drivers/s390/scsi/zfcp_fc.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Fibre Channel related functions for the zfcp device driver.
   5  *
   6  * Copyright IBM Corp. 2008, 2017
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/types.h>
  13 #include <linux/slab.h>
  14 #include <linux/utsname.h>
  15 #include <linux/random.h>
  16 #include <linux/bsg-lib.h>
  17 #include <scsi/fc/fc_els.h>
  18 #include <scsi/libfc.h>
  19 #include "zfcp_ext.h"
  20 #include "zfcp_fc.h"
  21
  22 struct kmem_cache *zfcp_fc_req_cache;
  23
  24 static u32 zfcp_fc_rscn_range_mask[] = {
  25         [ELS_ADDR_FMT_PORT]             = 0xFFFFFF,
  26         [ELS_ADDR_FMT_AREA]             = 0xFFFF00,
  27         [ELS_ADDR_FMT_DOM]              = 0xFF0000,
  28         [ELS_ADDR_FMT_FAB]              = 0x000000,
  29 };
  30
  31 static bool no_auto_port_rescan;
  32 module_param(no_auto_port_rescan, bool, 0600);
  33 MODULE_PARM_DESC(no_auto_port_rescan,
  34                  "no automatic port_rescan (default off)");
  35
  36 static unsigned int port_scan_backoff = 500;
  37 module_param(port_scan_backoff, uint, 0600);
  38 MODULE_PARM_DESC(port_scan_backoff,
  39         "upper limit of port scan random backoff in msecs (default 500)");
  40
  41 static unsigned int port_scan_ratelimit = 60000;
  42 module_param(port_scan_ratelimit, uint, 0600);
  43 MODULE_PARM_DESC(port_scan_ratelimit,
  44         "minimum interval between port scans in msecs (default 60000)");
  45
  46 unsigned int zfcp_fc_port_scan_backoff(void)
  47 {
  48         if (!port_scan_backoff)
  49                 return 0;
  50         return get_random_int() % port_scan_backoff;
  51 }
  52
  53 static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter)
  54 {
  55         unsigned long interval = msecs_to_jiffies(port_scan_ratelimit);
  56         unsigned long backoff = msecs_to_jiffies(zfcp_fc_port_scan_backoff());
  57
  58         adapter->next_port_scan = jiffies + interval + backoff;
  59 }
  60
  61 static void zfcp_fc_port_scan(struct zfcp_adapter *adapter)
  62 {
  63         unsigned long now = jiffies;
  64         unsigned long next = adapter->next_port_scan;
  65         unsigned long delay = 0, max;
  66
  67         /* delay only needed within waiting period */
  68         if (time_before(now, next)) {
  69                 delay = next - now;
  70                 /* paranoia: never ever delay scans longer than specified */
  71                 max = msecs_to_jiffies(port_scan_ratelimit + port_scan_backoff);
  72                 delay = min(delay, max);
  73         }
  74
  75         queue_delayed_work(adapter->work_queue, &adapter->scan_work, delay);
  76 }
  77
  78 void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter)
  79 {
  80         if (no_auto_port_rescan)
  81                 return;
  82
  83         zfcp_fc_port_scan(adapter);
  84 }
  85
  86 void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter)
  87 {
  88         if (!no_auto_port_rescan)
  89                 return;
  90
  91         zfcp_fc_port_scan(adapter);
  92 }
  93
  94 /**
  95  * zfcp_fc_post_event - post event to userspace via fc_transport
  96  * @work: work struct with enqueued events
  97  */
  98 void zfcp_fc_post_event(struct work_struct *work)
  99 {
 100         struct zfcp_fc_event *event = NULL, *tmp = NULL;
 101         LIST_HEAD(tmp_lh);
 102         struct zfcp_fc_events *events = container_of(work,
 103                                         struct zfcp_fc_events, work);
 104         struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter,
 105                                                 events);
 106
 107         spin_lock_bh(&events->list_lock);
 108         list_splice_init(&events->list, &tmp_lh);
 109         spin_unlock_bh(&events->list_lock);
 110
 111         list_for_each_entry_safe(event, tmp, &tmp_lh, list) {
 112                 fc_host_post_event(adapter->scsi_host, fc_get_event_number(),
 113                                 event->code, event->data);
 114                 list_del(&event->list);
 115                 kfree(event);
 116         }
 117
 118 }
 119
 120 /**
 121  * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context
 122  * @adapter: The adapter where to enqueue the event
 123  * @event_code: The event code (as defined in fc_host_event_code in
 124  *              scsi_transport_fc.h)
 125  * @event_data: The event data (e.g. n_port page in case of els)
 126  */
 127 void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter,
 128                         enum fc_host_event_code event_code, u32 event_data)
 129 {
 130         struct zfcp_fc_event *event;
 131
 132         event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC);
 133         if (!event)
 134                 return;
 135
 136         event->code = event_code;
 137         event->data = event_data;
 138
 139         spin_lock(&adapter->events.list_lock);
 140         list_add_tail(&event->list, &adapter->events.list);
 141         spin_unlock(&adapter->events.list_lock);
 142
 143         queue_work(adapter->work_queue, &adapter->events.work);
 144 }
 145
 146 static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port)
 147 {
 148         if (mutex_lock_interruptible(&wka_port->mutex))
 149                 return -ERESTARTSYS;
 150
 151         if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE ||
 152             wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) {
 153                 wka_port->status = ZFCP_FC_WKA_PORT_OPENING;
 154                 if (zfcp_fsf_open_wka_port(wka_port))
 155                         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 156         }
 157
 158         mutex_unlock(&wka_port->mutex);
 159
 160         wait_event(wka_port->completion_wq,
 161                    wka_port->status == ZFCP_FC_WKA_PORT_ONLINE ||
 162                    wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
 163
 164         if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) {
 165                 atomic_inc(&wka_port->refcount);
 166                 return 0;
 167         }
 168         return -EIO;
 169 }
 170
 171 static void zfcp_fc_wka_port_offline(struct work_struct *work)
 172 {
 173         struct delayed_work *dw = to_delayed_work(work);
 174         struct zfcp_fc_wka_port *wka_port =
 175                         container_of(dw, struct zfcp_fc_wka_port, work);
 176
 177         mutex_lock(&wka_port->mutex);
 178         if ((atomic_read(&wka_port->refcount) != 0) ||
 179             (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE))
 180                 goto out;
 181
 182         wka_port->status = ZFCP_FC_WKA_PORT_CLOSING;
 183         if (zfcp_fsf_close_wka_port(wka_port)) {
 184                 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 185                 wake_up(&wka_port->completion_wq);
 186         }
 187 out:
 188         mutex_unlock(&wka_port->mutex);
 189 }
 190
 191 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port)
 192 {
 193         if (atomic_dec_return(&wka_port->refcount) != 0)
 194                 return;
 195         /* wait 10 milliseconds, other reqs might pop in */
 196         schedule_delayed_work(&wka_port->work, HZ / 100);
 197 }
 198
 199 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id,
 200                                   struct zfcp_adapter *adapter)
 201 {
 202         init_waitqueue_head(&wka_port->completion_wq);
 203
 204         wka_port->adapter = adapter;
 205         wka_port->d_id = d_id;
 206
 207         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 208         atomic_set(&wka_port->refcount, 0);
 209         mutex_init(&wka_port->mutex);
 210         INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline);
 211 }
 212
 213 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka)
 214 {
 215         cancel_delayed_work_sync(&wka->work);
 216         mutex_lock(&wka->mutex);
 217         wka->status = ZFCP_FC_WKA_PORT_OFFLINE;
 218         mutex_unlock(&wka->mutex);
 219 }
 220
 221 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs)
 222 {
 223         if (!gs)
 224                 return;
 225         zfcp_fc_wka_port_force_offline(&gs->ms);
 226         zfcp_fc_wka_port_force_offline(&gs->ts);
 227         zfcp_fc_wka_port_force_offline(&gs->ds);
 228         zfcp_fc_wka_port_force_offline(&gs->as);
 229 }
 230
 231 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
 232                                    struct fc_els_rscn_page *page)
 233 {
 234         unsigned long flags;
 235         struct zfcp_adapter *adapter = fsf_req->adapter;
 236         struct zfcp_port *port;
 237
 238         read_lock_irqsave(&adapter->port_list_lock, flags);
 239         list_for_each_entry(port, &adapter->port_list, list) {
 240                 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range))
 241                         zfcp_fc_test_link(port);
 242                 if (!port->d_id)
 243                         zfcp_erp_port_reopen(port,
 244                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 245                                              "fcrscn1");
 246         }
 247         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 248 }
 249
 250 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 251 {
 252         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 253         struct fc_els_rscn *head;
 254         struct fc_els_rscn_page *page;
 255         u16 i;
 256         u16 no_entries;
 257         unsigned int afmt;
 258
 259         head = (struct fc_els_rscn *) status_buffer->payload.data;
 260         page = (struct fc_els_rscn_page *) head;
 261
 262         /* see FC-FS */
 263         no_entries = be16_to_cpu(head->rscn_plen) /
 264                 sizeof(struct fc_els_rscn_page);
 265
 266         for (i = 1; i < no_entries; i++) {
 267                 /* skip head and start with 1st element */
 268                 page++;
 269                 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
 270                 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
 271                                        page);
 272                 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,
 273                                       *(u32 *)page);
 274         }
 275         zfcp_fc_conditional_port_scan(fsf_req->adapter);
 276 }
 277
 278 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 279 {
 280         unsigned long flags;
 281         struct zfcp_adapter *adapter = req->adapter;
 282         struct zfcp_port *port;
 283
 284         read_lock_irqsave(&adapter->port_list_lock, flags);
 285         list_for_each_entry(port, &adapter->port_list, list)
 286                 if (port->wwpn == wwpn) {
 287                         zfcp_erp_port_forced_reopen(port, 0, "fciwwp1");
 288                         break;
 289                 }
 290         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 291 }
 292
 293 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 294 {
 295         struct fsf_status_read_buffer *status_buffer;
 296         struct fc_els_flogi *plogi;
 297
 298         status_buffer = (struct fsf_status_read_buffer *) req->data;
 299         plogi = (struct fc_els_flogi *) status_buffer->payload.data;
 300         zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn));
 301 }
 302
 303 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 304 {
 305         struct fsf_status_read_buffer *status_buffer =
 306                 (struct fsf_status_read_buffer *)req->data;
 307         struct fc_els_logo *logo =
 308                 (struct fc_els_logo *) status_buffer->payload.data;
 309
 310         zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn));
 311 }
 312
 313 /**
 314  * zfcp_fc_incoming_els - handle incoming ELS
 315  * @fsf_req - request which contains incoming ELS
 316  */
 317 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 318 {
 319         struct fsf_status_read_buffer *status_buffer =
 320                 (struct fsf_status_read_buffer *) fsf_req->data;
 321         unsigned int els_type = status_buffer->payload.data[0];
 322
 323         zfcp_dbf_san_in_els("fciels1", fsf_req);
 324         if (els_type == ELS_PLOGI)
 325                 zfcp_fc_incoming_plogi(fsf_req);
 326         else if (els_type == ELS_LOGO)
 327                 zfcp_fc_incoming_logo(fsf_req);
 328         else if (els_type == ELS_RSCN)
 329                 zfcp_fc_incoming_rscn(fsf_req);
 330 }
 331
 332 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req)
 333 {
 334         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 335         struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 336
 337         if (ct_els->status)
 338                 return;
 339         if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC))
 340                 return;
 341
 342         /* looks like a valid d_id */
 343         ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid);
 344 }
 345
 346 static void zfcp_fc_complete(void *data)
 347 {
 348         complete(data);
 349 }
 350
 351 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size)
 352 {
 353         ct_hdr->ct_rev = FC_CT_REV;
 354         ct_hdr->ct_fs_type = FC_FST_DIR;
 355         ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE;
 356         ct_hdr->ct_cmd = cpu_to_be16(cmd);
 357         ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4);
 358 }
 359
 360 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
 361                                      struct zfcp_fc_req *fc_req)
 362 {
 363         struct zfcp_adapter *adapter = port->adapter;
 364         DECLARE_COMPLETION_ONSTACK(completion);
 365         struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req;
 366         struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 367         int ret;
 368
 369         /* setup parameters for send generic command */
 370         fc_req->ct_els.port = port;
 371         fc_req->ct_els.handler = zfcp_fc_complete;
 372         fc_req->ct_els.handler_data = &completion;
 373         fc_req->ct_els.req = &fc_req->sg_req;
 374         fc_req->ct_els.resp = &fc_req->sg_rsp;
 375         sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req));
 376         sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp));
 377
 378         zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr,
 379                            FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE);
 380         gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn);
 381
 382         ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els,
 383                                adapter->pool.gid_pn_req,
 384                                ZFCP_FC_CTELS_TMO);
 385         if (!ret) {
 386                 wait_for_completion(&completion);
 387                 zfcp_fc_ns_gid_pn_eval(fc_req);
 388         }
 389         return ret;
 390 }
 391
 392 /**
 393  * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request
 394  * @port: port where GID_PN request is needed
 395  * return: -ENOMEM on error, 0 otherwise
 396  */
 397 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
 398 {
 399         int ret;
 400         struct zfcp_fc_req *fc_req;
 401         struct zfcp_adapter *adapter = port->adapter;
 402
 403         fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC);
 404         if (!fc_req)
 405                 return -ENOMEM;
 406
 407         memset(fc_req, 0, sizeof(*fc_req));
 408
 409         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 410         if (ret)
 411                 goto out;
 412
 413         ret = zfcp_fc_ns_gid_pn_request(port, fc_req);
 414
 415         zfcp_fc_wka_port_put(&adapter->gs->ds);
 416 out:
 417         mempool_free(fc_req, adapter->pool.gid_pn);
 418         return ret;
 419 }
 420
 421 void zfcp_fc_port_did_lookup(struct work_struct *work)
 422 {
 423         int ret;
 424         struct zfcp_port *port = container_of(work, struct zfcp_port,
 425                                               gid_pn_work);
 426
 427         ret = zfcp_fc_ns_gid_pn(port);
 428         if (ret) {
 429                 /* could not issue gid_pn for some reason */
 430                 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1");
 431                 goto out;
 432         }
 433
 434         if (!port->d_id) {
 435                 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
 436                 goto out;
 437         }
 438
 439         zfcp_erp_port_reopen(port, 0, "fcgpn_3");
 440 out:
 441         put_device(&port->dev);
 442 }
 443
 444 /**
 445  * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request
 446  * @port: The zfcp_port to lookup the d_id for.
 447  */
 448 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)
 449 {
 450         get_device(&port->dev);
 451         if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))
 452                 put_device(&port->dev);
 453 }
 454
 455 /**
 456  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 457  * @port: zfcp_port structure
 458  * @plogi: plogi payload
 459  *
 460  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 461  */
 462 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi)
 463 {
 464         if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) {
 465                 port->d_id = 0;
 466                 dev_warn(&port->adapter->ccw_device->dev,
 467                          "A port opened with WWPN 0x%016Lx returned data that "
 468                          "identifies it as WWPN 0x%016Lx\n",
 469                          (unsigned long long) port->wwpn,
 470                          (unsigned long long) be64_to_cpu(plogi->fl_wwpn));
 471                 return;
 472         }
 473
 474         port->wwnn = be64_to_cpu(plogi->fl_wwnn);
 475         port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data);
 476
 477         if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID))
 478                 port->supported_classes |= FC_COS_CLASS1;
 479         if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID))
 480                 port->supported_classes |= FC_COS_CLASS2;
 481         if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID))
 482                 port->supported_classes |= FC_COS_CLASS3;
 483         if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID))
 484                 port->supported_classes |= FC_COS_CLASS4;
 485 }
 486
 487 static void zfcp_fc_adisc_handler(void *data)
 488 {
 489         struct zfcp_fc_req *fc_req = data;
 490         struct zfcp_port *port = fc_req->ct_els.port;
 491         struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp;
 492
 493         if (fc_req->ct_els.status) {
 494                 /* request rejected or timed out */
 495                 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 496                                             "fcadh_1");
 497                 goto out;
 498         }
 499
 500         if (!port->wwnn)
 501                 port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn);
 502
 503         if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) ||
 504             !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 505                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 506                                      "fcadh_2");
 507                 goto out;
 508         }
 509
 510         /* port is good, unblock rport without going through erp */
 511         zfcp_scsi_schedule_rport_register(port);
 512  out:
 513         atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 514         put_device(&port->dev);
 515         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 516 }
 517
 518 static int zfcp_fc_adisc(struct zfcp_port *port)
 519 {
 520         struct zfcp_fc_req *fc_req;
 521         struct zfcp_adapter *adapter = port->adapter;
 522         struct Scsi_Host *shost = adapter->scsi_host;
 523         int ret;
 524
 525         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC);
 526         if (!fc_req)
 527                 return -ENOMEM;
 528
 529         fc_req->ct_els.port = port;
 530         fc_req->ct_els.req = &fc_req->sg_req;
 531         fc_req->ct_els.resp = &fc_req->sg_rsp;
 532         sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req,
 533                     sizeof(struct fc_els_adisc));
 534         sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp,
 535                     sizeof(struct fc_els_adisc));
 536
 537         fc_req->ct_els.handler = zfcp_fc_adisc_handler;
 538         fc_req->ct_els.handler_data = fc_req;
 539
 540         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 541            without FC-AL-2 capability, so we don't set it */
 542         fc_req->u.adisc.req.adisc_wwpn = cpu_to_be64(fc_host_port_name(shost));
 543         fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(fc_host_node_name(shost));
 544         fc_req->u.adisc.req.adisc_cmd = ELS_ADISC;
 545         hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost));
 546
 547         ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els,
 548                                 ZFCP_FC_CTELS_TMO);
 549         if (ret)
 550                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 551
 552         return ret;
 553 }
 554
 555 void zfcp_fc_link_test_work(struct work_struct *work)
 556 {
 557         struct zfcp_port *port =
 558                 container_of(work, struct zfcp_port, test_link_work);
 559         int retval;
 560
 561         get_device(&port->dev);
 562         port->rport_task = RPORT_DEL;
 563         zfcp_scsi_rport_work(&port->rport_work);
 564
 565         /* only issue one test command at one time per port */
 566         if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
 567                 goto out;
 568
 569         atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 570
 571         retval = zfcp_fc_adisc(port);
 572         if (retval == 0)
 573                 return;
 574
 575         /* send of ADISC was not possible */
 576         atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 577         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1");
 578
 579 out:
 580         put_device(&port->dev);
 581 }
 582
 583 /**
 584  * zfcp_fc_test_link - lightweight link test procedure
 585  * @port: port to be tested
 586  *
 587  * Test status of a link to a remote port using the ELS command ADISC.
 588  * If there is a problem with the remote port, error recovery steps
 589  * will be triggered.
 590  */
 591 void zfcp_fc_test_link(struct zfcp_port *port)
 592 {
 593         get_device(&port->dev);
 594         if (!queue_work(port->adapter->work_queue, &port->test_link_work))
 595                 put_device(&port->dev);
 596 }
 597
 598 static struct zfcp_fc_req *zfcp_alloc_sg_env(int buf_num)
 599 {
 600         struct zfcp_fc_req *fc_req;
 601
 602         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 603         if (!fc_req)
 604                 return NULL;
 605
 606         if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) {
 607                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 608                 return NULL;
 609         }
 610
 611         sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req,
 612                     sizeof(struct zfcp_fc_gpn_ft_req));
 613
 614         return fc_req;
 615 }
 616
 617 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req,
 618                                struct zfcp_adapter *adapter, int max_bytes)
 619 {
 620         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 621         struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req;
 622         DECLARE_COMPLETION_ONSTACK(completion);
 623         int ret;
 624
 625         zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes);
 626         req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;
 627
 628         ct_els->handler = zfcp_fc_complete;
 629         ct_els->handler_data = &completion;
 630         ct_els->req = &fc_req->sg_req;
 631         ct_els->resp = &fc_req->sg_rsp;
 632
 633         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 634                                ZFCP_FC_CTELS_TMO);
 635         if (!ret)
 636                 wait_for_completion(&completion);
 637         return ret;
 638 }
 639
 640 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
 641 {
 642         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 643                 return;
 644
 645         atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status);
 646
 647         if ((port->supported_classes != 0) ||
 648             !list_empty(&port->unit_list))
 649                 return;
 650
 651         list_move_tail(&port->list, lh);
 652 }
 653
 654 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,
 655                                struct zfcp_adapter *adapter, int max_entries)
 656 {
 657         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 658         struct scatterlist *sg = &fc_req->sg_rsp;
 659         struct fc_ct_hdr *hdr = sg_virt(sg);
 660         struct fc_gpn_ft_resp *acc = sg_virt(sg);
 661         struct zfcp_port *port, *tmp;
 662         unsigned long flags;
 663         LIST_HEAD(remove_lh);
 664         u32 d_id;
 665         int ret = 0, x, last = 0;
 666
 667         if (ct_els->status)
 668                 return -EIO;
 669
 670         if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) {
 671                 if (hdr->ct_reason == FC_FS_RJT_UNABL)
 672                         return -EAGAIN; /* might be a temporary condition */
 673                 return -EIO;
 674         }
 675
 676         if (hdr->ct_mr_size) {
 677                 dev_warn(&adapter->ccw_device->dev,
 678                          "The name server reported %d words residual data\n",
 679                          hdr->ct_mr_size);
 680                 return -E2BIG;
 681         }
 682
 683         /* first entry is the header */
 684         for (x = 1; x < max_entries && !last; x++) {
 685                 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
 686                         acc++;
 687                 else
 688                         acc = sg_virt(++sg);
 689
 690                 last = acc->fp_flags & FC_NS_FID_LAST;
 691                 d_id = ntoh24(acc->fp_fid);
 692
 693                 /* don't attach ports with a well known address */
 694                 if (d_id >= FC_FID_WELL_KNOWN_BASE)
 695                         continue;
 696                 /* skip the adapter's port and known remote ports */
 697                 if (be64_to_cpu(acc->fp_wwpn) ==
 698                     fc_host_port_name(adapter->scsi_host))
 699                         continue;
 700
 701                 port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn),
 702                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 703                 if (!IS_ERR(port))
 704                         zfcp_erp_port_reopen(port, 0, "fcegpf1");
 705                 else if (PTR_ERR(port) != -EEXIST)
 706                         ret = PTR_ERR(port);
 707         }
 708
 709         zfcp_erp_wait(adapter);
 710         write_lock_irqsave(&adapter->port_list_lock, flags);
 711         list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
 712                 zfcp_fc_validate_port(port, &remove_lh);
 713         write_unlock_irqrestore(&adapter->port_list_lock, flags);
 714
 715         list_for_each_entry_safe(port, tmp, &remove_lh, list) {
 716                 zfcp_erp_port_shutdown(port, 0, "fcegpf2");
 717                 device_unregister(&port->dev);
 718         }
 719
 720         return ret;
 721 }
 722
 723 /**
 724  * zfcp_fc_scan_ports - scan remote ports and attach new ports
 725  * @work: reference to scheduled work
 726  */
 727 void zfcp_fc_scan_ports(struct work_struct *work)
 728 {
 729         struct delayed_work *dw = to_delayed_work(work);
 730         struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter,
 731                                                     scan_work);
 732         int ret, i;
 733         struct zfcp_fc_req *fc_req;
 734         int chain, max_entries, buf_num, max_bytes;
 735
 736         zfcp_fc_port_scan_time(adapter);
 737
 738         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 739         buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1;
 740         max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE;
 741         max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE;
 742
 743         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 744             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 745                 return;
 746
 747         if (zfcp_fc_wka_port_get(&adapter->gs->ds))
 748                 return;
 749
 750         fc_req = zfcp_alloc_sg_env(buf_num);
 751         if (!fc_req)
 752                 goto out;
 753
 754         for (i = 0; i < 3; i++) {
 755                 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes);
 756                 if (!ret) {
 757                         ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries);
 758                         if (ret == -EAGAIN)
 759                                 ssleep(1);
 760                         else
 761                                 break;
 762                 }
 763         }
 764         zfcp_sg_free_table(&fc_req->sg_rsp, buf_num);
 765         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 766 out:
 767         zfcp_fc_wka_port_put(&adapter->gs->ds);
 768 }
 769
 770 static int zfcp_fc_gspn(struct zfcp_adapter *adapter,
 771                         struct zfcp_fc_req *fc_req)
 772 {
 773         DECLARE_COMPLETION_ONSTACK(completion);
 774         char devno[] = "DEVNO:";
 775         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 776         struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req;
 777         struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp;
 778         int ret;
 779
 780         zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID,
 781                            FC_SYMBOLIC_NAME_SIZE);
 782         hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host));
 783
 784         sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req));
 785         sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp));
 786
 787         ct_els->handler = zfcp_fc_complete;
 788         ct_els->handler_data = &completion;
 789         ct_els->req = &fc_req->sg_req;
 790         ct_els->resp = &fc_req->sg_rsp;
 791
 792         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 793                                ZFCP_FC_CTELS_TMO);
 794         if (ret)
 795                 return ret;
 796
 797         wait_for_completion(&completion);
 798         if (ct_els->status)
 799                 return ct_els->status;
 800
 801         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV &&
 802             !(strstr(gspn_rsp->gspn.fp_name, devno)))
 803                 snprintf(fc_host_symbolic_name(adapter->scsi_host),
 804                          FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s",
 805                          gspn_rsp->gspn.fp_name, devno,
 806                          dev_name(&adapter->ccw_device->dev),
 807                          init_utsname()->nodename);
 808         else
 809                 strlcpy(fc_host_symbolic_name(adapter->scsi_host),
 810                         gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE);
 811
 812         return 0;
 813 }
 814
 815 static void zfcp_fc_rspn(struct zfcp_adapter *adapter,
 816                          struct zfcp_fc_req *fc_req)
 817 {
 818         DECLARE_COMPLETION_ONSTACK(completion);
 819         struct Scsi_Host *shost = adapter->scsi_host;
 820         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 821         struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req;
 822         struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp;
 823         int ret, len;
 824
 825         zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID,
 826                            FC_SYMBOLIC_NAME_SIZE);
 827         hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost));
 828         len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost),
 829                       FC_SYMBOLIC_NAME_SIZE);
 830         rspn_req->rspn.fr_name_len = len;
 831
 832         sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req));
 833         sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp));
 834
 835         ct_els->handler = zfcp_fc_complete;
 836         ct_els->handler_data = &completion;
 837         ct_els->req = &fc_req->sg_req;
 838         ct_els->resp = &fc_req->sg_rsp;
 839
 840         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 841                                ZFCP_FC_CTELS_TMO);
 842         if (!ret)
 843                 wait_for_completion(&completion);
 844 }
 845
 846 /**
 847  * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name
 848  * @work: ns_up_work of the adapter where to update the symbolic port name
 849  *
 850  * Retrieve the current symbolic port name that may have been set by
 851  * the hardware using the GSPN request and update the fc_host
 852  * symbolic_name sysfs attribute. When running in NPIV mode (and hence
 853  * the port name is unique for this system), update the symbolic port
 854  * name to add Linux specific information and update the FC nameserver
 855  * using the RSPN request.
 856  */
 857 void zfcp_fc_sym_name_update(struct work_struct *work)
 858 {
 859         struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
 860                                                     ns_up_work);
 861         int ret;
 862         struct zfcp_fc_req *fc_req;
 863
 864         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 865             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 866                 return;
 867
 868         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 869         if (!fc_req)
 870                 return;
 871
 872         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 873         if (ret)
 874                 goto out_free;
 875
 876         ret = zfcp_fc_gspn(adapter, fc_req);
 877         if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 878                 goto out_ds_put;
 879
 880         memset(fc_req, 0, sizeof(*fc_req));
 881         zfcp_fc_rspn(adapter, fc_req);
 882
 883 out_ds_put:
 884         zfcp_fc_wka_port_put(&adapter->gs->ds);
 885 out_free:
 886         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 887 }
 888
 889 static void zfcp_fc_ct_els_job_handler(void *data)
 890 {
 891         struct bsg_job *job = data;
 892         struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data;
 893         struct fc_bsg_reply *jr = job->reply;
 894
 895         jr->reply_payload_rcv_len = job->reply_payload.payload_len;
 896         jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
 897         jr->result = zfcp_ct_els->status ? -EIO : 0;
 898         bsg_job_done(job, jr->result, jr->reply_payload_rcv_len);
 899 }
 900
 901 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job)
 902 {
 903         u32 preamble_word1;
 904         u8 gs_type;
 905         struct zfcp_adapter *adapter;
 906         struct fc_bsg_request *bsg_request = job->request;
 907         struct fc_rport *rport = fc_bsg_to_rport(job);
 908         struct Scsi_Host *shost;
 909
 910         preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1;
 911         gs_type = (preamble_word1 & 0xff000000) >> 24;
 912
 913         shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
 914         adapter = (struct zfcp_adapter *) shost->hostdata[0];
 915
 916         switch (gs_type) {
 917         case FC_FST_ALIAS:
 918                 return &adapter->gs->as;
 919         case FC_FST_MGMT:
 920                 return &adapter->gs->ms;
 921         case FC_FST_TIME:
 922                 return &adapter->gs->ts;
 923                 break;
 924         case FC_FST_DIR:
 925                 return &adapter->gs->ds;
 926                 break;
 927         default:
 928                 return NULL;
 929         }
 930 }
 931
 932 static void zfcp_fc_ct_job_handler(void *data)
 933 {
 934         struct bsg_job *job = data;
 935         struct zfcp_fc_wka_port *wka_port;
 936
 937         wka_port = zfcp_fc_job_wka_port(job);
 938         zfcp_fc_wka_port_put(wka_port);
 939
 940         zfcp_fc_ct_els_job_handler(data);
 941 }
 942
 943 static int zfcp_fc_exec_els_job(struct bsg_job *job,
 944                                 struct zfcp_adapter *adapter)
 945 {
 946         struct zfcp_fsf_ct_els *els = job->dd_data;
 947         struct fc_rport *rport = fc_bsg_to_rport(job);
 948         struct fc_bsg_request *bsg_request = job->request;
 949         struct zfcp_port *port;
 950         u32 d_id;
 951
 952         if (rport) {
 953                 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 954                 if (!port)
 955                         return -EINVAL;
 956
 957                 d_id = port->d_id;
 958                 put_device(&port->dev);
 959         } else
 960                 d_id = ntoh24(bsg_request->rqst_data.h_els.port_id);
 961
 962         els->handler = zfcp_fc_ct_els_job_handler;
 963         return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ);
 964 }
 965
 966 static int zfcp_fc_exec_ct_job(struct bsg_job *job,
 967                                struct zfcp_adapter *adapter)
 968 {
 969         int ret;
 970         struct zfcp_fsf_ct_els *ct = job->dd_data;
 971         struct zfcp_fc_wka_port *wka_port;
 972
 973         wka_port = zfcp_fc_job_wka_port(job);
 974         if (!wka_port)
 975                 return -EINVAL;
 976
 977         ret = zfcp_fc_wka_port_get(wka_port);
 978         if (ret)
 979                 return ret;
 980
 981         ct->handler = zfcp_fc_ct_job_handler;
 982         ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ);
 983         if (ret)
 984                 zfcp_fc_wka_port_put(wka_port);
 985
 986         return ret;
 987 }
 988
 989 int zfcp_fc_exec_bsg_job(struct bsg_job *job)
 990 {
 991         struct Scsi_Host *shost;
 992         struct zfcp_adapter *adapter;
 993         struct zfcp_fsf_ct_els *ct_els = job->dd_data;
 994         struct fc_bsg_request *bsg_request = job->request;
 995         struct fc_rport *rport = fc_bsg_to_rport(job);
 996
 997         shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
 998         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 999
1000         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
1001                 return -EINVAL;
1002
1003         ct_els->req = job->request_payload.sg_list;
1004         ct_els->resp = job->reply_payload.sg_list;
1005         ct_els->handler_data = job;
1006
1007         switch (bsg_request->msgcode) {
1008         case FC_BSG_RPT_ELS:
1009         case FC_BSG_HST_ELS_NOLOGIN:
1010                 return zfcp_fc_exec_els_job(job, adapter);
1011         case FC_BSG_RPT_CT:
1012         case FC_BSG_HST_CT:
1013                 return zfcp_fc_exec_ct_job(job, adapter);
1014         default:
1015                 return -EINVAL;
1016         }
1017 }
1018
1019 int zfcp_fc_timeout_bsg_job(struct bsg_job *job)
1020 {
1021         /* hardware tracks timeout, reset bsg timeout to not interfere */
1022         return -EAGAIN;
1023 }
1024
1025 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
1026 {
1027         struct zfcp_fc_wka_ports *wka_ports;
1028
1029         wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL);
1030         if (!wka_ports)
1031                 return -ENOMEM;
1032
1033         adapter->gs = wka_ports;
1034         zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);
1035         zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);
1036         zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);
1037         zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);
1038
1039         return 0;
1040 }
1041
1042 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)
1043 {
1044         kfree(adapter->gs);
1045         adapter->gs = NULL;
1046 }
1047