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 <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 static bool no_auto_port_rescan;
  30 module_param_named(no_auto_port_rescan, no_auto_port_rescan, bool, 0600);
  31 MODULE_PARM_DESC(no_auto_port_rescan,
  32                  "no automatic port_rescan (default off)");
  33
  34 void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter)
  35 {
  36         if (no_auto_port_rescan)
  37                 return;
  38
  39         queue_work(adapter->work_queue, &adapter->scan_work);
  40 }
  41
  42 void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter)
  43 {
  44         if (!no_auto_port_rescan)
  45                 return;
  46
  47         queue_work(adapter->work_queue, &adapter->scan_work);
  48 }
  49
  50 /**
  51  * zfcp_fc_post_event - post event to userspace via fc_transport
  52  * @work: work struct with enqueued events
  53  */
  54 void zfcp_fc_post_event(struct work_struct *work)
  55 {
  56         struct zfcp_fc_event *event = NULL, *tmp = NULL;
  57         LIST_HEAD(tmp_lh);
  58         struct zfcp_fc_events *events = container_of(work,
  59                                         struct zfcp_fc_events, work);
  60         struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter,
  61                                                 events);
  62
  63         spin_lock_bh(&events->list_lock);
  64         list_splice_init(&events->list, &tmp_lh);
  65         spin_unlock_bh(&events->list_lock);
  66
  67         list_for_each_entry_safe(event, tmp, &tmp_lh, list) {
  68                 fc_host_post_event(adapter->scsi_host, fc_get_event_number(),
  69                                 event->code, event->data);
  70                 list_del(&event->list);
  71                 kfree(event);
  72         }
  73
  74 }
  75
  76 /**
  77  * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context
  78  * @adapter: The adapter where to enqueue the event
  79  * @event_code: The event code (as defined in fc_host_event_code in
  80  *              scsi_transport_fc.h)
  81  * @event_data: The event data (e.g. n_port page in case of els)
  82  */
  83 void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter,
  84                         enum fc_host_event_code event_code, u32 event_data)
  85 {
  86         struct zfcp_fc_event *event;
  87
  88         event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC);
  89         if (!event)
  90                 return;
  91
  92         event->code = event_code;
  93         event->data = event_data;
  94
  95         spin_lock(&adapter->events.list_lock);
  96         list_add_tail(&event->list, &adapter->events.list);
  97         spin_unlock(&adapter->events.list_lock);
  98
  99         queue_work(adapter->work_queue, &adapter->events.work);
 100 }
 101
 102 static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port)
 103 {
 104         if (mutex_lock_interruptible(&wka_port->mutex))
 105                 return -ERESTARTSYS;
 106
 107         if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE ||
 108             wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) {
 109                 wka_port->status = ZFCP_FC_WKA_PORT_OPENING;
 110                 if (zfcp_fsf_open_wka_port(wka_port))
 111                         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 112         }
 113
 114         mutex_unlock(&wka_port->mutex);
 115
 116         wait_event(wka_port->completion_wq,
 117                    wka_port->status == ZFCP_FC_WKA_PORT_ONLINE ||
 118                    wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
 119
 120         if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) {
 121                 atomic_inc(&wka_port->refcount);
 122                 return 0;
 123         }
 124         return -EIO;
 125 }
 126
 127 static void zfcp_fc_wka_port_offline(struct work_struct *work)
 128 {
 129         struct delayed_work *dw = to_delayed_work(work);
 130         struct zfcp_fc_wka_port *wka_port =
 131                         container_of(dw, struct zfcp_fc_wka_port, work);
 132
 133         mutex_lock(&wka_port->mutex);
 134         if ((atomic_read(&wka_port->refcount) != 0) ||
 135             (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE))
 136                 goto out;
 137
 138         wka_port->status = ZFCP_FC_WKA_PORT_CLOSING;
 139         if (zfcp_fsf_close_wka_port(wka_port)) {
 140                 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 141                 wake_up(&wka_port->completion_wq);
 142         }
 143 out:
 144         mutex_unlock(&wka_port->mutex);
 145 }
 146
 147 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port)
 148 {
 149         if (atomic_dec_return(&wka_port->refcount) != 0)
 150                 return;
 151         /* wait 10 milliseconds, other reqs might pop in */
 152         schedule_delayed_work(&wka_port->work, HZ / 100);
 153 }
 154
 155 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id,
 156                                   struct zfcp_adapter *adapter)
 157 {
 158         init_waitqueue_head(&wka_port->completion_wq);
 159
 160         wka_port->adapter = adapter;
 161         wka_port->d_id = d_id;
 162
 163         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 164         atomic_set(&wka_port->refcount, 0);
 165         mutex_init(&wka_port->mutex);
 166         INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline);
 167 }
 168
 169 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka)
 170 {
 171         cancel_delayed_work_sync(&wka->work);
 172         mutex_lock(&wka->mutex);
 173         wka->status = ZFCP_FC_WKA_PORT_OFFLINE;
 174         mutex_unlock(&wka->mutex);
 175 }
 176
 177 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs)
 178 {
 179         if (!gs)
 180                 return;
 181         zfcp_fc_wka_port_force_offline(&gs->ms);
 182         zfcp_fc_wka_port_force_offline(&gs->ts);
 183         zfcp_fc_wka_port_force_offline(&gs->ds);
 184         zfcp_fc_wka_port_force_offline(&gs->as);
 185 }
 186
 187 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
 188                                    struct fc_els_rscn_page *page)
 189 {
 190         unsigned long flags;
 191         struct zfcp_adapter *adapter = fsf_req->adapter;
 192         struct zfcp_port *port;
 193
 194         read_lock_irqsave(&adapter->port_list_lock, flags);
 195         list_for_each_entry(port, &adapter->port_list, list) {
 196                 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range))
 197                         zfcp_fc_test_link(port);
 198                 if (!port->d_id)
 199                         zfcp_erp_port_reopen(port,
 200                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 201                                              "fcrscn1");
 202         }
 203         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 204 }
 205
 206 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 207 {
 208         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 209         struct fc_els_rscn *head;
 210         struct fc_els_rscn_page *page;
 211         u16 i;
 212         u16 no_entries;
 213         unsigned int afmt;
 214
 215         head = (struct fc_els_rscn *) status_buffer->payload.data;
 216         page = (struct fc_els_rscn_page *) head;
 217
 218         /* see FC-FS */
 219         no_entries = head->rscn_plen / sizeof(struct fc_els_rscn_page);
 220
 221         for (i = 1; i < no_entries; i++) {
 222                 /* skip head and start with 1st element */
 223                 page++;
 224                 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
 225                 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
 226                                        page);
 227                 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,
 228                                       *(u32 *)page);
 229         }
 230         zfcp_fc_conditional_port_scan(fsf_req->adapter);
 231 }
 232
 233 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 234 {
 235         unsigned long flags;
 236         struct zfcp_adapter *adapter = req->adapter;
 237         struct zfcp_port *port;
 238
 239         read_lock_irqsave(&adapter->port_list_lock, flags);
 240         list_for_each_entry(port, &adapter->port_list, list)
 241                 if (port->wwpn == wwpn) {
 242                         zfcp_erp_port_forced_reopen(port, 0, "fciwwp1");
 243                         break;
 244                 }
 245         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 246 }
 247
 248 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 249 {
 250         struct fsf_status_read_buffer *status_buffer;
 251         struct fc_els_flogi *plogi;
 252
 253         status_buffer = (struct fsf_status_read_buffer *) req->data;
 254         plogi = (struct fc_els_flogi *) status_buffer->payload.data;
 255         zfcp_fc_incoming_wwpn(req, plogi->fl_wwpn);
 256 }
 257
 258 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 259 {
 260         struct fsf_status_read_buffer *status_buffer =
 261                 (struct fsf_status_read_buffer *)req->data;
 262         struct fc_els_logo *logo =
 263                 (struct fc_els_logo *) status_buffer->payload.data;
 264
 265         zfcp_fc_incoming_wwpn(req, logo->fl_n_port_wwn);
 266 }
 267
 268 /**
 269  * zfcp_fc_incoming_els - handle incoming ELS
 270  * @fsf_req - request which contains incoming ELS
 271  */
 272 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 273 {
 274         struct fsf_status_read_buffer *status_buffer =
 275                 (struct fsf_status_read_buffer *) fsf_req->data;
 276         unsigned int els_type = status_buffer->payload.data[0];
 277
 278         zfcp_dbf_san_in_els("fciels1", fsf_req);
 279         if (els_type == ELS_PLOGI)
 280                 zfcp_fc_incoming_plogi(fsf_req);
 281         else if (els_type == ELS_LOGO)
 282                 zfcp_fc_incoming_logo(fsf_req);
 283         else if (els_type == ELS_RSCN)
 284                 zfcp_fc_incoming_rscn(fsf_req);
 285 }
 286
 287 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req)
 288 {
 289         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 290         struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 291
 292         if (ct_els->status)
 293                 return;
 294         if (gid_pn_rsp->ct_hdr.ct_cmd != FC_FS_ACC)
 295                 return;
 296
 297         /* looks like a valid d_id */
 298         ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid);
 299 }
 300
 301 static void zfcp_fc_complete(void *data)
 302 {
 303         complete(data);
 304 }
 305
 306 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size)
 307 {
 308         ct_hdr->ct_rev = FC_CT_REV;
 309         ct_hdr->ct_fs_type = FC_FST_DIR;
 310         ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE;
 311         ct_hdr->ct_cmd = cmd;
 312         ct_hdr->ct_mr_size = mr_size / 4;
 313 }
 314
 315 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
 316                                      struct zfcp_fc_req *fc_req)
 317 {
 318         struct zfcp_adapter *adapter = port->adapter;
 319         DECLARE_COMPLETION_ONSTACK(completion);
 320         struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req;
 321         struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 322         int ret;
 323
 324         /* setup parameters for send generic command */
 325         fc_req->ct_els.port = port;
 326         fc_req->ct_els.handler = zfcp_fc_complete;
 327         fc_req->ct_els.handler_data = &completion;
 328         fc_req->ct_els.req = &fc_req->sg_req;
 329         fc_req->ct_els.resp = &fc_req->sg_rsp;
 330         sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req));
 331         sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp));
 332
 333         zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr,
 334                            FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE);
 335         gid_pn_req->gid_pn.fn_wwpn = port->wwpn;
 336
 337         ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els,
 338                                adapter->pool.gid_pn_req,
 339                                ZFCP_FC_CTELS_TMO);
 340         if (!ret) {
 341                 wait_for_completion(&completion);
 342                 zfcp_fc_ns_gid_pn_eval(fc_req);
 343         }
 344         return ret;
 345 }
 346
 347 /**
 348  * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request
 349  * @port: port where GID_PN request is needed
 350  * return: -ENOMEM on error, 0 otherwise
 351  */
 352 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
 353 {
 354         int ret;
 355         struct zfcp_fc_req *fc_req;
 356         struct zfcp_adapter *adapter = port->adapter;
 357
 358         fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC);
 359         if (!fc_req)
 360                 return -ENOMEM;
 361
 362         memset(fc_req, 0, sizeof(*fc_req));
 363
 364         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 365         if (ret)
 366                 goto out;
 367
 368         ret = zfcp_fc_ns_gid_pn_request(port, fc_req);
 369
 370         zfcp_fc_wka_port_put(&adapter->gs->ds);
 371 out:
 372         mempool_free(fc_req, adapter->pool.gid_pn);
 373         return ret;
 374 }
 375
 376 void zfcp_fc_port_did_lookup(struct work_struct *work)
 377 {
 378         int ret;
 379         struct zfcp_port *port = container_of(work, struct zfcp_port,
 380                                               gid_pn_work);
 381
 382         ret = zfcp_fc_ns_gid_pn(port);
 383         if (ret) {
 384                 /* could not issue gid_pn for some reason */
 385                 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1");
 386                 goto out;
 387         }
 388
 389         if (!port->d_id) {
 390                 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
 391                 goto out;
 392         }
 393
 394         zfcp_erp_port_reopen(port, 0, "fcgpn_3");
 395 out:
 396         put_device(&port->dev);
 397 }
 398
 399 /**
 400  * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request
 401  * @port: The zfcp_port to lookup the d_id for.
 402  */
 403 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)
 404 {
 405         get_device(&port->dev);
 406         if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))
 407                 put_device(&port->dev);
 408 }
 409
 410 /**
 411  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 412  * @port: zfcp_port structure
 413  * @plogi: plogi payload
 414  *
 415  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 416  */
 417 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi)
 418 {
 419         if (plogi->fl_wwpn != port->wwpn) {
 420                 port->d_id = 0;
 421                 dev_warn(&port->adapter->ccw_device->dev,
 422                          "A port opened with WWPN 0x%016Lx returned data that "
 423                          "identifies it as WWPN 0x%016Lx\n",
 424                          (unsigned long long) port->wwpn,
 425                          (unsigned long long) plogi->fl_wwpn);
 426                 return;
 427         }
 428
 429         port->wwnn = plogi->fl_wwnn;
 430         port->maxframe_size = plogi->fl_csp.sp_bb_data;
 431
 432         if (plogi->fl_cssp[0].cp_class & FC_CPC_VALID)
 433                 port->supported_classes |= FC_COS_CLASS1;
 434         if (plogi->fl_cssp[1].cp_class & FC_CPC_VALID)
 435                 port->supported_classes |= FC_COS_CLASS2;
 436         if (plogi->fl_cssp[2].cp_class & FC_CPC_VALID)
 437                 port->supported_classes |= FC_COS_CLASS3;
 438         if (plogi->fl_cssp[3].cp_class & FC_CPC_VALID)
 439                 port->supported_classes |= FC_COS_CLASS4;
 440 }
 441
 442 static void zfcp_fc_adisc_handler(void *data)
 443 {
 444         struct zfcp_fc_req *fc_req = data;
 445         struct zfcp_port *port = fc_req->ct_els.port;
 446         struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp;
 447
 448         if (fc_req->ct_els.status) {
 449                 /* request rejected or timed out */
 450                 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 451                                             "fcadh_1");
 452                 goto out;
 453         }
 454
 455         if (!port->wwnn)
 456                 port->wwnn = adisc_resp->adisc_wwnn;
 457
 458         if ((port->wwpn != adisc_resp->adisc_wwpn) ||
 459             !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 460                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 461                                      "fcadh_2");
 462                 goto out;
 463         }
 464
 465         /* port is good, unblock rport without going through erp */
 466         zfcp_scsi_schedule_rport_register(port);
 467  out:
 468         atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 469         put_device(&port->dev);
 470         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 471 }
 472
 473 static int zfcp_fc_adisc(struct zfcp_port *port)
 474 {
 475         struct zfcp_fc_req *fc_req;
 476         struct zfcp_adapter *adapter = port->adapter;
 477         struct Scsi_Host *shost = adapter->scsi_host;
 478         int ret;
 479
 480         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC);
 481         if (!fc_req)
 482                 return -ENOMEM;
 483
 484         fc_req->ct_els.port = port;
 485         fc_req->ct_els.req = &fc_req->sg_req;
 486         fc_req->ct_els.resp = &fc_req->sg_rsp;
 487         sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req,
 488                     sizeof(struct fc_els_adisc));
 489         sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp,
 490                     sizeof(struct fc_els_adisc));
 491
 492         fc_req->ct_els.handler = zfcp_fc_adisc_handler;
 493         fc_req->ct_els.handler_data = fc_req;
 494
 495         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 496            without FC-AL-2 capability, so we don't set it */
 497         fc_req->u.adisc.req.adisc_wwpn = fc_host_port_name(shost);
 498         fc_req->u.adisc.req.adisc_wwnn = fc_host_node_name(shost);
 499         fc_req->u.adisc.req.adisc_cmd = ELS_ADISC;
 500         hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost));
 501
 502         ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els,
 503                                 ZFCP_FC_CTELS_TMO);
 504         if (ret)
 505                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 506
 507         return ret;
 508 }
 509
 510 void zfcp_fc_link_test_work(struct work_struct *work)
 511 {
 512         struct zfcp_port *port =
 513                 container_of(work, struct zfcp_port, test_link_work);
 514         int retval;
 515
 516         get_device(&port->dev);
 517         port->rport_task = RPORT_DEL;
 518         zfcp_scsi_rport_work(&port->rport_work);
 519
 520         /* only issue one test command at one time per port */
 521         if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
 522                 goto out;
 523
 524         atomic_set_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 525
 526         retval = zfcp_fc_adisc(port);
 527         if (retval == 0)
 528                 return;
 529
 530         /* send of ADISC was not possible */
 531         atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 532         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1");
 533
 534 out:
 535         put_device(&port->dev);
 536 }
 537
 538 /**
 539  * zfcp_fc_test_link - lightweight link test procedure
 540  * @port: port to be tested
 541  *
 542  * Test status of a link to a remote port using the ELS command ADISC.
 543  * If there is a problem with the remote port, error recovery steps
 544  * will be triggered.
 545  */
 546 void zfcp_fc_test_link(struct zfcp_port *port)
 547 {
 548         get_device(&port->dev);
 549         if (!queue_work(port->adapter->work_queue, &port->test_link_work))
 550                 put_device(&port->dev);
 551 }
 552
 553 static struct zfcp_fc_req *zfcp_alloc_sg_env(int buf_num)
 554 {
 555         struct zfcp_fc_req *fc_req;
 556
 557         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 558         if (!fc_req)
 559                 return NULL;
 560
 561         if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) {
 562                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 563                 return NULL;
 564         }
 565
 566         sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req,
 567                     sizeof(struct zfcp_fc_gpn_ft_req));
 568
 569         return fc_req;
 570 }
 571
 572 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req,
 573                                struct zfcp_adapter *adapter, int max_bytes)
 574 {
 575         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 576         struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req;
 577         DECLARE_COMPLETION_ONSTACK(completion);
 578         int ret;
 579
 580         zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes);
 581         req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;
 582
 583         ct_els->handler = zfcp_fc_complete;
 584         ct_els->handler_data = &completion;
 585         ct_els->req = &fc_req->sg_req;
 586         ct_els->resp = &fc_req->sg_rsp;
 587
 588         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 589                                ZFCP_FC_CTELS_TMO);
 590         if (!ret)
 591                 wait_for_completion(&completion);
 592         return ret;
 593 }
 594
 595 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
 596 {
 597         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 598                 return;
 599
 600         atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
 601
 602         if ((port->supported_classes != 0) ||
 603             !list_empty(&port->unit_list))
 604                 return;
 605
 606         list_move_tail(&port->list, lh);
 607 }
 608
 609 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,
 610                                struct zfcp_adapter *adapter, int max_entries)
 611 {
 612         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 613         struct scatterlist *sg = &fc_req->sg_rsp;
 614         struct fc_ct_hdr *hdr = sg_virt(sg);
 615         struct fc_gpn_ft_resp *acc = sg_virt(sg);
 616         struct zfcp_port *port, *tmp;
 617         unsigned long flags;
 618         LIST_HEAD(remove_lh);
 619         u32 d_id;
 620         int ret = 0, x, last = 0;
 621
 622         if (ct_els->status)
 623                 return -EIO;
 624
 625         if (hdr->ct_cmd != FC_FS_ACC) {
 626                 if (hdr->ct_reason == FC_BA_RJT_UNABLE)
 627                         return -EAGAIN; /* might be a temporary condition */
 628                 return -EIO;
 629         }
 630
 631         if (hdr->ct_mr_size) {
 632                 dev_warn(&adapter->ccw_device->dev,
 633                          "The name server reported %d words residual data\n",
 634                          hdr->ct_mr_size);
 635                 return -E2BIG;
 636         }
 637
 638         /* first entry is the header */
 639         for (x = 1; x < max_entries && !last; x++) {
 640                 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
 641                         acc++;
 642                 else
 643                         acc = sg_virt(++sg);
 644
 645                 last = acc->fp_flags & FC_NS_FID_LAST;
 646                 d_id = ntoh24(acc->fp_fid);
 647
 648                 /* don't attach ports with a well known address */
 649                 if (d_id >= FC_FID_WELL_KNOWN_BASE)
 650                         continue;
 651                 /* skip the adapter's port and known remote ports */
 652                 if (acc->fp_wwpn == fc_host_port_name(adapter->scsi_host))
 653                         continue;
 654
 655                 port = zfcp_port_enqueue(adapter, acc->fp_wwpn,
 656                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 657                 if (!IS_ERR(port))
 658                         zfcp_erp_port_reopen(port, 0, "fcegpf1");
 659                 else if (PTR_ERR(port) != -EEXIST)
 660                         ret = PTR_ERR(port);
 661         }
 662
 663         zfcp_erp_wait(adapter);
 664         write_lock_irqsave(&adapter->port_list_lock, flags);
 665         list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
 666                 zfcp_fc_validate_port(port, &remove_lh);
 667         write_unlock_irqrestore(&adapter->port_list_lock, flags);
 668
 669         list_for_each_entry_safe(port, tmp, &remove_lh, list) {
 670                 zfcp_erp_port_shutdown(port, 0, "fcegpf2");
 671                 device_unregister(&port->dev);
 672         }
 673
 674         return ret;
 675 }
 676
 677 /**
 678  * zfcp_fc_scan_ports - scan remote ports and attach new ports
 679  * @work: reference to scheduled work
 680  */
 681 void zfcp_fc_scan_ports(struct work_struct *work)
 682 {
 683         struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
 684                                                     scan_work);
 685         int ret, i;
 686         struct zfcp_fc_req *fc_req;
 687         int chain, max_entries, buf_num, max_bytes;
 688
 689         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 690         buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1;
 691         max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE;
 692         max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE;
 693
 694         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 695             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 696                 return;
 697
 698         if (zfcp_fc_wka_port_get(&adapter->gs->ds))
 699                 return;
 700
 701         fc_req = zfcp_alloc_sg_env(buf_num);
 702         if (!fc_req)
 703                 goto out;
 704
 705         for (i = 0; i < 3; i++) {
 706                 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes);
 707                 if (!ret) {
 708                         ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries);
 709                         if (ret == -EAGAIN)
 710                                 ssleep(1);
 711                         else
 712                                 break;
 713                 }
 714         }
 715         zfcp_sg_free_table(&fc_req->sg_rsp, buf_num);
 716         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 717 out:
 718         zfcp_fc_wka_port_put(&adapter->gs->ds);
 719 }
 720
 721 static int zfcp_fc_gspn(struct zfcp_adapter *adapter,
 722                         struct zfcp_fc_req *fc_req)
 723 {
 724         DECLARE_COMPLETION_ONSTACK(completion);
 725         char devno[] = "DEVNO:";
 726         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 727         struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req;
 728         struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp;
 729         int ret;
 730
 731         zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID,
 732                            FC_SYMBOLIC_NAME_SIZE);
 733         hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host));
 734
 735         sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req));
 736         sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp));
 737
 738         ct_els->handler = zfcp_fc_complete;
 739         ct_els->handler_data = &completion;
 740         ct_els->req = &fc_req->sg_req;
 741         ct_els->resp = &fc_req->sg_rsp;
 742
 743         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 744                                ZFCP_FC_CTELS_TMO);
 745         if (ret)
 746                 return ret;
 747
 748         wait_for_completion(&completion);
 749         if (ct_els->status)
 750                 return ct_els->status;
 751
 752         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV &&
 753             !(strstr(gspn_rsp->gspn.fp_name, devno)))
 754                 snprintf(fc_host_symbolic_name(adapter->scsi_host),
 755                          FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s",
 756                          gspn_rsp->gspn.fp_name, devno,
 757                          dev_name(&adapter->ccw_device->dev),
 758                          init_utsname()->nodename);
 759         else
 760                 strlcpy(fc_host_symbolic_name(adapter->scsi_host),
 761                         gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE);
 762
 763         return 0;
 764 }
 765
 766 static void zfcp_fc_rspn(struct zfcp_adapter *adapter,
 767                          struct zfcp_fc_req *fc_req)
 768 {
 769         DECLARE_COMPLETION_ONSTACK(completion);
 770         struct Scsi_Host *shost = adapter->scsi_host;
 771         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 772         struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req;
 773         struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp;
 774         int ret, len;
 775
 776         zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID,
 777                            FC_SYMBOLIC_NAME_SIZE);
 778         hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost));
 779         len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost),
 780                       FC_SYMBOLIC_NAME_SIZE);
 781         rspn_req->rspn.fr_name_len = len;
 782
 783         sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req));
 784         sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp));
 785
 786         ct_els->handler = zfcp_fc_complete;
 787         ct_els->handler_data = &completion;
 788         ct_els->req = &fc_req->sg_req;
 789         ct_els->resp = &fc_req->sg_rsp;
 790
 791         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 792                                ZFCP_FC_CTELS_TMO);
 793         if (!ret)
 794                 wait_for_completion(&completion);
 795 }
 796
 797 /**
 798  * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name
 799  * @work: ns_up_work of the adapter where to update the symbolic port name
 800  *
 801  * Retrieve the current symbolic port name that may have been set by
 802  * the hardware using the GSPN request and update the fc_host
 803  * symbolic_name sysfs attribute. When running in NPIV mode (and hence
 804  * the port name is unique for this system), update the symbolic port
 805  * name to add Linux specific information and update the FC nameserver
 806  * using the RSPN request.
 807  */
 808 void zfcp_fc_sym_name_update(struct work_struct *work)
 809 {
 810         struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
 811                                                     ns_up_work);
 812         int ret;
 813         struct zfcp_fc_req *fc_req;
 814
 815         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 816             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 817                 return;
 818
 819         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 820         if (!fc_req)
 821                 return;
 822
 823         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 824         if (ret)
 825                 goto out_free;
 826
 827         ret = zfcp_fc_gspn(adapter, fc_req);
 828         if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 829                 goto out_ds_put;
 830
 831         memset(fc_req, 0, sizeof(*fc_req));
 832         zfcp_fc_rspn(adapter, fc_req);
 833
 834 out_ds_put:
 835         zfcp_fc_wka_port_put(&adapter->gs->ds);
 836 out_free:
 837         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 838 }
 839
 840 static void zfcp_fc_ct_els_job_handler(void *data)
 841 {
 842         struct fc_bsg_job *job = data;
 843         struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data;
 844         struct fc_bsg_reply *jr = job->reply;
 845
 846         jr->reply_payload_rcv_len = job->reply_payload.payload_len;
 847         jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
 848         jr->result = zfcp_ct_els->status ? -EIO : 0;
 849         job->job_done(job);
 850 }
 851
 852 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct fc_bsg_job *job)
 853 {
 854         u32 preamble_word1;
 855         u8 gs_type;
 856         struct zfcp_adapter *adapter;
 857
 858         preamble_word1 = job->request->rqst_data.r_ct.preamble_word1;
 859         gs_type = (preamble_word1 & 0xff000000) >> 24;
 860
 861         adapter = (struct zfcp_adapter *) job->shost->hostdata[0];
 862
 863         switch (gs_type) {
 864         case FC_FST_ALIAS:
 865                 return &adapter->gs->as;
 866         case FC_FST_MGMT:
 867                 return &adapter->gs->ms;
 868         case FC_FST_TIME:
 869                 return &adapter->gs->ts;
 870                 break;
 871         case FC_FST_DIR:
 872                 return &adapter->gs->ds;
 873                 break;
 874         default:
 875                 return NULL;
 876         }
 877 }
 878
 879 static void zfcp_fc_ct_job_handler(void *data)
 880 {
 881         struct fc_bsg_job *job = data;
 882         struct zfcp_fc_wka_port *wka_port;
 883
 884         wka_port = zfcp_fc_job_wka_port(job);
 885         zfcp_fc_wka_port_put(wka_port);
 886
 887         zfcp_fc_ct_els_job_handler(data);
 888 }
 889
 890 static int zfcp_fc_exec_els_job(struct fc_bsg_job *job,
 891                                 struct zfcp_adapter *adapter)
 892 {
 893         struct zfcp_fsf_ct_els *els = job->dd_data;
 894         struct fc_rport *rport = job->rport;
 895         struct zfcp_port *port;
 896         u32 d_id;
 897
 898         if (rport) {
 899                 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 900                 if (!port)
 901                         return -EINVAL;
 902
 903                 d_id = port->d_id;
 904                 put_device(&port->dev);
 905         } else
 906                 d_id = ntoh24(job->request->rqst_data.h_els.port_id);
 907
 908         els->handler = zfcp_fc_ct_els_job_handler;
 909         return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ);
 910 }
 911
 912 static int zfcp_fc_exec_ct_job(struct fc_bsg_job *job,
 913                                struct zfcp_adapter *adapter)
 914 {
 915         int ret;
 916         struct zfcp_fsf_ct_els *ct = job->dd_data;
 917         struct zfcp_fc_wka_port *wka_port;
 918
 919         wka_port = zfcp_fc_job_wka_port(job);
 920         if (!wka_port)
 921                 return -EINVAL;
 922
 923         ret = zfcp_fc_wka_port_get(wka_port);
 924         if (ret)
 925                 return ret;
 926
 927         ct->handler = zfcp_fc_ct_job_handler;
 928         ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ);
 929         if (ret)
 930                 zfcp_fc_wka_port_put(wka_port);
 931
 932         return ret;
 933 }
 934
 935 int zfcp_fc_exec_bsg_job(struct fc_bsg_job *job)
 936 {
 937         struct Scsi_Host *shost;
 938         struct zfcp_adapter *adapter;
 939         struct zfcp_fsf_ct_els *ct_els = job->dd_data;
 940
 941         shost = job->rport ? rport_to_shost(job->rport) : job->shost;
 942         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 943
 944         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
 945                 return -EINVAL;
 946
 947         ct_els->req = job->request_payload.sg_list;
 948         ct_els->resp = job->reply_payload.sg_list;
 949         ct_els->handler_data = job;
 950
 951         switch (job->request->msgcode) {
 952         case FC_BSG_RPT_ELS:
 953         case FC_BSG_HST_ELS_NOLOGIN:
 954                 return zfcp_fc_exec_els_job(job, adapter);
 955         case FC_BSG_RPT_CT:
 956         case FC_BSG_HST_CT:
 957                 return zfcp_fc_exec_ct_job(job, adapter);
 958         default:
 959                 return -EINVAL;
 960         }
 961 }
 962
 963 int zfcp_fc_timeout_bsg_job(struct fc_bsg_job *job)
 964 {
 965         /* hardware tracks timeout, reset bsg timeout to not interfere */
 966         return -EAGAIN;
 967 }
 968
 969 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
 970 {
 971         struct zfcp_fc_wka_ports *wka_ports;
 972
 973         wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL);
 974         if (!wka_ports)
 975                 return -ENOMEM;
 976
 977         adapter->gs = wka_ports;
 978         zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);
 979         zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);
 980         zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);
 981         zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);
 982
 983         return 0;
 984 }
 985
 986 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)
 987 {
 988         kfree(adapter->gs);
 989         adapter->gs = NULL;
 990 }
 991