git.oblomov.eu Git - linux-2.6/blob - 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
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include "zfcp_ext.h"
  13
  14 enum rscn_address_format {
  15         RSCN_PORT_ADDRESS       = 0x0,
  16         RSCN_AREA_ADDRESS       = 0x1,
  17         RSCN_DOMAIN_ADDRESS     = 0x2,
  18         RSCN_FABRIC_ADDRESS     = 0x3,
  19 };
  20
  21 static u32 rscn_range_mask[] = {
  22         [RSCN_PORT_ADDRESS]             = 0xFFFFFF,
  23         [RSCN_AREA_ADDRESS]             = 0xFFFF00,
  24         [RSCN_DOMAIN_ADDRESS]           = 0xFF0000,
  25         [RSCN_FABRIC_ADDRESS]           = 0x000000,
  26 };
  27
  28 struct ct_iu_gpn_ft_req {
  29         struct ct_hdr header;
  30         u8 flags;
  31         u8 domain_id_scope;
  32         u8 area_id_scope;
  33         u8 fc4_type;
  34 } __attribute__ ((packed));
  35
  36 struct gpn_ft_resp_acc {
  37         u8 control;
  38         u8 port_id[3];
  39         u8 reserved[4];
  40         u64 wwpn;
  41 } __attribute__ ((packed));
  42
  43 #define ZFCP_CT_SIZE_ONE_PAGE   (PAGE_SIZE - sizeof(struct ct_hdr))
  44 #define ZFCP_GPN_FT_ENTRIES     (ZFCP_CT_SIZE_ONE_PAGE \
  45                                         / sizeof(struct gpn_ft_resp_acc))
  46 #define ZFCP_GPN_FT_BUFFERS 4
  47 #define ZFCP_GPN_FT_MAX_SIZE (ZFCP_GPN_FT_BUFFERS * PAGE_SIZE \
  48                                 - sizeof(struct ct_hdr))
  49 #define ZFCP_GPN_FT_MAX_ENTRIES ZFCP_GPN_FT_BUFFERS * (ZFCP_GPN_FT_ENTRIES + 1)
  50
  51 struct ct_iu_gpn_ft_resp {
  52         struct ct_hdr header;
  53         struct gpn_ft_resp_acc accept[ZFCP_GPN_FT_ENTRIES];
  54 } __attribute__ ((packed));
  55
  56 struct zfcp_gpn_ft {
  57         struct zfcp_send_ct ct;
  58         struct scatterlist sg_req;
  59         struct scatterlist sg_resp[ZFCP_GPN_FT_BUFFERS];
  60 };
  61
  62 struct zfcp_fc_ns_handler_data {
  63         struct completion done;
  64         void (*handler)(unsigned long);
  65         unsigned long handler_data;
  66 };
  67
  68 static int zfcp_wka_port_get(struct zfcp_wka_port *wka_port)
  69 {
  70         if (mutex_lock_interruptible(&wka_port->mutex))
  71                 return -ERESTARTSYS;
  72
  73         if (wka_port->status == ZFCP_WKA_PORT_OFFLINE ||
  74             wka_port->status == ZFCP_WKA_PORT_CLOSING) {
  75                 wka_port->status = ZFCP_WKA_PORT_OPENING;
  76                 if (zfcp_fsf_open_wka_port(wka_port))
  77                         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
  78         }
  79
  80         mutex_unlock(&wka_port->mutex);
  81
  82         wait_event_timeout(
  83                 wka_port->completion_wq,
  84                 wka_port->status == ZFCP_WKA_PORT_ONLINE ||
  85                 wka_port->status == ZFCP_WKA_PORT_OFFLINE,
  86                 HZ >> 1);
  87
  88         if (wka_port->status == ZFCP_WKA_PORT_ONLINE) {
  89                 atomic_inc(&wka_port->refcount);
  90                 return 0;
  91         }
  92         return -EIO;
  93 }
  94
  95 static void zfcp_wka_port_offline(struct work_struct *work)
  96 {
  97         struct delayed_work *dw = container_of(work, struct delayed_work, work);
  98         struct zfcp_wka_port *wka_port =
  99                         container_of(dw, struct zfcp_wka_port, work);
 100
 101         wait_event(wka_port->completion_wq,
 102                         atomic_read(&wka_port->refcount) == 0);
 103
 104         mutex_lock(&wka_port->mutex);
 105         if ((atomic_read(&wka_port->refcount) != 0) ||
 106             (wka_port->status != ZFCP_WKA_PORT_ONLINE))
 107                 goto out;
 108
 109         wka_port->status = ZFCP_WKA_PORT_CLOSING;
 110         if (zfcp_fsf_close_wka_port(wka_port)) {
 111                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
 112                 wake_up(&wka_port->completion_wq);
 113         }
 114 out:
 115         mutex_unlock(&wka_port->mutex);
 116 }
 117
 118 static void zfcp_wka_port_put(struct zfcp_wka_port *wka_port)
 119 {
 120         if (atomic_dec_return(&wka_port->refcount) != 0)
 121                 return;
 122         /* wait 10 miliseconds, other reqs might pop in */
 123         schedule_delayed_work(&wka_port->work, HZ / 100);
 124 }
 125
 126 void zfcp_fc_nameserver_init(struct zfcp_adapter *adapter)
 127 {
 128         struct zfcp_wka_port *wka_port = &adapter->nsp;
 129
 130         init_waitqueue_head(&wka_port->completion_wq);
 131
 132         wka_port->adapter = adapter;
 133         wka_port->d_id = ZFCP_DID_DIRECTORY_SERVICE;
 134
 135         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
 136         atomic_set(&wka_port->refcount, 0);
 137         mutex_init(&wka_port->mutex);
 138         INIT_DELAYED_WORK(&wka_port->work, zfcp_wka_port_offline);
 139 }
 140
 141 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
 142                                    struct fcp_rscn_element *elem)
 143 {
 144         unsigned long flags;
 145         struct zfcp_port *port;
 146
 147         read_lock_irqsave(&zfcp_data.config_lock, flags);
 148         list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
 149                 if (!(atomic_read(&port->status) & ZFCP_STATUS_PORT_PHYS_OPEN))
 150                         /* Try to connect to unused ports anyway. */
 151                         zfcp_erp_port_reopen(port,
 152                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 153                                              82, fsf_req);
 154                 else if ((port->d_id & range) == (elem->nport_did & range))
 155                         /* Check connection status for connected ports */
 156                         zfcp_test_link(port);
 157         }
 158         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 159 }
 160
 161 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 162 {
 163         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 164         struct fcp_rscn_head *fcp_rscn_head;
 165         struct fcp_rscn_element *fcp_rscn_element;
 166         u16 i;
 167         u16 no_entries;
 168         u32 range_mask;
 169
 170         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload.data;
 171         fcp_rscn_element = (struct fcp_rscn_element *) fcp_rscn_head;
 172
 173         /* see FC-FS */
 174         no_entries = fcp_rscn_head->payload_len /
 175                         sizeof(struct fcp_rscn_element);
 176
 177         for (i = 1; i < no_entries; i++) {
 178                 /* skip head and start with 1st element */
 179                 fcp_rscn_element++;
 180                 range_mask = rscn_range_mask[fcp_rscn_element->addr_format];
 181                 _zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
 182         }
 183         schedule_work(&fsf_req->adapter->scan_work);
 184 }
 185
 186 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 187 {
 188         struct zfcp_adapter *adapter = req->adapter;
 189         struct zfcp_port *port;
 190         unsigned long flags;
 191
 192         read_lock_irqsave(&zfcp_data.config_lock, flags);
 193         list_for_each_entry(port, &adapter->port_list_head, list)
 194                 if (port->wwpn == wwpn)
 195                         break;
 196         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 197
 198         if (port && (port->wwpn == wwpn))
 199                 zfcp_erp_port_forced_reopen(port, 0, 83, req);
 200 }
 201
 202 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 203 {
 204         struct fsf_status_read_buffer *status_buffer =
 205                 (struct fsf_status_read_buffer *)req->data;
 206         struct fsf_plogi *els_plogi =
 207                 (struct fsf_plogi *) status_buffer->payload.data;
 208
 209         zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
 210 }
 211
 212 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 213 {
 214         struct fsf_status_read_buffer *status_buffer =
 215                 (struct fsf_status_read_buffer *)req->data;
 216         struct fcp_logo *els_logo =
 217                 (struct fcp_logo *) status_buffer->payload.data;
 218
 219         zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
 220 }
 221
 222 /**
 223  * zfcp_fc_incoming_els - handle incoming ELS
 224  * @fsf_req - request which contains incoming ELS
 225  */
 226 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 227 {
 228         struct fsf_status_read_buffer *status_buffer =
 229                 (struct fsf_status_read_buffer *) fsf_req->data;
 230         unsigned int els_type = status_buffer->payload.data[0];
 231
 232         zfcp_san_dbf_event_incoming_els(fsf_req);
 233         if (els_type == LS_PLOGI)
 234                 zfcp_fc_incoming_plogi(fsf_req);
 235         else if (els_type == LS_LOGO)
 236                 zfcp_fc_incoming_logo(fsf_req);
 237         else if (els_type == LS_RSCN)
 238                 zfcp_fc_incoming_rscn(fsf_req);
 239 }
 240
 241 static void zfcp_fc_ns_handler(unsigned long data)
 242 {
 243         struct zfcp_fc_ns_handler_data *compl_rec =
 244                         (struct zfcp_fc_ns_handler_data *) data;
 245
 246         if (compl_rec->handler)
 247                 compl_rec->handler(compl_rec->handler_data);
 248
 249         complete(&compl_rec->done);
 250 }
 251
 252 static void zfcp_fc_ns_gid_pn_eval(unsigned long data)
 253 {
 254         struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data;
 255         struct zfcp_send_ct *ct = &gid_pn->ct;
 256         struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
 257         struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
 258         struct zfcp_port *port = gid_pn->port;
 259
 260         if (ct->status)
 261                 return;
 262         if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT) {
 263                 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
 264                 return;
 265         }
 266         /* paranoia */
 267         if (ct_iu_req->wwpn != port->wwpn)
 268                 return;
 269         /* looks like a valid d_id */
 270         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
 271 }
 272
 273 int static zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action,
 274                                      struct zfcp_gid_pn_data *gid_pn)
 275 {
 276         struct zfcp_adapter *adapter = erp_action->adapter;
 277         struct zfcp_fc_ns_handler_data compl_rec;
 278         int ret;
 279
 280         /* setup parameters for send generic command */
 281         gid_pn->port = erp_action->port;
 282         gid_pn->ct.wka_port = &adapter->nsp;
 283         gid_pn->ct.handler = zfcp_fc_ns_handler;
 284         gid_pn->ct.handler_data = (unsigned long) &compl_rec;
 285         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
 286         gid_pn->ct.req = &gid_pn->req;
 287         gid_pn->ct.resp = &gid_pn->resp;
 288         sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
 289                     sizeof(struct ct_iu_gid_pn_req));
 290         sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
 291                     sizeof(struct ct_iu_gid_pn_resp));
 292
 293         /* setup nameserver request */
 294         gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
 295         gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 296         gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
 297         gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
 298         gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
 299         gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_SIZE_ONE_PAGE / 4;
 300         gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
 301
 302         init_completion(&compl_rec.done);
 303         compl_rec.handler = zfcp_fc_ns_gid_pn_eval;
 304         compl_rec.handler_data = (unsigned long) gid_pn;
 305         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
 306                                erp_action);
 307         if (!ret)
 308                 wait_for_completion(&compl_rec.done);
 309         return ret;
 310 }
 311
 312 /**
 313  * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
 314  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
 315  * return: -ENOMEM on error, 0 otherwise
 316  */
 317 int zfcp_fc_ns_gid_pn(struct zfcp_erp_action *erp_action)
 318 {
 319         int ret;
 320         struct zfcp_gid_pn_data *gid_pn;
 321         struct zfcp_adapter *adapter = erp_action->adapter;
 322
 323         gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
 324         if (!gid_pn)
 325                 return -ENOMEM;
 326
 327         memset(gid_pn, 0, sizeof(*gid_pn));
 328
 329         ret = zfcp_wka_port_get(&adapter->nsp);
 330         if (ret)
 331                 goto out;
 332
 333         ret = zfcp_fc_ns_gid_pn_request(erp_action, gid_pn);
 334
 335         zfcp_wka_port_put(&adapter->nsp);
 336 out:
 337         mempool_free(gid_pn, adapter->pool.data_gid_pn);
 338         return ret;
 339 }
 340
 341 /**
 342  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 343  * @port: zfcp_port structure
 344  * @plogi: plogi payload
 345  *
 346  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 347  */
 348 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
 349 {
 350         port->maxframe_size = plogi->serv_param.common_serv_param[7] |
 351                 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
 352         if (plogi->serv_param.class1_serv_param[0] & 0x80)
 353                 port->supported_classes |= FC_COS_CLASS1;
 354         if (plogi->serv_param.class2_serv_param[0] & 0x80)
 355                 port->supported_classes |= FC_COS_CLASS2;
 356         if (plogi->serv_param.class3_serv_param[0] & 0x80)
 357                 port->supported_classes |= FC_COS_CLASS3;
 358         if (plogi->serv_param.class4_serv_param[0] & 0x80)
 359                 port->supported_classes |= FC_COS_CLASS4;
 360 }
 361
 362 struct zfcp_els_adisc {
 363         struct zfcp_send_els els;
 364         struct scatterlist req;
 365         struct scatterlist resp;
 366         struct zfcp_ls_adisc ls_adisc;
 367         struct zfcp_ls_adisc ls_adisc_acc;
 368 };
 369
 370 static void zfcp_fc_adisc_handler(unsigned long data)
 371 {
 372         struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data;
 373         struct zfcp_port *port = adisc->els.port;
 374         struct zfcp_ls_adisc *ls_adisc = &adisc->ls_adisc_acc;
 375
 376         if (adisc->els.status) {
 377                 /* request rejected or timed out */
 378                 zfcp_erp_port_forced_reopen(port, 0, 63, NULL);
 379                 goto out;
 380         }
 381
 382         if (!port->wwnn)
 383                 port->wwnn = ls_adisc->wwnn;
 384
 385         if (port->wwpn != ls_adisc->wwpn)
 386                 zfcp_erp_port_reopen(port, 0, 64, NULL);
 387
 388  out:
 389         zfcp_port_put(port);
 390         kfree(adisc);
 391 }
 392
 393 static int zfcp_fc_adisc(struct zfcp_port *port)
 394 {
 395         struct zfcp_els_adisc *adisc;
 396         struct zfcp_adapter *adapter = port->adapter;
 397
 398         adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
 399         if (!adisc)
 400                 return -ENOMEM;
 401
 402         adisc->els.req = &adisc->req;
 403         adisc->els.resp = &adisc->resp;
 404         sg_init_one(adisc->els.req, &adisc->ls_adisc,
 405                     sizeof(struct zfcp_ls_adisc));
 406         sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
 407                     sizeof(struct zfcp_ls_adisc));
 408
 409         adisc->els.adapter = adapter;
 410         adisc->els.port = port;
 411         adisc->els.d_id = port->d_id;
 412         adisc->els.handler = zfcp_fc_adisc_handler;
 413         adisc->els.handler_data = (unsigned long) adisc;
 414         adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
 415
 416         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 417            without FC-AL-2 capability, so we don't set it */
 418         adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
 419         adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
 420         adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
 421
 422         return zfcp_fsf_send_els(&adisc->els);
 423 }
 424
 425 /**
 426  * zfcp_test_link - lightweight link test procedure
 427  * @port: port to be tested
 428  *
 429  * Test status of a link to a remote port using the ELS command ADISC.
 430  * If there is a problem with the remote port, error recovery steps
 431  * will be triggered.
 432  */
 433 void zfcp_test_link(struct zfcp_port *port)
 434 {
 435         int retval;
 436
 437         zfcp_port_get(port);
 438         retval = zfcp_fc_adisc(port);
 439         if (retval == 0)
 440                 return;
 441
 442         /* send of ADISC was not possible */
 443         zfcp_port_put(port);
 444         if (retval != -EBUSY)
 445                 zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
 446 }
 447
 448 static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft, int buf_num)
 449 {
 450         struct scatterlist *sg = &gpn_ft->sg_req;
 451
 452         kfree(sg_virt(sg)); /* free request buffer */
 453         zfcp_sg_free_table(gpn_ft->sg_resp, buf_num);
 454
 455         kfree(gpn_ft);
 456 }
 457
 458 static struct zfcp_gpn_ft *zfcp_alloc_sg_env(int buf_num)
 459 {
 460         struct zfcp_gpn_ft *gpn_ft;
 461         struct ct_iu_gpn_ft_req *req;
 462
 463         gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
 464         if (!gpn_ft)
 465                 return NULL;
 466
 467         req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL);
 468         if (!req) {
 469                 kfree(gpn_ft);
 470                 gpn_ft = NULL;
 471                 goto out;
 472         }
 473         sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
 474
 475         if (zfcp_sg_setup_table(gpn_ft->sg_resp, buf_num)) {
 476                 zfcp_free_sg_env(gpn_ft, buf_num);
 477                 gpn_ft = NULL;
 478         }
 479 out:
 480         return gpn_ft;
 481 }
 482
 483
 484 static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
 485                                   struct zfcp_adapter *adapter,
 486                                   int max_bytes)
 487 {
 488         struct zfcp_send_ct *ct = &gpn_ft->ct;
 489         struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
 490         struct zfcp_fc_ns_handler_data compl_rec;
 491         int ret;
 492
 493         /* prepare CT IU for GPN_FT */
 494         req->header.revision = ZFCP_CT_REVISION;
 495         req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 496         req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
 497         req->header.options = ZFCP_CT_SYNCHRONOUS;
 498         req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
 499         req->header.max_res_size = max_bytes / 4;
 500         req->flags = 0;
 501         req->domain_id_scope = 0;
 502         req->area_id_scope = 0;
 503         req->fc4_type = ZFCP_CT_SCSI_FCP;
 504
 505         /* prepare zfcp_send_ct */
 506         ct->wka_port = &adapter->nsp;
 507         ct->handler = zfcp_fc_ns_handler;
 508         ct->handler_data = (unsigned long)&compl_rec;
 509         ct->timeout = 10;
 510         ct->req = &gpn_ft->sg_req;
 511         ct->resp = gpn_ft->sg_resp;
 512
 513         init_completion(&compl_rec.done);
 514         compl_rec.handler = NULL;
 515         ret = zfcp_fsf_send_ct(ct, NULL, NULL);
 516         if (!ret)
 517                 wait_for_completion(&compl_rec.done);
 518         return ret;
 519 }
 520
 521 static void zfcp_validate_port(struct zfcp_port *port)
 522 {
 523         struct zfcp_adapter *adapter = port->adapter;
 524
 525         atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
 526
 527         if ((port->supported_classes != 0) ||
 528             !list_empty(&port->unit_list_head)) {
 529                 zfcp_port_put(port);
 530                 return;
 531         }
 532         zfcp_erp_port_shutdown(port, 0, 151, NULL);
 533         zfcp_erp_wait(adapter);
 534         zfcp_port_put(port);
 535         zfcp_port_dequeue(port);
 536 }
 537
 538 static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft, int max_entries)
 539 {
 540         struct zfcp_send_ct *ct = &gpn_ft->ct;
 541         struct scatterlist *sg = gpn_ft->sg_resp;
 542         struct ct_hdr *hdr = sg_virt(sg);
 543         struct gpn_ft_resp_acc *acc = sg_virt(sg);
 544         struct zfcp_adapter *adapter = ct->wka_port->adapter;
 545         struct zfcp_port *port, *tmp;
 546         u32 d_id;
 547         int ret = 0, x, last = 0;
 548
 549         if (ct->status)
 550                 return -EIO;
 551
 552         if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
 553                 if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
 554                         return -EAGAIN; /* might be a temporary condition */
 555                 return -EIO;
 556         }
 557
 558         if (hdr->max_res_size) {
 559                 dev_warn(&adapter->ccw_device->dev,
 560                          "The name server reported %d words residual data\n",
 561                          hdr->max_res_size);
 562                 return -E2BIG;
 563         }
 564
 565         down(&zfcp_data.config_sema);
 566
 567         /* first entry is the header */
 568         for (x = 1; x < max_entries && !last; x++) {
 569                 if (x % (ZFCP_GPN_FT_ENTRIES + 1))
 570                         acc++;
 571                 else
 572                         acc = sg_virt(++sg);
 573
 574                 last = acc->control & 0x80;
 575                 d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 |
 576                        acc->port_id[2];
 577
 578                 /* don't attach ports with a well known address */
 579                 if ((d_id & ZFCP_DID_WKA) == ZFCP_DID_WKA)
 580                         continue;
 581                 /* skip the adapter's port and known remote ports */
 582                 if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
 583                         continue;
 584                 port = zfcp_get_port_by_wwpn(adapter, acc->wwpn);
 585                 if (port) {
 586                         zfcp_port_get(port);
 587                         continue;
 588                 }
 589
 590                 port = zfcp_port_enqueue(adapter, acc->wwpn,
 591                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 592                 if (IS_ERR(port))
 593                         ret = PTR_ERR(port);
 594                 else
 595                         zfcp_erp_port_reopen(port, 0, 149, NULL);
 596         }
 597
 598         zfcp_erp_wait(adapter);
 599         list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list)
 600                 zfcp_validate_port(port);
 601         up(&zfcp_data.config_sema);
 602         return ret;
 603 }
 604
 605 /**
 606  * zfcp_scan_ports - scan remote ports and attach new ports
 607  * @adapter: pointer to struct zfcp_adapter
 608  */
 609 int zfcp_scan_ports(struct zfcp_adapter *adapter)
 610 {
 611         int ret, i;
 612         struct zfcp_gpn_ft *gpn_ft;
 613         int chain, max_entries, buf_num, max_bytes;
 614
 615         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 616         buf_num = chain ? ZFCP_GPN_FT_BUFFERS : 1;
 617         max_entries = chain ? ZFCP_GPN_FT_MAX_ENTRIES : ZFCP_GPN_FT_ENTRIES;
 618         max_bytes = chain ? ZFCP_GPN_FT_MAX_SIZE : ZFCP_CT_SIZE_ONE_PAGE;
 619
 620         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT)
 621                 return 0;
 622
 623         ret = zfcp_wka_port_get(&adapter->nsp);
 624         if (ret)
 625                 return ret;
 626
 627         gpn_ft = zfcp_alloc_sg_env(buf_num);
 628         if (!gpn_ft) {
 629                 ret = -ENOMEM;
 630                 goto out;
 631         }
 632
 633         for (i = 0; i < 3; i++) {
 634                 ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter, max_bytes);
 635                 if (!ret) {
 636                         ret = zfcp_scan_eval_gpn_ft(gpn_ft, max_entries);
 637                         if (ret == -EAGAIN)
 638                                 ssleep(1);
 639                         else
 640                                 break;
 641                 }
 642         }
 643         zfcp_free_sg_env(gpn_ft, buf_num);
 644 out:
 645         zfcp_wka_port_put(&adapter->nsp);
 646         return ret;
 647 }
 648
 649
 650 void _zfcp_scan_ports_later(struct work_struct *work)
 651 {
 652         zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work));
 653 }