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