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         /* port is good, unblock rport without going through erp */
 522         zfcp_scsi_schedule_rport_register(port);
 523  out:
 524         atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 525         put_device(&port->dev);
 526         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 527 }
 528
 529 static int zfcp_fc_adisc(struct zfcp_port *port)
 530 {
 531         struct zfcp_fc_req *fc_req;
 532         struct zfcp_adapter *adapter = port->adapter;
 533         struct Scsi_Host *shost = adapter->scsi_host;
 534         int ret;
 535
 536         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC);
 537         if (!fc_req)
 538                 return -ENOMEM;
 539
 540         fc_req->ct_els.port = port;
 541         fc_req->ct_els.req = &fc_req->sg_req;
 542         fc_req->ct_els.resp = &fc_req->sg_rsp;
 543         sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req,
 544                     sizeof(struct fc_els_adisc));
 545         sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp,
 546                     sizeof(struct fc_els_adisc));
 547
 548         fc_req->ct_els.handler = zfcp_fc_adisc_handler;
 549         fc_req->ct_els.handler_data = fc_req;
 550
 551         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 552            without FC-AL-2 capability, so we don't set it */
 553         fc_req->u.adisc.req.adisc_wwpn = fc_host_port_name(shost);
 554         fc_req->u.adisc.req.adisc_wwnn = fc_host_node_name(shost);
 555         fc_req->u.adisc.req.adisc_cmd = ELS_ADISC;
 556         hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost));
 557
 558         ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els,
 559                                 ZFCP_FC_CTELS_TMO);
 560         if (ret)
 561                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 562
 563         return ret;
 564 }
 565
 566 void zfcp_fc_link_test_work(struct work_struct *work)
 567 {
 568         struct zfcp_port *port =
 569                 container_of(work, struct zfcp_port, test_link_work);
 570         int retval;
 571
 572         get_device(&port->dev);
 573         port->rport_task = RPORT_DEL;
 574         zfcp_scsi_rport_work(&port->rport_work);
 575
 576         /* only issue one test command at one time per port */
 577         if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
 578                 goto out;
 579
 580         atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 581
 582         retval = zfcp_fc_adisc(port);
 583         if (retval == 0)
 584                 return;
 585
 586         /* send of ADISC was not possible */
 587         atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 588         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1");
 589
 590 out:
 591         put_device(&port->dev);
 592 }
 593
 594 /**
 595  * zfcp_fc_test_link - lightweight link test procedure
 596  * @port: port to be tested
 597  *
 598  * Test status of a link to a remote port using the ELS command ADISC.
 599  * If there is a problem with the remote port, error recovery steps
 600  * will be triggered.
 601  */
 602 void zfcp_fc_test_link(struct zfcp_port *port)
 603 {
 604         get_device(&port->dev);
 605         if (!queue_work(port->adapter->work_queue, &port->test_link_work))
 606                 put_device(&port->dev);
 607 }
 608
 609 static struct zfcp_fc_req *zfcp_alloc_sg_env(int buf_num)
 610 {
 611         struct zfcp_fc_req *fc_req;
 612
 613         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 614         if (!fc_req)
 615                 return NULL;
 616
 617         if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) {
 618                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 619                 return NULL;
 620         }
 621
 622         sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req,
 623                     sizeof(struct zfcp_fc_gpn_ft_req));
 624
 625         return fc_req;
 626 }
 627
 628 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req,
 629                                struct zfcp_adapter *adapter, int max_bytes)
 630 {
 631         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 632         struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req;
 633         DECLARE_COMPLETION_ONSTACK(completion);
 634         int ret;
 635
 636         zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes);
 637         req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;
 638
 639         ct_els->handler = zfcp_fc_complete;
 640         ct_els->handler_data = &completion;
 641         ct_els->req = &fc_req->sg_req;
 642         ct_els->resp = &fc_req->sg_rsp;
 643
 644         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 645                                ZFCP_FC_CTELS_TMO);
 646         if (!ret)
 647                 wait_for_completion(&completion);
 648         return ret;
 649 }
 650
 651 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
 652 {
 653         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 654                 return;
 655
 656         atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status);
 657
 658         if ((port->supported_classes != 0) ||
 659             !list_empty(&port->unit_list))
 660                 return;
 661
 662         list_move_tail(&port->list, lh);
 663 }
 664
 665 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,
 666                                struct zfcp_adapter *adapter, int max_entries)
 667 {
 668         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 669         struct scatterlist *sg = &fc_req->sg_rsp;
 670         struct fc_ct_hdr *hdr = sg_virt(sg);
 671         struct fc_gpn_ft_resp *acc = sg_virt(sg);
 672         struct zfcp_port *port, *tmp;
 673         unsigned long flags;
 674         LIST_HEAD(remove_lh);
 675         u32 d_id;
 676         int ret = 0, x, last = 0;
 677
 678         if (ct_els->status)
 679                 return -EIO;
 680
 681         if (hdr->ct_cmd != FC_FS_ACC) {
 682                 if (hdr->ct_reason == FC_BA_RJT_UNABLE)
 683                         return -EAGAIN; /* might be a temporary condition */
 684                 return -EIO;
 685         }
 686
 687         if (hdr->ct_mr_size) {
 688                 dev_warn(&adapter->ccw_device->dev,
 689                          "The name server reported %d words residual data\n",
 690                          hdr->ct_mr_size);
 691                 return -E2BIG;
 692         }
 693
 694         /* first entry is the header */
 695         for (x = 1; x < max_entries && !last; x++) {
 696                 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
 697                         acc++;
 698                 else
 699                         acc = sg_virt(++sg);
 700
 701                 last = acc->fp_flags & FC_NS_FID_LAST;
 702                 d_id = ntoh24(acc->fp_fid);
 703
 704                 /* don't attach ports with a well known address */
 705                 if (d_id >= FC_FID_WELL_KNOWN_BASE)
 706                         continue;
 707                 /* skip the adapter's port and known remote ports */
 708                 if (acc->fp_wwpn == fc_host_port_name(adapter->scsi_host))
 709                         continue;
 710
 711                 port = zfcp_port_enqueue(adapter, acc->fp_wwpn,
 712                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 713                 if (!IS_ERR(port))
 714                         zfcp_erp_port_reopen(port, 0, "fcegpf1");
 715                 else if (PTR_ERR(port) != -EEXIST)
 716                         ret = PTR_ERR(port);
 717         }
 718
 719         zfcp_erp_wait(adapter);
 720         write_lock_irqsave(&adapter->port_list_lock, flags);
 721         list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
 722                 zfcp_fc_validate_port(port, &remove_lh);
 723         write_unlock_irqrestore(&adapter->port_list_lock, flags);
 724
 725         list_for_each_entry_safe(port, tmp, &remove_lh, list) {
 726                 zfcp_erp_port_shutdown(port, 0, "fcegpf2");
 727                 device_unregister(&port->dev);
 728         }
 729
 730         return ret;
 731 }
 732
 733 /**
 734  * zfcp_fc_scan_ports - scan remote ports and attach new ports
 735  * @work: reference to scheduled work
 736  */
 737 void zfcp_fc_scan_ports(struct work_struct *work)
 738 {
 739         struct delayed_work *dw = to_delayed_work(work);
 740         struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter,
 741                                                     scan_work);
 742         int ret, i;
 743         struct zfcp_fc_req *fc_req;
 744         int chain, max_entries, buf_num, max_bytes;
 745
 746         zfcp_fc_port_scan_time(adapter);
 747
 748         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 749         buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1;
 750         max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE;
 751         max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE;
 752
 753         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 754             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 755                 return;
 756
 757         if (zfcp_fc_wka_port_get(&adapter->gs->ds))
 758                 return;
 759
 760         fc_req = zfcp_alloc_sg_env(buf_num);
 761         if (!fc_req)
 762                 goto out;
 763
 764         for (i = 0; i < 3; i++) {
 765                 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes);
 766                 if (!ret) {
 767                         ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries);
 768                         if (ret == -EAGAIN)
 769                                 ssleep(1);
 770                         else
 771                                 break;
 772                 }
 773         }
 774         zfcp_sg_free_table(&fc_req->sg_rsp, buf_num);
 775         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 776 out:
 777         zfcp_fc_wka_port_put(&adapter->gs->ds);
 778 }
 779
 780 static int zfcp_fc_gspn(struct zfcp_adapter *adapter,
 781                         struct zfcp_fc_req *fc_req)
 782 {
 783         DECLARE_COMPLETION_ONSTACK(completion);
 784         char devno[] = "DEVNO:";
 785         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 786         struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req;
 787         struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp;
 788         int ret;
 789
 790         zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID,
 791                            FC_SYMBOLIC_NAME_SIZE);
 792         hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host));
 793
 794         sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req));
 795         sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp));
 796
 797         ct_els->handler = zfcp_fc_complete;
 798         ct_els->handler_data = &completion;
 799         ct_els->req = &fc_req->sg_req;
 800         ct_els->resp = &fc_req->sg_rsp;
 801
 802         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 803                                ZFCP_FC_CTELS_TMO);
 804         if (ret)
 805                 return ret;
 806
 807         wait_for_completion(&completion);
 808         if (ct_els->status)
 809                 return ct_els->status;
 810
 811         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV &&
 812             !(strstr(gspn_rsp->gspn.fp_name, devno)))
 813                 snprintf(fc_host_symbolic_name(adapter->scsi_host),
 814                          FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s",
 815                          gspn_rsp->gspn.fp_name, devno,
 816                          dev_name(&adapter->ccw_device->dev),
 817                          init_utsname()->nodename);
 818         else
 819                 strlcpy(fc_host_symbolic_name(adapter->scsi_host),
 820                         gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE);
 821
 822         return 0;
 823 }
 824
 825 static void zfcp_fc_rspn(struct zfcp_adapter *adapter,
 826                          struct zfcp_fc_req *fc_req)
 827 {
 828         DECLARE_COMPLETION_ONSTACK(completion);
 829         struct Scsi_Host *shost = adapter->scsi_host;
 830         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 831         struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req;
 832         struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp;
 833         int ret, len;
 834
 835         zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID,
 836                            FC_SYMBOLIC_NAME_SIZE);
 837         hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost));
 838         len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost),
 839                       FC_SYMBOLIC_NAME_SIZE);
 840         rspn_req->rspn.fr_name_len = len;
 841
 842         sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req));
 843         sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp));
 844
 845         ct_els->handler = zfcp_fc_complete;
 846         ct_els->handler_data = &completion;
 847         ct_els->req = &fc_req->sg_req;
 848         ct_els->resp = &fc_req->sg_rsp;
 849
 850         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 851                                ZFCP_FC_CTELS_TMO);
 852         if (!ret)
 853                 wait_for_completion(&completion);
 854 }
 855
 856 /**
 857  * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name
 858  * @work: ns_up_work of the adapter where to update the symbolic port name
 859  *
 860  * Retrieve the current symbolic port name that may have been set by
 861  * the hardware using the GSPN request and update the fc_host
 862  * symbolic_name sysfs attribute. When running in NPIV mode (and hence
 863  * the port name is unique for this system), update the symbolic port
 864  * name to add Linux specific information and update the FC nameserver
 865  * using the RSPN request.
 866  */
 867 void zfcp_fc_sym_name_update(struct work_struct *work)
 868 {
 869         struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
 870                                                     ns_up_work);
 871         int ret;
 872         struct zfcp_fc_req *fc_req;
 873
 874         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 875             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 876                 return;
 877
 878         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 879         if (!fc_req)
 880                 return;
 881
 882         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 883         if (ret)
 884                 goto out_free;
 885
 886         ret = zfcp_fc_gspn(adapter, fc_req);
 887         if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 888                 goto out_ds_put;
 889
 890         memset(fc_req, 0, sizeof(*fc_req));
 891         zfcp_fc_rspn(adapter, fc_req);
 892
 893 out_ds_put:
 894         zfcp_fc_wka_port_put(&adapter->gs->ds);
 895 out_free:
 896         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 897 }
 898
 899 static void zfcp_fc_ct_els_job_handler(void *data)
 900 {
 901         struct fc_bsg_job *job = data;
 902         struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data;
 903         struct fc_bsg_reply *jr = job->reply;
 904
 905         jr->reply_payload_rcv_len = job->reply_payload.payload_len;
 906         jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
 907         jr->result = zfcp_ct_els->status ? -EIO : 0;
 908         job->job_done(job);
 909 }
 910
 911 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct fc_bsg_job *job)
 912 {
 913         u32 preamble_word1;
 914         u8 gs_type;
 915         struct zfcp_adapter *adapter;
 916
 917         preamble_word1 = job->request->rqst_data.r_ct.preamble_word1;
 918         gs_type = (preamble_word1 & 0xff000000) >> 24;
 919
 920         adapter = (struct zfcp_adapter *) job->shost->hostdata[0];
 921
 922         switch (gs_type) {
 923         case FC_FST_ALIAS:
 924                 return &adapter->gs->as;
 925         case FC_FST_MGMT:
 926                 return &adapter->gs->ms;
 927         case FC_FST_TIME:
 928                 return &adapter->gs->ts;
 929                 break;
 930         case FC_FST_DIR:
 931                 return &adapter->gs->ds;
 932                 break;
 933         default:
 934                 return NULL;
 935         }
 936 }
 937
 938 static void zfcp_fc_ct_job_handler(void *data)
 939 {
 940         struct fc_bsg_job *job = data;
 941         struct zfcp_fc_wka_port *wka_port;
 942
 943         wka_port = zfcp_fc_job_wka_port(job);
 944         zfcp_fc_wka_port_put(wka_port);
 945
 946         zfcp_fc_ct_els_job_handler(data);
 947 }
 948
 949 static int zfcp_fc_exec_els_job(struct fc_bsg_job *job,
 950                                 struct zfcp_adapter *adapter)
 951 {
 952         struct zfcp_fsf_ct_els *els = job->dd_data;
 953         struct fc_rport *rport = job->rport;
 954         struct zfcp_port *port;
 955         u32 d_id;
 956
 957         if (rport) {
 958                 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 959                 if (!port)
 960                         return -EINVAL;
 961
 962                 d_id = port->d_id;
 963                 put_device(&port->dev);
 964         } else
 965                 d_id = ntoh24(job->request->rqst_data.h_els.port_id);
 966
 967         els->handler = zfcp_fc_ct_els_job_handler;
 968         return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ);
 969 }
 970
 971 static int zfcp_fc_exec_ct_job(struct fc_bsg_job *job,
 972                                struct zfcp_adapter *adapter)
 973 {
 974         int ret;
 975         struct zfcp_fsf_ct_els *ct = job->dd_data;
 976         struct zfcp_fc_wka_port *wka_port;
 977
 978         wka_port = zfcp_fc_job_wka_port(job);
 979         if (!wka_port)
 980                 return -EINVAL;
 981
 982         ret = zfcp_fc_wka_port_get(wka_port);
 983         if (ret)
 984                 return ret;
 985
 986         ct->handler = zfcp_fc_ct_job_handler;
 987         ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ);
 988         if (ret)
 989                 zfcp_fc_wka_port_put(wka_port);
 990
 991         return ret;
 992 }
 993
 994 int zfcp_fc_exec_bsg_job(struct fc_bsg_job *job)
 995 {
 996         struct Scsi_Host *shost;
 997         struct zfcp_adapter *adapter;
 998         struct zfcp_fsf_ct_els *ct_els = job->dd_data;
 999
1000         shost = job->rport ? rport_to_shost(job->rport) : job->shost;
1001         adapter = (struct zfcp_adapter *)shost->hostdata[0];
1002
1003         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
1004                 return -EINVAL;
1005
1006         ct_els->req = job->request_payload.sg_list;
1007         ct_els->resp = job->reply_payload.sg_list;
1008         ct_els->handler_data = job;
1009
1010         switch (job->request->msgcode) {
1011         case FC_BSG_RPT_ELS:
1012         case FC_BSG_HST_ELS_NOLOGIN:
1013                 return zfcp_fc_exec_els_job(job, adapter);
1014         case FC_BSG_RPT_CT:
1015         case FC_BSG_HST_CT:
1016                 return zfcp_fc_exec_ct_job(job, adapter);
1017         default:
1018                 return -EINVAL;
1019         }
1020 }
1021
1022 int zfcp_fc_timeout_bsg_job(struct fc_bsg_job *job)
1023 {
1024         /* hardware tracks timeout, reset bsg timeout to not interfere */
1025         return -EAGAIN;
1026 }
1027
1028 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
1029 {
1030         struct zfcp_fc_wka_ports *wka_ports;
1031
1032         wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL);
1033         if (!wka_ports)
1034                 return -ENOMEM;
1035
1036         adapter->gs = wka_ports;
1037         zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);
1038         zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);
1039         zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);
1040         zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);
1041
1042         return 0;
1043 }
1044
1045 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)
1046 {
1047         kfree(adapter->gs);
1048         adapter->gs = NULL;
1049 }
1050