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