETED;
2309                 fc_queue_work(shost, &rport->rport_delete_work);
2310         }
2311
2312         list_for_each_entry_safe(rport, next_rport,
2313                         &fc_host->rport_bindings, peers) {
2314                 list_del(&rport->peers);
2315                 rport->port_state = FC_PORTSTATE_DELETED;
2316                 fc_queue_work(shost, &rport->rport_delete_work);
2317         }
2318
2319         spin_unlock_irqrestore(shost->host_lock, flags);
2320
2321         /* flush all scan work items */
2322         scsi_flush_work(shost);
2323
2324         /* flush all stgt delete, and rport delete work items, then kill it  */
2325         if (fc_host->work_q) {
2326                 work_q = fc_host->work_q;
2327                 fc_host->work_q = NULL;
2328                 destroy_workqueue(work_q);
2329         }
2330
2331         /* flush all devloss work items, then kill it  */
2332         if (fc_host->devloss_work_q) {
2333                 work_q = fc_host->devloss_work_q;
2334                 fc_host->devloss_work_q = NULL;
2335                 destroy_workqueue(work_q);
2336         }
2337 }
2338 EXPORT_SYMBOL(fc_remove_host);
2339
2340 static void fc_terminate_rport_io(struct fc_rport *rport)
2341 {
2342         struct Scsi_Host *shost = rport_to_shost(rport);
2343         struct fc_internal *i = to_fc_internal(shost->transportt);
2344
2345         /* Involve the LLDD if possible to terminate all io on the rport. */
2346         if (i->f->terminate_rport_io)
2347                 i->f->terminate_rport_io(rport);
2348
2349         /*
2350          * must unblock to flush queued IO. The caller will have set
2351          * the port_state or flags, so that fc_remote_port_chkready will
2352          * fail IO.
2353          */
2354         scsi_target_unblock(&rport->dev);
2355 }
2356
2357 /**
2358  * fc_starget_delete - called to delete the scsi decendents of an rport
2359  * @work:       remote port to be operated on.
2360  *
2361  * Deletes target and all sdevs.
2362  */
2363 static void
2364 fc_starget_delete(struct work_struct *work)
2365 {
2366         struct fc_rport *rport =
2367                 container_of(work, struct fc_rport, stgt_delete_work);
2368
2369         fc_terminate_rport_io(rport);
2370         scsi_remove_target(&rport->dev);
2371 }
2372
2373
2374 /**
2375  * fc_rport_final_delete - finish rport termination and delete it.
2376  * @work:       remote port to be deleted.
2377  */
2378 static void
2379 fc_rport_final_delete(struct work_struct *work)
2380 {
2381         struct fc_rport *rport =
2382                 container_of(work, struct fc_rport, rport_delete_work);
2383         struct device *dev = &rport->dev;
2384         struct Scsi_Host *shost = rport_to_shost(rport);
2385         struct fc_internal *i = to_fc_internal(shost->transportt);
2386         unsigned long flags;
2387
2388         /*
2389          * if a scan is pending, flush the SCSI Host work_q so that
2390          * that we can reclaim the rport scan work element.
2391          */
2392         if (rport->flags & FC_RPORT_SCAN_PENDING)
2393                 scsi_flush_work(shost);
2394
2395         fc_terminate_rport_io(rport);
2396
2397         /*
2398          * Cancel any outstanding timers. These should really exist
2399          * only when rmmod'ing the LLDD and we're asking for
2400          * immediate termination of the rports
2401          */
2402         spin_lock_irqsave(shost->host_lock, flags);
2403         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2404                 spin_unlock_irqrestore(shost->host_lock, flags);
2405                 if (!cancel_delayed_work(&rport->fail_io_work))
2406                         fc_flush_devloss(shost);
2407                 if (!cancel_delayed_work(&rport->dev_loss_work))
2408                         fc_flush_devloss(shost);
2409                 spin_lock_irqsave(shost->host_lock, flags);
2410                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2411         }
2412         spin_unlock_irqrestore(shost->host_lock, flags);
2413
2414         /* Delete SCSI target and sdevs */
2415         if (rport->scsi_target_id != -1)
2416                 fc_starget_delete(&rport->stgt_delete_work);
2417
2418         /*
2419          * Notify the driver that the rport is now dead. The LLDD will
2420          * also guarantee that any communication to the rport is terminated
2421          *
2422          * Avoid this call if we already called it when we preserved the
2423          * rport for the binding.
2424          */
2425         if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2426             (i->f->dev_loss_tmo_callbk))
2427                 i->f->dev_loss_tmo_callbk(rport);
2428
2429         fc_bsg_remove(rport->rqst_q);
2430
2431         transport_remove_device(dev);
2432         device_del(dev);
2433         transport_destroy_device(dev);
2434         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2435         put_device(dev);                        /* for self-reference */
2436 }
2437
2438
2439 /**
2440  * fc_rport_create - allocates and creates a remote FC port.
2441  * @shost:      scsi host the remote port is connected to.
2442  * @channel:    Channel on shost port connected to.
2443  * @ids:        The world wide names, fc address, and FC4 port
2444  *              roles for the remote port.
2445  *
2446  * Allocates and creates the remoter port structure, including the
2447  * class and sysfs creation.
2448  *
2449  * Notes:
2450  *      This routine assumes no locks are held on entry.
2451  */
2452 static struct fc_rport *
2453 fc_rport_create(struct Scsi_Host *shost, int channel,
2454         struct fc_rport_identifiers  *ids)
2455 {
2456         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2457         struct fc_internal *fci = to_fc_internal(shost->transportt);
2458         struct fc_rport *rport;
2459         struct device *dev;
2460         unsigned long flags;
2461         int error;
2462         size_t size;
2463
2464         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2465         rport = kzalloc(size, GFP_KERNEL);
2466         if (unlikely(!rport)) {
2467                 printk(KERN_ERR "%s: allocation failure\n", __func__);
2468                 return NULL;
2469         }
2470
2471         rport->maxframe_size = -1;
2472         rport->supported_classes = FC_COS_UNSPECIFIED;
2473         rport->dev_loss_tmo = fc_dev_loss_tmo;
2474         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2475         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2476         rport->port_id = ids->port_id;
2477         rport->roles = ids->roles;
2478         rport->port_state = FC_PORTSTATE_ONLINE;
2479         if (fci->f->dd_fcrport_size)
2480                 rport->dd_data = &rport[1];
2481         rport->channel = channel;
2482         rport->fast_io_fail_tmo = -1;
2483
2484         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2485         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2486         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2487         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2488         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2489
2490         spin_lock_irqsave(shost->host_lock, flags);
2491
2492         rport->number = fc_host->next_rport_number++;
2493         if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2494                 rport->scsi_target_id = fc_host->next_target_id++;
2495         else
2496                 rport->scsi_target_id = -1;
2497         list_add_tail(&rport->peers, &fc_host->rports);
2498         get_device(&shost->shost_gendev);       /* for fc_host->rport list */
2499
2500         spin_unlock_irqrestore(shost->host_lock, flags);
2501
2502         dev = &rport->dev;
2503         device_initialize(dev);                 /* takes self reference */
2504         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2505         dev->release = fc_rport_dev_release;
2506         dev_set_name(dev, "rport-%d:%d-%d",
2507                      shost->host_no, channel, rport->number);
2508         transport_setup_device(dev);
2509
2510         error = device_add(dev);
2511         if (error) {
2512                 printk(KERN_ERR "FC Remote Port device_add failed\n");
2513                 goto delete_rport;
2514         }
2515         transport_add_device(dev);
2516         transport_configure_device(dev);
2517
2518         fc_bsg_rportadd(shost, rport);
2519         /* ignore any bsg add error - we just can't do sgio */
2520
2521         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2522                 /* initiate a scan of the target */
2523                 rport->flags |= FC_RPORT_SCAN_PENDING;
2524                 scsi_queue_work(shost, &rport->scan_work);
2525         }
2526
2527         return rport;
2528
2529 delete_rport:
2530         transport_destroy_device(dev);
2531         spin_lock_irqsave(shost->host_lock, flags);
2532         list_del(&rport->peers);
2533         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2534         spin_unlock_irqrestore(shost->host_lock, flags);
2535         put_device(dev->parent);
2536         kfree(rport);
2537         return NULL;
2538 }
2539
2540 /**
2541  * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2542  * @shost:      scsi host the remote port is connected to.
2543  * @channel:    Channel on shost port connected to.
2544  * @ids:        The world wide names, fc address, and FC4 port
2545  *              roles for the remote port.
2546  *
2547  * The LLDD calls this routine to notify the transport of the existence
2548  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2549  * of the port, it's FC address (port_id), and the FC4 roles that are
2550  * active for the port.
2551  *
2552  * For ports that are FCP targets (aka scsi targets), the FC transport
2553  * maintains consistent target id bindings on behalf of the LLDD.
2554  * A consistent target id binding is an assignment of a target id to
2555  * a remote port identifier, which persists while the scsi host is
2556  * attached. The remote port can disappear, then later reappear, and
2557  * it's target id assignment remains the same. This allows for shifts
2558  * in FC addressing (if binding by wwpn or wwnn) with no apparent
2559  * changes to the scsi subsystem which is based on scsi host number and
2560  * target id values.  Bindings are only valid during the attachment of
2561  * the scsi host. If the host detaches, then later re-attaches, target
2562  * id bindings may change.
2563  *
2564  * This routine is responsible for returning a remote port structure.
2565  * The routine will search the list of remote ports it maintains
2566  * internally on behalf of consistent target id mappings. If found, the
2567  * remote port structure will be reused. Otherwise, a new remote port
2568  * structure will be allocated.
2569  *
2570  * Whenever a remote port is allocated, a new fc_remote_port class
2571  * device is created.
2572  *
2573  * Should not be called from interrupt context.
2574  *
2575  * Notes:
2576  *      This routine assumes no locks are held on entry.
2577  */
2578 struct fc_rport *
2579 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2580         struct fc_rport_identifiers  *ids)
2581 {
2582         struct fc_internal *fci = to_fc_internal(shost->transportt);
2583         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2584         struct fc_rport *rport;
2585         unsigned long flags;
2586         int match = 0;
2587
2588         /* ensure any stgt delete functions are done */
2589         fc_flush_work(shost);
2590
2591         /*
2592          * Search the list of "active" rports, for an rport that has been
2593          * deleted, but we've held off the real delete while the target
2594          * is in a "blocked" state.
2595          */
2596         spin_lock_irqsave(shost->host_lock, flags);
2597
2598         list_for_each_entry(rport, &fc_host->rports, peers) {
2599
2600                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2601                         (rport->channel == channel)) {
2602
2603                         switch (fc_host->tgtid_bind_type) {
2604                         case FC_TGTID_BIND_BY_WWPN:
2605                         case FC_TGTID_BIND_NONE:
2606                                 if (rport->port_name == ids->port_name)
2607                                         match = 1;
2608                                 break;
2609                         case FC_TGTID_BIND_BY_WWNN:
2610                                 if (rport->node_name == ids->node_name)
2611                                         match = 1;
2612                                 break;
2613                         case FC_TGTID_BIND_BY_ID:
2614                                 if (rport->port_id == ids->port_id)
2615                                         match = 1;
2616                                 break;
2617                         }
2618
2619                         if (match) {
2620
2621                                 memcpy(&rport->node_name, &ids->node_name,
2622                                         sizeof(rport->node_name));
2623                                 memcpy(&rport->port_name, &ids->port_name,
2624                                         sizeof(rport->port_name));
2625                                 rport->port_id = ids->port_id;
2626
2627                                 rport->port_state = FC_PORTSTATE_ONLINE;
2628                                 rport->roles = ids->roles;
2629
2630                                 spin_unlock_irqrestore(shost->host_lock, flags);
2631
2632                                 if (fci->f->dd_fcrport_size)
2633                                         memset(rport->dd_data, 0,
2634                                                 fci->f->dd_fcrport_size);
2635
2636                                 /*
2637                                  * If we were not a target, cancel the
2638                                  * io terminate and rport timers, and
2639                                  * we're done.
2640                                  *
2641                                  * If we were a target, but our new role
2642                                  * doesn't indicate a target, leave the
2643                                  * timers running expecting the role to
2644                                  * change as the target fully logs in. If
2645                                  * it doesn't, the target will be torn down.
2646                                  *
2647                                  * If we were a target, and our role shows
2648                                  * we're still a target, cancel the timers
2649                                  * and kick off a scan.
2650                                  */
2651
2652                                 /* was a target, not in roles */
2653                                 if ((rport->scsi_target_id != -1) &&
2654                                     (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2655                                         return rport;
2656
2657                                 /*
2658                                  * Stop the fail io and dev_loss timers.
2659                                  * If they flush, the port_state will
2660                                  * be checked and will NOOP the function.
2661                                  */
2662                                 if (!cancel_delayed_work(&rport->fail_io_work))
2663                                         fc_flush_devloss(shost);
2664                                 if (!cancel_delayed_work(&rport->dev_loss_work))
2665                                         fc_flush_devloss(shost);
2666
2667                                 spin_lock_irqsave(shost->host_lock, flags);
2668
2669                                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2670                                                   FC_RPORT_DEVLOSS_PENDING |
2671                                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
2672
2673                                 /* if target, initiate a scan */
2674                                 if (rport->scsi_target_id != -1) {
2675                                         rport->flags |= FC_RPORT_SCAN_PENDING;
2676                                         scsi_queue_work(shost,
2677                                                         &rport->scan_work);
2678                                         spin_unlock_irqrestore(shost->host_lock,
2679                                                         flags);
2680                                         scsi_target_unblock(&rport->dev);
2681                                 } else
2682                                         spin_unlock_irqrestore(shost->host_lock,
2683                                                         flags);
2684
2685                                 fc_bsg_goose_queue(rport);
2686
2687                                 return rport;
2688                         }
2689                 }
2690         }
2691
2692         /*
2693          * Search the bindings array
2694          * Note: if never a FCP target, you won't be on this list
2695          */
2696         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2697
2698                 /* search for a matching consistent binding */
2699
2700                 list_for_each_entry(rport, &fc_host->rport_bindings,
2701                                         peers) {
2702                         if (rport->channel != channel)
2703                                 continue;
2704
2705                         switch (fc_host->tgtid_bind_type) {
2706                         case FC_TGTID_BIND_BY_WWPN:
2707                                 if (rport->port_name == ids->port_name)
2708                                         match = 1;
2709                                 break;
2710                         case FC_TGTID_BIND_BY_WWNN:
2711                                 if (rport->node_name == ids->node_name)
2712                                         match = 1;
2713                                 break;
2714                         case FC_TGTID_BIND_BY_ID:
2715                                 if (rport->port_id == ids->port_id)
2716                                         match = 1;
2717                                 break;
2718                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2719                                 break;
2720                         }
2721
2722                         if (match) {
2723                                 list_move_tail(&rport->peers, &fc_host->rports);
2724                                 break;
2725                         }
2726                 }
2727
2728                 if (match) {
2729                         memcpy(&rport->node_name, &ids->node_name,
2730                                 sizeof(rport->node_name));
2731                         memcpy(&rport->port_name, &ids->port_name,
2732                                 sizeof(rport->port_name));
2733                         rport->port_id = ids->port_id;
2734                         rport->roles = ids->roles;
2735                         rport->port_state = FC_PORTSTATE_ONLINE;
2736                         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2737
2738                         if (fci->f->dd_fcrport_size)
2739                                 memset(rport->dd_data, 0,
2740                                                 fci->f->dd_fcrport_size);
2741
2742                         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2743                                 /* initiate a scan of the target */
2744                                 rport->flags |= FC_RPORT_SCAN_PENDING;
2745                                 scsi_queue_work(shost, &rport->scan_work);
2746                                 spin_unlock_irqrestore(shost->host_lock, flags);
2747                                 scsi_target_unblock(&rport->dev);
2748                         } else
2749                                 spin_unlock_irqrestore(shost->host_lock, flags);
2750
2751                         return rport;
2752                 }
2753         }
2754
2755         spin_unlock_irqrestore(shost->host_lock, flags);
2756
2757         /* No consistent binding found - create new remote port entry */
2758         rport = fc_rport_create(shost, channel, ids);
2759
2760         return rport;
2761 }
2762 EXPORT_SYMBOL(fc_remote_port_add);
2763
2764
2765 /**
2766  * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2767  * @rport:      The remote port that no longer exists
2768  *
2769  * The LLDD calls this routine to notify the transport that a remote
2770  * port is no longer part of the topology. Note: Although a port
2771  * may no longer be part of the topology, it may persist in the remote
2772  * ports displayed by the fc_host. We do this under 2 conditions:
2773  * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2774  *   This allows the port to temporarily disappear, then reappear without
2775  *   disrupting the SCSI device tree attached to it. During the "blocked"
2776  *   period the port will still exist.
2777  * 2) If the port was a scsi target and disappears for longer than we
2778  *   expect, we'll delete the port and the tear down the SCSI device tree
2779  *   attached to it. However, we want to semi-persist the target id assigned
2780  *   to that port if it eventually does exist. The port structure will
2781  *   remain (although with minimal information) so that the target id
2782  *   bindings remails.
2783  *
2784  * If the remote port is not an FCP Target, it will be fully torn down
2785  * and deallocated, including the fc_remote_port class device.
2786  *
2787  * If the remote port is an FCP Target, the port will be placed in a
2788  * temporary blocked state. From the LLDD's perspective, the rport no
2789  * longer exists. From the SCSI midlayer's perspective, the SCSI target
2790  * exists, but all sdevs on it are blocked from further I/O. The following
2791  * is then expected.
2792  *
2793  *   If the remote port does not return (signaled by a LLDD call to
2794  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2795  *   scsi target is removed - killing all outstanding i/o and removing the
2796  *   scsi devices attached ot it. The port structure will be marked Not
2797  *   Present and be partially cleared, leaving only enough information to
2798  *   recognize the remote port relative to the scsi target id binding if
2799  *   it later appears.  The port will remain as long as there is a valid
2800  *   binding (e.g. until the user changes the binding type or unloads the
2801  *   scsi host with the binding).
2802  *
2803  *   If the remote port returns within the dev_loss_tmo value (and matches
2804  *   according to the target id binding type), the port structure will be
2805  *   reused. If it is no longer a SCSI target, the target will be torn
2806  *   down. If it continues to be a SCSI target, then the target will be
2807  *   unblocked (allowing i/o to be resumed), and a scan will be activated
2808  *   to ensure that all luns are detected.
2809  *
2810  * Called from normal process context only - cannot be called from interrupt.
2811  *
2812  * Notes:
2813  *      This routine assumes no locks are held on entry.
2814  */
2815 void
2816 fc_remote_port_delete(struct fc_rport  *rport)
2817 {
2818         struct Scsi_Host *shost = rport_to_shost(rport);
2819         int timeout = rport->dev_loss_tmo;
2820         unsigned long flags;
2821
2822         /*
2823          * No need to flush the fc_host work_q's, as all adds are synchronous.
2824          *
2825          * We do need to reclaim the rport scan work element, so eventually
2826          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2827          * there's still a scan pending.
2828          */
2829
2830         spin_lock_irqsave(shost->host_lock, flags);
2831
2832         if (rport->port_state != FC_PORTSTATE_ONLINE) {
2833                 spin_unlock_irqrestore(shost->host_lock, flags);
2834                 return;
2835         }
2836
2837         /*
2838          * In the past, we if this was not an FCP-Target, we would
2839          * unconditionally just jump to deleting the rport.
2840          * However, rports can be used as node containers by the LLDD,
2841          * and its not appropriate to just terminate the rport at the
2842          * first sign of a loss in connectivity. The LLDD may want to
2843          * send ELS traffic to re-validate the login. If the rport is
2844          * immediately deleted, it makes it inappropriate for a node
2845          * container.
2846          * So... we now unconditionally wait dev_loss_tmo before
2847          * destroying an rport.
2848          */
2849
2850         rport->port_state = FC_PORTSTATE_BLOCKED;
2851
2852         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2853
2854         spin_unlock_irqrestore(shost->host_lock, flags);
2855
2856         if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2857             shost->active_mode & MODE_TARGET)
2858                 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2859
2860         scsi_target_block(&rport->dev);
2861
2862         /* see if we need to kill io faster than waiting for device loss */
2863         if ((rport->fast_io_fail_tmo != -1) &&
2864             (rport->fast_io_fail_tmo < timeout))
2865                 fc_queue_devloss_work(shost, &rport->fail_io_work,
2866                                         rport->fast_io_fail_tmo * HZ);
2867
2868         /* cap the length the devices can be blocked until they are deleted */
2869         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2870 }
2871 EXPORT_SYMBOL(fc_remote_port_delete);
2872
2873 /**
2874  * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
2875  * @rport:      The remote port that changed.
2876  * @roles:      New roles for this port.
2877  *
2878  * Description: The LLDD calls this routine to notify the transport that the
2879  * roles on a remote port may have changed. The largest effect of this is
2880  * if a port now becomes a FCP Target, it must be allocated a
2881  * scsi target id.  If the port is no longer a FCP target, any
2882  * scsi target id value assigned to it will persist in case the
2883  * role changes back to include FCP Target. No changes in the scsi
2884  * midlayer will be invoked if the role changes (in the expectation
2885  * that the role will be resumed. If it doesn't normal error processing
2886  * will take place).
2887  *
2888  * Should not be called from interrupt context.
2889  *
2890  * Notes:
2891  *      This routine assumes no locks are held on entry.
2892  */
2893 void
2894 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
2895 {
2896         struct Scsi_Host *shost = rport_to_shost(rport);
2897         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2898         unsigned long flags;
2899         int create = 0;
2900         int ret;
2901
2902         spin_lock_irqsave(shost->host_lock, flags);
2903         if (roles & FC_PORT_ROLE_FCP_TARGET) {
2904                 if (rport->scsi_target_id == -1) {
2905                         rport->scsi_target_id = fc_host->next_target_id++;
2906                         create = 1;
2907                 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
2908                         create = 1;
2909         } else if (shost->active_mode & MODE_TARGET) {
2910                 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
2911                                              (char *)&rport->node_name);
2912                 if (ret)
2913                         printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
2914                                ret);
2915         }
2916
2917         rport->roles = roles;
2918
2919         spin_unlock_irqrestore(shost->host_lock, flags);
2920
2921         if (create) {
2922                 /*
2923                  * There may have been a delete timer running on the
2924                  * port. Ensure that it is cancelled as we now know
2925                  * the port is an FCP Target.
2926                  * Note: we know the rport is exists and in an online
2927                  *  state as the LLDD would not have had an rport
2928                  *  reference to pass us.
2929                  *
2930                  * Take no action on the del_timer failure as the state
2931                  * machine state change will validate the
2932                  * transaction.
2933                  */
2934                 if (!cancel_delayed_work(&rport->fail_io_work))
2935                         fc_flush_devloss(shost);
2936                 if (!cancel_delayed_work(&rport->dev_loss_work))
2937                         fc_flush_devloss(shost);
2938
2939                 spin_lock_irqsave(shost->host_lock, flags);
2940                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2941                                   FC_RPORT_DEVLOSS_PENDING);
2942                 spin_unlock_irqrestore(shost->host_lock, flags);
2943
2944                 /* ensure any stgt delete functions are done */
2945                 fc_flush_work(shost);
2946
2947                 /* initiate a scan of the target */
2948                 spin_lock_irqsave(shost->host_lock, flags);
2949                 rport->flags |= FC_RPORT_SCAN_PENDING;
2950                 scsi_queue_work(shost, &rport->scan_work);
2951                 spin_unlock_irqrestore(shost->host_lock, flags);
2952                 scsi_target_unblock(&rport->dev);
2953         }
2954 }
2955 EXPORT_SYMBOL(fc_remote_port_rolechg);
2956
2957 /**
2958  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
2959  * @work:       rport target that failed to reappear in the allotted time.
2960  *
2961  * Description: An attempt to delete a remote port blocks, and if it fails
2962  *              to return in the allotted time this gets called.
2963  */
2964 static void
2965 fc_timeout_deleted_rport(struct work_struct *work)
2966 {
2967         struct fc_rport *rport =
2968                 container_of(work, struct fc_rport, dev_loss_work.work);
2969         struct Scsi_Host *shost = rport_to_shost(rport);
2970         struct fc_internal *i = to_fc_internal(shost->transportt);
2971         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2972         unsigned long flags;
2973
2974         spin_lock_irqsave(shost->host_lock, flags);
2975
2976         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2977
2978         /*
2979          * If the port is ONLINE, then it came back. If it was a SCSI
2980          * target, validate it still is. If not, tear down the
2981          * scsi_target on it.
2982          */
2983         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
2984             (rport->scsi_target_id != -1) &&
2985             !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
2986                 dev_printk(KERN_ERR, &rport->dev,
2987                         "blocked FC remote port time out: no longer"
2988                         " a FCP target, removing starget\n");
2989                 spin_unlock_irqrestore(shost->host_lock, flags);
2990                 scsi_target_unblock(&rport->dev);
2991                 fc_queue_work(shost, &rport->stgt_delete_work);
2992                 return;
2993         }
2994
2995         /* NOOP state - we're flushing workq's */
2996         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
2997                 spin_unlock_irqrestore(shost->host_lock, flags);
2998                 dev_printk(KERN_ERR, &rport->dev,
2999                         "blocked FC remote port time out: leaving"
3000                         " rport%s alone\n",
3001                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3002                 return;
3003         }
3004
3005         if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3006             (rport->scsi_target_id == -1)) {
3007                 list_del(&rport->peers);
3008                 rport->port_state = FC_PORTSTATE_DELETED;
3009                 dev_printk(KERN_ERR, &rport->dev,
3010                         "blocked FC remote port time out: removing"
3011                         " rport%s\n",
3012                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3013                 fc_queue_work(shost, &rport->rport_delete_work);
3014                 spin_unlock_irqrestore(shost->host_lock, flags);
3015                 return;
3016         }
3017
3018         dev_printk(KERN_ERR, &rport->dev,
3019                 "blocked FC remote port time out: removing target and "
3020                 "saving binding\n");
3021
3022         list_move_tail(&rport->peers, &fc_host->rport_bindings);
3023
3024         /*
3025          * Note: We do not remove or clear the hostdata area. This allows
3026          *   host-specific target data to persist along with the
3027          *   scsi_target_id. It's up to the host to manage it's hostdata area.
3028          */
3029
3030         /*
3031          * Reinitialize port attributes that may change if the port comes back.
3032          */
3033         rport->maxframe_size = -1;
3034         rport->supported_classes = FC_COS_UNSPECIFIED;
3035         rport->roles = FC_PORT_ROLE_UNKNOWN;
3036         rport->port_state = FC_PORTSTATE_NOTPRESENT;
3037         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3038         rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3039
3040         /*
3041          * Pre-emptively kill I/O rather than waiting for the work queue
3042          * item to teardown the starget. (FCOE libFC folks prefer this
3043          * and to have the rport_port_id still set when it's done).
3044          */
3045         spin_unlock_irqrestore(shost->host_lock, flags);
3046         fc_terminate_rport_io(rport);
3047
3048         BUG_ON(rport->port_state != FC_PORTSTATE_NOTPRESENT);
3049
3050         /* remove the identifiers that aren't used in the consisting binding */
3051         switch (fc_host->tgtid_bind_type) {
3052         case FC_TGTID_BIND_BY_WWPN:
3053                 rport->node_name = -1;
3054                 rport->port_id = -1;
3055                 break;
3056         case FC_TGTID_BIND_BY_WWNN:
3057                 rport->port_name = -1;
3058                 rport->port_id = -1;
3059                 break;
3060         case FC_TGTID_BIND_BY_ID:
3061                 rport->node_name = -1;
3062                 rport->port_name = -1;
3063                 break;
3064         case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
3065                 break;
3066         }
3067
3068         /*
3069          * As this only occurs if the remote port (scsi target)
3070          * went away and didn't come back - we'll remove
3071          * all attached scsi devices.
3072          */
3073         fc_queue_work(shost, &rport->stgt_delete_work);
3074
3075         /*
3076          * Notify the driver that the rport is now dead. The LLDD will
3077          * also guarantee that any communication to the rport is terminated
3078          *
3079          * Note: we set the CALLBK_DONE flag above to correspond
3080          */
3081         if (i->f->dev_loss_tmo_callbk)
3082                 i->f->dev_loss_tmo_callbk(rport);
3083 }
3084
3085
3086 /**
3087  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3088  * @work:       rport to terminate io on.
3089  *
3090  * Notes: Only requests the failure of the io, not that all are flushed
3091  *    prior to returning.
3092  */
3093 static void
3094 fc_timeout_fail_rport_io(struct work_struct *work)
3095 {
3096         struct fc_rport *rport =
3097                 container_of(work, struct fc_rport, fail_io_work.work);
3098
3099         if (rport->port_state != FC_PORTSTATE_BLOCKED)
3100                 return;
3101
3102         rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3103         fc_terminate_rport_io(rport);
3104 }
3105
3106 /**
3107  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3108  * @work:       remote port to be scanned.
3109  */
3110 static void
3111 fc_scsi_scan_rport(struct work_struct *work)
3112 {
3113         struct fc_rport *rport =
3114                 container_of(work, struct fc_rport, scan_work);
3115         struct Scsi_Host *shost = rport_to_shost(rport);
3116         struct fc_internal *i = to_fc_internal(shost->transportt);
3117         unsigned long flags;
3118
3119         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3120             (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3121             !(i->f->disable_target_scan)) {
3122                 scsi_scan_target(&rport->dev, rport->channel,
3123                         rport->scsi_target_id, SCAN_WILD_CARD, 1);
3124         }
3125
3126         spin_lock_irqsave(shost->host_lock, flags);
3127         rport->flags &= ~FC_RPORT_SCAN_PENDING;
3128         spin_unlock_irqrestore(shost->host_lock, flags);
3129 }
3130
3131
3132 /**
3133  * fc_vport_setup - allocates and creates a FC virtual port.
3134  * @shost:      scsi host the virtual port is connected to.
3135  * @channel:    Channel on shost port connected to.
3136  * @pdev:       parent device for vport
3137  * @ids:        The world wide names, FC4 port roles, etc for
3138  *              the virtual port.
3139  * @ret_vport:  The pointer to the created vport.
3140  *
3141  * Allocates and creates the vport structure, calls the parent host
3142  * to instantiate the vport, the completes w/ class and sysfs creation.
3143  *
3144  * Notes:
3145  *      This routine assumes no locks are held on entry.
3146  */
3147 static int
3148 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3149         struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
3150 {
3151         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3152         struct fc_internal *fci = to_fc_internal(shost->transportt);
3153         struct fc_vport *vport;
3154         struct device *dev;
3155         unsigned long flags;
3156         size_t size;
3157         int error;
3158
3159         *ret_vport = NULL;
3160
3161         if ( ! fci->f->vport_create)
3162                 return -ENOENT;
3163
3164         size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3165         vport = kzalloc(size, GFP_KERNEL);
3166         if (unlikely(!vport)) {
3167                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3168                 return -ENOMEM;
3169         }
3170
3171         vport->vport_state = FC_VPORT_UNKNOWN;
3172         vport->vport_last_state = FC_VPORT_UNKNOWN;
3173         vport->node_name = ids->node_name;
3174         vport->port_name = ids->port_name;
3175         vport->roles = ids->roles;
3176         vport->vport_type = ids->vport_type;
3177         if (fci->f->dd_fcvport_size)
3178                 vport->dd_data = &vport[1];
3179         vport->shost = shost;
3180         vport->channel = channel;
3181         vport->flags = FC_VPORT_CREATING;
3182         INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3183
3184         spin_lock_irqsave(shost->host_lock, flags);
3185
3186         if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3187                 spin_unlock_irqrestore(shost->host_lock, flags);
3188                 kfree(vport);
3189                 return -ENOSPC;
3190         }
3191         fc_host->npiv_vports_inuse++;
3192         vport->number = fc_host->next_vport_number++;
3193         list_add_tail(&vport->peers, &fc_host->vports);
3194         get_device(&shost->shost_gendev);       /* for fc_host->vport list */
3195
3196         spin_unlock_irqrestore(shost->host_lock, flags);
3197
3198         dev = &vport->dev;
3199         device_initialize(dev);                 /* takes self reference */
3200         dev->parent = get_device(pdev);         /* takes parent reference */
3201         dev->release = fc_vport_dev_release;
3202         dev_set_name(dev, "vport-%d:%d-%d",
3203                      shost->host_no, channel, vport->number);
3204         transport_setup_device(dev);
3205
3206         error = device_add(dev);
3207         if (error) {
3208                 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3209                 goto delete_vport;
3210         }
3211         transport_add_device(dev);
3212         transport_configure_device(dev);
3213
3214         error = fci->f->vport_create(vport, ids->disable);
3215         if (error) {
3216                 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3217                 goto delete_vport_all;
3218         }
3219
3220         /*
3221          * if the parent isn't the physical adapter's Scsi_Host, ensure
3222          * the Scsi_Host at least contains ia symlink to the vport.
3223          */
3224         if (pdev != &shost->shost_gendev) {
3225                 error = sysfs_create_link(&shost->shost_gendev.kobj,
3226                                  &dev->kobj, dev_name(dev));
3227                 if (error)
3228                         printk(KERN_ERR
3229                                 "%s: Cannot create vport symlinks for "
3230                                 "%s, err=%d\n",
3231                                 __func__, dev_name(dev), error);
3232         }
3233         spin_lock_irqsave(shost->host_lock, flags);
3234         vport->flags &= ~FC_VPORT_CREATING;
3235         spin_unlock_irqrestore(shost->host_lock, flags);
3236
3237         dev_printk(KERN_NOTICE, pdev,
3238                         "%s created via shost%d channel %d\n", dev_name(dev),
3239                         shost->host_no, channel);
3240
3241         *ret_vport = vport;
3242
3243         return 0;
3244
3245 delete_vport_all:
3246         transport_remove_device(dev);
3247         device_del(dev);
3248 delete_vport:
3249         transport_destroy_device(dev);
3250         spin_lock_irqsave(shost->host_lock, flags);
3251         list_del(&vport->peers);
3252         put_device(&shost->shost_gendev);       /* for fc_host->vport list */
3253         fc_host->npiv_vports_inuse--;
3254         spin_unlock_irqrestore(shost->host_lock, flags);
3255         put_device(dev->parent);
3256         kfree(vport);
3257
3258         return error;
3259 }
3260
3261 /**
3262  * fc_vport_create - Admin App or LLDD requests creation of a vport
3263  * @shost:      scsi host the virtual port is connected to.
3264  * @channel:    channel on shost port connected to.
3265  * @ids:        The world wide names, FC4 port roles, etc for
3266  *              the virtual port.
3267  *
3268  * Notes:
3269  *      This routine assumes no locks are held on entry.
3270  */
3271 struct fc_vport *
3272 fc_vport_create(struct Scsi_Host *shost, int channel,
3273         struct fc_vport_identifiers *ids)
3274 {
3275         int stat;
3276         struct fc_vport *vport;
3277
3278         stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3279                  ids, &vport);
3280         return stat ? NULL : vport;
3281 }
3282 EXPORT_SYMBOL(fc_vport_create);
3283
3284 /**
3285  * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3286  * @vport:      fc_vport to be terminated
3287  *
3288  * Calls the LLDD vport_delete() function, then deallocates and removes
3289  * the vport from the shost and object tree.
3290  *
3291  * Notes:
3292  *      This routine assumes no locks are held on entry.
3293  */
3294 int
3295 fc_vport_terminate(struct fc_vport *vport)
3296 {
3297         struct Scsi_Host *shost = vport_to_shost(vport);
3298         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3299         struct fc_internal *i = to_fc_internal(shost->transportt);
3300         struct device *dev = &vport->dev;
3301         unsigned long flags;
3302         int stat;
3303
3304         spin_lock_irqsave(shost->host_lock, flags);
3305         if (vport->flags & FC_VPORT_CREATING) {
3306                 spin_unlock_irqrestore(shost->host_lock, flags);
3307                 return -EBUSY;
3308         }
3309         if (vport->flags & (FC_VPORT_DEL)) {
3310                 spin_unlock_irqrestore(shost->host_lock, flags);
3311                 return -EALREADY;
3312         }
3313         vport->flags |= FC_VPORT_DELETING;
3314         spin_unlock_irqrestore(shost->host_lock, flags);
3315
3316         if (i->f->vport_delete)
3317                 stat = i->f->vport_delete(vport);
3318         else
3319                 stat = -ENOENT;
3320
3321         spin_lock_irqsave(shost->host_lock, flags);
3322         vport->flags &= ~FC_VPORT_DELETING;
3323         if (!stat) {
3324                 vport->flags |= FC_VPORT_DELETED;
3325                 list_del(&vport->peers);
3326                 fc_host->npiv_vports_inuse--;
3327                 put_device(&shost->shost_gendev);  /* for fc_host->vport list */
3328         }
3329         spin_unlock_irqrestore(shost->host_lock, flags);
3330
3331         if (stat)
3332                 return stat;
3333
3334         if (dev->parent != &shost->shost_gendev)
3335                 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3336         transport_remove_device(dev);
3337         device_del(dev);
3338         transport_destroy_device(dev);
3339
3340         /*
3341          * Removing our self-reference should mean our
3342          * release function gets called, which will drop the remaining
3343          * parent reference and free the data structure.
3344          */
3345         put_device(dev);                        /* for self-reference */
3346
3347         return 0; /* SUCCESS */
3348 }
3349 EXPORT_SYMBOL(fc_vport_terminate);
3350
3351 /**
3352  * fc_vport_sched_delete - workq-based delete request for a vport
3353  * @work:       vport to be deleted.
3354  */
3355 static void
3356 fc_vport_sched_delete(struct work_struct *work)
3357 {
3358         struct fc_vport *vport =
3359                 container_of(work, struct fc_vport, vport_delete_work);
3360         int stat;
3361
3362         stat = fc_vport_terminate(vport);
3363         if (stat)
3364                 dev_printk(KERN_ERR, vport->dev.parent,
3365                         "%s: %s could not be deleted created via "
3366                         "shost%d channel %d - error %d\n", __func__,
3367                         dev_name(&vport->dev), vport->shost->host_no,
3368                         vport->channel, stat);
3369 }
3370
3371
3372 /*
3373  * BSG support
3374  */
3375
3376
3377 /**
3378  * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3379  * @job:        fc_bsg_job that is to be torn down
3380  */
3381 static void
3382 fc_destroy_bsgjob(struct fc_bsg_job *job)
3383 {
3384         unsigned long flags;
3385
3386         spin_lock_irqsave(&job->job_lock, flags);
3387         if (job->ref_cnt) {
3388                 spin_unlock_irqrestore(&job->job_lock, flags);
3389                 return;
3390         }
3391         spin_unlock_irqrestore(&job->job_lock, flags);
3392
3393         put_device(job->dev);   /* release reference for the request */
3394
3395         kfree(job->request_payload.sg_list);
3396         kfree(job->reply_payload.sg_list);
3397         kfree(job);
3398 }
3399
3400 /**
3401  * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3402  *                  completed
3403  * @job:        fc_bsg_job that is complete
3404  */
3405 static void
3406 fc_bsg_jobdone(struct fc_bsg_job *job)
3407 {
3408         struct request *req = job->req;
3409         struct request *rsp = req->next_rq;
3410         int err;
3411
3412         err = job->req->errors = job->reply->result;
3413
3414         if (err < 0)
3415                 /* we're only returning the result field in the reply */
3416                 job->req->sense_len = sizeof(uint32_t);
3417         else
3418                 job->req->sense_len = job->reply_len;
3419
3420         /* we assume all request payload was transferred, residual == 0 */
3421         req->resid_len = 0;
3422
3423         if (rsp) {
3424                 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3425
3426                 /* set reply (bidi) residual */
3427                 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3428                                       rsp->resid_len);
3429         }
3430         blk_complete_request(req);
3431 }
3432
3433 /**
3434  * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3435  * @req:        BSG request that holds the job to be destroyed
3436  */
3437 static void fc_bsg_softirq_done(struct request *rq)
3438 {
3439         struct fc_bsg_job *job = rq->special;
3440         unsigned long flags;
3441
3442         spin_lock_irqsave(&job->job_lock, flags);
3443         job->state_flags |= FC_RQST_STATE_DONE;
3444         job->ref_cnt--;
3445         spin_unlock_irqrestore(&job->job_lock, flags);
3446
3447         blk_end_request_all(rq, rq->errors);
3448         fc_destroy_bsgjob(job);
3449 }
3450
3451 /**
3452  * fc_bsg_job_timeout - handler for when a bsg request timesout
3453  * @req:        request that timed out
3454  */
3455 static enum blk_eh_timer_return
3456 fc_bsg_job_timeout(struct request *req)
3457 {
3458         struct fc_bsg_job *job = (void *) req->special;
3459         struct Scsi_Host *shost = job->shost;
3460         struct fc_internal *i = to_fc_internal(shost->transportt);
3461         unsigned long flags;
3462         int err = 0, done = 0;
3463
3464         if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3465                 return BLK_EH_RESET_TIMER;
3466
3467         spin_lock_irqsave(&job->job_lock, flags);
3468         if (job->state_flags & FC_RQST_STATE_DONE)
3469                 done = 1;
3470         else
3471                 job->ref_cnt++;
3472         spin_unlock_irqrestore(&job->job_lock, flags);
3473
3474         if (!done && i->f->bsg_timeout) {
3475                 /* call LLDD to abort the i/o as it has timed out */
3476                 err = i->f->bsg_timeout(job);
3477                 if (err)
3478                         printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3479                                 "abort failed with status %d\n", err);
3480         }
3481
3482         /* the blk_end_sync_io() doesn't check the error */
3483         if (done)
3484                 return BLK_EH_NOT_HANDLED;
3485         else
3486                 return BLK_EH_HANDLED;
3487 }
3488
3489 static int
3490 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3491 {
3492         size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3493
3494         BUG_ON(!req->nr_phys_segments);
3495
3496         buf->sg_list = kzalloc(sz, GFP_KERNEL);
3497         if (!buf->sg_list)
3498                 return -ENOMEM;
3499         sg_init_table(buf->sg_list, req->nr_phys_segments);
3500         buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3501         buf->payload_len = blk_rq_bytes(req);
3502         return 0;
3503 }
3504
3505
3506 /**
3507  * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3508  *                   bsg request
3509  * @shost:      SCSI Host corresponding to the bsg object
3510  * @rport:      (optional) FC Remote Port corresponding to the bsg object
3511  * @req:        BSG request that needs a job structure
3512  */
3513 static int
3514 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3515         struct request *req)
3516 {
3517         struct fc_internal *i = to_fc_internal(shost->transportt);
3518         struct request *rsp = req->next_rq;
3519         struct fc_bsg_job *job;
3520         int ret;
3521
3522         BUG_ON(req->special);
3523
3524         job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3525                         GFP_KERNEL);
3526         if (!job)
3527                 return -ENOMEM;
3528
3529         /*
3530          * Note: this is a bit silly.
3531          * The request gets formatted as a SGIO v4 ioctl request, which
3532          * then gets reformatted as a blk request, which then gets
3533          * reformatted as a fc bsg request. And on completion, we have
3534          * to wrap return results such that SGIO v4 thinks it was a scsi
3535          * status.  I hope this was all worth it.
3536          */
3537
3538         req->special = job;
3539         job->shost = shost;
3540         job->rport = rport;
3541         job->req = req;
3542         if (i->f->dd_bsg_size)
3543                 job->dd_data = (void *)&job[1];
3544         spin_lock_init(&job->job_lock);
3545         job->request = (struct fc_bsg_request *)req->cmd;
3546         job->request_len = req->cmd_len;
3547         job->reply = req->sense;
3548         job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3549                                                  * allocated */
3550         if (req->bio) {
3551                 ret = fc_bsg_map_buffer(&job->request_payload, req);
3552                 if (ret)
3553                         goto failjob_rls_job;
3554         }
3555         if (rsp && rsp->bio) {
3556                 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3557                 if (ret)
3558                         goto failjob_rls_rqst_payload;
3559         }
3560         job->job_done = fc_bsg_jobdone;
3561         if (rport)
3562                 job->dev = &rport->dev;
3563         else
3564                 job->dev = &shost->shost_gendev;
3565         get_device(job->dev);           /* take a reference for the request */
3566
3567         job->ref_cnt = 1;
3568
3569         return 0;
3570
3571
3572 failjob_rls_rqst_payload:
3573         kfree(job->request_payload.sg_list);
3574 failjob_rls_job:
3575         kfree(job);
3576         return -ENOMEM;
3577 }
3578
3579
3580 enum fc_dispatch_result {
3581         FC_DISPATCH_BREAK,      /* on return, q is locked, break from q loop */
3582         FC_DISPATCH_LOCKED,     /* on return, q is locked, continue on */
3583         FC_DISPATCH_UNLOCKED,   /* on return, q is unlocked, continue on */
3584 };
3585
3586
3587 /**
3588  * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3589  * @shost:      scsi host rport attached to
3590  * @job:        bsg job to be processed
3591  */
3592 static enum fc_dispatch_result
3593 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3594                          struct fc_bsg_job *job)
3595 {
3596         struct fc_internal *i = to_fc_internal(shost->transportt);
3597         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3598         int ret;
3599
3600         /* Validate the host command */
3601         switch (job->request->msgcode) {
3602         case FC_BSG_HST_ADD_RPORT:
3603                 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3604                 break;
3605
3606         case FC_BSG_HST_DEL_RPORT:
3607                 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3608                 break;
3609
3610         case FC_BSG_HST_ELS_NOLOGIN:
3611                 cmdlen += sizeof(struct fc_bsg_host_els);
3612                 /* there better be a xmt and rcv payloads */
3613                 if ((!job->request_payload.payload_len) ||
3614                     (!job->reply_payload.payload_len)) {
3615                         ret = -EINVAL;
3616                         goto fail_host_msg;
3617                 }
3618                 break;
3619
3620         case FC_BSG_HST_CT:
3621                 cmdlen += sizeof(struct fc_bsg_host_ct);
3622                 /* there better be xmt and rcv payloads */
3623                 if ((!job->request_payload.payload_len) ||
3624                     (!job->reply_payload.payload_len)) {
3625                         ret = -EINVAL;
3626                         goto fail_host_msg;
3627                 }
3628                 break;
3629
3630         case FC_BSG_HST_VENDOR:
3631                 cmdlen += sizeof(struct fc_bsg_host_vendor);
3632                 if ((shost->hostt->vendor_id == 0L) ||
3633                     (job->request->rqst_data.h_vendor.vendor_id !=
3634                         shost->hostt->vendor_id)) {
3635                         ret = -ESRCH;
3636                         goto fail_host_msg;
3637                 }
3638                 break;
3639
3640         default:
3641                 ret = -EBADR;
3642                 goto fail_host_msg;
3643         }
3644
3645         /* check if we really have all the request data needed */
3646         if (job->request_len < cmdlen) {
3647                 ret = -ENOMSG;
3648                 goto fail_host_msg;
3649         }
3650
3651         ret = i->f->bsg_request(job);
3652         if (!ret)
3653                 return FC_DISPATCH_UNLOCKED;
3654
3655 fail_host_msg:
3656         /* return the errno failure code as the only status */
3657         BUG_ON(job->reply_len < sizeof(uint32_t));
3658         job->reply->result = ret;
3659         job->reply_len = sizeof(uint32_t);
3660         fc_bsg_jobdone(job);
3661         return FC_DISPATCH_UNLOCKED;
3662 }
3663
3664
3665 /*
3666  * fc_bsg_goose_queue - restart rport queue in case it was stopped
3667  * @rport:      rport to be restarted
3668  */
3669 static void
3670 fc_bsg_goose_queue(struct fc_rport *rport)
3671 {
3672         int flagset;
3673         unsigned long flags;
3674
3675         if (!rport->rqst_q)
3676                 return;
3677
3678         get_device(&rport->dev);
3679
3680         spin_lock_irqsave(rport->rqst_q->queue_lock, flags);
3681         flagset = test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags) &&
3682                   !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags);
3683         if (flagset)
3684                 queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q);
3685         __blk_run_queue(rport->rqst_q);
3686         if (flagset)
3687                 queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q);
3688         spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags);
3689
3690         put_device(&rport->dev);
3691 }
3692
3693
3694 /**
3695  * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3696  * @shost:      scsi host rport attached to
3697  * @rport:      rport request destined to
3698  * @job:        bsg job to be processed
3699  */
3700 static enum fc_dispatch_result
3701 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3702                          struct fc_rport *rport, struct fc_bsg_job *job)
3703 {
3704         struct fc_internal *i = to_fc_internal(shost->transportt);
3705         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3706         int ret;
3707
3708         /* Validate the rport command */
3709         switch (job->request->msgcode) {
3710         case FC_BSG_RPT_ELS:
3711                 cmdlen += sizeof(struct fc_bsg_rport_els);
3712                 goto check_bidi;
3713
3714         case FC_BSG_RPT_CT:
3715                 cmdlen += sizeof(struct fc_bsg_rport_ct);
3716 check_bidi:
3717                 /* there better be xmt and rcv payloads */
3718                 if ((!job->request_payload.payload_len) ||
3719                     (!job->reply_payload.payload_len)) {
3720                         ret = -EINVAL;
3721                         goto fail_rport_msg;
3722                 }
3723                 break;
3724         default:
3725                 ret = -EBADR;
3726                 goto fail_rport_msg;
3727         }
3728
3729         /* check if we really have all the request data needed */
3730         if (job->request_len < cmdlen) {
3731                 ret = -ENOMSG;
3732                 goto fail_rport_msg;
3733         }
3734
3735         ret = i->f->bsg_request(job);
3736         if (!ret)
3737                 return FC_DISPATCH_UNLOCKED;
3738
3739 fail_rport_msg:
3740         /* return the errno failure code as the only status */
3741         BUG_ON(job->reply_len < sizeof(uint32_t));
3742         job->reply->result = ret;
3743         job->reply_len = sizeof(uint32_t);
3744         fc_bsg_jobdone(job);
3745         return FC_DISPATCH_UNLOCKED;
3746 }
3747
3748
3749 /**
3750  * fc_bsg_request_handler - generic handler for bsg requests
3751  * @q:          request queue to manage
3752  * @shost:      Scsi_Host related to the bsg object
3753  * @rport:      FC remote port related to the bsg object (optional)
3754  * @dev:        device structure for bsg object
3755  */
3756 static void
3757 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3758                        struct fc_rport *rport, struct device *dev)
3759 {
3760         struct request *req;
3761         struct fc_bsg_job *job;
3762         enum fc_dispatch_result ret;
3763
3764         if (!get_device(dev))
3765                 return;
3766
3767         while (!blk_queue_plugged(q)) {
3768                 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED))
3769                                 break;
3770
3771                 req = blk_fetch_request(q);
3772                 if (!req)
3773                         break;
3774
3775                 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3776                         req->errors = -ENXIO;
3777                         spin_unlock_irq(q->queue_lock);
3778                         blk_end_request(req, -ENXIO, blk_rq_bytes(req));
3779                         spin_lock_irq(q->queue_lock);
3780                         continue;
3781                 }
3782
3783                 spin_unlock_irq(q->queue_lock);
3784
3785                 ret = fc_req_to_bsgjob(shost, rport, req);
3786                 if (ret) {
3787                         req->errors = ret;
3788                         blk_end_request(req, ret, blk_rq_bytes(req));
3789                         spin_lock_irq(q->queue_lock);
3790                         continue;
3791                 }
3792
3793                 job = req->special;
3794
3795                 /* check if we have the msgcode value at least */
3796                 if (job->request_len < sizeof(uint32_t)) {
3797                         BUG_ON(job->reply_len < sizeof(uint32_t));
3798                         job->reply->result = -ENOMSG;
3799                         job->reply_len = sizeof(uint32_t);
3800                         fc_bsg_jobdone(job);
3801                         spin_lock_irq(q->queue_lock);
3802                         continue;
3803                 }
3804
3805                 /* the dispatch routines will unlock the queue_lock */
3806                 if (rport)
3807                         ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3808                 else
3809                         ret = fc_bsg_host_dispatch(q, shost, job);
3810
3811                 /* did dispatcher hit state that can't process any more */
3812                 if (ret == FC_DISPATCH_BREAK)
3813                         break;
3814
3815                 /* did dispatcher had released the lock */
3816                 if (ret == FC_DISPATCH_UNLOCKED)
3817                         spin_lock_irq(q->queue_lock);
3818         }
3819
3820         spin_unlock_irq(q->queue_lock);
3821         put_device(dev);
3822         spin_lock_irq(q->queue_lock);
3823 }
3824
3825
3826 /**
3827  * fc_bsg_host_handler - handler for bsg requests for a fc host
3828  * @q:          fc host request queue
3829  */
3830 static void
3831 fc_bsg_host_handler(struct request_queue *q)
3832 {
3833         struct Scsi_Host *shost = q->queuedata;
3834
3835         fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
3836 }
3837
3838
3839 /**
3840  * fc_bsg_rport_handler - handler for bsg requests for a fc rport
3841  * @q:          rport request queue
3842  */
3843 static void
3844 fc_bsg_rport_handler(struct request_queue *q)
3845 {
3846         struct fc_rport *rport = q->queuedata;
3847         struct Scsi_Host *shost = rport_to_shost(rport);
3848
3849         fc_bsg_request_handler(q, shost, rport, &rport->dev);
3850 }
3851
3852
3853 /**
3854  * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
3855  * @shost:      shost for fc_host
3856  * @fc_host:    fc_host adding the structures to
3857  */
3858 static int
3859 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
3860 {
3861         struct device *dev = &shost->shost_gendev;
3862         struct fc_internal *i = to_fc_internal(shost->transportt);
3863         struct request_queue *q;
3864         int err;
3865         char bsg_name[20];
3866
3867         fc_host->rqst_q = NULL;
3868
3869         if (!i->f->bsg_request)
3870                 return -ENOTSUPP;
3871
3872         snprintf(bsg_name, sizeof(bsg_name),
3873                  "fc_host%d", shost->host_no);
3874
3875         q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
3876         if (!q) {
3877                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3878                                 "initialize - no request queue\n",
3879                                  shost->host_no);
3880                 return -ENOMEM;
3881         }
3882
3883         q->queuedata = shost;
3884         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3885         blk_queue_softirq_done(q, fc_bsg_softirq_done);
3886         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3887         blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
3888
3889         err = bsg_register_queue(q, dev, bsg_name, NULL);
3890         if (err) {
3891                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3892                                 "initialize - register queue\n",
3893                                 shost->host_no);
3894                 blk_cleanup_queue(q);
3895                 return err;
3896         }
3897
3898         fc_host->rqst_q = q;
3899         return 0;
3900 }
3901
3902
3903 /**
3904  * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
3905  * @shost:      shost that rport is attached to
3906  * @rport:      rport that the bsg hooks are being attached to
3907  */
3908 static int
3909 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
3910 {
3911         struct device *dev = &rport->dev;
3912         struct fc_internal *i = to_fc_internal(shost->transportt);
3913         struct request_queue *q;
3914         int err;
3915
3916         rport->rqst_q = NULL;
3917
3918         if (!i->f->bsg_request)
3919                 return -ENOTSUPP;
3920
3921         q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
3922         if (!q) {
3923                 printk(KERN_ERR "%s: bsg interface failed to "
3924                                 "initialize - no request queue\n",
3925                                  dev->kobj.name);
3926                 return -ENOMEM;
3927         }
3928
3929         q->queuedata = rport;
3930         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3931         blk_queue_softirq_done(q, fc_bsg_softirq_done);
3932         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3933         blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
3934
3935         err = bsg_register_queue(q, dev, NULL, NULL);
3936         if (err) {
3937                 printk(KERN_ERR "%s: bsg interface failed to "
3938                                 "initialize - register queue\n",
3939                                  dev->kobj.name);
3940                 blk_cleanup_queue(q);
3941                 return err;
3942         }
3943
3944         rport->rqst_q = q;
3945         return 0;
3946 }
3947
3948
3949 /**
3950  * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
3951  * @q:  the request_queue that is to be torn down.
3952  */
3953 static void
3954 fc_bsg_remove(struct request_queue *q)
3955 {
3956         if (q) {
3957                 bsg_unregister_queue(q);
3958                 blk_cleanup_queue(q);
3959         }
3960 }
3961
3962
3963 /* Original Author:  Martin Hicks */
3964 MODULE_AUTHOR("James Smart");
3965 MODULE_DESCRIPTION("FC Transport Attributes");
3966 MODULE_LICENSE("GPL");
3967
3968 module_init(fc_transport_init);
3969 module_exit(fc_transport_exit);