drivers/s390/scsi/zfcp_fc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * zfcp device driver
   4  *
   5  * Fibre Channel related functions for the zfcp device driver.
   6  *
   7  * Copyright IBM Corp. 2008, 2017
   8  */
   9
  10 #define KMSG_COMPONENT "zfcp"
  11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13 #include <linux/types.h>
  14 #include <linux/slab.h>
  15 #include <linux/utsname.h>
  16 #include <linux/random.h>
  17 #include <linux/bsg-lib.h>
  18 #include <scsi/fc/fc_els.h>
  19 #include <scsi/libfc.h>
  20 #include "zfcp_ext.h"
  21 #include "zfcp_fc.h"
  22
  23 struct kmem_cache *zfcp_fc_req_cache;
  24
  25 static u32 zfcp_fc_rscn_range_mask[] = {
  26         [ELS_ADDR_FMT_PORT]             = 0xFFFFFF,
  27         [ELS_ADDR_FMT_AREA]             = 0xFFFF00,
  28         [ELS_ADDR_FMT_DOM]              = 0xFF0000,
  29         [ELS_ADDR_FMT_FAB]              = 0x000000,
  30 };
  31
  32 static bool no_auto_port_rescan;
  33 module_param(no_auto_port_rescan, bool, 0600);
  34 MODULE_PARM_DESC(no_auto_port_rescan,
  35                  "no automatic port_rescan (default off)");
  36
  37 static unsigned int port_scan_backoff = 500;
  38 module_param(port_scan_backoff, uint, 0600);
  39 MODULE_PARM_DESC(port_scan_backoff,
  40         "upper limit of port scan random backoff in msecs (default 500)");
  41
  42 static unsigned int port_scan_ratelimit = 60000;
  43 module_param(port_scan_ratelimit, uint, 0600);
  44 MODULE_PARM_DESC(port_scan_ratelimit,
  45         "minimum interval between port scans in msecs (default 60000)");
  46
  47 unsigned int zfcp_fc_port_scan_backoff(void)
  48 {
  49         if (!port_scan_backoff)
  50                 return 0;
  51         return get_random_int() % port_scan_backoff;
  52 }
  53
  54 static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter)
  55 {
  56         unsigned long interval = msecs_to_jiffies(port_scan_ratelimit);
  57         unsigned long backoff = msecs_to_jiffies(zfcp_fc_port_scan_backoff());
  58
  59         adapter->next_port_scan = jiffies + interval + backoff;
  60 }
  61
  62 static void zfcp_fc_port_scan(struct zfcp_adapter *adapter)
  63 {
  64         unsigned long now = jiffies;
  65         unsigned long next = adapter->next_port_scan;
  66         unsigned long delay = 0, max;
  67
  68         /* delay only needed within waiting period */
  69         if (time_before(now, next)) {
  70                 delay = next - now;
  71                 /* paranoia: never ever delay scans longer than specified */
  72                 max = msecs_to_jiffies(port_scan_ratelimit + port_scan_backoff);
  73                 delay = min(delay, max);
  74         }
  75
  76         queue_delayed_work(adapter->work_queue, &adapter->scan_work, delay);
  77 }
  78
  79 void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter)
  80 {
  81         if (no_auto_port_rescan)
  82                 return;
  83
  84         zfcp_fc_port_scan(adapter);
  85 }
  86
  87 void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter)
  88 {
  89         if (!no_auto_port_rescan)
  90                 return;
  91
  92         zfcp_fc_port_scan(adapter);
  93 }
  94
  95 /**
  96  * zfcp_fc_post_event - post event to userspace via fc_transport
  97  * @work: work struct with enqueued events
  98  */
  99 void zfcp_fc_post_event(struct work_struct *work)
 100 {
 101         struct zfcp_fc_event *event = NULL, *tmp = NULL;
 102         LIST_HEAD(tmp_lh);
 103         struct zfcp_fc_events *events = container_of(work,
 104                                         struct zfcp_fc_events, work);
 105         struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter,
 106                                                 events);
 107
 108         spin_lock_bh(&events->list_lock);
 109         list_splice_init(&events->list, &tmp_lh);
 110         spin_unlock_bh(&events->list_lock);
 111
 112         list_for_each_entry_safe(event, tmp, &tmp_lh, list) {
 113                 fc_host_post_event(adapter->scsi_host, fc_get_event_number(),
 114                                 event->code, event->data);
 115                 list_del(&event->list);
 116                 kfree(event);
 117         }
 118
 119 }
 120
 121 /**
 122  * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context
 123  * @adapter: The adapter where to enqueue the event
 124  * @event_code: The event code (as defined in fc_host_event_code in
 125  *              scsi_transport_fc.h)
 126  * @event_data: The event data (e.g. n_port page in case of els)
 127  */
 128 void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter,
 129                         enum fc_host_event_code event_code, u32 event_data)
 130 {
 131         struct zfcp_fc_event *event;
 132
 133         event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC);
 134         if (!event)
 135                 return;
 136
 137         event->code = event_code;
 138         event->data = event_data;
 139
 140         spin_lock(&adapter->events.list_lock);
 141         list_add_tail(&event->list, &adapter->events.list);
 142         spin_unlock(&adapter->events.list_lock);
 143
 144         queue_work(adapter->work_queue, &adapter->events.work);
 145 }
 146
 147 static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port)
 148 {
 149         if (mutex_lock_interruptible(&wka_port->mutex))
 150                 return -ERESTARTSYS;
 151
 152         if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE ||
 153             wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) {
 154                 wka_port->status = ZFCP_FC_WKA_PORT_OPENING;
 155                 if (zfcp_fsf_open_wka_port(wka_port))
 156                         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 157         }
 158
 159         mutex_unlock(&wka_port->mutex);
 160
 161         wait_event(wka_port->completion_wq,
 162                    wka_port->status == ZFCP_FC_WKA_PORT_ONLINE ||
 163                    wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
 164
 165         if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) {
 166                 atomic_inc(&wka_port->refcount);
 167                 return 0;
 168         }
 169         return -EIO;
 170 }
 171
 172 static void zfcp_fc_wka_port_offline(struct work_struct *work)
 173 {
 174         struct delayed_work *dw = to_delayed_work(work);
 175         struct zfcp_fc_wka_port *wka_port =
 176                         container_of(dw, struct zfcp_fc_wka_port, work);
 177
 178         mutex_lock(&wka_port->mutex);
 179         if ((atomic_read(&wka_port->refcount) != 0) ||
 180             (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE))
 181                 goto out;
 182
 183         wka_port->status = ZFCP_FC_WKA_PORT_CLOSING;
 184         if (zfcp_fsf_close_wka_port(wka_port)) {
 185                 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 186                 wake_up(&wka_port->completion_wq);
 187         }
 188 out:
 189         mutex_unlock(&wka_port->mutex);
 190 }
 191
 192 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port)
 193 {
 194         if (atomic_dec_return(&wka_port->refcount) != 0)
 195                 return;
 196         /* wait 10 milliseconds, other reqs might pop in */
 197         schedule_delayed_work(&wka_port->work, HZ / 100);
 198 }
 199
 200 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id,
 201                                   struct zfcp_adapter *adapter)
 202 {
 203         init_waitqueue_head(&wka_port->completion_wq);
 204
 205         wka_port->adapter = adapter;
 206         wka_port->d_id = d_id;
 207
 208         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 209         atomic_set(&wka_port->refcount, 0);
 210         mutex_init(&wka_port->mutex);
 211         INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline);
 212 }
 213
 214 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka)
 215 {
 216         cancel_delayed_work_sync(&wka->work);
 217         mutex_lock(&wka->mutex);
 218         wka->status = ZFCP_FC_WKA_PORT_OFFLINE;
 219         mutex_unlock(&wka->mutex);
 220 }
 221
 222 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs)
 223 {
 224         if (!gs)
 225                 return;
 226         zfcp_fc_wka_port_force_offline(&gs->ms);
 227         zfcp_fc_wka_port_force_offline(&gs->ts);
 228         zfcp_fc_wka_port_force_offline(&gs->ds);
 229         zfcp_fc_wka_port_force_offline(&gs->as);
 230 }
 231
 232 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
 233                                    struct fc_els_rscn_page *page)
 234 {
 235         unsigned long flags;
 236         struct zfcp_adapter *adapter = fsf_req->adapter;
 237         struct zfcp_port *port;
 238
 239         read_lock_irqsave(&adapter->port_list_lock, flags);
 240         list_for_each_entry(port, &adapter->port_list, list) {
 241                 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range))
 242                         zfcp_fc_test_link(port);
 243         }
 244         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 245 }
 246
 247 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 248 {
 249         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 250         struct zfcp_adapter *adapter = fsf_req->adapter;
 251         struct fc_els_rscn *head;
 252         struct fc_els_rscn_page *page;
 253         u16 i;
 254         u16 no_entries;
 255         unsigned int afmt;
 256
 257         head = (struct fc_els_rscn *) status_buffer->payload.data;
 258         page = (struct fc_els_rscn_page *) head;
 259
 260         /* see FC-FS */
 261         no_entries = be16_to_cpu(head->rscn_plen) /
 262                 sizeof(struct fc_els_rscn_page);
 263
 264         if (no_entries > 1) {
 265                 /* handle failed ports */
 266                 unsigned long flags;
 267                 struct zfcp_port *port;
 268
 269                 read_lock_irqsave(&adapter->port_list_lock, flags);
 270                 list_for_each_entry(port, &adapter->port_list, list) {
 271                         if (port->d_id)
 272                                 continue;
 273                         zfcp_erp_port_reopen(port,
 274                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 275                                              "fcrscn1");
 276                 }
 277                 read_unlock_irqrestore(&adapter->port_list_lock, flags);
 278         }
 279
 280         for (i = 1; i < no_entries; i++) {
 281                 /* skip head and start with 1st element */
 282                 page++;
 283                 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
 284                 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
 285                                        page);
 286                 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,
 287                                       *(u32 *)page);
 288         }
 289         zfcp_fc_conditional_port_scan(fsf_req->adapter);
 290 }
 291
 292 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 293 {
 294         unsigned long flags;
 295         struct zfcp_adapter *adapter = req->adapter;
 296         struct zfcp_port *port;
 297
 298         read_lock_irqsave(&adapter->port_list_lock, flags);
 299         list_for_each_entry(port, &adapter->port_list, list)
 300                 if (port->wwpn == wwpn) {
 301                         zfcp_erp_port_forced_reopen(port, 0, "fciwwp1");
 302                         break;
 303                 }
 304         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 305 }
 306
 307 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 308 {
 309         struct fsf_status_read_buffer *status_buffer;
 310         struct fc_els_flogi *plogi;
 311
 312         status_buffer = (struct fsf_status_read_buffer *) req->data;
 313         plogi = (struct fc_els_flogi *) status_buffer->payload.data;
 314         zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn));
 315 }
 316
 317 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 318 {
 319         struct fsf_status_read_buffer *status_buffer =
 320                 (struct fsf_status_read_buffer *)req->data;
 321         struct fc_els_logo *logo =
 322                 (struct fc_els_logo *) status_buffer->payload.data;
 323
 324         zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn));
 325 }
 326
 327 /**
 328  * zfcp_fc_incoming_els - handle incoming ELS
 329  * @fsf_req - request which contains incoming ELS
 330  */
 331 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 332 {
 333         struct fsf_status_read_buffer *status_buffer =
 334                 (struct fsf_status_read_buffer *) fsf_req->data;
 335         unsigned int els_type = status_buffer->payload.data[0];
 336
 337         zfcp_dbf_san_in_els("fciels1", fsf_req);
 338         if (els_type == ELS_PLOGI)
 339                 zfcp_fc_incoming_plogi(fsf_req);
 340         else if (els_type == ELS_LOGO)
 341                 zfcp_fc_incoming_logo(fsf_req);
 342         else if (els_type == ELS_RSCN)
 343                 zfcp_fc_incoming_rscn(fsf_req);
 344 }
 345
 346 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req)
 347 {
 348         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 349         struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 350
 351         if (ct_els->status)
 352                 return;
 353         if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC))
 354                 return;
 355
 356         /* looks like a valid d_id */
 357         ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid);
 358 }
 359
 360 static void zfcp_fc_complete(void *data)
 361 {
 362         complete(data);
 363 }
 364
 365 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size)
 366 {
 367         ct_hdr->ct_rev = FC_CT_REV;
 368         ct_hdr->ct_fs_type = FC_FST_DIR;
 369         ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE;
 370         ct_hdr->ct_cmd = cpu_to_be16(cmd);
 371         ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4);
 372 }
 373
 374 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
 375                                      struct zfcp_fc_req *fc_req)
 376 {
 377         struct zfcp_adapter *adapter = port->adapter;
 378         DECLARE_COMPLETION_ONSTACK(completion);
 379         struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req;
 380         struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 381         int ret;
 382
 383         /* setup parameters for send generic command */
 384         fc_req->ct_els.port = port;
 385         fc_req->ct_els.handler = zfcp_fc_complete;
 386         fc_req->ct_els.handler_data = &completion;
 387         fc_req->ct_els.req = &fc_req->sg_req;
 388         fc_req->ct_els.resp = &fc_req->sg_rsp;
 389         sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req));
 390         sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp));
 391
 392         zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr,
 393                            FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE);
 394         gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn);
 395
 396         ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els,
 397                                adapter->pool.gid_pn_req,
 398                                ZFCP_FC_CTELS_TMO);
 399         if (!ret) {
 400                 wait_for_completion(&completion);
 401                 zfcp_fc_ns_gid_pn_eval(fc_req);
 402         }
 403         return ret;
 404 }
 405
 406 /**
 407  * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request
 408  * @port: port where GID_PN request is needed
 409  * return: -ENOMEM on error, 0 otherwise
 410  */
 411 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
 412 {
 413         int ret;
 414         struct zfcp_fc_req *fc_req;
 415         struct zfcp_adapter *adapter = port->adapter;
 416
 417         fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC);
 418         if (!fc_req)
 419                 return -ENOMEM;
 420
 421         memset(fc_req, 0, sizeof(*fc_req));
 422
 423         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 424         if (ret)
 425                 goto out;
 426
 427         ret = zfcp_fc_ns_gid_pn_request(port, fc_req);
 428
 429         zfcp_fc_wka_port_put(&adapter->gs->ds);
 430 out:
 431         mempool_free(fc_req, adapter->pool.gid_pn);
 432         return ret;
 433 }
 434
 435 void zfcp_fc_port_did_lookup(struct work_struct *work)
 436 {
 437         int ret;
 438         struct zfcp_port *port = container_of(work, struct zfcp_port,
 439                                               gid_pn_work);
 440
 441         ret = zfcp_fc_ns_gid_pn(port);
 442         if (ret) {
 443                 /* could not issue gid_pn for some reason */
 444                 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1");
 445                 goto out;
 446         }
 447
 448         if (!port->d_id) {
 449                 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
 450                 goto out;
 451         }
 452
 453         zfcp_erp_port_reopen(port, 0, "fcgpn_3");
 454 out:
 455         put_device(&port->dev);
 456 }
 457
 458 /**
 459  * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request
 460  * @port: The zfcp_port to lookup the d_id for.
 461  */
 462 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)
 463 {
 464         get_device(&port->dev);
 465         if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))
 466                 put_device(&port->dev);
 467 }
 468
 469 /**
 470  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 471  * @port: zfcp_port structure
 472  * @plogi: plogi payload
 473  *
 474  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 475  */
 476 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi)
 477 {
 478         if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) {
 479                 port->d_id = 0;
 480                 dev_warn(&port->adapter->ccw_device->dev,
 481                          "A port opened with WWPN 0x%016Lx returned data that "
 482                          "identifies it as WWPN 0x%016Lx\n",
 483                          (unsigned long long) port->wwpn,
 484                          (unsigned long long) be64_to_cpu(plogi->fl_wwpn));
 485                 return;
 486         }
 487
 488         port->wwnn = be64_to_cpu(plogi->fl_wwnn);
 489         port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data);
 490
 491         if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID))
 492                 port->supported_classes |= FC_COS_CLASS1;
 493         if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID))
 494                 port->supported_classes |= FC_COS_CLASS2;
 495         if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID))
 496                 port->supported_classes |= FC_COS_CLASS3;
 497         if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID))
 498                 port->supported_classes |= FC_COS_CLASS4;
 499 }
 500
 501 static void zfcp_fc_adisc_handler(void *data)
 502 {
 503         struct zfcp_fc_req *fc_req = data;
 504         struct zfcp_port *port = fc_req->ct_els.port;
 505         struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp;
 506
 507         if (fc_req->ct_els.status) {
 508                 /* request rejected or timed out */
 509                 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 510                                             "fcadh_1");
 511                 goto out;
 512         }
 513
 514         if (!port->wwnn)
 515                 port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn);
 516
 517         if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) ||
 518             !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 519                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 520                                      "fcadh_2");
 521                 goto out;
 522         }
 523
 524         /* port is good, unblock rport without going through erp */
 525         zfcp_scsi_schedule_rport_register(port);
 526  out:
 527         atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 528         put_device(&port->dev);
 529         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 530 }
 531
 532 static int zfcp_fc_adisc(struct zfcp_port *port)
 533 {
 534         struct zfcp_fc_req *fc_req;
 535         struct zfcp_adapter *adapter = port->adapter;
 536         struct Scsi_Host *shost = adapter->scsi_host;
 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 = cpu_to_be64(fc_host_port_name(shost));
 557         fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(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         ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els,
 562                                 ZFCP_FC_CTELS_TMO);
 563         if (ret)
 564                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 565
 566         return ret;
 567 }
 568
 569 void zfcp_fc_link_test_work(struct work_struct *work)
 570 {
 571         struct zfcp_port *port =
 572                 container_of(work, struct zfcp_port, test_link_work);
 573         int retval;
 574
 575         get_device(&port->dev);
 576         port->rport_task = RPORT_DEL;
 577         zfcp_scsi_rport_work(&port->rport_work);
 578
 579         /* only issue one test command at one time per port */
 580         if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
 581                 goto out;
 582
 583         atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 584
 585         retval = zfcp_fc_adisc(port);
 586         if (retval == 0)
 587                 return;
 588
 589         /* send of ADISC was not possible */
 590         atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 591         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1");
 592
 593 out:
 594         put_device(&port->dev);
 595 }
 596
 597 /**
 598  * zfcp_fc_test_link - lightweight link test procedure
 599  * @port: port to be tested
 600  *
 601  * Test status of a link to a remote port using the ELS command ADISC.
 602  * If there is a problem with the remote port, error recovery steps
 603  * will be triggered.
 604  */
 605 void zfcp_fc_test_link(struct zfcp_port *port)
 606 {
 607         get_device(&port->dev);
 608         if (!queue_work(port->adapter->work_queue, &port->test_link_work))
 609                 put_device(&port->dev);
 610 }
 611
 612 static struct zfcp_fc_req *zfcp_alloc_sg_env(int buf_num)
 613 {
 614         struct zfcp_fc_req *fc_req;
 615
 616         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 617         if (!fc_req)
 618                 return NULL;
 619
 620         if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) {
 621                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 622                 return NULL;
 623         }
 624
 625         sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req,
 626                     sizeof(struct zfcp_fc_gpn_ft_req));
 627
 628         return fc_req;
 629 }
 630
 631 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req,
 632                                struct zfcp_adapter *adapter, int max_bytes)
 633 {
 634         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 635         struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req;
 636         DECLARE_COMPLETION_ONSTACK(completion);
 637         int ret;
 638
 639         zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes);
 640         req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;
 641
 642         ct_els->handler = zfcp_fc_complete;
 643         ct_els->handler_data = &completion;
 644         ct_els->req = &fc_req->sg_req;
 645         ct_els->resp = &fc_req->sg_rsp;
 646
 647         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 648                                ZFCP_FC_CTELS_TMO);
 649         if (!ret)
 650                 wait_for_completion(&completion);
 651         return ret;
 652 }
 653
 654 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
 655 {
 656         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 657                 return;
 658
 659         atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status);
 660
 661         if ((port->supported_classes != 0) ||
 662             !list_empty(&port->unit_list))
 663                 return;
 664
 665         list_move_tail(&port->list, lh);
 666 }
 667
 668 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,
 669                                struct zfcp_adapter *adapter, int max_entries)
 670 {
 671         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 672         struct scatterlist *sg = &fc_req->sg_rsp;
 673         struct fc_ct_hdr *hdr = sg_virt(sg);
 674         struct fc_gpn_ft_resp *acc = sg_virt(sg);
 675         struct zfcp_port *port, *tmp;
 676         unsigned long flags;
 677         LIST_HEAD(remove_lh);
 678         u32 d_id;
 679         int ret = 0, x, last = 0;
 680
 681         if (ct_els->status)
 682                 return -EIO;
 683
 684         if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) {
 685                 if (hdr->ct_reason == FC_FS_RJT_UNABL)
 686                         return -EAGAIN; /* might be a temporary condition */
 687                 return -EIO;
 688         }
 689
 690         if (hdr->ct_mr_size) {
 691                 dev_warn(&adapter->ccw_device->dev,
 692                          "The name server reported %d words residual data\n",
 693                          hdr->ct_mr_size);
 694                 return -E2BIG;
 695         }
 696
 697         /* first entry is the header */
 698         for (x = 1; x < max_entries && !last; x++) {
 699                 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
 700                         acc++;
 701                 else
 702                         acc = sg_virt(++sg);
 703
 704                 last = acc->fp_flags & FC_NS_FID_LAST;
 705                 d_id = ntoh24(acc->fp_fid);
 706
 707                 /* don't attach ports with a well known address */
 708                 if (d_id >= FC_FID_WELL_KNOWN_BASE)
 709                         continue;
 710                 /* skip the adapter's port and known remote ports */
 711                 if (be64_to_cpu(acc->fp_wwpn) ==
 712                     fc_host_port_name(adapter->scsi_host))
 713                         continue;
 714
 715                 port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn),
 716                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 717                 if (!IS_ERR(port))
 718                         zfcp_erp_port_reopen(port, 0, "fcegpf1");
 719                 else if (PTR_ERR(port) != -EEXIST)
 720                         ret = PTR_ERR(port);
 721         }
 722
 723         zfcp_erp_wait(adapter);
 724         write_lock_irqsave(&adapter->port_list_lock, flags);
 725         list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
 726                 zfcp_fc_validate_port(port, &remove_lh);
 727         write_unlock_irqrestore(&adapter->port_list_lock, flags);
 728
 729         list_for_each_entry_safe(port, tmp, &remove_lh, list) {
 730                 zfcp_erp_port_shutdown(port, 0, "fcegpf2");
 731                 device_unregister(&port->dev);
 732         }
 733
 734         return ret;
 735 }
 736
 737 /**
 738  * zfcp_fc_scan_ports - scan remote ports and attach new ports
 739  * @work: reference to scheduled work
 740  */
 741 void zfcp_fc_scan_ports(struct work_struct *work)
 742 {
 743         struct delayed_work *dw = to_delayed_work(work);
 744         struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter,
 745                                                     scan_work);
 746         int ret, i;
 747         struct zfcp_fc_req *fc_req;
 748         int chain, max_entries, buf_num, max_bytes;
 749
 750         zfcp_fc_port_scan_time(adapter);
 751
 752         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 753         buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1;
 754         max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE;
 755         max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE;
 756
 757         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 758             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 759                 return;
 760
 761         if (zfcp_fc_wka_port_get(&adapter->gs->ds))
 762                 return;
 763
 764         fc_req = zfcp_alloc_sg_env(buf_num);
 765         if (!fc_req)
 766                 goto out;
 767
 768         for (i = 0; i < 3; i++) {
 769                 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes);
 770                 if (!ret) {
 771                         ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries);
 772                         if (ret == -EAGAIN)
 773                                 ssleep(1);
 774                         else
 775                                 break;
 776                 }
 777         }
 778         zfcp_sg_free_table(&fc_req->sg_rsp, buf_num);
 779         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 780 out:
 781         zfcp_fc_wka_port_put(&adapter->gs->ds);
 782 }
 783
 784 static int zfcp_fc_gspn(struct zfcp_adapter *adapter,
 785                         struct zfcp_fc_req *fc_req)
 786 {
 787         DECLARE_COMPLETION_ONSTACK(completion);
 788         char devno[] = "DEVNO:";
 789         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 790         struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req;
 791         struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp;
 792         int ret;
 793
 794         zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID,
 795                            FC_SYMBOLIC_NAME_SIZE);
 796         hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host));
 797
 798         sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req));
 799         sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp));
 800
 801         ct_els->handler = zfcp_fc_complete;
 802         ct_els->handler_data = &completion;
 803         ct_els->req = &fc_req->sg_req;
 804         ct_els->resp = &fc_req->sg_rsp;
 805
 806         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 807                                ZFCP_FC_CTELS_TMO);
 808         if (ret)
 809                 return ret;
 810
 811         wait_for_completion(&completion);
 812         if (ct_els->status)
 813                 return ct_els->status;
 814
 815         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV &&
 816             !(strstr(gspn_rsp->gspn.fp_name, devno)))
 817                 snprintf(fc_host_symbolic_name(adapter->scsi_host),
 818                          FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s",
 819                          gspn_rsp->gspn.fp_name, devno,
 820                          dev_name(&adapter->ccw_device->dev),
 821                          init_utsname()->nodename);
 822         else
 823                 strlcpy(fc_host_symbolic_name(adapter->scsi_host),
 824                         gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE);
 825
 826         return 0;
 827 }
 828
 829 static void zfcp_fc_rspn(struct zfcp_adapter *adapter,
 830                          struct zfcp_fc_req *fc_req)
 831 {
 832         DECLARE_COMPLETION_ONSTACK(completion);
 833         struct Scsi_Host *shost = adapter->scsi_host;
 834         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 835         struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req;
 836         struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp;
 837         int ret, len;
 838
 839         zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID,
 840                            FC_SYMBOLIC_NAME_SIZE);
 841         hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost));
 842         len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost),
 843                       FC_SYMBOLIC_NAME_SIZE);
 844         rspn_req->rspn.fr_name_len = len;
 845
 846         sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req));
 847         sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp));
 848
 849         ct_els->handler = zfcp_fc_complete;
 850         ct_els->handler_data = &completion;
 851         ct_els->req = &fc_req->sg_req;
 852         ct_els->resp = &fc_req->sg_rsp;
 853
 854         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 855                                ZFCP_FC_CTELS_TMO);
 856         if (!ret)
 857                 wait_for_completion(&completion);
 858 }
 859
 860 /**
 861  * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name
 862  * @work: ns_up_work of the adapter where to update the symbolic port name
 863  *
 864  * Retrieve the current symbolic port name that may have been set by
 865  * the hardware using the GSPN request and update the fc_host
 866  * symbolic_name sysfs attribute. When running in NPIV mode (and hence
 867  * the port name is unique for this system), update the symbolic port
 868  * name to add Linux specific information and update the FC nameserver
 869  * using the RSPN request.
 870  */
 871 void zfcp_fc_sym_name_update(struct work_struct *work)
 872 {
 873         struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
 874                                                     ns_up_work);
 875         int ret;
 876         struct zfcp_fc_req *fc_req;
 877
 878         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 879             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 880                 return;
 881
 882         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 883         if (!fc_req)
 884                 return;
 885
 886         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 887         if (ret)
 888                 goto out_free;
 889
 890         ret = zfcp_fc_gspn(adapter, fc_req);
 891         if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 892                 goto out_ds_put;
 893
 894         memset(fc_req, 0, sizeof(*fc_req));
 895         zfcp_fc_rspn(adapter, fc_req);
 896
 897 out_ds_put:
 898         zfcp_fc_wka_port_put(&adapter->gs->ds);
 899 out_free:
 900         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 901 }
 902
 903 static void zfcp_fc_ct_els_job_handler(void *data)
 904 {
 905         struct bsg_job *job = data;
 906         struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data;
 907         struct fc_bsg_reply *jr = job->reply;
 908
 909         jr->reply_payload_rcv_len = job->reply_payload.payload_len;
 910         jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
 911         jr->result = zfcp_ct_els->status ? -EIO : 0;
 912         bsg_job_done(job, jr->result, jr->reply_payload_rcv_len);
 913 }
 914
 915 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job)
 916 {
 917         u32 preamble_word1;
 918         u8 gs_type;
 919         struct zfcp_adapter *adapter;
 920         struct fc_bsg_request *bsg_request = job->request;
 921         struct fc_rport *rport = fc_bsg_to_rport(job);
 922         struct Scsi_Host *shost;
 923
 924         preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1;
 925         gs_type = (preamble_word1 & 0xff000000) >> 24;
 926
 927         shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
 928         adapter = (struct zfcp_adapter *) shost->hostdata[0];
 929
 930         switch (gs_type) {
 931         case FC_FST_ALIAS:
 932                 return &adapter->gs->as;
 933         case FC_FST_MGMT:
 934                 return &adapter->gs->ms;
 935         case FC_FST_TIME:
 936                 return &adapter->gs->ts;
 937                 break;
 938         case FC_FST_DIR:
 939                 return &adapter->gs->ds;
 940                 break;
 941         default:
 942                 return NULL;
 943         }
 944 }
 945
 946 static void zfcp_fc_ct_job_handler(void *data)
 947 {
 948         struct bsg_job *job = data;
 949         struct zfcp_fc_wka_port *wka_port;
 950
 951         wka_port = zfcp_fc_job_wka_port(job);
 952         zfcp_fc_wka_port_put(wka_port);
 953
 954         zfcp_fc_ct_els_job_handler(data);
 955 }
 956
 957 static int zfcp_fc_exec_els_job(struct bsg_job *job,
 958                                 struct zfcp_adapter *adapter)
 959 {
 960         struct zfcp_fsf_ct_els *els = job->dd_data;
 961         struct fc_rport *rport = fc_bsg_to_rport(job);
 962         struct fc_bsg_request *bsg_request = job->request;
 963         struct zfcp_port *port;
 964         u32 d_id;
 965
 966         if (rport) {
 967                 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 968                 if (!port)
 969                         return -EINVAL;
 970
 971                 d_id = port->d_id;
 972                 put_device(&port->dev);
 973         } else
 974                 d_id = ntoh24(bsg_request->rqst_data.h_els.port_id);
 975
 976         els->handler = zfcp_fc_ct_els_job_handler;
 977         return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ);
 978 }
 979
 980 static int zfcp_fc_exec_ct_job(struct bsg_job *job,
 981                                struct zfcp_adapter *adapter)
 982 {
 983         int ret;
 984         struct zfcp_fsf_ct_els *ct = job->dd_data;
 985         struct zfcp_fc_wka_port *wka_port;
 986
 987         wka_port = zfcp_fc_job_wka_port(job);
 988         if (!wka_port)
 989                 return -EINVAL;
 990
 991         ret = zfcp_fc_wka_port_get(wka_port);
 992         if (ret)
 993                 return ret;
 994
 995         ct->handler = zfcp_fc_ct_job_handler;
 996         ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ);
 997         if (ret)
 998                 zfcp_fc_wka_port_put(wka_port);
 999
1000         return ret;
1001 }
1002
1003 int zfcp_fc_exec_bsg_job(struct bsg_job *job)
1004 {
1005         struct Scsi_Host *shost;
1006         struct zfcp_adapter *adapter;
1007         struct zfcp_fsf_ct_els *ct_els = job->dd_data;
1008         struct fc_bsg_request *bsg_request = job->request;
1009         struct fc_rport *rport = fc_bsg_to_rport(job);
1010
1011         shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
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 (bsg_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 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