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 static void zfcp_fc_wka_port_init(struct zfcp_wka_port *wka_port, u32 d_id,
 124                                   struct zfcp_adapter *adapter)
 125 {
 126         init_waitqueue_head(&wka_port->completion_wq);
 127
 128         wka_port->adapter = adapter;
 129         wka_port->d_id = d_id;
 130
 131         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
 132         atomic_set(&wka_port->refcount, 0);
 133         mutex_init(&wka_port->mutex);
 134         INIT_DELAYED_WORK(&wka_port->work, zfcp_wka_port_offline);
 135 }
 136
 137 void zfcp_fc_wka_port_force_offline(struct zfcp_wka_port *wka)
 138 {
 139         cancel_delayed_work_sync(&wka->work);
 140         mutex_lock(&wka->mutex);
 141         wka->status = ZFCP_WKA_PORT_OFFLINE;
 142         mutex_unlock(&wka->mutex);
 143 }
 144
 145 void zfcp_fc_wka_ports_init(struct zfcp_adapter *adapter)
 146 {
 147         struct zfcp_wka_ports *gs = adapter->gs;
 148
 149         zfcp_fc_wka_port_init(&gs->ms, FC_FID_MGMT_SERV, adapter);
 150         zfcp_fc_wka_port_init(&gs->ts, FC_FID_TIME_SERV, adapter);
 151         zfcp_fc_wka_port_init(&gs->ds, FC_FID_DIR_SERV, adapter);
 152         zfcp_fc_wka_port_init(&gs->as, FC_FID_ALIASES, adapter);
 153         zfcp_fc_wka_port_init(&gs->ks, FC_FID_SEC_KEY, adapter);
 154 }
 155
 156 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
 157                                    struct fcp_rscn_element *elem)
 158 {
 159         unsigned long flags;
 160         struct zfcp_port *port;
 161
 162         read_lock_irqsave(&zfcp_data.config_lock, flags);
 163         list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
 164                 if ((port->d_id & range) == (elem->nport_did & range))
 165                         zfcp_test_link(port);
 166                 if (!port->d_id)
 167                         zfcp_erp_port_reopen(port,
 168                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 169                                              "fcrscn1", NULL);
 170         }
 171
 172         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 173 }
 174
 175 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 176 {
 177         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 178         struct fcp_rscn_head *fcp_rscn_head;
 179         struct fcp_rscn_element *fcp_rscn_element;
 180         u16 i;
 181         u16 no_entries;
 182         u32 range_mask;
 183
 184         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload.data;
 185         fcp_rscn_element = (struct fcp_rscn_element *) fcp_rscn_head;
 186
 187         /* see FC-FS */
 188         no_entries = fcp_rscn_head->payload_len /
 189                         sizeof(struct fcp_rscn_element);
 190
 191         for (i = 1; i < no_entries; i++) {
 192                 /* skip head and start with 1st element */
 193                 fcp_rscn_element++;
 194                 range_mask = rscn_range_mask[fcp_rscn_element->addr_format];
 195                 _zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
 196         }
 197         schedule_work(&fsf_req->adapter->scan_work);
 198 }
 199
 200 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 201 {
 202         struct zfcp_adapter *adapter = req->adapter;
 203         struct zfcp_port *port;
 204         unsigned long flags;
 205
 206         read_lock_irqsave(&zfcp_data.config_lock, flags);
 207         list_for_each_entry(port, &adapter->port_list_head, list)
 208                 if (port->wwpn == wwpn)
 209                         break;
 210         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 211
 212         if (port && (port->wwpn == wwpn))
 213                 zfcp_erp_port_forced_reopen(port, 0, "fciwwp1", req);
 214 }
 215
 216 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 217 {
 218         struct fsf_status_read_buffer *status_buffer =
 219                 (struct fsf_status_read_buffer *)req->data;
 220         struct fsf_plogi *els_plogi =
 221                 (struct fsf_plogi *) status_buffer->payload.data;
 222
 223         zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
 224 }
 225
 226 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 227 {
 228         struct fsf_status_read_buffer *status_buffer =
 229                 (struct fsf_status_read_buffer *)req->data;
 230         struct fcp_logo *els_logo =
 231                 (struct fcp_logo *) status_buffer->payload.data;
 232
 233         zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
 234 }
 235
 236 /**
 237  * zfcp_fc_incoming_els - handle incoming ELS
 238  * @fsf_req - request which contains incoming ELS
 239  */
 240 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 241 {
 242         struct fsf_status_read_buffer *status_buffer =
 243                 (struct fsf_status_read_buffer *) fsf_req->data;
 244         unsigned int els_type = status_buffer->payload.data[0];
 245
 246         zfcp_san_dbf_event_incoming_els(fsf_req);
 247         if (els_type == LS_PLOGI)
 248                 zfcp_fc_incoming_plogi(fsf_req);
 249         else if (els_type == LS_LOGO)
 250                 zfcp_fc_incoming_logo(fsf_req);
 251         else if (els_type == LS_RSCN)
 252                 zfcp_fc_incoming_rscn(fsf_req);
 253 }
 254
 255 static void zfcp_fc_ns_handler(unsigned long data)
 256 {
 257         struct zfcp_fc_ns_handler_data *compl_rec =
 258                         (struct zfcp_fc_ns_handler_data *) data;
 259
 260         if (compl_rec->handler)
 261                 compl_rec->handler(compl_rec->handler_data);
 262
 263         complete(&compl_rec->done);
 264 }
 265
 266 static void zfcp_fc_ns_gid_pn_eval(unsigned long data)
 267 {
 268         struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data;
 269         struct zfcp_send_ct *ct = &gid_pn->ct;
 270         struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
 271         struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
 272         struct zfcp_port *port = gid_pn->port;
 273
 274         if (ct->status)
 275                 return;
 276         if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT)
 277                 return;
 278
 279         /* paranoia */
 280         if (ct_iu_req->wwpn != port->wwpn)
 281                 return;
 282         /* looks like a valid d_id */
 283         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
 284 }
 285
 286 int static zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action,
 287                                      struct zfcp_gid_pn_data *gid_pn)
 288 {
 289         struct zfcp_adapter *adapter = erp_action->adapter;
 290         struct zfcp_fc_ns_handler_data compl_rec;
 291         int ret;
 292
 293         /* setup parameters for send generic command */
 294         gid_pn->port = erp_action->port;
 295         gid_pn->ct.wka_port = &adapter->gs->ds;
 296         gid_pn->ct.handler = zfcp_fc_ns_handler;
 297         gid_pn->ct.handler_data = (unsigned long) &compl_rec;
 298         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
 299         gid_pn->ct.req = &gid_pn->req;
 300         gid_pn->ct.resp = &gid_pn->resp;
 301         sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
 302                     sizeof(struct ct_iu_gid_pn_req));
 303         sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
 304                     sizeof(struct ct_iu_gid_pn_resp));
 305
 306         /* setup nameserver request */
 307         gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
 308         gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 309         gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
 310         gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
 311         gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
 312         gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_SIZE_ONE_PAGE / 4;
 313         gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
 314
 315         init_completion(&compl_rec.done);
 316         compl_rec.handler = zfcp_fc_ns_gid_pn_eval;
 317         compl_rec.handler_data = (unsigned long) gid_pn;
 318         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
 319                                erp_action);
 320         if (!ret)
 321                 wait_for_completion(&compl_rec.done);
 322         return ret;
 323 }
 324
 325 /**
 326  * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
 327  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
 328  * return: -ENOMEM on error, 0 otherwise
 329  */
 330 int zfcp_fc_ns_gid_pn(struct zfcp_erp_action *erp_action)
 331 {
 332         int ret;
 333         struct zfcp_gid_pn_data *gid_pn;
 334         struct zfcp_adapter *adapter = erp_action->adapter;
 335
 336         gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
 337         if (!gid_pn)
 338                 return -ENOMEM;
 339
 340         memset(gid_pn, 0, sizeof(*gid_pn));
 341
 342         ret = zfcp_wka_port_get(&adapter->gs->ds);
 343         if (ret)
 344                 goto out;
 345
 346         ret = zfcp_fc_ns_gid_pn_request(erp_action, gid_pn);
 347
 348         zfcp_wka_port_put(&adapter->gs->ds);
 349 out:
 350         mempool_free(gid_pn, adapter->pool.data_gid_pn);
 351         return ret;
 352 }
 353
 354 /**
 355  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 356  * @port: zfcp_port structure
 357  * @plogi: plogi payload
 358  *
 359  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 360  */
 361 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
 362 {
 363         port->maxframe_size = plogi->serv_param.common_serv_param[7] |
 364                 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
 365         if (plogi->serv_param.class1_serv_param[0] & 0x80)
 366                 port->supported_classes |= FC_COS_CLASS1;
 367         if (plogi->serv_param.class2_serv_param[0] & 0x80)
 368                 port->supported_classes |= FC_COS_CLASS2;
 369         if (plogi->serv_param.class3_serv_param[0] & 0x80)
 370                 port->supported_classes |= FC_COS_CLASS3;
 371         if (plogi->serv_param.class4_serv_param[0] & 0x80)
 372                 port->supported_classes |= FC_COS_CLASS4;
 373 }
 374
 375 struct zfcp_els_adisc {
 376         struct zfcp_send_els els;
 377         struct scatterlist req;
 378         struct scatterlist resp;
 379         struct zfcp_ls_adisc ls_adisc;
 380         struct zfcp_ls_adisc ls_adisc_acc;
 381 };
 382
 383 static void zfcp_fc_adisc_handler(unsigned long data)
 384 {
 385         struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data;
 386         struct zfcp_port *port = adisc->els.port;
 387         struct zfcp_ls_adisc *ls_adisc = &adisc->ls_adisc_acc;
 388
 389         if (adisc->els.status) {
 390                 /* request rejected or timed out */
 391                 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 392                                             "fcadh_1", NULL);
 393                 goto out;
 394         }
 395
 396         if (!port->wwnn)
 397                 port->wwnn = ls_adisc->wwnn;
 398
 399         if ((port->wwpn != ls_adisc->wwpn) ||
 400             !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 401                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 402                                      "fcadh_2", NULL);
 403                 goto out;
 404         }
 405
 406         /* port is good, unblock rport without going through erp */
 407         zfcp_scsi_schedule_rport_register(port);
 408  out:
 409         zfcp_port_put(port);
 410         kfree(adisc);
 411 }
 412
 413 static int zfcp_fc_adisc(struct zfcp_port *port)
 414 {
 415         struct zfcp_els_adisc *adisc;
 416         struct zfcp_adapter *adapter = port->adapter;
 417
 418         adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
 419         if (!adisc)
 420                 return -ENOMEM;
 421
 422         adisc->els.req = &adisc->req;
 423         adisc->els.resp = &adisc->resp;
 424         sg_init_one(adisc->els.req, &adisc->ls_adisc,
 425                     sizeof(struct zfcp_ls_adisc));
 426         sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
 427                     sizeof(struct zfcp_ls_adisc));
 428
 429         adisc->els.adapter = adapter;
 430         adisc->els.port = port;
 431         adisc->els.d_id = port->d_id;
 432         adisc->els.handler = zfcp_fc_adisc_handler;
 433         adisc->els.handler_data = (unsigned long) adisc;
 434         adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
 435
 436         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 437            without FC-AL-2 capability, so we don't set it */
 438         adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
 439         adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
 440         adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
 441
 442         return zfcp_fsf_send_els(&adisc->els);
 443 }
 444
 445 void zfcp_fc_link_test_work(struct work_struct *work)
 446 {
 447         struct zfcp_port *port =
 448                 container_of(work, struct zfcp_port, test_link_work);
 449         int retval;
 450
 451         zfcp_port_get(port);
 452         port->rport_task = RPORT_DEL;
 453         zfcp_scsi_rport_work(&port->rport_work);
 454
 455         retval = zfcp_fc_adisc(port);
 456         if (retval == 0)
 457                 return;
 458
 459         /* send of ADISC was not possible */
 460         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1", NULL);
 461
 462         zfcp_port_put(port);
 463 }
 464
 465 /**
 466  * zfcp_test_link - lightweight link test procedure
 467  * @port: port to be tested
 468  *
 469  * Test status of a link to a remote port using the ELS command ADISC.
 470  * If there is a problem with the remote port, error recovery steps
 471  * will be triggered.
 472  */
 473 void zfcp_test_link(struct zfcp_port *port)
 474 {
 475         zfcp_port_get(port);
 476         if (!queue_work(zfcp_data.work_queue, &port->test_link_work))
 477                 zfcp_port_put(port);
 478 }
 479
 480 static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft, int buf_num)
 481 {
 482         struct scatterlist *sg = &gpn_ft->sg_req;
 483
 484         kfree(sg_virt(sg)); /* free request buffer */
 485         zfcp_sg_free_table(gpn_ft->sg_resp, buf_num);
 486
 487         kfree(gpn_ft);
 488 }
 489
 490 static struct zfcp_gpn_ft *zfcp_alloc_sg_env(int buf_num)
 491 {
 492         struct zfcp_gpn_ft *gpn_ft;
 493         struct ct_iu_gpn_ft_req *req;
 494
 495         gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
 496         if (!gpn_ft)
 497                 return NULL;
 498
 499         req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL);
 500         if (!req) {
 501                 kfree(gpn_ft);
 502                 gpn_ft = NULL;
 503                 goto out;
 504         }
 505         sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
 506
 507         if (zfcp_sg_setup_table(gpn_ft->sg_resp, buf_num)) {
 508                 zfcp_free_sg_env(gpn_ft, buf_num);
 509                 gpn_ft = NULL;
 510         }
 511 out:
 512         return gpn_ft;
 513 }
 514
 515
 516 static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
 517                                   struct zfcp_adapter *adapter,
 518                                   int max_bytes)
 519 {
 520         struct zfcp_send_ct *ct = &gpn_ft->ct;
 521         struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
 522         struct zfcp_fc_ns_handler_data compl_rec;
 523         int ret;
 524
 525         /* prepare CT IU for GPN_FT */
 526         req->header.revision = ZFCP_CT_REVISION;
 527         req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 528         req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
 529         req->header.options = ZFCP_CT_SYNCHRONOUS;
 530         req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
 531         req->header.max_res_size = max_bytes / 4;
 532         req->flags = 0;
 533         req->domain_id_scope = 0;
 534         req->area_id_scope = 0;
 535         req->fc4_type = ZFCP_CT_SCSI_FCP;
 536
 537         /* prepare zfcp_send_ct */
 538         ct->wka_port = &adapter->gs->ds;
 539         ct->handler = zfcp_fc_ns_handler;
 540         ct->handler_data = (unsigned long)&compl_rec;
 541         ct->timeout = 10;
 542         ct->req = &gpn_ft->sg_req;
 543         ct->resp = gpn_ft->sg_resp;
 544
 545         init_completion(&compl_rec.done);
 546         compl_rec.handler = NULL;
 547         ret = zfcp_fsf_send_ct(ct, NULL, NULL);
 548         if (!ret)
 549                 wait_for_completion(&compl_rec.done);
 550         return ret;
 551 }
 552
 553 static void zfcp_validate_port(struct zfcp_port *port)
 554 {
 555         struct zfcp_adapter *adapter = port->adapter;
 556
 557         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 558                 return;
 559
 560         atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
 561
 562         if ((port->supported_classes != 0) ||
 563             !list_empty(&port->unit_list_head)) {
 564                 zfcp_port_put(port);
 565                 return;
 566         }
 567         zfcp_erp_port_shutdown(port, 0, "fcpval1", NULL);
 568         zfcp_erp_wait(adapter);
 569         zfcp_port_put(port);
 570         zfcp_port_dequeue(port);
 571 }
 572
 573 static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft, int max_entries)
 574 {
 575         struct zfcp_send_ct *ct = &gpn_ft->ct;
 576         struct scatterlist *sg = gpn_ft->sg_resp;
 577         struct ct_hdr *hdr = sg_virt(sg);
 578         struct gpn_ft_resp_acc *acc = sg_virt(sg);
 579         struct zfcp_adapter *adapter = ct->wka_port->adapter;
 580         struct zfcp_port *port, *tmp;
 581         u32 d_id;
 582         int ret = 0, x, last = 0;
 583
 584         if (ct->status)
 585                 return -EIO;
 586
 587         if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
 588                 if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
 589                         return -EAGAIN; /* might be a temporary condition */
 590                 return -EIO;
 591         }
 592
 593         if (hdr->max_res_size) {
 594                 dev_warn(&adapter->ccw_device->dev,
 595                          "The name server reported %d words residual data\n",
 596                          hdr->max_res_size);
 597                 return -E2BIG;
 598         }
 599
 600         down(&zfcp_data.config_sema);
 601
 602         /* first entry is the header */
 603         for (x = 1; x < max_entries && !last; x++) {
 604                 if (x % (ZFCP_GPN_FT_ENTRIES + 1))
 605                         acc++;
 606                 else
 607                         acc = sg_virt(++sg);
 608
 609                 last = acc->control & 0x80;
 610                 d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 |
 611                        acc->port_id[2];
 612
 613                 /* don't attach ports with a well known address */
 614                 if ((d_id & ZFCP_DID_WKA) == ZFCP_DID_WKA)
 615                         continue;
 616                 /* skip the adapter's port and known remote ports */
 617                 if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
 618                         continue;
 619                 port = zfcp_get_port_by_wwpn(adapter, acc->wwpn);
 620                 if (port)
 621                         continue;
 622
 623                 port = zfcp_port_enqueue(adapter, acc->wwpn,
 624                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 625                 if (IS_ERR(port))
 626                         ret = PTR_ERR(port);
 627                 else
 628                         zfcp_erp_port_reopen(port, 0, "fcegpf1", NULL);
 629         }
 630
 631         zfcp_erp_wait(adapter);
 632         list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list)
 633                 zfcp_validate_port(port);
 634         up(&zfcp_data.config_sema);
 635         return ret;
 636 }
 637
 638 /**
 639  * zfcp_scan_ports - scan remote ports and attach new ports
 640  * @adapter: pointer to struct zfcp_adapter
 641  */
 642 int zfcp_scan_ports(struct zfcp_adapter *adapter)
 643 {
 644         int ret, i;
 645         struct zfcp_gpn_ft *gpn_ft;
 646         int chain, max_entries, buf_num, max_bytes;
 647
 648         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 649         buf_num = chain ? ZFCP_GPN_FT_BUFFERS : 1;
 650         max_entries = chain ? ZFCP_GPN_FT_MAX_ENTRIES : ZFCP_GPN_FT_ENTRIES;
 651         max_bytes = chain ? ZFCP_GPN_FT_MAX_SIZE : ZFCP_CT_SIZE_ONE_PAGE;
 652
 653         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 654             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 655                 return 0;
 656
 657         ret = zfcp_wka_port_get(&adapter->gs->ds);
 658         if (ret)
 659                 return ret;
 660
 661         gpn_ft = zfcp_alloc_sg_env(buf_num);
 662         if (!gpn_ft) {
 663                 ret = -ENOMEM;
 664                 goto out;
 665         }
 666
 667         for (i = 0; i < 3; i++) {
 668                 ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter, max_bytes);
 669                 if (!ret) {
 670                         ret = zfcp_scan_eval_gpn_ft(gpn_ft, max_entries);
 671                         if (ret == -EAGAIN)
 672                                 ssleep(1);
 673                         else
 674                                 break;
 675                 }
 676         }
 677         zfcp_free_sg_env(gpn_ft, buf_num);
 678 out:
 679         zfcp_wka_port_put(&adapter->gs->ds);
 680         return ret;
 681 }
 682
 683
 684 void _zfcp_scan_ports_later(struct work_struct *work)
 685 {
 686         zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work));
 687 }
 688
 689 struct zfcp_els_fc_job {
 690         struct zfcp_send_els els;
 691         struct fc_bsg_job *job;
 692 };
 693
 694 static void zfcp_fc_generic_els_handler(unsigned long data)
 695 {
 696         struct zfcp_els_fc_job *els_fc_job = (struct zfcp_els_fc_job *) data;
 697         struct fc_bsg_job *job = els_fc_job->job;
 698         struct fc_bsg_reply *reply = job->reply;
 699
 700         if (els_fc_job->els.status) {
 701                 /* request rejected or timed out */
 702                 reply->reply_data.ctels_reply.status = FC_CTELS_STATUS_REJECT;
 703                 goto out;
 704         }
 705
 706         reply->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
 707         reply->reply_payload_rcv_len = job->reply_payload.payload_len;
 708
 709 out:
 710         job->state_flags = FC_RQST_STATE_DONE;
 711         job->job_done(job);
 712         kfree(els_fc_job);
 713 }
 714
 715 int zfcp_fc_execute_els_fc_job(struct fc_bsg_job *job)
 716 {
 717         struct zfcp_els_fc_job *els_fc_job;
 718         struct fc_rport *rport = job->rport;
 719         struct Scsi_Host *shost;
 720         struct zfcp_adapter *adapter;
 721         struct zfcp_port *port;
 722         u8 *port_did;
 723
 724         shost = rport ? rport_to_shost(rport) : job->shost;
 725         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 726
 727         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
 728                 return -EINVAL;
 729
 730         els_fc_job = kzalloc(sizeof(struct zfcp_els_fc_job), GFP_KERNEL);
 731         if (!els_fc_job)
 732                 return -ENOMEM;
 733
 734         els_fc_job->els.adapter = adapter;
 735         if (rport) {
 736                 read_lock_irq(&zfcp_data.config_lock);
 737                 port = rport->dd_data;
 738                 if (port)
 739                         els_fc_job->els.d_id = port->d_id;
 740                 read_unlock_irq(&zfcp_data.config_lock);
 741                 if (!port) {
 742                         kfree(els_fc_job);
 743                         return -EINVAL;
 744                 }
 745         } else {
 746                 port_did = job->request->rqst_data.h_els.port_id;
 747                 els_fc_job->els.d_id = (port_did[0] << 16) +
 748                                         (port_did[1] << 8) + port_did[2];
 749         }
 750
 751         els_fc_job->els.req = job->request_payload.sg_list;
 752         els_fc_job->els.resp = job->reply_payload.sg_list;
 753         els_fc_job->els.handler = zfcp_fc_generic_els_handler;
 754         els_fc_job->els.handler_data = (unsigned long) els_fc_job;
 755         els_fc_job->job = job;
 756
 757         return zfcp_fsf_send_els(&els_fc_job->els);
 758 }
 759
 760 struct zfcp_ct_fc_job {
 761         struct zfcp_send_ct ct;
 762         struct fc_bsg_job *job;
 763 };
 764
 765 static void zfcp_fc_generic_ct_handler(unsigned long data)
 766 {
 767         struct zfcp_ct_fc_job *ct_fc_job = (struct zfcp_ct_fc_job *) data;
 768         struct fc_bsg_job *job = ct_fc_job->job;
 769
 770         job->reply->reply_data.ctels_reply.status = ct_fc_job->ct.status ?
 771                                 FC_CTELS_STATUS_REJECT : FC_CTELS_STATUS_OK;
 772         job->reply->reply_payload_rcv_len = job->reply_payload.payload_len;
 773         job->state_flags = FC_RQST_STATE_DONE;
 774         job->job_done(job);
 775
 776         zfcp_wka_port_put(ct_fc_job->ct.wka_port);
 777
 778         kfree(ct_fc_job);
 779 }
 780
 781 int zfcp_fc_execute_ct_fc_job(struct fc_bsg_job *job)
 782 {
 783         int ret;
 784         u8 gs_type;
 785         struct fc_rport *rport = job->rport;
 786         struct Scsi_Host *shost;
 787         struct zfcp_adapter *adapter;
 788         struct zfcp_ct_fc_job *ct_fc_job;
 789         u32 preamble_word1;
 790
 791         shost = rport ? rport_to_shost(rport) : job->shost;
 792
 793         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 794         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
 795                 return -EINVAL;
 796
 797         ct_fc_job = kzalloc(sizeof(struct zfcp_ct_fc_job), GFP_KERNEL);
 798         if (!ct_fc_job)
 799                 return -ENOMEM;
 800
 801         preamble_word1 = job->request->rqst_data.r_ct.preamble_word1;
 802         gs_type = (preamble_word1 & 0xff000000) >> 24;
 803
 804         switch (gs_type) {
 805         case FC_FST_ALIAS:
 806                 ct_fc_job->ct.wka_port = &adapter->gs->as;
 807                 break;
 808         case FC_FST_MGMT:
 809                 ct_fc_job->ct.wka_port = &adapter->gs->ms;
 810                 break;
 811         case FC_FST_TIME:
 812                 ct_fc_job->ct.wka_port = &adapter->gs->ts;
 813                 break;
 814         case FC_FST_DIR:
 815                 ct_fc_job->ct.wka_port = &adapter->gs->ds;
 816                 break;
 817         default:
 818                 kfree(ct_fc_job);
 819                 return -EINVAL; /* no such service */
 820         }
 821
 822         ret = zfcp_wka_port_get(ct_fc_job->ct.wka_port);
 823         if (ret) {
 824                 kfree(ct_fc_job);
 825                 return ret;
 826         }
 827
 828         ct_fc_job->ct.req = job->request_payload.sg_list;
 829         ct_fc_job->ct.resp = job->reply_payload.sg_list;
 830         ct_fc_job->ct.timeout = ZFCP_FSF_REQUEST_TIMEOUT;
 831         ct_fc_job->ct.handler = zfcp_fc_generic_ct_handler;
 832         ct_fc_job->ct.handler_data = (unsigned long) ct_fc_job;
 833         ct_fc_job->ct.completion = NULL;
 834         ct_fc_job->job = job;
 835
 836         ret = zfcp_fsf_send_ct(&ct_fc_job->ct, NULL, NULL);
 837         if (ret) {
 838                 kfree(ct_fc_job);
 839                 zfcp_wka_port_put(ct_fc_job->ct.wka_port);
 840         }
 841         return ret;
 842 }