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_fc_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_fc_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_fc_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_fc_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         if (!gs)
 138                 return;
 139         zfcp_fc_wka_port_force_offline(&gs->ms);
 140         zfcp_fc_wka_port_force_offline(&gs->ts);
 141         zfcp_fc_wka_port_force_offline(&gs->ds);
 142         zfcp_fc_wka_port_force_offline(&gs->as);
 143         zfcp_fc_wka_port_force_offline(&gs->ks);
 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_adapter *adapter = fsf_req->adapter;
 151         struct zfcp_port *port;
 152
 153         read_lock_irqsave(&adapter->port_list_lock, flags);
 154         list_for_each_entry(port, &adapter->port_list, list) {
 155                 if ((port->d_id & range) == (elem->nport_did & range))
 156                         zfcp_fc_test_link(port);
 157                 if (!port->d_id)
 158                         zfcp_erp_port_reopen(port,
 159                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 160                                              "fcrscn1", NULL);
 161         }
 162         read_unlock_irqrestore(&adapter->port_list_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         queue_work(fsf_req->adapter->work_queue, &fsf_req->adapter->scan_work);
 188 }
 189
 190 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 191 {
 192         unsigned long flags;
 193         struct zfcp_adapter *adapter = req->adapter;
 194         struct zfcp_port *port;
 195
 196         read_lock_irqsave(&adapter->port_list_lock, flags);
 197         list_for_each_entry(port, &adapter->port_list, list)
 198                 if (port->wwpn == wwpn) {
 199                         zfcp_erp_port_forced_reopen(port, 0, "fciwwp1", req);
 200                         break;
 201                 }
 202         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 203 }
 204
 205 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 206 {
 207         struct fsf_status_read_buffer *status_buffer =
 208                 (struct fsf_status_read_buffer *)req->data;
 209         struct fsf_plogi *els_plogi =
 210                 (struct fsf_plogi *) status_buffer->payload.data;
 211
 212         zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
 213 }
 214
 215 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 216 {
 217         struct fsf_status_read_buffer *status_buffer =
 218                 (struct fsf_status_read_buffer *)req->data;
 219         struct fcp_logo *els_logo =
 220                 (struct fcp_logo *) status_buffer->payload.data;
 221
 222         zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
 223 }
 224
 225 /**
 226  * zfcp_fc_incoming_els - handle incoming ELS
 227  * @fsf_req - request which contains incoming ELS
 228  */
 229 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 230 {
 231         struct fsf_status_read_buffer *status_buffer =
 232                 (struct fsf_status_read_buffer *) fsf_req->data;
 233         unsigned int els_type = status_buffer->payload.data[0];
 234
 235         zfcp_dbf_san_incoming_els(fsf_req);
 236         if (els_type == LS_PLOGI)
 237                 zfcp_fc_incoming_plogi(fsf_req);
 238         else if (els_type == LS_LOGO)
 239                 zfcp_fc_incoming_logo(fsf_req);
 240         else if (els_type == LS_RSCN)
 241                 zfcp_fc_incoming_rscn(fsf_req);
 242 }
 243
 244 static void zfcp_fc_ns_handler(unsigned long data)
 245 {
 246         struct zfcp_fc_ns_handler_data *compl_rec =
 247                         (struct zfcp_fc_ns_handler_data *) data;
 248
 249         if (compl_rec->handler)
 250                 compl_rec->handler(compl_rec->handler_data);
 251
 252         complete(&compl_rec->done);
 253 }
 254
 255 static void zfcp_fc_ns_gid_pn_eval(unsigned long data)
 256 {
 257         struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data;
 258         struct zfcp_send_ct *ct = &gid_pn->ct;
 259         struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
 260         struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
 261         struct zfcp_port *port = gid_pn->port;
 262
 263         if (ct->status)
 264                 return;
 265         if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT)
 266                 return;
 267
 268         /* paranoia */
 269         if (ct_iu_req->wwpn != port->wwpn)
 270                 return;
 271         /* looks like a valid d_id */
 272         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
 273 }
 274
 275 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
 276                                      struct zfcp_gid_pn_data *gid_pn)
 277 {
 278         struct zfcp_adapter *adapter = port->adapter;
 279         struct zfcp_fc_ns_handler_data compl_rec;
 280         int ret;
 281
 282         /* setup parameters for send generic command */
 283         gid_pn->port = port;
 284         gid_pn->ct.wka_port = &adapter->gs->ds;
 285         gid_pn->ct.handler = zfcp_fc_ns_handler;
 286         gid_pn->ct.handler_data = (unsigned long) &compl_rec;
 287         gid_pn->ct.req = &gid_pn->req;
 288         gid_pn->ct.resp = &gid_pn->resp;
 289         sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
 290                     sizeof(struct ct_iu_gid_pn_req));
 291         sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
 292                     sizeof(struct ct_iu_gid_pn_resp));
 293
 294         /* setup nameserver request */
 295         gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
 296         gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 297         gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
 298         gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
 299         gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
 300         gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_SIZE_ONE_PAGE / 4;
 301         gid_pn->ct_iu_req.wwpn = port->wwpn;
 302
 303         init_completion(&compl_rec.done);
 304         compl_rec.handler = zfcp_fc_ns_gid_pn_eval;
 305         compl_rec.handler_data = (unsigned long) gid_pn;
 306         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.gid_pn_req);
 307         if (!ret)
 308                 wait_for_completion(&compl_rec.done);
 309         return ret;
 310 }
 311
 312 /**
 313  * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
 314  * @port: port where GID_PN request is needed
 315  * return: -ENOMEM on error, 0 otherwise
 316  */
 317 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
 318 {
 319         int ret;
 320         struct zfcp_gid_pn_data *gid_pn;
 321         struct zfcp_adapter *adapter = port->adapter;
 322
 323         gid_pn = mempool_alloc(adapter->pool.gid_pn_data, GFP_ATOMIC);
 324         if (!gid_pn)
 325                 return -ENOMEM;
 326
 327         memset(gid_pn, 0, sizeof(*gid_pn));
 328
 329         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 330         if (ret)
 331                 goto out;
 332
 333         ret = zfcp_fc_ns_gid_pn_request(port, gid_pn);
 334
 335         zfcp_fc_wka_port_put(&adapter->gs->ds);
 336 out:
 337         mempool_free(gid_pn, adapter->pool.gid_pn_data);
 338         return ret;
 339 }
 340
 341 void zfcp_fc_port_did_lookup(struct work_struct *work)
 342 {
 343         int ret;
 344         struct zfcp_port *port = container_of(work, struct zfcp_port,
 345                                               gid_pn_work);
 346
 347         ret = zfcp_fc_ns_gid_pn(port);
 348         if (ret) {
 349                 /* could not issue gid_pn for some reason */
 350                 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1", NULL);
 351                 goto out;
 352         }
 353
 354         if (!port->d_id) {
 355                 zfcp_erp_port_failed(port, "fcgpn_2", NULL);
 356                 goto out;
 357         }
 358
 359         zfcp_erp_port_reopen(port, 0, "fcgpn_3", NULL);
 360 out:
 361         put_device(&port->sysfs_device);
 362 }
 363
 364 /**
 365  * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request
 366  * @port: The zfcp_port to lookup the d_id for.
 367  */
 368 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)
 369 {
 370         get_device(&port->sysfs_device);
 371         if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))
 372                 put_device(&port->sysfs_device);
 373 }
 374
 375 /**
 376  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 377  * @port: zfcp_port structure
 378  * @plogi: plogi payload
 379  *
 380  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 381  */
 382 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
 383 {
 384         port->maxframe_size = plogi->serv_param.common_serv_param[7] |
 385                 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
 386         if (plogi->serv_param.class1_serv_param[0] & 0x80)
 387                 port->supported_classes |= FC_COS_CLASS1;
 388         if (plogi->serv_param.class2_serv_param[0] & 0x80)
 389                 port->supported_classes |= FC_COS_CLASS2;
 390         if (plogi->serv_param.class3_serv_param[0] & 0x80)
 391                 port->supported_classes |= FC_COS_CLASS3;
 392         if (plogi->serv_param.class4_serv_param[0] & 0x80)
 393                 port->supported_classes |= FC_COS_CLASS4;
 394 }
 395
 396 struct zfcp_els_adisc {
 397         struct zfcp_send_els els;
 398         struct scatterlist req;
 399         struct scatterlist resp;
 400         struct zfcp_ls_adisc ls_adisc;
 401         struct zfcp_ls_adisc ls_adisc_acc;
 402 };
 403
 404 static void zfcp_fc_adisc_handler(unsigned long data)
 405 {
 406         struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data;
 407         struct zfcp_port *port = adisc->els.port;
 408         struct zfcp_ls_adisc *ls_adisc = &adisc->ls_adisc_acc;
 409
 410         if (adisc->els.status) {
 411                 /* request rejected or timed out */
 412                 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 413                                             "fcadh_1", NULL);
 414                 goto out;
 415         }
 416
 417         if (!port->wwnn)
 418                 port->wwnn = ls_adisc->wwnn;
 419
 420         if ((port->wwpn != ls_adisc->wwpn) ||
 421             !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 422                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 423                                      "fcadh_2", NULL);
 424                 goto out;
 425         }
 426
 427         /* port is good, unblock rport without going through erp */
 428         zfcp_scsi_schedule_rport_register(port);
 429  out:
 430         atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 431         put_device(&port->sysfs_device);
 432         kfree(adisc);
 433 }
 434
 435 static int zfcp_fc_adisc(struct zfcp_port *port)
 436 {
 437         struct zfcp_els_adisc *adisc;
 438         struct zfcp_adapter *adapter = port->adapter;
 439
 440         adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
 441         if (!adisc)
 442                 return -ENOMEM;
 443
 444         adisc->els.req = &adisc->req;
 445         adisc->els.resp = &adisc->resp;
 446         sg_init_one(adisc->els.req, &adisc->ls_adisc,
 447                     sizeof(struct zfcp_ls_adisc));
 448         sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
 449                     sizeof(struct zfcp_ls_adisc));
 450
 451         adisc->els.adapter = adapter;
 452         adisc->els.port = port;
 453         adisc->els.d_id = port->d_id;
 454         adisc->els.handler = zfcp_fc_adisc_handler;
 455         adisc->els.handler_data = (unsigned long) adisc;
 456         adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
 457
 458         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 459            without FC-AL-2 capability, so we don't set it */
 460         adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
 461         adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
 462         adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
 463
 464         return zfcp_fsf_send_els(&adisc->els);
 465 }
 466
 467 void zfcp_fc_link_test_work(struct work_struct *work)
 468 {
 469         struct zfcp_port *port =
 470                 container_of(work, struct zfcp_port, test_link_work);
 471         int retval;
 472
 473         get_device(&port->sysfs_device);
 474         port->rport_task = RPORT_DEL;
 475         zfcp_scsi_rport_work(&port->rport_work);
 476
 477         /* only issue one test command at one time per port */
 478         if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
 479                 goto out;
 480
 481         atomic_set_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 482
 483         retval = zfcp_fc_adisc(port);
 484         if (retval == 0)
 485                 return;
 486
 487         /* send of ADISC was not possible */
 488         atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 489         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1", NULL);
 490
 491 out:
 492         put_device(&port->sysfs_device);
 493 }
 494
 495 /**
 496  * zfcp_fc_test_link - lightweight link test procedure
 497  * @port: port to be tested
 498  *
 499  * Test status of a link to a remote port using the ELS command ADISC.
 500  * If there is a problem with the remote port, error recovery steps
 501  * will be triggered.
 502  */
 503 void zfcp_fc_test_link(struct zfcp_port *port)
 504 {
 505         get_device(&port->sysfs_device);
 506         if (!queue_work(port->adapter->work_queue, &port->test_link_work))
 507                 put_device(&port->sysfs_device);
 508 }
 509
 510 static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft, int buf_num)
 511 {
 512         struct scatterlist *sg = &gpn_ft->sg_req;
 513
 514         kmem_cache_free(zfcp_data.gpn_ft_cache, sg_virt(sg));
 515         zfcp_sg_free_table(gpn_ft->sg_resp, buf_num);
 516
 517         kfree(gpn_ft);
 518 }
 519
 520 static struct zfcp_gpn_ft *zfcp_alloc_sg_env(int buf_num)
 521 {
 522         struct zfcp_gpn_ft *gpn_ft;
 523         struct ct_iu_gpn_ft_req *req;
 524
 525         gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
 526         if (!gpn_ft)
 527                 return NULL;
 528
 529         req = kmem_cache_alloc(zfcp_data.gpn_ft_cache, GFP_KERNEL);
 530         if (!req) {
 531                 kfree(gpn_ft);
 532                 gpn_ft = NULL;
 533                 goto out;
 534         }
 535         sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
 536
 537         if (zfcp_sg_setup_table(gpn_ft->sg_resp, buf_num)) {
 538                 zfcp_free_sg_env(gpn_ft, buf_num);
 539                 gpn_ft = NULL;
 540         }
 541 out:
 542         return gpn_ft;
 543 }
 544
 545
 546 static int zfcp_fc_send_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
 547                                struct zfcp_adapter *adapter, int max_bytes)
 548 {
 549         struct zfcp_send_ct *ct = &gpn_ft->ct;
 550         struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
 551         struct zfcp_fc_ns_handler_data compl_rec;
 552         int ret;
 553
 554         /* prepare CT IU for GPN_FT */
 555         req->header.revision = ZFCP_CT_REVISION;
 556         req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
 557         req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
 558         req->header.options = ZFCP_CT_SYNCHRONOUS;
 559         req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
 560         req->header.max_res_size = max_bytes / 4;
 561         req->flags = 0;
 562         req->domain_id_scope = 0;
 563         req->area_id_scope = 0;
 564         req->fc4_type = ZFCP_CT_SCSI_FCP;
 565
 566         /* prepare zfcp_send_ct */
 567         ct->wka_port = &adapter->gs->ds;
 568         ct->handler = zfcp_fc_ns_handler;
 569         ct->handler_data = (unsigned long)&compl_rec;
 570         ct->req = &gpn_ft->sg_req;
 571         ct->resp = gpn_ft->sg_resp;
 572
 573         init_completion(&compl_rec.done);
 574         compl_rec.handler = NULL;
 575         ret = zfcp_fsf_send_ct(ct, NULL);
 576         if (!ret)
 577                 wait_for_completion(&compl_rec.done);
 578         return ret;
 579 }
 580
 581 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
 582 {
 583         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 584                 return;
 585
 586         atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
 587
 588         if ((port->supported_classes != 0) ||
 589             !list_empty(&port->unit_list))
 590                 return;
 591
 592         list_move_tail(&port->list, lh);
 593 }
 594
 595 static int zfcp_fc_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft, int max_entries)
 596 {
 597         struct zfcp_send_ct *ct = &gpn_ft->ct;
 598         struct scatterlist *sg = gpn_ft->sg_resp;
 599         struct ct_hdr *hdr = sg_virt(sg);
 600         struct gpn_ft_resp_acc *acc = sg_virt(sg);
 601         struct zfcp_adapter *adapter = ct->wka_port->adapter;
 602         struct zfcp_port *port, *tmp;
 603         unsigned long flags;
 604         LIST_HEAD(remove_lh);
 605         u32 d_id;
 606         int ret = 0, x, last = 0;
 607
 608         if (ct->status)
 609                 return -EIO;
 610
 611         if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
 612                 if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
 613                         return -EAGAIN; /* might be a temporary condition */
 614                 return -EIO;
 615         }
 616
 617         if (hdr->max_res_size) {
 618                 dev_warn(&adapter->ccw_device->dev,
 619                          "The name server reported %d words residual data\n",
 620                          hdr->max_res_size);
 621                 return -E2BIG;
 622         }
 623
 624         /* first entry is the header */
 625         for (x = 1; x < max_entries && !last; x++) {
 626                 if (x % (ZFCP_GPN_FT_ENTRIES + 1))
 627                         acc++;
 628                 else
 629                         acc = sg_virt(++sg);
 630
 631                 last = acc->control & 0x80;
 632                 d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 |
 633                        acc->port_id[2];
 634
 635                 /* don't attach ports with a well known address */
 636                 if ((d_id & ZFCP_DID_WKA) == ZFCP_DID_WKA)
 637                         continue;
 638                 /* skip the adapter's port and known remote ports */
 639                 if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
 640                         continue;
 641
 642                 port = zfcp_port_enqueue(adapter, acc->wwpn,
 643                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 644                 if (!IS_ERR(port))
 645                         zfcp_erp_port_reopen(port, 0, "fcegpf1", NULL);
 646                 else if (PTR_ERR(port) != -EEXIST)
 647                         ret = PTR_ERR(port);
 648         }
 649
 650         zfcp_erp_wait(adapter);
 651         write_lock_irqsave(&adapter->port_list_lock, flags);
 652         list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
 653                 zfcp_fc_validate_port(port, &remove_lh);
 654         write_unlock_irqrestore(&adapter->port_list_lock, flags);
 655
 656         list_for_each_entry_safe(port, tmp, &remove_lh, list) {
 657                 zfcp_erp_port_shutdown(port, 0, "fcegpf2", NULL);
 658                 zfcp_device_unregister(&port->sysfs_device,
 659                                        &zfcp_sysfs_port_attrs);
 660         }
 661
 662         return ret;
 663 }
 664
 665 /**
 666  * zfcp_fc_scan_ports - scan remote ports and attach new ports
 667  * @work: reference to scheduled work
 668  */
 669 void zfcp_fc_scan_ports(struct work_struct *work)
 670 {
 671         struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
 672                                                     scan_work);
 673         int ret, i;
 674         struct zfcp_gpn_ft *gpn_ft;
 675         int chain, max_entries, buf_num, max_bytes;
 676
 677         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 678         buf_num = chain ? ZFCP_GPN_FT_BUFFERS : 1;
 679         max_entries = chain ? ZFCP_GPN_FT_MAX_ENTRIES : ZFCP_GPN_FT_ENTRIES;
 680         max_bytes = chain ? ZFCP_GPN_FT_MAX_SIZE : ZFCP_CT_SIZE_ONE_PAGE;
 681
 682         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 683             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 684                 return;
 685
 686         if (zfcp_fc_wka_port_get(&adapter->gs->ds))
 687                 return;
 688
 689         gpn_ft = zfcp_alloc_sg_env(buf_num);
 690         if (!gpn_ft)
 691                 goto out;
 692
 693         for (i = 0; i < 3; i++) {
 694                 ret = zfcp_fc_send_gpn_ft(gpn_ft, adapter, max_bytes);
 695                 if (!ret) {
 696                         ret = zfcp_fc_eval_gpn_ft(gpn_ft, max_entries);
 697                         if (ret == -EAGAIN)
 698                                 ssleep(1);
 699                         else
 700                                 break;
 701                 }
 702         }
 703         zfcp_free_sg_env(gpn_ft, buf_num);
 704 out:
 705         zfcp_fc_wka_port_put(&adapter->gs->ds);
 706 }
 707
 708
 709 struct zfcp_els_fc_job {
 710         struct zfcp_send_els els;
 711         struct fc_bsg_job *job;
 712 };
 713
 714 static void zfcp_fc_generic_els_handler(unsigned long data)
 715 {
 716         struct zfcp_els_fc_job *els_fc_job = (struct zfcp_els_fc_job *) data;
 717         struct fc_bsg_job *job = els_fc_job->job;
 718         struct fc_bsg_reply *reply = job->reply;
 719
 720         if (els_fc_job->els.status) {
 721                 /* request rejected or timed out */
 722                 reply->reply_data.ctels_reply.status = FC_CTELS_STATUS_REJECT;
 723                 goto out;
 724         }
 725
 726         reply->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
 727         reply->reply_payload_rcv_len = job->reply_payload.payload_len;
 728
 729 out:
 730         job->state_flags = FC_RQST_STATE_DONE;
 731         job->job_done(job);
 732         kfree(els_fc_job);
 733 }
 734
 735 int zfcp_fc_execute_els_fc_job(struct fc_bsg_job *job)
 736 {
 737         struct zfcp_els_fc_job *els_fc_job;
 738         struct fc_rport *rport = job->rport;
 739         struct Scsi_Host *shost;
 740         struct zfcp_adapter *adapter;
 741         struct zfcp_port *port;
 742         u8 *port_did;
 743
 744         shost = rport ? rport_to_shost(rport) : job->shost;
 745         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 746
 747         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
 748                 return -EINVAL;
 749
 750         els_fc_job = kzalloc(sizeof(struct zfcp_els_fc_job), GFP_KERNEL);
 751         if (!els_fc_job)
 752                 return -ENOMEM;
 753
 754         els_fc_job->els.adapter = adapter;
 755         if (rport) {
 756                 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 757                 if (!port) {
 758                         kfree(els_fc_job);
 759                         return -EINVAL;
 760                 }
 761
 762                 els_fc_job->els.d_id = port->d_id;
 763                 put_device(&port->sysfs_device);
 764         } else {
 765                 port_did = job->request->rqst_data.h_els.port_id;
 766                 els_fc_job->els.d_id = (port_did[0] << 16) +
 767                                         (port_did[1] << 8) + port_did[2];
 768         }
 769
 770         els_fc_job->els.req = job->request_payload.sg_list;
 771         els_fc_job->els.resp = job->reply_payload.sg_list;
 772         els_fc_job->els.handler = zfcp_fc_generic_els_handler;
 773         els_fc_job->els.handler_data = (unsigned long) els_fc_job;
 774         els_fc_job->job = job;
 775
 776         return zfcp_fsf_send_els(&els_fc_job->els);
 777 }
 778
 779 struct zfcp_ct_fc_job {
 780         struct zfcp_send_ct ct;
 781         struct fc_bsg_job *job;
 782 };
 783
 784 static void zfcp_fc_generic_ct_handler(unsigned long data)
 785 {
 786         struct zfcp_ct_fc_job *ct_fc_job = (struct zfcp_ct_fc_job *) data;
 787         struct fc_bsg_job *job = ct_fc_job->job;
 788
 789         job->reply->reply_data.ctels_reply.status = ct_fc_job->ct.status ?
 790                                 FC_CTELS_STATUS_REJECT : FC_CTELS_STATUS_OK;
 791         job->reply->reply_payload_rcv_len = job->reply_payload.payload_len;
 792         job->state_flags = FC_RQST_STATE_DONE;
 793         job->job_done(job);
 794
 795         zfcp_fc_wka_port_put(ct_fc_job->ct.wka_port);
 796
 797         kfree(ct_fc_job);
 798 }
 799
 800 int zfcp_fc_execute_ct_fc_job(struct fc_bsg_job *job)
 801 {
 802         int ret;
 803         u8 gs_type;
 804         struct fc_rport *rport = job->rport;
 805         struct Scsi_Host *shost;
 806         struct zfcp_adapter *adapter;
 807         struct zfcp_ct_fc_job *ct_fc_job;
 808         u32 preamble_word1;
 809
 810         shost = rport ? rport_to_shost(rport) : job->shost;
 811
 812         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 813         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
 814                 return -EINVAL;
 815
 816         ct_fc_job = kzalloc(sizeof(struct zfcp_ct_fc_job), GFP_KERNEL);
 817         if (!ct_fc_job)
 818                 return -ENOMEM;
 819
 820         preamble_word1 = job->request->rqst_data.r_ct.preamble_word1;
 821         gs_type = (preamble_word1 & 0xff000000) >> 24;
 822
 823         switch (gs_type) {
 824         case FC_FST_ALIAS:
 825                 ct_fc_job->ct.wka_port = &adapter->gs->as;
 826                 break;
 827         case FC_FST_MGMT:
 828                 ct_fc_job->ct.wka_port = &adapter->gs->ms;
 829                 break;
 830         case FC_FST_TIME:
 831                 ct_fc_job->ct.wka_port = &adapter->gs->ts;
 832                 break;
 833         case FC_FST_DIR:
 834                 ct_fc_job->ct.wka_port = &adapter->gs->ds;
 835                 break;
 836         default:
 837                 kfree(ct_fc_job);
 838                 return -EINVAL; /* no such service */
 839         }
 840
 841         ret = zfcp_fc_wka_port_get(ct_fc_job->ct.wka_port);
 842         if (ret) {
 843                 kfree(ct_fc_job);
 844                 return ret;
 845         }
 846
 847         ct_fc_job->ct.req = job->request_payload.sg_list;
 848         ct_fc_job->ct.resp = job->reply_payload.sg_list;
 849         ct_fc_job->ct.handler = zfcp_fc_generic_ct_handler;
 850         ct_fc_job->ct.handler_data = (unsigned long) ct_fc_job;
 851         ct_fc_job->ct.completion = NULL;
 852         ct_fc_job->job = job;
 853
 854         ret = zfcp_fsf_send_ct(&ct_fc_job->ct, NULL);
 855         if (ret) {
 856                 kfree(ct_fc_job);
 857                 zfcp_fc_wka_port_put(ct_fc_job->ct.wka_port);
 858         }
 859         return ret;
 860 }
 861
 862 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
 863 {
 864         struct zfcp_wka_ports *wka_ports;
 865
 866         wka_ports = kzalloc(sizeof(struct zfcp_wka_ports), GFP_KERNEL);
 867         if (!wka_ports)
 868                 return -ENOMEM;
 869
 870         adapter->gs = wka_ports;
 871         zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);
 872         zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);
 873         zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);
 874         zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);
 875         zfcp_fc_wka_port_init(&wka_ports->ks, FC_FID_SEC_KEY, adapter);
 876
 877         return 0;
 878 }
 879
 880 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)
 881 {
 882         kfree(adapter->gs);
 883         adapter->gs = NULL;
 884 }
 885