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, 2010
   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 <scsi/fc/fc_els.h>
  17 #include <scsi/libfc.h>
  18 #include "zfcp_ext.h"
  19 #include "zfcp_fc.h"
  20
  21 struct kmem_cache *zfcp_fc_req_cache;
  22
  23 static u32 zfcp_fc_rscn_range_mask[] = {
  24         [ELS_ADDR_FMT_PORT]             = 0xFFFFFF,
  25         [ELS_ADDR_FMT_AREA]             = 0xFFFF00,
  26         [ELS_ADDR_FMT_DOM]              = 0xFF0000,
  27         [ELS_ADDR_FMT_FAB]              = 0x000000,
  28 };
  29
  30 static bool no_auto_port_rescan;
  31 module_param_named(no_auto_port_rescan, no_auto_port_rescan, bool, 0600);
  32 MODULE_PARM_DESC(no_auto_port_rescan,
  33                  "no automatic port_rescan (default off)");
  34
  35 static unsigned int port_scan_backoff = 500;
  36 module_param(port_scan_backoff, uint, 0600);
  37 MODULE_PARM_DESC(port_scan_backoff,
  38         "upper limit of port scan random backoff in msecs (default 500)");
  39
  40 static unsigned int port_scan_ratelimit = 60000;
  41 module_param(port_scan_ratelimit, uint, 0600);
  42 MODULE_PARM_DESC(port_scan_ratelimit,
  43         "minimum interval between port scans in msecs (default 60000)");
  44
  45 unsigned int zfcp_fc_port_scan_backoff(void)
  46 {
  47         if (!port_scan_backoff)
  48                 return 0;
  49         return get_random_int() % port_scan_backoff;
  50 }
  51
  52 static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter)
  53 {
  54         unsigned long interval = msecs_to_jiffies(port_scan_ratelimit);
  55         unsigned long backoff = msecs_to_jiffies(zfcp_fc_port_scan_backoff());
  56
  57         adapter->next_port_scan = jiffies + interval + backoff;
  58 }
  59
  60 static void zfcp_fc_port_scan(struct zfcp_adapter *adapter)
  61 {
  62         unsigned long now = jiffies;
  63         unsigned long next = adapter->next_port_scan;
  64         unsigned long delay = 0, max;
  65
  66         /* delay only needed within waiting period */
  67         if (time_before(now, next)) {
  68                 delay = next - now;
  69                 /* paranoia: never ever delay scans longer than specified */
  70                 max = msecs_to_jiffies(port_scan_ratelimit + port_scan_backoff);
  71                 delay = min(delay, max);
  72         }
  73
  74         queue_delayed_work(adapter->work_queue, &adapter->scan_work, delay);
  75 }
  76
  77 void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter)
  78 {
  79         if (no_auto_port_rescan)
  80                 return;
  81
  82         zfcp_fc_port_scan(adapter);
  83 }
  84
  85 void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter)
  86 {
  87         if (!no_auto_port_rescan)
  88                 return;
  89
  90         zfcp_fc_port_scan(adapter);
  91 }
  92
  93 /**
  94  * zfcp_fc_post_event - post event to userspace via fc_transport
  95  * @work: work struct with enqueued events
  96  */
  97 void zfcp_fc_post_event(struct work_struct *work)
  98 {
  99         struct zfcp_fc_event *event = NULL, *tmp = NULL;
 100         LIST_HEAD(tmp_lh);
 101         struct zfcp_fc_events *events = container_of(work,
 102                                         struct zfcp_fc_events, work);
 103         struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter,
 104                                                 events);
 105
 106         spin_lock_bh(&events->list_lock);
 107         list_splice_init(&events->list, &tmp_lh);
 108         spin_unlock_bh(&events->list_lock);
 109
 110         list_for_each_entry_safe(event, tmp, &tmp_lh, list) {
 111                 fc_host_post_event(adapter->scsi_host, fc_get_event_number(),
 112                                 event->code, event->data);
 113                 list_del(&event->list);
 114                 kfree(event);
 115         }
 116
 117 }
 118
 119 /**
 120  * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context
 121  * @adapter: The adapter where to enqueue the event
 122  * @event_code: The event code (as defined in fc_host_event_code in
 123  *              scsi_transport_fc.h)
 124  * @event_data: The event data (e.g. n_port page in case of els)
 125  */
 126 void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter,
 127                         enum fc_host_event_code event_code, u32 event_data)
 128 {
 129         struct zfcp_fc_event *event;
 130
 131         event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC);
 132         if (!event)
 133                 return;
 134
 135         event->code = event_code;
 136         event->data = event_data;
 137
 138         spin_lock(&adapter->events.list_lock);
 139         list_add_tail(&event->list, &adapter->events.list);
 140         spin_unlock(&adapter->events.list_lock);
 141
 142         queue_work(adapter->work_queue, &adapter->events.work);
 143 }
 144
 145 static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port)
 146 {
 147         if (mutex_lock_interruptible(&wka_port->mutex))
 148                 return -ERESTARTSYS;
 149
 150         if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE ||
 151             wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) {
 152                 wka_port->status = ZFCP_FC_WKA_PORT_OPENING;
 153                 if (zfcp_fsf_open_wka_port(wka_port))
 154                         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 155         }
 156
 157         mutex_unlock(&wka_port->mutex);
 158
 159         wait_event(wka_port->completion_wq,
 160                    wka_port->status == ZFCP_FC_WKA_PORT_ONLINE ||
 161                    wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
 162
 163         if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) {
 164                 atomic_inc(&wka_port->refcount);
 165                 return 0;
 166         }
 167         return -EIO;
 168 }
 169
 170 static void zfcp_fc_wka_port_offline(struct work_struct *work)
 171 {
 172         struct delayed_work *dw = to_delayed_work(work);
 173         struct zfcp_fc_wka_port *wka_port =
 174                         container_of(dw, struct zfcp_fc_wka_port, work);
 175
 176         mutex_lock(&wka_port->mutex);
 177         if ((atomic_read(&wka_port->refcount) != 0) ||
 178             (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE))
 179                 goto out;
 180
 181         wka_port->status = ZFCP_FC_WKA_PORT_CLOSING;
 182         if (zfcp_fsf_close_wka_port(wka_port)) {
 183                 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 184                 wake_up(&wka_port->completion_wq);
 185         }
 186 out:
 187         mutex_unlock(&wka_port->mutex);
 188 }
 189
 190 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port)
 191 {
 192         if (atomic_dec_return(&wka_port->refcount) != 0)
 193                 return;
 194         /* wait 10 milliseconds, other reqs might pop in */
 195         schedule_delayed_work(&wka_port->work, HZ / 100);
 196 }
 197
 198 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id,
 199                                   struct zfcp_adapter *adapter)
 200 {
 201         init_waitqueue_head(&wka_port->completion_wq);
 202
 203         wka_port->adapter = adapter;
 204         wka_port->d_id = d_id;
 205
 206         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 207         atomic_set(&wka_port->refcount, 0);
 208         mutex_init(&wka_port->mutex);
 209         INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline);
 210 }
 211
 212 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka)
 213 {
 214         cancel_delayed_work_sync(&wka->work);
 215         mutex_lock(&wka->mutex);
 216         wka->status = ZFCP_FC_WKA_PORT_OFFLINE;
 217         mutex_unlock(&wka->mutex);
 218 }
 219
 220 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs)
 221 {
 222         if (!gs)
 223                 return;
 224         zfcp_fc_wka_port_force_offline(&gs->ms);
 225         zfcp_fc_wka_port_force_offline(&gs->ts);
 226         zfcp_fc_wka_port_force_offline(&gs->ds);
 227         zfcp_fc_wka_port_force_offline(&gs->as);
 228 }
 229
 230 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
 231                                    struct fc_els_rscn_page *page)
 232 {
 233         unsigned long flags;
 234         struct zfcp_adapter *adapter = fsf_req->adapter;
 235         struct zfcp_port *port;
 236
 237         read_lock_irqsave(&adapter->port_list_lock, flags);
 238         list_for_each_entry(port, &adapter->port_list, list) {
 239                 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range))
 240                         zfcp_fc_test_link(port);
 241         }
 242         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 243 }
 244
 245 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 246 {
 247         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 248         struct zfcp_adapter *adapter = fsf_req->adapter;
 249         struct fc_els_rscn *head;
 250         struct fc_els_rscn_page *page;
 251         u16 i;
 252         u16 no_entries;
 253         unsigned int afmt;
 254
 255         head = (struct fc_els_rscn *) status_buffer->payload.data;
 256         page = (struct fc_els_rscn_page *) head;
 257
 258         /* see FC-FS */
 259         no_entries = head->rscn_plen / sizeof(struct fc_els_rscn_page);
 260
 261         if (no_entries > 1) {
 262                 /* handle failed ports */
 263                 unsigned long flags;
 264                 struct zfcp_port *port;
 265
 266                 read_lock_irqsave(&adapter->port_list_lock, flags);
 267                 list_for_each_entry(port, &adapter->port_list, list) {
 268                         if (port->d_id)
 269                                 continue;
 270                         zfcp_erp_port_reopen(port,
 271                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 272                                              "fcrscn1");
 273                 }
 274                 read_unlock_irqrestore(&adapter->port_list_lock, flags);
 275         }
 276
 277         for (i = 1; i < no_entries; i++) {
 278                 /* skip head and start with 1st element */
 279                 page++;
 280                 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
 281                 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
 282                                        page);
 283                 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,
 284                                       *(u32 *)page);
 285         }
 286         zfcp_fc_conditional_port_scan(fsf_req->adapter);
 287 }
 288
 289 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 290 {
 291         unsigned long flags;
 292         struct zfcp_adapter *adapter = req->adapter;
 293         struct zfcp_port *port;
 294
 295         read_lock_irqsave(&adapter->port_list_lock, flags);
 296         list_for_each_entry(port, &adapter->port_list, list)
 297                 if (port->wwpn == wwpn) {
 298                         zfcp_erp_port_forced_reopen(port, 0, "fciwwp1");
 299                         break;
 300                 }
 301         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 302 }
 303
 304 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 305 {
 306         struct fsf_status_read_buffer *status_buffer;
 307         struct fc_els_flogi *plogi;
 308
 309         status_buffer = (struct fsf_status_read_buffer *) req->data;
 310         plogi = (struct fc_els_flogi *) status_buffer->payload.data;
 311         zfcp_fc_incoming_wwpn(req, plogi->fl_wwpn);
 312 }
 313
 314 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 315 {
 316         struct fsf_status_read_buffer *status_buffer =
 317                 (struct fsf_status_read_buffer *)req->data;
 318         struct fc_els_logo *logo =
 319                 (struct fc_els_logo *) status_buffer->payload.data;
 320
 321         zfcp_fc_incoming_wwpn(req, logo->fl_n_port_wwn);
 322 }
 323
 324 /**
 325  * zfcp_fc_incoming_els - handle incoming ELS
 326  * @fsf_req - request which contains incoming ELS
 327  */
 328 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 329 {
 330         struct fsf_status_read_buffer *status_buffer =
 331                 (struct fsf_status_read_buffer *) fsf_req->data;
 332         unsigned int els_type = status_buffer->payload.data[0];
 333
 334         zfcp_dbf_san_in_els("fciels1", fsf_req);
 335         if (els_type == ELS_PLOGI)
 336                 zfcp_fc_incoming_plogi(fsf_req);
 337         else if (els_type == ELS_LOGO)
 338                 zfcp_fc_incoming_logo(fsf_req);
 339         else if (els_type == ELS_RSCN)
 340                 zfcp_fc_incoming_rscn(fsf_req);
 341 }
 342
 343 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req)
 344 {
 345         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 346         struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 347
 348         if (ct_els->status)
 349                 return;
 350         if (gid_pn_rsp->ct_hdr.ct_cmd != FC_FS_ACC)
 351                 return;
 352
 353         /* looks like a valid d_id */
 354         ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid);
 355 }
 356
 357 static void zfcp_fc_complete(void *data)
 358 {
 359         complete(data);
 360 }
 361
 362 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size)
 363 {
 364         ct_hdr->ct_rev = FC_CT_REV;
 365         ct_hdr->ct_fs_type = FC_FST_DIR;
 366         ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE;
 367         ct_hdr->ct_cmd = cmd;
 368         ct_hdr->ct_mr_size = mr_size / 4;
 369 }
 370
 371 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
 372                                      struct zfcp_fc_req *fc_req)
 373 {
 374         struct zfcp_adapter *adapter = port->adapter;
 375         DECLARE_COMPLETION_ONSTACK(completion);
 376         struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req;
 377         struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 378         int ret;
 379
 380         /* setup parameters for send generic command */
 381         fc_req->ct_els.port = port;
 382         fc_req->ct_els.handler = zfcp_fc_complete;
 383         fc_req->ct_els.handler_data = &completion;
 384         fc_req->ct_els.req = &fc_req->sg_req;
 385         fc_req->ct_els.resp = &fc_req->sg_rsp;
 386         sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req));
 387         sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp));
 388
 389         zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr,
 390                            FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE);
 391         gid_pn_req->gid_pn.fn_wwpn = port->wwpn;
 392
 393         ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els,
 394                                adapter->pool.gid_pn_req,
 395                                ZFCP_FC_CTELS_TMO);
 396         if (!ret) {
 397                 wait_for_completion(&completion);
 398                 zfcp_fc_ns_gid_pn_eval(fc_req);
 399         }
 400         return ret;
 401 }
 402
 403 /**
 404  * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request
 405  * @port: port where GID_PN request is needed
 406  * return: -ENOMEM on error, 0 otherwise
 407  */
 408 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
 409 {
 410         int ret;
 411         struct zfcp_fc_req *fc_req;
 412         struct zfcp_adapter *adapter = port->adapter;
 413
 414         fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC);
 415         if (!fc_req)
 416                 return -ENOMEM;
 417
 418         memset(fc_req, 0, sizeof(*fc_req));
 419
 420         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 421         if (ret)
 422                 goto out;
 423
 424         ret = zfcp_fc_ns_gid_pn_request(port, fc_req);
 425
 426         zfcp_fc_wka_port_put(&adapter->gs->ds);
 427 out:
 428         mempool_free(fc_req, adapter->pool.gid_pn);
 429         return ret;
 430 }
 431
 432 void zfcp_fc_port_did_lookup(struct work_struct *work)
 433 {
 434         int ret;
 435         struct zfcp_port *port = container_of(work, struct zfcp_port,
 436                                               gid_pn_work);
 437
 438         ret = zfcp_fc_ns_gid_pn(port);
 439         if (ret) {
 440                 /* could not issue gid_pn for some reason */
 441                 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1");
 442                 goto out;
 443         }
 444
 445         if (!port->d_id) {
 446                 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
 447                 goto out;
 448         }
 449
 450         zfcp_erp_port_reopen(port, 0, "fcgpn_3");
 451 out:
 452         put_device(&port->dev);
 453 }
 454
 455 /**
 456  * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request
 457  * @port: The zfcp_port to lookup the d_id for.
 458  */
 459 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)
 460 {
 461         get_device(&port->dev);
 462         if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))
 463                 put_device(&port->dev);
 464 }
 465
 466 /**
 467  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 468  * @port: zfcp_port structure
 469  * @plogi: plogi payload
 470  *
 471  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 472  */
 473 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi)
 474 {
 475         if (plogi->fl_wwpn != port->wwpn) {
 476                 port->d_id = 0;
 477                 dev_warn(&port->adapter->ccw_device->dev,
 478                          "A port opened with WWPN 0x%016Lx returned data that "
 479                          "identifies it as WWPN 0x%016Lx\n",
 480                          (unsigned long long) port->wwpn,
 481                          (unsigned long long) plogi->fl_wwpn);
 482                 return;
 483         }
 484
 485         port->wwnn = plogi->fl_wwnn;
 486         port->maxframe_size = plogi->fl_csp.sp_bb_data;
 487
 488         if (plogi->fl_cssp[0].cp_class & FC_CPC_VALID)
 489                 port->supported_classes |= FC_COS_CLASS1;
 490         if (plogi->fl_cssp[1].cp_class & FC_CPC_VALID)
 491                 port->supported_classes |= FC_COS_CLASS2;
 492         if (plogi->fl_cssp[2].cp_class & FC_CPC_VALID)
 493                 port->supported_classes |= FC_COS_CLASS3;
 494         if (plogi->fl_cssp[3].cp_class & FC_CPC_VALID)
 495                 port->supported_classes |= FC_COS_CLASS4;
 496 }
 497
 498 static void zfcp_fc_adisc_handler(void *data)
 499 {
 500         struct zfcp_fc_req *fc_req = data;
 501         struct zfcp_port *port = fc_req->ct_els.port;
 502         struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp;
 503
 504         if (fc_req->ct_els.status) {
 505                 /* request rejected or timed out */
 506                 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 507                                             "fcadh_1");
 508                 goto out;
 509         }
 510
 511         if (!port->wwnn)
 512                 port->wwnn = adisc_resp->adisc_wwnn;
 513
 514         if ((port->wwpn != adisc_resp->adisc_wwpn) ||
 515             !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 516                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 517                                      "fcadh_2");
 518                 goto out;
 519         }
 520
 521         /* re-init to undo drop from zfcp_fc_adisc() */
 522         port->d_id = ntoh24(adisc_resp->adisc_port_id);
 523         /* port is good, unblock rport without going through erp */
 524         zfcp_scsi_schedule_rport_register(port);
 525  out:
 526         atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 527         put_device(&port->dev);
 528         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 529 }
 530
 531 static int zfcp_fc_adisc(struct zfcp_port *port)
 532 {
 533         struct zfcp_fc_req *fc_req;
 534         struct zfcp_adapter *adapter = port->adapter;
 535         struct Scsi_Host *shost = adapter->scsi_host;
 536         u32 d_id;
 537         int ret;
 538
 539         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC);
 540         if (!fc_req)
 541                 return -ENOMEM;
 542
 543         fc_req->ct_els.port = port;
 544         fc_req->ct_els.req = &fc_req->sg_req;
 545         fc_req->ct_els.resp = &fc_req->sg_rsp;
 546         sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req,
 547                     sizeof(struct fc_els_adisc));
 548         sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp,
 549                     sizeof(struct fc_els_adisc));
 550
 551         fc_req->ct_els.handler = zfcp_fc_adisc_handler;
 552         fc_req->ct_els.handler_data = fc_req;
 553
 554         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 555            without FC-AL-2 capability, so we don't set it */
 556         fc_req->u.adisc.req.adisc_wwpn = fc_host_port_name(shost);
 557         fc_req->u.adisc.req.adisc_wwnn = fc_host_node_name(shost);
 558         fc_req->u.adisc.req.adisc_cmd = ELS_ADISC;
 559         hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost));
 560
 561         d_id = port->d_id; /* remember as destination for send els below */
 562         /*
 563          * Force fresh GID_PN lookup on next port recovery.
 564          * Must happen after request setup and before sending request,
 565          * to prevent race with port->d_id re-init in zfcp_fc_adisc_handler().
 566          */
 567         port->d_id = 0;
 568
 569         ret = zfcp_fsf_send_els(adapter, d_id, &fc_req->ct_els,
 570                                 ZFCP_FC_CTELS_TMO);
 571         if (ret)
 572                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 573
 574         return ret;
 575 }
 576
 577 void zfcp_fc_link_test_work(struct work_struct *work)
 578 {
 579         struct zfcp_port *port =
 580                 container_of(work, struct zfcp_port, test_link_work);
 581         int retval;
 582
 583         get_device(&port->dev);
 584         port->rport_task = RPORT_DEL;
 585         zfcp_scsi_rport_work(&port->rport_work);
 586
 587         /* only issue one test command at one time per port */
 588         if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
 589                 goto out;
 590
 591         atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 592
 593         retval = zfcp_fc_adisc(port);
 594         if (retval == 0)
 595                 return;
 596
 597         /* send of ADISC was not possible */
 598         atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 599         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1");
 600
 601 out:
 602         put_device(&port->dev);
 603 }
 604
 605 /**
 606  * zfcp_fc_test_link - lightweight link test procedure
 607  * @port: port to be tested
 608  *
 609  * Test status of a link to a remote port using the ELS command ADISC.
 610  * If there is a problem with the remote port, error recovery steps
 611  * will be triggered.
 612  */
 613 void zfcp_fc_test_link(struct zfcp_port *port)
 614 {
 615         get_device(&port->dev);
 616         if (!queue_work(port->adapter->work_queue, &port->test_link_work))
 617                 put_device(&port->dev);
 618 }
 619
 620 static struct zfcp_fc_req *zfcp_alloc_sg_env(int buf_num)
 621 {
 622         struct zfcp_fc_req *fc_req;
 623
 624         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 625         if (!fc_req)
 626                 return NULL;
 627
 628         if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) {
 629                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 630                 return NULL;
 631         }
 632
 633         sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req,
 634                     sizeof(struct zfcp_fc_gpn_ft_req));
 635
 636         return fc_req;
 637 }
 638
 639 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req,
 640                                struct zfcp_adapter *adapter, int max_bytes)
 641 {
 642         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 643         struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req;
 644         DECLARE_COMPLETION_ONSTACK(completion);
 645         int ret;
 646
 647         zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes);
 648         req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;
 649
 650         ct_els->handler = zfcp_fc_complete;
 651         ct_els->handler_data = &completion;
 652         ct_els->req = &fc_req->sg_req;
 653         ct_els->resp = &fc_req->sg_rsp;
 654
 655         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 656                                ZFCP_FC_CTELS_TMO);
 657         if (!ret)
 658                 wait_for_completion(&completion);
 659         return ret;
 660 }
 661
 662 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
 663 {
 664         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 665                 return;
 666
 667         atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status);
 668
 669         if ((port->supported_classes != 0) ||
 670             !list_empty(&port->unit_list))
 671                 return;
 672
 673         list_move_tail(&port->list, lh);
 674 }
 675
 676 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,
 677                                struct zfcp_adapter *adapter, int max_entries)
 678 {
 679         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 680         struct scatterlist *sg = &fc_req->sg_rsp;
 681         struct fc_ct_hdr *hdr = sg_virt(sg);
 682         struct fc_gpn_ft_resp *acc = sg_virt(sg);
 683         struct zfcp_port *port, *tmp;
 684         unsigned long flags;
 685         LIST_HEAD(remove_lh);
 686         u32 d_id;
 687         int ret = 0, x, last = 0;
 688
 689         if (ct_els->status)
 690                 return -EIO;
 691
 692         if (hdr->ct_cmd != FC_FS_ACC) {
 693                 if (hdr->ct_reason == FC_BA_RJT_UNABLE)
 694                         return -EAGAIN; /* might be a temporary condition */
 695                 return -EIO;
 696         }
 697
 698         if (hdr->ct_mr_size) {
 699                 dev_warn(&adapter->ccw_device->dev,
 700                          "The name server reported %d words residual data\n",
 701                          hdr->ct_mr_size);
 702                 return -E2BIG;
 703         }
 704
 705         /* first entry is the header */
 706         for (x = 1; x < max_entries && !last; x++) {
 707                 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
 708                         acc++;
 709                 else
 710                         acc = sg_virt(++sg);
 711
 712                 last = acc->fp_flags & FC_NS_FID_LAST;
 713                 d_id = ntoh24(acc->fp_fid);
 714
 715                 /* don't attach ports with a well known address */
 716                 if (d_id >= FC_FID_WELL_KNOWN_BASE)
 717                         continue;
 718                 /* skip the adapter's port and known remote ports */
 719                 if (acc->fp_wwpn == fc_host_port_name(adapter->scsi_host))
 720                         continue;
 721
 722                 port = zfcp_port_enqueue(adapter, acc->fp_wwpn,
 723                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 724                 if (!IS_ERR(port))
 725                         zfcp_erp_port_reopen(port, 0, "fcegpf1");
 726                 else if (PTR_ERR(port) != -EEXIST)
 727                         ret = PTR_ERR(port);
 728         }
 729
 730         zfcp_erp_wait(adapter);
 731         write_lock_irqsave(&adapter->port_list_lock, flags);
 732         list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
 733                 zfcp_fc_validate_port(port, &remove_lh);
 734         write_unlock_irqrestore(&adapter->port_list_lock, flags);
 735
 736         list_for_each_entry_safe(port, tmp, &remove_lh, list) {
 737                 zfcp_erp_port_shutdown(port, 0, "fcegpf2");
 738                 device_unregister(&port->dev);
 739         }
 740
 741         return ret;
 742 }
 743
 744 /**
 745  * zfcp_fc_scan_ports - scan remote ports and attach new ports
 746  * @work: reference to scheduled work
 747  */
 748 void zfcp_fc_scan_ports(struct work_struct *work)
 749 {
 750         struct delayed_work *dw = to_delayed_work(work);
 751         struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter,
 752                                                     scan_work);
 753         int ret, i;
 754         struct zfcp_fc_req *fc_req;
 755         int chain, max_entries, buf_num, max_bytes;
 756
 757         zfcp_fc_port_scan_time(adapter);
 758
 759         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 760         buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1;
 761         max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE;
 762         max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE;
 763
 764         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 765             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 766                 return;
 767
 768         if (zfcp_fc_wka_port_get(&adapter->gs->ds))
 769                 return;
 770
 771         fc_req = zfcp_alloc_sg_env(buf_num);
 772         if (!fc_req)
 773                 goto out;
 774
 775         for (i = 0; i < 3; i++) {
 776                 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes);
 777                 if (!ret) {
 778                         ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries);
 779                         if (ret == -EAGAIN)
 780                                 ssleep(1);
 781                         else
 782                                 break;
 783                 }
 784         }
 785         zfcp_sg_free_table(&fc_req->sg_rsp, buf_num);
 786         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 787 out:
 788         zfcp_fc_wka_port_put(&adapter->gs->ds);
 789 }
 790
 791 static int zfcp_fc_gspn(struct zfcp_adapter *adapter,
 792                         struct zfcp_fc_req *fc_req)
 793 {
 794         DECLARE_COMPLETION_ONSTACK(completion);
 795         char devno[] = "DEVNO:";
 796         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 797         struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req;
 798         struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp;
 799         int ret;
 800
 801         zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID,
 802                            FC_SYMBOLIC_NAME_SIZE);
 803         hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host));
 804
 805         sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req));
 806         sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp));
 807
 808         ct_els->handler = zfcp_fc_complete;
 809         ct_els->handler_data = &completion;
 810         ct_els->req = &fc_req->sg_req;
 811         ct_els->resp = &fc_req->sg_rsp;
 812
 813         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 814                                ZFCP_FC_CTELS_TMO);
 815         if (ret)
 816                 return ret;
 817
 818         wait_for_completion(&completion);
 819         if (ct_els->status)
 820                 return ct_els->status;
 821
 822         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV &&
 823             !(strstr(gspn_rsp->gspn.fp_name, devno)))
 824                 snprintf(fc_host_symbolic_name(adapter->scsi_host),
 825                          FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s",
 826                          gspn_rsp->gspn.fp_name, devno,
 827                          dev_name(&adapter->ccw_device->dev),
 828                          init_utsname()->nodename);
 829         else
 830                 strlcpy(fc_host_symbolic_name(adapter->scsi_host),
 831                         gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE);
 832
 833         return 0;
 834 }
 835
 836 static void zfcp_fc_rspn(struct zfcp_adapter *adapter,
 837                          struct zfcp_fc_req *fc_req)
 838 {
 839         DECLARE_COMPLETION_ONSTACK(completion);
 840         struct Scsi_Host *shost = adapter->scsi_host;
 841         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 842         struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req;
 843         struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp;
 844         int ret, len;
 845
 846         zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID,
 847                            FC_SYMBOLIC_NAME_SIZE);
 848         hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost));
 849         len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost),
 850                       FC_SYMBOLIC_NAME_SIZE);
 851         rspn_req->rspn.fr_name_len = len;
 852
 853         sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req));
 854         sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp));
 855
 856         ct_els->handler = zfcp_fc_complete;
 857         ct_els->handler_data = &completion;
 858         ct_els->req = &fc_req->sg_req;
 859         ct_els->resp = &fc_req->sg_rsp;
 860
 861         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 862                                ZFCP_FC_CTELS_TMO);
 863         if (!ret)
 864                 wait_for_completion(&completion);
 865 }
 866
 867 /**
 868  * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name
 869  * @work: ns_up_work of the adapter where to update the symbolic port name
 870  *
 871  * Retrieve the current symbolic port name that may have been set by
 872  * the hardware using the GSPN request and update the fc_host
 873  * symbolic_name sysfs attribute. When running in NPIV mode (and hence
 874  * the port name is unique for this system), update the symbolic port
 875  * name to add Linux specific information and update the FC nameserver
 876  * using the RSPN request.
 877  */
 878 void zfcp_fc_sym_name_update(struct work_struct *work)
 879 {
 880         struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
 881                                                     ns_up_work);
 882         int ret;
 883         struct zfcp_fc_req *fc_req;
 884
 885         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 886             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 887                 return;
 888
 889         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 890         if (!fc_req)
 891                 return;
 892
 893         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 894         if (ret)
 895                 goto out_free;
 896
 897         ret = zfcp_fc_gspn(adapter, fc_req);
 898         if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 899                 goto out_ds_put;
 900
 901         memset(fc_req, 0, sizeof(*fc_req));
 902         zfcp_fc_rspn(adapter, fc_req);
 903
 904 out_ds_put:
 905         zfcp_fc_wka_port_put(&adapter->gs->ds);
 906 out_free:
 907         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 908 }
 909
 910 static void zfcp_fc_ct_els_job_handler(void *data)
 911 {
 912         struct fc_bsg_job *job = data;
 913         struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data;
 914         struct fc_bsg_reply *jr = job->reply;
 915
 916         jr->reply_payload_rcv_len = job->reply_payload.payload_len;
 917         jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
 918         jr->result = zfcp_ct_els->status ? -EIO : 0;
 919         job->job_done(job);
 920 }
 921
 922 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct fc_bsg_job *job)
 923 {
 924         u32 preamble_word1;
 925         u8 gs_type;
 926         struct zfcp_adapter *adapter;
 927
 928         preamble_word1 = job->request->rqst_data.r_ct.preamble_word1;
 929         gs_type = (preamble_word1 & 0xff000000) >> 24;
 930
 931         adapter = (struct zfcp_adapter *) job->shost->hostdata[0];
 932
 933         switch (gs_type) {
 934         case FC_FST_ALIAS:
 935                 return &adapter->gs->as;
 936         case FC_FST_MGMT:
 937                 return &adapter->gs->ms;
 938         case FC_FST_TIME:
 939                 return &adapter->gs->ts;
 940                 break;
 941         case FC_FST_DIR:
 942                 return &adapter->gs->ds;
 943                 break;
 944         default:
 945                 return NULL;
 946         }
 947 }
 948
 949 static void zfcp_fc_ct_job_handler(void *data)
 950 {
 951         struct fc_bsg_job *job = data;
 952         struct zfcp_fc_wka_port *wka_port;
 953
 954         wka_port = zfcp_fc_job_wka_port(job);
 955         zfcp_fc_wka_port_put(wka_port);
 956
 957         zfcp_fc_ct_els_job_handler(data);
 958 }
 959
 960 static int zfcp_fc_exec_els_job(struct fc_bsg_job *job,
 961                                 struct zfcp_adapter *adapter)
 962 {
 963         struct zfcp_fsf_ct_els *els = job->dd_data;
 964         struct fc_rport *rport = job->rport;
 965         struct zfcp_port *port;
 966         u32 d_id;
 967
 968         if (rport) {
 969                 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 970                 if (!port)
 971                         return -EINVAL;
 972
 973                 d_id = port->d_id;
 974                 put_device(&port->dev);
 975         } else
 976                 d_id = ntoh24(job->request->rqst_data.h_els.port_id);
 977
 978         els->handler = zfcp_fc_ct_els_job_handler;
 979         return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ);
 980 }
 981
 982 static int zfcp_fc_exec_ct_job(struct fc_bsg_job *job,
 983                                struct zfcp_adapter *adapter)
 984 {
 985         int ret;
 986         struct zfcp_fsf_ct_els *ct = job->dd_data;
 987         struct zfcp_fc_wka_port *wka_port;
 988
 989         wka_port = zfcp_fc_job_wka_port(job);
 990         if (!wka_port)
 991                 return -EINVAL;
 992
 993         ret = zfcp_fc_wka_port_get(wka_port);
 994         if (ret)
 995                 return ret;
 996
 997         ct->handler = zfcp_fc_ct_job_handler;
 998         ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ);
 999         if (ret)
1000                 zfcp_fc_wka_port_put(wka_port);
1001
1002         return ret;
1003 }
1004
1005 int zfcp_fc_exec_bsg_job(struct fc_bsg_job *job)
1006 {
1007         struct Scsi_Host *shost;
1008         struct zfcp_adapter *adapter;
1009         struct zfcp_fsf_ct_els *ct_els = job->dd_data;
1010
1011         shost = job->rport ? rport_to_shost(job->rport) : job->shost;
1012         adapter = (struct zfcp_adapter *)shost->hostdata[0];
1013
1014         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
1015                 return -EINVAL;
1016
1017         ct_els->req = job->request_payload.sg_list;
1018         ct_els->resp = job->reply_payload.sg_list;
1019         ct_els->handler_data = job;
1020
1021         switch (job->request->msgcode) {
1022         case FC_BSG_RPT_ELS:
1023         case FC_BSG_HST_ELS_NOLOGIN:
1024                 return zfcp_fc_exec_els_job(job, adapter);
1025         case FC_BSG_RPT_CT:
1026         case FC_BSG_HST_CT:
1027                 return zfcp_fc_exec_ct_job(job, adapter);
1028         default:
1029                 return -EINVAL;
1030         }
1031 }
1032
1033 int zfcp_fc_timeout_bsg_job(struct fc_bsg_job *job)
1034 {
1035         /* hardware tracks timeout, reset bsg timeout to not interfere */
1036         return -EAGAIN;
1037 }
1038
1039 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
1040 {
1041         struct zfcp_fc_wka_ports *wka_ports;
1042
1043         wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL);
1044         if (!wka_ports)
1045                 return -ENOMEM;
1046
1047         adapter->gs = wka_ports;
1048         zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);
1049         zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);
1050         zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);
1051         zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);
1052
1053         return 0;
1054 }
1055
1056 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)
1057 {
1058         kfree(adapter->gs);
1059         adapter->gs = NULL;
1060 }
1061