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