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

   1 /*
   2  *  FiberChannel transport specific attributes exported to sysfs.
   3  *
   4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ========
  21  *
  22  *  Copyright (C) 2004-2007   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_priv.h"
  39 #include "scsi_transport_fc_internal.h"
  40
  41 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  42 static void fc_vport_sched_delete(struct work_struct *work);
  43 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
  44         struct device *pdev, struct fc_vport_identifiers  *ids,
  45         struct fc_vport **vport);
  46
  47 /*
  48  * Redefine so that we can have same named attributes in the
  49  * sdev/starget/host objects.
  50  */
  51 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)                \
  52 struct device_attribute device_attr_##_prefix##_##_name =       \
  53         __ATTR(_name,_mode,_show,_store)
  54
  55 #define fc_enum_name_search(title, table_type, table)                   \
  56 static const char *get_fc_##title##_name(enum table_type table_key)     \
  57 {                                                                       \
  58         int i;                                                          \
  59         char *name = NULL;                                              \
  60                                                                         \
  61         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  62                 if (table[i].value == table_key) {                      \
  63                         name = table[i].name;                           \
  64                         break;                                          \
  65                 }                                                       \
  66         }                                                               \
  67         return name;                                                    \
  68 }
  69
  70 #define fc_enum_name_match(title, table_type, table)                    \
  71 static int get_fc_##title##_match(const char *table_key,                \
  72                 enum table_type *value)                                 \
  73 {                                                                       \
  74         int i;                                                          \
  75                                                                         \
  76         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  77                 if (strncmp(table_key, table[i].name,                   \
  78                                 table[i].matchlen) == 0) {              \
  79                         *value = table[i].value;                        \
  80                         return 0; /* success */                         \
  81                 }                                                       \
  82         }                                                               \
  83         return 1; /* failure */                                         \
  84 }
  85
  86
  87 /* Convert fc_port_type values to ascii string name */
  88 static struct {
  89         enum fc_port_type       value;
  90         char                    *name;
  91 } fc_port_type_names[] = {
  92         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
  93         { FC_PORTTYPE_OTHER,            "Other" },
  94         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
  95         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
  96         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
  97         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
  98         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection" },
  99         { FC_PORTTYPE_NPIV,             "NPIV VPORT" },
 100 };
 101 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
 102 #define FC_PORTTYPE_MAX_NAMELEN         50
 103
 104 /* Reuse fc_port_type enum function for vport_type */
 105 #define get_fc_vport_type_name get_fc_port_type_name
 106
 107
 108 /* Convert fc_host_event_code values to ascii string name */
 109 static const struct {
 110         enum fc_host_event_code         value;
 111         char                            *name;
 112 } fc_host_event_code_names[] = {
 113         { FCH_EVT_LIP,                  "lip" },
 114         { FCH_EVT_LINKUP,               "link_up" },
 115         { FCH_EVT_LINKDOWN,             "link_down" },
 116         { FCH_EVT_LIPRESET,             "lip_reset" },
 117         { FCH_EVT_RSCN,                 "rscn" },
 118         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
 119         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
 120         { FCH_EVT_PORT_ONLINE,          "port_online" },
 121         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
 122         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
 123         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
 124         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
 125 };
 126 fc_enum_name_search(host_event_code, fc_host_event_code,
 127                 fc_host_event_code_names)
 128 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
 129
 130
 131 /* Convert fc_port_state values to ascii string name */
 132 static struct {
 133         enum fc_port_state      value;
 134         char                    *name;
 135 } fc_port_state_names[] = {
 136         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
 137         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 138         { FC_PORTSTATE_ONLINE,          "Online" },
 139         { FC_PORTSTATE_OFFLINE,         "Offline" },
 140         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 141         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 142         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 143         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 144         { FC_PORTSTATE_ERROR,           "Error" },
 145         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 146         { FC_PORTSTATE_DELETED,         "Deleted" },
 147 };
 148 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 149 #define FC_PORTSTATE_MAX_NAMELEN        20
 150
 151
 152 /* Convert fc_vport_state values to ascii string name */
 153 static struct {
 154         enum fc_vport_state     value;
 155         char                    *name;
 156 } fc_vport_state_names[] = {
 157         { FC_VPORT_UNKNOWN,             "Unknown" },
 158         { FC_VPORT_ACTIVE,              "Active" },
 159         { FC_VPORT_DISABLED,            "Disabled" },
 160         { FC_VPORT_LINKDOWN,            "Linkdown" },
 161         { FC_VPORT_INITIALIZING,        "Initializing" },
 162         { FC_VPORT_NO_FABRIC_SUPP,      "No Fabric Support" },
 163         { FC_VPORT_NO_FABRIC_RSCS,      "No Fabric Resources" },
 164         { FC_VPORT_FABRIC_LOGOUT,       "Fabric Logout" },
 165         { FC_VPORT_FABRIC_REJ_WWN,      "Fabric Rejected WWN" },
 166         { FC_VPORT_FAILED,              "VPort Failed" },
 167 };
 168 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
 169 #define FC_VPORTSTATE_MAX_NAMELEN       24
 170
 171 /* Reuse fc_vport_state enum function for vport_last_state */
 172 #define get_fc_vport_last_state_name get_fc_vport_state_name
 173
 174
 175 /* Convert fc_tgtid_binding_type values to ascii string name */
 176 static const struct {
 177         enum fc_tgtid_binding_type      value;
 178         char                            *name;
 179         int                             matchlen;
 180 } fc_tgtid_binding_type_names[] = {
 181         { FC_TGTID_BIND_NONE, "none", 4 },
 182         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 183         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 184         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 185 };
 186 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 187                 fc_tgtid_binding_type_names)
 188 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 189                 fc_tgtid_binding_type_names)
 190 #define FC_BINDTYPE_MAX_NAMELEN 30
 191
 192
 193 #define fc_bitfield_name_search(title, table)                   \
 194 static ssize_t                                                  \
 195 get_fc_##title##_names(u32 table_key, char *buf)                \
 196 {                                                               \
 197         char *prefix = "";                                      \
 198         ssize_t len = 0;                                        \
 199         int i;                                                  \
 200                                                                 \
 201         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 202                 if (table[i].value & table_key) {               \
 203                         len += sprintf(buf + len, "%s%s",       \
 204                                 prefix, table[i].name);         \
 205                         prefix = ", ";                          \
 206                 }                                               \
 207         }                                                       \
 208         len += sprintf(buf + len, "\n");                        \
 209         return len;                                             \
 210 }
 211
 212
 213 /* Convert FC_COS bit values to ascii string name */
 214 static const struct {
 215         u32                     value;
 216         char                    *name;
 217 } fc_cos_names[] = {
 218         { FC_COS_CLASS1,        "Class 1" },
 219         { FC_COS_CLASS2,        "Class 2" },
 220         { FC_COS_CLASS3,        "Class 3" },
 221         { FC_COS_CLASS4,        "Class 4" },
 222         { FC_COS_CLASS6,        "Class 6" },
 223 };
 224 fc_bitfield_name_search(cos, fc_cos_names)
 225
 226
 227 /* Convert FC_PORTSPEED bit values to ascii string name */
 228 static const struct {
 229         u32                     value;
 230         char                    *name;
 231 } fc_port_speed_names[] = {
 232         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 233         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 234         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 235         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 236         { FC_PORTSPEED_8GBIT,           "8 Gbit" },
 237         { FC_PORTSPEED_16GBIT,          "16 Gbit" },
 238         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 239 };
 240 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 241
 242
 243 static int
 244 show_fc_fc4s (char *buf, u8 *fc4_list)
 245 {
 246         int i, len=0;
 247
 248         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 249                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 250         len += sprintf(buf + len, "\n");
 251         return len;
 252 }
 253
 254
 255 /* Convert FC_PORT_ROLE bit values to ascii string name */
 256 static const struct {
 257         u32                     value;
 258         char                    *name;
 259 } fc_port_role_names[] = {
 260         { FC_PORT_ROLE_FCP_TARGET,      "FCP Target" },
 261         { FC_PORT_ROLE_FCP_INITIATOR,   "FCP Initiator" },
 262         { FC_PORT_ROLE_IP_PORT,         "IP Port" },
 263 };
 264 fc_bitfield_name_search(port_roles, fc_port_role_names)
 265
 266 /*
 267  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 268  */
 269 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 270 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 271 #define FC_FPORT_PORTID                 0x00000e
 272 #define FC_FABCTLR_PORTID               0x00000d
 273 #define FC_DIRSRVR_PORTID               0x00000c
 274 #define FC_TIMESRVR_PORTID              0x00000b
 275 #define FC_MGMTSRVR_PORTID              0x00000a
 276
 277
 278 static void fc_timeout_deleted_rport(struct work_struct *work);
 279 static void fc_timeout_fail_rport_io(struct work_struct *work);
 280 static void fc_scsi_scan_rport(struct work_struct *work);
 281
 282 /*
 283  * Attribute counts pre object type...
 284  * Increase these values if you add attributes
 285  */
 286 #define FC_STARGET_NUM_ATTRS    3
 287 #define FC_RPORT_NUM_ATTRS      10
 288 #define FC_VPORT_NUM_ATTRS      9
 289 #define FC_HOST_NUM_ATTRS       21
 290
 291 struct fc_internal {
 292         struct scsi_transport_template t;
 293         struct fc_function_template *f;
 294
 295         /*
 296          * For attributes : each object has :
 297          *   An array of the actual attributes structures
 298          *   An array of null-terminated pointers to the attribute
 299          *     structures - used for mid-layer interaction.
 300          *
 301          * The attribute containers for the starget and host are are
 302          * part of the midlayer. As the remote port is specific to the
 303          * fc transport, we must provide the attribute container.
 304          */
 305         struct device_attribute private_starget_attrs[
 306                                                         FC_STARGET_NUM_ATTRS];
 307         struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 308
 309         struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 310         struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 311
 312         struct transport_container rport_attr_cont;
 313         struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 314         struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 315
 316         struct transport_container vport_attr_cont;
 317         struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
 318         struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
 319 };
 320
 321 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 322
 323 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 324                            struct device *cdev)
 325 {
 326         struct scsi_target *starget = to_scsi_target(dev);
 327         struct fc_rport *rport = starget_to_rport(starget);
 328
 329         /*
 330          * if parent is remote port, use values from remote port.
 331          * Otherwise, this host uses the fc_transport, but not the
 332          * remote port interface. As such, initialize to known non-values.
 333          */
 334         if (rport) {
 335                 fc_starget_node_name(starget) = rport->node_name;
 336                 fc_starget_port_name(starget) = rport->port_name;
 337                 fc_starget_port_id(starget) = rport->port_id;
 338         } else {
 339                 fc_starget_node_name(starget) = -1;
 340                 fc_starget_port_name(starget) = -1;
 341                 fc_starget_port_id(starget) = -1;
 342         }
 343
 344         return 0;
 345 }
 346
 347 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 348                                "fc_transport",
 349                                fc_target_setup,
 350                                NULL,
 351                                NULL);
 352
 353 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 354                          struct device *cdev)
 355 {
 356         struct Scsi_Host *shost = dev_to_shost(dev);
 357         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 358
 359         /*
 360          * Set default values easily detected by the midlayer as
 361          * failure cases.  The scsi lldd is responsible for initializing
 362          * all transport attributes to valid values per host.
 363          */
 364         fc_host->node_name = -1;
 365         fc_host->port_name = -1;
 366         fc_host->permanent_port_name = -1;
 367         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 368         memset(fc_host->supported_fc4s, 0,
 369                 sizeof(fc_host->supported_fc4s));
 370         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 371         fc_host->maxframe_size = -1;
 372         fc_host->max_npiv_vports = 0;
 373         memset(fc_host->serial_number, 0,
 374                 sizeof(fc_host->serial_number));
 375
 376         fc_host->port_id = -1;
 377         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 378         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 379         memset(fc_host->active_fc4s, 0,
 380                 sizeof(fc_host->active_fc4s));
 381         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 382         fc_host->fabric_name = -1;
 383         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 384         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
 385
 386         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 387
 388         INIT_LIST_HEAD(&fc_host->rports);
 389         INIT_LIST_HEAD(&fc_host->rport_bindings);
 390         INIT_LIST_HEAD(&fc_host->vports);
 391         fc_host->next_rport_number = 0;
 392         fc_host->next_target_id = 0;
 393         fc_host->next_vport_number = 0;
 394         fc_host->npiv_vports_inuse = 0;
 395
 396         snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
 397                  "fc_wq_%d", shost->host_no);
 398         fc_host->work_q = create_singlethread_workqueue(
 399                                         fc_host->work_q_name);
 400         if (!fc_host->work_q)
 401                 return -ENOMEM;
 402
 403         snprintf(fc_host->devloss_work_q_name,
 404                  sizeof(fc_host->devloss_work_q_name),
 405                  "fc_dl_%d", shost->host_no);
 406         fc_host->devloss_work_q = create_singlethread_workqueue(
 407                                         fc_host->devloss_work_q_name);
 408         if (!fc_host->devloss_work_q) {
 409                 destroy_workqueue(fc_host->work_q);
 410                 fc_host->work_q = NULL;
 411                 return -ENOMEM;
 412         }
 413
 414         return 0;
 415 }
 416
 417 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 418                                "fc_host",
 419                                fc_host_setup,
 420                                NULL,
 421                                NULL);
 422
 423 /*
 424  * Setup and Remove actions for remote ports are handled
 425  * in the service functions below.
 426  */
 427 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 428                                "fc_remote_ports",
 429                                NULL,
 430                                NULL,
 431                                NULL);
 432
 433 /*
 434  * Setup and Remove actions for virtual ports are handled
 435  * in the service functions below.
 436  */
 437 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
 438                                "fc_vports",
 439                                NULL,
 440                                NULL,
 441                                NULL);
 442
 443 /*
 444  * Module Parameters
 445  */
 446
 447 /*
 448  * dev_loss_tmo: the default number of seconds that the FC transport
 449  *   should insulate the loss of a remote port.
 450  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 451  */
 452 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
 453
 454 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
 455 MODULE_PARM_DESC(dev_loss_tmo,
 456                  "Maximum number of seconds that the FC transport should"
 457                  " insulate the loss of a remote port. Once this value is"
 458                  " exceeded, the scsi target is removed. Value should be"
 459                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
 460
 461 /*
 462  * Netlink Infrastructure
 463  */
 464
 465 static atomic_t fc_event_seq;
 466
 467 /**
 468  * fc_get_event_number - Obtain the next sequential FC event number
 469  *
 470  * Notes:
 471  *   We could have inlined this, but it would have required fc_event_seq to
 472  *   be exposed. For now, live with the subroutine call.
 473  *   Atomic used to avoid lock/unlock...
 474  */
 475 u32
 476 fc_get_event_number(void)
 477 {
 478         return atomic_add_return(1, &fc_event_seq);
 479 }
 480 EXPORT_SYMBOL(fc_get_event_number);
 481
 482
 483 /**
 484  * fc_host_post_event - called to post an even on an fc_host.
 485  * @shost:              host the event occurred on
 486  * @event_number:       fc event number obtained from get_fc_event_number()
 487  * @event_code:         fc_host event being posted
 488  * @event_data:         32bits of data for the event being posted
 489  *
 490  * Notes:
 491  *      This routine assumes no locks are held on entry.
 492  */
 493 void
 494 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
 495                 enum fc_host_event_code event_code, u32 event_data)
 496 {
 497         struct sk_buff *skb;
 498         struct nlmsghdr *nlh;
 499         struct fc_nl_event *event;
 500         const char *name;
 501         u32 len, skblen;
 502         int err;
 503
 504         if (!scsi_nl_sock) {
 505                 err = -ENOENT;
 506                 goto send_fail;
 507         }
 508
 509         len = FC_NL_MSGALIGN(sizeof(*event));
 510         skblen = NLMSG_SPACE(len);
 511
 512         skb = alloc_skb(skblen, GFP_KERNEL);
 513         if (!skb) {
 514                 err = -ENOBUFS;
 515                 goto send_fail;
 516         }
 517
 518         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 519                                 skblen - sizeof(*nlh), 0);
 520         if (!nlh) {
 521                 err = -ENOBUFS;
 522                 goto send_fail_skb;
 523         }
 524         event = NLMSG_DATA(nlh);
 525
 526         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 527                                 FC_NL_ASYNC_EVENT, len);
 528         event->seconds = get_seconds();
 529         event->vendor_id = 0;
 530         event->host_no = shost->host_no;
 531         event->event_datalen = sizeof(u32);     /* bytes */
 532         event->event_num = event_number;
 533         event->event_code = event_code;
 534         event->event_data = event_data;
 535
 536         err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 537                               GFP_KERNEL);
 538         if (err && (err != -ESRCH))     /* filter no recipient errors */
 539                 /* nlmsg_multicast already kfree_skb'd */
 540                 goto send_fail;
 541
 542         return;
 543
 544 send_fail_skb:
 545         kfree_skb(skb);
 546 send_fail:
 547         name = get_fc_host_event_code_name(event_code);
 548         printk(KERN_WARNING
 549                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
 550                 __func__, shost->host_no,
 551                 (name) ? name : "<unknown>", event_data, err);
 552         return;
 553 }
 554 EXPORT_SYMBOL(fc_host_post_event);
 555
 556
 557 /**
 558  * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
 559  * @shost:              host the event occurred on
 560  * @event_number:       fc event number obtained from get_fc_event_number()
 561  * @data_len:           amount, in bytes, of vendor unique data
 562  * @data_buf:           pointer to vendor unique data
 563  * @vendor_id:          Vendor id
 564  *
 565  * Notes:
 566  *      This routine assumes no locks are held on entry.
 567  */
 568 void
 569 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
 570                 u32 data_len, char * data_buf, u64 vendor_id)
 571 {
 572         struct sk_buff *skb;
 573         struct nlmsghdr *nlh;
 574         struct fc_nl_event *event;
 575         u32 len, skblen;
 576         int err;
 577
 578         if (!scsi_nl_sock) {
 579                 err = -ENOENT;
 580                 goto send_vendor_fail;
 581         }
 582
 583         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
 584         skblen = NLMSG_SPACE(len);
 585
 586         skb = alloc_skb(skblen, GFP_KERNEL);
 587         if (!skb) {
 588                 err = -ENOBUFS;
 589                 goto send_vendor_fail;
 590         }
 591
 592         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 593                                 skblen - sizeof(*nlh), 0);
 594         if (!nlh) {
 595                 err = -ENOBUFS;
 596                 goto send_vendor_fail_skb;
 597         }
 598         event = NLMSG_DATA(nlh);
 599
 600         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 601                                 FC_NL_ASYNC_EVENT, len);
 602         event->seconds = get_seconds();
 603         event->vendor_id = vendor_id;
 604         event->host_no = shost->host_no;
 605         event->event_datalen = data_len;        /* bytes */
 606         event->event_num = event_number;
 607         event->event_code = FCH_EVT_VENDOR_UNIQUE;
 608         memcpy(&event->event_data, data_buf, data_len);
 609
 610         err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 611                               GFP_KERNEL);
 612         if (err && (err != -ESRCH))     /* filter no recipient errors */
 613                 /* nlmsg_multicast already kfree_skb'd */
 614                 goto send_vendor_fail;
 615
 616         return;
 617
 618 send_vendor_fail_skb:
 619         kfree_skb(skb);
 620 send_vendor_fail:
 621         printk(KERN_WARNING
 622                 "%s: Dropped Event : host %d vendor_unique - err %d\n",
 623                 __func__, shost->host_no, err);
 624         return;
 625 }
 626 EXPORT_SYMBOL(fc_host_post_vendor_event);
 627
 628
 629
 630 static __init int fc_transport_init(void)
 631 {
 632         int error;
 633
 634         atomic_set(&fc_event_seq, 0);
 635
 636         error = transport_class_register(&fc_host_class);
 637         if (error)
 638                 return error;
 639         error = transport_class_register(&fc_vport_class);
 640         if (error)
 641                 return error;
 642         error = transport_class_register(&fc_rport_class);
 643         if (error)
 644                 return error;
 645         return transport_class_register(&fc_transport_class);
 646 }
 647
 648 static void __exit fc_transport_exit(void)
 649 {
 650         transport_class_unregister(&fc_transport_class);
 651         transport_class_unregister(&fc_rport_class);
 652         transport_class_unregister(&fc_host_class);
 653         transport_class_unregister(&fc_vport_class);
 654 }
 655
 656 /*
 657  * FC Remote Port Attribute Management
 658  */
 659
 660 #define fc_rport_show_function(field, format_string, sz, cast)          \
 661 static ssize_t                                                          \
 662 show_fc_rport_##field (struct device *dev,                              \
 663                        struct device_attribute *attr, char *buf)        \
 664 {                                                                       \
 665         struct fc_rport *rport = transport_class_to_rport(dev);         \
 666         struct Scsi_Host *shost = rport_to_shost(rport);                \
 667         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 668         if ((i->f->get_rport_##field) &&                                \
 669             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 670               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 671               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 672                 i->f->get_rport_##field(rport);                         \
 673         return snprintf(buf, sz, format_string, cast rport->field);     \
 674 }
 675
 676 #define fc_rport_store_function(field)                                  \
 677 static ssize_t                                                          \
 678 store_fc_rport_##field(struct device *dev,                              \
 679                        struct device_attribute *attr,                   \
 680                        const char *buf, size_t count)                   \
 681 {                                                                       \
 682         int val;                                                        \
 683         struct fc_rport *rport = transport_class_to_rport(dev);         \
 684         struct Scsi_Host *shost = rport_to_shost(rport);                \
 685         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 686         char *cp;                                                       \
 687         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
 688             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
 689             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
 690                 return -EBUSY;                                          \
 691         val = simple_strtoul(buf, &cp, 0);                              \
 692         if (*cp && (*cp != '\n'))                                       \
 693                 return -EINVAL;                                         \
 694         i->f->set_rport_##field(rport, val);                            \
 695         return count;                                                   \
 696 }
 697
 698 #define fc_rport_rd_attr(field, format_string, sz)                      \
 699         fc_rport_show_function(field, format_string, sz, )              \
 700 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 701                          show_fc_rport_##field, NULL)
 702
 703 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 704         fc_rport_show_function(field, format_string, sz, (cast))        \
 705 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 706                           show_fc_rport_##field, NULL)
 707
 708 #define fc_rport_rw_attr(field, format_string, sz)                      \
 709         fc_rport_show_function(field, format_string, sz, )              \
 710         fc_rport_store_function(field)                                  \
 711 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,          \
 712                         show_fc_rport_##field,                          \
 713                         store_fc_rport_##field)
 714
 715
 716 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 717 static ssize_t                                                          \
 718 show_fc_rport_##field (struct device *dev,                              \
 719                        struct device_attribute *attr, char *buf)        \
 720 {                                                                       \
 721         struct fc_rport *rport = transport_class_to_rport(dev);         \
 722         return snprintf(buf, sz, format_string, cast rport->field);     \
 723 }
 724
 725 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 726         fc_private_rport_show_function(field, format_string, sz, )      \
 727 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 728                          show_fc_rport_##field, NULL)
 729
 730 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 731         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 732 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 733                           show_fc_rport_##field, NULL)
 734
 735
 736 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 737 static ssize_t                                                          \
 738 show_fc_rport_##title (struct device *dev,                              \
 739                        struct device_attribute *attr, char *buf)        \
 740 {                                                                       \
 741         struct fc_rport *rport = transport_class_to_rport(dev);         \
 742         const char *name;                                               \
 743         name = get_fc_##title##_name(rport->title);                     \
 744         if (!name)                                                      \
 745                 return -EINVAL;                                         \
 746         return snprintf(buf, maxlen, "%s\n", name);                     \
 747 }                                                                       \
 748 static FC_DEVICE_ATTR(rport, title, S_IRUGO,                    \
 749                         show_fc_rport_##title, NULL)
 750
 751
 752 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 753         i->private_rport_attrs[count] = device_attr_rport_##field; \
 754         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 755         i->private_rport_attrs[count].store = NULL;                     \
 756         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 757         if (i->f->show_rport_##field)                                   \
 758                 count++
 759
 760 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 761         i->private_rport_attrs[count] = device_attr_rport_##field; \
 762         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 763         i->private_rport_attrs[count].store = NULL;                     \
 764         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 765         count++
 766
 767 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 768         i->private_rport_attrs[count] = device_attr_rport_##field; \
 769         if (!i->f->set_rport_##field) {                                 \
 770                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 771                 i->private_rport_attrs[count].store = NULL;             \
 772         }                                                               \
 773         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 774         if (i->f->show_rport_##field)                                   \
 775                 count++
 776
 777 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
 778 {                                                                       \
 779         i->private_rport_attrs[count] = device_attr_rport_##field; \
 780         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 781         count++;                                                        \
 782 }
 783
 784
 785 /* The FC Transport Remote Port Attributes: */
 786
 787 /* Fixed Remote Port Attributes */
 788
 789 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 790
 791 static ssize_t
 792 show_fc_rport_supported_classes (struct device *dev,
 793                                  struct device_attribute *attr, char *buf)
 794 {
 795         struct fc_rport *rport = transport_class_to_rport(dev);
 796         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 797                 return snprintf(buf, 20, "unspecified\n");
 798         return get_fc_cos_names(rport->supported_classes, buf);
 799 }
 800 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 801                 show_fc_rport_supported_classes, NULL);
 802
 803 /* Dynamic Remote Port Attributes */
 804
 805 /*
 806  * dev_loss_tmo attribute
 807  */
 808 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
 809 static ssize_t
 810 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
 811                             const char *buf, size_t count)
 812 {
 813         int val;
 814         struct fc_rport *rport = transport_class_to_rport(dev);
 815         struct Scsi_Host *shost = rport_to_shost(rport);
 816         struct fc_internal *i = to_fc_internal(shost->transportt);
 817         char *cp;
 818         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 819             (rport->port_state == FC_PORTSTATE_DELETED) ||
 820             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 821                 return -EBUSY;
 822         val = simple_strtoul(buf, &cp, 0);
 823         if ((*cp && (*cp != '\n')) ||
 824             (val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
 825                 return -EINVAL;
 826         i->f->set_rport_dev_loss_tmo(rport, val);
 827         return count;
 828 }
 829 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
 830                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
 831
 832
 833 /* Private Remote Port Attributes */
 834
 835 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 836 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 837 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 838
 839 static ssize_t
 840 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
 841                      char *buf)
 842 {
 843         struct fc_rport *rport = transport_class_to_rport(dev);
 844
 845         /* identify any roles that are port_id specific */
 846         if ((rport->port_id != -1) &&
 847             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 848                                         FC_WELLKNOWN_PORTID_MASK) {
 849                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 850                 case FC_FPORT_PORTID:
 851                         return snprintf(buf, 30, "Fabric Port\n");
 852                 case FC_FABCTLR_PORTID:
 853                         return snprintf(buf, 30, "Fabric Controller\n");
 854                 case FC_DIRSRVR_PORTID:
 855                         return snprintf(buf, 30, "Directory Server\n");
 856                 case FC_TIMESRVR_PORTID:
 857                         return snprintf(buf, 30, "Time Server\n");
 858                 case FC_MGMTSRVR_PORTID:
 859                         return snprintf(buf, 30, "Management Server\n");
 860                 default:
 861                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 862                 }
 863         } else {
 864                 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
 865                         return snprintf(buf, 20, "unknown\n");
 866                 return get_fc_port_roles_names(rport->roles, buf);
 867         }
 868 }
 869 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
 870                 show_fc_rport_roles, NULL);
 871
 872 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 873 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 874
 875 /*
 876  * fast_io_fail_tmo attribute
 877  */
 878 static ssize_t
 879 show_fc_rport_fast_io_fail_tmo (struct device *dev,
 880                                 struct device_attribute *attr, char *buf)
 881 {
 882         struct fc_rport *rport = transport_class_to_rport(dev);
 883
 884         if (rport->fast_io_fail_tmo == -1)
 885                 return snprintf(buf, 5, "off\n");
 886         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
 887 }
 888
 889 static ssize_t
 890 store_fc_rport_fast_io_fail_tmo(struct device *dev,
 891                                 struct device_attribute *attr, const char *buf,
 892                                 size_t count)
 893 {
 894         int val;
 895         char *cp;
 896         struct fc_rport *rport = transport_class_to_rport(dev);
 897
 898         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 899             (rport->port_state == FC_PORTSTATE_DELETED) ||
 900             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 901                 return -EBUSY;
 902         if (strncmp(buf, "off", 3) == 0)
 903                 rport->fast_io_fail_tmo = -1;
 904         else {
 905                 val = simple_strtoul(buf, &cp, 0);
 906                 if ((*cp && (*cp != '\n')) ||
 907                     (val < 0) || (val >= rport->dev_loss_tmo))
 908                         return -EINVAL;
 909                 rport->fast_io_fail_tmo = val;
 910         }
 911         return count;
 912 }
 913 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
 914         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
 915
 916
 917 /*
 918  * FC SCSI Target Attribute Management
 919  */
 920
 921 /*
 922  * Note: in the target show function we recognize when the remote
 923  *  port is in the heirarchy and do not allow the driver to get
 924  *  involved in sysfs functions. The driver only gets involved if
 925  *  it's the "old" style that doesn't use rports.
 926  */
 927 #define fc_starget_show_function(field, format_string, sz, cast)        \
 928 static ssize_t                                                          \
 929 show_fc_starget_##field (struct device *dev,                            \
 930                          struct device_attribute *attr, char *buf)      \
 931 {                                                                       \
 932         struct scsi_target *starget = transport_class_to_starget(dev);  \
 933         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 934         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 935         struct fc_rport *rport = starget_to_rport(starget);             \
 936         if (rport)                                                      \
 937                 fc_starget_##field(starget) = rport->field;             \
 938         else if (i->f->get_starget_##field)                             \
 939                 i->f->get_starget_##field(starget);                     \
 940         return snprintf(buf, sz, format_string,                         \
 941                 cast fc_starget_##field(starget));                      \
 942 }
 943
 944 #define fc_starget_rd_attr(field, format_string, sz)                    \
 945         fc_starget_show_function(field, format_string, sz, )            \
 946 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
 947                          show_fc_starget_##field, NULL)
 948
 949 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
 950         fc_starget_show_function(field, format_string, sz, (cast))      \
 951 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
 952                           show_fc_starget_##field, NULL)
 953
 954 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
 955         i->private_starget_attrs[count] = device_attr_starget_##field; \
 956         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
 957         i->private_starget_attrs[count].store = NULL;                   \
 958         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 959         if (i->f->show_starget_##field)                                 \
 960                 count++
 961
 962 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
 963         i->private_starget_attrs[count] = device_attr_starget_##field; \
 964         if (!i->f->set_starget_##field) {                               \
 965                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
 966                 i->private_starget_attrs[count].store = NULL;           \
 967         }                                                               \
 968         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
 969         if (i->f->show_starget_##field)                                 \
 970                 count++
 971
 972 /* The FC Transport SCSI Target Attributes: */
 973 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 974 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 975 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
 976
 977
 978 /*
 979  * FC Virtual Port Attribute Management
 980  */
 981
 982 #define fc_vport_show_function(field, format_string, sz, cast)          \
 983 static ssize_t                                                          \
 984 show_fc_vport_##field (struct device *dev,                              \
 985                        struct device_attribute *attr, char *buf)        \
 986 {                                                                       \
 987         struct fc_vport *vport = transport_class_to_vport(dev);         \
 988         struct Scsi_Host *shost = vport_to_shost(vport);                \
 989         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 990         if ((i->f->get_vport_##field) &&                                \
 991             !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))       \
 992                 i->f->get_vport_##field(vport);                         \
 993         return snprintf(buf, sz, format_string, cast vport->field);     \
 994 }
 995
 996 #define fc_vport_store_function(field)                                  \
 997 static ssize_t                                                          \
 998 store_fc_vport_##field(struct device *dev,                              \
 999                        struct device_attribute *attr,                   \
1000                        const char *buf, size_t count)                   \
1001 {                                                                       \
1002         int val;                                                        \
1003         struct fc_vport *vport = transport_class_to_vport(dev);         \
1004         struct Scsi_Host *shost = vport_to_shost(vport);                \
1005         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1006         char *cp;                                                       \
1007         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))  \
1008                 return -EBUSY;                                          \
1009         val = simple_strtoul(buf, &cp, 0);                              \
1010         if (*cp && (*cp != '\n'))                                       \
1011                 return -EINVAL;                                         \
1012         i->f->set_vport_##field(vport, val);                            \
1013         return count;                                                   \
1014 }
1015
1016 #define fc_vport_store_str_function(field, slen)                        \
1017 static ssize_t                                                          \
1018 store_fc_vport_##field(struct device *dev,                              \
1019                        struct device_attribute *attr,                   \
1020                        const char *buf, size_t count)                   \
1021 {                                                                       \
1022         struct fc_vport *vport = transport_class_to_vport(dev);         \
1023         struct Scsi_Host *shost = vport_to_shost(vport);                \
1024         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1025         unsigned int cnt=count;                                         \
1026                                                                         \
1027         /* count may include a LF at end of string */                   \
1028         if (buf[cnt-1] == '\n')                                         \
1029                 cnt--;                                                  \
1030         if (cnt > ((slen) - 1))                                         \
1031                 return -EINVAL;                                         \
1032         memcpy(vport->field, buf, cnt);                                 \
1033         i->f->set_vport_##field(vport);                                 \
1034         return count;                                                   \
1035 }
1036
1037 #define fc_vport_rd_attr(field, format_string, sz)                      \
1038         fc_vport_show_function(field, format_string, sz, )              \
1039 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1040                          show_fc_vport_##field, NULL)
1041
1042 #define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
1043         fc_vport_show_function(field, format_string, sz, (cast))        \
1044 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1045                           show_fc_vport_##field, NULL)
1046
1047 #define fc_vport_rw_attr(field, format_string, sz)                      \
1048         fc_vport_show_function(field, format_string, sz, )              \
1049         fc_vport_store_function(field)                                  \
1050 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1051                         show_fc_vport_##field,                          \
1052                         store_fc_vport_##field)
1053
1054 #define fc_private_vport_show_function(field, format_string, sz, cast)  \
1055 static ssize_t                                                          \
1056 show_fc_vport_##field (struct device *dev,                              \
1057                        struct device_attribute *attr, char *buf)        \
1058 {                                                                       \
1059         struct fc_vport *vport = transport_class_to_vport(dev);         \
1060         return snprintf(buf, sz, format_string, cast vport->field);     \
1061 }
1062
1063 #define fc_private_vport_store_u32_function(field)                      \
1064 static ssize_t                                                          \
1065 store_fc_vport_##field(struct device *dev,                              \
1066                        struct device_attribute *attr,                   \
1067                        const char *buf, size_t count)                   \
1068 {                                                                       \
1069         u32 val;                                                        \
1070         struct fc_vport *vport = transport_class_to_vport(dev);         \
1071         char *cp;                                                       \
1072         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))          \
1073                 return -EBUSY;                                          \
1074         val = simple_strtoul(buf, &cp, 0);                              \
1075         if (*cp && (*cp != '\n'))                                       \
1076                 return -EINVAL;                                         \
1077         vport->field = val;                                             \
1078         return count;                                                   \
1079 }
1080
1081
1082 #define fc_private_vport_rd_attr(field, format_string, sz)              \
1083         fc_private_vport_show_function(field, format_string, sz, )      \
1084 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1085                          show_fc_vport_##field, NULL)
1086
1087 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
1088         fc_private_vport_show_function(field, format_string, sz, (cast)) \
1089 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1090                           show_fc_vport_##field, NULL)
1091
1092 #define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
1093         fc_private_vport_show_function(field, format_string, sz, )      \
1094         fc_private_vport_store_u32_function(field)                      \
1095 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1096                         show_fc_vport_##field,                          \
1097                         store_fc_vport_##field)
1098
1099
1100 #define fc_private_vport_rd_enum_attr(title, maxlen)                    \
1101 static ssize_t                                                          \
1102 show_fc_vport_##title (struct device *dev,                              \
1103                        struct device_attribute *attr,                   \
1104                        char *buf)                                       \
1105 {                                                                       \
1106         struct fc_vport *vport = transport_class_to_vport(dev);         \
1107         const char *name;                                               \
1108         name = get_fc_##title##_name(vport->title);                     \
1109         if (!name)                                                      \
1110                 return -EINVAL;                                         \
1111         return snprintf(buf, maxlen, "%s\n", name);                     \
1112 }                                                                       \
1113 static FC_DEVICE_ATTR(vport, title, S_IRUGO,                    \
1114                         show_fc_vport_##title, NULL)
1115
1116
1117 #define SETUP_VPORT_ATTRIBUTE_RD(field)                                 \
1118         i->private_vport_attrs[count] = device_attr_vport_##field; \
1119         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1120         i->private_vport_attrs[count].store = NULL;                     \
1121         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1122         if (i->f->get_##field)                                          \
1123                 count++
1124         /* NOTE: Above MACRO differs: checks function not show bit */
1125
1126 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                         \
1127         i->private_vport_attrs[count] = device_attr_vport_##field; \
1128         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1129         i->private_vport_attrs[count].store = NULL;                     \
1130         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1131         count++
1132
1133 #define SETUP_VPORT_ATTRIBUTE_WR(field)                                 \
1134         i->private_vport_attrs[count] = device_attr_vport_##field; \
1135         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1136         if (i->f->field)                                                \
1137                 count++
1138         /* NOTE: Above MACRO differs: checks function */
1139
1140 #define SETUP_VPORT_ATTRIBUTE_RW(field)                                 \
1141         i->private_vport_attrs[count] = device_attr_vport_##field; \
1142         if (!i->f->set_vport_##field) {                                 \
1143                 i->private_vport_attrs[count].attr.mode = S_IRUGO;      \
1144                 i->private_vport_attrs[count].store = NULL;             \
1145         }                                                               \
1146         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1147         count++
1148         /* NOTE: Above MACRO differs: does not check show bit */
1149
1150 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                         \
1151 {                                                                       \
1152         i->private_vport_attrs[count] = device_attr_vport_##field; \
1153         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1154         count++;                                                        \
1155 }
1156
1157
1158 /* The FC Transport Virtual Port Attributes: */
1159
1160 /* Fixed Virtual Port Attributes */
1161
1162 /* Dynamic Virtual Port Attributes */
1163
1164 /* Private Virtual Port Attributes */
1165
1166 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1167 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1168 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1169 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1170
1171 static ssize_t
1172 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1173                      char *buf)
1174 {
1175         struct fc_vport *vport = transport_class_to_vport(dev);
1176
1177         if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1178                 return snprintf(buf, 20, "unknown\n");
1179         return get_fc_port_roles_names(vport->roles, buf);
1180 }
1181 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1182
1183 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1184
1185 fc_private_vport_show_function(symbolic_name, "%s\n",
1186                 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1187 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1188 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1189                 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1190
1191 static ssize_t
1192 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1193                       const char *buf, size_t count)
1194 {
1195         struct fc_vport *vport = transport_class_to_vport(dev);
1196         struct Scsi_Host *shost = vport_to_shost(vport);
1197
1198         fc_queue_work(shost, &vport->vport_delete_work);
1199         return count;
1200 }
1201 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1202                         NULL, store_fc_vport_delete);
1203
1204
1205 /*
1206  * Enable/Disable vport
1207  *  Write "1" to disable, write "0" to enable
1208  */
1209 static ssize_t
1210 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1211                        const char *buf,
1212                            size_t count)
1213 {
1214         struct fc_vport *vport = transport_class_to_vport(dev);
1215         struct Scsi_Host *shost = vport_to_shost(vport);
1216         struct fc_internal *i = to_fc_internal(shost->transportt);
1217         int stat;
1218
1219         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1220                 return -EBUSY;
1221
1222         if (*buf == '0') {
1223                 if (vport->vport_state != FC_VPORT_DISABLED)
1224                         return -EALREADY;
1225         } else if (*buf == '1') {
1226                 if (vport->vport_state == FC_VPORT_DISABLED)
1227                         return -EALREADY;
1228         } else
1229                 return -EINVAL;
1230
1231         stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1232         return stat ? stat : count;
1233 }
1234 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1235                         NULL, store_fc_vport_disable);
1236
1237
1238 /*
1239  * Host Attribute Management
1240  */
1241
1242 #define fc_host_show_function(field, format_string, sz, cast)           \
1243 static ssize_t                                                          \
1244 show_fc_host_##field (struct device *dev,                               \
1245                       struct device_attribute *attr, char *buf)         \
1246 {                                                                       \
1247         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1248         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1249         if (i->f->get_host_##field)                                     \
1250                 i->f->get_host_##field(shost);                          \
1251         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1252 }
1253
1254 #define fc_host_store_function(field)                                   \
1255 static ssize_t                                                          \
1256 store_fc_host_##field(struct device *dev,                               \
1257                       struct device_attribute *attr,                    \
1258                       const char *buf,  size_t count)                   \
1259 {                                                                       \
1260         int val;                                                        \
1261         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1262         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1263         char *cp;                                                       \
1264                                                                         \
1265         val = simple_strtoul(buf, &cp, 0);                              \
1266         if (*cp && (*cp != '\n'))                                       \
1267                 return -EINVAL;                                         \
1268         i->f->set_host_##field(shost, val);                             \
1269         return count;                                                   \
1270 }
1271
1272 #define fc_host_store_str_function(field, slen)                         \
1273 static ssize_t                                                          \
1274 store_fc_host_##field(struct device *dev,                               \
1275                       struct device_attribute *attr,                    \
1276                       const char *buf, size_t count)                    \
1277 {                                                                       \
1278         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1279         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1280         unsigned int cnt=count;                                         \
1281                                                                         \
1282         /* count may include a LF at end of string */                   \
1283         if (buf[cnt-1] == '\n')                                         \
1284                 cnt--;                                                  \
1285         if (cnt > ((slen) - 1))                                         \
1286                 return -EINVAL;                                         \
1287         memcpy(fc_host_##field(shost), buf, cnt);                       \
1288         i->f->set_host_##field(shost);                                  \
1289         return count;                                                   \
1290 }
1291
1292 #define fc_host_rd_attr(field, format_string, sz)                       \
1293         fc_host_show_function(field, format_string, sz, )               \
1294 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1295                          show_fc_host_##field, NULL)
1296
1297 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
1298         fc_host_show_function(field, format_string, sz, (cast))         \
1299 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1300                           show_fc_host_##field, NULL)
1301
1302 #define fc_host_rw_attr(field, format_string, sz)                       \
1303         fc_host_show_function(field, format_string, sz, )               \
1304         fc_host_store_function(field)                                   \
1305 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,           \
1306                         show_fc_host_##field,                           \
1307                         store_fc_host_##field)
1308
1309 #define fc_host_rd_enum_attr(title, maxlen)                             \
1310 static ssize_t                                                          \
1311 show_fc_host_##title (struct device *dev,                               \
1312                       struct device_attribute *attr, char *buf)         \
1313 {                                                                       \
1314         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1315         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1316         const char *name;                                               \
1317         if (i->f->get_host_##title)                                     \
1318                 i->f->get_host_##title(shost);                          \
1319         name = get_fc_##title##_name(fc_host_##title(shost));           \
1320         if (!name)                                                      \
1321                 return -EINVAL;                                         \
1322         return snprintf(buf, maxlen, "%s\n", name);                     \
1323 }                                                                       \
1324 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1325
1326 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
1327         i->private_host_attrs[count] = device_attr_host_##field;        \
1328         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1329         i->private_host_attrs[count].store = NULL;                      \
1330         i->host_attrs[count] = &i->private_host_attrs[count];           \
1331         if (i->f->show_host_##field)                                    \
1332                 count++
1333
1334 #define SETUP_HOST_ATTRIBUTE_RD_NS(field)                               \
1335         i->private_host_attrs[count] = device_attr_host_##field;        \
1336         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1337         i->private_host_attrs[count].store = NULL;                      \
1338         i->host_attrs[count] = &i->private_host_attrs[count];           \
1339         count++
1340
1341 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1342         i->private_host_attrs[count] = device_attr_host_##field;        \
1343         if (!i->f->set_host_##field) {                                  \
1344                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1345                 i->private_host_attrs[count].store = NULL;              \
1346         }                                                               \
1347         i->host_attrs[count] = &i->private_host_attrs[count];           \
1348         if (i->f->show_host_##field)                                    \
1349                 count++
1350
1351
1352 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1353 static ssize_t                                                          \
1354 show_fc_host_##field (struct device *dev,                               \
1355                       struct device_attribute *attr, char *buf)         \
1356 {                                                                       \
1357         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1358         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1359 }
1360
1361 #define fc_private_host_rd_attr(field, format_string, sz)               \
1362         fc_private_host_show_function(field, format_string, sz, )       \
1363 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1364                          show_fc_host_##field, NULL)
1365
1366 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1367         fc_private_host_show_function(field, format_string, sz, (cast)) \
1368 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1369                           show_fc_host_##field, NULL)
1370
1371 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1372         i->private_host_attrs[count] = device_attr_host_##field;        \
1373         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1374         i->private_host_attrs[count].store = NULL;                      \
1375         i->host_attrs[count] = &i->private_host_attrs[count];           \
1376         count++
1377
1378 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1379 {                                                                       \
1380         i->private_host_attrs[count] = device_attr_host_##field;        \
1381         i->host_attrs[count] = &i->private_host_attrs[count];           \
1382         count++;                                                        \
1383 }
1384
1385
1386 /* Fixed Host Attributes */
1387
1388 static ssize_t
1389 show_fc_host_supported_classes (struct device *dev,
1390                                 struct device_attribute *attr, char *buf)
1391 {
1392         struct Scsi_Host *shost = transport_class_to_shost(dev);
1393
1394         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1395                 return snprintf(buf, 20, "unspecified\n");
1396
1397         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1398 }
1399 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1400                 show_fc_host_supported_classes, NULL);
1401
1402 static ssize_t
1403 show_fc_host_supported_fc4s (struct device *dev,
1404                              struct device_attribute *attr, char *buf)
1405 {
1406         struct Scsi_Host *shost = transport_class_to_shost(dev);
1407         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1408 }
1409 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1410                 show_fc_host_supported_fc4s, NULL);
1411
1412 static ssize_t
1413 show_fc_host_supported_speeds (struct device *dev,
1414                                struct device_attribute *attr, char *buf)
1415 {
1416         struct Scsi_Host *shost = transport_class_to_shost(dev);
1417
1418         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1419                 return snprintf(buf, 20, "unknown\n");
1420
1421         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1422 }
1423 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1424                 show_fc_host_supported_speeds, NULL);
1425
1426
1427 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1428 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1429 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1430                              unsigned long long);
1431 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1432 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1433 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1434
1435
1436 /* Dynamic Host Attributes */
1437
1438 static ssize_t
1439 show_fc_host_active_fc4s (struct device *dev,
1440                           struct device_attribute *attr, char *buf)
1441 {
1442         struct Scsi_Host *shost = transport_class_to_shost(dev);
1443         struct fc_internal *i = to_fc_internal(shost->transportt);
1444
1445         if (i->f->get_host_active_fc4s)
1446                 i->f->get_host_active_fc4s(shost);
1447
1448         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1449 }
1450 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1451                 show_fc_host_active_fc4s, NULL);
1452
1453 static ssize_t
1454 show_fc_host_speed (struct device *dev,
1455                     struct device_attribute *attr, char *buf)
1456 {
1457         struct Scsi_Host *shost = transport_class_to_shost(dev);
1458         struct fc_internal *i = to_fc_internal(shost->transportt);
1459
1460         if (i->f->get_host_speed)
1461                 i->f->get_host_speed(shost);
1462
1463         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1464                 return snprintf(buf, 20, "unknown\n");
1465
1466         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1467 }
1468 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1469                 show_fc_host_speed, NULL);
1470
1471
1472 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1473 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1474 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1475 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1476 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1477
1478 fc_private_host_show_function(system_hostname, "%s\n",
1479                 FC_SYMBOLIC_NAME_SIZE + 1, )
1480 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1481 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1482                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1483
1484
1485 /* Private Host Attributes */
1486
1487 static ssize_t
1488 show_fc_private_host_tgtid_bind_type(struct device *dev,
1489                                      struct device_attribute *attr, char *buf)
1490 {
1491         struct Scsi_Host *shost = transport_class_to_shost(dev);
1492         const char *name;
1493
1494         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1495         if (!name)
1496                 return -EINVAL;
1497         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1498 }
1499
1500 #define get_list_head_entry(pos, head, member)          \
1501         pos = list_entry((head)->next, typeof(*pos), member)
1502
1503 static ssize_t
1504 store_fc_private_host_tgtid_bind_type(struct device *dev,
1505         struct device_attribute *attr, const char *buf, size_t count)
1506 {
1507         struct Scsi_Host *shost = transport_class_to_shost(dev);
1508         struct fc_rport *rport;
1509         enum fc_tgtid_binding_type val;
1510         unsigned long flags;
1511
1512         if (get_fc_tgtid_bind_type_match(buf, &val))
1513                 return -EINVAL;
1514
1515         /* if changing bind type, purge all unused consistent bindings */
1516         if (val != fc_host_tgtid_bind_type(shost)) {
1517                 spin_lock_irqsave(shost->host_lock, flags);
1518                 while (!list_empty(&fc_host_rport_bindings(shost))) {
1519                         get_list_head_entry(rport,
1520                                 &fc_host_rport_bindings(shost), peers);
1521                         list_del(&rport->peers);
1522                         rport->port_state = FC_PORTSTATE_DELETED;
1523                         fc_queue_work(shost, &rport->rport_delete_work);
1524                 }
1525                 spin_unlock_irqrestore(shost->host_lock, flags);
1526         }
1527
1528         fc_host_tgtid_bind_type(shost) = val;
1529         return count;
1530 }
1531
1532 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1533                         show_fc_private_host_tgtid_bind_type,
1534                         store_fc_private_host_tgtid_bind_type);
1535
1536 static ssize_t
1537 store_fc_private_host_issue_lip(struct device *dev,
1538         struct device_attribute *attr, const char *buf, size_t count)
1539 {
1540         struct Scsi_Host *shost = transport_class_to_shost(dev);
1541         struct fc_internal *i = to_fc_internal(shost->transportt);
1542         int ret;
1543
1544         /* ignore any data value written to the attribute */
1545         if (i->f->issue_fc_host_lip) {
1546                 ret = i->f->issue_fc_host_lip(shost);
1547                 return ret ? ret: count;
1548         }
1549
1550         return -ENOENT;
1551 }
1552
1553 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1554                         store_fc_private_host_issue_lip);
1555
1556 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1557
1558
1559 /*
1560  * Host Statistics Management
1561  */
1562
1563 /* Show a given an attribute in the statistics group */
1564 static ssize_t
1565 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1566 {
1567         struct Scsi_Host *shost = transport_class_to_shost(dev);
1568         struct fc_internal *i = to_fc_internal(shost->transportt);
1569         struct fc_host_statistics *stats;
1570         ssize_t ret = -ENOENT;
1571
1572         if (offset > sizeof(struct fc_host_statistics) ||
1573             offset % sizeof(u64) != 0)
1574                 WARN_ON(1);
1575
1576         if (i->f->get_fc_host_stats) {
1577                 stats = (i->f->get_fc_host_stats)(shost);
1578                 if (stats)
1579                         ret = snprintf(buf, 20, "0x%llx\n",
1580                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1581         }
1582         return ret;
1583 }
1584
1585
1586 /* generate a read-only statistics attribute */
1587 #define fc_host_statistic(name)                                         \
1588 static ssize_t show_fcstat_##name(struct device *cd,                    \
1589                                   struct device_attribute *attr,        \
1590                                   char *buf)                            \
1591 {                                                                       \
1592         return fc_stat_show(cd, buf,                                    \
1593                             offsetof(struct fc_host_statistics, name)); \
1594 }                                                                       \
1595 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1596
1597 fc_host_statistic(seconds_since_last_reset);
1598 fc_host_statistic(tx_frames);
1599 fc_host_statistic(tx_words);
1600 fc_host_statistic(rx_frames);
1601 fc_host_statistic(rx_words);
1602 fc_host_statistic(lip_count);
1603 fc_host_statistic(nos_count);
1604 fc_host_statistic(error_frames);
1605 fc_host_statistic(dumped_frames);
1606 fc_host_statistic(link_failure_count);
1607 fc_host_statistic(loss_of_sync_count);
1608 fc_host_statistic(loss_of_signal_count);
1609 fc_host_statistic(prim_seq_protocol_err_count);
1610 fc_host_statistic(invalid_tx_word_count);
1611 fc_host_statistic(invalid_crc_count);
1612 fc_host_statistic(fcp_input_requests);
1613 fc_host_statistic(fcp_output_requests);
1614 fc_host_statistic(fcp_control_requests);
1615 fc_host_statistic(fcp_input_megabytes);
1616 fc_host_statistic(fcp_output_megabytes);
1617
1618 static ssize_t
1619 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1620                     const char *buf, size_t count)
1621 {
1622         struct Scsi_Host *shost = transport_class_to_shost(dev);
1623         struct fc_internal *i = to_fc_internal(shost->transportt);
1624
1625         /* ignore any data value written to the attribute */
1626         if (i->f->reset_fc_host_stats) {
1627                 i->f->reset_fc_host_stats(shost);
1628                 return count;
1629         }
1630
1631         return -ENOENT;
1632 }
1633 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1634                                 fc_reset_statistics);
1635
1636 static struct attribute *fc_statistics_attrs[] = {
1637         &device_attr_host_seconds_since_last_reset.attr,
1638         &device_attr_host_tx_frames.attr,
1639         &device_attr_host_tx_words.attr,
1640         &device_attr_host_rx_frames.attr,
1641         &device_attr_host_rx_words.attr,
1642         &device_attr_host_lip_count.attr,
1643         &device_attr_host_nos_count.attr,
1644         &device_attr_host_error_frames.attr,
1645         &device_attr_host_dumped_frames.attr,
1646         &device_attr_host_link_failure_count.attr,
1647         &device_attr_host_loss_of_sync_count.attr,
1648         &device_attr_host_loss_of_signal_count.attr,
1649         &device_attr_host_prim_seq_protocol_err_count.attr,
1650         &device_attr_host_invalid_tx_word_count.attr,
1651         &device_attr_host_invalid_crc_count.attr,
1652         &device_attr_host_fcp_input_requests.attr,
1653         &device_attr_host_fcp_output_requests.attr,
1654         &device_attr_host_fcp_control_requests.attr,
1655         &device_attr_host_fcp_input_megabytes.attr,
1656         &device_attr_host_fcp_output_megabytes.attr,
1657         &device_attr_host_reset_statistics.attr,
1658         NULL
1659 };
1660
1661 static struct attribute_group fc_statistics_group = {
1662         .name = "statistics",
1663         .attrs = fc_statistics_attrs,
1664 };
1665
1666
1667 /* Host Vport Attributes */
1668
1669 static int
1670 fc_parse_wwn(const char *ns, u64 *nm)
1671 {
1672         unsigned int i, j;
1673         u8 wwn[8];
1674
1675         memset(wwn, 0, sizeof(wwn));
1676
1677         /* Validate and store the new name */
1678         for (i=0, j=0; i < 16; i++) {
1679                 if ((*ns >= 'a') && (*ns <= 'f'))
1680                         j = ((j << 4) | ((*ns++ -'a') + 10));
1681                 else if ((*ns >= 'A') && (*ns <= 'F'))
1682                         j = ((j << 4) | ((*ns++ -'A') + 10));
1683                 else if ((*ns >= '0') && (*ns <= '9'))
1684                         j = ((j << 4) | (*ns++ -'0'));
1685                 else
1686                         return -EINVAL;
1687                 if (i % 2) {
1688                         wwn[i/2] = j & 0xff;
1689                         j = 0;
1690                 }
1691         }
1692
1693         *nm = wwn_to_u64(wwn);
1694
1695         return 0;
1696 }
1697
1698
1699 /*
1700  * "Short-cut" sysfs variable to create a new vport on a FC Host.
1701  * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1702  * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1703  * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1704  */
1705 static ssize_t
1706 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1707                            const char *buf, size_t count)
1708 {
1709         struct Scsi_Host *shost = transport_class_to_shost(dev);
1710         struct fc_vport_identifiers vid;
1711         struct fc_vport *vport;
1712         unsigned int cnt=count;
1713         int stat;
1714
1715         memset(&vid, 0, sizeof(vid));
1716
1717         /* count may include a LF at end of string */
1718         if (buf[cnt-1] == '\n')
1719                 cnt--;
1720
1721         /* validate we have enough characters for WWPN */
1722         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1723                 return -EINVAL;
1724
1725         stat = fc_parse_wwn(&buf[0], &vid.port_name);
1726         if (stat)
1727                 return stat;
1728
1729         stat = fc_parse_wwn(&buf[17], &vid.node_name);
1730         if (stat)
1731                 return stat;
1732
1733         vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1734         vid.vport_type = FC_PORTTYPE_NPIV;
1735         /* vid.symbolic_name is already zero/NULL's */
1736         vid.disable = false;            /* always enabled */
1737
1738         /* we only allow support on Channel 0 !!! */
1739         stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1740         return stat ? stat : count;
1741 }
1742 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1743                         store_fc_host_vport_create);
1744
1745
1746 /*
1747  * "Short-cut" sysfs variable to delete a vport on a FC Host.
1748  * Vport is identified by a string containing "<WWPN>:<WWNN>".
1749  * The WWNs are specified as hex characters, and may *not* contain
1750  * any prefixes (e.g. 0x, x, etc)
1751  */
1752 static ssize_t
1753 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1754                            const char *buf, size_t count)
1755 {
1756         struct Scsi_Host *shost = transport_class_to_shost(dev);
1757         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1758         struct fc_vport *vport;
1759         u64 wwpn, wwnn;
1760         unsigned long flags;
1761         unsigned int cnt=count;
1762         int stat, match;
1763
1764         /* count may include a LF at end of string */
1765         if (buf[cnt-1] == '\n')
1766                 cnt--;
1767
1768         /* validate we have enough characters for WWPN */
1769         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1770                 return -EINVAL;
1771
1772         stat = fc_parse_wwn(&buf[0], &wwpn);
1773         if (stat)
1774                 return stat;
1775
1776         stat = fc_parse_wwn(&buf[17], &wwnn);
1777         if (stat)
1778                 return stat;
1779
1780         spin_lock_irqsave(shost->host_lock, flags);
1781         match = 0;
1782         /* we only allow support on Channel 0 !!! */
1783         list_for_each_entry(vport, &fc_host->vports, peers) {
1784                 if ((vport->channel == 0) &&
1785                     (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1786                         match = 1;
1787                         break;
1788                 }
1789         }
1790         spin_unlock_irqrestore(shost->host_lock, flags);
1791
1792         if (!match)
1793                 return -ENODEV;
1794
1795         stat = fc_vport_terminate(vport);
1796         return stat ? stat : count;
1797 }
1798 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1799                         store_fc_host_vport_delete);
1800
1801
1802 static int fc_host_match(struct attribute_container *cont,
1803                           struct device *dev)
1804 {
1805         struct Scsi_Host *shost;
1806         struct fc_internal *i;
1807
1808         if (!scsi_is_host_device(dev))
1809                 return 0;
1810
1811         shost = dev_to_shost(dev);
1812         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1813             != &fc_host_class.class)
1814                 return 0;
1815
1816         i = to_fc_internal(shost->transportt);
1817
1818         return &i->t.host_attrs.ac == cont;
1819 }
1820
1821 static int fc_target_match(struct attribute_container *cont,
1822                             struct device *dev)
1823 {
1824         struct Scsi_Host *shost;
1825         struct fc_internal *i;
1826
1827         if (!scsi_is_target_device(dev))
1828                 return 0;
1829
1830         shost = dev_to_shost(dev->parent);
1831         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1832             != &fc_host_class.class)
1833                 return 0;
1834
1835         i = to_fc_internal(shost->transportt);
1836
1837         return &i->t.target_attrs.ac == cont;
1838 }
1839
1840 static void fc_rport_dev_release(struct device *dev)
1841 {
1842         struct fc_rport *rport = dev_to_rport(dev);
1843         put_device(dev->parent);
1844         kfree(rport);
1845 }
1846
1847 int scsi_is_fc_rport(const struct device *dev)
1848 {
1849         return dev->release == fc_rport_dev_release;
1850 }
1851 EXPORT_SYMBOL(scsi_is_fc_rport);
1852
1853 static int fc_rport_match(struct attribute_container *cont,
1854                             struct device *dev)
1855 {
1856         struct Scsi_Host *shost;
1857         struct fc_internal *i;
1858
1859         if (!scsi_is_fc_rport(dev))
1860                 return 0;
1861
1862         shost = dev_to_shost(dev->parent);
1863         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1864             != &fc_host_class.class)
1865                 return 0;
1866
1867         i = to_fc_internal(shost->transportt);
1868
1869         return &i->rport_attr_cont.ac == cont;
1870 }
1871
1872
1873 static void fc_vport_dev_release(struct device *dev)
1874 {
1875         struct fc_vport *vport = dev_to_vport(dev);
1876         put_device(dev->parent);                /* release kobj parent */
1877         kfree(vport);
1878 }
1879
1880 int scsi_is_fc_vport(const struct device *dev)
1881 {
1882         return dev->release == fc_vport_dev_release;
1883 }
1884 EXPORT_SYMBOL(scsi_is_fc_vport);
1885
1886 static int fc_vport_match(struct attribute_container *cont,
1887                             struct device *dev)
1888 {
1889         struct fc_vport *vport;
1890         struct Scsi_Host *shost;
1891         struct fc_internal *i;
1892
1893         if (!scsi_is_fc_vport(dev))
1894                 return 0;
1895         vport = dev_to_vport(dev);
1896
1897         shost = vport_to_shost(vport);
1898         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1899             != &fc_host_class.class)
1900                 return 0;
1901
1902         i = to_fc_internal(shost->transportt);
1903         return &i->vport_attr_cont.ac == cont;
1904 }
1905
1906
1907 /**
1908  * fc_timed_out - FC Transport I/O timeout intercept handler
1909  * @scmd:       The SCSI command which timed out
1910  *
1911  * This routine protects against error handlers getting invoked while a
1912  * rport is in a blocked state, typically due to a temporarily loss of
1913  * connectivity. If the error handlers are allowed to proceed, requests
1914  * to abort i/o, reset the target, etc will likely fail as there is no way
1915  * to communicate with the device to perform the requested function. These
1916  * failures may result in the midlayer taking the device offline, requiring
1917  * manual intervention to restore operation.
1918  *
1919  * This routine, called whenever an i/o times out, validates the state of
1920  * the underlying rport. If the rport is blocked, it returns
1921  * EH_RESET_TIMER, which will continue to reschedule the timeout.
1922  * Eventually, either the device will return, or devloss_tmo will fire,
1923  * and when the timeout then fires, it will be handled normally.
1924  * If the rport is not blocked, normal error handling continues.
1925  *
1926  * Notes:
1927  *      This routine assumes no locks are held on entry.
1928  */
1929 static enum blk_eh_timer_return
1930 fc_timed_out(struct scsi_cmnd *scmd)
1931 {
1932         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1933
1934         if (rport->port_state == FC_PORTSTATE_BLOCKED)
1935                 return BLK_EH_RESET_TIMER;
1936
1937         return BLK_EH_NOT_HANDLED;
1938 }
1939
1940 /*
1941  * Called by fc_user_scan to locate an rport on the shost that
1942  * matches the channel and target id, and invoke scsi_scan_target()
1943  * on the rport.
1944  */
1945 static void
1946 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1947 {
1948         struct fc_rport *rport;
1949         unsigned long flags;
1950
1951         spin_lock_irqsave(shost->host_lock, flags);
1952
1953         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1954                 if (rport->scsi_target_id == -1)
1955                         continue;
1956
1957                 if (rport->port_state != FC_PORTSTATE_ONLINE)
1958                         continue;
1959
1960                 if ((channel == rport->channel) &&
1961                     (id == rport->scsi_target_id)) {
1962                         spin_unlock_irqrestore(shost->host_lock, flags);
1963                         scsi_scan_target(&rport->dev, channel, id, lun, 1);
1964                         return;
1965                 }
1966         }
1967
1968         spin_unlock_irqrestore(shost->host_lock, flags);
1969 }
1970
1971 /*
1972  * Called via sysfs scan routines. Necessary, as the FC transport
1973  * wants to place all target objects below the rport object. So this
1974  * routine must invoke the scsi_scan_target() routine with the rport
1975  * object as the parent.
1976  */
1977 static int
1978 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1979 {
1980         uint chlo, chhi;
1981         uint tgtlo, tgthi;
1982
1983         if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
1984             ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
1985             ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1986                 return -EINVAL;
1987
1988         if (channel == SCAN_WILD_CARD) {
1989                 chlo = 0;
1990                 chhi = shost->max_channel + 1;
1991         } else {
1992                 chlo = channel;
1993                 chhi = channel + 1;
1994         }
1995
1996         if (id == SCAN_WILD_CARD) {
1997                 tgtlo = 0;
1998                 tgthi = shost->max_id;
1999         } else {
2000                 tgtlo = id;
2001                 tgthi = id + 1;
2002         }
2003
2004         for ( ; chlo < chhi; chlo++)
2005                 for ( ; tgtlo < tgthi; tgtlo++)
2006                         fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2007
2008         return 0;
2009 }
2010
2011 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2012                                 int result)
2013 {
2014         struct fc_internal *i = to_fc_internal(shost->transportt);
2015         return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2016 }
2017
2018 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2019 {
2020         struct fc_internal *i = to_fc_internal(shost->transportt);
2021         return i->f->it_nexus_response(shost, nexus, result);
2022 }
2023
2024 struct scsi_transport_template *
2025 fc_attach_transport(struct fc_function_template *ft)
2026 {
2027         int count;
2028         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2029                                         GFP_KERNEL);
2030
2031         if (unlikely(!i))
2032                 return NULL;
2033
2034         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2035         i->t.target_attrs.ac.class = &fc_transport_class.class;
2036         i->t.target_attrs.ac.match = fc_target_match;
2037         i->t.target_size = sizeof(struct fc_starget_attrs);
2038         transport_container_register(&i->t.target_attrs);
2039
2040         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2041         i->t.host_attrs.ac.class = &fc_host_class.class;
2042         i->t.host_attrs.ac.match = fc_host_match;
2043         i->t.host_size = sizeof(struct fc_host_attrs);
2044         if (ft->get_fc_host_stats)
2045                 i->t.host_attrs.statistics = &fc_statistics_group;
2046         transport_container_register(&i->t.host_attrs);
2047
2048         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2049         i->rport_attr_cont.ac.class = &fc_rport_class.class;
2050         i->rport_attr_cont.ac.match = fc_rport_match;
2051         transport_container_register(&i->rport_attr_cont);
2052
2053         i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2054         i->vport_attr_cont.ac.class = &fc_vport_class.class;
2055         i->vport_attr_cont.ac.match = fc_vport_match;
2056         transport_container_register(&i->vport_attr_cont);
2057
2058         i->f = ft;
2059
2060         /* Transport uses the shost workq for scsi scanning */
2061         i->t.create_work_queue = 1;
2062
2063         i->t.eh_timed_out = fc_timed_out;
2064
2065         i->t.user_scan = fc_user_scan;
2066
2067         /* target-mode drivers' functions */
2068         i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2069         i->t.it_nexus_response = fc_it_nexus_response;
2070
2071         /*
2072          * Setup SCSI Target Attributes.
2073          */
2074         count = 0;
2075         SETUP_STARGET_ATTRIBUTE_RD(node_name);
2076         SETUP_STARGET_ATTRIBUTE_RD(port_name);
2077         SETUP_STARGET_ATTRIBUTE_RD(port_id);
2078
2079         BUG_ON(count > FC_STARGET_NUM_ATTRS);
2080
2081         i->starget_attrs[count] = NULL;
2082
2083
2084         /*
2085          * Setup SCSI Host Attributes.
2086          */
2087         count=0;
2088         SETUP_HOST_ATTRIBUTE_RD(node_name);
2089         SETUP_HOST_ATTRIBUTE_RD(port_name);
2090         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2091         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2092         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2093         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2094         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2095         if (ft->vport_create) {
2096                 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2097                 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2098         }
2099         SETUP_HOST_ATTRIBUTE_RD(serial_number);
2100
2101         SETUP_HOST_ATTRIBUTE_RD(port_id);
2102         SETUP_HOST_ATTRIBUTE_RD(port_type);
2103         SETUP_HOST_ATTRIBUTE_RD(port_state);
2104         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2105         SETUP_HOST_ATTRIBUTE_RD(speed);
2106         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2107         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2108         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2109
2110         /* Transport-managed attributes */
2111         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2112         if (ft->issue_fc_host_lip)
2113                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2114         if (ft->vport_create)
2115                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2116         if (ft->vport_delete)
2117                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2118
2119         BUG_ON(count > FC_HOST_NUM_ATTRS);
2120
2121         i->host_attrs[count] = NULL;
2122
2123         /*
2124          * Setup Remote Port Attributes.
2125          */
2126         count=0;
2127         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2128         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2129         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2130         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2131         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2132         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2133         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2134         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2135         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2136         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2137
2138         BUG_ON(count > FC_RPORT_NUM_ATTRS);
2139
2140         i->rport_attrs[count] = NULL;
2141
2142         /*
2143          * Setup Virtual Port Attributes.
2144          */
2145         count=0;
2146         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2147         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2148         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2149         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2150         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2151         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2152         SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2153         SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2154         SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2155
2156         BUG_ON(count > FC_VPORT_NUM_ATTRS);
2157
2158         i->vport_attrs[count] = NULL;
2159
2160         return &i->t;
2161 }
2162 EXPORT_SYMBOL(fc_attach_transport);
2163
2164 void fc_release_transport(struct scsi_transport_template *t)
2165 {
2166         struct fc_internal *i = to_fc_internal(t);
2167
2168         transport_container_unregister(&i->t.target_attrs);
2169         transport_container_unregister(&i->t.host_attrs);
2170         transport_container_unregister(&i->rport_attr_cont);
2171         transport_container_unregister(&i->vport_attr_cont);
2172
2173         kfree(i);
2174 }
2175 EXPORT_SYMBOL(fc_release_transport);
2176
2177 /**
2178  * fc_queue_work - Queue work to the fc_host workqueue.
2179  * @shost:      Pointer to Scsi_Host bound to fc_host.
2180  * @work:       Work to queue for execution.
2181  *
2182  * Return value:
2183  *      1 - work queued for execution
2184  *      0 - work is already queued
2185  *      -EINVAL - work queue doesn't exist
2186  */
2187 static int
2188 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2189 {
2190         if (unlikely(!fc_host_work_q(shost))) {
2191                 printk(KERN_ERR
2192                         "ERROR: FC host '%s' attempted to queue work, "
2193                         "when no workqueue created.\n", shost->hostt->name);
2194                 dump_stack();
2195
2196                 return -EINVAL;
2197         }
2198
2199         return queue_work(fc_host_work_q(shost), work);
2200 }
2201
2202 /**
2203  * fc_flush_work - Flush a fc_host's workqueue.
2204  * @shost:      Pointer to Scsi_Host bound to fc_host.
2205  */
2206 static void
2207 fc_flush_work(struct Scsi_Host *shost)
2208 {
2209         if (!fc_host_work_q(shost)) {
2210                 printk(KERN_ERR
2211                         "ERROR: FC host '%s' attempted to flush work, "
2212                         "when no workqueue created.\n", shost->hostt->name);
2213                 dump_stack();
2214                 return;
2215         }
2216
2217         flush_workqueue(fc_host_work_q(shost));
2218 }
2219
2220 /**
2221  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2222  * @shost:      Pointer to Scsi_Host bound to fc_host.
2223  * @work:       Work to queue for execution.
2224  * @delay:      jiffies to delay the work queuing
2225  *
2226  * Return value:
2227  *      1 on success / 0 already queued / < 0 for error
2228  */
2229 static int
2230 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2231                                 unsigned long delay)
2232 {
2233         if (unlikely(!fc_host_devloss_work_q(shost))) {
2234                 printk(KERN_ERR
2235                         "ERROR: FC host '%s' attempted to queue work, "
2236                         "when no workqueue created.\n", shost->hostt->name);
2237                 dump_stack();
2238
2239                 return -EINVAL;
2240         }
2241
2242         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2243 }
2244
2245 /**
2246  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2247  * @shost:      Pointer to Scsi_Host bound to fc_host.
2248  */
2249 static void
2250 fc_flush_devloss(struct Scsi_Host *shost)
2251 {
2252         if (!fc_host_devloss_work_q(shost)) {
2253                 printk(KERN_ERR
2254                         "ERROR: FC host '%s' attempted to flush work, "
2255                         "when no workqueue created.\n", shost->hostt->name);
2256                 dump_stack();
2257                 return;
2258         }
2259
2260         flush_workqueue(fc_host_devloss_work_q(shost));
2261 }
2262
2263
2264 /**
2265  * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2266  * @shost:      Which &Scsi_Host
2267  *
2268  * This routine is expected to be called immediately preceeding the
2269  * a driver's call to scsi_remove_host().
2270  *
2271  * WARNING: A driver utilizing the fc_transport, which fails to call
2272  *   this routine prior to scsi_remove_host(), will leave dangling
2273  *   objects in /sys/class/fc_remote_ports. Access to any of these
2274  *   objects can result in a system crash !!!
2275  *
2276  * Notes:
2277  *      This routine assumes no locks are held on entry.
2278  */
2279 void
2280 fc_remove_host(struct Scsi_Host *shost)
2281 {
2282         struct fc_vport *vport = NULL, *next_vport = NULL;
2283         struct fc_rport *rport = NULL, *next_rport = NULL;
2284         struct workqueue_struct *work_q;
2285         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2286         unsigned long flags;
2287
2288         spin_lock_irqsave(shost->host_lock, flags);
2289
2290         /* Remove any vports */
2291         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2292                 fc_queue_work(shost, &vport->vport_delete_work);
2293
2294         /* Remove any remote ports */
2295         list_for_each_entry_safe(rport, next_rport,
2296                         &fc_host->rports, peers) {
2297                 list_del(&rport->peers);
2298                 rport->port_state = FC_PORTSTATE_DELETED;
2299                 fc_queue_work(shost, &rport->rport_delete_work);
2300         }
2301
2302         list_for_each_entry_safe(rport, next_rport,
2303                         &fc_host->rport_bindings, peers) {
2304                 list_del(&rport->peers);
2305                 rport->port_state = FC_PORTSTATE_DELETED;
2306                 fc_queue_work(shost, &rport->rport_delete_work);
2307         }
2308
2309         spin_unlock_irqrestore(shost->host_lock, flags);
2310
2311         /* flush all scan work items */
2312         scsi_flush_work(shost);
2313
2314         /* flush all stgt delete, and rport delete work items, then kill it  */
2315         if (fc_host->work_q) {
2316                 work_q = fc_host->work_q;
2317                 fc_host->work_q = NULL;
2318                 destroy_workqueue(work_q);
2319         }
2320
2321         /* flush all devloss work items, then kill it  */
2322         if (fc_host->devloss_work_q) {
2323                 work_q = fc_host->devloss_work_q;
2324                 fc_host->devloss_work_q = NULL;
2325                 destroy_workqueue(work_q);
2326         }
2327 }
2328 EXPORT_SYMBOL(fc_remove_host);
2329
2330 static void fc_terminate_rport_io(struct fc_rport *rport)
2331 {
2332         struct Scsi_Host *shost = rport_to_shost(rport);
2333         struct fc_internal *i = to_fc_internal(shost->transportt);
2334
2335         /* Involve the LLDD if possible to terminate all io on the rport. */
2336         if (i->f->terminate_rport_io)
2337                 i->f->terminate_rport_io(rport);
2338
2339         /*
2340          * must unblock to flush queued IO. The caller will have set
2341          * the port_state or flags, so that fc_remote_port_chkready will
2342          * fail IO.
2343          */
2344         scsi_target_unblock(&rport->dev);
2345 }
2346
2347 /**
2348  * fc_starget_delete - called to delete the scsi decendents of an rport
2349  * @work:       remote port to be operated on.
2350  *
2351  * Deletes target and all sdevs.
2352  */
2353 static void
2354 fc_starget_delete(struct work_struct *work)
2355 {
2356         struct fc_rport *rport =
2357                 container_of(work, struct fc_rport, stgt_delete_work);
2358
2359         fc_terminate_rport_io(rport);
2360         scsi_remove_target(&rport->dev);
2361 }
2362
2363
2364 /**
2365  * fc_rport_final_delete - finish rport termination and delete it.
2366  * @work:       remote port to be deleted.
2367  */
2368 static void
2369 fc_rport_final_delete(struct work_struct *work)
2370 {
2371         struct fc_rport *rport =
2372                 container_of(work, struct fc_rport, rport_delete_work);
2373         struct device *dev = &rport->dev;
2374         struct Scsi_Host *shost = rport_to_shost(rport);
2375         struct fc_internal *i = to_fc_internal(shost->transportt);
2376         unsigned long flags;
2377
2378         /*
2379          * if a scan is pending, flush the SCSI Host work_q so that
2380          * that we can reclaim the rport scan work element.
2381          */
2382         if (rport->flags & FC_RPORT_SCAN_PENDING)
2383                 scsi_flush_work(shost);
2384
2385         fc_terminate_rport_io(rport);
2386         /*
2387          * Cancel any outstanding timers. These should really exist
2388          * only when rmmod'ing the LLDD and we're asking for
2389          * immediate termination of the rports
2390          */
2391         spin_lock_irqsave(shost->host_lock, flags);
2392         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2393                 spin_unlock_irqrestore(shost->host_lock, flags);
2394                 if (!cancel_delayed_work(&rport->fail_io_work))
2395                         fc_flush_devloss(shost);
2396                 if (!cancel_delayed_work(&rport->dev_loss_work))
2397                         fc_flush_devloss(shost);
2398                 spin_lock_irqsave(shost->host_lock, flags);
2399                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2400         }
2401         spin_unlock_irqrestore(shost->host_lock, flags);
2402
2403         /* Delete SCSI target and sdevs */
2404         if (rport->scsi_target_id != -1)
2405                 fc_starget_delete(&rport->stgt_delete_work);
2406
2407         /*
2408          * Notify the driver that the rport is now dead. The LLDD will
2409          * also guarantee that any communication to the rport is terminated
2410          *
2411          * Avoid this call if we already called it when we preserved the
2412          * rport for the binding.
2413          */
2414         if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2415             (i->f->dev_loss_tmo_callbk))
2416                 i->f->dev_loss_tmo_callbk(rport);
2417
2418         transport_remove_device(dev);
2419         device_del(dev);
2420         transport_destroy_device(dev);
2421         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2422         put_device(dev);                        /* for self-reference */
2423 }
2424
2425
2426 /**
2427  * fc_rport_create - allocates and creates a remote FC port.
2428  * @shost:      scsi host the remote port is connected to.
2429  * @channel:    Channel on shost port connected to.
2430  * @ids:        The world wide names, fc address, and FC4 port
2431  *              roles for the remote port.
2432  *
2433  * Allocates and creates the remoter port structure, including the
2434  * class and sysfs creation.
2435  *
2436  * Notes:
2437  *      This routine assumes no locks are held on entry.
2438  */
2439 static struct fc_rport *
2440 fc_rport_create(struct Scsi_Host *shost, int channel,
2441         struct fc_rport_identifiers  *ids)
2442 {
2443         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2444         struct fc_internal *fci = to_fc_internal(shost->transportt);
2445         struct fc_rport *rport;
2446         struct device *dev;
2447         unsigned long flags;
2448         int error;
2449         size_t size;
2450
2451         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2452         rport = kzalloc(size, GFP_KERNEL);
2453         if (unlikely(!rport)) {
2454                 printk(KERN_ERR "%s: allocation failure\n", __func__);
2455                 return NULL;
2456         }
2457
2458         rport->maxframe_size = -1;
2459         rport->supported_classes = FC_COS_UNSPECIFIED;
2460         rport->dev_loss_tmo = fc_dev_loss_tmo;
2461         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2462         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2463         rport->port_id = ids->port_id;
2464         rport->roles = ids->roles;
2465         rport->port_state = FC_PORTSTATE_ONLINE;
2466         if (fci->f->dd_fcrport_size)
2467                 rport->dd_data = &rport[1];
2468         rport->channel = channel;
2469         rport->fast_io_fail_tmo = -1;
2470
2471         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2472         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2473         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2474         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2475         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2476
2477         spin_lock_irqsave(shost->host_lock, flags);
2478
2479         rport->number = fc_host->next_rport_number++;
2480         if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2481                 rport->scsi_target_id = fc_host->next_target_id++;
2482         else
2483                 rport->scsi_target_id = -1;
2484         list_add_tail(&rport->peers, &fc_host->rports);
2485         get_device(&shost->shost_gendev);       /* for fc_host->rport list */
2486
2487         spin_unlock_irqrestore(shost->host_lock, flags);
2488
2489         dev = &rport->dev;
2490         device_initialize(dev);                 /* takes self reference */
2491         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2492         dev->release = fc_rport_dev_release;
2493         dev_set_name(dev, "rport-%d:%d-%d",
2494                      shost->host_no, channel, rport->number);
2495         transport_setup_device(dev);
2496
2497         error = device_add(dev);
2498         if (error) {
2499                 printk(KERN_ERR "FC Remote Port device_add failed\n");
2500                 goto delete_rport;
2501         }
2502         transport_add_device(dev);
2503         transport_configure_device(dev);
2504
2505         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2506                 /* initiate a scan of the target */
2507                 rport->flags |= FC_RPORT_SCAN_PENDING;
2508                 scsi_queue_work(shost, &rport->scan_work);
2509         }
2510
2511         return rport;
2512
2513 delete_rport:
2514         transport_destroy_device(dev);
2515         spin_lock_irqsave(shost->host_lock, flags);
2516         list_del(&rport->peers);
2517         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2518         spin_unlock_irqrestore(shost->host_lock, flags);
2519         put_device(dev->parent);
2520         kfree(rport);
2521         return NULL;
2522 }
2523
2524 /**
2525  * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2526  * @shost:      scsi host the remote port is connected to.
2527  * @channel:    Channel on shost port connected to.
2528  * @ids:        The world wide names, fc address, and FC4 port
2529  *              roles for the remote port.
2530  *
2531  * The LLDD calls this routine to notify the transport of the existence
2532  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2533  * of the port, it's FC address (port_id), and the FC4 roles that are
2534  * active for the port.
2535  *
2536  * For ports that are FCP targets (aka scsi targets), the FC transport
2537  * maintains consistent target id bindings on behalf of the LLDD.
2538  * A consistent target id binding is an assignment of a target id to
2539  * a remote port identifier, which persists while the scsi host is
2540  * attached. The remote port can disappear, then later reappear, and
2541  * it's target id assignment remains the same. This allows for shifts
2542  * in FC addressing (if binding by wwpn or wwnn) with no apparent
2543  * changes to the scsi subsystem which is based on scsi host number and
2544  * target id values.  Bindings are only valid during the attachment of
2545  * the scsi host. If the host detaches, then later re-attaches, target
2546  * id bindings may change.
2547  *
2548  * This routine is responsible for returning a remote port structure.
2549  * The routine will search the list of remote ports it maintains
2550  * internally on behalf of consistent target id mappings. If found, the
2551  * remote port structure will be reused. Otherwise, a new remote port
2552  * structure will be allocated.
2553  *
2554  * Whenever a remote port is allocated, a new fc_remote_port class
2555  * device is created.
2556  *
2557  * Should not be called from interrupt context.
2558  *
2559  * Notes:
2560  *      This routine assumes no locks are held on entry.
2561  */
2562 struct fc_rport *
2563 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2564         struct fc_rport_identifiers  *ids)
2565 {
2566         struct fc_internal *fci = to_fc_internal(shost->transportt);
2567         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2568         struct fc_rport *rport;
2569         unsigned long flags;
2570         int match = 0;
2571
2572         /* ensure any stgt delete functions are done */
2573         fc_flush_work(shost);
2574
2575         /*
2576          * Search the list of "active" rports, for an rport that has been
2577          * deleted, but we've held off the real delete while the target
2578          * is in a "blocked" state.
2579          */
2580         spin_lock_irqsave(shost->host_lock, flags);
2581
2582         list_for_each_entry(rport, &fc_host->rports, peers) {
2583
2584                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2585                         (rport->channel == channel)) {
2586
2587                         switch (fc_host->tgtid_bind_type) {
2588                         case FC_TGTID_BIND_BY_WWPN:
2589                         case FC_TGTID_BIND_NONE:
2590                                 if (rport->port_name == ids->port_name)
2591                                         match = 1;
2592                                 break;
2593                         case FC_TGTID_BIND_BY_WWNN:
2594                                 if (rport->node_name == ids->node_name)
2595                                         match = 1;
2596                                 break;
2597                         case FC_TGTID_BIND_BY_ID:
2598                                 if (rport->port_id == ids->port_id)
2599                                         match = 1;
2600                                 break;
2601                         }
2602
2603                         if (match) {
2604
2605                                 memcpy(&rport->node_name, &ids->node_name,
2606                                         sizeof(rport->node_name));
2607                                 memcpy(&rport->port_name, &ids->port_name,
2608                                         sizeof(rport->port_name));
2609                                 rport->port_id = ids->port_id;
2610
2611                                 rport->port_state = FC_PORTSTATE_ONLINE;
2612                                 rport->roles = ids->roles;
2613
2614                                 spin_unlock_irqrestore(shost->host_lock, flags);
2615
2616                                 if (fci->f->dd_fcrport_size)
2617                                         memset(rport->dd_data, 0,
2618                                                 fci->f->dd_fcrport_size);
2619
2620                                 /*
2621                                  * If we were not a target, cancel the
2622                                  * io terminate and rport timers, and
2623                                  * we're done.
2624                                  *
2625                                  * If we were a target, but our new role
2626                                  * doesn't indicate a target, leave the
2627                                  * timers running expecting the role to
2628                                  * change as the target fully logs in. If
2629                                  * it doesn't, the target will be torn down.
2630                                  *
2631                                  * If we were a target, and our role shows
2632                                  * we're still a target, cancel the timers
2633                                  * and kick off a scan.
2634                                  */
2635
2636                                 /* was a target, not in roles */
2637                                 if ((rport->scsi_target_id != -1) &&
2638                                     (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2639                                         return rport;
2640
2641                                 /*
2642                                  * Stop the fail io and dev_loss timers.
2643                                  * If they flush, the port_state will
2644                                  * be checked and will NOOP the function.
2645                                  */
2646                                 if (!cancel_delayed_work(&rport->fail_io_work))
2647                                         fc_flush_devloss(shost);
2648                                 if (!cancel_delayed_work(&rport->dev_loss_work))
2649                                         fc_flush_devloss(shost);
2650
2651                                 spin_lock_irqsave(shost->host_lock, flags);
2652
2653                                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2654                                                   FC_RPORT_DEVLOSS_PENDING |
2655                                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
2656
2657                                 /* if target, initiate a scan */
2658                                 if (rport->scsi_target_id != -1) {
2659                                         rport->flags |= FC_RPORT_SCAN_PENDING;
2660                                         scsi_queue_work(shost,
2661                                                         &rport->scan_work);
2662                                         spin_unlock_irqrestore(shost->host_lock,
2663                                                         flags);
2664                                         scsi_target_unblock(&rport->dev);
2665                                 } else
2666                                         spin_unlock_irqrestore(shost->host_lock,
2667                                                         flags);
2668
2669                                 return rport;
2670                         }
2671                 }
2672         }
2673
2674         /*
2675          * Search the bindings array
2676          * Note: if never a FCP target, you won't be on this list
2677          */
2678         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2679
2680                 /* search for a matching consistent binding */
2681
2682                 list_for_each_entry(rport, &fc_host->rport_bindings,
2683                                         peers) {
2684                         if (rport->channel != channel)
2685                                 continue;
2686
2687                         switch (fc_host->tgtid_bind_type) {
2688                         case FC_TGTID_BIND_BY_WWPN:
2689                                 if (rport->port_name == ids->port_name)
2690                                         match = 1;
2691                                 break;
2692                         case FC_TGTID_BIND_BY_WWNN:
2693                                 if (rport->node_name == ids->node_name)
2694                                         match = 1;
2695                                 break;
2696                         case FC_TGTID_BIND_BY_ID:
2697                                 if (rport->port_id == ids->port_id)
2698                                         match = 1;
2699                                 break;
2700                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2701                                 break;
2702                         }
2703
2704                         if (match) {
2705                                 list_move_tail(&rport->peers, &fc_host->rports);
2706                                 break;
2707                         }
2708                 }
2709
2710                 if (match) {
2711                         memcpy(&rport->node_name, &ids->node_name,
2712                                 sizeof(rport->node_name));
2713                         memcpy(&rport->port_name, &ids->port_name,
2714                                 sizeof(rport->port_name));
2715                         rport->port_id = ids->port_id;
2716                         rport->roles = ids->roles;
2717                         rport->port_state = FC_PORTSTATE_ONLINE;
2718                         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2719
2720                         if (fci->f->dd_fcrport_size)
2721                                 memset(rport->dd_data, 0,
2722                                                 fci->f->dd_fcrport_size);
2723
2724                         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2725                                 /* initiate a scan of the target */
2726                                 rport->flags |= FC_RPORT_SCAN_PENDING;
2727                                 scsi_queue_work(shost, &rport->scan_work);
2728                                 spin_unlock_irqrestore(shost->host_lock, flags);
2729                                 scsi_target_unblock(&rport->dev);
2730                         } else
2731                                 spin_unlock_irqrestore(shost->host_lock, flags);
2732
2733                         return rport;
2734                 }
2735         }
2736
2737         spin_unlock_irqrestore(shost->host_lock, flags);
2738
2739         /* No consistent binding found - create new remote port entry */
2740         rport = fc_rport_create(shost, channel, ids);
2741
2742         return rport;
2743 }
2744 EXPORT_SYMBOL(fc_remote_port_add);
2745
2746
2747 /**
2748  * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2749  * @rport:      The remote port that no longer exists
2750  *
2751  * The LLDD calls this routine to notify the transport that a remote
2752  * port is no longer part of the topology. Note: Although a port
2753  * may no longer be part of the topology, it may persist in the remote
2754  * ports displayed by the fc_host. We do this under 2 conditions:
2755  * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2756  *   This allows the port to temporarily disappear, then reappear without
2757  *   disrupting the SCSI device tree attached to it. During the "blocked"
2758  *   period the port will still exist.
2759  * 2) If the port was a scsi target and disappears for longer than we
2760  *   expect, we'll delete the port and the tear down the SCSI device tree
2761  *   attached to it. However, we want to semi-persist the target id assigned
2762  *   to that port if it eventually does exist. The port structure will
2763  *   remain (although with minimal information) so that the target id
2764  *   bindings remails.
2765  *
2766  * If the remote port is not an FCP Target, it will be fully torn down
2767  * and deallocated, including the fc_remote_port class device.
2768  *
2769  * If the remote port is an FCP Target, the port will be placed in a
2770  * temporary blocked state. From the LLDD's perspective, the rport no
2771  * longer exists. From the SCSI midlayer's perspective, the SCSI target
2772  * exists, but all sdevs on it are blocked from further I/O. The following
2773  * is then expected.
2774  *
2775  *   If the remote port does not return (signaled by a LLDD call to
2776  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2777  *   scsi target is removed - killing all outstanding i/o and removing the
2778  *   scsi devices attached ot it. The port structure will be marked Not
2779  *   Present and be partially cleared, leaving only enough information to
2780  *   recognize the remote port relative to the scsi target id binding if
2781  *   it later appears.  The port will remain as long as there is a valid
2782  *   binding (e.g. until the user changes the binding type or unloads the
2783  *   scsi host with the binding).
2784  *
2785  *   If the remote port returns within the dev_loss_tmo value (and matches
2786  *   according to the target id binding type), the port structure will be
2787  *   reused. If it is no longer a SCSI target, the target will be torn
2788  *   down. If it continues to be a SCSI target, then the target will be
2789  *   unblocked (allowing i/o to be resumed), and a scan will be activated
2790  *   to ensure that all luns are detected.
2791  *
2792  * Called from normal process context only - cannot be called from interrupt.
2793  *
2794  * Notes:
2795  *      This routine assumes no locks are held on entry.
2796  */
2797 void
2798 fc_remote_port_delete(struct fc_rport  *rport)
2799 {
2800         struct Scsi_Host *shost = rport_to_shost(rport);
2801         int timeout = rport->dev_loss_tmo;
2802         unsigned long flags;
2803
2804         /*
2805          * No need to flush the fc_host work_q's, as all adds are synchronous.
2806          *
2807          * We do need to reclaim the rport scan work element, so eventually
2808          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2809          * there's still a scan pending.
2810          */
2811
2812         spin_lock_irqsave(shost->host_lock, flags);
2813
2814         if (rport->port_state != FC_PORTSTATE_ONLINE) {
2815                 spin_unlock_irqrestore(shost->host_lock, flags);
2816                 return;
2817         }
2818
2819         /*
2820          * In the past, we if this was not an FCP-Target, we would
2821          * unconditionally just jump to deleting the rport.
2822          * However, rports can be used as node containers by the LLDD,
2823          * and its not appropriate to just terminate the rport at the
2824          * first sign of a loss in connectivity. The LLDD may want to
2825          * send ELS traffic to re-validate the login. If the rport is
2826          * immediately deleted, it makes it inappropriate for a node
2827          * container.
2828          * So... we now unconditionally wait dev_loss_tmo before
2829          * destroying an rport.
2830          */
2831
2832         rport->port_state = FC_PORTSTATE_BLOCKED;
2833
2834         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2835
2836         spin_unlock_irqrestore(shost->host_lock, flags);
2837
2838         if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2839             shost->active_mode & MODE_TARGET)
2840                 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2841
2842         scsi_target_block(&rport->dev);
2843
2844         /* see if we need to kill io faster than waiting for device loss */
2845         if ((rport->fast_io_fail_tmo != -1) &&
2846             (rport->fast_io_fail_tmo < timeout))
2847                 fc_queue_devloss_work(shost, &rport->fail_io_work,
2848                                         rport->fast_io_fail_tmo * HZ);
2849
2850         /* cap the length the devices can be blocked until they are deleted */
2851         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2852 }
2853 EXPORT_SYMBOL(fc_remote_port_delete);
2854
2855 /**
2856  * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
2857  * @rport:      The remote port that changed.
2858  * @roles:      New roles for this port.
2859  *
2860  * Description: The LLDD calls this routine to notify the transport that the
2861  * roles on a remote port may have changed. The largest effect of this is
2862  * if a port now becomes a FCP Target, it must be allocated a
2863  * scsi target id.  If the port is no longer a FCP target, any
2864  * scsi target id value assigned to it will persist in case the
2865  * role changes back to include FCP Target. No changes in the scsi
2866  * midlayer will be invoked if the role changes (in the expectation
2867  * that the role will be resumed. If it doesn't normal error processing
2868  * will take place).
2869  *
2870  * Should not be called from interrupt context.
2871  *
2872  * Notes:
2873  *      This routine assumes no locks are held on entry.
2874  */
2875 void
2876 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
2877 {
2878         struct Scsi_Host *shost = rport_to_shost(rport);
2879         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2880         unsigned long flags;
2881         int create = 0;
2882         int ret;
2883
2884         spin_lock_irqsave(shost->host_lock, flags);
2885         if (roles & FC_PORT_ROLE_FCP_TARGET) {
2886                 if (rport->scsi_target_id == -1) {
2887                         rport->scsi_target_id = fc_host->next_target_id++;
2888                         create = 1;
2889                 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
2890                         create = 1;
2891         } else if (shost->active_mode & MODE_TARGET) {
2892                 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
2893                                              (char *)&rport->node_name);
2894                 if (ret)
2895                         printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
2896                                ret);
2897         }
2898
2899         rport->roles = roles;
2900
2901         spin_unlock_irqrestore(shost->host_lock, flags);
2902
2903         if (create) {
2904                 /*
2905                  * There may have been a delete timer running on the
2906                  * port. Ensure that it is cancelled as we now know
2907                  * the port is an FCP Target.
2908                  * Note: we know the rport is exists and in an online
2909                  *  state as the LLDD would not have had an rport
2910                  *  reference to pass us.
2911                  *
2912                  * Take no action on the del_timer failure as the state
2913                  * machine state change will validate the
2914                  * transaction.
2915                  */
2916                 if (!cancel_delayed_work(&rport->fail_io_work))
2917                         fc_flush_devloss(shost);
2918                 if (!cancel_delayed_work(&rport->dev_loss_work))
2919                         fc_flush_devloss(shost);
2920
2921                 spin_lock_irqsave(shost->host_lock, flags);
2922                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2923                                   FC_RPORT_DEVLOSS_PENDING);
2924                 spin_unlock_irqrestore(shost->host_lock, flags);
2925
2926                 /* ensure any stgt delete functions are done */
2927                 fc_flush_work(shost);
2928
2929                 /* initiate a scan of the target */
2930                 spin_lock_irqsave(shost->host_lock, flags);
2931                 rport->flags |= FC_RPORT_SCAN_PENDING;
2932                 scsi_queue_work(shost, &rport->scan_work);
2933                 spin_unlock_irqrestore(shost->host_lock, flags);
2934                 scsi_target_unblock(&rport->dev);
2935         }
2936 }
2937 EXPORT_SYMBOL(fc_remote_port_rolechg);
2938
2939 /**
2940  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
2941  * @work:       rport target that failed to reappear in the allotted time.
2942  *
2943  * Description: An attempt to delete a remote port blocks, and if it fails
2944  *              to return in the allotted time this gets called.
2945  */
2946 static void
2947 fc_timeout_deleted_rport(struct work_struct *work)
2948 {
2949         struct fc_rport *rport =
2950                 container_of(work, struct fc_rport, dev_loss_work.work);
2951         struct Scsi_Host *shost = rport_to_shost(rport);
2952         struct fc_internal *i = to_fc_internal(shost->transportt);
2953         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2954         unsigned long flags;
2955
2956         spin_lock_irqsave(shost->host_lock, flags);
2957
2958         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2959
2960         /*
2961          * If the port is ONLINE, then it came back. If it was a SCSI
2962          * target, validate it still is. If not, tear down the
2963          * scsi_target on it.
2964          */
2965         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
2966             (rport->scsi_target_id != -1) &&
2967             !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
2968                 dev_printk(KERN_ERR, &rport->dev,
2969                         "blocked FC remote port time out: no longer"
2970                         " a FCP target, removing starget\n");
2971                 spin_unlock_irqrestore(shost->host_lock, flags);
2972                 scsi_target_unblock(&rport->dev);
2973                 fc_queue_work(shost, &rport->stgt_delete_work);
2974                 return;
2975         }
2976
2977         /* NOOP state - we're flushing workq's */
2978         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
2979                 spin_unlock_irqrestore(shost->host_lock, flags);
2980                 dev_printk(KERN_ERR, &rport->dev,
2981                         "blocked FC remote port time out: leaving"
2982                         " rport%s alone\n",
2983                         (rport->scsi_target_id != -1) ?  " and starget" : "");
2984                 return;
2985         }
2986
2987         if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
2988             (rport->scsi_target_id == -1)) {
2989                 list_del(&rport->peers);
2990                 rport->port_state = FC_PORTSTATE_DELETED;
2991                 dev_printk(KERN_ERR, &rport->dev,
2992                         "blocked FC remote port time out: removing"
2993                         " rport%s\n",
2994                         (rport->scsi_target_id != -1) ?  " and starget" : "");
2995                 fc_queue_work(shost, &rport->rport_delete_work);
2996                 spin_unlock_irqrestore(shost->host_lock, flags);
2997                 return;
2998         }
2999
3000         dev_printk(KERN_ERR, &rport->dev,
3001                 "blocked FC remote port time out: removing target and "
3002                 "saving binding\n");
3003
3004         list_move_tail(&rport->peers, &fc_host->rport_bindings);
3005
3006         /*
3007          * Note: We do not remove or clear the hostdata area. This allows
3008          *   host-specific target data to persist along with the
3009          *   scsi_target_id. It's up to the host to manage it's hostdata area.
3010          */
3011
3012         /*
3013          * Reinitialize port attributes that may change if the port comes back.
3014          */
3015         rport->maxframe_size = -1;
3016         rport->supported_classes = FC_COS_UNSPECIFIED;
3017         rport->roles = FC_PORT_ROLE_UNKNOWN;
3018         rport->port_state = FC_PORTSTATE_NOTPRESENT;
3019         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3020         rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3021
3022         /*
3023          * Pre-emptively kill I/O rather than waiting for the work queue
3024          * item to teardown the starget. (FCOE libFC folks prefer this
3025          * and to have the rport_port_id still set when it's done).
3026          */
3027         spin_unlock_irqrestore(shost->host_lock, flags);
3028         fc_terminate_rport_io(rport);
3029
3030         BUG_ON(rport->port_state != FC_PORTSTATE_NOTPRESENT);
3031
3032         /* remove the identifiers that aren't used in the consisting binding */
3033         switch (fc_host->tgtid_bind_type) {
3034         case FC_TGTID_BIND_BY_WWPN:
3035                 rport->node_name = -1;
3036                 rport->port_id = -1;
3037                 break;
3038         case FC_TGTID_BIND_BY_WWNN:
3039                 rport->port_name = -1;
3040                 rport->port_id = -1;
3041                 break;
3042         case FC_TGTID_BIND_BY_ID:
3043                 rport->node_name = -1;
3044                 rport->port_name = -1;
3045                 break;
3046         case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
3047                 break;
3048         }
3049
3050         /*
3051          * As this only occurs if the remote port (scsi target)
3052          * went away and didn't come back - we'll remove
3053          * all attached scsi devices.
3054          */
3055         fc_queue_work(shost, &rport->stgt_delete_work);
3056
3057         /*
3058          * Notify the driver that the rport is now dead. The LLDD will
3059          * also guarantee that any communication to the rport is terminated
3060          *
3061          * Note: we set the CALLBK_DONE flag above to correspond
3062          */
3063         if (i->f->dev_loss_tmo_callbk)
3064                 i->f->dev_loss_tmo_callbk(rport);
3065 }
3066
3067
3068 /**
3069  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3070  * @work:       rport to terminate io on.
3071  *
3072  * Notes: Only requests the failure of the io, not that all are flushed
3073  *    prior to returning.
3074  */
3075 static void
3076 fc_timeout_fail_rport_io(struct work_struct *work)
3077 {
3078         struct fc_rport *rport =
3079                 container_of(work, struct fc_rport, fail_io_work.work);
3080
3081         if (rport->port_state != FC_PORTSTATE_BLOCKED)
3082                 return;
3083
3084         rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3085         fc_terminate_rport_io(rport);
3086 }
3087
3088 /**
3089  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3090  * @work:       remote port to be scanned.
3091  */
3092 static void
3093 fc_scsi_scan_rport(struct work_struct *work)
3094 {
3095         struct fc_rport *rport =
3096                 container_of(work, struct fc_rport, scan_work);
3097         struct Scsi_Host *shost = rport_to_shost(rport);
3098         struct fc_internal *i = to_fc_internal(shost->transportt);
3099         unsigned long flags;
3100
3101         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3102             (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3103             !(i->f->disable_target_scan)) {
3104                 scsi_scan_target(&rport->dev, rport->channel,
3105                         rport->scsi_target_id, SCAN_WILD_CARD, 1);
3106         }
3107
3108         spin_lock_irqsave(shost->host_lock, flags);
3109         rport->flags &= ~FC_RPORT_SCAN_PENDING;
3110         spin_unlock_irqrestore(shost->host_lock, flags);
3111 }
3112
3113
3114 /**
3115  * fc_vport_setup - allocates and creates a FC virtual port.
3116  * @shost:      scsi host the virtual port is connected to.
3117  * @channel:    Channel on shost port connected to.
3118  * @pdev:       parent device for vport
3119  * @ids:        The world wide names, FC4 port roles, etc for
3120  *              the virtual port.
3121  * @ret_vport:  The pointer to the created vport.
3122  *
3123  * Allocates and creates the vport structure, calls the parent host
3124  * to instantiate the vport, the completes w/ class and sysfs creation.
3125  *
3126  * Notes:
3127  *      This routine assumes no locks are held on entry.
3128  */
3129 static int
3130 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3131         struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
3132 {
3133         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3134         struct fc_internal *fci = to_fc_internal(shost->transportt);
3135         struct fc_vport *vport;
3136         struct device *dev;
3137         unsigned long flags;
3138         size_t size;
3139         int error;
3140
3141         *ret_vport = NULL;
3142
3143         if ( ! fci->f->vport_create)
3144                 return -ENOENT;
3145
3146         size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3147         vport = kzalloc(size, GFP_KERNEL);
3148         if (unlikely(!vport)) {
3149                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3150                 return -ENOMEM;
3151         }
3152
3153         vport->vport_state = FC_VPORT_UNKNOWN;
3154         vport->vport_last_state = FC_VPORT_UNKNOWN;
3155         vport->node_name = ids->node_name;
3156         vport->port_name = ids->port_name;
3157         vport->roles = ids->roles;
3158         vport->vport_type = ids->vport_type;
3159         if (fci->f->dd_fcvport_size)
3160                 vport->dd_data = &vport[1];
3161         vport->shost = shost;
3162         vport->channel = channel;
3163         vport->flags = FC_VPORT_CREATING;
3164         INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3165
3166         spin_lock_irqsave(shost->host_lock, flags);
3167
3168         if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3169                 spin_unlock_irqrestore(shost->host_lock, flags);
3170                 kfree(vport);
3171                 return -ENOSPC;
3172         }
3173         fc_host->npiv_vports_inuse++;
3174         vport->number = fc_host->next_vport_number++;
3175         list_add_tail(&vport->peers, &fc_host->vports);
3176         get_device(&shost->shost_gendev);       /* for fc_host->vport list */
3177
3178         spin_unlock_irqrestore(shost->host_lock, flags);
3179
3180         dev = &vport->dev;
3181         device_initialize(dev);                 /* takes self reference */
3182         dev->parent = get_device(pdev);         /* takes parent reference */
3183         dev->release = fc_vport_dev_release;
3184         dev_set_name(dev, "vport-%d:%d-%d",
3185                      shost->host_no, channel, vport->number);
3186         transport_setup_device(dev);
3187
3188         error = device_add(dev);
3189         if (error) {
3190                 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3191                 goto delete_vport;
3192         }
3193         transport_add_device(dev);
3194         transport_configure_device(dev);
3195
3196         error = fci->f->vport_create(vport, ids->disable);
3197         if (error) {
3198                 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3199                 goto delete_vport_all;
3200         }
3201
3202         /*
3203          * if the parent isn't the physical adapter's Scsi_Host, ensure
3204          * the Scsi_Host at least contains ia symlink to the vport.
3205          */
3206         if (pdev != &shost->shost_gendev) {
3207                 error = sysfs_create_link(&shost->shost_gendev.kobj,
3208                                  &dev->kobj, dev_name(dev));
3209                 if (error)
3210                         printk(KERN_ERR
3211                                 "%s: Cannot create vport symlinks for "
3212                                 "%s, err=%d\n",
3213                                 __func__, dev_name(dev), error);
3214         }
3215         spin_lock_irqsave(shost->host_lock, flags);
3216         vport->flags &= ~FC_VPORT_CREATING;
3217         spin_unlock_irqrestore(shost->host_lock, flags);
3218
3219         dev_printk(KERN_NOTICE, pdev,
3220                         "%s created via shost%d channel %d\n", dev_name(dev),
3221                         shost->host_no, channel);
3222
3223         *ret_vport = vport;
3224
3225         return 0;
3226
3227 delete_vport_all:
3228         transport_remove_device(dev);
3229         device_del(dev);
3230 delete_vport:
3231         transport_destroy_device(dev);
3232         spin_lock_irqsave(shost->host_lock, flags);
3233         list_del(&vport->peers);
3234         put_device(&shost->shost_gendev);       /* for fc_host->vport list */
3235         fc_host->npiv_vports_inuse--;
3236         spin_unlock_irqrestore(shost->host_lock, flags);
3237         put_device(dev->parent);
3238         kfree(vport);
3239
3240         return error;
3241 }
3242
3243 /**
3244  * fc_vport_create - Admin App or LLDD requests creation of a vport
3245  * @shost:      scsi host the virtual port is connected to.
3246  * @channel:    channel on shost port connected to.
3247  * @ids:        The world wide names, FC4 port roles, etc for
3248  *              the virtual port.
3249  *
3250  * Notes:
3251  *      This routine assumes no locks are held on entry.
3252  */
3253 struct fc_vport *
3254 fc_vport_create(struct Scsi_Host *shost, int channel,
3255         struct fc_vport_identifiers *ids)
3256 {
3257         int stat;
3258         struct fc_vport *vport;
3259
3260         stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3261                  ids, &vport);
3262         return stat ? NULL : vport;
3263 }
3264 EXPORT_SYMBOL(fc_vport_create);
3265
3266 /**
3267  * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3268  * @vport:      fc_vport to be terminated
3269  *
3270  * Calls the LLDD vport_delete() function, then deallocates and removes
3271  * the vport from the shost and object tree.
3272  *
3273  * Notes:
3274  *      This routine assumes no locks are held on entry.
3275  */
3276 int
3277 fc_vport_terminate(struct fc_vport *vport)
3278 {
3279         struct Scsi_Host *shost = vport_to_shost(vport);
3280         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3281         struct fc_internal *i = to_fc_internal(shost->transportt);
3282         struct device *dev = &vport->dev;
3283         unsigned long flags;
3284         int stat;
3285
3286         spin_lock_irqsave(shost->host_lock, flags);
3287         if (vport->flags & FC_VPORT_CREATING) {
3288                 spin_unlock_irqrestore(shost->host_lock, flags);
3289                 return -EBUSY;
3290         }
3291         if (vport->flags & (FC_VPORT_DEL)) {
3292                 spin_unlock_irqrestore(shost->host_lock, flags);
3293                 return -EALREADY;
3294         }
3295         vport->flags |= FC_VPORT_DELETING;
3296         spin_unlock_irqrestore(shost->host_lock, flags);
3297
3298         if (i->f->vport_delete)
3299                 stat = i->f->vport_delete(vport);
3300         else
3301                 stat = -ENOENT;
3302
3303         spin_lock_irqsave(shost->host_lock, flags);
3304         vport->flags &= ~FC_VPORT_DELETING;
3305         if (!stat) {
3306                 vport->flags |= FC_VPORT_DELETED;
3307                 list_del(&vport->peers);
3308                 fc_host->npiv_vports_inuse--;
3309                 put_device(&shost->shost_gendev);  /* for fc_host->vport list */
3310         }
3311         spin_unlock_irqrestore(shost->host_lock, flags);
3312
3313         if (stat)
3314                 return stat;
3315
3316         if (dev->parent != &shost->shost_gendev)
3317                 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3318         transport_remove_device(dev);
3319         device_del(dev);
3320         transport_destroy_device(dev);
3321
3322         /*
3323          * Removing our self-reference should mean our
3324          * release function gets called, which will drop the remaining
3325          * parent reference and free the data structure.
3326          */
3327         put_device(dev);                        /* for self-reference */
3328
3329         return 0; /* SUCCESS */
3330 }
3331 EXPORT_SYMBOL(fc_vport_terminate);
3332
3333 /**
3334  * fc_vport_sched_delete - workq-based delete request for a vport
3335  * @work:       vport to be deleted.
3336  */
3337 static void
3338 fc_vport_sched_delete(struct work_struct *work)
3339 {
3340         struct fc_vport *vport =
3341                 container_of(work, struct fc_vport, vport_delete_work);
3342         int stat;
3343
3344         stat = fc_vport_terminate(vport);
3345         if (stat)
3346                 dev_printk(KERN_ERR, vport->dev.parent,
3347                         "%s: %s could not be deleted created via "
3348                         "shost%d channel %d - error %d\n", __func__,
3349                         dev_name(&vport->dev), vport->shost->host_no,
3350                         vport->channel, stat);
3351 }
3352
3353
3354 /* Original Author:  Martin Hicks */
3355 MODULE_AUTHOR("James Smart");
3356 MODULE_DESCRIPTION("FC Transport Attributes");
3357 MODULE_LICENSE("GPL");
3358
3359 module_init(fc_transport_init);
3360 module_exit(fc_transport_exit);