SAFE public projects git trees. - safe/jmp/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 gpn_ft_resp_acc {
  29         u8 control;
  30         u8 port_id[3];
  31         u8 reserved[4];
  32         u64 wwpn;
  33 } __attribute__ ((packed));
  34
  35 #define ZFCP_CT_SIZE_ONE_PAGE   (PAGE_SIZE - sizeof(struct ct_hdr))
  36 #define ZFCP_GPN_FT_ENTRIES     (ZFCP_CT_SIZE_ONE_PAGE \
  37                                         / sizeof(struct gpn_ft_resp_acc))
  38 #define ZFCP_GPN_FT_BUFFERS 4
  39 #define ZFCP_GPN_FT_MAX_SIZE (ZFCP_GPN_FT_BUFFERS * PAGE_SIZE \
  40                                 - sizeof(struct ct_hdr))
  41 #define ZFCP_GPN_FT_MAX_ENTRIES ZFCP_GPN_FT_BUFFERS * (ZFCP_GPN_FT_ENTRIES + 1)
  42
  43 struct ct_iu_gpn_ft_resp {
  44         struct ct_hdr header;
  45         struct gpn_ft_resp_acc accept[ZFCP_GPN_FT_ENTRIES];
  46 } __attribute__ ((packed));
  47
  48 struct zfcp_gpn_ft {
  49         struct zfcp_send_ct ct;
  50         struct scatterlist sg_req;
  51         struct scatterlist sg_resp[ZFCP_GPN_FT_BUFFERS];
  52 };
  53
  54 struct zfcp_fc_ns_handler_data {
  55         struct completion done;
  56         void (*handler)(unsigned long);
  57         unsigned long handler_data;
  58 };
  59
  60 static int zfcp_wka_port_get(struct zfcp_wka_port *wka_port)
  61 {
  62         if (mutex_lock_interruptible(&wka_port->mutex))
  63                 return -ERESTARTSYS;
  64
  65         if (wka_port->status == ZFCP_WKA_PORT_OFFLINE ||
  66             wka_port->status == ZFCP_WKA_PORT_CLOSING) {
  67                 wka_port->status = ZFCP_WKA_PORT_OPENING;
  68                 if (zfcp_fsf_open_wka_port(wka_port))
  69                         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
  70         }
  71
  72         mutex_unlock(&wka_port->mutex);
  73
  74         wait_event(wka_port->completion_wq,
  75                    wka_port->status == ZFCP_WKA_PORT_ONLINE ||
  76                    wka_port->status == ZFCP_WKA_PORT_OFFLINE);
  77
  78         if (wka_port->status == ZFCP_WKA_PORT_ONLINE) {
  79                 atomic_inc(&wka_port->refcount);
  80                 return 0;
  81         }
  82         return -EIO;
  83 }
  84
  85 static void zfcp_wka_port_offline(struct work_struct *work)
  86 {
  87         struct delayed_work *dw = to_delayed_work(work);
  88         struct zfcp_wka_port *wka_port =
  89                         container_of(dw, struct zfcp_wka_port, work);
  90
  91         mutex_lock(&wka_port->mutex);
  92         if ((atomic_read(&wka_port->refcount) != 0) ||
  93             (wka_port->status != ZFCP_WKA_PORT_ONLINE))
  94                 goto out;
  95
  96         wka_port->status = ZFCP_WKA_PORT_CLOSING;
  97         if (zfcp_fsf_close_wka_port(wka_port)) {
  98                 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
  99                 wake_up(&wka_port->completion_wq);
 100         }
 101 out:
 102         mutex_unlock(&wka_port->mutex);
 103 }
 104
 105 static void zfcp_wka_port_put(struct zfcp_wka_port *wka_port)
 106 {
 107         if (atomic_dec_return(&wka_port->refcount) != 0)
 108                 return;
 109         /* wait 10 milliseconds, other reqs might pop in */
 110         schedule_delayed_work(&wka_port->work, HZ / 100);
 111 }
 112
 113 static void zfcp_fc_wka_port_init(struct zfcp_wka_port *wka_port, u32 d_id,
 114                                   struct zfcp_adapter *adapter)
 115 {
 116         init_waitqueue_head(&wka_port->completion_wq);
 117
 118         wka_port->adapter = adapter;
 119         wka_port->d_id = d_id;
 120
 121         wka_port->status = ZFCP_WKA_PORT_OFFLINE;
 122         atomic_set(&wka_port->refcount, 0);
 123         mutex_init(&wka_port->mutex);
 124         INIT_DELAYED_WORK(&wka_port->work, zfcp_wka_port_offline);
 125 }
 126
 127 static void zfcp_fc_wka_port_force_offline(struct zfcp_wka_port *wka)
 128 {
 129         cancel_delayed_work_sync(&wka->work);
 130         mutex_lock(&wka->mutex);
 131         wka->status = ZFCP_WKA_PORT_OFFLINE;
 132         mutex_unlock(&wka->mutex);
 133 }
 134
 135 void zfcp_fc_wka_ports_force_offline(struct zfcp_wka_ports *gs)
 136 {
 137         zfcp_fc_wka_port_force_offline(&gs->ms);
 138         zfcp_fc_wka_port_force_offline(&gs->ts);
 139         zfcp_fc_wka_port_force_offline(&gs->ds);
 140         zfcp_fc_wka_port_force_offline(&gs->as);
 141         zfcp_fc_wka_port_force_offline(&gs->ks);
 142 }
 143
 144 void zfcp_fc_wka_ports_init(struct zfcp_adapter *adapter)
 145 {
 146         struct zfcp_wka_ports *gs = adapter->gs;
 147
 148         zfcp_fc_wka_port_init(&gs->ms, FC_FID_MGMT_SERV, adapter);
 149         zfcp_fc_wka_port_init(&gs->ts, FC_FID_TIME_SERV, adapter);
 150         zfcp_fc_wka_port_init(&gs->ds, FC_FID_DIR_SERV, adapter);
 151         zfcp_fc_wka_port_init(&gs->as, FC_FID_ALIASES, adapter);
 152         zfcp_fc_wka_port_init(&gs->ks, FC_FID_SEC_KEY, adapter);
 153 }
 154
 155 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
 156                                    struct fcp_rscn_element *elem)
 157 {
 158         unsigned long flags;
 159         struct zfcp_port *port;
 160
 161         read_lock_irqsave(&zfcp_data.config_lock, flags);
 162         list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
 163                 if ((port->d_id & range) == (elem->nport_did & range))
 164                         zfcp_test_link(port);
 165                 if (!port->d_id)
 166                         zfcp_erp_port_reopen(port,
 167                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 168                                              "fcrscn1", NULL);
 169         }
 170
 171         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 172 }
 173
 174 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 175 {
 176         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 177         struct fcp_rscn_head *fcp_rscn_head;
 178         struct fcp_rscn_element *fcp_rscn_element;
 179         u16 i;
 180         u16 no_entries;
 181         u32 range_mask;
 182
 183         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload.data;
 184         fcp_rscn_element = (struct fcp_rscn_element *) fcp_rscn_head;
 185
 186         /* see FC-FS */
 187         no_entries = fcp_rscn_head->payload_len /
 188                         sizeof(struct fcp_rscn_element);
 189
 190         for (i = 1; i < no_entries; i++) {
 191                 /* skip head and start with 1st element */
 192                 fcp_rscn_element++;
 193                 range_mask = rscn_range_mask[fcp_rscn_element->addr_format];
 194                 _zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
 195         }
 196         schedule_work(&fsf_req->adapter->scan_work);
 197 }
 198
 199 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 200 {
 201         struct zfcp_adapter *adapter = req->adapter;
 202         struct zfcp_port *port;
 203         unsigned long flags;
 204
 205         read_lock_irqsave(&zfcp_data.config_lock, flags);
 206         list_for_each_entry(port, &adapter->port_list_head, list)
 207                 if (port->wwpn == wwpn)
 208                         break;
 209         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 210
 211         if (port && (port->wwpn == wwpn))
 212                 zfcp_erp_port_forced_reopen(port, 0, "fciwwp1", req);
 213 }
 214
 215 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 216 {
 217         struct fsf_status_read_buffer *status_buffer =
 218                 (struct fsf_status_read_buffer *)req->data;
 219         struct fsf_plogi *els_plogi =
 220                 (struct fsf_plogi *) status_buffer->payload.data;
 221
 222         zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
 223 }
 224
 225 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 226 {
 227         struct fsf_status_read_buffer *status_buffer =
 228                 (struct fsf_status_read_buffer *)req->data;
 229         struct fcp_logo *els_logo =
 230                 (struct fcp_logo *) status_buffer->payload.data;
 231
 232         zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
 233 }
 234
 235 /**
 236  * zfcp_fc_incoming_els - handle incoming ELS
 237  * @fsf_req - request which contains incoming ELS
 238  */
 239 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 240 {
 241         struct fsf_status_read_buffer *status_buffer =
 242                 (struct fsf_status_read_buffer *) fsf_req->data;
 243         unsigned int els_type = status_buffer->payload.data[0];
 244
 245         zfcp_san_dbf_event_incoming_els(fsf_req);
 246         if (els_type == LS_PLOGI)
 247                 zfcp_fc_incoming_plogi(fsf_req);
 248         else if (els_type == LS_LOGO)
 249                 zfcp_fc_incoming_logo(fsf_req);
 250         else if (els_type == LS_RSCN)
 251                 zfcp_fc_incoming_rscn(fsf_req);
 252 }
 253
 254 static void zfcp_fc_ns_handler(unsigned long data)
 255 {
 256         struct zfcp_fc_ns_handler_data *compl_rec =
 257                         (struct zfcp_fc_ns_handler_data *) data;
 258
 259         if (compl_rec->handler)
 260                 compl_rec->handler(compl_rec->handler_data);
 261
 262         complete(&compl_rec->done);
 263 }
 264
 265 static void zfcp_fc_ns_gid_pn_eval(unsigned long data)
 266 {
 267         struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data;
 268         struct zfcp_send_ct *ct = &gid_pn->ct;
 269         struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
 270         struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
 271         struct zfcp_port *port = gid_pn->port;
 272
 273         if (ct->status)
 274                 return;
 275         if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT)
 276                 return;
 277
 278         /* paranoia */
 279         if (ct_iu_req->wwpn != port->wwpn)
 280                 return;
 281         /* looks like a valid d_id */
 282         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
 283 }
 284
 285 int static zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action,
 286                                      struct zfcp_gid_pn_data *gid_pn)
 287 {
 288         struct zfcp_adapter *adapter = erp_action->adapter;
 289         struct zfcp_fc_ns_handler_data compl_rec;
 290         int ret;
 291
 292         /* setup parameters for send generic command */
 293         gid_pn->port = erp_action->port;
 294         gid_pn->ct.wka_port = &adapter->gs->ds;
 295         gid_pn->ct.handler = zfcp_fc_ns_handler;
 296         gid_pn->ct.handler_data = (unsigned long) &compl_rec;
 297         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
 298         gid_pn->ct.req = &gid_pn->req;
 299         gid_pn->ct.resp = &gid_pn->resp;
 300         sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
 301                     sizeof(struct ct_iu_gid_pn_req));
 302         sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
 303                     sizeof(struct ct_iu_gid_pn_resp));
 304
 305         /* setup nameserver request */
 306         gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
 307         gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 308         gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
 309         gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
 310         gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
 311         gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_SIZE_ONE_PAGE / 4;
 312         gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
 313
 314         init_completion(&compl_rec.done);
 315         compl_rec.handler = zfcp_fc_ns_gid_pn_eval;
 316         compl_rec.handler_data = (unsigned long) gid_pn;
 317         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.erp_req, erp_action);
 318         if (!ret)
 319                 wait_for_completion(&compl_rec.done);
 320         return ret;
 321 }
 322
 323 /**
 324  * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
 325  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
 326  * return: -ENOMEM on error, 0 otherwise
 327  */
 328 int zfcp_fc_ns_gid_pn(struct zfcp_erp_action *erp_action)
 329 {
 330         int ret;
 331         struct zfcp_gid_pn_data *gid_pn;
 332         struct zfcp_adapter *adapter = erp_action->adapter;
 333
 334         gid_pn = mempool_alloc(adapter->pool.gid_pn_data, GFP_ATOMIC);
 335         if (!gid_pn)
 336                 return -ENOMEM;
 337
 338         memset(gid_pn, 0, sizeof(*gid_pn));
 339
 340         ret = zfcp_wka_port_get(&adapter->gs->ds);
 341         if (ret)
 342                 goto out;
 343
 344         ret = zfcp_fc_ns_gid_pn_request(erp_action, gid_pn);
 345
 346         zfcp_wka_port_put(&adapter->gs->ds);
 347 out:
 348         mempool_free(gid_pn, adapter->pool.gid_pn_data);
 349         return ret;
 350 }
 351
 352 /**
 353  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 354  * @port: zfcp_port structure
 355  * @plogi: plogi payload
 356  *
 357  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 358  */
 359 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
 360 {
 361         port->maxframe_size = plogi->serv_param.common_serv_param[7] |
 362                 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
 363         if (plogi->serv_param.class1_serv_param[0] & 0x80)
 364                 port->supported_classes |= FC_COS_CLASS1;
 365         if (plogi->serv_param.class2_serv_param[0] & 0x80)
 366                 port->supported_classes |= FC_COS_CLASS2;
 367         if (plogi->serv_param.class3_serv_param[0] & 0x80)
 368                 port->supported_classes |= FC_COS_CLASS3;
 369         if (plogi->serv_param.class4_serv_param[0] & 0x80)
 370                 port->supported_classes |= FC_COS_CLASS4;
 371 }
 372
 373 struct zfcp_els_adisc {
 374         struct zfcp_send_els els;
 375         struct scatterlist req;
 376         struct scatterlist resp;
 377         struct zfcp_ls_adisc ls_adisc;
 378         struct zfcp_ls_adisc ls_adisc_acc;
 379 };
 380
 381 static void zfcp_fc_adisc_handler(unsigned long data)
 382 {
 383         struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data;
 384         struct zfcp_port *port = adisc->els.port;
 385         struct zfcp_ls_adisc *ls_adisc = &adisc->ls_adisc_acc;
 386
 387         if (adisc->els.status) {
 388                 /* request rejected or timed out */
 389                 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 390                                             "fcadh_1", NULL);
 391                 goto out;
 392         }
 393
 394         if (!port->wwnn)
 395                 port->wwnn = ls_adisc->wwnn;
 396
 397         if ((port->wwpn != ls_adisc->wwpn) ||
 398             !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 399                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 400                                      "fcadh_2", NULL);
 401                 goto out;
 402         }
 403
 404         /* port is good, unblock rport without going through erp */
 405         zfcp_scsi_schedule_rport_register(port);
 406  out:
 407         atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 408         zfcp_port_put(port);
 409         kfree(adisc);
 410 }
 411
 412 static int zfcp_fc_adisc(struct zfcp_port *port)
 413 {
 414         struct zfcp_els_adisc *adisc;
 415         struct zfcp_adapter *adapter = port->adapter;
 416
 417         adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
 418         if (!adisc)
 419                 return -ENOMEM;
 420
 421         adisc->els.req = &adisc->req;
 422         adisc->els.resp = &adisc->resp;
 423         sg_init_one(adisc->els.req, &adisc->ls_adisc,
 424                     sizeof(struct zfcp_ls_adisc));
 425         sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
 426                     sizeof(struct zfcp_ls_adisc));
 427
 428         adisc->els.adapter = adapter;
 429         adisc->els.port = port;
 430         adisc->els.d_id = port->d_id;
 431         adisc->els.handler = zfcp_fc_adisc_handler;
 432         adisc->els.handler_data = (unsigned long) adisc;
 433         adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
 434
 435         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 436            without FC-AL-2 capability, so we don't set it */
 437         adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
 438         adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
 439         adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
 440
 441         return zfcp_fsf_send_els(&adisc->els);
 442 }
 443
 444 void zfcp_fc_link_test_work(struct work_struct *work)
 445 {
 446         struct zfcp_port *port =
 447                 container_of(work, struct zfcp_port, test_link_work);
 448         int retval;
 449
 450         zfcp_port_get(port);
 451         port->rport_task = RPORT_DEL;
 452         zfcp_scsi_rport_work(&port->rport_work);
 453
 454         /* only issue one test command at one time per port */
 455         if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
 456                 goto out;
 457
 458         atomic_set_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 459
 460         retval = zfcp_fc_adisc(port);
 461         if (retval == 0)
 462                 return;
 463
 464         /* send of ADISC was not possible */
 465         atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 466         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1", NULL);
 467
 468 out:
 469         zfcp_port_put(port);
 470 }
 471
 472 /**
 473  * zfcp_test_link - lightweight link test procedure
 474  * @port: port to be tested
 475  *
 476  * Test status of a link to a remote port using the ELS command ADISC.
 477  * If there is a problem with the remote port, error recovery steps
 478  * will be triggered.
 479  */
 480 void zfcp_test_link(struct zfcp_port *port)
 481 {
 482         zfcp_port_get(port);
 483         if (!queue_work(zfcp_data.work_queue, &port->test_link_work))
 484                 zfcp_port_put(port);
 485 }
 486
 487 static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft, int buf_num)
 488 {
 489         struct scatterlist *sg = &gpn_ft->sg_req;
 490
 491         kmem_cache_free(zfcp_data.gpn_ft_cache, sg_virt(sg));
 492         zfcp_sg_free_table(gpn_ft->sg_resp, buf_num);
 493
 494         kfree(gpn_ft);
 495 }
 496
 497 static struct zfcp_gpn_ft *zfcp_alloc_sg_env(int buf_num)
 498 {
 499         struct zfcp_gpn_ft *gpn_ft;
 500         struct ct_iu_gpn_ft_req *req;
 501
 502         gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
 503         if (!gpn_ft)
 504                 return NULL;
 505
 506         req = kmem_cache_alloc(zfcp_data.gpn_ft_cache, GFP_KERNEL);
 507         if (!req) {
 508                 kfree(gpn_ft);
 509                 gpn_ft = NULL;
 510                 goto out;
 511         }
 512         sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
 513
 514         if (zfcp_sg_setup_table(gpn_ft->sg_resp, buf_num)) {
 515                 zfcp_free_sg_env(gpn_ft, buf_num);
 516                 gpn_ft = NULL;
 517         }
 518 out:
 519         return gpn_ft;
 520 }
 521
 522
 523 static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
 524                                   struct zfcp_adapter *adapter,
 525                                   int max_bytes)
 526 {
 527         struct zfcp_send_ct *ct = &gpn_ft->ct;
 528         struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
 529         struct zfcp_fc_ns_handler_data compl_rec;
 530         int ret;
 531
 532         /* prepare CT IU for GPN_FT */
 533         req->header.revision = ZFCP_CT_REVISION;
 534         req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 535         req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
 536         req->header.options = ZFCP_CT_SYNCHRONOUS;
 537         req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
 538         req->header.max_res_size = max_bytes / 4;
 539         req->flags = 0;
 540         req->domain_id_scope = 0;
 541         req->area_id_scope = 0;
 542         req->fc4_type = ZFCP_CT_SCSI_FCP;
 543
 544         /* prepare zfcp_send_ct */
 545         ct->wka_port = &adapter->gs->ds;
 546         ct->handler = zfcp_fc_ns_handler;
 547         ct->handler_data = (unsigned long)&compl_rec;
 548         ct->timeout = 10;
 549         ct->req = &gpn_ft->sg_req;
 550         ct->resp = gpn_ft->sg_resp;
 551
 552         init_completion(&compl_rec.done);
 553         compl_rec.handler = NULL;
 554         ret = zfcp_fsf_send_ct(ct, NULL, NULL);
 555         if (!ret)
 556                 wait_for_completion(&compl_rec.done);
 557         return ret;
 558 }
 559
 560 static void zfcp_validate_port(struct zfcp_port *port)
 561 {
 562         struct zfcp_adapter *adapter = port->adapter;
 563
 564         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 565                 return;
 566
 567         atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
 568
 569         if ((port->supported_classes != 0) ||
 570             !list_empty(&port->unit_list_head)) {
 571                 zfcp_port_put(port);
 572                 return;
 573         }
 574         zfcp_erp_port_shutdown(port, 0, "fcpval1", NULL);
 575         zfcp_erp_wait(adapter);
 576         zfcp_port_put(port);
 577         zfcp_port_dequeue(port);
 578 }
 579
 580 static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft, int max_entries)
 581 {
 582         struct zfcp_send_ct *ct = &gpn_ft->ct;
 583         struct scatterlist *sg = gpn_ft->sg_resp;
 584         struct ct_hdr *hdr = sg_virt(sg);
 585         struct gpn_ft_resp_acc *acc = sg_virt(sg);
 586         struct zfcp_adapter *adapter = ct->wka_port->adapter;
 587         struct zfcp_port *port, *tmp;
 588         u32 d_id;
 589         int ret = 0, x, last = 0;
 590
 591         if (ct->status)
 592                 return -EIO;
 593
 594         if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
 595                 if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
 596                         return -EAGAIN; /* might be a temporary condition */
 597                 return -EIO;
 598         }
 599
 600         if (hdr->max_res_size) {
 601                 dev_warn(&adapter->ccw_device->dev,
 602                          "The name server reported %d words residual data\n",
 603                          hdr->max_res_size);
 604                 return -E2BIG;
 605         }
 606
 607         down(&zfcp_data.config_sema);
 608
 609         /* first entry is the header */
 610         for (x = 1; x < max_entries && !last; x++) {
 611                 if (x % (ZFCP_GPN_FT_ENTRIES + 1))
 612                         acc++;
 613                 else
 614                         acc = sg_virt(++sg);
 615
 616                 last = acc->control & 0x80;
 617                 d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 |
 618                        acc->port_id[2];
 619
 620                 /* don't attach ports with a well known address */
 621                 if ((d_id & ZFCP_DID_WKA) == ZFCP_DID_WKA)
 622                         continue;
 623                 /* skip the adapter's port and known remote ports */
 624                 if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
 625                         continue;
 626                 port = zfcp_get_port_by_wwpn(adapter, acc->wwpn);
 627                 if (port)
 628                         continue;
 629
 630                 port = zfcp_port_enqueue(adapter, acc->wwpn,
 631                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 632                 if (IS_ERR(port))
 633                         ret = PTR_ERR(port);
 634                 else
 635                         zfcp_erp_port_reopen(port, 0, "fcegpf1", NULL);
 636         }
 637
 638         zfcp_erp_wait(adapter);
 639         list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list)
 640                 zfcp_validate_port(port);
 641         up(&zfcp_data.config_sema);
 642         return ret;
 643 }
 644
 645 /**
 646  * zfcp_scan_ports - scan remote ports and attach new ports
 647  * @adapter: pointer to struct zfcp_adapter
 648  */
 649 int zfcp_scan_ports(struct zfcp_adapter *adapter)
 650 {
 651         int ret, i;
 652         struct zfcp_gpn_ft *gpn_ft;
 653         int chain, max_entries, buf_num, max_bytes;
 654
 655         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 656         buf_num = chain ? ZFCP_GPN_FT_BUFFERS : 1;
 657         max_entries = chain ? ZFCP_GPN_FT_MAX_ENTRIES : ZFCP_GPN_FT_ENTRIES;
 658         max_bytes = chain ? ZFCP_GPN_FT_MAX_SIZE : ZFCP_CT_SIZE_ONE_PAGE;
 659
 660         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 661             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 662                 return 0;
 663
 664         ret = zfcp_wka_port_get(&adapter->gs->ds);
 665         if (ret)
 666                 return ret;
 667
 668         gpn_ft = zfcp_alloc_sg_env(buf_num);
 669         if (!gpn_ft) {
 670                 ret = -ENOMEM;
 671                 goto out;
 672         }
 673
 674         for (i = 0; i < 3; i++) {
 675                 ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter, max_bytes);
 676                 if (!ret) {
 677                         ret = zfcp_scan_eval_gpn_ft(gpn_ft, max_entries);
 678                         if (ret == -EAGAIN)
 679                                 ssleep(1);
 680                         else
 681                                 break;
 682                 }
 683         }
 684         zfcp_free_sg_env(gpn_ft, buf_num);
 685 out:
 686         zfcp_wka_port_put(&adapter->gs->ds);
 687         return ret;
 688 }
 689
 690
 691 void _zfcp_scan_ports_later(struct work_struct *work)
 692 {
 693         zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work));
 694 }
 695
 696 struct zfcp_els_fc_job {
 697         struct zfcp_send_els els;
 698         struct fc_bsg_job *job;
 699 };
 700
 701 static void zfcp_fc_generic_els_handler(unsigned long data)
 702 {
 703         struct zfcp_els_fc_job *els_fc_job = (struct zfcp_els_fc_job *) data;
 704         struct fc_bsg_job *job = els_fc_job->job;
 705         struct fc_bsg_reply *reply = job->reply;
 706
 707         if (els_fc_job->els.status) {
 708                 /* request rejected or timed out */
 709                 reply->reply_data.ctels_reply.status = FC_CTELS_STATUS_REJECT;
 710                 goto out;
 711         }
 712
 713         reply->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
 714         reply->reply_payload_rcv_len = job->reply_payload.payload_len;
 715
 716 out:
 717         job->state_flags = FC_RQST_STATE_DONE;
 718         job->job_done(job);
 719         kfree(els_fc_job);
 720 }
 721
 722 int zfcp_fc_execute_els_fc_job(struct fc_bsg_job *job)
 723 {
 724         struct zfcp_els_fc_job *els_fc_job;
 725         struct fc_rport *rport = job->rport;
 726         struct Scsi_Host *shost;
 727         struct zfcp_adapter *adapter;
 728         struct zfcp_port *port;
 729         u8 *port_did;
 730
 731         shost = rport ? rport_to_shost(rport) : job->shost;
 732         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 733
 734         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
 735                 return -EINVAL;
 736
 737         els_fc_job = kzalloc(sizeof(struct zfcp_els_fc_job), GFP_KERNEL);
 738         if (!els_fc_job)
 739                 return -ENOMEM;
 740
 741         els_fc_job->els.adapter = adapter;
 742         if (rport) {
 743                 read_lock_irq(&zfcp_data.config_lock);
 744                 port = rport->dd_data;
 745                 if (port)
 746                         els_fc_job->els.d_id = port->d_id;
 747                 read_unlock_irq(&zfcp_data.config_lock);
 748                 if (!port) {
 749                         kfree(els_fc_job);
 750                         return -EINVAL;
 751                 }
 752         } else {
 753                 port_did = job->request->rqst_data.h_els.port_id;
 754                 els_fc_job->els.d_id = (port_did[0] << 16) +
 755                                         (port_did[1] << 8) + port_did[2];
 756         }
 757
 758         els_fc_job->els.req = job->request_payload.sg_list;
 759         els_fc_job->els.resp = job->reply_payload.sg_list;
 760         els_fc_job->els.handler = zfcp_fc_generic_els_handler;
 761         els_fc_job->els.handler_data = (unsigned long) els_fc_job;
 762         els_fc_job->job = job;
 763
 764         return zfcp_fsf_send_els(&els_fc_job->els);
 765 }
 766
 767 struct zfcp_ct_fc_job {
 768         struct zfcp_send_ct ct;
 769         struct fc_bsg_job *job;
 770 };
 771
 772 static void zfcp_fc_generic_ct_handler(unsigned long data)
 773 {
 774         struct zfcp_ct_fc_job *ct_fc_job = (struct zfcp_ct_fc_job *) data;
 775         struct fc_bsg_job *job = ct_fc_job->job;
 776
 777         job->reply->reply_data.ctels_reply.status = ct_fc_job->ct.status ?
 778                                 FC_CTELS_STATUS_REJECT : FC_CTELS_STATUS_OK;
 779         job->reply->reply_payload_rcv_len = job->reply_payload.payload_len;
 780         job->state_flags = FC_RQST_STATE_DONE;
 781         job->job_done(job);
 782
 783         zfcp_wka_port_put(ct_fc_job->ct.wka_port);
 784
 785         kfree(ct_fc_job);
 786 }
 787
 788 int zfcp_fc_execute_ct_fc_job(struct fc_bsg_job *job)
 789 {
 790         int ret;
 791         u8 gs_type;
 792         struct fc_rport *rport = job->rport;
 793         struct Scsi_Host *shost;
 794         struct zfcp_adapter *adapter;
 795         struct zfcp_ct_fc_job *ct_fc_job;
 796         u32 preamble_word1;
 797
 798         shost = rport ? rport_to_shost(rport) : job->shost;
 799
 800         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 801         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
 802                 return -EINVAL;
 803
 804         ct_fc_job = kzalloc(sizeof(struct zfcp_ct_fc_job), GFP_KERNEL);
 805         if (!ct_fc_job)
 806                 return -ENOMEM;
 807
 808         preamble_word1 = job->request->rqst_data.r_ct.preamble_word1;
 809         gs_type = (preamble_word1 & 0xff000000) >> 24;
 810
 811         switch (gs_type) {
 812         case FC_FST_ALIAS:
 813                 ct_fc_job->ct.wka_port = &adapter->gs->as;
 814                 break;
 815         case FC_FST_MGMT:
 816                 ct_fc_job->ct.wka_port = &adapter->gs->ms;
 817                 break;
 818         case FC_FST_TIME:
 819                 ct_fc_job->ct.wka_port = &adapter->gs->ts;
 820                 break;
 821         case FC_FST_DIR:
 822                 ct_fc_job->ct.wka_port = &adapter->gs->ds;
 823                 break;
 824         default:
 825                 kfree(ct_fc_job);
 826                 return -EINVAL; /* no such service */
 827         }
 828
 829         ret = zfcp_wka_port_get(ct_fc_job->ct.wka_port);
 830         if (ret) {
 831                 kfree(ct_fc_job);
 832                 return ret;
 833         }
 834
 835         ct_fc_job->ct.req = job->request_payload.sg_list;
 836         ct_fc_job->ct.resp = job->reply_payload.sg_list;
 837         ct_fc_job->ct.timeout = ZFCP_FSF_REQUEST_TIMEOUT;
 838         ct_fc_job->ct.handler = zfcp_fc_generic_ct_handler;
 839         ct_fc_job->ct.handler_data = (unsigned long) ct_fc_job;
 840         ct_fc_job->ct.completion = NULL;
 841         ct_fc_job->job = job;
 842
 843         ret = zfcp_fsf_send_ct(&ct_fc_job->ct, NULL, NULL);
 844         if (ret) {
 845                 kfree(ct_fc_job);
 846                 zfcp_wka_port_put(ct_fc_job->ct.wka_port);
 847         }
 848         return ret;
 849 }