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, 2010
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/types.h>
  13 #include <linux/slab.h>
  14 #include <scsi/fc/fc_els.h>
  15 #include <scsi/libfc.h>
  16 #include "zfcp_ext.h"
  17 #include "zfcp_fc.h"
  18
  19 static u32 zfcp_fc_rscn_range_mask[] = {
  20         [ELS_ADDR_FMT_PORT]             = 0xFFFFFF,
  21         [ELS_ADDR_FMT_AREA]             = 0xFFFF00,
  22         [ELS_ADDR_FMT_DOM]              = 0xFF0000,
  23         [ELS_ADDR_FMT_FAB]              = 0x000000,
  24 };
  25
  26 static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port)
  27 {
  28         if (mutex_lock_interruptible(&wka_port->mutex))
  29                 return -ERESTARTSYS;
  30
  31         if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE ||
  32             wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) {
  33                 wka_port->status = ZFCP_FC_WKA_PORT_OPENING;
  34                 if (zfcp_fsf_open_wka_port(wka_port))
  35                         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
  36         }
  37
  38         mutex_unlock(&wka_port->mutex);
  39
  40         wait_event(wka_port->completion_wq,
  41                    wka_port->status == ZFCP_FC_WKA_PORT_ONLINE ||
  42                    wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
  43
  44         if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) {
  45                 atomic_inc(&wka_port->refcount);
  46                 return 0;
  47         }
  48         return -EIO;
  49 }
  50
  51 static void zfcp_fc_wka_port_offline(struct work_struct *work)
  52 {
  53         struct delayed_work *dw = to_delayed_work(work);
  54         struct zfcp_fc_wka_port *wka_port =
  55                         container_of(dw, struct zfcp_fc_wka_port, work);
  56
  57         mutex_lock(&wka_port->mutex);
  58         if ((atomic_read(&wka_port->refcount) != 0) ||
  59             (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE))
  60                 goto out;
  61
  62         wka_port->status = ZFCP_FC_WKA_PORT_CLOSING;
  63         if (zfcp_fsf_close_wka_port(wka_port)) {
  64                 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
  65                 wake_up(&wka_port->completion_wq);
  66         }
  67 out:
  68         mutex_unlock(&wka_port->mutex);
  69 }
  70
  71 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port)
  72 {
  73         if (atomic_dec_return(&wka_port->refcount) != 0)
  74                 return;
  75         /* wait 10 milliseconds, other reqs might pop in */
  76         schedule_delayed_work(&wka_port->work, HZ / 100);
  77 }
  78
  79 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id,
  80                                   struct zfcp_adapter *adapter)
  81 {
  82         init_waitqueue_head(&wka_port->completion_wq);
  83
  84         wka_port->adapter = adapter;
  85         wka_port->d_id = d_id;
  86
  87         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
  88         atomic_set(&wka_port->refcount, 0);
  89         mutex_init(&wka_port->mutex);
  90         INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline);
  91 }
  92
  93 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka)
  94 {
  95         cancel_delayed_work_sync(&wka->work);
  96         mutex_lock(&wka->mutex);
  97         wka->status = ZFCP_FC_WKA_PORT_OFFLINE;
  98         mutex_unlock(&wka->mutex);
  99 }
 100
 101 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs)
 102 {
 103         if (!gs)
 104                 return;
 105         zfcp_fc_wka_port_force_offline(&gs->ms);
 106         zfcp_fc_wka_port_force_offline(&gs->ts);
 107         zfcp_fc_wka_port_force_offline(&gs->ds);
 108         zfcp_fc_wka_port_force_offline(&gs->as);
 109 }
 110
 111 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
 112                                    struct fc_els_rscn_page *page)
 113 {
 114         unsigned long flags;
 115         struct zfcp_adapter *adapter = fsf_req->adapter;
 116         struct zfcp_port *port;
 117
 118         read_lock_irqsave(&adapter->port_list_lock, flags);
 119         list_for_each_entry(port, &adapter->port_list, list) {
 120                 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range))
 121                         zfcp_fc_test_link(port);
 122                 if (!port->d_id)
 123                         zfcp_erp_port_reopen(port,
 124                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 125                                              "fcrscn1", NULL);
 126         }
 127         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 128 }
 129
 130 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 131 {
 132         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 133         struct fc_els_rscn *head;
 134         struct fc_els_rscn_page *page;
 135         u16 i;
 136         u16 no_entries;
 137         unsigned int afmt;
 138
 139         head = (struct fc_els_rscn *) status_buffer->payload.data;
 140         page = (struct fc_els_rscn_page *) head;
 141
 142         /* see FC-FS */
 143         no_entries = head->rscn_plen / sizeof(struct fc_els_rscn_page);
 144
 145         for (i = 1; i < no_entries; i++) {
 146                 /* skip head and start with 1st element */
 147                 page++;
 148                 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
 149                 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
 150                                        page);
 151         }
 152         queue_work(fsf_req->adapter->work_queue, &fsf_req->adapter->scan_work);
 153 }
 154
 155 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 156 {
 157         unsigned long flags;
 158         struct zfcp_adapter *adapter = req->adapter;
 159         struct zfcp_port *port;
 160
 161         read_lock_irqsave(&adapter->port_list_lock, flags);
 162         list_for_each_entry(port, &adapter->port_list, list)
 163                 if (port->wwpn == wwpn) {
 164                         zfcp_erp_port_forced_reopen(port, 0, "fciwwp1", req);
 165                         break;
 166                 }
 167         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 168 }
 169
 170 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 171 {
 172         struct fsf_status_read_buffer *status_buffer;
 173         struct fc_els_flogi *plogi;
 174
 175         status_buffer = (struct fsf_status_read_buffer *) req->data;
 176         plogi = (struct fc_els_flogi *) status_buffer->payload.data;
 177         zfcp_fc_incoming_wwpn(req, plogi->fl_wwpn);
 178 }
 179
 180 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 181 {
 182         struct fsf_status_read_buffer *status_buffer =
 183                 (struct fsf_status_read_buffer *)req->data;
 184         struct fc_els_logo *logo =
 185                 (struct fc_els_logo *) status_buffer->payload.data;
 186
 187         zfcp_fc_incoming_wwpn(req, logo->fl_n_port_wwn);
 188 }
 189
 190 /**
 191  * zfcp_fc_incoming_els - handle incoming ELS
 192  * @fsf_req - request which contains incoming ELS
 193  */
 194 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 195 {
 196         struct fsf_status_read_buffer *status_buffer =
 197                 (struct fsf_status_read_buffer *) fsf_req->data;
 198         unsigned int els_type = status_buffer->payload.data[0];
 199
 200         zfcp_dbf_san_incoming_els(fsf_req);
 201         if (els_type == ELS_PLOGI)
 202                 zfcp_fc_incoming_plogi(fsf_req);
 203         else if (els_type == ELS_LOGO)
 204                 zfcp_fc_incoming_logo(fsf_req);
 205         else if (els_type == ELS_RSCN)
 206                 zfcp_fc_incoming_rscn(fsf_req);
 207 }
 208
 209 static void zfcp_fc_ns_gid_pn_eval(void *data)
 210 {
 211         struct zfcp_fc_gid_pn *gid_pn = data;
 212         struct zfcp_fsf_ct_els *ct = &gid_pn->ct;
 213         struct zfcp_fc_gid_pn_req *gid_pn_req = sg_virt(ct->req);
 214         struct zfcp_fc_gid_pn_resp *gid_pn_resp = sg_virt(ct->resp);
 215         struct zfcp_port *port = gid_pn->port;
 216
 217         if (ct->status)
 218                 return;
 219         if (gid_pn_resp->ct_hdr.ct_cmd != FC_FS_ACC)
 220                 return;
 221
 222         /* paranoia */
 223         if (gid_pn_req->gid_pn.fn_wwpn != port->wwpn)
 224                 return;
 225         /* looks like a valid d_id */
 226         port->d_id = ntoh24(gid_pn_resp->gid_pn.fp_fid);
 227 }
 228
 229 static void zfcp_fc_complete(void *data)
 230 {
 231         complete(data);
 232 }
 233
 234 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
 235                                      struct zfcp_fc_gid_pn *gid_pn)
 236 {
 237         struct zfcp_adapter *adapter = port->adapter;
 238         DECLARE_COMPLETION_ONSTACK(completion);
 239         int ret;
 240
 241         /* setup parameters for send generic command */
 242         gid_pn->port = port;
 243         gid_pn->ct.handler = zfcp_fc_complete;
 244         gid_pn->ct.handler_data = &completion;
 245         gid_pn->ct.req = &gid_pn->sg_req;
 246         gid_pn->ct.resp = &gid_pn->sg_resp;
 247         sg_init_one(&gid_pn->sg_req, &gid_pn->gid_pn_req,
 248                     sizeof(struct zfcp_fc_gid_pn_req));
 249         sg_init_one(&gid_pn->sg_resp, &gid_pn->gid_pn_resp,
 250                     sizeof(struct zfcp_fc_gid_pn_resp));
 251
 252         /* setup nameserver request */
 253         gid_pn->gid_pn_req.ct_hdr.ct_rev = FC_CT_REV;
 254         gid_pn->gid_pn_req.ct_hdr.ct_fs_type = FC_FST_DIR;
 255         gid_pn->gid_pn_req.ct_hdr.ct_fs_subtype = FC_NS_SUBTYPE;
 256         gid_pn->gid_pn_req.ct_hdr.ct_options = 0;
 257         gid_pn->gid_pn_req.ct_hdr.ct_cmd = FC_NS_GID_PN;
 258         gid_pn->gid_pn_req.ct_hdr.ct_mr_size = ZFCP_FC_CT_SIZE_PAGE / 4;
 259         gid_pn->gid_pn_req.gid_pn.fn_wwpn = port->wwpn;
 260
 261         ret = zfcp_fsf_send_ct(&adapter->gs->ds, &gid_pn->ct,
 262                                adapter->pool.gid_pn_req,
 263                                ZFCP_FC_CTELS_TMO);
 264         if (!ret) {
 265                 wait_for_completion(&completion);
 266                 zfcp_fc_ns_gid_pn_eval(gid_pn);
 267         }
 268         return ret;
 269 }
 270
 271 /**
 272  * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
 273  * @port: port where GID_PN request is needed
 274  * return: -ENOMEM on error, 0 otherwise
 275  */
 276 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
 277 {
 278         int ret;
 279         struct zfcp_fc_gid_pn *gid_pn;
 280         struct zfcp_adapter *adapter = port->adapter;
 281
 282         gid_pn = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC);
 283         if (!gid_pn)
 284                 return -ENOMEM;
 285
 286         memset(gid_pn, 0, sizeof(*gid_pn));
 287
 288         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 289         if (ret)
 290                 goto out;
 291
 292         ret = zfcp_fc_ns_gid_pn_request(port, gid_pn);
 293
 294         zfcp_fc_wka_port_put(&adapter->gs->ds);
 295 out:
 296         mempool_free(gid_pn, adapter->pool.gid_pn);
 297         return ret;
 298 }
 299
 300 void zfcp_fc_port_did_lookup(struct work_struct *work)
 301 {
 302         int ret;
 303         struct zfcp_port *port = container_of(work, struct zfcp_port,
 304                                               gid_pn_work);
 305
 306         ret = zfcp_fc_ns_gid_pn(port);
 307         if (ret) {
 308                 /* could not issue gid_pn for some reason */
 309                 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1", NULL);
 310                 goto out;
 311         }
 312
 313         if (!port->d_id) {
 314                 zfcp_erp_port_failed(port, "fcgpn_2", NULL);
 315                 goto out;
 316         }
 317
 318         zfcp_erp_port_reopen(port, 0, "fcgpn_3", NULL);
 319 out:
 320         put_device(&port->dev);
 321 }
 322
 323 /**
 324  * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request
 325  * @port: The zfcp_port to lookup the d_id for.
 326  */
 327 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)
 328 {
 329         get_device(&port->dev);
 330         if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))
 331                 put_device(&port->dev);
 332 }
 333
 334 /**
 335  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 336  * @port: zfcp_port structure
 337  * @plogi: plogi payload
 338  *
 339  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 340  */
 341 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi)
 342 {
 343         if (plogi->fl_wwpn != port->wwpn) {
 344                 port->d_id = 0;
 345                 dev_warn(&port->adapter->ccw_device->dev,
 346                          "A port opened with WWPN 0x%016Lx returned data that "
 347                          "identifies it as WWPN 0x%016Lx\n",
 348                          (unsigned long long) port->wwpn,
 349                          (unsigned long long) plogi->fl_wwpn);
 350                 return;
 351         }
 352
 353         port->wwnn = plogi->fl_wwnn;
 354         port->maxframe_size = plogi->fl_csp.sp_bb_data;
 355
 356         if (plogi->fl_cssp[0].cp_class & FC_CPC_VALID)
 357                 port->supported_classes |= FC_COS_CLASS1;
 358         if (plogi->fl_cssp[1].cp_class & FC_CPC_VALID)
 359                 port->supported_classes |= FC_COS_CLASS2;
 360         if (plogi->fl_cssp[2].cp_class & FC_CPC_VALID)
 361                 port->supported_classes |= FC_COS_CLASS3;
 362         if (plogi->fl_cssp[3].cp_class & FC_CPC_VALID)
 363                 port->supported_classes |= FC_COS_CLASS4;
 364 }
 365
 366 static void zfcp_fc_adisc_handler(void *data)
 367 {
 368         struct zfcp_fc_els_adisc *adisc = data;
 369         struct zfcp_port *port = adisc->els.port;
 370         struct fc_els_adisc *adisc_resp = &adisc->adisc_resp;
 371
 372         if (adisc->els.status) {
 373                 /* request rejected or timed out */
 374                 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 375                                             "fcadh_1", NULL);
 376                 goto out;
 377         }
 378
 379         if (!port->wwnn)
 380                 port->wwnn = adisc_resp->adisc_wwnn;
 381
 382         if ((port->wwpn != adisc_resp->adisc_wwpn) ||
 383             !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 384                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 385                                      "fcadh_2", NULL);
 386                 goto out;
 387         }
 388
 389         /* port is good, unblock rport without going through erp */
 390         zfcp_scsi_schedule_rport_register(port);
 391  out:
 392         atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 393         put_device(&port->dev);
 394         kmem_cache_free(zfcp_data.adisc_cache, adisc);
 395 }
 396
 397 static int zfcp_fc_adisc(struct zfcp_port *port)
 398 {
 399         struct zfcp_fc_els_adisc *adisc;
 400         struct zfcp_adapter *adapter = port->adapter;
 401         int ret;
 402
 403         adisc = kmem_cache_zalloc(zfcp_data.adisc_cache, GFP_ATOMIC);
 404         if (!adisc)
 405                 return -ENOMEM;
 406
 407         adisc->els.port = port;
 408         adisc->els.req = &adisc->req;
 409         adisc->els.resp = &adisc->resp;
 410         sg_init_one(adisc->els.req, &adisc->adisc_req,
 411                     sizeof(struct fc_els_adisc));
 412         sg_init_one(adisc->els.resp, &adisc->adisc_resp,
 413                     sizeof(struct fc_els_adisc));
 414
 415         adisc->els.handler = zfcp_fc_adisc_handler;
 416         adisc->els.handler_data = adisc;
 417
 418         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 419            without FC-AL-2 capability, so we don't set it */
 420         adisc->adisc_req.adisc_wwpn = fc_host_port_name(adapter->scsi_host);
 421         adisc->adisc_req.adisc_wwnn = fc_host_node_name(adapter->scsi_host);
 422         adisc->adisc_req.adisc_cmd = ELS_ADISC;
 423         hton24(adisc->adisc_req.adisc_port_id,
 424                fc_host_port_id(adapter->scsi_host));
 425
 426         ret = zfcp_fsf_send_els(adapter, port->d_id, &adisc->els,
 427                                 ZFCP_FC_CTELS_TMO);
 428         if (ret)
 429                 kmem_cache_free(zfcp_data.adisc_cache, adisc);
 430
 431         return ret;
 432 }
 433
 434 void zfcp_fc_link_test_work(struct work_struct *work)
 435 {
 436         struct zfcp_port *port =
 437                 container_of(work, struct zfcp_port, test_link_work);
 438         int retval;
 439
 440         get_device(&port->dev);
 441         port->rport_task = RPORT_DEL;
 442         zfcp_scsi_rport_work(&port->rport_work);
 443
 444         /* only issue one test command at one time per port */
 445         if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
 446                 goto out;
 447
 448         atomic_set_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 449
 450         retval = zfcp_fc_adisc(port);
 451         if (retval == 0)
 452                 return;
 453
 454         /* send of ADISC was not possible */
 455         atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 456         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1", NULL);
 457
 458 out:
 459         put_device(&port->dev);
 460 }
 461
 462 /**
 463  * zfcp_fc_test_link - lightweight link test procedure
 464  * @port: port to be tested
 465  *
 466  * Test status of a link to a remote port using the ELS command ADISC.
 467  * If there is a problem with the remote port, error recovery steps
 468  * will be triggered.
 469  */
 470 void zfcp_fc_test_link(struct zfcp_port *port)
 471 {
 472         get_device(&port->dev);
 473         if (!queue_work(port->adapter->work_queue, &port->test_link_work))
 474                 put_device(&port->dev);
 475 }
 476
 477 static void zfcp_free_sg_env(struct zfcp_fc_gpn_ft *gpn_ft, int buf_num)
 478 {
 479         struct scatterlist *sg = &gpn_ft->sg_req;
 480
 481         kmem_cache_free(zfcp_data.gpn_ft_cache, sg_virt(sg));
 482         zfcp_sg_free_table(gpn_ft->sg_resp, buf_num);
 483
 484         kfree(gpn_ft);
 485 }
 486
 487 static struct zfcp_fc_gpn_ft *zfcp_alloc_sg_env(int buf_num)
 488 {
 489         struct zfcp_fc_gpn_ft *gpn_ft;
 490         struct zfcp_fc_gpn_ft_req *req;
 491
 492         gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
 493         if (!gpn_ft)
 494                 return NULL;
 495
 496         req = kmem_cache_zalloc(zfcp_data.gpn_ft_cache, GFP_KERNEL);
 497         if (!req) {
 498                 kfree(gpn_ft);
 499                 gpn_ft = NULL;
 500                 goto out;
 501         }
 502         sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
 503
 504         if (zfcp_sg_setup_table(gpn_ft->sg_resp, buf_num)) {
 505                 zfcp_free_sg_env(gpn_ft, buf_num);
 506                 gpn_ft = NULL;
 507         }
 508 out:
 509         return gpn_ft;
 510 }
 511
 512
 513 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_gpn_ft *gpn_ft,
 514                                struct zfcp_adapter *adapter, int max_bytes)
 515 {
 516         struct zfcp_fsf_ct_els *ct = &gpn_ft->ct;
 517         struct zfcp_fc_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
 518         DECLARE_COMPLETION_ONSTACK(completion);
 519         int ret;
 520
 521         /* prepare CT IU for GPN_FT */
 522         req->ct_hdr.ct_rev = FC_CT_REV;
 523         req->ct_hdr.ct_fs_type = FC_FST_DIR;
 524         req->ct_hdr.ct_fs_subtype = FC_NS_SUBTYPE;
 525         req->ct_hdr.ct_options = 0;
 526         req->ct_hdr.ct_cmd = FC_NS_GPN_FT;
 527         req->ct_hdr.ct_mr_size = max_bytes / 4;
 528         req->gpn_ft.fn_domain_id_scope = 0;
 529         req->gpn_ft.fn_area_id_scope = 0;
 530         req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;
 531
 532         /* prepare zfcp_send_ct */
 533         ct->handler = zfcp_fc_complete;
 534         ct->handler_data = &completion;
 535         ct->req = &gpn_ft->sg_req;
 536         ct->resp = gpn_ft->sg_resp;
 537
 538         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct, NULL,
 539                                ZFCP_FC_CTELS_TMO);
 540         if (!ret)
 541                 wait_for_completion(&completion);
 542         return ret;
 543 }
 544
 545 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
 546 {
 547         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 548                 return;
 549
 550         atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
 551
 552         if ((port->supported_classes != 0) ||
 553             !list_empty(&port->unit_list))
 554                 return;
 555
 556         list_move_tail(&port->list, lh);
 557 }
 558
 559 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_gpn_ft *gpn_ft,
 560                                struct zfcp_adapter *adapter, int max_entries)
 561 {
 562         struct zfcp_fsf_ct_els *ct = &gpn_ft->ct;
 563         struct scatterlist *sg = gpn_ft->sg_resp;
 564         struct fc_ct_hdr *hdr = sg_virt(sg);
 565         struct fc_gpn_ft_resp *acc = sg_virt(sg);
 566         struct zfcp_port *port, *tmp;
 567         unsigned long flags;
 568         LIST_HEAD(remove_lh);
 569         u32 d_id;
 570         int ret = 0, x, last = 0;
 571
 572         if (ct->status)
 573                 return -EIO;
 574
 575         if (hdr->ct_cmd != FC_FS_ACC) {
 576                 if (hdr->ct_reason == FC_BA_RJT_UNABLE)
 577                         return -EAGAIN; /* might be a temporary condition */
 578                 return -EIO;
 579         }
 580
 581         if (hdr->ct_mr_size) {
 582                 dev_warn(&adapter->ccw_device->dev,
 583                          "The name server reported %d words residual data\n",
 584                          hdr->ct_mr_size);
 585                 return -E2BIG;
 586         }
 587
 588         /* first entry is the header */
 589         for (x = 1; x < max_entries && !last; x++) {
 590                 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
 591                         acc++;
 592                 else
 593                         acc = sg_virt(++sg);
 594
 595                 last = acc->fp_flags & FC_NS_FID_LAST;
 596                 d_id = ntoh24(acc->fp_fid);
 597
 598                 /* don't attach ports with a well known address */
 599                 if (d_id >= FC_FID_WELL_KNOWN_BASE)
 600                         continue;
 601                 /* skip the adapter's port and known remote ports */
 602                 if (acc->fp_wwpn == fc_host_port_name(adapter->scsi_host))
 603                         continue;
 604
 605                 port = zfcp_port_enqueue(adapter, acc->fp_wwpn,
 606                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 607                 if (!IS_ERR(port))
 608                         zfcp_erp_port_reopen(port, 0, "fcegpf1", NULL);
 609                 else if (PTR_ERR(port) != -EEXIST)
 610                         ret = PTR_ERR(port);
 611         }
 612
 613         zfcp_erp_wait(adapter);
 614         write_lock_irqsave(&adapter->port_list_lock, flags);
 615         list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
 616                 zfcp_fc_validate_port(port, &remove_lh);
 617         write_unlock_irqrestore(&adapter->port_list_lock, flags);
 618
 619         list_for_each_entry_safe(port, tmp, &remove_lh, list) {
 620                 zfcp_erp_port_shutdown(port, 0, "fcegpf2", NULL);
 621                 zfcp_device_unregister(&port->dev, &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         struct fc_bsg_reply *jr = job->reply;
 675
 676         jr->reply_payload_rcv_len = job->reply_payload.payload_len;
 677         jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
 678         jr->result = zfcp_ct_els->status ? -EIO : 0;
 679         job->job_done(job);
 680 }
 681
 682 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct fc_bsg_job *job)
 683 {
 684         u32 preamble_word1;
 685         u8 gs_type;
 686         struct zfcp_adapter *adapter;
 687
 688         preamble_word1 = job->request->rqst_data.r_ct.preamble_word1;
 689         gs_type = (preamble_word1 & 0xff000000) >> 24;
 690
 691         adapter = (struct zfcp_adapter *) job->shost->hostdata[0];
 692
 693         switch (gs_type) {
 694         case FC_FST_ALIAS:
 695                 return &adapter->gs->as;
 696         case FC_FST_MGMT:
 697                 return &adapter->gs->ms;
 698         case FC_FST_TIME:
 699                 return &adapter->gs->ts;
 700                 break;
 701         case FC_FST_DIR:
 702                 return &adapter->gs->ds;
 703                 break;
 704         default:
 705                 return NULL;
 706         }
 707 }
 708
 709 static void zfcp_fc_ct_job_handler(void *data)
 710 {
 711         struct fc_bsg_job *job = data;
 712         struct zfcp_fc_wka_port *wka_port;
 713
 714         wka_port = zfcp_fc_job_wka_port(job);
 715         zfcp_fc_wka_port_put(wka_port);
 716
 717         zfcp_fc_ct_els_job_handler(data);
 718 }
 719
 720 static int zfcp_fc_exec_els_job(struct fc_bsg_job *job,
 721                                 struct zfcp_adapter *adapter)
 722 {
 723         struct zfcp_fsf_ct_els *els = job->dd_data;
 724         struct fc_rport *rport = job->rport;
 725         struct zfcp_port *port;
 726         u32 d_id;
 727
 728         if (rport) {
 729                 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 730                 if (!port)
 731                         return -EINVAL;
 732
 733                 d_id = port->d_id;
 734                 put_device(&port->dev);
 735         } else
 736                 d_id = ntoh24(job->request->rqst_data.h_els.port_id);
 737
 738         els->handler = zfcp_fc_ct_els_job_handler;
 739         return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ);
 740 }
 741
 742 static int zfcp_fc_exec_ct_job(struct fc_bsg_job *job,
 743                                struct zfcp_adapter *adapter)
 744 {
 745         int ret;
 746         struct zfcp_fsf_ct_els *ct = job->dd_data;
 747         struct zfcp_fc_wka_port *wka_port;
 748
 749         wka_port = zfcp_fc_job_wka_port(job);
 750         if (!wka_port)
 751                 return -EINVAL;
 752
 753         ret = zfcp_fc_wka_port_get(wka_port);
 754         if (ret)
 755                 return ret;
 756
 757         ct->handler = zfcp_fc_ct_job_handler;
 758         ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ);
 759         if (ret)
 760                 zfcp_fc_wka_port_put(wka_port);
 761
 762         return ret;
 763 }
 764
 765 int zfcp_fc_exec_bsg_job(struct fc_bsg_job *job)
 766 {
 767         struct Scsi_Host *shost;
 768         struct zfcp_adapter *adapter;
 769         struct zfcp_fsf_ct_els *ct_els = job->dd_data;
 770
 771         shost = job->rport ? rport_to_shost(job->rport) : job->shost;
 772         adapter = (struct zfcp_adapter *)shost->hostdata[0];
 773
 774         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
 775                 return -EINVAL;
 776
 777         ct_els->req = job->request_payload.sg_list;
 778         ct_els->resp = job->reply_payload.sg_list;
 779         ct_els->handler_data = job;
 780
 781         switch (job->request->msgcode) {
 782         case FC_BSG_RPT_ELS:
 783         case FC_BSG_HST_ELS_NOLOGIN:
 784                 return zfcp_fc_exec_els_job(job, adapter);
 785         case FC_BSG_RPT_CT:
 786         case FC_BSG_HST_CT:
 787                 return zfcp_fc_exec_ct_job(job, adapter);
 788         default:
 789                 return -EINVAL;
 790         }
 791 }
 792
 793 int zfcp_fc_timeout_bsg_job(struct fc_bsg_job *job)
 794 {
 795         /* hardware tracks timeout, reset bsg timeout to not interfere */
 796         return -EAGAIN;
 797 }
 798
 799 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
 800 {
 801         struct zfcp_fc_wka_ports *wka_ports;
 802
 803         wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL);
 804         if (!wka_ports)
 805                 return -ENOMEM;
 806
 807         adapter->gs = wka_ports;
 808         zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);
 809         zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);
 810         zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);
 811         zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);
 812
 813         return 0;
 814 }
 815
 816 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)
 817 {
 818         kfree(adapter->gs);
 819         adapter->gs = NULL;
 820 }
 821