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         int ret = -EIO;
 150
 151         if (mutex_lock_interruptible(&wka_port->mutex))
 152                 return -ERESTARTSYS;
 153
 154         if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE ||
 155             wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) {
 156                 wka_port->status = ZFCP_FC_WKA_PORT_OPENING;
 157                 if (zfcp_fsf_open_wka_port(wka_port)) {
 158                         /* could not even send request, nothing to wait for */
 159                         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 160                         goto out;
 161                 }
 162         }
 163
 164         wait_event(wka_port->opened,
 165                    wka_port->status == ZFCP_FC_WKA_PORT_ONLINE ||
 166                    wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
 167
 168         if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) {
 169                 atomic_inc(&wka_port->refcount);
 170                 ret = 0;
 171                 goto out;
 172         }
 173 out:
 174         mutex_unlock(&wka_port->mutex);
 175         return ret;
 176 }
 177
 178 static void zfcp_fc_wka_port_offline(struct work_struct *work)
 179 {
 180         struct delayed_work *dw = to_delayed_work(work);
 181         struct zfcp_fc_wka_port *wka_port =
 182                         container_of(dw, struct zfcp_fc_wka_port, work);
 183
 184         mutex_lock(&wka_port->mutex);
 185         if ((atomic_read(&wka_port->refcount) != 0) ||
 186             (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE))
 187                 goto out;
 188
 189         wka_port->status = ZFCP_FC_WKA_PORT_CLOSING;
 190         if (zfcp_fsf_close_wka_port(wka_port)) {
 191                 /* could not even send request, nothing to wait for */
 192                 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 193                 goto out;
 194         }
 195         wait_event(wka_port->closed,
 196                    wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
 197 out:
 198         mutex_unlock(&wka_port->mutex);
 199 }
 200
 201 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port)
 202 {
 203         if (atomic_dec_return(&wka_port->refcount) != 0)
 204                 return;
 205         /* wait 10 milliseconds, other reqs might pop in */
 206         queue_delayed_work(wka_port->adapter->work_queue, &wka_port->work,
 207                            msecs_to_jiffies(10));
 208 }
 209
 210 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id,
 211                                   struct zfcp_adapter *adapter)
 212 {
 213         init_waitqueue_head(&wka_port->opened);
 214         init_waitqueue_head(&wka_port->closed);
 215
 216         wka_port->adapter = adapter;
 217         wka_port->d_id = d_id;
 218
 219         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 220         atomic_set(&wka_port->refcount, 0);
 221         mutex_init(&wka_port->mutex);
 222         INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline);
 223 }
 224
 225 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka)
 226 {
 227         cancel_delayed_work_sync(&wka->work);
 228         mutex_lock(&wka->mutex);
 229         wka->status = ZFCP_FC_WKA_PORT_OFFLINE;
 230         mutex_unlock(&wka->mutex);
 231 }
 232
 233 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs)
 234 {
 235         if (!gs)
 236                 return;
 237         zfcp_fc_wka_port_force_offline(&gs->ms);
 238         zfcp_fc_wka_port_force_offline(&gs->ts);
 239         zfcp_fc_wka_port_force_offline(&gs->ds);
 240         zfcp_fc_wka_port_force_offline(&gs->as);
 241 }
 242
 243 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
 244                                    struct fc_els_rscn_page *page)
 245 {
 246         unsigned long flags;
 247         struct zfcp_adapter *adapter = fsf_req->adapter;
 248         struct zfcp_port *port;
 249
 250         read_lock_irqsave(&adapter->port_list_lock, flags);
 251         list_for_each_entry(port, &adapter->port_list, list) {
 252                 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range))
 253                         zfcp_fc_test_link(port);
 254         }
 255         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 256 }
 257
 258 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 259 {
 260         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 261         struct zfcp_adapter *adapter = fsf_req->adapter;
 262         struct fc_els_rscn *head;
 263         struct fc_els_rscn_page *page;
 264         u16 i;
 265         u16 no_entries;
 266         unsigned int afmt;
 267
 268         head = (struct fc_els_rscn *) status_buffer->payload.data;
 269         page = (struct fc_els_rscn_page *) head;
 270
 271         /* see FC-FS */
 272         no_entries = be16_to_cpu(head->rscn_plen) /
 273                 sizeof(struct fc_els_rscn_page);
 274
 275         if (no_entries > 1) {
 276                 /* handle failed ports */
 277                 unsigned long flags;
 278                 struct zfcp_port *port;
 279
 280                 read_lock_irqsave(&adapter->port_list_lock, flags);
 281                 list_for_each_entry(port, &adapter->port_list, list) {
 282                         if (port->d_id)
 283                                 continue;
 284                         zfcp_erp_port_reopen(port,
 285                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 286                                              "fcrscn1");
 287                 }
 288                 read_unlock_irqrestore(&adapter->port_list_lock, flags);
 289         }
 290
 291         for (i = 1; i < no_entries; i++) {
 292                 /* skip head and start with 1st element */
 293                 page++;
 294                 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
 295                 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
 296                                        page);
 297                 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,
 298                                       *(u32 *)page);
 299         }
 300         zfcp_fc_conditional_port_scan(fsf_req->adapter);
 301 }
 302
 303 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 304 {
 305         unsigned long flags;
 306         struct zfcp_adapter *adapter = req->adapter;
 307         struct zfcp_port *port;
 308
 309         read_lock_irqsave(&adapter->port_list_lock, flags);
 310         list_for_each_entry(port, &adapter->port_list, list)
 311                 if (port->wwpn == wwpn) {
 312                         zfcp_erp_port_forced_reopen(port, 0, "fciwwp1");
 313                         break;
 314                 }
 315         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 316 }
 317
 318 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 319 {
 320         struct fsf_status_read_buffer *status_buffer;
 321         struct fc_els_flogi *plogi;
 322
 323         status_buffer = (struct fsf_status_read_buffer *) req->data;
 324         plogi = (struct fc_els_flogi *) status_buffer->payload.data;
 325         zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn));
 326 }
 327
 328 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 329 {
 330         struct fsf_status_read_buffer *status_buffer =
 331                 (struct fsf_status_read_buffer *)req->data;
 332         struct fc_els_logo *logo =
 333                 (struct fc_els_logo *) status_buffer->payload.data;
 334
 335         zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn));
 336 }
 337
 338 /**
 339  * zfcp_fc_incoming_els - handle incoming ELS
 340  * @fsf_req - request which contains incoming ELS
 341  */
 342 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 343 {
 344         struct fsf_status_read_buffer *status_buffer =
 345                 (struct fsf_status_read_buffer *) fsf_req->data;
 346         unsigned int els_type = status_buffer->payload.data[0];
 347
 348         zfcp_dbf_san_in_els("fciels1", fsf_req);
 349         if (els_type == ELS_PLOGI)
 350                 zfcp_fc_incoming_plogi(fsf_req);
 351         else if (els_type == ELS_LOGO)
 352                 zfcp_fc_incoming_logo(fsf_req);
 353         else if (els_type == ELS_RSCN)
 354                 zfcp_fc_incoming_rscn(fsf_req);
 355 }
 356
 357 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req)
 358 {
 359         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 360         struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 361
 362         if (ct_els->status)
 363                 return;
 364         if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC))
 365                 return;
 366
 367         /* looks like a valid d_id */
 368         ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid);
 369 }
 370
 371 static void zfcp_fc_complete(void *data)
 372 {
 373         complete(data);
 374 }
 375
 376 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size)
 377 {
 378         ct_hdr->ct_rev = FC_CT_REV;
 379         ct_hdr->ct_fs_type = FC_FST_DIR;
 380         ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE;
 381         ct_hdr->ct_cmd = cpu_to_be16(cmd);
 382         ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4);
 383 }
 384
 385 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
 386                                      struct zfcp_fc_req *fc_req)
 387 {
 388         struct zfcp_adapter *adapter = port->adapter;
 389         DECLARE_COMPLETION_ONSTACK(completion);
 390         struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req;
 391         struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 392         int ret;
 393
 394         /* setup parameters for send generic command */
 395         fc_req->ct_els.port = port;
 396         fc_req->ct_els.handler = zfcp_fc_complete;
 397         fc_req->ct_els.handler_data = &completion;
 398         fc_req->ct_els.req = &fc_req->sg_req;
 399         fc_req->ct_els.resp = &fc_req->sg_rsp;
 400         sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req));
 401         sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp));
 402
 403         zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr,
 404                            FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE);
 405         gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn);
 406
 407         ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els,
 408                                adapter->pool.gid_pn_req,
 409                                ZFCP_FC_CTELS_TMO);
 410         if (!ret) {
 411                 wait_for_completion(&completion);
 412                 zfcp_fc_ns_gid_pn_eval(fc_req);
 413         }
 414         return ret;
 415 }
 416
 417 /**
 418  * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request
 419  * @port: port where GID_PN request is needed
 420  * return: -ENOMEM on error, 0 otherwise
 421  */
 422 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
 423 {
 424         int ret;
 425         struct zfcp_fc_req *fc_req;
 426         struct zfcp_adapter *adapter = port->adapter;
 427
 428         fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC);
 429         if (!fc_req)
 430                 return -ENOMEM;
 431
 432         memset(fc_req, 0, sizeof(*fc_req));
 433
 434         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 435         if (ret)
 436                 goto out;
 437
 438         ret = zfcp_fc_ns_gid_pn_request(port, fc_req);
 439
 440         zfcp_fc_wka_port_put(&adapter->gs->ds);
 441 out:
 442         mempool_free(fc_req, adapter->pool.gid_pn);
 443         return ret;
 444 }
 445
 446 void zfcp_fc_port_did_lookup(struct work_struct *work)
 447 {
 448         int ret;
 449         struct zfcp_port *port = container_of(work, struct zfcp_port,
 450                                               gid_pn_work);
 451
 452         ret = zfcp_fc_ns_gid_pn(port);
 453         if (ret) {
 454                 /* could not issue gid_pn for some reason */
 455                 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1");
 456                 goto out;
 457         }
 458
 459         if (!port->d_id) {
 460                 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
 461                 goto out;
 462         }
 463
 464         zfcp_erp_port_reopen(port, 0, "fcgpn_3");
 465 out:
 466         put_device(&port->dev);
 467 }
 468
 469 /**
 470  * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request
 471  * @port: The zfcp_port to lookup the d_id for.
 472  */
 473 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)
 474 {
 475         get_device(&port->dev);
 476         if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))
 477                 put_device(&port->dev);
 478 }
 479
 480 /**
 481  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 482  * @port: zfcp_port structure
 483  * @plogi: plogi payload
 484  *
 485  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 486  */
 487 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi)
 488 {
 489         if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) {
 490                 port->d_id = 0;
 491                 dev_warn(&port->adapter->ccw_device->dev,
 492                          "A port opened with WWPN 0x%016Lx returned data that "
 493                          "identifies it as WWPN 0x%016Lx\n",
 494                          (unsigned long long) port->wwpn,
 495                          (unsigned long long) be64_to_cpu(plogi->fl_wwpn));
 496                 return;
 497         }
 498
 499         port->wwnn = be64_to_cpu(plogi->fl_wwnn);
 500         port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data);
 501
 502         if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID))
 503                 port->supported_classes |= FC_COS_CLASS1;
 504         if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID))
 505                 port->supported_classes |= FC_COS_CLASS2;
 506         if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID))
 507                 port->supported_classes |= FC_COS_CLASS3;
 508         if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID))
 509                 port->supported_classes |= FC_COS_CLASS4;
 510 }
 511
 512 static void zfcp_fc_adisc_handler(void *data)
 513 {
 514         struct zfcp_fc_req *fc_req = data;
 515         struct zfcp_port *port = fc_req->ct_els.port;
 516         struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp;
 517
 518         if (fc_req->ct_els.status) {
 519                 /* request rejected or timed out */
 520                 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 521                                             "fcadh_1");
 522                 goto out;
 523         }
 524
 525         if (!port->wwnn)
 526                 port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn);
 527
 528         if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) ||
 529             !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 530                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 531                                      "fcadh_2");
 532                 goto out;
 533         }
 534
 535         /* re-init to undo drop from zfcp_fc_adisc() */
 536         port->d_id = ntoh24(adisc_resp->adisc_port_id);
 537         /* port is good, unblock rport without going through erp */
 538         zfcp_scsi_schedule_rport_register(port);
 539  out:
 540         atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 541         put_device(&port->dev);
 542         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 543 }
 544
 545 static int zfcp_fc_adisc(struct zfcp_port *port)
 546 {
 547         struct zfcp_fc_req *fc_req;
 548         struct zfcp_adapter *adapter = port->adapter;
 549         struct Scsi_Host *shost = adapter->scsi_host;
 550         u32 d_id;
 551         int ret;
 552
 553         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC);
 554         if (!fc_req)
 555                 return -ENOMEM;
 556
 557         fc_req->ct_els.port = port;
 558         fc_req->ct_els.req = &fc_req->sg_req;
 559         fc_req->ct_els.resp = &fc_req->sg_rsp;
 560         sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req,
 561                     sizeof(struct fc_els_adisc));
 562         sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp,
 563                     sizeof(struct fc_els_adisc));
 564
 565         fc_req->ct_els.handler = zfcp_fc_adisc_handler;
 566         fc_req->ct_els.handler_data = fc_req;
 567
 568         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 569            without FC-AL-2 capability, so we don't set it */
 570         fc_req->u.adisc.req.adisc_wwpn = cpu_to_be64(fc_host_port_name(shost));
 571         fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(fc_host_node_name(shost));
 572         fc_req->u.adisc.req.adisc_cmd = ELS_ADISC;
 573         hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost));
 574
 575         d_id = port->d_id; /* remember as destination for send els below */
 576         /*
 577          * Force fresh GID_PN lookup on next port recovery.
 578          * Must happen after request setup and before sending request,
 579          * to prevent race with port->d_id re-init in zfcp_fc_adisc_handler().
 580          */
 581         port->d_id = 0;
 582
 583         ret = zfcp_fsf_send_els(adapter, d_id, &fc_req->ct_els,
 584                                 ZFCP_FC_CTELS_TMO);
 585         if (ret)
 586                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 587
 588         return ret;
 589 }
 590
 591 void zfcp_fc_link_test_work(struct work_struct *work)
 592 {
 593         struct zfcp_port *port =
 594                 container_of(work, struct zfcp_port, test_link_work);
 595         int retval;
 596
 597         get_device(&port->dev);
 598         port->rport_task = RPORT_DEL;
 599         zfcp_scsi_rport_work(&port->rport_work);
 600
 601         /* only issue one test command at one time per port */
 602         if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
 603                 goto out;
 604
 605         atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 606
 607         retval = zfcp_fc_adisc(port);
 608         if (retval == 0)
 609                 return;
 610
 611         /* send of ADISC was not possible */
 612         atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 613         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1");
 614
 615 out:
 616         put_device(&port->dev);
 617 }
 618
 619 /**
 620  * zfcp_fc_test_link - lightweight link test procedure
 621  * @port: port to be tested
 622  *
 623  * Test status of a link to a remote port using the ELS command ADISC.
 624  * If there is a problem with the remote port, error recovery steps
 625  * will be triggered.
 626  */
 627 void zfcp_fc_test_link(struct zfcp_port *port)
 628 {
 629         get_device(&port->dev);
 630         if (!queue_work(port->adapter->work_queue, &port->test_link_work))
 631                 put_device(&port->dev);
 632 }
 633
 634 static struct zfcp_fc_req *zfcp_alloc_sg_env(int buf_num)
 635 {
 636         struct zfcp_fc_req *fc_req;
 637
 638         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 639         if (!fc_req)
 640                 return NULL;
 641
 642         if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) {
 643                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 644                 return NULL;
 645         }
 646
 647         sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req,
 648                     sizeof(struct zfcp_fc_gpn_ft_req));
 649
 650         return fc_req;
 651 }
 652
 653 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req,
 654                                struct zfcp_adapter *adapter, int max_bytes)
 655 {
 656         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 657         struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req;
 658         DECLARE_COMPLETION_ONSTACK(completion);
 659         int ret;
 660
 661         zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes);
 662         req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;
 663
 664         ct_els->handler = zfcp_fc_complete;
 665         ct_els->handler_data = &completion;
 666         ct_els->req = &fc_req->sg_req;
 667         ct_els->resp = &fc_req->sg_rsp;
 668
 669         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 670                                ZFCP_FC_CTELS_TMO);
 671         if (!ret)
 672                 wait_for_completion(&completion);
 673         return ret;
 674 }
 675
 676 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
 677 {
 678         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 679                 return;
 680
 681         atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status);
 682
 683         if ((port->supported_classes != 0) ||
 684             !list_empty(&port->unit_list))
 685                 return;
 686
 687         list_move_tail(&port->list, lh);
 688 }
 689
 690 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,
 691                                struct zfcp_adapter *adapter, int max_entries)
 692 {
 693         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 694         struct scatterlist *sg = &fc_req->sg_rsp;
 695         struct fc_ct_hdr *hdr = sg_virt(sg);
 696         struct fc_gpn_ft_resp *acc = sg_virt(sg);
 697         struct zfcp_port *port, *tmp;
 698         unsigned long flags;
 699         LIST_HEAD(remove_lh);
 700         u32 d_id;
 701         int ret = 0, x, last = 0;
 702
 703         if (ct_els->status)
 704                 return -EIO;
 705
 706         if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) {
 707                 if (hdr->ct_reason == FC_FS_RJT_UNABL)
 708                         return -EAGAIN; /* might be a temporary condition */
 709                 return -EIO;
 710         }
 711
 712         if (hdr->ct_mr_size) {
 713                 dev_warn(&adapter->ccw_device->dev,
 714                          "The name server reported %d words residual data\n",
 715                          hdr->ct_mr_size);
 716                 return -E2BIG;
 717         }
 718
 719         /* first entry is the header */
 720         for (x = 1; x < max_entries && !last; x++) {
 721                 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
 722                         acc++;
 723                 else
 724                         acc = sg_virt(++sg);
 725
 726                 last = acc->fp_flags & FC_NS_FID_LAST;
 727                 d_id = ntoh24(acc->fp_fid);
 728
 729                 /* don't attach ports with a well known address */
 730                 if (d_id >= FC_FID_WELL_KNOWN_BASE)
 731                         continue;
 732                 /* skip the adapter's port and known remote ports */
 733                 if (be64_to_cpu(acc->fp_wwpn) ==
 734                     fc_host_port_name(adapter->scsi_host))
 735                         continue;
 736
 737                 port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn),
 738                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 739                 if (!IS_ERR(port))
 740                         zfcp_erp_port_reopen(port, 0, "fcegpf1");
 741                 else if (PTR_ERR(port) != -EEXIST)
 742                         ret = PTR_ERR(port);
 743         }
 744
 745         zfcp_erp_wait(adapter);
 746         write_lock_irqsave(&adapter->port_list_lock, flags);
 747         list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
 748                 zfcp_fc_validate_port(port, &remove_lh);
 749         write_unlock_irqrestore(&adapter->port_list_lock, flags);
 750
 751         list_for_each_entry_safe(port, tmp, &remove_lh, list) {
 752                 zfcp_erp_port_shutdown(port, 0, "fcegpf2");
 753                 device_unregister(&port->dev);
 754         }
 755
 756         return ret;
 757 }
 758
 759 /**
 760  * zfcp_fc_scan_ports - scan remote ports and attach new ports
 761  * @work: reference to scheduled work
 762  */
 763 void zfcp_fc_scan_ports(struct work_struct *work)
 764 {
 765         struct delayed_work *dw = to_delayed_work(work);
 766         struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter,
 767                                                     scan_work);
 768         int ret, i;
 769         struct zfcp_fc_req *fc_req;
 770         int chain, max_entries, buf_num, max_bytes;
 771
 772         zfcp_fc_port_scan_time(adapter);
 773
 774         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 775         buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1;
 776         max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE;
 777         max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE;
 778
 779         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 780             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 781                 return;
 782
 783         if (zfcp_fc_wka_port_get(&adapter->gs->ds))
 784                 return;
 785
 786         fc_req = zfcp_alloc_sg_env(buf_num);
 787         if (!fc_req)
 788                 goto out;
 789
 790         for (i = 0; i < 3; i++) {
 791                 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes);
 792                 if (!ret) {
 793                         ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries);
 794                         if (ret == -EAGAIN)
 795                                 ssleep(1);
 796                         else
 797                                 break;
 798                 }
 799         }
 800         zfcp_sg_free_table(&fc_req->sg_rsp, buf_num);
 801         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 802 out:
 803         zfcp_fc_wka_port_put(&adapter->gs->ds);
 804 }
 805
 806 static int zfcp_fc_gspn(struct zfcp_adapter *adapter,
 807                         struct zfcp_fc_req *fc_req)
 808 {
 809         DECLARE_COMPLETION_ONSTACK(completion);
 810         char devno[] = "DEVNO:";
 811         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 812         struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req;
 813         struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp;
 814         int ret;
 815
 816         zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID,
 817                            FC_SYMBOLIC_NAME_SIZE);
 818         hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host));
 819
 820         sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req));
 821         sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp));
 822
 823         ct_els->handler = zfcp_fc_complete;
 824         ct_els->handler_data = &completion;
 825         ct_els->req = &fc_req->sg_req;
 826         ct_els->resp = &fc_req->sg_rsp;
 827
 828         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 829                                ZFCP_FC_CTELS_TMO);
 830         if (ret)
 831                 return ret;
 832
 833         wait_for_completion(&completion);
 834         if (ct_els->status)
 835                 return ct_els->status;
 836
 837         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV &&
 838             !(strstr(gspn_rsp->gspn.fp_name, devno)))
 839                 snprintf(fc_host_symbolic_name(adapter->scsi_host),
 840                          FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s",
 841                          gspn_rsp->gspn.fp_name, devno,
 842                          dev_name(&adapter->ccw_device->dev),
 843                          init_utsname()->nodename);
 844         else
 845                 strlcpy(fc_host_symbolic_name(adapter->scsi_host),
 846                         gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE);
 847
 848         return 0;
 849 }
 850
 851 static void zfcp_fc_rspn(struct zfcp_adapter *adapter,
 852                          struct zfcp_fc_req *fc_req)
 853 {
 854         DECLARE_COMPLETION_ONSTACK(completion);
 855         struct Scsi_Host *shost = adapter->scsi_host;
 856         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 857         struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req;
 858         struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp;
 859         int ret, len;
 860
 861         zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID,
 862                            FC_SYMBOLIC_NAME_SIZE);
 863         hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost));
 864         len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost),
 865                       FC_SYMBOLIC_NAME_SIZE);
 866         rspn_req->rspn.fr_name_len = len;
 867
 868         sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req));
 869         sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp));
 870
 871         ct_els->handler = zfcp_fc_complete;
 872         ct_els->handler_data = &completion;
 873         ct_els->req = &fc_req->sg_req;
 874         ct_els->resp = &fc_req->sg_rsp;
 875
 876         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 877                                ZFCP_FC_CTELS_TMO);
 878         if (!ret)
 879                 wait_for_completion(&completion);
 880 }
 881
 882 /**
 883  * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name
 884  * @work: ns_up_work of the adapter where to update the symbolic port name
 885  *
 886  * Retrieve the current symbolic port name that may have been set by
 887  * the hardware using the GSPN request and update the fc_host
 888  * symbolic_name sysfs attribute. When running in NPIV mode (and hence
 889  * the port name is unique for this system), update the symbolic port
 890  * name to add Linux specific information and update the FC nameserver
 891  * using the RSPN request.
 892  */
 893 void zfcp_fc_sym_name_update(struct work_struct *work)
 894 {
 895         struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
 896                                                     ns_up_work);
 897         int ret;
 898         struct zfcp_fc_req *fc_req;
 899
 900         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 901             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 902                 return;
 903
 904         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 905         if (!fc_req)
 906                 return;
 907
 908         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 909         if (ret)
 910                 goto out_free;
 911
 912         ret = zfcp_fc_gspn(adapter, fc_req);
 913         if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 914                 goto out_ds_put;
 915
 916         memset(fc_req, 0, sizeof(*fc_req));
 917         zfcp_fc_rspn(adapter, fc_req);
 918
 919 out_ds_put:
 920         zfcp_fc_wka_port_put(&adapter->gs->ds);
 921 out_free:
 922         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 923 }
 924
 925 static void zfcp_fc_ct_els_job_handler(void *data)
 926 {
 927         struct bsg_job *job = data;
 928         struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data;
 929         struct fc_bsg_reply *jr = job->reply;
 930
 931         jr->reply_payload_rcv_len = job->reply_payload.payload_len;
 932         jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
 933         jr->result = zfcp_ct_els->status ? -EIO : 0;
 934         bsg_job_done(job, jr->result, jr->reply_payload_rcv_len);
 935 }
 936
 937 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job)
 938 {
 939         u32 preamble_word1;
 940         u8 gs_type;
 941         struct zfcp_adapter *adapter;
 942         struct fc_bsg_request *bsg_request = job->request;
 943         struct fc_rport *rport = fc_bsg_to_rport(job);
 944         struct Scsi_Host *shost;
 945
 946         preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1;
 947         gs_type = (preamble_word1 & 0xff000000) >> 24;
 948
 949         shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
 950         adapter = (struct zfcp_adapter *) shost->hostdata[0];
 951
 952         switch (gs_type) {
 953         case FC_FST_ALIAS:
 954                 return &adapter->gs->as;
 955         case FC_FST_MGMT:
 956                 return &adapter->gs->ms;
 957         case FC_FST_TIME:
 958                 return &adapter->gs->ts;
 959                 break;
 960         case FC_FST_DIR:
 961                 return &adapter->gs->ds;
 962                 break;
 963         default:
 964                 return NULL;
 965         }
 966 }
 967
 968 static void zfcp_fc_ct_job_handler(void *data)
 969 {
 970         struct bsg_job *job = data;
 971         struct zfcp_fc_wka_port *wka_port;
 972
 973         wka_port = zfcp_fc_job_wka_port(job);
 974         zfcp_fc_wka_port_put(wka_port);
 975
 976         zfcp_fc_ct_els_job_handler(data);
 977 }
 978
 979 static int zfcp_fc_exec_els_job(struct bsg_job *job,
 980                                 struct zfcp_adapter *adapter)
 981 {
 982         struct zfcp_fsf_ct_els *els = job->dd_data;
 983         struct fc_rport *rport = fc_bsg_to_rport(job);
 984         struct fc_bsg_request *bsg_request = job->request;
 985         struct zfcp_port *port;
 986         u32 d_id;
 987
 988         if (rport) {
 989                 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 990                 if (!port)
 991                         return -EINVAL;
 992
 993                 d_id = port->d_id;
 994                 put_device(&port->dev);
 995         } else
 996                 d_id = ntoh24(bsg_request->rqst_data.h_els.port_id);
 997
 998         els->handler = zfcp_fc_ct_els_job_handler;
 999         return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ);
1000 }
1001
1002 static int zfcp_fc_exec_ct_job(struct bsg_job *job,
1003                                struct zfcp_adapter *adapter)
1004 {
1005         int ret;
1006         struct zfcp_fsf_ct_els *ct = job->dd_data;
1007         struct zfcp_fc_wka_port *wka_port;
1008
1009         wka_port = zfcp_fc_job_wka_port(job);
1010         if (!wka_port)
1011                 return -EINVAL;
1012
1013         ret = zfcp_fc_wka_port_get(wka_port);
1014         if (ret)
1015                 return ret;
1016
1017         ct->handler = zfcp_fc_ct_job_handler;
1018         ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ);
1019         if (ret)
1020                 zfcp_fc_wka_port_put(wka_port);
1021
1022         return ret;
1023 }
1024
1025 int zfcp_fc_exec_bsg_job(struct bsg_job *job)
1026 {
1027         struct Scsi_Host *shost;
1028         struct zfcp_adapter *adapter;
1029         struct zfcp_fsf_ct_els *ct_els = job->dd_data;
1030         struct fc_bsg_request *bsg_request = job->request;
1031         struct fc_rport *rport = fc_bsg_to_rport(job);
1032
1033         shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
1034         adapter = (struct zfcp_adapter *)shost->hostdata[0];
1035
1036         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
1037                 return -EINVAL;
1038
1039         ct_els->req = job->request_payload.sg_list;
1040         ct_els->resp = job->reply_payload.sg_list;
1041         ct_els->handler_data = job;
1042
1043         switch (bsg_request->msgcode) {
1044         case FC_BSG_RPT_ELS:
1045         case FC_BSG_HST_ELS_NOLOGIN:
1046                 return zfcp_fc_exec_els_job(job, adapter);
1047         case FC_BSG_RPT_CT:
1048         case FC_BSG_HST_CT:
1049                 return zfcp_fc_exec_ct_job(job, adapter);
1050         default:
1051                 return -EINVAL;
1052         }
1053 }
1054
1055 int zfcp_fc_timeout_bsg_job(struct bsg_job *job)
1056 {
1057         /* hardware tracks timeout, reset bsg timeout to not interfere */
1058         return -EAGAIN;
1059 }
1060
1061 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
1062 {
1063         struct zfcp_fc_wka_ports *wka_ports;
1064
1065         wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL);
1066         if (!wka_ports)
1067                 return -ENOMEM;
1068
1069         adapter->gs = wka_ports;
1070         zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);
1071         zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);
1072         zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);
1073         zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);
1074
1075         return 0;
1076 }
1077
1078 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)
1079 {
1080         kfree(adapter->gs);
1081         adapter->gs = NULL;
1082 }
1083