drivers/scsi/scsi_transport_fc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  FiberChannel transport specific attributes exported to sysfs.
   4  *
   5  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   6  *  Copyright (C) 2004-2007   James Smart, Emulex Corporation
   7  *    Rewrite for host, target, device, and remote port attributes,
   8  *    statistics, and service functions...
   9  *    Add vports, etc
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/slab.h>
  14 #include <linux/delay.h>
  15 #include <linux/kernel.h>
  16 #include <linux/bsg-lib.h>
  17 #include <scsi/scsi_device.h>
  18 #include <scsi/scsi_host.h>
  19 #include <scsi/scsi_transport.h>
  20 #include <scsi/scsi_transport_fc.h>
  21 #include <scsi/scsi_cmnd.h>
  22 #include <net/netlink.h>
  23 #include <scsi/scsi_netlink_fc.h>
  24 #include <scsi/scsi_bsg_fc.h>
  25 #include <uapi/scsi/fc/fc_els.h>
  26 #include "scsi_priv.h"
  27
  28 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  29 static void fc_vport_sched_delete(struct work_struct *work);
  30 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
  31         struct device *pdev, struct fc_vport_identifiers  *ids,
  32         struct fc_vport **vport);
  33 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
  34 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
  35 static void fc_bsg_remove(struct request_queue *);
  36 static void fc_bsg_goose_queue(struct fc_rport *);
  37 static void fc_li_stats_update(struct fc_fn_li_desc *li_desc,
  38                                struct fc_fpin_stats *stats);
  39 static void fc_delivery_stats_update(u32 reason_code,
  40                                      struct fc_fpin_stats *stats);
  41 static void fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats);
  42
  43 /*
  44  * Module Parameters
  45  */
  46
  47 /*
  48  * dev_loss_tmo: the default number of seconds that the FC transport
  49  *   should insulate the loss of a remote port.
  50  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
  51  */
  52 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
  53
  54 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
  55 MODULE_PARM_DESC(dev_loss_tmo,
  56                  "Maximum number of seconds that the FC transport should"
  57                  " insulate the loss of a remote port. Once this value is"
  58                  " exceeded, the scsi target is removed. Value should be"
  59                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
  60                  " fast_io_fail_tmo is not set.");
  61
  62 /*
  63  * Redefine so that we can have same named attributes in the
  64  * sdev/starget/host objects.
  65  */
  66 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)                \
  67 struct device_attribute device_attr_##_prefix##_##_name =       \
  68         __ATTR(_name,_mode,_show,_store)
  69
  70 #define fc_enum_name_search(title, table_type, table)                   \
  71 static const char *get_fc_##title##_name(enum table_type table_key)     \
  72 {                                                                       \
  73         int i;                                                          \
  74         char *name = NULL;                                              \
  75                                                                         \
  76         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  77                 if (table[i].value == table_key) {                      \
  78                         name = table[i].name;                           \
  79                         break;                                          \
  80                 }                                                       \
  81         }                                                               \
  82         return name;                                                    \
  83 }
  84
  85 #define fc_enum_name_match(title, table_type, table)                    \
  86 static int get_fc_##title##_match(const char *table_key,                \
  87                 enum table_type *value)                                 \
  88 {                                                                       \
  89         int i;                                                          \
  90                                                                         \
  91         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  92                 if (strncmp(table_key, table[i].name,                   \
  93                                 table[i].matchlen) == 0) {              \
  94                         *value = table[i].value;                        \
  95                         return 0; /* success */                         \
  96                 }                                                       \
  97         }                                                               \
  98         return 1; /* failure */                                         \
  99 }
 100
 101
 102 /* Convert fc_port_type values to ascii string name */
 103 static struct {
 104         enum fc_port_type       value;
 105         char                    *name;
 106 } fc_port_type_names[] = {
 107         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
 108         { FC_PORTTYPE_OTHER,            "Other" },
 109         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
 110         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
 111         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
 112         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
 113         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection)" },
 114         { FC_PORTTYPE_NPIV,             "NPIV VPORT" },
 115 };
 116 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
 117 #define FC_PORTTYPE_MAX_NAMELEN         50
 118
 119 /* Reuse fc_port_type enum function for vport_type */
 120 #define get_fc_vport_type_name get_fc_port_type_name
 121
 122
 123 /* Convert fc_host_event_code values to ascii string name */
 124 static const struct {
 125         enum fc_host_event_code         value;
 126         char                            *name;
 127 } fc_host_event_code_names[] = {
 128         { FCH_EVT_LIP,                  "lip" },
 129         { FCH_EVT_LINKUP,               "link_up" },
 130         { FCH_EVT_LINKDOWN,             "link_down" },
 131         { FCH_EVT_LIPRESET,             "lip_reset" },
 132         { FCH_EVT_RSCN,                 "rscn" },
 133         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
 134         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
 135         { FCH_EVT_PORT_ONLINE,          "port_online" },
 136         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
 137         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
 138         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
 139         { FCH_EVT_LINK_FPIN,            "link_FPIN" },
 140         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
 141 };
 142 fc_enum_name_search(host_event_code, fc_host_event_code,
 143                 fc_host_event_code_names)
 144 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
 145
 146
 147 /* Convert fc_port_state values to ascii string name */
 148 static struct {
 149         enum fc_port_state      value;
 150         char                    *name;
 151         int                     matchlen;
 152 } fc_port_state_names[] = {
 153         { FC_PORTSTATE_UNKNOWN,         "Unknown", 7},
 154         { FC_PORTSTATE_NOTPRESENT,      "Not Present", 11 },
 155         { FC_PORTSTATE_ONLINE,          "Online", 6 },
 156         { FC_PORTSTATE_OFFLINE,         "Offline", 7 },
 157         { FC_PORTSTATE_BLOCKED,         "Blocked", 7 },
 158         { FC_PORTSTATE_BYPASSED,        "Bypassed", 8 },
 159         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics", 11 },
 160         { FC_PORTSTATE_LINKDOWN,        "Linkdown", 8 },
 161         { FC_PORTSTATE_ERROR,           "Error", 5 },
 162         { FC_PORTSTATE_LOOPBACK,        "Loopback", 8 },
 163         { FC_PORTSTATE_DELETED,         "Deleted", 7 },
 164         { FC_PORTSTATE_MARGINAL,        "Marginal", 8 },
 165 };
 166 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 167 fc_enum_name_match(port_state, fc_port_state, fc_port_state_names)
 168 #define FC_PORTSTATE_MAX_NAMELEN        20
 169
 170
 171 /* Convert fc_vport_state values to ascii string name */
 172 static struct {
 173         enum fc_vport_state     value;
 174         char                    *name;
 175 } fc_vport_state_names[] = {
 176         { FC_VPORT_UNKNOWN,             "Unknown" },
 177         { FC_VPORT_ACTIVE,              "Active" },
 178         { FC_VPORT_DISABLED,            "Disabled" },
 179         { FC_VPORT_LINKDOWN,            "Linkdown" },
 180         { FC_VPORT_INITIALIZING,        "Initializing" },
 181         { FC_VPORT_NO_FABRIC_SUPP,      "No Fabric Support" },
 182         { FC_VPORT_NO_FABRIC_RSCS,      "No Fabric Resources" },
 183         { FC_VPORT_FABRIC_LOGOUT,       "Fabric Logout" },
 184         { FC_VPORT_FABRIC_REJ_WWN,      "Fabric Rejected WWN" },
 185         { FC_VPORT_FAILED,              "VPort Failed" },
 186 };
 187 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
 188 #define FC_VPORTSTATE_MAX_NAMELEN       24
 189
 190 /* Reuse fc_vport_state enum function for vport_last_state */
 191 #define get_fc_vport_last_state_name get_fc_vport_state_name
 192
 193
 194 /* Convert fc_tgtid_binding_type values to ascii string name */
 195 static const struct {
 196         enum fc_tgtid_binding_type      value;
 197         char                            *name;
 198         int                             matchlen;
 199 } fc_tgtid_binding_type_names[] = {
 200         { FC_TGTID_BIND_NONE, "none", 4 },
 201         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 202         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 203         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 204 };
 205 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 206                 fc_tgtid_binding_type_names)
 207 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 208                 fc_tgtid_binding_type_names)
 209 #define FC_BINDTYPE_MAX_NAMELEN 30
 210
 211
 212 #define fc_bitfield_name_search(title, table)                   \
 213 static ssize_t                                                  \
 214 get_fc_##title##_names(u32 table_key, char *buf)                \
 215 {                                                               \
 216         char *prefix = "";                                      \
 217         ssize_t len = 0;                                        \
 218         int i;                                                  \
 219                                                                 \
 220         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 221                 if (table[i].value & table_key) {               \
 222                         len += sprintf(buf + len, "%s%s",       \
 223                                 prefix, table[i].name);         \
 224                         prefix = ", ";                          \
 225                 }                                               \
 226         }                                                       \
 227         len += sprintf(buf + len, "\n");                        \
 228         return len;                                             \
 229 }
 230
 231
 232 /* Convert FC_COS bit values to ascii string name */
 233 static const struct {
 234         u32                     value;
 235         char                    *name;
 236 } fc_cos_names[] = {
 237         { FC_COS_CLASS1,        "Class 1" },
 238         { FC_COS_CLASS2,        "Class 2" },
 239         { FC_COS_CLASS3,        "Class 3" },
 240         { FC_COS_CLASS4,        "Class 4" },
 241         { FC_COS_CLASS6,        "Class 6" },
 242 };
 243 fc_bitfield_name_search(cos, fc_cos_names)
 244
 245
 246 /* Convert FC_PORTSPEED bit values to ascii string name */
 247 static const struct {
 248         u32                     value;
 249         char                    *name;
 250 } fc_port_speed_names[] = {
 251         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 252         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 253         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 254         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 255         { FC_PORTSPEED_8GBIT,           "8 Gbit" },
 256         { FC_PORTSPEED_16GBIT,          "16 Gbit" },
 257         { FC_PORTSPEED_32GBIT,          "32 Gbit" },
 258         { FC_PORTSPEED_20GBIT,          "20 Gbit" },
 259         { FC_PORTSPEED_40GBIT,          "40 Gbit" },
 260         { FC_PORTSPEED_50GBIT,          "50 Gbit" },
 261         { FC_PORTSPEED_100GBIT,         "100 Gbit" },
 262         { FC_PORTSPEED_25GBIT,          "25 Gbit" },
 263         { FC_PORTSPEED_64GBIT,          "64 Gbit" },
 264         { FC_PORTSPEED_128GBIT,         "128 Gbit" },
 265         { FC_PORTSPEED_256GBIT,         "256 Gbit" },
 266         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 267 };
 268 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 269
 270
 271 static int
 272 show_fc_fc4s (char *buf, u8 *fc4_list)
 273 {
 274         int i, len=0;
 275
 276         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 277                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 278         len += sprintf(buf + len, "\n");
 279         return len;
 280 }
 281
 282
 283 /* Convert FC_PORT_ROLE bit values to ascii string name */
 284 static const struct {
 285         u32                     value;
 286         char                    *name;
 287 } fc_port_role_names[] = {
 288         { FC_PORT_ROLE_FCP_TARGET,              "FCP Target" },
 289         { FC_PORT_ROLE_FCP_INITIATOR,           "FCP Initiator" },
 290         { FC_PORT_ROLE_IP_PORT,                 "IP Port" },
 291         { FC_PORT_ROLE_FCP_DUMMY_INITIATOR,     "FCP Dummy Initiator" },
 292         { FC_PORT_ROLE_NVME_INITIATOR,          "NVMe Initiator" },
 293         { FC_PORT_ROLE_NVME_TARGET,             "NVMe Target" },
 294         { FC_PORT_ROLE_NVME_DISCOVERY,          "NVMe Discovery" },
 295 };
 296 fc_bitfield_name_search(port_roles, fc_port_role_names)
 297
 298 /*
 299  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 300  */
 301 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 302 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 303 #define FC_FPORT_PORTID                 0x00000e
 304 #define FC_FABCTLR_PORTID               0x00000d
 305 #define FC_DIRSRVR_PORTID               0x00000c
 306 #define FC_TIMESRVR_PORTID              0x00000b
 307 #define FC_MGMTSRVR_PORTID              0x00000a
 308
 309
 310 static void fc_timeout_deleted_rport(struct work_struct *work);
 311 static void fc_timeout_fail_rport_io(struct work_struct *work);
 312 static void fc_scsi_scan_rport(struct work_struct *work);
 313
 314 /*
 315  * Attribute counts pre object type...
 316  * Increase these values if you add attributes
 317  */
 318 #define FC_STARGET_NUM_ATTRS    3
 319 #define FC_RPORT_NUM_ATTRS      10
 320 #define FC_VPORT_NUM_ATTRS      9
 321 #define FC_HOST_NUM_ATTRS       29
 322
 323 struct fc_internal {
 324         struct scsi_transport_template t;
 325         struct fc_function_template *f;
 326
 327         /*
 328          * For attributes : each object has :
 329          *   An array of the actual attributes structures
 330          *   An array of null-terminated pointers to the attribute
 331          *     structures - used for mid-layer interaction.
 332          *
 333          * The attribute containers for the starget and host are are
 334          * part of the midlayer. As the remote port is specific to the
 335          * fc transport, we must provide the attribute container.
 336          */
 337         struct device_attribute private_starget_attrs[
 338                                                         FC_STARGET_NUM_ATTRS];
 339         struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 340
 341         struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 342         struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 343
 344         struct transport_container rport_attr_cont;
 345         struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 346         struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 347
 348         struct transport_container vport_attr_cont;
 349         struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
 350         struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
 351 };
 352
 353 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 354
 355 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 356                            struct device *cdev)
 357 {
 358         struct scsi_target *starget = to_scsi_target(dev);
 359         struct fc_rport *rport = starget_to_rport(starget);
 360
 361         /*
 362          * if parent is remote port, use values from remote port.
 363          * Otherwise, this host uses the fc_transport, but not the
 364          * remote port interface. As such, initialize to known non-values.
 365          */
 366         if (rport) {
 367                 fc_starget_node_name(starget) = rport->node_name;
 368                 fc_starget_port_name(starget) = rport->port_name;
 369                 fc_starget_port_id(starget) = rport->port_id;
 370         } else {
 371                 fc_starget_node_name(starget) = -1;
 372                 fc_starget_port_name(starget) = -1;
 373                 fc_starget_port_id(starget) = -1;
 374         }
 375
 376         return 0;
 377 }
 378
 379 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 380                                "fc_transport",
 381                                fc_target_setup,
 382                                NULL,
 383                                NULL);
 384
 385 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 386                          struct device *cdev)
 387 {
 388         struct Scsi_Host *shost = dev_to_shost(dev);
 389         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 390
 391         /*
 392          * Set default values easily detected by the midlayer as
 393          * failure cases.  The scsi lldd is responsible for initializing
 394          * all transport attributes to valid values per host.
 395          */
 396         fc_host->node_name = -1;
 397         fc_host->port_name = -1;
 398         fc_host->permanent_port_name = -1;
 399         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 400         memset(fc_host->supported_fc4s, 0,
 401                 sizeof(fc_host->supported_fc4s));
 402         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 403         fc_host->maxframe_size = -1;
 404         fc_host->max_npiv_vports = 0;
 405         memset(fc_host->serial_number, 0,
 406                 sizeof(fc_host->serial_number));
 407         memset(fc_host->manufacturer, 0,
 408                 sizeof(fc_host->manufacturer));
 409         memset(fc_host->model, 0,
 410                 sizeof(fc_host->model));
 411         memset(fc_host->model_description, 0,
 412                 sizeof(fc_host->model_description));
 413         memset(fc_host->hardware_version, 0,
 414                 sizeof(fc_host->hardware_version));
 415         memset(fc_host->driver_version, 0,
 416                 sizeof(fc_host->driver_version));
 417         memset(fc_host->firmware_version, 0,
 418                 sizeof(fc_host->firmware_version));
 419         memset(fc_host->optionrom_version, 0,
 420                 sizeof(fc_host->optionrom_version));
 421
 422         fc_host->port_id = -1;
 423         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 424         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 425         memset(fc_host->active_fc4s, 0,
 426                 sizeof(fc_host->active_fc4s));
 427         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 428         fc_host->fabric_name = -1;
 429         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 430         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
 431         memset(&fc_host->fpin_stats, 0, sizeof(fc_host->fpin_stats));
 432
 433         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 434
 435         INIT_LIST_HEAD(&fc_host->rports);
 436         INIT_LIST_HEAD(&fc_host->rport_bindings);
 437         INIT_LIST_HEAD(&fc_host->vports);
 438         fc_host->next_rport_number = 0;
 439         fc_host->next_target_id = 0;
 440         fc_host->next_vport_number = 0;
 441         fc_host->npiv_vports_inuse = 0;
 442
 443         snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
 444                  "fc_wq_%d", shost->host_no);
 445         fc_host->work_q = alloc_workqueue("%s", 0, 0, fc_host->work_q_name);
 446         if (!fc_host->work_q)
 447                 return -ENOMEM;
 448
 449         fc_host->dev_loss_tmo = fc_dev_loss_tmo;
 450         snprintf(fc_host->devloss_work_q_name,
 451                  sizeof(fc_host->devloss_work_q_name),
 452                  "fc_dl_%d", shost->host_no);
 453         fc_host->devloss_work_q = alloc_workqueue("%s", 0, 0,
 454                                         fc_host->devloss_work_q_name);
 455         if (!fc_host->devloss_work_q) {
 456                 destroy_workqueue(fc_host->work_q);
 457                 fc_host->work_q = NULL;
 458                 return -ENOMEM;
 459         }
 460
 461         fc_bsg_hostadd(shost, fc_host);
 462         /* ignore any bsg add error - we just can't do sgio */
 463
 464         return 0;
 465 }
 466
 467 static int fc_host_remove(struct transport_container *tc, struct device *dev,
 468                          struct device *cdev)
 469 {
 470         struct Scsi_Host *shost = dev_to_shost(dev);
 471         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 472
 473         fc_bsg_remove(fc_host->rqst_q);
 474         return 0;
 475 }
 476
 477 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 478                                "fc_host",
 479                                fc_host_setup,
 480                                fc_host_remove,
 481                                NULL);
 482
 483 /*
 484  * Setup and Remove actions for remote ports are handled
 485  * in the service functions below.
 486  */
 487 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 488                                "fc_remote_ports",
 489                                NULL,
 490                                NULL,
 491                                NULL);
 492
 493 /*
 494  * Setup and Remove actions for virtual ports are handled
 495  * in the service functions below.
 496  */
 497 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
 498                                "fc_vports",
 499                                NULL,
 500                                NULL,
 501                                NULL);
 502
 503 /*
 504  * Netlink Infrastructure
 505  */
 506
 507 static atomic_t fc_event_seq;
 508
 509 /**
 510  * fc_get_event_number - Obtain the next sequential FC event number
 511  *
 512  * Notes:
 513  *   We could have inlined this, but it would have required fc_event_seq to
 514  *   be exposed. For now, live with the subroutine call.
 515  *   Atomic used to avoid lock/unlock...
 516  */
 517 u32
 518 fc_get_event_number(void)
 519 {
 520         return atomic_add_return(1, &fc_event_seq);
 521 }
 522 EXPORT_SYMBOL(fc_get_event_number);
 523
 524 /**
 525  * fc_host_post_fc_event - routine to do the work of posting an event
 526  *                      on an fc_host.
 527  * @shost:              host the event occurred on
 528  * @event_number:       fc event number obtained from get_fc_event_number()
 529  * @event_code:         fc_host event being posted
 530  * @data_len:           amount, in bytes, of event data
 531  * @data_buf:           pointer to event data
 532  * @vendor_id:          value for Vendor id
 533  *
 534  * Notes:
 535  *      This routine assumes no locks are held on entry.
 536  */
 537 void
 538 fc_host_post_fc_event(struct Scsi_Host *shost, u32 event_number,
 539                 enum fc_host_event_code event_code,
 540                 u32 data_len, char *data_buf, u64 vendor_id)
 541 {
 542         struct sk_buff *skb;
 543         struct nlmsghdr *nlh;
 544         struct fc_nl_event *event;
 545         const char *name;
 546         u32 len;
 547         int err;
 548
 549         if (!data_buf || data_len < 4)
 550                 data_len = 0;
 551
 552         if (!scsi_nl_sock) {
 553                 err = -ENOENT;
 554                 goto send_fail;
 555         }
 556
 557         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
 558
 559         skb = nlmsg_new(len, GFP_KERNEL);
 560         if (!skb) {
 561                 err = -ENOBUFS;
 562                 goto send_fail;
 563         }
 564
 565         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
 566         if (!nlh) {
 567                 err = -ENOBUFS;
 568                 goto send_fail_skb;
 569         }
 570         event = nlmsg_data(nlh);
 571
 572         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 573                                 FC_NL_ASYNC_EVENT, len);
 574         event->seconds = ktime_get_real_seconds();
 575         event->vendor_id = vendor_id;
 576         event->host_no = shost->host_no;
 577         event->event_datalen = data_len;        /* bytes */
 578         event->event_num = event_number;
 579         event->event_code = event_code;
 580         if (data_len)
 581                 memcpy(&event->event_data, data_buf, data_len);
 582
 583         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 584                         GFP_KERNEL);
 585         return;
 586
 587 send_fail_skb:
 588         kfree_skb(skb);
 589 send_fail:
 590         name = get_fc_host_event_code_name(event_code);
 591         printk(KERN_WARNING
 592                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
 593                 __func__, shost->host_no,
 594                 (name) ? name : "<unknown>",
 595                 (data_len) ? *((u32 *)data_buf) : 0xFFFFFFFF, err);
 596         return;
 597 }
 598 EXPORT_SYMBOL(fc_host_post_fc_event);
 599
 600 /**
 601  * fc_host_post_event - called to post an even on an fc_host.
 602  * @shost:              host the event occurred on
 603  * @event_number:       fc event number obtained from get_fc_event_number()
 604  * @event_code:         fc_host event being posted
 605  * @event_data:         32bits of data for the event being posted
 606  *
 607  * Notes:
 608  *      This routine assumes no locks are held on entry.
 609  */
 610 void
 611 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
 612                 enum fc_host_event_code event_code, u32 event_data)
 613 {
 614         fc_host_post_fc_event(shost, event_number, event_code,
 615                 (u32)sizeof(u32), (char *)&event_data, 0);
 616 }
 617 EXPORT_SYMBOL(fc_host_post_event);
 618
 619
 620 /**
 621  * fc_host_post_vendor_event - called to post a vendor unique event
 622  *                      on an fc_host
 623  * @shost:              host the event occurred on
 624  * @event_number:       fc event number obtained from get_fc_event_number()
 625  * @data_len:           amount, in bytes, of vendor unique data
 626  * @data_buf:           pointer to vendor unique data
 627  * @vendor_id:          Vendor id
 628  *
 629  * Notes:
 630  *      This routine assumes no locks are held on entry.
 631  */
 632 void
 633 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
 634                 u32 data_len, char * data_buf, u64 vendor_id)
 635 {
 636         fc_host_post_fc_event(shost, event_number, FCH_EVT_VENDOR_UNIQUE,
 637                 data_len, data_buf, vendor_id);
 638 }
 639 EXPORT_SYMBOL(fc_host_post_vendor_event);
 640
 641 /**
 642  * fc_find_rport_by_wwpn - find the fc_rport pointer for a given wwpn
 643  * @shost:              host the fc_rport is associated with
 644  * @wwpn:               wwpn of the fc_rport device
 645  *
 646  * Notes:
 647  *      This routine assumes no locks are held on entry.
 648  */
 649 struct fc_rport *
 650 fc_find_rport_by_wwpn(struct Scsi_Host *shost, u64 wwpn)
 651 {
 652         struct fc_rport *rport;
 653         unsigned long flags;
 654
 655         spin_lock_irqsave(shost->host_lock, flags);
 656
 657         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
 658                 if (rport->port_state != FC_PORTSTATE_ONLINE)
 659                         continue;
 660
 661                 if (rport->port_name == wwpn) {
 662                         spin_unlock_irqrestore(shost->host_lock, flags);
 663                         return rport;
 664                 }
 665         }
 666
 667         spin_unlock_irqrestore(shost->host_lock, flags);
 668         return NULL;
 669 }
 670 EXPORT_SYMBOL(fc_find_rport_by_wwpn);
 671
 672 static void
 673 fc_li_stats_update(struct fc_fn_li_desc *li_desc,
 674                    struct fc_fpin_stats *stats)
 675 {
 676         stats->li += be32_to_cpu(li_desc->event_count);
 677         switch (be16_to_cpu(li_desc->event_type)) {
 678         case FPIN_LI_UNKNOWN:
 679                 stats->li_failure_unknown +=
 680                     be32_to_cpu(li_desc->event_count);
 681                 break;
 682         case FPIN_LI_LINK_FAILURE:
 683                 stats->li_link_failure_count +=
 684                     be32_to_cpu(li_desc->event_count);
 685                 break;
 686         case FPIN_LI_LOSS_OF_SYNC:
 687                 stats->li_loss_of_sync_count +=
 688                     be32_to_cpu(li_desc->event_count);
 689                 break;
 690         case FPIN_LI_LOSS_OF_SIG:
 691                 stats->li_loss_of_signals_count +=
 692                     be32_to_cpu(li_desc->event_count);
 693                 break;
 694         case FPIN_LI_PRIM_SEQ_ERR:
 695                 stats->li_prim_seq_err_count +=
 696                     be32_to_cpu(li_desc->event_count);
 697                 break;
 698         case FPIN_LI_INVALID_TX_WD:
 699                 stats->li_invalid_tx_word_count +=
 700                     be32_to_cpu(li_desc->event_count);
 701                 break;
 702         case FPIN_LI_INVALID_CRC:
 703                 stats->li_invalid_crc_count +=
 704                     be32_to_cpu(li_desc->event_count);
 705                 break;
 706         case FPIN_LI_DEVICE_SPEC:
 707                 stats->li_device_specific +=
 708                     be32_to_cpu(li_desc->event_count);
 709                 break;
 710         }
 711 }
 712
 713 static void
 714 fc_delivery_stats_update(u32 reason_code, struct fc_fpin_stats *stats)
 715 {
 716         stats->dn++;
 717         switch (reason_code) {
 718         case FPIN_DELI_UNKNOWN:
 719                 stats->dn_unknown++;
 720                 break;
 721         case FPIN_DELI_TIMEOUT:
 722                 stats->dn_timeout++;
 723                 break;
 724         case FPIN_DELI_UNABLE_TO_ROUTE:
 725                 stats->dn_unable_to_route++;
 726                 break;
 727         case FPIN_DELI_DEVICE_SPEC:
 728                 stats->dn_device_specific++;
 729                 break;
 730         }
 731 }
 732
 733 static void
 734 fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats)
 735 {
 736         stats->cn++;
 737         switch (event_type) {
 738         case FPIN_CONGN_CLEAR:
 739                 stats->cn_clear++;
 740                 break;
 741         case FPIN_CONGN_LOST_CREDIT:
 742                 stats->cn_lost_credit++;
 743                 break;
 744         case FPIN_CONGN_CREDIT_STALL:
 745                 stats->cn_credit_stall++;
 746                 break;
 747         case FPIN_CONGN_OVERSUBSCRIPTION:
 748                 stats->cn_oversubscription++;
 749                 break;
 750         case FPIN_CONGN_DEVICE_SPEC:
 751                 stats->cn_device_specific++;
 752         }
 753 }
 754
 755 /*
 756  * fc_fpin_li_stats_update - routine to update Link Integrity
 757  * event statistics.
 758  * @shost:              host the FPIN was received on
 759  * @tlv:                pointer to link integrity descriptor
 760  *
 761  */
 762 static void
 763 fc_fpin_li_stats_update(struct Scsi_Host *shost, struct fc_tlv_desc *tlv)
 764 {
 765         u8 i;
 766         struct fc_rport *rport = NULL;
 767         struct fc_rport *attach_rport = NULL;
 768         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 769         struct fc_fn_li_desc *li_desc = (struct fc_fn_li_desc *)tlv;
 770         u64 wwpn;
 771
 772         rport = fc_find_rport_by_wwpn(shost,
 773                                       be64_to_cpu(li_desc->attached_wwpn));
 774         if (rport &&
 775             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 776              rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 777                 attach_rport = rport;
 778                 fc_li_stats_update(li_desc, &attach_rport->fpin_stats);
 779         }
 780
 781         if (be32_to_cpu(li_desc->pname_count) > 0) {
 782                 for (i = 0;
 783                     i < be32_to_cpu(li_desc->pname_count);
 784                     i++) {
 785                         wwpn = be64_to_cpu(li_desc->pname_list[i]);
 786                         rport = fc_find_rport_by_wwpn(shost, wwpn);
 787                         if (rport &&
 788                             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 789                             rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 790                                 if (rport == attach_rport)
 791                                         continue;
 792                                 fc_li_stats_update(li_desc,
 793                                                    &rport->fpin_stats);
 794                         }
 795                 }
 796         }
 797
 798         if (fc_host->port_name == be64_to_cpu(li_desc->attached_wwpn))
 799                 fc_li_stats_update(li_desc, &fc_host->fpin_stats);
 800 }
 801
 802 /*
 803  * fc_fpin_delivery_stats_update - routine to update Delivery Notification
 804  * event statistics.
 805  * @shost:              host the FPIN was received on
 806  * @tlv:                pointer to delivery descriptor
 807  *
 808  */
 809 static void
 810 fc_fpin_delivery_stats_update(struct Scsi_Host *shost,
 811                               struct fc_tlv_desc *tlv)
 812 {
 813         struct fc_rport *rport = NULL;
 814         struct fc_rport *attach_rport = NULL;
 815         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 816         struct fc_fn_deli_desc *dn_desc = (struct fc_fn_deli_desc *)tlv;
 817         u32 reason_code = be32_to_cpu(dn_desc->deli_reason_code);
 818
 819         rport = fc_find_rport_by_wwpn(shost,
 820                                       be64_to_cpu(dn_desc->attached_wwpn));
 821         if (rport &&
 822             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 823              rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 824                 attach_rport = rport;
 825                 fc_delivery_stats_update(reason_code,
 826                                          &attach_rport->fpin_stats);
 827         }
 828
 829         if (fc_host->port_name == be64_to_cpu(dn_desc->attached_wwpn))
 830                 fc_delivery_stats_update(reason_code, &fc_host->fpin_stats);
 831 }
 832
 833 /*
 834  * fc_fpin_peer_congn_stats_update - routine to update Peer Congestion
 835  * event statistics.
 836  * @shost:              host the FPIN was received on
 837  * @tlv:                pointer to peer congestion descriptor
 838  *
 839  */
 840 static void
 841 fc_fpin_peer_congn_stats_update(struct Scsi_Host *shost,
 842                                 struct fc_tlv_desc *tlv)
 843 {
 844         u8 i;
 845         struct fc_rport *rport = NULL;
 846         struct fc_rport *attach_rport = NULL;
 847         struct fc_fn_peer_congn_desc *pc_desc =
 848             (struct fc_fn_peer_congn_desc *)tlv;
 849         u16 event_type = be16_to_cpu(pc_desc->event_type);
 850         u64 wwpn;
 851
 852         rport = fc_find_rport_by_wwpn(shost,
 853                                       be64_to_cpu(pc_desc->attached_wwpn));
 854         if (rport &&
 855             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 856              rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 857                 attach_rport = rport;
 858                 fc_cn_stats_update(event_type, &attach_rport->fpin_stats);
 859         }
 860
 861         if (be32_to_cpu(pc_desc->pname_count) > 0) {
 862                 for (i = 0;
 863                     i < be32_to_cpu(pc_desc->pname_count);
 864                     i++) {
 865                         wwpn = be64_to_cpu(pc_desc->pname_list[i]);
 866                         rport = fc_find_rport_by_wwpn(shost, wwpn);
 867                         if (rport &&
 868                             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 869                              rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 870                                 if (rport == attach_rport)
 871                                         continue;
 872                                 fc_cn_stats_update(event_type,
 873                                                    &rport->fpin_stats);
 874                         }
 875                 }
 876         }
 877 }
 878
 879 /*
 880  * fc_fpin_congn_stats_update - routine to update Congestion
 881  * event statistics.
 882  * @shost:              host the FPIN was received on
 883  * @tlv:                pointer to congestion descriptor
 884  *
 885  */
 886 static void
 887 fc_fpin_congn_stats_update(struct Scsi_Host *shost,
 888                            struct fc_tlv_desc *tlv)
 889 {
 890         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 891         struct fc_fn_congn_desc *congn = (struct fc_fn_congn_desc *)tlv;
 892
 893         fc_cn_stats_update(be16_to_cpu(congn->event_type),
 894                            &fc_host->fpin_stats);
 895 }
 896
 897 /**
 898  * fc_host_fpin_rcv - routine to process a received FPIN.
 899  * @shost:              host the FPIN was received on
 900  * @fpin_len:           length of FPIN payload, in bytes
 901  * @fpin_buf:           pointer to FPIN payload
 902  *
 903  * Notes:
 904  *      This routine assumes no locks are held on entry.
 905  */
 906 void
 907 fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf)
 908 {
 909         struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf;
 910         struct fc_tlv_desc *tlv;
 911         u32 desc_cnt = 0, bytes_remain;
 912         u32 dtag;
 913
 914         /* Update Statistics */
 915         tlv = (struct fc_tlv_desc *)&fpin->fpin_desc[0];
 916         bytes_remain = fpin_len - offsetof(struct fc_els_fpin, fpin_desc);
 917         bytes_remain = min_t(u32, bytes_remain, be32_to_cpu(fpin->desc_len));
 918
 919         while (bytes_remain >= FC_TLV_DESC_HDR_SZ &&
 920                bytes_remain >= FC_TLV_DESC_SZ_FROM_LENGTH(tlv)) {
 921                 dtag = be32_to_cpu(tlv->desc_tag);
 922                 switch (dtag) {
 923                 case ELS_DTAG_LNK_INTEGRITY:
 924                         fc_fpin_li_stats_update(shost, tlv);
 925                         break;
 926                 case ELS_DTAG_DELIVERY:
 927                         fc_fpin_delivery_stats_update(shost, tlv);
 928                         break;
 929                 case ELS_DTAG_PEER_CONGEST:
 930                         fc_fpin_peer_congn_stats_update(shost, tlv);
 931                         break;
 932                 case ELS_DTAG_CONGESTION:
 933                         fc_fpin_congn_stats_update(shost, tlv);
 934                 }
 935
 936                 desc_cnt++;
 937                 bytes_remain -= FC_TLV_DESC_SZ_FROM_LENGTH(tlv);
 938                 tlv = fc_tlv_next_desc(tlv);
 939         }
 940
 941         fc_host_post_fc_event(shost, fc_get_event_number(),
 942                                 FCH_EVT_LINK_FPIN, fpin_len, fpin_buf, 0);
 943 }
 944 EXPORT_SYMBOL(fc_host_fpin_rcv);
 945
 946
 947 static __init int fc_transport_init(void)
 948 {
 949         int error;
 950
 951         atomic_set(&fc_event_seq, 0);
 952
 953         error = transport_class_register(&fc_host_class);
 954         if (error)
 955                 return error;
 956         error = transport_class_register(&fc_vport_class);
 957         if (error)
 958                 goto unreg_host_class;
 959         error = transport_class_register(&fc_rport_class);
 960         if (error)
 961                 goto unreg_vport_class;
 962         error = transport_class_register(&fc_transport_class);
 963         if (error)
 964                 goto unreg_rport_class;
 965         return 0;
 966
 967 unreg_rport_class:
 968         transport_class_unregister(&fc_rport_class);
 969 unreg_vport_class:
 970         transport_class_unregister(&fc_vport_class);
 971 unreg_host_class:
 972         transport_class_unregister(&fc_host_class);
 973         return error;
 974 }
 975
 976 static void __exit fc_transport_exit(void)
 977 {
 978         transport_class_unregister(&fc_transport_class);
 979         transport_class_unregister(&fc_rport_class);
 980         transport_class_unregister(&fc_host_class);
 981         transport_class_unregister(&fc_vport_class);
 982 }
 983
 984 /*
 985  * FC Remote Port Attribute Management
 986  */
 987
 988 #define fc_rport_show_function(field, format_string, sz, cast)          \
 989 static ssize_t                                                          \
 990 show_fc_rport_##field (struct device *dev,                              \
 991                        struct device_attribute *attr, char *buf)        \
 992 {                                                                       \
 993         struct fc_rport *rport = transport_class_to_rport(dev);         \
 994         struct Scsi_Host *shost = rport_to_shost(rport);                \
 995         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 996         if ((i->f->get_rport_##field) &&                                \
 997             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 998               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 999               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
1000                 i->f->get_rport_##field(rport);                         \
1001         return snprintf(buf, sz, format_string, cast rport->field);     \
1002 }
1003
1004 #define fc_rport_store_function(field)                                  \
1005 static ssize_t                                                          \
1006 store_fc_rport_##field(struct device *dev,                              \
1007                        struct device_attribute *attr,                   \
1008                        const char *buf, size_t count)                   \
1009 {                                                                       \
1010         int val;                                                        \
1011         struct fc_rport *rport = transport_class_to_rport(dev);         \
1012         struct Scsi_Host *shost = rport_to_shost(rport);                \
1013         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1014         char *cp;                                                       \
1015         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
1016             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
1017             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
1018                 return -EBUSY;                                          \
1019         val = simple_strtoul(buf, &cp, 0);                              \
1020         if (*cp && (*cp != '\n'))                                       \
1021                 return -EINVAL;                                         \
1022         i->f->set_rport_##field(rport, val);                            \
1023         return count;                                                   \
1024 }
1025
1026 #define fc_rport_rd_attr(field, format_string, sz)                      \
1027         fc_rport_show_function(field, format_string, sz, )              \
1028 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
1029                          show_fc_rport_##field, NULL)
1030
1031 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
1032         fc_rport_show_function(field, format_string, sz, (cast))        \
1033 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
1034                           show_fc_rport_##field, NULL)
1035
1036 #define fc_rport_rw_attr(field, format_string, sz)                      \
1037         fc_rport_show_function(field, format_string, sz, )              \
1038         fc_rport_store_function(field)                                  \
1039 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,          \
1040                         show_fc_rport_##field,                          \
1041                         store_fc_rport_##field)
1042
1043
1044 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
1045 static ssize_t                                                          \
1046 show_fc_rport_##field (struct device *dev,                              \
1047                        struct device_attribute *attr, char *buf)        \
1048 {                                                                       \
1049         struct fc_rport *rport = transport_class_to_rport(dev);         \
1050         return snprintf(buf, sz, format_string, cast rport->field);     \
1051 }
1052
1053 #define fc_private_rport_rd_attr(field, format_string, sz)              \
1054         fc_private_rport_show_function(field, format_string, sz, )      \
1055 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
1056                          show_fc_rport_##field, NULL)
1057
1058 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
1059         fc_private_rport_show_function(field, format_string, sz, (cast)) \
1060 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
1061                           show_fc_rport_##field, NULL)
1062
1063
1064 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
1065 static ssize_t                                                          \
1066 show_fc_rport_##title (struct device *dev,                              \
1067                        struct device_attribute *attr, char *buf)        \
1068 {                                                                       \
1069         struct fc_rport *rport = transport_class_to_rport(dev);         \
1070         const char *name;                                               \
1071         name = get_fc_##title##_name(rport->title);                     \
1072         if (!name)                                                      \
1073                 return -EINVAL;                                         \
1074         return snprintf(buf, maxlen, "%s\n", name);                     \
1075 }                                                                       \
1076 static FC_DEVICE_ATTR(rport, title, S_IRUGO,                    \
1077                         show_fc_rport_##title, NULL)
1078
1079
1080 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
1081         i->private_rport_attrs[count] = device_attr_rport_##field; \
1082         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
1083         i->private_rport_attrs[count].store = NULL;                     \
1084         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
1085         if (i->f->show_rport_##field)                                   \
1086                 count++
1087
1088 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
1089         i->private_rport_attrs[count] = device_attr_rport_##field; \
1090         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
1091         i->private_rport_attrs[count].store = NULL;                     \
1092         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
1093         count++
1094
1095 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
1096         i->private_rport_attrs[count] = device_attr_rport_##field; \
1097         if (!i->f->set_rport_##field) {                                 \
1098                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
1099                 i->private_rport_attrs[count].store = NULL;             \
1100         }                                                               \
1101         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
1102         if (i->f->show_rport_##field)                                   \
1103                 count++
1104
1105 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
1106 {                                                                       \
1107         i->private_rport_attrs[count] = device_attr_rport_##field; \
1108         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
1109         count++;                                                        \
1110 }
1111
1112
1113 /* The FC Transport Remote Port Attributes: */
1114
1115 /* Fixed Remote Port Attributes */
1116
1117 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
1118
1119 static ssize_t
1120 show_fc_rport_supported_classes (struct device *dev,
1121                                  struct device_attribute *attr, char *buf)
1122 {
1123         struct fc_rport *rport = transport_class_to_rport(dev);
1124         if (rport->supported_classes == FC_COS_UNSPECIFIED)
1125                 return snprintf(buf, 20, "unspecified\n");
1126         return get_fc_cos_names(rport->supported_classes, buf);
1127 }
1128 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
1129                 show_fc_rport_supported_classes, NULL);
1130
1131 /* Dynamic Remote Port Attributes */
1132
1133 /*
1134  * dev_loss_tmo attribute
1135  */
1136 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
1137 {
1138         char *cp;
1139
1140         *val = simple_strtoul(buf, &cp, 0);
1141         if (*cp && (*cp != '\n'))
1142                 return -EINVAL;
1143         /*
1144          * Check for overflow; dev_loss_tmo is u32
1145          */
1146         if (*val > UINT_MAX)
1147                 return -EINVAL;
1148
1149         return 0;
1150 }
1151
1152 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
1153                                      unsigned long val)
1154 {
1155         struct Scsi_Host *shost = rport_to_shost(rport);
1156         struct fc_internal *i = to_fc_internal(shost->transportt);
1157
1158         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
1159             (rport->port_state == FC_PORTSTATE_DELETED) ||
1160             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
1161                 return -EBUSY;
1162         /*
1163          * Check for overflow; dev_loss_tmo is u32
1164          */
1165         if (val > UINT_MAX)
1166                 return -EINVAL;
1167
1168         /*
1169          * If fast_io_fail is off we have to cap
1170          * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
1171          */
1172         if (rport->fast_io_fail_tmo == -1 &&
1173             val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
1174                 return -EINVAL;
1175
1176         i->f->set_rport_dev_loss_tmo(rport, val);
1177         return 0;
1178 }
1179
1180 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
1181 static ssize_t
1182 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
1183                             const char *buf, size_t count)
1184 {
1185         struct fc_rport *rport = transport_class_to_rport(dev);
1186         unsigned long val;
1187         int rc;
1188
1189         rc = fc_str_to_dev_loss(buf, &val);
1190         if (rc)
1191                 return rc;
1192
1193         rc = fc_rport_set_dev_loss_tmo(rport, val);
1194         if (rc)
1195                 return rc;
1196         return count;
1197 }
1198 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
1199                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
1200
1201
1202 /* Private Remote Port Attributes */
1203
1204 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1205 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1206 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
1207
1208 static ssize_t
1209 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
1210                      char *buf)
1211 {
1212         struct fc_rport *rport = transport_class_to_rport(dev);
1213
1214         /* identify any roles that are port_id specific */
1215         if ((rport->port_id != -1) &&
1216             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
1217                                         FC_WELLKNOWN_PORTID_MASK) {
1218                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
1219                 case FC_FPORT_PORTID:
1220                         return snprintf(buf, 30, "Fabric Port\n");
1221                 case FC_FABCTLR_PORTID:
1222                         return snprintf(buf, 30, "Fabric Controller\n");
1223                 case FC_DIRSRVR_PORTID:
1224                         return snprintf(buf, 30, "Directory Server\n");
1225                 case FC_TIMESRVR_PORTID:
1226                         return snprintf(buf, 30, "Time Server\n");
1227                 case FC_MGMTSRVR_PORTID:
1228                         return snprintf(buf, 30, "Management Server\n");
1229                 default:
1230                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
1231                 }
1232         } else {
1233                 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
1234                         return snprintf(buf, 20, "unknown\n");
1235                 return get_fc_port_roles_names(rport->roles, buf);
1236         }
1237 }
1238 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
1239                 show_fc_rport_roles, NULL);
1240
1241 static ssize_t fc_rport_set_marginal_state(struct device *dev,
1242                                                 struct device_attribute *attr,
1243                                                 const char *buf, size_t count)
1244 {
1245         struct fc_rport *rport = transport_class_to_rport(dev);
1246         enum fc_port_state port_state;
1247         int ret = 0;
1248
1249         ret = get_fc_port_state_match(buf, &port_state);
1250         if (ret)
1251                 return -EINVAL;
1252         if (port_state == FC_PORTSTATE_MARGINAL) {
1253                 /*
1254                  * Change the state to Marginal only if the
1255                  * current rport state is Online
1256                  * Allow only Online->Marginal
1257                  */
1258                 if (rport->port_state == FC_PORTSTATE_ONLINE)
1259                         rport->port_state = port_state;
1260                 else
1261                         return -EINVAL;
1262         } else if (port_state == FC_PORTSTATE_ONLINE) {
1263                 /*
1264                  * Change the state to Online only if the
1265                  * current rport state is Marginal
1266                  * Allow only Marginal->Online
1267                  */
1268                 if (rport->port_state == FC_PORTSTATE_MARGINAL)
1269                         rport->port_state = port_state;
1270                 else
1271                         return -EINVAL;
1272         } else
1273                 return -EINVAL;
1274         return count;
1275 }
1276
1277 static ssize_t
1278 show_fc_rport_port_state(struct device *dev,
1279                                 struct device_attribute *attr, char *buf)
1280 {
1281         const char *name;
1282         struct fc_rport *rport = transport_class_to_rport(dev);
1283
1284         name = get_fc_port_state_name(rport->port_state);
1285         if (!name)
1286                 return -EINVAL;
1287
1288         return snprintf(buf, 20, "%s\n", name);
1289 }
1290
1291 static FC_DEVICE_ATTR(rport, port_state, 0444 | 0200,
1292                         show_fc_rport_port_state, fc_rport_set_marginal_state);
1293
1294 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
1295
1296 /*
1297  * fast_io_fail_tmo attribute
1298  */
1299 static ssize_t
1300 show_fc_rport_fast_io_fail_tmo (struct device *dev,
1301                                 struct device_attribute *attr, char *buf)
1302 {
1303         struct fc_rport *rport = transport_class_to_rport(dev);
1304
1305         if (rport->fast_io_fail_tmo == -1)
1306                 return snprintf(buf, 5, "off\n");
1307         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
1308 }
1309
1310 static ssize_t
1311 store_fc_rport_fast_io_fail_tmo(struct device *dev,
1312                                 struct device_attribute *attr, const char *buf,
1313                                 size_t count)
1314 {
1315         int val;
1316         char *cp;
1317         struct fc_rport *rport = transport_class_to_rport(dev);
1318
1319         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
1320             (rport->port_state == FC_PORTSTATE_DELETED) ||
1321             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
1322                 return -EBUSY;
1323         if (strncmp(buf, "off", 3) == 0)
1324                 rport->fast_io_fail_tmo = -1;
1325         else {
1326                 val = simple_strtoul(buf, &cp, 0);
1327                 if ((*cp && (*cp != '\n')) || (val < 0))
1328                         return -EINVAL;
1329                 /*
1330                  * Cap fast_io_fail by dev_loss_tmo or
1331                  * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
1332                  */
1333                 if ((val >= rport->dev_loss_tmo) ||
1334                     (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
1335                         return -EINVAL;
1336
1337                 rport->fast_io_fail_tmo = val;
1338         }
1339         return count;
1340 }
1341 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
1342         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
1343
1344 #define fc_rport_fpin_statistic(name)                                   \
1345 static ssize_t fc_rport_fpinstat_##name(struct device *cd,              \
1346                                   struct device_attribute *attr,        \
1347                                   char *buf)                            \
1348 {                                                                       \
1349         struct fc_rport *rport = transport_class_to_rport(cd);          \
1350                                                                         \
1351         return snprintf(buf, 20, "0x%llx\n", rport->fpin_stats.name);   \
1352 }                                                                       \
1353 static FC_DEVICE_ATTR(rport, fpin_##name, 0444, fc_rport_fpinstat_##name, NULL)
1354
1355 fc_rport_fpin_statistic(dn);
1356 fc_rport_fpin_statistic(dn_unknown);
1357 fc_rport_fpin_statistic(dn_timeout);
1358 fc_rport_fpin_statistic(dn_unable_to_route);
1359 fc_rport_fpin_statistic(dn_device_specific);
1360 fc_rport_fpin_statistic(cn);
1361 fc_rport_fpin_statistic(cn_clear);
1362 fc_rport_fpin_statistic(cn_lost_credit);
1363 fc_rport_fpin_statistic(cn_credit_stall);
1364 fc_rport_fpin_statistic(cn_oversubscription);
1365 fc_rport_fpin_statistic(cn_device_specific);
1366 fc_rport_fpin_statistic(li);
1367 fc_rport_fpin_statistic(li_failure_unknown);
1368 fc_rport_fpin_statistic(li_link_failure_count);
1369 fc_rport_fpin_statistic(li_loss_of_sync_count);
1370 fc_rport_fpin_statistic(li_loss_of_signals_count);
1371 fc_rport_fpin_statistic(li_prim_seq_err_count);
1372 fc_rport_fpin_statistic(li_invalid_tx_word_count);
1373 fc_rport_fpin_statistic(li_invalid_crc_count);
1374 fc_rport_fpin_statistic(li_device_specific);
1375
1376 static struct attribute *fc_rport_statistics_attrs[] = {
1377         &device_attr_rport_fpin_dn.attr,
1378         &device_attr_rport_fpin_dn_unknown.attr,
1379         &device_attr_rport_fpin_dn_timeout.attr,
1380         &device_attr_rport_fpin_dn_unable_to_route.attr,
1381         &device_attr_rport_fpin_dn_device_specific.attr,
1382         &device_attr_rport_fpin_li.attr,
1383         &device_attr_rport_fpin_li_failure_unknown.attr,
1384         &device_attr_rport_fpin_li_link_failure_count.attr,
1385         &device_attr_rport_fpin_li_loss_of_sync_count.attr,
1386         &device_attr_rport_fpin_li_loss_of_signals_count.attr,
1387         &device_attr_rport_fpin_li_prim_seq_err_count.attr,
1388         &device_attr_rport_fpin_li_invalid_tx_word_count.attr,
1389         &device_attr_rport_fpin_li_invalid_crc_count.attr,
1390         &device_attr_rport_fpin_li_device_specific.attr,
1391         &device_attr_rport_fpin_cn.attr,
1392         &device_attr_rport_fpin_cn_clear.attr,
1393         &device_attr_rport_fpin_cn_lost_credit.attr,
1394         &device_attr_rport_fpin_cn_credit_stall.attr,
1395         &device_attr_rport_fpin_cn_oversubscription.attr,
1396         &device_attr_rport_fpin_cn_device_specific.attr,
1397         NULL
1398 };
1399
1400 static struct attribute_group fc_rport_statistics_group = {
1401         .name = "statistics",
1402         .attrs = fc_rport_statistics_attrs,
1403 };
1404
1405
1406 /*
1407  * FC SCSI Target Attribute Management
1408  */
1409
1410 /*
1411  * Note: in the target show function we recognize when the remote
1412  *  port is in the hierarchy and do not allow the driver to get
1413  *  involved in sysfs functions. The driver only gets involved if
1414  *  it's the "old" style that doesn't use rports.
1415  */
1416 #define fc_starget_show_function(field, format_string, sz, cast)        \
1417 static ssize_t                                                          \
1418 show_fc_starget_##field (struct device *dev,                            \
1419                          struct device_attribute *attr, char *buf)      \
1420 {                                                                       \
1421         struct scsi_target *starget = transport_class_to_starget(dev);  \
1422         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
1423         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1424         struct fc_rport *rport = starget_to_rport(starget);             \
1425         if (rport)                                                      \
1426                 fc_starget_##field(starget) = rport->field;             \
1427         else if (i->f->get_starget_##field)                             \
1428                 i->f->get_starget_##field(starget);                     \
1429         return snprintf(buf, sz, format_string,                         \
1430                 cast fc_starget_##field(starget));                      \
1431 }
1432
1433 #define fc_starget_rd_attr(field, format_string, sz)                    \
1434         fc_starget_show_function(field, format_string, sz, )            \
1435 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
1436                          show_fc_starget_##field, NULL)
1437
1438 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
1439         fc_starget_show_function(field, format_string, sz, (cast))      \
1440 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
1441                           show_fc_starget_##field, NULL)
1442
1443 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
1444         i->private_starget_attrs[count] = device_attr_starget_##field; \
1445         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
1446         i->private_starget_attrs[count].store = NULL;                   \
1447         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1448         if (i->f->show_starget_##field)                                 \
1449                 count++
1450
1451 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
1452         i->private_starget_attrs[count] = device_attr_starget_##field; \
1453         if (!i->f->set_starget_##field) {                               \
1454                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
1455                 i->private_starget_attrs[count].store = NULL;           \
1456         }                                                               \
1457         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1458         if (i->f->show_starget_##field)                                 \
1459                 count++
1460
1461 /* The FC Transport SCSI Target Attributes: */
1462 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1463 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1464 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1465
1466
1467 /*
1468  * FC Virtual Port Attribute Management
1469  */
1470
1471 #define fc_vport_show_function(field, format_string, sz, cast)          \
1472 static ssize_t                                                          \
1473 show_fc_vport_##field (struct device *dev,                              \
1474                        struct device_attribute *attr, char *buf)        \
1475 {                                                                       \
1476         struct fc_vport *vport = transport_class_to_vport(dev);         \
1477         struct Scsi_Host *shost = vport_to_shost(vport);                \
1478         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1479         if ((i->f->get_vport_##field) &&                                \
1480             !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))       \
1481                 i->f->get_vport_##field(vport);                         \
1482         return snprintf(buf, sz, format_string, cast vport->field);     \
1483 }
1484
1485 #define fc_vport_store_function(field)                                  \
1486 static ssize_t                                                          \
1487 store_fc_vport_##field(struct device *dev,                              \
1488                        struct device_attribute *attr,                   \
1489                        const char *buf, size_t count)                   \
1490 {                                                                       \
1491         int val;                                                        \
1492         struct fc_vport *vport = transport_class_to_vport(dev);         \
1493         struct Scsi_Host *shost = vport_to_shost(vport);                \
1494         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1495         char *cp;                                                       \
1496         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))  \
1497                 return -EBUSY;                                          \
1498         val = simple_strtoul(buf, &cp, 0);                              \
1499         if (*cp && (*cp != '\n'))                                       \
1500                 return -EINVAL;                                         \
1501         i->f->set_vport_##field(vport, val);                            \
1502         return count;                                                   \
1503 }
1504
1505 #define fc_vport_store_str_function(field, slen)                        \
1506 static ssize_t                                                          \
1507 store_fc_vport_##field(struct device *dev,                              \
1508                        struct device_attribute *attr,                   \
1509                        const char *buf, size_t count)                   \
1510 {                                                                       \
1511         struct fc_vport *vport = transport_class_to_vport(dev);         \
1512         struct Scsi_Host *shost = vport_to_shost(vport);                \
1513         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1514         unsigned int cnt=count;                                         \
1515                                                                         \
1516         /* count may include a LF at end of string */                   \
1517         if (buf[cnt-1] == '\n')                                         \
1518                 cnt--;                                                  \
1519         if (cnt > ((slen) - 1))                                         \
1520                 return -EINVAL;                                         \
1521         memcpy(vport->field, buf, cnt);                                 \
1522         i->f->set_vport_##field(vport);                                 \
1523         return count;                                                   \
1524 }
1525
1526 #define fc_vport_rd_attr(field, format_string, sz)                      \
1527         fc_vport_show_function(field, format_string, sz, )              \
1528 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1529                          show_fc_vport_##field, NULL)
1530
1531 #define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
1532         fc_vport_show_function(field, format_string, sz, (cast))        \
1533 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1534                           show_fc_vport_##field, NULL)
1535
1536 #define fc_vport_rw_attr(field, format_string, sz)                      \
1537         fc_vport_show_function(field, format_string, sz, )              \
1538         fc_vport_store_function(field)                                  \
1539 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1540                         show_fc_vport_##field,                          \
1541                         store_fc_vport_##field)
1542
1543 #define fc_private_vport_show_function(field, format_string, sz, cast)  \
1544 static ssize_t                                                          \
1545 show_fc_vport_##field (struct device *dev,                              \
1546                        struct device_attribute *attr, char *buf)        \
1547 {                                                                       \
1548         struct fc_vport *vport = transport_class_to_vport(dev);         \
1549         return snprintf(buf, sz, format_string, cast vport->field);     \
1550 }
1551
1552 #define fc_private_vport_store_u32_function(field)                      \
1553 static ssize_t                                                          \
1554 store_fc_vport_##field(struct device *dev,                              \
1555                        struct device_attribute *attr,                   \
1556                        const char *buf, size_t count)                   \
1557 {                                                                       \
1558         u32 val;                                                        \
1559         struct fc_vport *vport = transport_class_to_vport(dev);         \
1560         char *cp;                                                       \
1561         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))          \
1562                 return -EBUSY;                                          \
1563         val = simple_strtoul(buf, &cp, 0);                              \
1564         if (*cp && (*cp != '\n'))                                       \
1565                 return -EINVAL;                                         \
1566         vport->field = val;                                             \
1567         return count;                                                   \
1568 }
1569
1570
1571 #define fc_private_vport_rd_attr(field, format_string, sz)              \
1572         fc_private_vport_show_function(field, format_string, sz, )      \
1573 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1574                          show_fc_vport_##field, NULL)
1575
1576 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
1577         fc_private_vport_show_function(field, format_string, sz, (cast)) \
1578 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1579                           show_fc_vport_##field, NULL)
1580
1581 #define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
1582         fc_private_vport_show_function(field, format_string, sz, )      \
1583         fc_private_vport_store_u32_function(field)                      \
1584 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1585                         show_fc_vport_##field,                          \
1586                         store_fc_vport_##field)
1587
1588
1589 #define fc_private_vport_rd_enum_attr(title, maxlen)                    \
1590 static ssize_t                                                          \
1591 show_fc_vport_##title (struct device *dev,                              \
1592                        struct device_attribute *attr,                   \
1593                        char *buf)                                       \
1594 {                                                                       \
1595         struct fc_vport *vport = transport_class_to_vport(dev);         \
1596         const char *name;                                               \
1597         name = get_fc_##title##_name(vport->title);                     \
1598         if (!name)                                                      \
1599                 return -EINVAL;                                         \
1600         return snprintf(buf, maxlen, "%s\n", name);                     \
1601 }                                                                       \
1602 static FC_DEVICE_ATTR(vport, title, S_IRUGO,                    \
1603                         show_fc_vport_##title, NULL)
1604
1605
1606 #define SETUP_VPORT_ATTRIBUTE_RD(field)                                 \
1607         i->private_vport_attrs[count] = device_attr_vport_##field; \
1608         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1609         i->private_vport_attrs[count].store = NULL;                     \
1610         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1611         if (i->f->get_##field)                                          \
1612                 count++
1613         /* NOTE: Above MACRO differs: checks function not show bit */
1614
1615 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                         \
1616         i->private_vport_attrs[count] = device_attr_vport_##field; \
1617         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1618         i->private_vport_attrs[count].store = NULL;                     \
1619         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1620         count++
1621
1622 #define SETUP_VPORT_ATTRIBUTE_WR(field)                                 \
1623         i->private_vport_attrs[count] = device_attr_vport_##field; \
1624         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1625         if (i->f->field)                                                \
1626                 count++
1627         /* NOTE: Above MACRO differs: checks function */
1628
1629 #define SETUP_VPORT_ATTRIBUTE_RW(field)                                 \
1630         i->private_vport_attrs[count] = device_attr_vport_##field; \
1631         if (!i->f->set_vport_##field) {                                 \
1632                 i->private_vport_attrs[count].attr.mode = S_IRUGO;      \
1633                 i->private_vport_attrs[count].store = NULL;             \
1634         }                                                               \
1635         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1636         count++
1637         /* NOTE: Above MACRO differs: does not check show bit */
1638
1639 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                         \
1640 {                                                                       \
1641         i->private_vport_attrs[count] = device_attr_vport_##field; \
1642         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1643         count++;                                                        \
1644 }
1645
1646
1647 /* The FC Transport Virtual Port Attributes: */
1648
1649 /* Fixed Virtual Port Attributes */
1650
1651 /* Dynamic Virtual Port Attributes */
1652
1653 /* Private Virtual Port Attributes */
1654
1655 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1656 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1657 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1658 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1659
1660 static ssize_t
1661 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1662                      char *buf)
1663 {
1664         struct fc_vport *vport = transport_class_to_vport(dev);
1665
1666         if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1667                 return snprintf(buf, 20, "unknown\n");
1668         return get_fc_port_roles_names(vport->roles, buf);
1669 }
1670 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1671
1672 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1673
1674 fc_private_vport_show_function(symbolic_name, "%s\n",
1675                 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1676 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1677 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1678                 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1679
1680 static ssize_t
1681 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1682                       const char *buf, size_t count)
1683 {
1684         struct fc_vport *vport = transport_class_to_vport(dev);
1685         struct Scsi_Host *shost = vport_to_shost(vport);
1686         unsigned long flags;
1687
1688         spin_lock_irqsave(shost->host_lock, flags);
1689         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1690                 spin_unlock_irqrestore(shost->host_lock, flags);
1691                 return -EBUSY;
1692         }
1693         vport->flags |= FC_VPORT_DELETING;
1694         spin_unlock_irqrestore(shost->host_lock, flags);
1695
1696         fc_queue_work(shost, &vport->vport_delete_work);
1697         return count;
1698 }
1699 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1700                         NULL, store_fc_vport_delete);
1701
1702
1703 /*
1704  * Enable/Disable vport
1705  *  Write "1" to disable, write "0" to enable
1706  */
1707 static ssize_t
1708 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1709                        const char *buf,
1710                            size_t count)
1711 {
1712         struct fc_vport *vport = transport_class_to_vport(dev);
1713         struct Scsi_Host *shost = vport_to_shost(vport);
1714         struct fc_internal *i = to_fc_internal(shost->transportt);
1715         int stat;
1716
1717         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1718                 return -EBUSY;
1719
1720         if (*buf == '0') {
1721                 if (vport->vport_state != FC_VPORT_DISABLED)
1722                         return -EALREADY;
1723         } else if (*buf == '1') {
1724                 if (vport->vport_state == FC_VPORT_DISABLED)
1725                         return -EALREADY;
1726         } else
1727                 return -EINVAL;
1728
1729         stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1730         return stat ? stat : count;
1731 }
1732 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1733                         NULL, store_fc_vport_disable);
1734
1735
1736 /*
1737  * Host Attribute Management
1738  */
1739
1740 #define fc_host_show_function(field, format_string, sz, cast)           \
1741 static ssize_t                                                          \
1742 show_fc_host_##field (struct device *dev,                               \
1743                       struct device_attribute *attr, char *buf)         \
1744 {                                                                       \
1745         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1746         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1747         if (i->f->get_host_##field)                                     \
1748                 i->f->get_host_##field(shost);                          \
1749         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1750 }
1751
1752 #define fc_host_store_function(field)                                   \
1753 static ssize_t                                                          \
1754 store_fc_host_##field(struct device *dev,                               \
1755                       struct device_attribute *attr,                    \
1756                       const char *buf,  size_t count)                   \
1757 {                                                                       \
1758         int val;                                                        \
1759         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1760         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1761         char *cp;                                                       \
1762                                                                         \
1763         val = simple_strtoul(buf, &cp, 0);                              \
1764         if (*cp && (*cp != '\n'))                                       \
1765                 return -EINVAL;                                         \
1766         i->f->set_host_##field(shost, val);                             \
1767         return count;                                                   \
1768 }
1769
1770 #define fc_host_store_str_function(field, slen)                         \
1771 static ssize_t                                                          \
1772 store_fc_host_##field(struct device *dev,                               \
1773                       struct device_attribute *attr,                    \
1774                       const char *buf, size_t count)                    \
1775 {                                                                       \
1776         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1777         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1778         unsigned int cnt=count;                                         \
1779                                                                         \
1780         /* count may include a LF at end of string */                   \
1781         if (buf[cnt-1] == '\n')                                         \
1782                 cnt--;                                                  \
1783         if (cnt > ((slen) - 1))                                         \
1784                 return -EINVAL;                                         \
1785         memcpy(fc_host_##field(shost), buf, cnt);                       \
1786         i->f->set_host_##field(shost);                                  \
1787         return count;                                                   \
1788 }
1789
1790 #define fc_host_rd_attr(field, format_string, sz)                       \
1791         fc_host_show_function(field, format_string, sz, )               \
1792 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1793                          show_fc_host_##field, NULL)
1794
1795 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
1796         fc_host_show_function(field, format_string, sz, (cast))         \
1797 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1798                           show_fc_host_##field, NULL)
1799
1800 #define fc_host_rw_attr(field, format_string, sz)                       \
1801         fc_host_show_function(field, format_string, sz, )               \
1802         fc_host_store_function(field)                                   \
1803 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,           \
1804                         show_fc_host_##field,                           \
1805                         store_fc_host_##field)
1806
1807 #define fc_host_rd_enum_attr(title, maxlen)                             \
1808 static ssize_t                                                          \
1809 show_fc_host_##title (struct device *dev,                               \
1810                       struct device_attribute *attr, char *buf)         \
1811 {                                                                       \
1812         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1813         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1814         const char *name;                                               \
1815         if (i->f->get_host_##title)                                     \
1816                 i->f->get_host_##title(shost);                          \
1817         name = get_fc_##title##_name(fc_host_##title(shost));           \
1818         if (!name)                                                      \
1819                 return -EINVAL;                                         \
1820         return snprintf(buf, maxlen, "%s\n", name);                     \
1821 }                                                                       \
1822 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1823
1824 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
1825         i->private_host_attrs[count] = device_attr_host_##field;        \
1826         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1827         i->private_host_attrs[count].store = NULL;                      \
1828         i->host_attrs[count] = &i->private_host_attrs[count];           \
1829         if (i->f->show_host_##field)                                    \
1830                 count++
1831
1832 #define SETUP_HOST_ATTRIBUTE_RD_NS(field)                               \
1833         i->private_host_attrs[count] = device_attr_host_##field;        \
1834         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1835         i->private_host_attrs[count].store = NULL;                      \
1836         i->host_attrs[count] = &i->private_host_attrs[count];           \
1837         count++
1838
1839 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1840         i->private_host_attrs[count] = device_attr_host_##field;        \
1841         if (!i->f->set_host_##field) {                                  \
1842                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1843                 i->private_host_attrs[count].store = NULL;              \
1844         }                                                               \
1845         i->host_attrs[count] = &i->private_host_attrs[count];           \
1846         if (i->f->show_host_##field)                                    \
1847                 count++
1848
1849
1850 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1851 static ssize_t                                                          \
1852 show_fc_host_##field (struct device *dev,                               \
1853                       struct device_attribute *attr, char *buf)         \
1854 {                                                                       \
1855         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1856         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1857 }
1858
1859 #define fc_private_host_rd_attr(field, format_string, sz)               \
1860         fc_private_host_show_function(field, format_string, sz, )       \
1861 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1862                          show_fc_host_##field, NULL)
1863
1864 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1865         fc_private_host_show_function(field, format_string, sz, (cast)) \
1866 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1867                           show_fc_host_##field, NULL)
1868
1869 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1870         i->private_host_attrs[count] = device_attr_host_##field;        \
1871         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1872         i->private_host_attrs[count].store = NULL;                      \
1873         i->host_attrs[count] = &i->private_host_attrs[count];           \
1874         count++
1875
1876 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1877 {                                                                       \
1878         i->private_host_attrs[count] = device_attr_host_##field;        \
1879         i->host_attrs[count] = &i->private_host_attrs[count];           \
1880         count++;                                                        \
1881 }
1882
1883
1884 /* Fixed Host Attributes */
1885
1886 static ssize_t
1887 show_fc_host_supported_classes (struct device *dev,
1888                                 struct device_attribute *attr, char *buf)
1889 {
1890         struct Scsi_Host *shost = transport_class_to_shost(dev);
1891
1892         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1893                 return snprintf(buf, 20, "unspecified\n");
1894
1895         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1896 }
1897 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1898                 show_fc_host_supported_classes, NULL);
1899
1900 static ssize_t
1901 show_fc_host_supported_fc4s (struct device *dev,
1902                              struct device_attribute *attr, char *buf)
1903 {
1904         struct Scsi_Host *shost = transport_class_to_shost(dev);
1905         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1906 }
1907 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1908                 show_fc_host_supported_fc4s, NULL);
1909
1910 static ssize_t
1911 show_fc_host_supported_speeds (struct device *dev,
1912                                struct device_attribute *attr, char *buf)
1913 {
1914         struct Scsi_Host *shost = transport_class_to_shost(dev);
1915
1916         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1917                 return snprintf(buf, 20, "unknown\n");
1918
1919         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1920 }
1921 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1922                 show_fc_host_supported_speeds, NULL);
1923
1924
1925 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1926 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1927 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1928                              unsigned long long);
1929 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1930 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1931 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1932 fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
1933 fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1934 fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1935 fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1936 fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1937 fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1938 fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1939
1940
1941 /* Dynamic Host Attributes */
1942
1943 static ssize_t
1944 show_fc_host_active_fc4s (struct device *dev,
1945                           struct device_attribute *attr, char *buf)
1946 {
1947         struct Scsi_Host *shost = transport_class_to_shost(dev);
1948         struct fc_internal *i = to_fc_internal(shost->transportt);
1949
1950         if (i->f->get_host_active_fc4s)
1951                 i->f->get_host_active_fc4s(shost);
1952
1953         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1954 }
1955 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1956                 show_fc_host_active_fc4s, NULL);
1957
1958 static ssize_t
1959 show_fc_host_speed (struct device *dev,
1960                     struct device_attribute *attr, char *buf)
1961 {
1962         struct Scsi_Host *shost = transport_class_to_shost(dev);
1963         struct fc_internal *i = to_fc_internal(shost->transportt);
1964
1965         if (i->f->get_host_speed)
1966                 i->f->get_host_speed(shost);
1967
1968         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1969                 return snprintf(buf, 20, "unknown\n");
1970
1971         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1972 }
1973 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1974                 show_fc_host_speed, NULL);
1975
1976
1977 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1978 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1979 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1980 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1981 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1982
1983 fc_private_host_show_function(system_hostname, "%s\n",
1984                 FC_SYMBOLIC_NAME_SIZE + 1, )
1985 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1986 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1987                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1988
1989
1990 /* Private Host Attributes */
1991
1992 static ssize_t
1993 show_fc_private_host_tgtid_bind_type(struct device *dev,
1994                                      struct device_attribute *attr, char *buf)
1995 {
1996         struct Scsi_Host *shost = transport_class_to_shost(dev);
1997         const char *name;
1998
1999         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
2000         if (!name)
2001                 return -EINVAL;
2002         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
2003 }
2004
2005 #define get_list_head_entry(pos, head, member)          \
2006         pos = list_entry((head)->next, typeof(*pos), member)
2007
2008 static ssize_t
2009 store_fc_private_host_tgtid_bind_type(struct device *dev,
2010         struct device_attribute *attr, const char *buf, size_t count)
2011 {
2012         struct Scsi_Host *shost = transport_class_to_shost(dev);
2013         struct fc_rport *rport;
2014         enum fc_tgtid_binding_type val;
2015         unsigned long flags;
2016
2017         if (get_fc_tgtid_bind_type_match(buf, &val))
2018                 return -EINVAL;
2019
2020         /* if changing bind type, purge all unused consistent bindings */
2021         if (val != fc_host_tgtid_bind_type(shost)) {
2022                 spin_lock_irqsave(shost->host_lock, flags);
2023                 while (!list_empty(&fc_host_rport_bindings(shost))) {
2024                         get_list_head_entry(rport,
2025                                 &fc_host_rport_bindings(shost), peers);
2026                         list_del(&rport->peers);
2027                         rport->port_state = FC_PORTSTATE_DELETED;
2028                         fc_queue_work(shost, &rport->rport_delete_work);
2029                 }
2030                 spin_unlock_irqrestore(shost->host_lock, flags);
2031         }
2032
2033         fc_host_tgtid_bind_type(shost) = val;
2034         return count;
2035 }
2036
2037 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
2038                         show_fc_private_host_tgtid_bind_type,
2039                         store_fc_private_host_tgtid_bind_type);
2040
2041 static ssize_t
2042 store_fc_private_host_issue_lip(struct device *dev,
2043         struct device_attribute *attr, const char *buf, size_t count)
2044 {
2045         struct Scsi_Host *shost = transport_class_to_shost(dev);
2046         struct fc_internal *i = to_fc_internal(shost->transportt);
2047         int ret;
2048
2049         /* ignore any data value written to the attribute */
2050         if (i->f->issue_fc_host_lip) {
2051                 ret = i->f->issue_fc_host_lip(shost);
2052                 return ret ? ret: count;
2053         }
2054
2055         return -ENOENT;
2056 }
2057
2058 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
2059                         store_fc_private_host_issue_lip);
2060
2061 static ssize_t
2062 store_fc_private_host_dev_loss_tmo(struct device *dev,
2063                                    struct device_attribute *attr,
2064                                    const char *buf, size_t count)
2065 {
2066         struct Scsi_Host *shost = transport_class_to_shost(dev);
2067         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2068         struct fc_rport *rport;
2069         unsigned long val, flags;
2070         int rc;
2071
2072         rc = fc_str_to_dev_loss(buf, &val);
2073         if (rc)
2074                 return rc;
2075
2076         fc_host_dev_loss_tmo(shost) = val;
2077         spin_lock_irqsave(shost->host_lock, flags);
2078         list_for_each_entry(rport, &fc_host->rports, peers)
2079                 fc_rport_set_dev_loss_tmo(rport, val);
2080         spin_unlock_irqrestore(shost->host_lock, flags);
2081         return count;
2082 }
2083
2084 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
2085 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
2086                       show_fc_host_dev_loss_tmo,
2087                       store_fc_private_host_dev_loss_tmo);
2088
2089 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
2090
2091 /*
2092  * Host Statistics Management
2093  */
2094
2095 /* Show a given attribute in the statistics group */
2096 static ssize_t
2097 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
2098 {
2099         struct Scsi_Host *shost = transport_class_to_shost(dev);
2100         struct fc_internal *i = to_fc_internal(shost->transportt);
2101         struct fc_host_statistics *stats;
2102         ssize_t ret = -ENOENT;
2103
2104         if (offset > sizeof(struct fc_host_statistics) ||
2105             offset % sizeof(u64) != 0)
2106                 WARN_ON(1);
2107
2108         if (i->f->get_fc_host_stats) {
2109                 stats = (i->f->get_fc_host_stats)(shost);
2110                 if (stats)
2111                         ret = snprintf(buf, 20, "0x%llx\n",
2112                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
2113         }
2114         return ret;
2115 }
2116
2117
2118 /* generate a read-only statistics attribute */
2119 #define fc_host_statistic(name)                                         \
2120 static ssize_t show_fcstat_##name(struct device *cd,                    \
2121                                   struct device_attribute *attr,        \
2122                                   char *buf)                            \
2123 {                                                                       \
2124         return fc_stat_show(cd, buf,                                    \
2125                             offsetof(struct fc_host_statistics, name)); \
2126 }                                                                       \
2127 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
2128
2129 fc_host_statistic(seconds_since_last_reset);
2130 fc_host_statistic(tx_frames);
2131 fc_host_statistic(tx_words);
2132 fc_host_statistic(rx_frames);
2133 fc_host_statistic(rx_words);
2134 fc_host_statistic(lip_count);
2135 fc_host_statistic(nos_count);
2136 fc_host_statistic(error_frames);
2137 fc_host_statistic(dumped_frames);
2138 fc_host_statistic(link_failure_count);
2139 fc_host_statistic(loss_of_sync_count);
2140 fc_host_statistic(loss_of_signal_count);
2141 fc_host_statistic(prim_seq_protocol_err_count);
2142 fc_host_statistic(invalid_tx_word_count);
2143 fc_host_statistic(invalid_crc_count);
2144 fc_host_statistic(fcp_input_requests);
2145 fc_host_statistic(fcp_output_requests);
2146 fc_host_statistic(fcp_control_requests);
2147 fc_host_statistic(fcp_input_megabytes);
2148 fc_host_statistic(fcp_output_megabytes);
2149 fc_host_statistic(fcp_packet_alloc_failures);
2150 fc_host_statistic(fcp_packet_aborts);
2151 fc_host_statistic(fcp_frame_alloc_failures);
2152 fc_host_statistic(fc_no_free_exch);
2153 fc_host_statistic(fc_no_free_exch_xid);
2154 fc_host_statistic(fc_xid_not_found);
2155 fc_host_statistic(fc_xid_busy);
2156 fc_host_statistic(fc_seq_not_found);
2157 fc_host_statistic(fc_non_bls_resp);
2158 fc_host_statistic(cn_sig_warn);
2159 fc_host_statistic(cn_sig_alarm);
2160
2161
2162 #define fc_host_fpin_statistic(name)                                    \
2163 static ssize_t fc_host_fpinstat_##name(struct device *cd,               \
2164                                   struct device_attribute *attr,        \
2165                                   char *buf)                            \
2166 {                                                                       \
2167         struct Scsi_Host *shost = transport_class_to_shost(cd);         \
2168         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);        \
2169                                                                         \
2170         return snprintf(buf, 20, "0x%llx\n", fc_host->fpin_stats.name); \
2171 }                                                                       \
2172 static FC_DEVICE_ATTR(host, fpin_##name, 0444, fc_host_fpinstat_##name, NULL)
2173
2174 fc_host_fpin_statistic(dn);
2175 fc_host_fpin_statistic(dn_unknown);
2176 fc_host_fpin_statistic(dn_timeout);
2177 fc_host_fpin_statistic(dn_unable_to_route);
2178 fc_host_fpin_statistic(dn_device_specific);
2179 fc_host_fpin_statistic(cn);
2180 fc_host_fpin_statistic(cn_clear);
2181 fc_host_fpin_statistic(cn_lost_credit);
2182 fc_host_fpin_statistic(cn_credit_stall);
2183 fc_host_fpin_statistic(cn_oversubscription);
2184 fc_host_fpin_statistic(cn_device_specific);
2185 fc_host_fpin_statistic(li);
2186 fc_host_fpin_statistic(li_failure_unknown);
2187 fc_host_fpin_statistic(li_link_failure_count);
2188 fc_host_fpin_statistic(li_loss_of_sync_count);
2189 fc_host_fpin_statistic(li_loss_of_signals_count);
2190 fc_host_fpin_statistic(li_prim_seq_err_count);
2191 fc_host_fpin_statistic(li_invalid_tx_word_count);
2192 fc_host_fpin_statistic(li_invalid_crc_count);
2193 fc_host_fpin_statistic(li_device_specific);
2194
2195 static ssize_t
2196 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
2197                     const char *buf, size_t count)
2198 {
2199         struct Scsi_Host *shost = transport_class_to_shost(dev);
2200         struct fc_internal *i = to_fc_internal(shost->transportt);
2201
2202         /* ignore any data value written to the attribute */
2203         if (i->f->reset_fc_host_stats) {
2204                 i->f->reset_fc_host_stats(shost);
2205                 return count;
2206         }
2207
2208         return -ENOENT;
2209 }
2210 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
2211                                 fc_reset_statistics);
2212
2213 static struct attribute *fc_statistics_attrs[] = {
2214         &device_attr_host_seconds_since_last_reset.attr,
2215         &device_attr_host_tx_frames.attr,
2216         &device_attr_host_tx_words.attr,
2217         &device_attr_host_rx_frames.attr,
2218         &device_attr_host_rx_words.attr,
2219         &device_attr_host_lip_count.attr,
2220         &device_attr_host_nos_count.attr,
2221         &device_attr_host_error_frames.attr,
2222         &device_attr_host_dumped_frames.attr,
2223         &device_attr_host_link_failure_count.attr,
2224         &device_attr_host_loss_of_sync_count.attr,
2225         &device_attr_host_loss_of_signal_count.attr,
2226         &device_attr_host_prim_seq_protocol_err_count.attr,
2227         &device_attr_host_invalid_tx_word_count.attr,
2228         &device_attr_host_invalid_crc_count.attr,
2229         &device_attr_host_fcp_input_requests.attr,
2230         &device_attr_host_fcp_output_requests.attr,
2231         &device_attr_host_fcp_control_requests.attr,
2232         &device_attr_host_fcp_input_megabytes.attr,
2233         &device_attr_host_fcp_output_megabytes.attr,
2234         &device_attr_host_fcp_packet_alloc_failures.attr,
2235         &device_attr_host_fcp_packet_aborts.attr,
2236         &device_attr_host_fcp_frame_alloc_failures.attr,
2237         &device_attr_host_fc_no_free_exch.attr,
2238         &device_attr_host_fc_no_free_exch_xid.attr,
2239         &device_attr_host_fc_xid_not_found.attr,
2240         &device_attr_host_fc_xid_busy.attr,
2241         &device_attr_host_fc_seq_not_found.attr,
2242         &device_attr_host_fc_non_bls_resp.attr,
2243         &device_attr_host_cn_sig_warn.attr,
2244         &device_attr_host_cn_sig_alarm.attr,
2245         &device_attr_host_reset_statistics.attr,
2246         &device_attr_host_fpin_dn.attr,
2247         &device_attr_host_fpin_dn_unknown.attr,
2248         &device_attr_host_fpin_dn_timeout.attr,
2249         &device_attr_host_fpin_dn_unable_to_route.attr,
2250         &device_attr_host_fpin_dn_device_specific.attr,
2251         &device_attr_host_fpin_li.attr,
2252         &device_attr_host_fpin_li_failure_unknown.attr,
2253         &device_attr_host_fpin_li_link_failure_count.attr,
2254         &device_attr_host_fpin_li_loss_of_sync_count.attr,
2255         &device_attr_host_fpin_li_loss_of_signals_count.attr,
2256         &device_attr_host_fpin_li_prim_seq_err_count.attr,
2257         &device_attr_host_fpin_li_invalid_tx_word_count.attr,
2258         &device_attr_host_fpin_li_invalid_crc_count.attr,
2259         &device_attr_host_fpin_li_device_specific.attr,
2260         &device_attr_host_fpin_cn.attr,
2261         &device_attr_host_fpin_cn_clear.attr,
2262         &device_attr_host_fpin_cn_lost_credit.attr,
2263         &device_attr_host_fpin_cn_credit_stall.attr,
2264         &device_attr_host_fpin_cn_oversubscription.attr,
2265         &device_attr_host_fpin_cn_device_specific.attr,
2266         NULL
2267 };
2268
2269 static struct attribute_group fc_statistics_group = {
2270         .name = "statistics",
2271         .attrs = fc_statistics_attrs,
2272 };
2273
2274
2275 /* Host Vport Attributes */
2276
2277 static int
2278 fc_parse_wwn(const char *ns, u64 *nm)
2279 {
2280         unsigned int i, j;
2281         u8 wwn[8];
2282
2283         memset(wwn, 0, sizeof(wwn));
2284
2285         /* Validate and store the new name */
2286         for (i=0, j=0; i < 16; i++) {
2287                 int value;
2288
2289                 value = hex_to_bin(*ns++);
2290                 if (value >= 0)
2291                         j = (j << 4) | value;
2292                 else
2293                         return -EINVAL;
2294                 if (i % 2) {
2295                         wwn[i/2] = j & 0xff;
2296                         j = 0;
2297                 }
2298         }
2299
2300         *nm = wwn_to_u64(wwn);
2301
2302         return 0;
2303 }
2304
2305
2306 /*
2307  * "Short-cut" sysfs variable to create a new vport on a FC Host.
2308  * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
2309  * will default to a NPIV-based FCP_Initiator; The WWNs are specified
2310  * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
2311  */
2312 static ssize_t
2313 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
2314                            const char *buf, size_t count)
2315 {
2316         struct Scsi_Host *shost = transport_class_to_shost(dev);
2317         struct fc_vport_identifiers vid;
2318         struct fc_vport *vport;
2319         unsigned int cnt=count;
2320         int stat;
2321
2322         memset(&vid, 0, sizeof(vid));
2323
2324         /* count may include a LF at end of string */
2325         if (buf[cnt-1] == '\n')
2326                 cnt--;
2327
2328         /* validate we have enough characters for WWPN */
2329         if ((cnt != (16+1+16)) || (buf[16] != ':'))
2330                 return -EINVAL;
2331
2332         stat = fc_parse_wwn(&buf[0], &vid.port_name);
2333         if (stat)
2334                 return stat;
2335
2336         stat = fc_parse_wwn(&buf[17], &vid.node_name);
2337         if (stat)
2338                 return stat;
2339
2340         vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
2341         vid.vport_type = FC_PORTTYPE_NPIV;
2342         /* vid.symbolic_name is already zero/NULL's */
2343         vid.disable = false;            /* always enabled */
2344
2345         /* we only allow support on Channel 0 !!! */
2346         stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
2347         return stat ? stat : count;
2348 }
2349 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
2350                         store_fc_host_vport_create);
2351
2352
2353 /*
2354  * "Short-cut" sysfs variable to delete a vport on a FC Host.
2355  * Vport is identified by a string containing "<WWPN>:<WWNN>".
2356  * The WWNs are specified as hex characters, and may *not* contain
2357  * any prefixes (e.g. 0x, x, etc)
2358  */
2359 static ssize_t
2360 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
2361                            const char *buf, size_t count)
2362 {
2363         struct Scsi_Host *shost = transport_class_to_shost(dev);
2364         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2365         struct fc_vport *vport;
2366         u64 wwpn, wwnn;
2367         unsigned long flags;
2368         unsigned int cnt=count;
2369         int stat, match;
2370
2371         /* count may include a LF at end of string */
2372         if (buf[cnt-1] == '\n')
2373                 cnt--;
2374
2375         /* validate we have enough characters for WWPN */
2376         if ((cnt != (16+1+16)) || (buf[16] != ':'))
2377                 return -EINVAL;
2378
2379         stat = fc_parse_wwn(&buf[0], &wwpn);
2380         if (stat)
2381                 return stat;
2382
2383         stat = fc_parse_wwn(&buf[17], &wwnn);
2384         if (stat)
2385                 return stat;
2386
2387         spin_lock_irqsave(shost->host_lock, flags);
2388         match = 0;
2389         /* we only allow support on Channel 0 !!! */
2390         list_for_each_entry(vport, &fc_host->vports, peers) {
2391                 if ((vport->channel == 0) &&
2392                     (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
2393                         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
2394                                 break;
2395                         vport->flags |= FC_VPORT_DELETING;
2396                         match = 1;
2397                         break;
2398                 }
2399         }
2400         spin_unlock_irqrestore(shost->host_lock, flags);
2401
2402         if (!match)
2403                 return -ENODEV;
2404
2405         stat = fc_vport_terminate(vport);
2406         return stat ? stat : count;
2407 }
2408 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
2409                         store_fc_host_vport_delete);
2410
2411
2412 static int fc_host_match(struct attribute_container *cont,
2413                           struct device *dev)
2414 {
2415         struct Scsi_Host *shost;
2416         struct fc_internal *i;
2417
2418         if (!scsi_is_host_device(dev))
2419                 return 0;
2420
2421         shost = dev_to_shost(dev);
2422         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2423             != &fc_host_class.class)
2424                 return 0;
2425
2426         i = to_fc_internal(shost->transportt);
2427
2428         return &i->t.host_attrs.ac == cont;
2429 }
2430
2431 static int fc_target_match(struct attribute_container *cont,
2432                             struct device *dev)
2433 {
2434         struct Scsi_Host *shost;
2435         struct fc_internal *i;
2436
2437         if (!scsi_is_target_device(dev))
2438                 return 0;
2439
2440         shost = dev_to_shost(dev->parent);
2441         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2442             != &fc_host_class.class)
2443                 return 0;
2444
2445         i = to_fc_internal(shost->transportt);
2446
2447         return &i->t.target_attrs.ac == cont;
2448 }
2449
2450 static void fc_rport_dev_release(struct device *dev)
2451 {
2452         struct fc_rport *rport = dev_to_rport(dev);
2453         put_device(dev->parent);
2454         kfree(rport);
2455 }
2456
2457 int scsi_is_fc_rport(const struct device *dev)
2458 {
2459         return dev->release == fc_rport_dev_release;
2460 }
2461 EXPORT_SYMBOL(scsi_is_fc_rport);
2462
2463 static int fc_rport_match(struct attribute_container *cont,
2464                             struct device *dev)
2465 {
2466         struct Scsi_Host *shost;
2467         struct fc_internal *i;
2468
2469         if (!scsi_is_fc_rport(dev))
2470                 return 0;
2471
2472         shost = dev_to_shost(dev->parent);
2473         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2474             != &fc_host_class.class)
2475                 return 0;
2476
2477         i = to_fc_internal(shost->transportt);
2478
2479         return &i->rport_attr_cont.ac == cont;
2480 }
2481
2482
2483 static void fc_vport_dev_release(struct device *dev)
2484 {
2485         struct fc_vport *vport = dev_to_vport(dev);
2486         put_device(dev->parent);                /* release kobj parent */
2487         kfree(vport);
2488 }
2489
2490 static int scsi_is_fc_vport(const struct device *dev)
2491 {
2492         return dev->release == fc_vport_dev_release;
2493 }
2494
2495 static int fc_vport_match(struct attribute_container *cont,
2496                             struct device *dev)
2497 {
2498         struct fc_vport *vport;
2499         struct Scsi_Host *shost;
2500         struct fc_internal *i;
2501
2502         if (!scsi_is_fc_vport(dev))
2503                 return 0;
2504         vport = dev_to_vport(dev);
2505
2506         shost = vport_to_shost(vport);
2507         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2508             != &fc_host_class.class)
2509                 return 0;
2510
2511         i = to_fc_internal(shost->transportt);
2512         return &i->vport_attr_cont.ac == cont;
2513 }
2514
2515
2516 /**
2517  * fc_eh_timed_out - FC Transport I/O timeout intercept handler
2518  * @scmd:       The SCSI command which timed out
2519  *
2520  * This routine protects against error handlers getting invoked while a
2521  * rport is in a blocked state, typically due to a temporarily loss of
2522  * connectivity. If the error handlers are allowed to proceed, requests
2523  * to abort i/o, reset the target, etc will likely fail as there is no way
2524  * to communicate with the device to perform the requested function. These
2525  * failures may result in the midlayer taking the device offline, requiring
2526  * manual intervention to restore operation.
2527  *
2528  * This routine, called whenever an i/o times out, validates the state of
2529  * the underlying rport. If the rport is blocked, it returns
2530  * EH_RESET_TIMER, which will continue to reschedule the timeout.
2531  * Eventually, either the device will return, or devloss_tmo will fire,
2532  * and when the timeout then fires, it will be handled normally.
2533  * If the rport is not blocked, normal error handling continues.
2534  *
2535  * Notes:
2536  *      This routine assumes no locks are held on entry.
2537  */
2538 enum blk_eh_timer_return
2539 fc_eh_timed_out(struct scsi_cmnd *scmd)
2540 {
2541         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2542
2543         if (rport->port_state == FC_PORTSTATE_BLOCKED)
2544                 return BLK_EH_RESET_TIMER;
2545
2546         return BLK_EH_DONE;
2547 }
2548 EXPORT_SYMBOL(fc_eh_timed_out);
2549
2550 /*
2551  * Called by fc_user_scan to locate an rport on the shost that
2552  * matches the channel and target id, and invoke scsi_scan_target()
2553  * on the rport.
2554  */
2555 static void
2556 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2557 {
2558         struct fc_rport *rport;
2559         unsigned long flags;
2560
2561         spin_lock_irqsave(shost->host_lock, flags);
2562
2563         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2564                 if (rport->scsi_target_id == -1)
2565                         continue;
2566
2567                 if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
2568                         (rport->port_state != FC_PORTSTATE_MARGINAL))
2569                         continue;
2570
2571                 if ((channel == rport->channel) &&
2572                     (id == rport->scsi_target_id)) {
2573                         spin_unlock_irqrestore(shost->host_lock, flags);
2574                         scsi_scan_target(&rport->dev, channel, id, lun,
2575                                          SCSI_SCAN_MANUAL);
2576                         return;
2577                 }
2578         }
2579
2580         spin_unlock_irqrestore(shost->host_lock, flags);
2581 }
2582
2583 /*
2584  * Called via sysfs scan routines. Necessary, as the FC transport
2585  * wants to place all target objects below the rport object. So this
2586  * routine must invoke the scsi_scan_target() routine with the rport
2587  * object as the parent.
2588  */
2589 static int
2590 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2591 {
2592         uint chlo, chhi;
2593         uint tgtlo, tgthi;
2594
2595         if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2596             ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2597             ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2598                 return -EINVAL;
2599
2600         if (channel == SCAN_WILD_CARD) {
2601                 chlo = 0;
2602                 chhi = shost->max_channel + 1;
2603         } else {
2604                 chlo = channel;
2605                 chhi = channel + 1;
2606         }
2607
2608         if (id == SCAN_WILD_CARD) {
2609                 tgtlo = 0;
2610                 tgthi = shost->max_id;
2611         } else {
2612                 tgtlo = id;
2613                 tgthi = id + 1;
2614         }
2615
2616         for ( ; chlo < chhi; chlo++)
2617                 for ( ; tgtlo < tgthi; tgtlo++)
2618                         fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2619
2620         return 0;
2621 }
2622
2623 struct scsi_transport_template *
2624 fc_attach_transport(struct fc_function_template *ft)
2625 {
2626         int count;
2627         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2628                                         GFP_KERNEL);
2629
2630         if (unlikely(!i))
2631                 return NULL;
2632
2633         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2634         i->t.target_attrs.ac.class = &fc_transport_class.class;
2635         i->t.target_attrs.ac.match = fc_target_match;
2636         i->t.target_size = sizeof(struct fc_starget_attrs);
2637         transport_container_register(&i->t.target_attrs);
2638
2639         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2640         i->t.host_attrs.ac.class = &fc_host_class.class;
2641         i->t.host_attrs.ac.match = fc_host_match;
2642         i->t.host_size = sizeof(struct fc_host_attrs);
2643         if (ft->get_fc_host_stats)
2644                 i->t.host_attrs.statistics = &fc_statistics_group;
2645         transport_container_register(&i->t.host_attrs);
2646
2647         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2648         i->rport_attr_cont.ac.class = &fc_rport_class.class;
2649         i->rport_attr_cont.ac.match = fc_rport_match;
2650         i->rport_attr_cont.statistics = &fc_rport_statistics_group;
2651         transport_container_register(&i->rport_attr_cont);
2652
2653         i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2654         i->vport_attr_cont.ac.class = &fc_vport_class.class;
2655         i->vport_attr_cont.ac.match = fc_vport_match;
2656         transport_container_register(&i->vport_attr_cont);
2657
2658         i->f = ft;
2659
2660         /* Transport uses the shost workq for scsi scanning */
2661         i->t.create_work_queue = 1;
2662
2663         i->t.user_scan = fc_user_scan;
2664
2665         /*
2666          * Setup SCSI Target Attributes.
2667          */
2668         count = 0;
2669         SETUP_STARGET_ATTRIBUTE_RD(node_name);
2670         SETUP_STARGET_ATTRIBUTE_RD(port_name);
2671         SETUP_STARGET_ATTRIBUTE_RD(port_id);
2672
2673         BUG_ON(count > FC_STARGET_NUM_ATTRS);
2674
2675         i->starget_attrs[count] = NULL;
2676
2677
2678         /*
2679          * Setup SCSI Host Attributes.
2680          */
2681         count=0;
2682         SETUP_HOST_ATTRIBUTE_RD(node_name);
2683         SETUP_HOST_ATTRIBUTE_RD(port_name);
2684         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2685         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2686         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2687         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2688         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2689         if (ft->vport_create) {
2690                 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2691                 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2692         }
2693         SETUP_HOST_ATTRIBUTE_RD(serial_number);
2694         SETUP_HOST_ATTRIBUTE_RD(manufacturer);
2695         SETUP_HOST_ATTRIBUTE_RD(model);
2696         SETUP_HOST_ATTRIBUTE_RD(model_description);
2697         SETUP_HOST_ATTRIBUTE_RD(hardware_version);
2698         SETUP_HOST_ATTRIBUTE_RD(driver_version);
2699         SETUP_HOST_ATTRIBUTE_RD(firmware_version);
2700         SETUP_HOST_ATTRIBUTE_RD(optionrom_version);
2701
2702         SETUP_HOST_ATTRIBUTE_RD(port_id);
2703         SETUP_HOST_ATTRIBUTE_RD(port_type);
2704         SETUP_HOST_ATTRIBUTE_RD(port_state);
2705         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2706         SETUP_HOST_ATTRIBUTE_RD(speed);
2707         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2708         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2709         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2710
2711         /* Transport-managed attributes */
2712         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2713         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2714         if (ft->issue_fc_host_lip)
2715                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2716         if (ft->vport_create)
2717                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2718         if (ft->vport_delete)
2719                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2720
2721         BUG_ON(count > FC_HOST_NUM_ATTRS);
2722
2723         i->host_attrs[count] = NULL;
2724
2725         /*
2726          * Setup Remote Port Attributes.
2727          */
2728         count=0;
2729         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2730         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2731         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2732         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2733         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2734         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2735         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2736         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(port_state);
2737         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2738         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2739
2740         BUG_ON(count > FC_RPORT_NUM_ATTRS);
2741
2742         i->rport_attrs[count] = NULL;
2743
2744         /*
2745          * Setup Virtual Port Attributes.
2746          */
2747         count=0;
2748         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2749         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2750         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2751         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2752         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2753         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2754         SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2755         SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2756         SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2757
2758         BUG_ON(count > FC_VPORT_NUM_ATTRS);
2759
2760         i->vport_attrs[count] = NULL;
2761
2762         return &i->t;
2763 }
2764 EXPORT_SYMBOL(fc_attach_transport);
2765
2766 void fc_release_transport(struct scsi_transport_template *t)
2767 {
2768         struct fc_internal *i = to_fc_internal(t);
2769
2770         transport_container_unregister(&i->t.target_attrs);
2771         transport_container_unregister(&i->t.host_attrs);
2772         transport_container_unregister(&i->rport_attr_cont);
2773         transport_container_unregister(&i->vport_attr_cont);
2774
2775         kfree(i);
2776 }
2777 EXPORT_SYMBOL(fc_release_transport);
2778
2779 /**
2780  * fc_queue_work - Queue work to the fc_host workqueue.
2781  * @shost:      Pointer to Scsi_Host bound to fc_host.
2782  * @work:       Work to queue for execution.
2783  *
2784  * Return value:
2785  *      1 - work queued for execution
2786  *      0 - work is already queued
2787  *      -EINVAL - work queue doesn't exist
2788  */
2789 static int
2790 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2791 {
2792         if (unlikely(!fc_host_work_q(shost))) {
2793                 printk(KERN_ERR
2794                         "ERROR: FC host '%s' attempted to queue work, "
2795                         "when no workqueue created.\n", shost->hostt->name);
2796                 dump_stack();
2797
2798                 return -EINVAL;
2799         }
2800
2801         return queue_work(fc_host_work_q(shost), work);
2802 }
2803
2804 /**
2805  * fc_flush_work - Flush a fc_host's workqueue.
2806  * @shost:      Pointer to Scsi_Host bound to fc_host.
2807  */
2808 static void
2809 fc_flush_work(struct Scsi_Host *shost)
2810 {
2811         if (!fc_host_work_q(shost)) {
2812                 printk(KERN_ERR
2813                         "ERROR: FC host '%s' attempted to flush work, "
2814                         "when no workqueue created.\n", shost->hostt->name);
2815                 dump_stack();
2816                 return;
2817         }
2818
2819         flush_workqueue(fc_host_work_q(shost));
2820 }
2821
2822 /**
2823  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2824  * @shost:      Pointer to Scsi_Host bound to fc_host.
2825  * @work:       Work to queue for execution.
2826  * @delay:      jiffies to delay the work queuing
2827  *
2828  * Return value:
2829  *      1 on success / 0 already queued / < 0 for error
2830  */
2831 static int
2832 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2833                                 unsigned long delay)
2834 {
2835         if (unlikely(!fc_host_devloss_work_q(shost))) {
2836                 printk(KERN_ERR
2837                         "ERROR: FC host '%s' attempted to queue work, "
2838                         "when no workqueue created.\n", shost->hostt->name);
2839                 dump_stack();
2840
2841                 return -EINVAL;
2842         }
2843
2844         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2845 }
2846
2847 /**
2848  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2849  * @shost:      Pointer to Scsi_Host bound to fc_host.
2850  */
2851 static void
2852 fc_flush_devloss(struct Scsi_Host *shost)
2853 {
2854         if (!fc_host_devloss_work_q(shost)) {
2855                 printk(KERN_ERR
2856                         "ERROR: FC host '%s' attempted to flush work, "
2857                         "when no workqueue created.\n", shost->hostt->name);
2858                 dump_stack();
2859                 return;
2860         }
2861
2862         flush_workqueue(fc_host_devloss_work_q(shost));
2863 }
2864
2865
2866 /**
2867  * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2868  * @shost:      Which &Scsi_Host
2869  *
2870  * This routine is expected to be called immediately preceding the
2871  * a driver's call to scsi_remove_host().
2872  *
2873  * WARNING: A driver utilizing the fc_transport, which fails to call
2874  *   this routine prior to scsi_remove_host(), will leave dangling
2875  *   objects in /sys/class/fc_remote_ports. Access to any of these
2876  *   objects can result in a system crash !!!
2877  *
2878  * Notes:
2879  *      This routine assumes no locks are held on entry.
2880  */
2881 void
2882 fc_remove_host(struct Scsi_Host *shost)
2883 {
2884         struct fc_vport *vport = NULL, *next_vport = NULL;
2885         struct fc_rport *rport = NULL, *next_rport = NULL;
2886         struct workqueue_struct *work_q;
2887         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2888         unsigned long flags;
2889
2890         spin_lock_irqsave(shost->host_lock, flags);
2891
2892         /* Remove any vports */
2893         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2894                 vport->flags |= FC_VPORT_DELETING;
2895                 fc_queue_work(shost, &vport->vport_delete_work);
2896         }
2897
2898         /* Remove any remote ports */
2899         list_for_each_entry_safe(rport, next_rport,
2900                         &fc_host->rports, peers) {
2901                 list_del(&rport->peers);
2902                 rport->port_state = FC_PORTSTATE_DELETED;
2903                 fc_queue_work(shost, &rport->rport_delete_work);
2904         }
2905
2906         list_for_each_entry_safe(rport, next_rport,
2907                         &fc_host->rport_bindings, peers) {
2908                 list_del(&rport->peers);
2909                 rport->port_state = FC_PORTSTATE_DELETED;
2910                 fc_queue_work(shost, &rport->rport_delete_work);
2911         }
2912
2913         spin_unlock_irqrestore(shost->host_lock, flags);
2914
2915         /* flush all scan work items */
2916         scsi_flush_work(shost);
2917
2918         /* flush all stgt delete, and rport delete work items, then kill it  */
2919         if (fc_host->work_q) {
2920                 work_q = fc_host->work_q;
2921                 fc_host->work_q = NULL;
2922                 destroy_workqueue(work_q);
2923         }
2924
2925         /* flush all devloss work items, then kill it  */
2926         if (fc_host->devloss_work_q) {
2927                 work_q = fc_host->devloss_work_q;
2928                 fc_host->devloss_work_q = NULL;
2929                 destroy_workqueue(work_q);
2930         }
2931 }
2932 EXPORT_SYMBOL(fc_remove_host);
2933
2934 static void fc_terminate_rport_io(struct fc_rport *rport)
2935 {
2936         struct Scsi_Host *shost = rport_to_shost(rport);
2937         struct fc_internal *i = to_fc_internal(shost->transportt);
2938
2939         /* Involve the LLDD if possible to terminate all io on the rport. */
2940         if (i->f->terminate_rport_io)
2941                 i->f->terminate_rport_io(rport);
2942
2943         /*
2944          * Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
2945          */
2946         scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
2947 }
2948
2949 /**
2950  * fc_starget_delete - called to delete the scsi descendants of an rport
2951  * @work:       remote port to be operated on.
2952  *
2953  * Deletes target and all sdevs.
2954  */
2955 static void
2956 fc_starget_delete(struct work_struct *work)
2957 {
2958         struct fc_rport *rport =
2959                 container_of(work, struct fc_rport, stgt_delete_work);
2960
2961         fc_terminate_rport_io(rport);
2962         scsi_remove_target(&rport->dev);
2963 }
2964
2965
2966 /**
2967  * fc_rport_final_delete - finish rport termination and delete it.
2968  * @work:       remote port to be deleted.
2969  */
2970 static void
2971 fc_rport_final_delete(struct work_struct *work)
2972 {
2973         struct fc_rport *rport =
2974                 container_of(work, struct fc_rport, rport_delete_work);
2975         struct device *dev = &rport->dev;
2976         struct Scsi_Host *shost = rport_to_shost(rport);
2977         struct fc_internal *i = to_fc_internal(shost->transportt);
2978         unsigned long flags;
2979         int do_callback = 0;
2980
2981         fc_terminate_rport_io(rport);
2982
2983         /*
2984          * if a scan is pending, flush the SCSI Host work_q so that
2985          * that we can reclaim the rport scan work element.
2986          */
2987         if (rport->flags & FC_RPORT_SCAN_PENDING)
2988                 scsi_flush_work(shost);
2989
2990         /*
2991          * Cancel any outstanding timers. These should really exist
2992          * only when rmmod'ing the LLDD and we're asking for
2993          * immediate termination of the rports
2994          */
2995         spin_lock_irqsave(shost->host_lock, flags);
2996         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2997                 spin_unlock_irqrestore(shost->host_lock, flags);
2998                 if (!cancel_delayed_work(&rport->fail_io_work))
2999                         fc_flush_devloss(shost);
3000                 if (!cancel_delayed_work(&rport->dev_loss_work))
3001                         fc_flush_devloss(shost);
3002                 cancel_work_sync(&rport->scan_work);
3003                 spin_lock_irqsave(shost->host_lock, flags);
3004                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3005         }
3006         spin_unlock_irqrestore(shost->host_lock, flags);
3007
3008         /* Delete SCSI target and sdevs */
3009         if (rport->scsi_target_id != -1)
3010                 fc_starget_delete(&rport->stgt_delete_work);
3011
3012         /*
3013          * Notify the driver that the rport is now dead. The LLDD will
3014          * also guarantee that any communication to the rport is terminated
3015          *
3016          * Avoid this call if we already called it when we preserved the
3017          * rport for the binding.
3018          */
3019         spin_lock_irqsave(shost->host_lock, flags);
3020         if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
3021             (i->f->dev_loss_tmo_callbk)) {
3022                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3023                 do_callback = 1;
3024         }
3025         spin_unlock_irqrestore(shost->host_lock, flags);
3026
3027         if (do_callback)
3028                 i->f->dev_loss_tmo_callbk(rport);
3029
3030         fc_bsg_remove(rport->rqst_q);
3031
3032         transport_remove_device(dev);
3033         device_del(dev);
3034         transport_destroy_device(dev);
3035         scsi_host_put(shost);                   /* for fc_host->rport list */
3036         put_device(dev);                        /* for self-reference */
3037 }
3038
3039
3040 /**
3041  * fc_remote_port_create - allocates and creates a remote FC port.
3042  * @shost:      scsi host the remote port is connected to.
3043  * @channel:    Channel on shost port connected to.
3044  * @ids:        The world wide names, fc address, and FC4 port
3045  *              roles for the remote port.
3046  *
3047  * Allocates and creates the remoter port structure, including the
3048  * class and sysfs creation.
3049  *
3050  * Notes:
3051  *      This routine assumes no locks are held on entry.
3052  */
3053 static struct fc_rport *
3054 fc_remote_port_create(struct Scsi_Host *shost, int channel,
3055                       struct fc_rport_identifiers  *ids)
3056 {
3057         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3058         struct fc_internal *fci = to_fc_internal(shost->transportt);
3059         struct fc_rport *rport;
3060         struct device *dev;
3061         unsigned long flags;
3062         int error;
3063         size_t size;
3064
3065         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
3066         rport = kzalloc(size, GFP_KERNEL);
3067         if (unlikely(!rport)) {
3068                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3069                 return NULL;
3070         }
3071
3072         rport->maxframe_size = -1;
3073         rport->supported_classes = FC_COS_UNSPECIFIED;
3074         rport->dev_loss_tmo = fc_host->dev_loss_tmo;
3075         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
3076         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
3077         rport->port_id = ids->port_id;
3078         rport->roles = ids->roles;
3079         rport->port_state = FC_PORTSTATE_ONLINE;
3080         if (fci->f->dd_fcrport_size)
3081                 rport->dd_data = &rport[1];
3082         rport->channel = channel;
3083         rport->fast_io_fail_tmo = -1;
3084
3085         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
3086         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
3087         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
3088         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
3089         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
3090
3091         spin_lock_irqsave(shost->host_lock, flags);
3092
3093         rport->number = fc_host->next_rport_number++;
3094         if ((rport->roles & FC_PORT_ROLE_FCP_TARGET) ||
3095             (rport->roles & FC_PORT_ROLE_FCP_DUMMY_INITIATOR))
3096                 rport->scsi_target_id = fc_host->next_target_id++;
3097         else
3098                 rport->scsi_target_id = -1;
3099         list_add_tail(&rport->peers, &fc_host->rports);
3100         scsi_host_get(shost);                   /* for fc_host->rport list */
3101
3102         spin_unlock_irqrestore(shost->host_lock, flags);
3103
3104         dev = &rport->dev;
3105         device_initialize(dev);                 /* takes self reference */
3106         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
3107         dev->release = fc_rport_dev_release;
3108         dev_set_name(dev, "rport-%d:%d-%d",
3109                      shost->host_no, channel, rport->number);
3110         transport_setup_device(dev);
3111
3112         error = device_add(dev);
3113         if (error) {
3114                 printk(KERN_ERR "FC Remote Port device_add failed\n");
3115                 goto delete_rport;
3116         }
3117         transport_add_device(dev);
3118         transport_configure_device(dev);
3119
3120         fc_bsg_rportadd(shost, rport);
3121         /* ignore any bsg add error - we just can't do sgio */
3122
3123         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
3124                 /* initiate a scan of the target */
3125                 rport->flags |= FC_RPORT_SCAN_PENDING;
3126                 scsi_queue_work(shost, &rport->scan_work);
3127         }
3128
3129         return rport;
3130
3131 delete_rport:
3132         transport_destroy_device(dev);
3133         spin_lock_irqsave(shost->host_lock, flags);
3134         list_del(&rport->peers);
3135         scsi_host_put(shost);                   /* for fc_host->rport list */
3136         spin_unlock_irqrestore(shost->host_lock, flags);
3137         put_device(dev->parent);
3138         kfree(rport);
3139         return NULL;
3140 }
3141
3142 /**
3143  * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
3144  * @shost:      scsi host the remote port is connected to.
3145  * @channel:    Channel on shost port connected to.
3146  * @ids:        The world wide names, fc address, and FC4 port
3147  *              roles for the remote port.
3148  *
3149  * The LLDD calls this routine to notify the transport of the existence
3150  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
3151  * of the port, it's FC address (port_id), and the FC4 roles that are
3152  * active for the port.
3153  *
3154  * For ports that are FCP targets (aka scsi targets), the FC transport
3155  * maintains consistent target id bindings on behalf of the LLDD.
3156  * A consistent target id binding is an assignment of a target id to
3157  * a remote port identifier, which persists while the scsi host is
3158  * attached. The remote port can disappear, then later reappear, and
3159  * it's target id assignment remains the same. This allows for shifts
3160  * in FC addressing (if binding by wwpn or wwnn) with no apparent
3161  * changes to the scsi subsystem which is based on scsi host number and
3162  * target id values.  Bindings are only valid during the attachment of
3163  * the scsi host. If the host detaches, then later re-attaches, target
3164  * id bindings may change.
3165  *
3166  * This routine is responsible for returning a remote port structure.
3167  * The routine will search the list of remote ports it maintains
3168  * internally on behalf of consistent target id mappings. If found, the
3169  * remote port structure will be reused. Otherwise, a new remote port
3170  * structure will be allocated.
3171  *
3172  * Whenever a remote port is allocated, a new fc_remote_port class
3173  * device is created.
3174  *
3175  * Should not be called from interrupt context.
3176  *
3177  * Notes:
3178  *      This routine assumes no locks are held on entry.
3179  */
3180 struct fc_rport *
3181 fc_remote_port_add(struct Scsi_Host *shost, int channel,
3182         struct fc_rport_identifiers  *ids)
3183 {
3184         struct fc_internal *fci = to_fc_internal(shost->transportt);
3185         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3186         struct fc_rport *rport;
3187         unsigned long flags;
3188         int match = 0;
3189
3190         /* ensure any stgt delete functions are done */
3191         fc_flush_work(shost);
3192
3193         /*
3194          * Search the list of "active" rports, for an rport that has been
3195          * deleted, but we've held off the real delete while the target
3196          * is in a "blocked" state.
3197          */
3198         spin_lock_irqsave(shost->host_lock, flags);
3199
3200         list_for_each_entry(rport, &fc_host->rports, peers) {
3201
3202                 if ((rport->port_state == FC_PORTSTATE_BLOCKED ||
3203                      rport->port_state == FC_PORTSTATE_NOTPRESENT) &&
3204                         (rport->channel == channel)) {
3205
3206                         switch (fc_host->tgtid_bind_type) {
3207                         case FC_TGTID_BIND_BY_WWPN:
3208                         case FC_TGTID_BIND_NONE:
3209                                 if (rport->port_name == ids->port_name)
3210                                         match = 1;
3211                                 break;
3212                         case FC_TGTID_BIND_BY_WWNN:
3213                                 if (rport->node_name == ids->node_name)
3214                                         match = 1;
3215                                 break;
3216                         case FC_TGTID_BIND_BY_ID:
3217                                 if (rport->port_id == ids->port_id)
3218                                         match = 1;
3219                                 break;
3220                         }
3221
3222                         if (match) {
3223
3224                                 memcpy(&rport->node_name, &ids->node_name,
3225                                         sizeof(rport->node_name));
3226                                 memcpy(&rport->port_name, &ids->port_name,
3227                                         sizeof(rport->port_name));
3228                                 rport->port_id = ids->port_id;
3229
3230                                 rport->port_state = FC_PORTSTATE_ONLINE;
3231                                 rport->roles = ids->roles;
3232
3233                                 spin_unlock_irqrestore(shost->host_lock, flags);
3234
3235                                 if (fci->f->dd_fcrport_size)
3236                                         memset(rport->dd_data, 0,
3237                                                 fci->f->dd_fcrport_size);
3238
3239                                 /*
3240                                  * If we were not a target, cancel the
3241                                  * io terminate and rport timers, and
3242                                  * we're done.
3243                                  *
3244                                  * If we were a target, but our new role
3245                                  * doesn't indicate a target, leave the
3246                                  * timers running expecting the role to
3247                                  * change as the target fully logs in. If
3248                                  * it doesn't, the target will be torn down.
3249                                  *
3250                                  * If we were a target, and our role shows
3251                                  * we're still a target, cancel the timers
3252                                  * and kick off a scan.
3253                                  */
3254
3255                                 /* was a target, not in roles */
3256                                 if ((rport->scsi_target_id != -1) &&
3257                                     (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
3258                                         return rport;
3259
3260                                 /*
3261                                  * Stop the fail io and dev_loss timers.
3262                                  * If they flush, the port_state will
3263                                  * be checked and will NOOP the function.
3264                                  */
3265                                 if (!cancel_delayed_work(&rport->fail_io_work))
3266                                         fc_flush_devloss(shost);
3267                                 if (!cancel_delayed_work(&rport->dev_loss_work))
3268                                         fc_flush_devloss(shost);
3269
3270                                 spin_lock_irqsave(shost->host_lock, flags);
3271
3272                                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3273                                                   FC_RPORT_DEVLOSS_PENDING |
3274                                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
3275
3276                                 spin_unlock_irqrestore(shost->host_lock, flags);
3277
3278                                 /* if target, initiate a scan */
3279                                 if (rport->scsi_target_id != -1) {
3280                                         scsi_target_unblock(&rport->dev,
3281                                                             SDEV_RUNNING);
3282                                         spin_lock_irqsave(shost->host_lock,
3283                                                           flags);
3284                                         rport->flags |= FC_RPORT_SCAN_PENDING;
3285                                         scsi_queue_work(shost,
3286                                                         &rport->scan_work);
3287                                         spin_unlock_irqrestore(shost->host_lock,
3288                                                         flags);
3289                                 }
3290
3291                                 fc_bsg_goose_queue(rport);
3292
3293                                 return rport;
3294                         }
3295                 }
3296         }
3297
3298         /*
3299          * Search the bindings array
3300          * Note: if never a FCP target, you won't be on this list
3301          */
3302         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
3303
3304                 /* search for a matching consistent binding */
3305
3306                 list_for_each_entry(rport, &fc_host->rport_bindings,
3307                                         peers) {
3308                         if (rport->channel != channel)
3309                                 continue;
3310
3311                         switch (fc_host->tgtid_bind_type) {
3312                         case FC_TGTID_BIND_BY_WWPN:
3313                                 if (rport->port_name == ids->port_name)
3314                                         match = 1;
3315                                 break;
3316                         case FC_TGTID_BIND_BY_WWNN:
3317                                 if (rport->node_name == ids->node_name)
3318                                         match = 1;
3319                                 break;
3320                         case FC_TGTID_BIND_BY_ID:
3321                                 if (rport->port_id == ids->port_id)
3322                                         match = 1;
3323                                 break;
3324                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3325                                 break;
3326                         }
3327
3328                         if (match) {
3329                                 list_move_tail(&rport->peers, &fc_host->rports);
3330                                 break;
3331                         }
3332                 }
3333
3334                 if (match) {
3335                         memcpy(&rport->node_name, &ids->node_name,
3336                                 sizeof(rport->node_name));
3337                         memcpy(&rport->port_name, &ids->port_name,
3338                                 sizeof(rport->port_name));
3339                         rport->port_id = ids->port_id;
3340                         rport->port_state = FC_PORTSTATE_ONLINE;
3341                         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3342
3343                         if (fci->f->dd_fcrport_size)
3344                                 memset(rport->dd_data, 0,
3345                                                 fci->f->dd_fcrport_size);
3346                         spin_unlock_irqrestore(shost->host_lock, flags);
3347
3348                         fc_remote_port_rolechg(rport, ids->roles);
3349                         return rport;
3350                 }
3351         }
3352
3353         spin_unlock_irqrestore(shost->host_lock, flags);
3354
3355         /* No consistent binding found - create new remote port entry */
3356         rport = fc_remote_port_create(shost, channel, ids);
3357
3358         return rport;
3359 }
3360 EXPORT_SYMBOL(fc_remote_port_add);
3361
3362
3363 /**
3364  * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
3365  * @rport:      The remote port that no longer exists
3366  *
3367  * The LLDD calls this routine to notify the transport that a remote
3368  * port is no longer part of the topology. Note: Although a port
3369  * may no longer be part of the topology, it may persist in the remote
3370  * ports displayed by the fc_host. We do this under 2 conditions:
3371  *
3372  * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
3373  *    This allows the port to temporarily disappear, then reappear without
3374  *    disrupting the SCSI device tree attached to it. During the "blocked"
3375  *    period the port will still exist.
3376  *
3377  * 2) If the port was a scsi target and disappears for longer than we
3378  *    expect, we'll delete the port and the tear down the SCSI device tree
3379  *    attached to it. However, we want to semi-persist the target id assigned
3380  *    to that port if it eventually does exist. The port structure will
3381  *    remain (although with minimal information) so that the target id
3382  *    bindings also remain.
3383  *
3384  * If the remote port is not an FCP Target, it will be fully torn down
3385  * and deallocated, including the fc_remote_port class device.
3386  *
3387  * If the remote port is an FCP Target, the port will be placed in a
3388  * temporary blocked state. From the LLDD's perspective, the rport no
3389  * longer exists. From the SCSI midlayer's perspective, the SCSI target
3390  * exists, but all sdevs on it are blocked from further I/O. The following
3391  * is then expected.
3392  *
3393  *   If the remote port does not return (signaled by a LLDD call to
3394  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
3395  *   scsi target is removed - killing all outstanding i/o and removing the
3396  *   scsi devices attached to it. The port structure will be marked Not
3397  *   Present and be partially cleared, leaving only enough information to
3398  *   recognize the remote port relative to the scsi target id binding if
3399  *   it later appears.  The port will remain as long as there is a valid
3400  *   binding (e.g. until the user changes the binding type or unloads the
3401  *   scsi host with the binding).
3402  *
3403  *   If the remote port returns within the dev_loss_tmo value (and matches
3404  *   according to the target id binding type), the port structure will be
3405  *   reused. If it is no longer a SCSI target, the target will be torn
3406  *   down. If it continues to be a SCSI target, then the target will be
3407  *   unblocked (allowing i/o to be resumed), and a scan will be activated
3408  *   to ensure that all luns are detected.
3409  *
3410  * Called from normal process context only - cannot be called from interrupt.
3411  *
3412  * Notes:
3413  *      This routine assumes no locks are held on entry.
3414  */
3415 void
3416 fc_remote_port_delete(struct fc_rport  *rport)
3417 {
3418         struct Scsi_Host *shost = rport_to_shost(rport);
3419         unsigned long timeout = rport->dev_loss_tmo;
3420         unsigned long flags;
3421
3422         /*
3423          * No need to flush the fc_host work_q's, as all adds are synchronous.
3424          *
3425          * We do need to reclaim the rport scan work element, so eventually
3426          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
3427          * there's still a scan pending.
3428          */
3429
3430         spin_lock_irqsave(shost->host_lock, flags);
3431
3432         if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
3433                 (rport->port_state != FC_PORTSTATE_MARGINAL)) {
3434                 spin_unlock_irqrestore(shost->host_lock, flags);
3435                 return;
3436         }
3437
3438         /*
3439          * In the past, we if this was not an FCP-Target, we would
3440          * unconditionally just jump to deleting the rport.
3441          * However, rports can be used as node containers by the LLDD,
3442          * and its not appropriate to just terminate the rport at the
3443          * first sign of a loss in connectivity. The LLDD may want to
3444          * send ELS traffic to re-validate the login. If the rport is
3445          * immediately deleted, it makes it inappropriate for a node
3446          * container.
3447          * So... we now unconditionally wait dev_loss_tmo before
3448          * destroying an rport.
3449          */
3450
3451         rport->port_state = FC_PORTSTATE_BLOCKED;
3452
3453         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
3454
3455         spin_unlock_irqrestore(shost->host_lock, flags);
3456
3457         scsi_target_block(&rport->dev);
3458
3459         /* see if we need to kill io faster than waiting for device loss */
3460         if ((rport->fast_io_fail_tmo != -1) &&
3461             (rport->fast_io_fail_tmo < timeout))
3462                 fc_queue_devloss_work(shost, &rport->fail_io_work,
3463                                         rport->fast_io_fail_tmo * HZ);
3464
3465         /* cap the length the devices can be blocked until they are deleted */
3466         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
3467 }
3468 EXPORT_SYMBOL(fc_remote_port_delete);
3469
3470 /**
3471  * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
3472  * @rport:      The remote port that changed.
3473  * @roles:      New roles for this port.
3474  *
3475  * Description: The LLDD calls this routine to notify the transport that the
3476  * roles on a remote port may have changed. The largest effect of this is
3477  * if a port now becomes a FCP Target, it must be allocated a
3478  * scsi target id.  If the port is no longer a FCP target, any
3479  * scsi target id value assigned to it will persist in case the
3480  * role changes back to include FCP Target. No changes in the scsi
3481  * midlayer will be invoked if the role changes (in the expectation
3482  * that the role will be resumed. If it doesn't normal error processing
3483  * will take place).
3484  *
3485  * Should not be called from interrupt context.
3486  *
3487  * Notes:
3488  *      This routine assumes no locks are held on entry.
3489  */
3490 void
3491 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
3492 {
3493         struct Scsi_Host *shost = rport_to_shost(rport);
3494         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3495         unsigned long flags;
3496         int create = 0;
3497
3498         spin_lock_irqsave(shost->host_lock, flags);
3499         if (roles & FC_PORT_ROLE_FCP_TARGET) {
3500                 if (rport->scsi_target_id == -1) {
3501                         rport->scsi_target_id = fc_host->next_target_id++;
3502                         create = 1;
3503                 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3504                         create = 1;
3505         }
3506
3507         rport->roles = roles;
3508
3509         spin_unlock_irqrestore(shost->host_lock, flags);
3510
3511         if (create) {
3512                 /*
3513                  * There may have been a delete timer running on the
3514                  * port. Ensure that it is cancelled as we now know
3515                  * the port is an FCP Target.
3516                  * Note: we know the rport exists and is in an online
3517                  *  state as the LLDD would not have had an rport
3518                  *  reference to pass us.
3519                  *
3520                  * Take no action on the del_timer failure as the state
3521                  * machine state change will validate the
3522                  * transaction.
3523                  */
3524                 if (!cancel_delayed_work(&rport->fail_io_work))
3525                         fc_flush_devloss(shost);
3526                 if (!cancel_delayed_work(&rport->dev_loss_work))
3527                         fc_flush_devloss(shost);
3528
3529                 spin_lock_irqsave(shost->host_lock, flags);
3530                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3531                                   FC_RPORT_DEVLOSS_PENDING |
3532                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
3533                 spin_unlock_irqrestore(shost->host_lock, flags);
3534
3535                 /* ensure any stgt delete functions are done */
3536                 fc_flush_work(shost);
3537
3538                 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
3539                 /* initiate a scan of the target */
3540                 spin_lock_irqsave(shost->host_lock, flags);
3541                 rport->flags |= FC_RPORT_SCAN_PENDING;
3542                 scsi_queue_work(shost, &rport->scan_work);
3543                 spin_unlock_irqrestore(shost->host_lock, flags);
3544         }
3545 }
3546 EXPORT_SYMBOL(fc_remote_port_rolechg);
3547
3548 /**
3549  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3550  * @work:       rport target that failed to reappear in the allotted time.
3551  *
3552  * Description: An attempt to delete a remote port blocks, and if it fails
3553  *              to return in the allotted time this gets called.
3554  */
3555 static void
3556 fc_timeout_deleted_rport(struct work_struct *work)
3557 {
3558         struct fc_rport *rport =
3559                 container_of(work, struct fc_rport, dev_loss_work.work);
3560         struct Scsi_Host *shost = rport_to_shost(rport);
3561         struct fc_internal *i = to_fc_internal(shost->transportt);
3562         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3563         unsigned long flags;
3564         int do_callback = 0;
3565
3566         spin_lock_irqsave(shost->host_lock, flags);
3567
3568         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3569
3570         /*
3571          * If the port is ONLINE, then it came back. If it was a SCSI
3572          * target, validate it still is. If not, tear down the
3573          * scsi_target on it.
3574          */
3575         if (((rport->port_state == FC_PORTSTATE_ONLINE) ||
3576                 (rport->port_state == FC_PORTSTATE_MARGINAL)) &&
3577             (rport->scsi_target_id != -1) &&
3578             !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3579                 dev_printk(KERN_ERR, &rport->dev,
3580                         "blocked FC remote port time out: no longer"
3581                         " a FCP target, removing starget\n");
3582                 spin_unlock_irqrestore(shost->host_lock, flags);
3583                 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
3584                 fc_queue_work(shost, &rport->stgt_delete_work);
3585                 return;
3586         }
3587
3588         /* NOOP state - we're flushing workq's */
3589         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3590                 spin_unlock_irqrestore(shost->host_lock, flags);
3591                 dev_printk(KERN_ERR, &rport->dev,
3592                         "blocked FC remote port time out: leaving"
3593                         " rport%s alone\n",
3594                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3595                 return;
3596         }
3597
3598         if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3599             (rport->scsi_target_id == -1)) {
3600                 list_del(&rport->peers);
3601                 rport->port_state = FC_PORTSTATE_DELETED;
3602                 dev_printk(KERN_ERR, &rport->dev,
3603                         "blocked FC remote port time out: removing"
3604                         " rport%s\n",
3605                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3606                 fc_queue_work(shost, &rport->rport_delete_work);
3607                 spin_unlock_irqrestore(shost->host_lock, flags);
3608                 return;
3609         }
3610
3611         dev_printk(KERN_ERR, &rport->dev,
3612                 "blocked FC remote port time out: removing target and "
3613                 "saving binding\n");
3614
3615         list_move_tail(&rport->peers, &fc_host->rport_bindings);
3616
3617         /*
3618          * Note: We do not remove or clear the hostdata area. This allows
3619          *   host-specific target data to persist along with the
3620          *   scsi_target_id. It's up to the host to manage it's hostdata area.
3621          */
3622
3623         /*
3624          * Reinitialize port attributes that may change if the port comes back.
3625          */
3626         rport->maxframe_size = -1;
3627         rport->supported_classes = FC_COS_UNSPECIFIED;
3628         rport->roles = FC_PORT_ROLE_UNKNOWN;
3629         rport->port_state = FC_PORTSTATE_NOTPRESENT;
3630         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3631
3632         /*
3633          * Pre-emptively kill I/O rather than waiting for the work queue
3634          * item to teardown the starget. (FCOE libFC folks prefer this
3635          * and to have the rport_port_id still set when it's done).
3636          */
3637         spin_unlock_irqrestore(shost->host_lock, flags);
3638         fc_terminate_rport_io(rport);
3639
3640         spin_lock_irqsave(shost->host_lock, flags);
3641
3642         if (rport->port_state == FC_PORTSTATE_NOTPRESENT) {     /* still missing */
3643
3644                 /* remove the identifiers that aren't used in the consisting binding */
3645                 switch (fc_host->tgtid_bind_type) {
3646                 case FC_TGTID_BIND_BY_WWPN:
3647                         rport->node_name = -1;
3648                         rport->port_id = -1;
3649                         break;
3650                 case FC_TGTID_BIND_BY_WWNN:
3651                         rport->port_name = -1;
3652                         rport->port_id = -1;
3653                         break;
3654                 case FC_TGTID_BIND_BY_ID:
3655                         rport->node_name = -1;
3656                         rport->port_name = -1;
3657                         break;
3658                 case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
3659                         break;
3660                 }
3661
3662                 /*
3663                  * As this only occurs if the remote port (scsi target)
3664                  * went away and didn't come back - we'll remove
3665                  * all attached scsi devices.
3666                  */
3667                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3668                 fc_queue_work(shost, &rport->stgt_delete_work);
3669
3670                 do_callback = 1;
3671         }
3672
3673         spin_unlock_irqrestore(shost->host_lock, flags);
3674
3675         /*
3676          * Notify the driver that the rport is now dead. The LLDD will
3677          * also guarantee that any communication to the rport is terminated
3678          *
3679          * Note: we set the CALLBK_DONE flag above to correspond
3680          */
3681         if (do_callback && i->f->dev_loss_tmo_callbk)
3682                 i->f->dev_loss_tmo_callbk(rport);
3683 }
3684
3685
3686 /**
3687  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3688  * @work:       rport to terminate io on.
3689  *
3690  * Notes: Only requests the failure of the io, not that all are flushed
3691  *    prior to returning.
3692  */
3693 static void
3694 fc_timeout_fail_rport_io(struct work_struct *work)
3695 {
3696         struct fc_rport *rport =
3697                 container_of(work, struct fc_rport, fail_io_work.work);
3698
3699         if (rport->port_state != FC_PORTSTATE_BLOCKED)
3700                 return;
3701
3702         rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3703         fc_terminate_rport_io(rport);
3704 }
3705
3706 /**
3707  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3708  * @work:       remote port to be scanned.
3709  */
3710 static void
3711 fc_scsi_scan_rport(struct work_struct *work)
3712 {
3713         struct fc_rport *rport =
3714                 container_of(work, struct fc_rport, scan_work);
3715         struct Scsi_Host *shost = rport_to_shost(rport);
3716         struct fc_internal *i = to_fc_internal(shost->transportt);
3717         unsigned long flags;
3718
3719         if (((rport->port_state == FC_PORTSTATE_ONLINE) ||
3720                 (rport->port_state == FC_PORTSTATE_MARGINAL)) &&
3721             (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3722             !(i->f->disable_target_scan)) {
3723                 scsi_scan_target(&rport->dev, rport->channel,
3724                                  rport->scsi_target_id, SCAN_WILD_CARD,
3725                                  SCSI_SCAN_RESCAN);
3726         }
3727
3728         spin_lock_irqsave(shost->host_lock, flags);
3729         rport->flags &= ~FC_RPORT_SCAN_PENDING;
3730         spin_unlock_irqrestore(shost->host_lock, flags);
3731 }
3732
3733 /**
3734  * fc_block_rport() - Block SCSI eh thread for blocked fc_rport.
3735  * @rport: Remote port that scsi_eh is trying to recover.
3736  *
3737  * This routine can be called from a FC LLD scsi_eh callback. It
3738  * blocks the scsi_eh thread until the fc_rport leaves the
3739  * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3740  * necessary to avoid the scsi_eh failing recovery actions for blocked
3741  * rports which would lead to offlined SCSI devices.
3742  *
3743  * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3744  *          FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3745  *          passed back to scsi_eh.
3746  */
3747 int fc_block_rport(struct fc_rport *rport)
3748 {
3749         struct Scsi_Host *shost = rport_to_shost(rport);
3750         unsigned long flags;
3751
3752         spin_lock_irqsave(shost->host_lock, flags);
3753         while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3754                !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3755                 spin_unlock_irqrestore(shost->host_lock, flags);
3756                 msleep(1000);
3757                 spin_lock_irqsave(shost->host_lock, flags);
3758         }
3759         spin_unlock_irqrestore(shost->host_lock, flags);
3760
3761         if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3762                 return FAST_IO_FAIL;
3763
3764         return 0;
3765 }
3766 EXPORT_SYMBOL(fc_block_rport);
3767
3768 /**
3769  * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3770  * @cmnd: SCSI command that scsi_eh is trying to recover
3771  *
3772  * This routine can be called from a FC LLD scsi_eh callback. It
3773  * blocks the scsi_eh thread until the fc_rport leaves the
3774  * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3775  * necessary to avoid the scsi_eh failing recovery actions for blocked
3776  * rports which would lead to offlined SCSI devices.
3777  *
3778  * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3779  *          FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3780  *          passed back to scsi_eh.
3781  */
3782 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3783 {
3784         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3785
3786         if (WARN_ON_ONCE(!rport))
3787                 return FAST_IO_FAIL;
3788
3789         return fc_block_rport(rport);
3790 }
3791 EXPORT_SYMBOL(fc_block_scsi_eh);
3792
3793 /*
3794  * fc_eh_should_retry_cmd - Checks if the cmd should be retried or not
3795  * @scmd:        The SCSI command to be checked
3796  *
3797  * This checks the rport state to decide if a cmd is
3798  * retryable.
3799  *
3800  * Returns: true if the rport state is not in marginal state.
3801  */
3802 bool fc_eh_should_retry_cmd(struct scsi_cmnd *scmd)
3803 {
3804         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
3805
3806         if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
3807                 (scsi_cmd_to_rq(scmd)->cmd_flags & REQ_FAILFAST_TRANSPORT)) {
3808                 set_host_byte(scmd, DID_TRANSPORT_MARGINAL);
3809                 return false;
3810         }
3811         return true;
3812 }
3813 EXPORT_SYMBOL_GPL(fc_eh_should_retry_cmd);
3814
3815 /**
3816  * fc_vport_setup - allocates and creates a FC virtual port.
3817  * @shost:      scsi host the virtual port is connected to.
3818  * @channel:    Channel on shost port connected to.
3819  * @pdev:       parent device for vport
3820  * @ids:        The world wide names, FC4 port roles, etc for
3821  *              the virtual port.
3822  * @ret_vport:  The pointer to the created vport.
3823  *
3824  * Allocates and creates the vport structure, calls the parent host
3825  * to instantiate the vport, this completes w/ class and sysfs creation.
3826  *
3827  * Notes:
3828  *      This routine assumes no locks are held on entry.
3829  */
3830 static int
3831 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3832         struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
3833 {
3834         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3835         struct fc_internal *fci = to_fc_internal(shost->transportt);
3836         struct fc_vport *vport;
3837         struct device *dev;
3838         unsigned long flags;
3839         size_t size;
3840         int error;
3841
3842         *ret_vport = NULL;
3843
3844         if ( ! fci->f->vport_create)
3845                 return -ENOENT;
3846
3847         size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3848         vport = kzalloc(size, GFP_KERNEL);
3849         if (unlikely(!vport)) {
3850                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3851                 return -ENOMEM;
3852         }
3853
3854         vport->vport_state = FC_VPORT_UNKNOWN;
3855         vport->vport_last_state = FC_VPORT_UNKNOWN;
3856         vport->node_name = ids->node_name;
3857         vport->port_name = ids->port_name;
3858         vport->roles = ids->roles;
3859         vport->vport_type = ids->vport_type;
3860         if (fci->f->dd_fcvport_size)
3861                 vport->dd_data = &vport[1];
3862         vport->shost = shost;
3863         vport->channel = channel;
3864         vport->flags = FC_VPORT_CREATING;
3865         INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3866
3867         spin_lock_irqsave(shost->host_lock, flags);
3868
3869         if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3870                 spin_unlock_irqrestore(shost->host_lock, flags);
3871                 kfree(vport);
3872                 return -ENOSPC;
3873         }
3874         fc_host->npiv_vports_inuse++;
3875         vport->number = fc_host->next_vport_number++;
3876         list_add_tail(&vport->peers, &fc_host->vports);
3877         scsi_host_get(shost);                   /* for fc_host->vport list */
3878
3879         spin_unlock_irqrestore(shost->host_lock, flags);
3880
3881         dev = &vport->dev;
3882         device_initialize(dev);                 /* takes self reference */
3883         dev->parent = get_device(pdev);         /* takes parent reference */
3884         dev->release = fc_vport_dev_release;
3885         dev_set_name(dev, "vport-%d:%d-%d",
3886                      shost->host_no, channel, vport->number);
3887         transport_setup_device(dev);
3888
3889         error = device_add(dev);
3890         if (error) {
3891                 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3892                 goto delete_vport;
3893         }
3894         transport_add_device(dev);
3895         transport_configure_device(dev);
3896
3897         error = fci->f->vport_create(vport, ids->disable);
3898         if (error) {
3899                 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3900                 goto delete_vport_all;
3901         }
3902
3903         /*
3904          * if the parent isn't the physical adapter's Scsi_Host, ensure
3905          * the Scsi_Host at least contains a symlink to the vport.
3906          */
3907         if (pdev != &shost->shost_gendev) {
3908                 error = sysfs_create_link(&shost->shost_gendev.kobj,
3909                                  &dev->kobj, dev_name(dev));
3910                 if (error)
3911                         printk(KERN_ERR
3912                                 "%s: Cannot create vport symlinks for "
3913                                 "%s, err=%d\n",
3914                                 __func__, dev_name(dev), error);
3915         }
3916         spin_lock_irqsave(shost->host_lock, flags);
3917         vport->flags &= ~FC_VPORT_CREATING;
3918         spin_unlock_irqrestore(shost->host_lock, flags);
3919
3920         dev_printk(KERN_NOTICE, pdev,
3921                         "%s created via shost%d channel %d\n", dev_name(dev),
3922                         shost->host_no, channel);
3923
3924         *ret_vport = vport;
3925
3926         return 0;
3927
3928 delete_vport_all:
3929         transport_remove_device(dev);
3930         device_del(dev);
3931 delete_vport:
3932         transport_destroy_device(dev);
3933         spin_lock_irqsave(shost->host_lock, flags);
3934         list_del(&vport->peers);
3935         scsi_host_put(shost);                   /* for fc_host->vport list */
3936         fc_host->npiv_vports_inuse--;
3937         spin_unlock_irqrestore(shost->host_lock, flags);
3938         put_device(dev->parent);
3939         kfree(vport);
3940
3941         return error;
3942 }
3943
3944 /**
3945  * fc_vport_create - Admin App or LLDD requests creation of a vport
3946  * @shost:      scsi host the virtual port is connected to.
3947  * @channel:    channel on shost port connected to.
3948  * @ids:        The world wide names, FC4 port roles, etc for
3949  *              the virtual port.
3950  *
3951  * Notes:
3952  *      This routine assumes no locks are held on entry.
3953  */
3954 struct fc_vport *
3955 fc_vport_create(struct Scsi_Host *shost, int channel,
3956         struct fc_vport_identifiers *ids)
3957 {
3958         int stat;
3959         struct fc_vport *vport;
3960
3961         stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3962                  ids, &vport);
3963         return stat ? NULL : vport;
3964 }
3965 EXPORT_SYMBOL(fc_vport_create);
3966
3967 /**
3968  * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3969  * @vport:      fc_vport to be terminated
3970  *
3971  * Calls the LLDD vport_delete() function, then deallocates and removes
3972  * the vport from the shost and object tree.
3973  *
3974  * Notes:
3975  *      This routine assumes no locks are held on entry.
3976  */
3977 int
3978 fc_vport_terminate(struct fc_vport *vport)
3979 {
3980         struct Scsi_Host *shost = vport_to_shost(vport);
3981         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3982         struct fc_internal *i = to_fc_internal(shost->transportt);
3983         struct device *dev = &vport->dev;
3984         unsigned long flags;
3985         int stat;
3986
3987         if (i->f->vport_delete)
3988                 stat = i->f->vport_delete(vport);
3989         else
3990                 stat = -ENOENT;
3991
3992         spin_lock_irqsave(shost->host_lock, flags);
3993         vport->flags &= ~FC_VPORT_DELETING;
3994         if (!stat) {
3995                 vport->flags |= FC_VPORT_DELETED;
3996                 list_del(&vport->peers);
3997                 fc_host->npiv_vports_inuse--;
3998                 scsi_host_put(shost);           /* for fc_host->vport list */
3999         }
4000         spin_unlock_irqrestore(shost->host_lock, flags);
4001
4002         if (stat)
4003                 return stat;
4004
4005         if (dev->parent != &shost->shost_gendev)
4006                 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
4007         transport_remove_device(dev);
4008         device_del(dev);
4009         transport_destroy_device(dev);
4010
4011         /*
4012          * Removing our self-reference should mean our
4013          * release function gets called, which will drop the remaining
4014          * parent reference and free the data structure.
4015          */
4016         put_device(dev);                        /* for self-reference */
4017
4018         return 0; /* SUCCESS */
4019 }
4020 EXPORT_SYMBOL(fc_vport_terminate);
4021
4022 /**
4023  * fc_vport_sched_delete - workq-based delete request for a vport
4024  * @work:       vport to be deleted.
4025  */
4026 static void
4027 fc_vport_sched_delete(struct work_struct *work)
4028 {
4029         struct fc_vport *vport =
4030                 container_of(work, struct fc_vport, vport_delete_work);
4031         int stat;
4032
4033         stat = fc_vport_terminate(vport);
4034         if (stat)
4035                 dev_printk(KERN_ERR, vport->dev.parent,
4036                         "%s: %s could not be deleted created via "
4037                         "shost%d channel %d - error %d\n", __func__,
4038                         dev_name(&vport->dev), vport->shost->host_no,
4039                         vport->channel, stat);
4040 }
4041
4042
4043 /*
4044  * BSG support
4045  */
4046
4047 /**
4048  * fc_bsg_job_timeout - handler for when a bsg request timesout
4049  * @req:        request that timed out
4050  */
4051 static enum blk_eh_timer_return
4052 fc_bsg_job_timeout(struct request *req)
4053 {
4054         struct bsg_job *job = blk_mq_rq_to_pdu(req);
4055         struct Scsi_Host *shost = fc_bsg_to_shost(job);
4056         struct fc_rport *rport = fc_bsg_to_rport(job);
4057         struct fc_internal *i = to_fc_internal(shost->transportt);
4058         int err = 0, inflight = 0;
4059
4060         if (rport && rport->port_state == FC_PORTSTATE_BLOCKED)
4061                 return BLK_EH_RESET_TIMER;
4062
4063         inflight = bsg_job_get(job);
4064
4065         if (inflight && i->f->bsg_timeout) {
4066                 /* call LLDD to abort the i/o as it has timed out */
4067                 err = i->f->bsg_timeout(job);
4068                 if (err == -EAGAIN) {
4069                         bsg_job_put(job);
4070                         return BLK_EH_RESET_TIMER;
4071                 } else if (err)
4072                         printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
4073                                 "abort failed with status %d\n", err);
4074         }
4075
4076         /* the blk_end_sync_io() doesn't check the error */
4077         if (inflight)
4078                 blk_mq_end_request(req, BLK_STS_IOERR);
4079         return BLK_EH_DONE;
4080 }
4081
4082 /**
4083  * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
4084  * @shost:      scsi host rport attached to
4085  * @job:        bsg job to be processed
4086  */
4087 static int fc_bsg_host_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
4088 {
4089         struct fc_internal *i = to_fc_internal(shost->transportt);
4090         struct fc_bsg_request *bsg_request = job->request;
4091         struct fc_bsg_reply *bsg_reply = job->reply;
4092         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
4093         int ret;
4094
4095         /* check if we really have all the request data needed */
4096         if (job->request_len < cmdlen) {
4097                 ret = -ENOMSG;
4098                 goto fail_host_msg;
4099         }
4100
4101         /* Validate the host command */
4102         switch (bsg_request->msgcode) {
4103         case FC_BSG_HST_ADD_RPORT:
4104                 cmdlen += sizeof(struct fc_bsg_host_add_rport);
4105                 break;
4106
4107         case FC_BSG_HST_DEL_RPORT:
4108                 cmdlen += sizeof(struct fc_bsg_host_del_rport);
4109                 break;
4110
4111         case FC_BSG_HST_ELS_NOLOGIN:
4112                 cmdlen += sizeof(struct fc_bsg_host_els);
4113                 /* there better be a xmt and rcv payloads */
4114                 if ((!job->request_payload.payload_len) ||
4115                     (!job->reply_payload.payload_len)) {
4116                         ret = -EINVAL;
4117                         goto fail_host_msg;
4118                 }
4119                 break;
4120
4121         case FC_BSG_HST_CT:
4122                 cmdlen += sizeof(struct fc_bsg_host_ct);
4123                 /* there better be xmt and rcv payloads */
4124                 if ((!job->request_payload.payload_len) ||
4125                     (!job->reply_payload.payload_len)) {
4126                         ret = -EINVAL;
4127                         goto fail_host_msg;
4128                 }
4129                 break;
4130
4131         case FC_BSG_HST_VENDOR:
4132                 cmdlen += sizeof(struct fc_bsg_host_vendor);
4133                 if ((shost->hostt->vendor_id == 0L) ||
4134                     (bsg_request->rqst_data.h_vendor.vendor_id !=
4135                         shost->hostt->vendor_id)) {
4136                         ret = -ESRCH;
4137                         goto fail_host_msg;
4138                 }
4139                 break;
4140
4141         default:
4142                 ret = -EBADR;
4143                 goto fail_host_msg;
4144         }
4145
4146         ret = i->f->bsg_request(job);
4147         if (!ret)
4148                 return 0;
4149
4150 fail_host_msg:
4151         /* return the errno failure code as the only status */
4152         BUG_ON(job->reply_len < sizeof(uint32_t));
4153         bsg_reply->reply_payload_rcv_len = 0;
4154         bsg_reply->result = ret;
4155         job->reply_len = sizeof(uint32_t);
4156         bsg_job_done(job, bsg_reply->result,
4157                        bsg_reply->reply_payload_rcv_len);
4158         return 0;
4159 }
4160
4161
4162 /*
4163  * fc_bsg_goose_queue - restart rport queue in case it was stopped
4164  * @rport:      rport to be restarted
4165  */
4166 static void
4167 fc_bsg_goose_queue(struct fc_rport *rport)
4168 {
4169         struct request_queue *q = rport->rqst_q;
4170
4171         if (q)
4172                 blk_mq_run_hw_queues(q, true);
4173 }
4174
4175 /**
4176  * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
4177  * @shost:      scsi host rport attached to
4178  * @job:        bsg job to be processed
4179  */
4180 static int fc_bsg_rport_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
4181 {
4182         struct fc_internal *i = to_fc_internal(shost->transportt);
4183         struct fc_bsg_request *bsg_request = job->request;
4184         struct fc_bsg_reply *bsg_reply = job->reply;
4185         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
4186         int ret;
4187
4188         /* check if we really have all the request data needed */
4189         if (job->request_len < cmdlen) {
4190                 ret = -ENOMSG;
4191                 goto fail_rport_msg;
4192         }
4193
4194         /* Validate the rport command */
4195         switch (bsg_request->msgcode) {
4196         case FC_BSG_RPT_ELS:
4197                 cmdlen += sizeof(struct fc_bsg_rport_els);
4198                 goto check_bidi;
4199
4200         case FC_BSG_RPT_CT:
4201                 cmdlen += sizeof(struct fc_bsg_rport_ct);
4202 check_bidi:
4203                 /* there better be xmt and rcv payloads */
4204                 if ((!job->request_payload.payload_len) ||
4205                     (!job->reply_payload.payload_len)) {
4206                         ret = -EINVAL;
4207                         goto fail_rport_msg;
4208                 }
4209                 break;
4210         default:
4211                 ret = -EBADR;
4212                 goto fail_rport_msg;
4213         }
4214
4215         ret = i->f->bsg_request(job);
4216         if (!ret)
4217                 return 0;
4218
4219 fail_rport_msg:
4220         /* return the errno failure code as the only status */
4221         BUG_ON(job->reply_len < sizeof(uint32_t));
4222         bsg_reply->reply_payload_rcv_len = 0;
4223         bsg_reply->result = ret;
4224         job->reply_len = sizeof(uint32_t);
4225         bsg_job_done(job, bsg_reply->result,
4226                        bsg_reply->reply_payload_rcv_len);
4227         return 0;
4228 }
4229
4230 static int fc_bsg_dispatch(struct bsg_job *job)
4231 {
4232         struct Scsi_Host *shost = fc_bsg_to_shost(job);
4233
4234         if (scsi_is_fc_rport(job->dev))
4235                 return fc_bsg_rport_dispatch(shost, job);
4236         else
4237                 return fc_bsg_host_dispatch(shost, job);
4238 }
4239
4240 static blk_status_t fc_bsg_rport_prep(struct fc_rport *rport)
4241 {
4242         if (rport->port_state == FC_PORTSTATE_BLOCKED &&
4243             !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
4244                 return BLK_STS_RESOURCE;
4245
4246         if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
4247                 (rport->port_state != FC_PORTSTATE_MARGINAL))
4248                 return BLK_STS_IOERR;
4249
4250         return BLK_STS_OK;
4251 }
4252
4253
4254 static int fc_bsg_dispatch_prep(struct bsg_job *job)
4255 {
4256         struct fc_rport *rport = fc_bsg_to_rport(job);
4257         blk_status_t ret;
4258
4259         ret = fc_bsg_rport_prep(rport);
4260         switch (ret) {
4261         case BLK_STS_OK:
4262                 break;
4263         case BLK_STS_RESOURCE:
4264                 return -EAGAIN;
4265         default:
4266                 return -EIO;
4267         }
4268
4269         return fc_bsg_dispatch(job);
4270 }
4271
4272 /**
4273  * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
4274  * @shost:      shost for fc_host
4275  * @fc_host:    fc_host adding the structures to
4276  */
4277 static int
4278 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
4279 {
4280         struct device *dev = &shost->shost_gendev;
4281         struct fc_internal *i = to_fc_internal(shost->transportt);
4282         struct request_queue *q;
4283         char bsg_name[20];
4284
4285         fc_host->rqst_q = NULL;
4286
4287         if (!i->f->bsg_request)
4288                 return -ENOTSUPP;
4289
4290         snprintf(bsg_name, sizeof(bsg_name),
4291                  "fc_host%d", shost->host_no);
4292
4293         q = bsg_setup_queue(dev, bsg_name, fc_bsg_dispatch, fc_bsg_job_timeout,
4294                                 i->f->dd_bsg_size);
4295         if (IS_ERR(q)) {
4296                 dev_err(dev,
4297                         "fc_host%d: bsg interface failed to initialize - setup queue\n",
4298                         shost->host_no);
4299                 return PTR_ERR(q);
4300         }
4301         __scsi_init_queue(shost, q);
4302         blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4303         fc_host->rqst_q = q;
4304         return 0;
4305 }
4306
4307 /**
4308  * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4309  * @shost:      shost that rport is attached to
4310  * @rport:      rport that the bsg hooks are being attached to
4311  */
4312 static int
4313 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4314 {
4315         struct device *dev = &rport->dev;
4316         struct fc_internal *i = to_fc_internal(shost->transportt);
4317         struct request_queue *q;
4318
4319         rport->rqst_q = NULL;
4320
4321         if (!i->f->bsg_request)
4322                 return -ENOTSUPP;
4323
4324         q = bsg_setup_queue(dev, dev_name(dev), fc_bsg_dispatch_prep,
4325                                 fc_bsg_job_timeout, i->f->dd_bsg_size);
4326         if (IS_ERR(q)) {
4327                 dev_err(dev, "failed to setup bsg queue\n");
4328                 return PTR_ERR(q);
4329         }
4330         __scsi_init_queue(shost, q);
4331         blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4332         rport->rqst_q = q;
4333         return 0;
4334 }
4335
4336
4337 /**
4338  * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4339  * @q:  the request_queue that is to be torn down.
4340  *
4341  * Notes:
4342  *   Before unregistering the queue empty any requests that are blocked
4343  *
4344  *
4345  */
4346 static void
4347 fc_bsg_remove(struct request_queue *q)
4348 {
4349         bsg_remove_queue(q);
4350 }
4351
4352
4353 /* Original Author:  Martin Hicks */
4354 MODULE_AUTHOR("James Smart");
4355 MODULE_DESCRIPTION("FC Transport Attributes");
4356 MODULE_LICENSE("GPL");
4357
4358 module_init(fc_transport_init);
4359 module_exit(fc_transport_exit);