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 milliseconds, 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                 if (!port->d_id)
 157                         zfcp_erp_port_reopen(port,
 158                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 159                                              "fcrscn1", NULL);
 160         }
 161
 162         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 163 }
 164
 165 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 166 {
 167         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 168         struct fcp_rscn_head *fcp_rscn_head;
 169         struct fcp_rscn_element *fcp_rscn_element;
 170         u16 i;
 171         u16 no_entries;
 172         u32 range_mask;
 173
 174         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload.data;
 175         fcp_rscn_element = (struct fcp_rscn_element *) fcp_rscn_head;
 176
 177         /* see FC-FS */
 178         no_entries = fcp_rscn_head->payload_len /
 179                         sizeof(struct fcp_rscn_element);
 180
 181         for (i = 1; i < no_entries; i++) {
 182                 /* skip head and start with 1st element */
 183                 fcp_rscn_element++;
 184                 range_mask = rscn_range_mask[fcp_rscn_element->addr_format];
 185                 _zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
 186         }
 187         schedule_work(&fsf_req->adapter->scan_work);
 188 }
 189
 190 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 191 {
 192         struct zfcp_adapter *adapter = req->adapter;
 193         struct zfcp_port *port;
 194         unsigned long flags;
 195
 196         read_lock_irqsave(&zfcp_data.config_lock, flags);
 197         list_for_each_entry(port, &adapter->port_list_head, list)
 198                 if (port->wwpn == wwpn)
 199                         break;
 200         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 201
 202         if (port && (port->wwpn == wwpn))
 203                 zfcp_erp_port_forced_reopen(port, 0, "fciwwp1", req);
 204 }
 205
 206 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 207 {
 208         struct fsf_status_read_buffer *status_buffer =
 209                 (struct fsf_status_read_buffer *)req->data;
 210         struct fsf_plogi *els_plogi =
 211                 (struct fsf_plogi *) status_buffer->payload.data;
 212
 213         zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
 214 }
 215
 216 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 217 {
 218         struct fsf_status_read_buffer *status_buffer =
 219                 (struct fsf_status_read_buffer *)req->data;
 220         struct fcp_logo *els_logo =
 221                 (struct fcp_logo *) status_buffer->payload.data;
 222
 223         zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
 224 }
 225
 226 /**
 227  * zfcp_fc_incoming_els - handle incoming ELS
 228  * @fsf_req - request which contains incoming ELS
 229  */
 230 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 231 {
 232         struct fsf_status_read_buffer *status_buffer =
 233                 (struct fsf_status_read_buffer *) fsf_req->data;
 234         unsigned int els_type = status_buffer->payload.data[0];
 235
 236         zfcp_san_dbf_event_incoming_els(fsf_req);
 237         if (els_type == LS_PLOGI)
 238                 zfcp_fc_incoming_plogi(fsf_req);
 239         else if (els_type == LS_LOGO)
 240                 zfcp_fc_incoming_logo(fsf_req);
 241         else if (els_type == LS_RSCN)
 242                 zfcp_fc_incoming_rscn(fsf_req);
 243 }
 244
 245 static void zfcp_fc_ns_handler(unsigned long data)
 246 {
 247         struct zfcp_fc_ns_handler_data *compl_rec =
 248                         (struct zfcp_fc_ns_handler_data *) data;
 249
 250         if (compl_rec->handler)
 251                 compl_rec->handler(compl_rec->handler_data);
 252
 253         complete(&compl_rec->done);
 254 }
 255
 256 static void zfcp_fc_ns_gid_pn_eval(unsigned long data)
 257 {
 258         struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data;
 259         struct zfcp_send_ct *ct = &gid_pn->ct;
 260         struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
 261         struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
 262         struct zfcp_port *port = gid_pn->port;
 263
 264         if (ct->status)
 265                 return;
 266         if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT)
 267                 return;
 268
 269         /* paranoia */
 270         if (ct_iu_req->wwpn != port->wwpn)
 271                 return;
 272         /* looks like a valid d_id */
 273         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
 274 }
 275
 276 int static zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action,
 277                                      struct zfcp_gid_pn_data *gid_pn)
 278 {
 279         struct zfcp_adapter *adapter = erp_action->adapter;
 280         struct zfcp_fc_ns_handler_data compl_rec;
 281         int ret;
 282
 283         /* setup parameters for send generic command */
 284         gid_pn->port = erp_action->port;
 285         gid_pn->ct.wka_port = &adapter->nsp;
 286         gid_pn->ct.handler = zfcp_fc_ns_handler;
 287         gid_pn->ct.handler_data = (unsigned long) &compl_rec;
 288         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
 289         gid_pn->ct.req = &gid_pn->req;
 290         gid_pn->ct.resp = &gid_pn->resp;
 291         sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
 292                     sizeof(struct ct_iu_gid_pn_req));
 293         sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
 294                     sizeof(struct ct_iu_gid_pn_resp));
 295
 296         /* setup nameserver request */
 297         gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
 298         gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 299         gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
 300         gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
 301         gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
 302         gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_SIZE_ONE_PAGE / 4;
 303         gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
 304
 305         init_completion(&compl_rec.done);
 306         compl_rec.handler = zfcp_fc_ns_gid_pn_eval;
 307         compl_rec.handler_data = (unsigned long) gid_pn;
 308         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
 309                                erp_action);
 310         if (!ret)
 311                 wait_for_completion(&compl_rec.done);
 312         return ret;
 313 }
 314
 315 /**
 316  * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
 317  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
 318  * return: -ENOMEM on error, 0 otherwise
 319  */
 320 int zfcp_fc_ns_gid_pn(struct zfcp_erp_action *erp_action)
 321 {
 322         int ret;
 323         struct zfcp_gid_pn_data *gid_pn;
 324         struct zfcp_adapter *adapter = erp_action->adapter;
 325
 326         gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
 327         if (!gid_pn)
 328                 return -ENOMEM;
 329
 330         memset(gid_pn, 0, sizeof(*gid_pn));
 331
 332         ret = zfcp_wka_port_get(&adapter->nsp);
 333         if (ret)
 334                 goto out;
 335
 336         ret = zfcp_fc_ns_gid_pn_request(erp_action, gid_pn);
 337
 338         zfcp_wka_port_put(&adapter->nsp);
 339 out:
 340         mempool_free(gid_pn, adapter->pool.data_gid_pn);
 341         return ret;
 342 }
 343
 344 /**
 345  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 346  * @port: zfcp_port structure
 347  * @plogi: plogi payload
 348  *
 349  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 350  */
 351 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
 352 {
 353         port->maxframe_size = plogi->serv_param.common_serv_param[7] |
 354                 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
 355         if (plogi->serv_param.class1_serv_param[0] & 0x80)
 356                 port->supported_classes |= FC_COS_CLASS1;
 357         if (plogi->serv_param.class2_serv_param[0] & 0x80)
 358                 port->supported_classes |= FC_COS_CLASS2;
 359         if (plogi->serv_param.class3_serv_param[0] & 0x80)
 360                 port->supported_classes |= FC_COS_CLASS3;
 361         if (plogi->serv_param.class4_serv_param[0] & 0x80)
 362                 port->supported_classes |= FC_COS_CLASS4;
 363 }
 364
 365 struct zfcp_els_adisc {
 366         struct zfcp_send_els els;
 367         struct scatterlist req;
 368         struct scatterlist resp;
 369         struct zfcp_ls_adisc ls_adisc;
 370         struct zfcp_ls_adisc ls_adisc_acc;
 371 };
 372
 373 static void zfcp_fc_adisc_handler(unsigned long data)
 374 {
 375         struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data;
 376         struct zfcp_port *port = adisc->els.port;
 377         struct zfcp_ls_adisc *ls_adisc = &adisc->ls_adisc_acc;
 378
 379         if (adisc->els.status) {
 380                 /* request rejected or timed out */
 381                 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 382                                             "fcadh_1", NULL);
 383                 goto out;
 384         }
 385
 386         if (!port->wwnn)
 387                 port->wwnn = ls_adisc->wwnn;
 388
 389         if ((port->wwpn != ls_adisc->wwpn) ||
 390             !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 391                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 392                                      "fcadh_2", NULL);
 393                 goto out;
 394         }
 395
 396         /* port is good, unblock rport without going through erp */
 397         zfcp_scsi_schedule_rport_register(port);
 398  out:
 399         zfcp_port_put(port);
 400         kfree(adisc);
 401 }
 402
 403 static int zfcp_fc_adisc(struct zfcp_port *port)
 404 {
 405         struct zfcp_els_adisc *adisc;
 406         struct zfcp_adapter *adapter = port->adapter;
 407
 408         adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
 409         if (!adisc)
 410                 return -ENOMEM;
 411
 412         adisc->els.req = &adisc->req;
 413         adisc->els.resp = &adisc->resp;
 414         sg_init_one(adisc->els.req, &adisc->ls_adisc,
 415                     sizeof(struct zfcp_ls_adisc));
 416         sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
 417                     sizeof(struct zfcp_ls_adisc));
 418
 419         adisc->els.adapter = adapter;
 420         adisc->els.port = port;
 421         adisc->els.d_id = port->d_id;
 422         adisc->els.handler = zfcp_fc_adisc_handler;
 423         adisc->els.handler_data = (unsigned long) adisc;
 424         adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
 425
 426         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 427            without FC-AL-2 capability, so we don't set it */
 428         adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
 429         adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
 430         adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
 431
 432         return zfcp_fsf_send_els(&adisc->els);
 433 }
 434
 435 void zfcp_fc_link_test_work(struct work_struct *work)
 436 {
 437         struct zfcp_port *port =
 438                 container_of(work, struct zfcp_port, test_link_work);
 439         int retval;
 440
 441         zfcp_port_get(port);
 442         port->rport_task = RPORT_DEL;
 443         zfcp_scsi_rport_work(&port->rport_work);
 444
 445         retval = zfcp_fc_adisc(port);
 446         if (retval == 0)
 447                 return;
 448
 449         /* send of ADISC was not possible */
 450         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1", NULL);
 451
 452         zfcp_port_put(port);
 453 }
 454
 455 /**
 456  * zfcp_test_link - lightweight link test procedure
 457  * @port: port to be tested
 458  *
 459  * Test status of a link to a remote port using the ELS command ADISC.
 460  * If there is a problem with the remote port, error recovery steps
 461  * will be triggered.
 462  */
 463 void zfcp_test_link(struct zfcp_port *port)
 464 {
 465         zfcp_port_get(port);
 466         if (!queue_work(zfcp_data.work_queue, &port->test_link_work))
 467                 zfcp_port_put(port);
 468 }
 469
 470 static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft, int buf_num)
 471 {
 472         struct scatterlist *sg = &gpn_ft->sg_req;
 473
 474         kfree(sg_virt(sg)); /* free request buffer */
 475         zfcp_sg_free_table(gpn_ft->sg_resp, buf_num);
 476
 477         kfree(gpn_ft);
 478 }
 479
 480 static struct zfcp_gpn_ft *zfcp_alloc_sg_env(int buf_num)
 481 {
 482         struct zfcp_gpn_ft *gpn_ft;
 483         struct ct_iu_gpn_ft_req *req;
 484
 485         gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
 486         if (!gpn_ft)
 487                 return NULL;
 488
 489         req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL);
 490         if (!req) {
 491                 kfree(gpn_ft);
 492                 gpn_ft = NULL;
 493                 goto out;
 494         }
 495         sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
 496
 497         if (zfcp_sg_setup_table(gpn_ft->sg_resp, buf_num)) {
 498                 zfcp_free_sg_env(gpn_ft, buf_num);
 499                 gpn_ft = NULL;
 500         }
 501 out:
 502         return gpn_ft;
 503 }
 504
 505
 506 static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
 507                                   struct zfcp_adapter *adapter,
 508                                   int max_bytes)
 509 {
 510         struct zfcp_send_ct *ct = &gpn_ft->ct;
 511         struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
 512         struct zfcp_fc_ns_handler_data compl_rec;
 513         int ret;
 514
 515         /* prepare CT IU for GPN_FT */
 516         req->header.revision = ZFCP_CT_REVISION;
 517         req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 518         req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
 519         req->header.options = ZFCP_CT_SYNCHRONOUS;
 520         req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
 521         req->header.max_res_size = max_bytes / 4;
 522         req->flags = 0;
 523         req->domain_id_scope = 0;
 524         req->area_id_scope = 0;
 525         req->fc4_type = ZFCP_CT_SCSI_FCP;
 526
 527         /* prepare zfcp_send_ct */
 528         ct->wka_port = &adapter->nsp;
 529         ct->handler = zfcp_fc_ns_handler;
 530         ct->handler_data = (unsigned long)&compl_rec;
 531         ct->timeout = 10;
 532         ct->req = &gpn_ft->sg_req;
 533         ct->resp = gpn_ft->sg_resp;
 534
 535         init_completion(&compl_rec.done);
 536         compl_rec.handler = NULL;
 537         ret = zfcp_fsf_send_ct(ct, NULL, NULL);
 538         if (!ret)
 539                 wait_for_completion(&compl_rec.done);
 540         return ret;
 541 }
 542
 543 static void zfcp_validate_port(struct zfcp_port *port)
 544 {
 545         struct zfcp_adapter *adapter = port->adapter;
 546
 547         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 548                 return;
 549
 550         atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
 551
 552         if ((port->supported_classes != 0) ||
 553             !list_empty(&port->unit_list_head)) {
 554                 zfcp_port_put(port);
 555                 return;
 556         }
 557         zfcp_erp_port_shutdown(port, 0, "fcpval1", NULL);
 558         zfcp_erp_wait(adapter);
 559         zfcp_port_put(port);
 560         zfcp_port_dequeue(port);
 561 }
 562
 563 static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft, int max_entries)
 564 {
 565         struct zfcp_send_ct *ct = &gpn_ft->ct;
 566         struct scatterlist *sg = gpn_ft->sg_resp;
 567         struct ct_hdr *hdr = sg_virt(sg);
 568         struct gpn_ft_resp_acc *acc = sg_virt(sg);
 569         struct zfcp_adapter *adapter = ct->wka_port->adapter;
 570         struct zfcp_port *port, *tmp;
 571         u32 d_id;
 572         int ret = 0, x, last = 0;
 573
 574         if (ct->status)
 575                 return -EIO;
 576
 577         if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
 578                 if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
 579                         return -EAGAIN; /* might be a temporary condition */
 580                 return -EIO;
 581         }
 582
 583         if (hdr->max_res_size) {
 584                 dev_warn(&adapter->ccw_device->dev,
 585                          "The name server reported %d words residual data\n",
 586                          hdr->max_res_size);
 587                 return -E2BIG;
 588         }
 589
 590         down(&zfcp_data.config_sema);
 591
 592         /* first entry is the header */
 593         for (x = 1; x < max_entries && !last; x++) {
 594                 if (x % (ZFCP_GPN_FT_ENTRIES + 1))
 595                         acc++;
 596                 else
 597                         acc = sg_virt(++sg);
 598
 599                 last = acc->control & 0x80;
 600                 d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 |
 601                        acc->port_id[2];
 602
 603                 /* don't attach ports with a well known address */
 604                 if ((d_id & ZFCP_DID_WKA) == ZFCP_DID_WKA)
 605                         continue;
 606                 /* skip the adapter's port and known remote ports */
 607                 if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
 608                         continue;
 609                 port = zfcp_get_port_by_wwpn(adapter, acc->wwpn);
 610                 if (port)
 611                         continue;
 612
 613                 port = zfcp_port_enqueue(adapter, acc->wwpn,
 614                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 615                 if (IS_ERR(port))
 616                         ret = PTR_ERR(port);
 617                 else
 618                         zfcp_erp_port_reopen(port, 0, "fcegpf1", NULL);
 619         }
 620
 621         zfcp_erp_wait(adapter);
 622         list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list)
 623                 zfcp_validate_port(port);
 624         up(&zfcp_data.config_sema);
 625         return ret;
 626 }
 627
 628 /**
 629  * zfcp_scan_ports - scan remote ports and attach new ports
 630  * @adapter: pointer to struct zfcp_adapter
 631  */
 632 int zfcp_scan_ports(struct zfcp_adapter *adapter)
 633 {
 634         int ret, i;
 635         struct zfcp_gpn_ft *gpn_ft;
 636         int chain, max_entries, buf_num, max_bytes;
 637
 638         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 639         buf_num = chain ? ZFCP_GPN_FT_BUFFERS : 1;
 640         max_entries = chain ? ZFCP_GPN_FT_MAX_ENTRIES : ZFCP_GPN_FT_ENTRIES;
 641         max_bytes = chain ? ZFCP_GPN_FT_MAX_SIZE : ZFCP_CT_SIZE_ONE_PAGE;
 642
 643         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 644             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 645                 return 0;
 646
 647         ret = zfcp_wka_port_get(&adapter->nsp);
 648         if (ret)
 649                 return ret;
 650
 651         gpn_ft = zfcp_alloc_sg_env(buf_num);
 652         if (!gpn_ft) {
 653                 ret = -ENOMEM;
 654                 goto out;
 655         }
 656
 657         for (i = 0; i < 3; i++) {
 658                 ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter, max_bytes);
 659                 if (!ret) {
 660                         ret = zfcp_scan_eval_gpn_ft(gpn_ft, max_entries);
 661                         if (ret == -EAGAIN)
 662                                 ssleep(1);
 663                         else
 664                                 break;
 665                 }
 666         }
 667         zfcp_free_sg_env(gpn_ft, buf_num);
 668 out:
 669         zfcp_wka_port_put(&adapter->nsp);
 670         return ret;
 671 }
 672
 673
 674 void _zfcp_scan_ports_later(struct work_struct *work)
 675 {
 676         zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work));
 677 }