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 <linux/types.h>
  13 #include <scsi/fc/fc_els.h>
  14 #include <scsi/libfc.h>
  15 #include "zfcp_ext.h"
  16 #include "zfcp_fc.h"
  17
  18 static u32 zfcp_fc_rscn_range_mask[] = {
  19         [ELS_ADDR_FMT_PORT]             = 0xFFFFFF,
  20         [ELS_ADDR_FMT_AREA]             = 0xFFFF00,
  21         [ELS_ADDR_FMT_DOM]              = 0xFF0000,
  22         [ELS_ADDR_FMT_FAB]              = 0x000000,
  23 };
  24
  25 static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port)
  26 {
  27         if (mutex_lock_interruptible(&wka_port->mutex))
  28                 return -ERESTARTSYS;
  29
  30         if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE ||
  31             wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) {
  32                 wka_port->status = ZFCP_FC_WKA_PORT_OPENING;
  33                 if (zfcp_fsf_open_wka_port(wka_port))
  34                         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
  35         }
  36
  37         mutex_unlock(&wka_port->mutex);
  38
  39         wait_event(wka_port->completion_wq,
  40                    wka_port->status == ZFCP_FC_WKA_PORT_ONLINE ||
  41                    wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
  42
  43         if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) {
  44                 atomic_inc(&wka_port->refcount);
  45                 return 0;
  46         }
  47         return -EIO;
  48 }
  49
  50 static void zfcp_fc_wka_port_offline(struct work_struct *work)
  51 {
  52         struct delayed_work *dw = to_delayed_work(work);
  53         struct zfcp_fc_wka_port *wka_port =
  54                         container_of(dw, struct zfcp_fc_wka_port, work);
  55
  56         mutex_lock(&wka_port->mutex);
  57         if ((atomic_read(&wka_port->refcount) != 0) ||
  58             (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE))
  59                 goto out;
  60
  61         wka_port->status = ZFCP_FC_WKA_PORT_CLOSING;
  62         if (zfcp_fsf_close_wka_port(wka_port)) {
  63                 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
  64                 wake_up(&wka_port->completion_wq);
  65         }
  66 out:
  67         mutex_unlock(&wka_port->mutex);
  68 }
  69
  70 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port)
  71 {
  72         if (atomic_dec_return(&wka_port->refcount) != 0)
  73                 return;
  74         /* wait 10 milliseconds, other reqs might pop in */
  75         schedule_delayed_work(&wka_port->work, HZ / 100);
  76 }
  77
  78 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id,
  79                                   struct zfcp_adapter *adapter)
  80 {
  81         init_waitqueue_head(&wka_port->completion_wq);
  82
  83         wka_port->adapter = adapter;
  84         wka_port->d_id = d_id;
  85
  86         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
  87         atomic_set(&wka_port->refcount, 0);
  88         mutex_init(&wka_port->mutex);
  89         INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline);
  90 }
  91
  92 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka)
  93 {
  94         cancel_delayed_work_sync(&wka->work);
  95         mutex_lock(&wka->mutex);
  96         wka->status = ZFCP_FC_WKA_PORT_OFFLINE;
  97         mutex_unlock(&wka->mutex);
  98 }
  99
 100 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs)
 101 {
 102         if (!gs)
 103                 return;
 104         zfcp_fc_wka_port_force_offline(&gs->ms);
 105         zfcp_fc_wka_port_force_offline(&gs->ts);
 106         zfcp_fc_wka_port_force_offline(&gs->ds);
 107         zfcp_fc_wka_port_force_offline(&gs->as);
 108 }
 109
 110 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
 111                                    struct fc_els_rscn_page *page)
 112 {
 113         unsigned long flags;
 114         struct zfcp_adapter *adapter = fsf_req->adapter;
 115         struct zfcp_port *port;
 116
 117         read_lock_irqsave(&adapter->port_list_lock, flags);
 118         list_for_each_entry(port, &adapter->port_list, list) {
 119                 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range))
 120                         zfcp_fc_test_link(port);
 121                 if (!port->d_id)
 122                         zfcp_erp_port_reopen(port,
 123                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 124                                              "fcrscn1", NULL);
 125         }
 126         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 127 }
 128
 129 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 130 {
 131         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 132         struct fc_els_rscn *head;
 133         struct fc_els_rscn_page *page;
 134         u16 i;
 135         u16 no_entries;
 136         unsigned int afmt;
 137
 138         head = (struct fc_els_rscn *) status_buffer->payload.data;
 139         page = (struct fc_els_rscn_page *) head;
 140
 141         /* see FC-FS */
 142         no_entries = head->rscn_plen / sizeof(struct fc_els_rscn_page);
 143
 144         for (i = 1; i < no_entries; i++) {
 145                 /* skip head and start with 1st element */
 146                 page++;
 147                 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
 148                 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
 149                                        page);
 150         }
 151         queue_work(fsf_req->adapter->work_queue, &fsf_req->adapter->scan_work);
 152 }
 153
 154 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 155 {
 156         unsigned long flags;
 157         struct zfcp_adapter *adapter = req->adapter;
 158         struct zfcp_port *port;
 159
 160         read_lock_irqsave(&adapter->port_list_lock, flags);
 161         list_for_each_entry(port, &adapter->port_list, list)
 162                 if (port->wwpn == wwpn) {
 163                         zfcp_erp_port_forced_reopen(port, 0, "fciwwp1", req);
 164                         break;
 165                 }
 166         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 167 }
 168
 169 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 170 {
 171         struct fsf_status_read_buffer *status_buffer;
 172         struct fc_els_flogi *plogi;
 173
 174         status_buffer = (struct fsf_status_read_buffer *) req->data;
 175         plogi = (struct fc_els_flogi *) status_buffer->payload.data;
 176         zfcp_fc_incoming_wwpn(req, plogi->fl_wwpn);
 177 }
 178
 179 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 180 {
 181         struct fsf_status_read_buffer *status_buffer =
 182                 (struct fsf_status_read_buffer *)req->data;
 183         struct fc_els_logo *logo =
 184                 (struct fc_els_logo *) status_buffer->payload.data;
 185
 186         zfcp_fc_incoming_wwpn(req, logo->fl_n_port_wwn);
 187 }
 188
 189 /**
 190  * zfcp_fc_incoming_els - handle incoming ELS
 191  * @fsf_req - request which contains incoming ELS
 192  */
 193 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 194 {
 195         struct fsf_status_read_buffer *status_buffer =
 196                 (struct fsf_status_read_buffer *) fsf_req->data;
 197         unsigned int els_type = status_buffer->payload.data[0];
 198
 199         zfcp_dbf_san_incoming_els(fsf_req);
 200         if (els_type == ELS_PLOGI)
 201                 zfcp_fc_incoming_plogi(fsf_req);
 202         else if (els_type == ELS_LOGO)
 203                 zfcp_fc_incoming_logo(fsf_req);
 204         else if (els_type == ELS_RSCN)
 205                 zfcp_fc_incoming_rscn(fsf_req);
 206 }
 207
 208 static void zfcp_fc_ns_gid_pn_eval(void *data)
 209 {
 210         struct zfcp_fc_gid_pn *gid_pn = data;
 211         struct zfcp_fsf_ct_els *ct = &gid_pn->ct;
 212         struct zfcp_fc_gid_pn_req *gid_pn_req = sg_virt(ct->req);
 213         struct zfcp_fc_gid_pn_resp *gid_pn_resp = sg_virt(ct->resp);
 214         struct zfcp_port *port = gid_pn->port;
 215
 216         if (ct->status)
 217                 return;
 218         if (gid_pn_resp->ct_hdr.ct_cmd != FC_FS_ACC)
 219                 return;
 220
 221         /* paranoia */
 222         if (gid_pn_req->gid_pn.fn_wwpn != port->wwpn)
 223                 return;
 224         /* looks like a valid d_id */
 225         port->d_id = ntoh24(gid_pn_resp->gid_pn.fp_fid);
 226 }
 227
 228 static void zfcp_fc_complete(void *data)
 229 {
 230         complete(data);
 231 }
 232
 233 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
 234                                      struct zfcp_fc_gid_pn *gid_pn)
 235 {
 236         struct zfcp_adapter *adapter = port->adapter;
 237         DECLARE_COMPLETION_ONSTACK(completion);
 238         int ret;
 239
 240         /* setup parameters for send generic command */
 241         gid_pn->port = port;
 242         gid_pn->ct.handler = zfcp_fc_complete;
 243         gid_pn->ct.handler_data = &completion;
 244         gid_pn->ct.req = &gid_pn->sg_req;
 245         gid_pn->ct.resp = &gid_pn->sg_resp;
 246         sg_init_one(&gid_pn->sg_req, &gid_pn->gid_pn_req,
 247                     sizeof(struct zfcp_fc_gid_pn_req));
 248         sg_init_one(&gid_pn->sg_resp, &gid_pn->gid_pn_resp,
 249                     sizeof(struct zfcp_fc_gid_pn_resp));
 250
 251         /* setup nameserver request */
 252         gid_pn->gid_pn_req.ct_hdr.ct_rev = FC_CT_REV;
 253         gid_pn->gid_pn_req.ct_hdr.ct_fs_type = FC_FST_DIR;
 254         gid_pn->gid_pn_req.ct_hdr.ct_fs_subtype = FC_NS_SUBTYPE;
 255         gid_pn->gid_pn_req.ct_hdr.ct_options = 0;
 256         gid_pn->gid_pn_req.ct_hdr.ct_cmd = FC_NS_GID_PN;
 257         gid_pn->gid_pn_req.ct_hdr.ct_mr_size = ZFCP_FC_CT_SIZE_PAGE / 4;
 258         gid_pn->gid_pn_req.gid_pn.fn_wwpn = port->wwpn;
 259
 260         ret = zfcp_fsf_send_ct(&adapter->gs->ds, &gid_pn->ct,
 261                                adapter->pool.gid_pn_req,
 262                                ZFCP_FC_CTELS_TMO);
 263         if (!ret) {
 264                 wait_for_completion(&completion);
 265                 zfcp_fc_ns_gid_pn_eval(gid_pn);
 266         }
 267         return ret;
 268 }
 269
 270 /**
 271  * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
 272  * @port: port where GID_PN request is needed
 273  * return: -ENOMEM on error, 0 otherwise
 274  */
 275 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
 276 {
 277         int ret;
 278         struct zfcp_fc_gid_pn *gid_pn;
 279         struct zfcp_adapter *adapter = port->adapter;
 280
 281         gid_pn = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC);
 282         if (!gid_pn)
 283                 return -ENOMEM;
 284
 285         memset(gid_pn, 0, sizeof(*gid_pn));
 286
 287         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 288         if (ret)
 289                 goto out;
 290
 291         ret = zfcp_fc_ns_gid_pn_request(port, gid_pn);
 292
 293         zfcp_fc_wka_port_put(&adapter->gs->ds);
 294 out:
 295         mempool_free(gid_pn, adapter->pool.gid_pn);
 296         return ret;
 297 }
 298
 299 void zfcp_fc_port_did_lookup(struct work_struct *work)
 300 {
 301         int ret;
 302         struct zfcp_port *port = container_of(work, struct zfcp_port,
 303                                               gid_pn_work);
 304
 305         ret = zfcp_fc_ns_gid_pn(port);
 306         if (ret) {
 307                 /* could not issue gid_pn for some reason */
 308                 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1", NULL);
 309                 goto out;
 310         }
 311
 312         if (!port->d_id) {
 313                 zfcp_erp_port_failed(port, "fcgpn_2", NULL);
 314                 goto out;
 315         }
 316
 317         zfcp_erp_port_reopen(port, 0, "fcgpn_3", NULL);
 318 out:
 319         put_device(&port->sysfs_device);
 320 }
 321
 322 /**
 323  * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request
 324  * @port: The zfcp_port to lookup the d_id for.
 325  */
 326 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)
 327 {
 328         get_device(&port->sysfs_device);
 329         if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))
 330                 put_device(&port->sysfs_device);
 331 }
 332
 333 /**
 334  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 335  * @port: zfcp_port structure
 336  * @plogi: plogi payload
 337  *
 338  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 339  */
 340 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi)
 341 {
 342         if (plogi->fl_wwpn != port->wwpn) {
 343                 port->d_id = 0;
 344                 dev_warn(&port->adapter->ccw_device->dev,
 345                          "A port opened with WWPN 0x%016Lx returned data that "
 346                          "identifies it as WWPN 0x%016Lx\n",
 347                          (unsigned long long) port->wwpn,
 348                          (unsigned long long) plogi->fl_wwpn);
 349                 return;
 350         }
 351
 352         port->wwnn = plogi->fl_wwnn;
 353         port->maxframe_size = plogi->fl_csp.sp_bb_data;
 354
 355         if (plogi->fl_cssp[0].cp_class & FC_CPC_VALID)
 356                 port->supported_classes |= FC_COS_CLASS1;
 357         if (plogi->fl_cssp[1].cp_class & FC_CPC_VALID)
 358                 port->supported_classes |= FC_COS_CLASS2;
 359         if (plogi->fl_cssp[2].cp_class & FC_CPC_VALID)
 360                 port->supported_classes |= FC_COS_CLASS3;
 361         if (plogi->fl_cssp[3].cp_class & FC_CPC_VALID)
 362                 port->supported_classes |= FC_COS_CLASS4;
 363 }
 364
 365 static void zfcp_fc_adisc_handler(void *data)
 366 {
 367         struct zfcp_fc_els_adisc *adisc = data;
 368         struct zfcp_port *port = adisc->els.port;
 369         struct fc_els_adisc *adisc_resp = &adisc->adisc_resp;
 370
 371         if (adisc->els.status) {
 372                 /* request rejected or timed out */
 373                 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 374                                             "fcadh_1", NULL);
 375                 goto out;
 376         }
 377
 378         if (!port->wwnn)
 379                 port->wwnn = adisc_resp->adisc_wwnn;
 380
 381         if ((port->wwpn != adisc_resp->adisc_wwpn) ||
 382             !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 383                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 384                                      "fcadh_2", NULL);
 385                 goto out;
 386         }
 387
 388         /* port is good, unblock rport without going through erp */
 389         zfcp_scsi_schedule_rport_register(port);
 390  out:
 391         atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 392         put_device(&port->sysfs_device);
 393         kmem_cache_free(zfcp_data.adisc_cache, adisc);
 394 }
 395
 396 static int zfcp_fc_adisc(struct zfcp_port *port)
 397 {
 398         struct zfcp_fc_els_adisc *adisc;
 399         struct zfcp_adapter *adapter = port->adapter;
 400         int ret;
 401
 402         adisc = kmem_cache_alloc(zfcp_data.adisc_cache, GFP_ATOMIC);
 403         if (!adisc)
 404                 return -ENOMEM;
 405
 406         adisc->els.port = port;
 407         adisc->els.req = &adisc->req;
 408         adisc->els.resp = &adisc->resp;
 409         sg_init_one(adisc->els.req, &adisc->adisc_req,
 410                     sizeof(struct fc_els_adisc));
 411         sg_init_one(adisc->els.resp, &adisc->adisc_resp,
 412                     sizeof(struct fc_els_adisc));
 413
 414         adisc->els.handler = zfcp_fc_adisc_handler;
 415         adisc->els.handler_data = adisc;
 416
 417         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 418            without FC-AL-2 capability, so we don't set it */
 419         adisc->adisc_req.adisc_wwpn = fc_host_port_name(adapter->scsi_host);
 420         adisc->adisc_req.adisc_wwnn = fc_host_node_name(adapter->scsi_host);
 421         adisc->adisc_req.adisc_cmd = ELS_ADISC;
 422         hton24(adisc->adisc_req.adisc_port_id,
 423                fc_host_port_id(adapter->scsi_host));
 424
 425         ret = zfcp_fsf_send_els(adapter, port->d_id, &adisc->els,
 426                                 ZFCP_FC_CTELS_TMO);
 427         if (ret)
 428                 kmem_cache_free(zfcp_data.adisc_cache, adisc);
 429
 430         return ret;
 431 }
 432
 433 void zfcp_fc_link_test_work(struct work_struct *work)
 434 {
 435         struct zfcp_port *port =
 436                 container_of(work, struct zfcp_port, test_link_work);
 437         int retval;
 438
 439         get_device(&port->sysfs_device);
 440         port->rport_task = RPORT_DEL;
 441         zfcp_scsi_rport_work(&port->rport_work);
 442
 443         /* only issue one test command at one time per port */
 444         if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
 445                 goto out;
 446
 447         atomic_set_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 448
 449         retval = zfcp_fc_adisc(port);
 450         if (retval == 0)
 451                 return;
 452
 453         /* send of ADISC was not possible */
 454         atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 455         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1", NULL);
 456
 457 out:
 458         put_device(&port->sysfs_device);
 459 }
 460
 461 /**
 462  * zfcp_fc_test_link - lightweight link test procedure
 463  * @port: port to be tested
 464  *
 465  * Test status of a link to a remote port using the ELS command ADISC.
 466  * If there is a problem with the remote port, error recovery steps
 467  * will be triggered.
 468  */
 469 void zfcp_fc_test_link(struct zfcp_port *port)
 470 {
 471         get_device(&port->sysfs_device);
 472         if (!queue_work(port->adapter->work_queue, &port->test_link_work))
 473                 put_device(&port->sysfs_device);
 474 }
 475
 476 static void zfcp_free_sg_env(struct zfcp_fc_gpn_ft *gpn_ft, int buf_num)
 477 {
 478         struct scatterlist *sg = &gpn_ft->sg_req;
 479
 480         kmem_cache_free(zfcp_data.gpn_ft_cache, sg_virt(sg));
 481         zfcp_sg_free_table(gpn_ft->sg_resp, buf_num);
 482
 483         kfree(gpn_ft);
 484 }
 485
 486 static struct zfcp_fc_gpn_ft *zfcp_alloc_sg_env(int buf_num)
 487 {
 488         struct zfcp_fc_gpn_ft *gpn_ft;
 489         struct zfcp_fc_gpn_ft_req *req;
 490
 491         gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
 492         if (!gpn_ft)
 493                 return NULL;
 494
 495         req = kmem_cache_alloc(zfcp_data.gpn_ft_cache, GFP_KERNEL);
 496         if (!req) {
 497                 kfree(gpn_ft);
 498                 gpn_ft = NULL;
 499                 goto out;
 500         }
 501         sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
 502
 503         if (zfcp_sg_setup_table(gpn_ft->sg_resp, buf_num)) {
 504                 zfcp_free_sg_env(gpn_ft, buf_num);
 505                 gpn_ft = NULL;
 506         }
 507 out:
 508         return gpn_ft;
 509 }
 510
 511
 512 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_gpn_ft *gpn_ft,
 513                                struct zfcp_adapter *adapter, int max_bytes)
 514 {
 515         struct zfcp_fsf_ct_els *ct = &gpn_ft->ct;
 516         struct zfcp_fc_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
 517         DECLARE_COMPLETION_ONSTACK(completion);
 518         int ret;
 519
 520         /* prepare CT IU for GPN_FT */
 521         req->ct_hdr.ct_rev = FC_CT_REV;
 522         req->ct_hdr.ct_fs_type = FC_FST_DIR;
 523         req->ct_hdr.ct_fs_subtype = FC_NS_SUBTYPE;
 524         req->ct_hdr.ct_options = 0;
 525         req->ct_hdr.ct_cmd = FC_NS_GPN_FT;
 526         req->ct_hdr.ct_mr_size = max_bytes / 4;
 527         req->gpn_ft.fn_domain_id_scope = 0;
 528         req->gpn_ft.fn_area_id_scope = 0;
 529         req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;
 530
 531         /* prepare zfcp_send_ct */
 532         ct->handler = zfcp_fc_complete;
 533         ct->handler_data = &completion;
 534         ct->req = &gpn_ft->sg_req;
 535         ct->resp = gpn_ft->sg_resp;
 536
 537         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct, NULL,
 538                                ZFCP_FC_CTELS_TMO);
 539         if (!ret)
 540                 wait_for_completion(&completion);
 541         return ret;
 542 }
 543
 544 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
 545 {
 546         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 547                 return;
 548
 549         atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
 550
 551         if ((port->supported_classes != 0) ||
 552             !list_empty(&port->unit_list))
 553                 return;
 554
 555         list_move_tail(&port->list, lh);
 556 }
 557
 558 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_gpn_ft *gpn_ft,
 559                                struct zfcp_adapter *adapter, int max_entries)
 560 {
 561         struct zfcp_fsf_ct_els *ct = &gpn_ft->ct;
 562         struct scatterlist *sg = gpn_ft->sg_resp;
 563         struct fc_ct_hdr *hdr = sg_virt(sg);
 564         struct fc_gpn_ft_resp *acc = sg_virt(sg);
 565         struct zfcp_port *port, *tmp;
 566         unsigned long flags;
 567         LIST_HEAD(remove_lh);
 568         u32 d_id;
 569         int ret = 0, x, last = 0;
 570
 571         if (ct->status)
 572                 return -EIO;
 573
 574         if (hdr->ct_cmd != FC_FS_ACC) {
 575                 if (hdr->ct_reason == FC_BA_RJT_UNABLE)
 576                         return -EAGAIN; /* might be a temporary condition */
 577                 return -EIO;
 578         }
 579
 580         if (hdr->ct_mr_size) {
 581                 dev_warn(&adapter->ccw_device->dev,
 582                          "The name server reported %d words residual data\n",
 583                          hdr->ct_mr_size);
 584                 return -E2BIG;
 585         }
 586
 587         /* first entry is the header */
 588         for (x = 1; x < max_entries && !last; x++) {
 589                 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
 590                         acc++;
 591                 else
 592                         acc = sg_virt(++sg);
 593
 594                 last = acc->fp_flags & FC_NS_FID_LAST;
 595                 d_id = ntoh24(acc->fp_fid);
 596
 597                 /* don't attach ports with a well known address */
 598                 if (d_id >= FC_FID_WELL_KNOWN_BASE)
 599                         continue;
 600                 /* skip the adapter's port and known remote ports */
 601                 if (acc->fp_wwpn == fc_host_port_name(adapter->scsi_host))
 602                         continue;
 603
 604                 port = zfcp_port_enqueue(adapter, acc->fp_wwpn,
 605                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 606                 if (!IS_ERR(port))
 607                         zfcp_erp_port_reopen(port, 0, "fcegpf1", NULL);
 608                 else if (PTR_ERR(port) != -EEXIST)
 609                         ret = PTR_ERR(port);
 610         }
 611
 612         zfcp_erp_wait(adapter);
 613         write_lock_irqsave(&adapter->port_list_lock, flags);
 614         list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
 615                 zfcp_fc_validate_port(port, &remove_lh);
 616         write_unlock_irqrestore(&adapter->port_list_lock, flags);
 617
 618         list_for_each_entry_safe(port, tmp, &remove_lh, list) {
 619                 zfcp_erp_port_shutdown(port, 0, "fcegpf2", NULL);
 620                 zfcp_device_unregister(&port->sysfs_device,
 621                                        &zfcp_sysfs_port_attrs);
 622         }
 623
 624         return ret;
 625 }
 626
 627 /**
 628  * zfcp_fc_scan_ports - scan remote ports and attach new ports
 629  * @work: reference to scheduled work
 630  */
 631 void zfcp_fc_scan_ports(struct work_struct *work)
 632 {
 633         struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
 634                                                     scan_work);
 635         int ret, i;
 636         struct zfcp_fc_gpn_ft *gpn_ft;
 637         int chain, max_entries, buf_num, max_bytes;
 638
 639         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 640         buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1;
 641         max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE;
 642         max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE;
 643
 644         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 645             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 646                 return;
 647
 648         if (zfcp_fc_wka_port_get(&adapter->gs->ds))
 649                 return;
 650
 651         gpn_ft = zfcp_alloc_sg_env(buf_num);
 652         if (!gpn_ft)
 653                 goto out;
 654
 655         for (i = 0; i < 3; i++) {
 656                 ret = zfcp_fc_send_gpn_ft(gpn_ft, adapter, max_bytes);
 657                 if (!ret) {
 658                         ret = zfcp_fc_eval_gpn_ft(gpn_ft, adapter, max_entries);
 659                         if (ret == -EAGAIN)
 660                                 ssleep(1);
 661                         else
 662                                 break;
 663                 }
 664         }
 665         zfcp_free_sg_env(gpn_ft, buf_num);
 666 out:
 667         zfcp_fc_wka_port_put(&adapter->gs->ds);
 668 }
 669
 670 static void zfcp_fc_ct_els_job_handler(void *data)
 671 {
 672         struct fc_bsg_job *job = data;
 673         struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data;
 674         int status = zfcp_ct_els->status;
 675         int reply_status;
 676
 677         reply_status = status ? FC_CTELS_STATUS_REJECT : FC_CTELS_STATUS_OK;
 678         job->reply->reply_data.ctels_reply.status = reply_status;
 679         job->reply->reply_payload_rcv_len = job->reply_payload.payload_len;
 680         job->job_done(job);
 681 }
 682
 683 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct fc_bsg_job *job)
 684 {
 685         u32 preamble_word1;
 686         u8 gs_type;
 687         struct zfcp_adapter *adapter;
 688
 689         preamble_word1 = job->request->rqst_data.r_ct.preamble_word1;
 690         gs_type = (preamble_word1 & 0xff000000) >> 24;
 691
 692         adapter = (struct zfcp_adapter *) job->shost->hostdata[0];
 693
 694         switch (gs_type) {
 695         case FC_FST_ALIAS:
 696                 return &adapter->gs->as;
 697         case FC_FST_MGMT:
 698                 return &adapter->gs->ms;
 699         case FC_FST_TIME:
 700                 return &adapter->gs->ts;
 701                 break;
 702         case FC_FST_DIR:
 703                 return &adapter->gs->ds;
 704                 break;
 705         default:
 706                 return NULL;
 707         }
 708 }
 709
 710 static void zfcp_fc_ct_job_handler(void *data)
 711 {
 712         struct fc_bsg_job *job = data;
 713         struct zfcp_fc_wka_port *wka_port;
 714
 715         wka_port = zfcp_fc_job_wka_port(job);
 716         zfcp_fc_wka_port_put(wka_port);
 717
 718         zfcp_fc_ct_els_job_handler(data);
 719 }
 720
 721 static int zfcp_fc_exec_els_job(struct fc_bsg_job *job,
 722                                 struct zfcp_adapter *adapter)
 723 {
 724         struct zfcp_fsf_ct_els *els = job->dd_data;
 725         struct fc_rport *rport = job->rport;
 726         struct zfcp_port *port;
 727         u32 d_id;
 728
 729         if (rport) {
 730                 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 731                 if (!port)
 732                         return -EINVAL;
 733
 734                 d_id = port->d_id;
 735                 put_device(&port->sysfs_device);
 736         } else
 737                 d_id = ntoh24(job->request->rqst_data.h_els.port_id);
 738
 739         els->handler = zfcp_fc_ct_els_job_handler;
 740         return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ);
 741 }
 742
 743 static int zfcp_fc_exec_ct_job(struct fc_bsg_job *job,
 744                                struct zfcp_adapter *adapter)
 745 {
 746         int ret;
 747         struct zfcp_fsf_ct_els *ct = job->dd_data;
 748         struct zfcp_fc_wka_port *wka_port;
 749
 750         wka_port = zfcp_fc_job_wka_port(job);
 751         if (!wka_port)
 752                 return -EINVAL;
 753
 754         ret = zfcp_fc_wka_port_get(wka_port);
 755         if (ret)
 756                 return ret;
 757
 758         ct->handler = zfcp_fc_ct_job_handler;
 759         ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ);
 760         if (ret)
 761                 zfcp_fc_wka_port_put(wka_port);
 762
 763         return ret;
 764 }
 765
 766 int zfcp_fc_exec_bsg_job(struct fc_bsg_job *job)
 767 {
 768         struct Scsi_Host *shost;
 769         struct zfcp_adapter *adapter;
 770         struct zfcp_fsf_ct_els *ct_els = job->dd_data;
 771
 772         shost = job->rport ? rport_to_shost(job->rport) : job->shost;
 773         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 774
 775         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
 776                 return -EINVAL;
 777
 778         ct_els->req = job->request_payload.sg_list;
 779         ct_els->resp = job->reply_payload.sg_list;
 780         ct_els->handler_data = job;
 781
 782         switch (job->request->msgcode) {
 783         case FC_BSG_RPT_ELS:
 784         case FC_BSG_HST_ELS_NOLOGIN:
 785                 return zfcp_fc_exec_els_job(job, adapter);
 786         case FC_BSG_RPT_CT:
 787         case FC_BSG_HST_CT:
 788                 return zfcp_fc_exec_ct_job(job, adapter);
 789         default:
 790                 return -EINVAL;
 791         }
 792 }
 793
 794 int zfcp_fc_timeout_bsg_job(struct fc_bsg_job *job)
 795 {
 796         /* hardware tracks timeout, reset bsg timeout to not interfere */
 797         return -EAGAIN;
 798 }
 799
 800 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
 801 {
 802         struct zfcp_fc_wka_ports *wka_ports;
 803
 804         wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL);
 805         if (!wka_ports)
 806                 return -ENOMEM;
 807
 808         adapter->gs = wka_ports;
 809         zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);
 810         zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);
 811         zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);
 812         zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);
 813
 814         return 0;
 815 }
 816
 817 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)
 818 {
 819         kfree(adapter->gs);
 820         adapter->gs = NULL;
 821 }
 822