drivers/s390/scsi/zfcp_fc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * zfcp device driver
   4  *
   5  * Fibre Channel related functions for the zfcp device driver.
   6  *
   7  * Copyright IBM Corp. 2008, 2017
   8  */
   9
  10 #define KMSG_COMPONENT "zfcp"
  11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13 #include <linux/types.h>
  14 #include <linux/slab.h>
  15 #include <linux/utsname.h>
  16 #include <linux/random.h>
  17 #include <linux/bsg-lib.h>
  18 #include <scsi/fc/fc_els.h>
  19 #include <scsi/libfc.h>
  20 #include "zfcp_ext.h"
  21 #include "zfcp_fc.h"
  22
  23 struct kmem_cache *zfcp_fc_req_cache;
  24
  25 static u32 zfcp_fc_rscn_range_mask[] = {
  26         [ELS_ADDR_FMT_PORT]             = 0xFFFFFF,
  27         [ELS_ADDR_FMT_AREA]             = 0xFFFF00,
  28         [ELS_ADDR_FMT_DOM]              = 0xFF0000,
  29         [ELS_ADDR_FMT_FAB]              = 0x000000,
  30 };
  31
  32 static bool no_auto_port_rescan;
  33 module_param(no_auto_port_rescan, bool, 0600);
  34 MODULE_PARM_DESC(no_auto_port_rescan,
  35                  "no automatic port_rescan (default off)");
  36
  37 static unsigned int port_scan_backoff = 500;
  38 module_param(port_scan_backoff, uint, 0600);
  39 MODULE_PARM_DESC(port_scan_backoff,
  40         "upper limit of port scan random backoff in msecs (default 500)");
  41
  42 static unsigned int port_scan_ratelimit = 60000;
  43 module_param(port_scan_ratelimit, uint, 0600);
  44 MODULE_PARM_DESC(port_scan_ratelimit,
  45         "minimum interval between port scans in msecs (default 60000)");
  46
  47 unsigned int zfcp_fc_port_scan_backoff(void)
  48 {
  49         if (!port_scan_backoff)
  50                 return 0;
  51         return get_random_int() % port_scan_backoff;
  52 }
  53
  54 static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter)
  55 {
  56         unsigned long interval = msecs_to_jiffies(port_scan_ratelimit);
  57         unsigned long backoff = msecs_to_jiffies(zfcp_fc_port_scan_backoff());
  58
  59         adapter->next_port_scan = jiffies + interval + backoff;
  60 }
  61
  62 static void zfcp_fc_port_scan(struct zfcp_adapter *adapter)
  63 {
  64         unsigned long now = jiffies;
  65         unsigned long next = adapter->next_port_scan;
  66         unsigned long delay = 0, max;
  67
  68         /* delay only needed within waiting period */
  69         if (time_before(now, next)) {
  70                 delay = next - now;
  71                 /* paranoia: never ever delay scans longer than specified */
  72                 max = msecs_to_jiffies(port_scan_ratelimit + port_scan_backoff);
  73                 delay = min(delay, max);
  74         }
  75
  76         queue_delayed_work(adapter->work_queue, &adapter->scan_work, delay);
  77 }
  78
  79 void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter)
  80 {
  81         if (no_auto_port_rescan)
  82                 return;
  83
  84         zfcp_fc_port_scan(adapter);
  85 }
  86
  87 void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter)
  88 {
  89         if (!no_auto_port_rescan)
  90                 return;
  91
  92         zfcp_fc_port_scan(adapter);
  93 }
  94
  95 /**
  96  * zfcp_fc_post_event - post event to userspace via fc_transport
  97  * @work: work struct with enqueued events
  98  */
  99 void zfcp_fc_post_event(struct work_struct *work)
 100 {
 101         struct zfcp_fc_event *event = NULL, *tmp = NULL;
 102         LIST_HEAD(tmp_lh);
 103         struct zfcp_fc_events *events = container_of(work,
 104                                         struct zfcp_fc_events, work);
 105         struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter,
 106                                                 events);
 107
 108         spin_lock_bh(&events->list_lock);
 109         list_splice_init(&events->list, &tmp_lh);
 110         spin_unlock_bh(&events->list_lock);
 111
 112         list_for_each_entry_safe(event, tmp, &tmp_lh, list) {
 113                 fc_host_post_event(adapter->scsi_host, fc_get_event_number(),
 114                                    event->code, event->data);
 115                 list_del(&event->list);
 116                 kfree(event);
 117         }
 118 }
 119
 120 /**
 121  * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context
 122  * @adapter: The adapter where to enqueue the event
 123  * @event_code: The event code (as defined in fc_host_event_code in
 124  *              scsi_transport_fc.h)
 125  * @event_data: The event data (e.g. n_port page in case of els)
 126  */
 127 void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter,
 128                            enum fc_host_event_code event_code, u32 event_data)
 129 {
 130         struct zfcp_fc_event *event;
 131
 132         event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC);
 133         if (!event)
 134                 return;
 135
 136         event->code = event_code;
 137         event->data = event_data;
 138
 139         spin_lock(&adapter->events.list_lock);
 140         list_add_tail(&event->list, &adapter->events.list);
 141         spin_unlock(&adapter->events.list_lock);
 142
 143         queue_work(adapter->work_queue, &adapter->events.work);
 144 }
 145
 146 static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port)
 147 {
 148         if (mutex_lock_interruptible(&wka_port->mutex))
 149                 return -ERESTARTSYS;
 150
 151         if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE ||
 152             wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) {
 153                 wka_port->status = ZFCP_FC_WKA_PORT_OPENING;
 154                 if (zfcp_fsf_open_wka_port(wka_port))
 155                         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 156         }
 157
 158         mutex_unlock(&wka_port->mutex);
 159
 160         wait_event(wka_port->completion_wq,
 161                    wka_port->status == ZFCP_FC_WKA_PORT_ONLINE ||
 162                    wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
 163
 164         if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) {
 165                 atomic_inc(&wka_port->refcount);
 166                 return 0;
 167         }
 168         return -EIO;
 169 }
 170
 171 static void zfcp_fc_wka_port_offline(struct work_struct *work)
 172 {
 173         struct delayed_work *dw = to_delayed_work(work);
 174         struct zfcp_fc_wka_port *wka_port =
 175                         container_of(dw, struct zfcp_fc_wka_port, work);
 176
 177         mutex_lock(&wka_port->mutex);
 178         if ((atomic_read(&wka_port->refcount) != 0) ||
 179             (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE))
 180                 goto out;
 181
 182         wka_port->status = ZFCP_FC_WKA_PORT_CLOSING;
 183         if (zfcp_fsf_close_wka_port(wka_port)) {
 184                 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 185                 wake_up(&wka_port->completion_wq);
 186         }
 187 out:
 188         mutex_unlock(&wka_port->mutex);
 189 }
 190
 191 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port)
 192 {
 193         if (atomic_dec_return(&wka_port->refcount) != 0)
 194                 return;
 195         /* wait 10 milliseconds, other reqs might pop in */
 196         schedule_delayed_work(&wka_port->work, HZ / 100);
 197 }
 198
 199 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id,
 200                                   struct zfcp_adapter *adapter)
 201 {
 202         init_waitqueue_head(&wka_port->completion_wq);
 203
 204         wka_port->adapter = adapter;
 205         wka_port->d_id = d_id;
 206
 207         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
 208         atomic_set(&wka_port->refcount, 0);
 209         mutex_init(&wka_port->mutex);
 210         INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline);
 211 }
 212
 213 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka)
 214 {
 215         cancel_delayed_work_sync(&wka->work);
 216         mutex_lock(&wka->mutex);
 217         wka->status = ZFCP_FC_WKA_PORT_OFFLINE;
 218         mutex_unlock(&wka->mutex);
 219 }
 220
 221 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs)
 222 {
 223         if (!gs)
 224                 return;
 225         zfcp_fc_wka_port_force_offline(&gs->ms);
 226         zfcp_fc_wka_port_force_offline(&gs->ts);
 227         zfcp_fc_wka_port_force_offline(&gs->ds);
 228         zfcp_fc_wka_port_force_offline(&gs->as);
 229 }
 230
 231 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
 232                                    struct fc_els_rscn_page *page)
 233 {
 234         unsigned long flags;
 235         struct zfcp_adapter *adapter = fsf_req->adapter;
 236         struct zfcp_port *port;
 237
 238         read_lock_irqsave(&adapter->port_list_lock, flags);
 239         list_for_each_entry(port, &adapter->port_list, list) {
 240                 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range))
 241                         zfcp_fc_test_link(port);
 242                 if (!port->d_id)
 243                         zfcp_erp_port_reopen(port,
 244                                              ZFCP_STATUS_COMMON_ERP_FAILED,
 245                                              "fcrscn1");
 246         }
 247         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 248 }
 249
 250 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 251 {
 252         struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 253         struct fc_els_rscn *head;
 254         struct fc_els_rscn_page *page;
 255         u16 i;
 256         u16 no_entries;
 257         unsigned int afmt;
 258
 259         head = (struct fc_els_rscn *) status_buffer->payload.data;
 260         page = (struct fc_els_rscn_page *) head;
 261
 262         /* see FC-FS */
 263         no_entries = be16_to_cpu(head->rscn_plen) /
 264                 sizeof(struct fc_els_rscn_page);
 265
 266         for (i = 1; i < no_entries; i++) {
 267                 /* skip head and start with 1st element */
 268                 page++;
 269                 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
 270                 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
 271                                        page);
 272                 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,
 273                                       *(u32 *)page);
 274         }
 275         zfcp_fc_conditional_port_scan(fsf_req->adapter);
 276 }
 277
 278 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 279 {
 280         unsigned long flags;
 281         struct zfcp_adapter *adapter = req->adapter;
 282         struct zfcp_port *port;
 283
 284         read_lock_irqsave(&adapter->port_list_lock, flags);
 285         list_for_each_entry(port, &adapter->port_list, list)
 286                 if (port->wwpn == wwpn) {
 287                         zfcp_erp_port_forced_reopen(port, 0, "fciwwp1");
 288                         break;
 289                 }
 290         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 291 }
 292
 293 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 294 {
 295         struct fsf_status_read_buffer *status_buffer;
 296         struct fc_els_flogi *plogi;
 297
 298         status_buffer = (struct fsf_status_read_buffer *) req->data;
 299         plogi = (struct fc_els_flogi *) status_buffer->payload.data;
 300         zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn));
 301 }
 302
 303 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 304 {
 305         struct fsf_status_read_buffer *status_buffer =
 306                 (struct fsf_status_read_buffer *)req->data;
 307         struct fc_els_logo *logo =
 308                 (struct fc_els_logo *) status_buffer->payload.data;
 309
 310         zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn));
 311 }
 312
 313 /**
 314  * zfcp_fc_incoming_els - handle incoming ELS
 315  * @fsf_req: request which contains incoming ELS
 316  */
 317 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 318 {
 319         struct fsf_status_read_buffer *status_buffer =
 320                 (struct fsf_status_read_buffer *) fsf_req->data;
 321         unsigned int els_type = status_buffer->payload.data[0];
 322
 323         zfcp_dbf_san_in_els("fciels1", fsf_req);
 324         if (els_type == ELS_PLOGI)
 325                 zfcp_fc_incoming_plogi(fsf_req);
 326         else if (els_type == ELS_LOGO)
 327                 zfcp_fc_incoming_logo(fsf_req);
 328         else if (els_type == ELS_RSCN)
 329                 zfcp_fc_incoming_rscn(fsf_req);
 330 }
 331
 332 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req)
 333 {
 334         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 335         struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 336
 337         if (ct_els->status)
 338                 return;
 339         if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC))
 340                 return;
 341
 342         /* looks like a valid d_id */
 343         ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid);
 344 }
 345
 346 static void zfcp_fc_complete(void *data)
 347 {
 348         complete(data);
 349 }
 350
 351 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size)
 352 {
 353         ct_hdr->ct_rev = FC_CT_REV;
 354         ct_hdr->ct_fs_type = FC_FST_DIR;
 355         ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE;
 356         ct_hdr->ct_cmd = cpu_to_be16(cmd);
 357         ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4);
 358 }
 359
 360 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
 361                                      struct zfcp_fc_req *fc_req)
 362 {
 363         struct zfcp_adapter *adapter = port->adapter;
 364         DECLARE_COMPLETION_ONSTACK(completion);
 365         struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req;
 366         struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 367         int ret;
 368
 369         /* setup parameters for send generic command */
 370         fc_req->ct_els.port = port;
 371         fc_req->ct_els.handler = zfcp_fc_complete;
 372         fc_req->ct_els.handler_data = &completion;
 373         fc_req->ct_els.req = &fc_req->sg_req;
 374         fc_req->ct_els.resp = &fc_req->sg_rsp;
 375         sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req));
 376         sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp));
 377
 378         zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr,
 379                            FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE);
 380         gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn);
 381
 382         ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els,
 383                                adapter->pool.gid_pn_req,
 384                                ZFCP_FC_CTELS_TMO);
 385         if (!ret) {
 386                 wait_for_completion(&completion);
 387                 zfcp_fc_ns_gid_pn_eval(fc_req);
 388         }
 389         return ret;
 390 }
 391
 392 /**
 393  * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request
 394  * @port: port where GID_PN request is needed
 395  * return: -ENOMEM on error, 0 otherwise
 396  */
 397 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
 398 {
 399         int ret;
 400         struct zfcp_fc_req *fc_req;
 401         struct zfcp_adapter *adapter = port->adapter;
 402
 403         fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC);
 404         if (!fc_req)
 405                 return -ENOMEM;
 406
 407         memset(fc_req, 0, sizeof(*fc_req));
 408
 409         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 410         if (ret)
 411                 goto out;
 412
 413         ret = zfcp_fc_ns_gid_pn_request(port, fc_req);
 414
 415         zfcp_fc_wka_port_put(&adapter->gs->ds);
 416 out:
 417         mempool_free(fc_req, adapter->pool.gid_pn);
 418         return ret;
 419 }
 420
 421 void zfcp_fc_port_did_lookup(struct work_struct *work)
 422 {
 423         int ret;
 424         struct zfcp_port *port = container_of(work, struct zfcp_port,
 425                                               gid_pn_work);
 426
 427         set_worker_desc("zgidpn%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */
 428         ret = zfcp_fc_ns_gid_pn(port);
 429         if (ret) {
 430                 /* could not issue gid_pn for some reason */
 431                 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1");
 432                 goto out;
 433         }
 434
 435         if (!port->d_id) {
 436                 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
 437                 goto out;
 438         }
 439
 440         zfcp_erp_port_reopen(port, 0, "fcgpn_3");
 441 out:
 442         put_device(&port->dev);
 443 }
 444
 445 /**
 446  * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request
 447  * @port: The zfcp_port to lookup the d_id for.
 448  */
 449 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)
 450 {
 451         get_device(&port->dev);
 452         if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))
 453                 put_device(&port->dev);
 454 }
 455
 456 /**
 457  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 458  * @port: zfcp_port structure
 459  * @plogi: plogi payload
 460  *
 461  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 462  */
 463 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi)
 464 {
 465         if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) {
 466                 port->d_id = 0;
 467                 dev_warn(&port->adapter->ccw_device->dev,
 468                          "A port opened with WWPN 0x%016Lx returned data that "
 469                          "identifies it as WWPN 0x%016Lx\n",
 470                          (unsigned long long) port->wwpn,
 471                          (unsigned long long) be64_to_cpu(plogi->fl_wwpn));
 472                 return;
 473         }
 474
 475         port->wwnn = be64_to_cpu(plogi->fl_wwnn);
 476         port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data);
 477
 478         if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID))
 479                 port->supported_classes |= FC_COS_CLASS1;
 480         if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID))
 481                 port->supported_classes |= FC_COS_CLASS2;
 482         if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID))
 483                 port->supported_classes |= FC_COS_CLASS3;
 484         if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID))
 485                 port->supported_classes |= FC_COS_CLASS4;
 486 }
 487
 488 static void zfcp_fc_adisc_handler(void *data)
 489 {
 490         struct zfcp_fc_req *fc_req = data;
 491         struct zfcp_port *port = fc_req->ct_els.port;
 492         struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp;
 493
 494         if (fc_req->ct_els.status) {
 495                 /* request rejected or timed out */
 496                 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 497                                             "fcadh_1");
 498                 goto out;
 499         }
 500
 501         if (!port->wwnn)
 502                 port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn);
 503
 504         if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) ||
 505             !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 506                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 507                                      "fcadh_2");
 508                 goto out;
 509         }
 510
 511         /* port is good, unblock rport without going through erp */
 512         zfcp_scsi_schedule_rport_register(port);
 513  out:
 514         atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 515         put_device(&port->dev);
 516         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 517 }
 518
 519 static int zfcp_fc_adisc(struct zfcp_port *port)
 520 {
 521         struct zfcp_fc_req *fc_req;
 522         struct zfcp_adapter *adapter = port->adapter;
 523         struct Scsi_Host *shost = adapter->scsi_host;
 524         int ret;
 525
 526         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC);
 527         if (!fc_req)
 528                 return -ENOMEM;
 529
 530         fc_req->ct_els.port = port;
 531         fc_req->ct_els.req = &fc_req->sg_req;
 532         fc_req->ct_els.resp = &fc_req->sg_rsp;
 533         sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req,
 534                     sizeof(struct fc_els_adisc));
 535         sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp,
 536                     sizeof(struct fc_els_adisc));
 537
 538         fc_req->ct_els.handler = zfcp_fc_adisc_handler;
 539         fc_req->ct_els.handler_data = fc_req;
 540
 541         /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 542            without FC-AL-2 capability, so we don't set it */
 543         fc_req->u.adisc.req.adisc_wwpn = cpu_to_be64(fc_host_port_name(shost));
 544         fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(fc_host_node_name(shost));
 545         fc_req->u.adisc.req.adisc_cmd = ELS_ADISC;
 546         hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost));
 547
 548         ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els,
 549                                 ZFCP_FC_CTELS_TMO);
 550         if (ret)
 551                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 552
 553         return ret;
 554 }
 555
 556 void zfcp_fc_link_test_work(struct work_struct *work)
 557 {
 558         struct zfcp_port *port =
 559                 container_of(work, struct zfcp_port, test_link_work);
 560         int retval;
 561
 562         set_worker_desc("zadisc%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */
 563         get_device(&port->dev);
 564         port->rport_task = RPORT_DEL;
 565         zfcp_scsi_rport_work(&port->rport_work);
 566
 567         /* only issue one test command at one time per port */
 568         if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
 569                 goto out;
 570
 571         atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 572
 573         retval = zfcp_fc_adisc(port);
 574         if (retval == 0)
 575                 return;
 576
 577         /* send of ADISC was not possible */
 578         atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 579         zfcp_erp_port_forced_reopen(port, 0, "fcltwk1");
 580
 581 out:
 582         put_device(&port->dev);
 583 }
 584
 585 /**
 586  * zfcp_fc_test_link - lightweight link test procedure
 587  * @port: port to be tested
 588  *
 589  * Test status of a link to a remote port using the ELS command ADISC.
 590  * If there is a problem with the remote port, error recovery steps
 591  * will be triggered.
 592  */
 593 void zfcp_fc_test_link(struct zfcp_port *port)
 594 {
 595         get_device(&port->dev);
 596         if (!queue_work(port->adapter->work_queue, &port->test_link_work))
 597                 put_device(&port->dev);
 598 }
 599
 600 /**
 601  * zfcp_fc_sg_free_table - free memory used by scatterlists
 602  * @sg: pointer to scatterlist
 603  * @count: number of scatterlist which are to be free'ed
 604  * the scatterlist are expected to reference pages always
 605  */
 606 static void zfcp_fc_sg_free_table(struct scatterlist *sg, int count)
 607 {
 608         int i;
 609
 610         for (i = 0; i < count; i++, sg++)
 611                 if (sg)
 612                         free_page((unsigned long) sg_virt(sg));
 613                 else
 614                         break;
 615 }
 616
 617 /**
 618  * zfcp_fc_sg_setup_table - init scatterlist and allocate, assign buffers
 619  * @sg: pointer to struct scatterlist
 620  * @count: number of scatterlists which should be assigned with buffers
 621  * of size page
 622  *
 623  * Returns: 0 on success, -ENOMEM otherwise
 624  */
 625 static int zfcp_fc_sg_setup_table(struct scatterlist *sg, int count)
 626 {
 627         void *addr;
 628         int i;
 629
 630         sg_init_table(sg, count);
 631         for (i = 0; i < count; i++, sg++) {
 632                 addr = (void *) get_zeroed_page(GFP_KERNEL);
 633                 if (!addr) {
 634                         zfcp_fc_sg_free_table(sg, i);
 635                         return -ENOMEM;
 636                 }
 637                 sg_set_buf(sg, addr, PAGE_SIZE);
 638         }
 639         return 0;
 640 }
 641
 642 static struct zfcp_fc_req *zfcp_fc_alloc_sg_env(int buf_num)
 643 {
 644         struct zfcp_fc_req *fc_req;
 645
 646         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 647         if (!fc_req)
 648                 return NULL;
 649
 650         if (zfcp_fc_sg_setup_table(&fc_req->sg_rsp, buf_num)) {
 651                 kmem_cache_free(zfcp_fc_req_cache, fc_req);
 652                 return NULL;
 653         }
 654
 655         sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req,
 656                     sizeof(struct zfcp_fc_gpn_ft_req));
 657
 658         return fc_req;
 659 }
 660
 661 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req,
 662                                struct zfcp_adapter *adapter, int max_bytes)
 663 {
 664         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 665         struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req;
 666         DECLARE_COMPLETION_ONSTACK(completion);
 667         int ret;
 668
 669         zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes);
 670         req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;
 671
 672         ct_els->handler = zfcp_fc_complete;
 673         ct_els->handler_data = &completion;
 674         ct_els->req = &fc_req->sg_req;
 675         ct_els->resp = &fc_req->sg_rsp;
 676
 677         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 678                                ZFCP_FC_CTELS_TMO);
 679         if (!ret)
 680                 wait_for_completion(&completion);
 681         return ret;
 682 }
 683
 684 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
 685 {
 686         if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 687                 return;
 688
 689         atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status);
 690
 691         if ((port->supported_classes != 0) ||
 692             !list_empty(&port->unit_list))
 693                 return;
 694
 695         list_move_tail(&port->list, lh);
 696 }
 697
 698 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,
 699                                struct zfcp_adapter *adapter, int max_entries)
 700 {
 701         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 702         struct scatterlist *sg = &fc_req->sg_rsp;
 703         struct fc_ct_hdr *hdr = sg_virt(sg);
 704         struct fc_gpn_ft_resp *acc = sg_virt(sg);
 705         struct zfcp_port *port, *tmp;
 706         unsigned long flags;
 707         LIST_HEAD(remove_lh);
 708         u32 d_id;
 709         int ret = 0, x, last = 0;
 710
 711         if (ct_els->status)
 712                 return -EIO;
 713
 714         if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) {
 715                 if (hdr->ct_reason == FC_FS_RJT_UNABL)
 716                         return -EAGAIN; /* might be a temporary condition */
 717                 return -EIO;
 718         }
 719
 720         if (hdr->ct_mr_size) {
 721                 dev_warn(&adapter->ccw_device->dev,
 722                          "The name server reported %d words residual data\n",
 723                          hdr->ct_mr_size);
 724                 return -E2BIG;
 725         }
 726
 727         /* first entry is the header */
 728         for (x = 1; x < max_entries && !last; x++) {
 729                 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
 730                         acc++;
 731                 else
 732                         acc = sg_virt(++sg);
 733
 734                 last = acc->fp_flags & FC_NS_FID_LAST;
 735                 d_id = ntoh24(acc->fp_fid);
 736
 737                 /* don't attach ports with a well known address */
 738                 if (d_id >= FC_FID_WELL_KNOWN_BASE)
 739                         continue;
 740                 /* skip the adapter's port and known remote ports */
 741                 if (be64_to_cpu(acc->fp_wwpn) ==
 742                     fc_host_port_name(adapter->scsi_host))
 743                         continue;
 744
 745                 port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn),
 746                                          ZFCP_STATUS_COMMON_NOESC, d_id);
 747                 if (!IS_ERR(port))
 748                         zfcp_erp_port_reopen(port, 0, "fcegpf1");
 749                 else if (PTR_ERR(port) != -EEXIST)
 750                         ret = PTR_ERR(port);
 751         }
 752
 753         zfcp_erp_wait(adapter);
 754         write_lock_irqsave(&adapter->port_list_lock, flags);
 755         list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
 756                 zfcp_fc_validate_port(port, &remove_lh);
 757         write_unlock_irqrestore(&adapter->port_list_lock, flags);
 758
 759         list_for_each_entry_safe(port, tmp, &remove_lh, list) {
 760                 zfcp_erp_port_shutdown(port, 0, "fcegpf2");
 761                 device_unregister(&port->dev);
 762         }
 763
 764         return ret;
 765 }
 766
 767 /**
 768  * zfcp_fc_scan_ports - scan remote ports and attach new ports
 769  * @work: reference to scheduled work
 770  */
 771 void zfcp_fc_scan_ports(struct work_struct *work)
 772 {
 773         struct delayed_work *dw = to_delayed_work(work);
 774         struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter,
 775                                                     scan_work);
 776         int ret, i;
 777         struct zfcp_fc_req *fc_req;
 778         int chain, max_entries, buf_num, max_bytes;
 779
 780         zfcp_fc_port_scan_time(adapter);
 781
 782         chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 783         buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1;
 784         max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE;
 785         max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE;
 786
 787         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 788             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 789                 return;
 790
 791         if (zfcp_fc_wka_port_get(&adapter->gs->ds))
 792                 return;
 793
 794         fc_req = zfcp_fc_alloc_sg_env(buf_num);
 795         if (!fc_req)
 796                 goto out;
 797
 798         for (i = 0; i < 3; i++) {
 799                 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes);
 800                 if (!ret) {
 801                         ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries);
 802                         if (ret == -EAGAIN)
 803                                 ssleep(1);
 804                         else
 805                                 break;
 806                 }
 807         }
 808         zfcp_fc_sg_free_table(&fc_req->sg_rsp, buf_num);
 809         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 810 out:
 811         zfcp_fc_wka_port_put(&adapter->gs->ds);
 812 }
 813
 814 static int zfcp_fc_gspn(struct zfcp_adapter *adapter,
 815                         struct zfcp_fc_req *fc_req)
 816 {
 817         DECLARE_COMPLETION_ONSTACK(completion);
 818         char devno[] = "DEVNO:";
 819         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 820         struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req;
 821         struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp;
 822         int ret;
 823
 824         zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID,
 825                            FC_SYMBOLIC_NAME_SIZE);
 826         hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host));
 827
 828         sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req));
 829         sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp));
 830
 831         ct_els->handler = zfcp_fc_complete;
 832         ct_els->handler_data = &completion;
 833         ct_els->req = &fc_req->sg_req;
 834         ct_els->resp = &fc_req->sg_rsp;
 835
 836         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 837                                ZFCP_FC_CTELS_TMO);
 838         if (ret)
 839                 return ret;
 840
 841         wait_for_completion(&completion);
 842         if (ct_els->status)
 843                 return ct_els->status;
 844
 845         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV &&
 846             !(strstr(gspn_rsp->gspn.fp_name, devno)))
 847                 snprintf(fc_host_symbolic_name(adapter->scsi_host),
 848                          FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s",
 849                          gspn_rsp->gspn.fp_name, devno,
 850                          dev_name(&adapter->ccw_device->dev),
 851                          init_utsname()->nodename);
 852         else
 853                 strlcpy(fc_host_symbolic_name(adapter->scsi_host),
 854                         gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE);
 855
 856         return 0;
 857 }
 858
 859 static void zfcp_fc_rspn(struct zfcp_adapter *adapter,
 860                          struct zfcp_fc_req *fc_req)
 861 {
 862         DECLARE_COMPLETION_ONSTACK(completion);
 863         struct Scsi_Host *shost = adapter->scsi_host;
 864         struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 865         struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req;
 866         struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp;
 867         int ret, len;
 868
 869         zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID,
 870                            FC_SYMBOLIC_NAME_SIZE);
 871         hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost));
 872         len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost),
 873                       FC_SYMBOLIC_NAME_SIZE);
 874         rspn_req->rspn.fr_name_len = len;
 875
 876         sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req));
 877         sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp));
 878
 879         ct_els->handler = zfcp_fc_complete;
 880         ct_els->handler_data = &completion;
 881         ct_els->req = &fc_req->sg_req;
 882         ct_els->resp = &fc_req->sg_rsp;
 883
 884         ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 885                                ZFCP_FC_CTELS_TMO);
 886         if (!ret)
 887                 wait_for_completion(&completion);
 888 }
 889
 890 /**
 891  * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name
 892  * @work: ns_up_work of the adapter where to update the symbolic port name
 893  *
 894  * Retrieve the current symbolic port name that may have been set by
 895  * the hardware using the GSPN request and update the fc_host
 896  * symbolic_name sysfs attribute. When running in NPIV mode (and hence
 897  * the port name is unique for this system), update the symbolic port
 898  * name to add Linux specific information and update the FC nameserver
 899  * using the RSPN request.
 900  */
 901 void zfcp_fc_sym_name_update(struct work_struct *work)
 902 {
 903         struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
 904                                                     ns_up_work);
 905         int ret;
 906         struct zfcp_fc_req *fc_req;
 907
 908         if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 909             fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 910                 return;
 911
 912         fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 913         if (!fc_req)
 914                 return;
 915
 916         ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 917         if (ret)
 918                 goto out_free;
 919
 920         ret = zfcp_fc_gspn(adapter, fc_req);
 921         if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 922                 goto out_ds_put;
 923
 924         memset(fc_req, 0, sizeof(*fc_req));
 925         zfcp_fc_rspn(adapter, fc_req);
 926
 927 out_ds_put:
 928         zfcp_fc_wka_port_put(&adapter->gs->ds);
 929 out_free:
 930         kmem_cache_free(zfcp_fc_req_cache, fc_req);
 931 }
 932
 933 static void zfcp_fc_ct_els_job_handler(void *data)
 934 {
 935         struct bsg_job *job = data;
 936         struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data;
 937         struct fc_bsg_reply *jr = job->reply;
 938
 939         jr->reply_payload_rcv_len = job->reply_payload.payload_len;
 940         jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
 941         jr->result = zfcp_ct_els->status ? -EIO : 0;
 942         bsg_job_done(job, jr->result, jr->reply_payload_rcv_len);
 943 }
 944
 945 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job)
 946 {
 947         u32 preamble_word1;
 948         u8 gs_type;
 949         struct zfcp_adapter *adapter;
 950         struct fc_bsg_request *bsg_request = job->request;
 951         struct fc_rport *rport = fc_bsg_to_rport(job);
 952         struct Scsi_Host *shost;
 953
 954         preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1;
 955         gs_type = (preamble_word1 & 0xff000000) >> 24;
 956
 957         shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
 958         adapter = (struct zfcp_adapter *) shost->hostdata[0];
 959
 960         switch (gs_type) {
 961         case FC_FST_ALIAS:
 962                 return &adapter->gs->as;
 963         case FC_FST_MGMT:
 964                 return &adapter->gs->ms;
 965         case FC_FST_TIME:
 966                 return &adapter->gs->ts;
 967                 break;
 968         case FC_FST_DIR:
 969                 return &adapter->gs->ds;
 970                 break;
 971         default:
 972                 return NULL;
 973         }
 974 }
 975
 976 static void zfcp_fc_ct_job_handler(void *data)
 977 {
 978         struct bsg_job *job = data;
 979         struct zfcp_fc_wka_port *wka_port;
 980
 981         wka_port = zfcp_fc_job_wka_port(job);
 982         zfcp_fc_wka_port_put(wka_port);
 983
 984         zfcp_fc_ct_els_job_handler(data);
 985 }
 986
 987 static int zfcp_fc_exec_els_job(struct bsg_job *job,
 988                                 struct zfcp_adapter *adapter)
 989 {
 990         struct zfcp_fsf_ct_els *els = job->dd_data;
 991         struct fc_rport *rport = fc_bsg_to_rport(job);
 992         struct fc_bsg_request *bsg_request = job->request;
 993         struct zfcp_port *port;
 994         u32 d_id;
 995
 996         if (rport) {
 997                 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 998                 if (!port)
 999                         return -EINVAL;
1000
1001                 d_id = port->d_id;
1002                 put_device(&port->dev);
1003         } else
1004                 d_id = ntoh24(bsg_request->rqst_data.h_els.port_id);
1005
1006         els->handler = zfcp_fc_ct_els_job_handler;
1007         return zfcp_fsf_send_els(adapter, d_id, els, job->timeout / HZ);
1008 }
1009
1010 static int zfcp_fc_exec_ct_job(struct bsg_job *job,
1011                                struct zfcp_adapter *adapter)
1012 {
1013         int ret;
1014         struct zfcp_fsf_ct_els *ct = job->dd_data;
1015         struct zfcp_fc_wka_port *wka_port;
1016
1017         wka_port = zfcp_fc_job_wka_port(job);
1018         if (!wka_port)
1019                 return -EINVAL;
1020
1021         ret = zfcp_fc_wka_port_get(wka_port);
1022         if (ret)
1023                 return ret;
1024
1025         ct->handler = zfcp_fc_ct_job_handler;
1026         ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->timeout / HZ);
1027         if (ret)
1028                 zfcp_fc_wka_port_put(wka_port);
1029
1030         return ret;
1031 }
1032
1033 int zfcp_fc_exec_bsg_job(struct bsg_job *job)
1034 {
1035         struct Scsi_Host *shost;
1036         struct zfcp_adapter *adapter;
1037         struct zfcp_fsf_ct_els *ct_els = job->dd_data;
1038         struct fc_bsg_request *bsg_request = job->request;
1039         struct fc_rport *rport = fc_bsg_to_rport(job);
1040
1041         shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
1042         adapter = (struct zfcp_adapter *)shost->hostdata[0];
1043
1044         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
1045                 return -EINVAL;
1046
1047         ct_els->req = job->request_payload.sg_list;
1048         ct_els->resp = job->reply_payload.sg_list;
1049         ct_els->handler_data = job;
1050
1051         switch (bsg_request->msgcode) {
1052         case FC_BSG_RPT_ELS:
1053         case FC_BSG_HST_ELS_NOLOGIN:
1054                 return zfcp_fc_exec_els_job(job, adapter);
1055         case FC_BSG_RPT_CT:
1056         case FC_BSG_HST_CT:
1057                 return zfcp_fc_exec_ct_job(job, adapter);
1058         default:
1059                 return -EINVAL;
1060         }
1061 }
1062
1063 int zfcp_fc_timeout_bsg_job(struct bsg_job *job)
1064 {
1065         /* hardware tracks timeout, reset bsg timeout to not interfere */
1066         return -EAGAIN;
1067 }
1068
1069 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
1070 {
1071         struct zfcp_fc_wka_ports *wka_ports;
1072
1073         wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL);
1074         if (!wka_ports)
1075                 return -ENOMEM;
1076
1077         adapter->gs = wka_ports;
1078         zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);
1079         zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);
1080         zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);
1081         zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);
1082
1083         return 0;
1084 }
1085
1086 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)
1087 {
1088         kfree(adapter->gs);
1089         adapter->gs = NULL;
1090 }
1091