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, 2009
   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         /* Don't wait forvever. If the wka_port is too busy take it offline
 102            through a new call later */
 103         if (!wait_event_timeout(wka_port->completion_wq,
 104                                 atomic_read(&wka_port->refcount) == 0,
 105                                 HZ >> 1))
 106                 return;
 107
 108         mutex_lock(&wka_port->mutex);
 109         if ((atomic_read(&wka_port->refcount) != 0) ||
 110             (wka_port->status != ZFCP_WKA_PORT_ONLINE))
 111                 goto out;
 112
 113         wka_port->status = ZFCP_WKA_PORT_CLOSING;
 114         if (zfcp_fsf_close_wka_port(wka_port)) {
 115                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
 116                 wake_up(&wka_port->completion_wq);
 117         }
 118 out:
 119         mutex_unlock(&wka_port->mutex);
 120 }
 121
 122 static void zfcp_wka_port_put(struct zfcp_wka_port *wka_port)
 123 {
 124         if (atomic_dec_return(&wka_port->refcount) != 0)
 125                 return;
 126         /* wait 10 miliseconds, other reqs might pop in */
 127         schedule_delayed_work(&wka_port->work, HZ / 100);
 128 }
 129
 130 void zfcp_fc_nameserver_init(struct zfcp_adapter *adapter)
 131 {
 132         struct zfcp_wka_port *wka_port = &adapter->nsp;
 133
 134         init_waitqueue_head(&wka_port->completion_wq);
 135
 136         wka_port->adapter = adapter;
 137         wka_port->d_id = ZFCP_DID_DIRECTORY_SERVICE;
 138
 139         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
 140         atomic_set(&wka_port->refcount, 0);
 141         mutex_init(&wka_port->mutex);
 142         INIT_DELAYED_WORK(&wka_port->work, zfcp_wka_port_offline);
 143 }
 144
 145 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
 146                                    struct fcp_rscn_element *elem)
 147 {
 148         unsigned long flags;
 149         struct zfcp_port *port;
 150
 151         read_lock_irqsave(&zfcp_data.config_lock, flags);
 152         list_for_each_entry(port, &fsf_req->adapter->port_list_head, list)
 153                 if ((port->d_id & range) == (elem->nport_did & range))
 154                         zfcp_test_link(port);
 155
 156         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 157 }
 158
 159 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 160 {
 161         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 162         struct fcp_rscn_head *fcp_rscn_head;
 163         struct fcp_rscn_element *fcp_rscn_element;
 164         u16 i;
 165         u16 no_entries;
 166         u32 range_mask;
 167
 168         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload.data;
 169         fcp_rscn_element = (struct fcp_rscn_element *) fcp_rscn_head;
 170
 171         /* see FC-FS */
 172         no_entries = fcp_rscn_head->payload_len /
 173                         sizeof(struct fcp_rscn_element);
 174
 175         for (i = 1; i < no_entries; i++) {
 176                 /* skip head and start with 1st element */
 177                 fcp_rscn_element++;
 178                 range_mask = rscn_range_mask[fcp_rscn_element->addr_format];
 179                 _zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
 180         }
 181         schedule_work(&fsf_req->adapter->scan_work);
 182 }
 183
 184 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 185 {
 186         struct zfcp_adapter *adapter = req->adapter;
 187         struct zfcp_port *port;
 188         unsigned long flags;
 189
 190         read_lock_irqsave(&zfcp_data.config_lock, flags);
 191         list_for_each_entry(port, &adapter->port_list_head, list)
 192                 if (port->wwpn == wwpn)
 193                         break;
 194         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 195
 196         if (port && (port->wwpn == wwpn))
 197                 zfcp_erp_port_forced_reopen(port, 0, "fciwwp1", req);
 198 }
 199
 200 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 201 {
 202         struct fsf_status_read_buffer *status_buffer =
 203                 (struct fsf_status_read_buffer *)req->data;
 204         struct fsf_plogi *els_plogi =
 205                 (struct fsf_plogi *) status_buffer->payload.data;
 206
 207         zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
 208 }
 209
 210 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 211 {
 212         struct fsf_status_read_buffer *status_buffer =
 213                 (struct fsf_status_read_buffer *)req->data;
 214         struct fcp_logo *els_logo =
 215                 (struct fcp_logo *) status_buffer->payload.data;
 216
 217         zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
 218 }
 219
 220 /**
 221  * zfcp_fc_incoming_els - handle incoming ELS
 222  * @fsf_req - request which contains incoming ELS
 223  */
 224 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 225 {
 226         struct fsf_status_read_buffer *status_buffer =
 227                 (struct fsf_status_read_buffer *) fsf_req->data;
 228         unsigned int els_type = status_buffer->payload.data[0];
 229
 230         zfcp_san_dbf_event_incoming_els(fsf_req);
 231         if (els_type == LS_PLOGI)
 232                 zfcp_fc_incoming_plogi(fsf_req);
 233         else if (els_type == LS_LOGO)
 234                 zfcp_fc_incoming_logo(fsf_req);
 235         else if (els_type == LS_RSCN)
 236                 zfcp_fc_incoming_rscn(fsf_req);
 237 }
 238
 239 static void zfcp_fc_ns_handler(unsigned long data)
 240 {
 241         struct zfcp_fc_ns_handler_data *compl_rec =
 242                         (struct zfcp_fc_ns_handler_data *) data;
 243
 244         if (compl_rec->handler)
 245                 compl_rec->handler(compl_rec->handler_data);
 246
 247         complete(&compl_rec->done);
 248 }
 249
 250 static void zfcp_fc_ns_gid_pn_eval(unsigned long data)
 251 {
 252         struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data;
 253         struct zfcp_send_ct *ct = &gid_pn->ct;
 254         struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
 255         struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
 256         struct zfcp_port *port = gid_pn->port;
 257
 258         if (ct->status)
 259                 return;
 260         if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT)
 261                 return;
 262
 263         /* paranoia */
 264         if (ct_iu_req->wwpn != port->wwpn)
 265                 return;
 266         /* looks like a valid d_id */
 267         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
 268 }
 269
 270 int static zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action,
 271                                      struct zfcp_gid_pn_data *gid_pn)
 272 {
 273         struct zfcp_adapter *adapter = erp_action->adapter;
 274         struct zfcp_fc_ns_handler_data compl_rec;
 275         int ret;
 276
 277         /* setup parameters for send generic command */
 278         gid_pn->port = erp_action->port;
 279         gid_pn->ct.wka_port = &adapter->nsp;
 280         gid_pn->ct.handler = zfcp_fc_ns_handler;
 281         gid_pn->ct.handler_data = (unsigned long) &compl_rec;
 282         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
 283         gid_pn->ct.req = &gid_pn->req;
 284         gid_pn->ct.resp = &gid_pn->resp;
 285         sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
 286                     sizeof(struct ct_iu_gid_pn_req));
 287         sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
 288                     sizeof(struct ct_iu_gid_pn_resp));
 289
 290         /* setup nameserver request */
 291         gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
 292         gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 293         gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
 294         gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
 295         gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
 296         gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_SIZE_ONE_PAGE / 4;
 297         gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
 298
 299         init_completion(&compl_rec.done);
 300         compl_rec.handler = zfcp_fc_ns_gid_pn_eval;
 301         compl_rec.handler_data = (unsigned long) gid_pn;
 302         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
 303                                erp_action);
 304         if (!ret)
 305                 wait_for_completion(&compl_rec.done);
 306         return ret;
 307 }
 308
 309 /**
 310  * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
 311  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
 312  * return: -ENOMEM on error, 0 otherwise
 313  */
 314 int zfcp_fc_ns_gid_pn(struct zfcp_erp_action *erp_action)
 315 {
 316         int ret;
 317         struct zfcp_gid_pn_data *gid_pn;
 318         struct zfcp_adapter *adapter = erp_action->adapter;
 319
 320         gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
 321         if (!gid_pn)
 322                 return -ENOMEM;
 323
 324         memset(gid_pn, 0, sizeof(*gid_pn));
 325
 326         ret = zfcp_wka_port_get(&adapter->nsp);
 327         if (ret)
 328                 goto out;
 329
 330         ret = zfcp_fc_ns_gid_pn_request(erp_action, gid_pn);
 331
 332         zfcp_wka_port_put(&adapter->nsp);
 333 out:
 334         mempool_free(gid_pn, adapter->pool.data_gid_pn);
 335         return ret;
 336 }
 337
 338 /**
 339  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 340  * @port: zfcp_port structure
 341  * @plogi: plogi payload
 342  *
 343  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 344  */
 345 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
 346 {
 347         port->maxframe_size = plogi->serv_param.common_serv_param[7] |
 348                 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
 349         if (plogi->serv_param.class1_serv_param[0] & 0x80)
 350                 port->supported_classes |= FC_COS_CLASS1;
 351         if (plogi->serv_param.class2_serv_param[0] & 0x80)
 352                 port->supported_classes |= FC_COS_CLASS2;
 353         if (plogi->serv_param.class3_serv_param[0] & 0x80)
 354                 port->supported_classes |= FC_COS_CLASS3;
 355         if (plogi->serv_param.class4_serv_param[0] & 0x80)
 356                 port->supported_classes |= FC_COS_CLASS4;
 357 }
 358
 359 struct zfcp_els_adisc {
 360         struct zfcp_send_els els;
 361         struct scatterlist req;
 362         struct scatterlist resp;
 363         struct zfcp_ls_adisc ls_adisc;
 364         struct zfcp_ls_adisc ls_adisc_acc;
 365 };
 366
 367 static void zfcp_fc_adisc_handler(unsigned long data)
 368 {
 369         struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data;
 370         struct zfcp_port *port = adisc->els.port;
 371         struct zfcp_ls_adisc *ls_adisc = &adisc->ls_adisc_acc;
 372
 373         if (adisc->els.status) {
 374                 /* request rejected or timed out */
 375                 zfcp_erp_port_forced_reopen(port, 0, "fcadh_1", NULL);
 376                 goto out;
 377         }
 378
 379         if (!port->wwnn)
 380                 port->wwnn = ls_adisc->wwnn;
 381
 382         if ((port->wwpn != ls_adisc->wwpn) ||
 383             !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 384                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 385                                      "fcadh_2", NULL);
 386                 goto out;
 387         }
 388
 389         /* port is good, unblock rport without going through erp */
 390         zfcp_scsi_schedule_rport_register(port);
 391  out:
 392         zfcp_port_put(port);
 393         kfree(adisc);
 394 }
 395
 396 static int zfcp_fc_adisc(struct zfcp_port *port)
 397 {
 398         struct zfcp_els_adisc *adisc;
 399         struct zfcp_adapter *adapter = port->adapter;
 400
 401         adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
 402         if (!adisc)
 403                 return -ENOMEM;
 404
 405         adisc->els.req = &adisc->req;
 406         adisc->els.resp = &adisc->resp;
 407         sg_init_one(adisc->els.req, &adisc->ls_adisc,
 408                     sizeof(struct zfcp_ls_adisc));
 409         sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
 410                     sizeof(struct zfcp_ls_adisc));
 411
 412         adisc->els.adapter = adapter;
 413         adisc->els.port = port;
 414         adisc->els.d_id = port->d_id;
 415         adisc->els.handler = zfcp_fc_adisc_handler;
 416         adisc->els.handler_data = (unsigned long) adisc;
 417         adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
 418
 419         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 420            without FC-AL-2 capability, so we don't set it */
 421         adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
 422         adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
 423         adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
 424
 425         return zfcp_fsf_send_els(&adisc->els);
 426 }
 427
 428 void zfcp_fc_link_test_work(struct work_struct *work)
 429 {
 430         struct zfcp_port *port =
 431                 container_of(work, struct zfcp_port, test_link_work);
 432         int retval;
 433
 434         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_UNBLOCKED)) {
 435                 zfcp_port_put(port);
 436                 return; /* port erp is running and will update rport status */
 437         }
 438
 439         zfcp_port_get(port);
 440         port->rport_task = RPORT_DEL;
 441         zfcp_scsi_rport_work(&port->rport_work);
 442
 443         retval = zfcp_fc_adisc(port);
 444         if (retval == 0)
 445                 return;
 446
 447         /* send of ADISC was not possible */
 448         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1", NULL);
 449
 450         zfcp_port_put(port);
 451 }
 452
 453 /**
 454  * zfcp_test_link - lightweight link test procedure
 455  * @port: port to be tested
 456  *
 457  * Test status of a link to a remote port using the ELS command ADISC.
 458  * If there is a problem with the remote port, error recovery steps
 459  * will be triggered.
 460  */
 461 void zfcp_test_link(struct zfcp_port *port)
 462 {
 463         zfcp_port_get(port);
 464         if (!queue_work(zfcp_data.work_queue, &port->test_link_work))
 465                 zfcp_port_put(port);
 466 }
 467
 468 static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft, int buf_num)
 469 {
 470         struct scatterlist *sg = &gpn_ft->sg_req;
 471
 472         kfree(sg_virt(sg)); /* free request buffer */
 473         zfcp_sg_free_table(gpn_ft->sg_resp, buf_num);
 474
 475         kfree(gpn_ft);
 476 }
 477
 478 static struct zfcp_gpn_ft *zfcp_alloc_sg_env(int buf_num)
 479 {
 480         struct zfcp_gpn_ft *gpn_ft;
 481         struct ct_iu_gpn_ft_req *req;
 482
 483         gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
 484         if (!gpn_ft)
 485                 return NULL;
 486
 487         req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL);
 488         if (!req) {
 489                 kfree(gpn_ft);
 490                 gpn_ft = NULL;
 491                 goto out;
 492         }
 493         sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
 494
 495         if (zfcp_sg_setup_table(gpn_ft->sg_resp, buf_num)) {
 496                 zfcp_free_sg_env(gpn_ft, buf_num);
 497                 gpn_ft = NULL;
 498         }
 499 out:
 500         return gpn_ft;
 501 }
 502
 503
 504 static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
 505                                   struct zfcp_adapter *adapter,
 506                                   int max_bytes)
 507 {
 508         struct zfcp_send_ct *ct = &gpn_ft->ct;
 509         struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
 510         struct zfcp_fc_ns_handler_data compl_rec;
 511         int ret;
 512
 513         /* prepare CT IU for GPN_FT */
 514         req->header.revision = ZFCP_CT_REVISION;
 515         req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 516         req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
 517         req->header.options = ZFCP_CT_SYNCHRONOUS;
 518         req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
 519         req->header.max_res_size = max_bytes / 4;
 520         req->flags = 0;
 521         req->domain_id_scope = 0;
 522         req->area_id_scope = 0;
 523         req->fc4_type = ZFCP_CT_SCSI_FCP;
 524
 525         /* prepare zfcp_send_ct */
 526         ct->wka_port = &adapter->nsp;
 527         ct->handler = zfcp_fc_ns_handler;
 528         ct->handler_data = (unsigned long)&compl_rec;
 529         ct->timeout = 10;
 530         ct->req = &gpn_ft->sg_req;
 531         ct->resp = gpn_ft->sg_resp;
 532
 533         init_completion(&compl_rec.done);
 534         compl_rec.handler = NULL;
 535         ret = zfcp_fsf_send_ct(ct, NULL, NULL);
 536         if (!ret)
 537                 wait_for_completion(&compl_rec.done);
 538         return ret;
 539 }
 540
 541 static void zfcp_validate_port(struct zfcp_port *port)
 542 {
 543         struct zfcp_adapter *adapter = port->adapter;
 544
 545         atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
 546
 547         if ((port->supported_classes != 0) ||
 548             !list_empty(&port->unit_list_head)) {
 549                 zfcp_port_put(port);
 550                 return;
 551         }
 552         zfcp_erp_port_shutdown(port, 0, "fcpval1", NULL);
 553         zfcp_erp_wait(adapter);
 554         zfcp_port_put(port);
 555         zfcp_port_dequeue(port);
 556 }
 557
 558 static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft, int max_entries)
 559 {
 560         struct zfcp_send_ct *ct = &gpn_ft->ct;
 561         struct scatterlist *sg = gpn_ft->sg_resp;
 562         struct ct_hdr *hdr = sg_virt(sg);
 563         struct gpn_ft_resp_acc *acc = sg_virt(sg);
 564         struct zfcp_adapter *adapter = ct->wka_port->adapter;
 565         struct zfcp_port *port, *tmp;
 566         u32 d_id;
 567         int ret = 0, x, last = 0;
 568
 569         if (ct->status)
 570                 return -EIO;
 571
 572         if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
 573                 if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
 574                         return -EAGAIN; /* might be a temporary condition */
 575                 return -EIO;
 576         }
 577
 578         if (hdr->max_res_size) {
 579                 dev_warn(&adapter->ccw_device->dev,
 580                          "The name server reported %d words residual data\n",
 581                          hdr->max_res_size);
 582                 return -E2BIG;
 583         }
 584
 585         down(&zfcp_data.config_sema);
 586
 587         /* first entry is the header */
 588         for (x = 1; x < max_entries && !last; x++) {
 589                 if (x % (ZFCP_GPN_FT_ENTRIES + 1))
 590                         acc++;
 591                 else
 592                         acc = sg_virt(++sg);
 593
 594                 last = acc->control & 0x80;
 595                 d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 |
 596                        acc->port_id[2];
 597
 598                 /* don't attach ports with a well known address */
 599                 if ((d_id & ZFCP_DID_WKA) == ZFCP_DID_WKA)
 600                         continue;
 601                 /* skip the adapter's port and known remote ports */
 602                 if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
 603                         continue;
 604                 port = zfcp_get_port_by_wwpn(adapter, acc->wwpn);
 605                 if (port) {
 606                         zfcp_port_get(port);
 607                         continue;
 608                 }
 609
 610                 port = zfcp_port_enqueue(adapter, acc->wwpn,
 611                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 612                 if (IS_ERR(port))
 613                         ret = PTR_ERR(port);
 614                 else
 615                         zfcp_erp_port_reopen(port, 0, "fcegpf1", NULL);
 616         }
 617
 618         zfcp_erp_wait(adapter);
 619         list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list)
 620                 zfcp_validate_port(port);
 621         up(&zfcp_data.config_sema);
 622         return ret;
 623 }
 624
 625 /**
 626  * zfcp_scan_ports - scan remote ports and attach new ports
 627  * @adapter: pointer to struct zfcp_adapter
 628  */
 629 int zfcp_scan_ports(struct zfcp_adapter *adapter)
 630 {
 631         int ret, i;
 632         struct zfcp_gpn_ft *gpn_ft;
 633         int chain, max_entries, buf_num, max_bytes;
 634
 635         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 636         buf_num = chain ? ZFCP_GPN_FT_BUFFERS : 1;
 637         max_entries = chain ? ZFCP_GPN_FT_MAX_ENTRIES : ZFCP_GPN_FT_ENTRIES;
 638         max_bytes = chain ? ZFCP_GPN_FT_MAX_SIZE : ZFCP_CT_SIZE_ONE_PAGE;
 639
 640         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT)
 641                 return 0;
 642
 643         ret = zfcp_wka_port_get(&adapter->nsp);
 644         if (ret)
 645                 return ret;
 646
 647         gpn_ft = zfcp_alloc_sg_env(buf_num);
 648         if (!gpn_ft) {
 649                 ret = -ENOMEM;
 650                 goto out;
 651         }
 652
 653         for (i = 0; i < 3; i++) {
 654                 ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter, max_bytes);
 655                 if (!ret) {
 656                         ret = zfcp_scan_eval_gpn_ft(gpn_ft, max_entries);
 657                         if (ret == -EAGAIN)
 658                                 ssleep(1);
 659                         else
 660                                 break;
 661                 }
 662         }
 663         zfcp_free_sg_env(gpn_ft, buf_num);
 664 out:
 665         zfcp_wka_port_put(&adapter->nsp);
 666         return ret;
 667 }
 668
 669
 670 void _zfcp_scan_ports_later(struct work_struct *work)
 671 {
 672         zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work));
 673 }