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