linux/drivers/s390/scsi/zfcp_fc.c
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   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
  23struct kmem_cache *zfcp_fc_req_cache;
  24
  25static 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
  32static bool no_auto_port_rescan;
  33module_param(no_auto_port_rescan, bool, 0600);
  34MODULE_PARM_DESC(no_auto_port_rescan,
  35                 "no automatic port_rescan (default off)");
  36
  37static unsigned int port_scan_backoff = 500;
  38module_param(port_scan_backoff, uint, 0600);
  39MODULE_PARM_DESC(port_scan_backoff,
  40        "upper limit of port scan random backoff in msecs (default 500)");
  41
  42static unsigned int port_scan_ratelimit = 60000;
  43module_param(port_scan_ratelimit, uint, 0600);
  44MODULE_PARM_DESC(port_scan_ratelimit,
  45        "minimum interval between port scans in msecs (default 60000)");
  46
  47unsigned int zfcp_fc_port_scan_backoff(void)
  48{
  49        if (!port_scan_backoff)
  50                return 0;
  51        return prandom_u32_max(port_scan_backoff);
  52}
  53
  54static 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
  62static 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
  79void 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
  87void 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 */
  99void 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 */
 127void 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
 146static 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
 171static 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        }
 187out:
 188        mutex_unlock(&wka_port->mutex);
 189}
 190
 191static 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
 199static 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
 213static 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
 221void 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
 231static 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        }
 243        read_unlock_irqrestore(&adapter->port_list_lock, flags);
 244}
 245
 246static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
 247{
 248        struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
 249        struct zfcp_adapter *adapter = fsf_req->adapter;
 250        struct fc_els_rscn *head;
 251        struct fc_els_rscn_page *page;
 252        u16 i;
 253        u16 no_entries;
 254        unsigned int afmt;
 255
 256        head = (struct fc_els_rscn *) status_buffer->payload.data;
 257        page = (struct fc_els_rscn_page *) head;
 258
 259        /* see FC-FS */
 260        no_entries = be16_to_cpu(head->rscn_plen) /
 261                sizeof(struct fc_els_rscn_page);
 262
 263        if (no_entries > 1) {
 264                /* handle failed ports */
 265                unsigned long flags;
 266                struct zfcp_port *port;
 267
 268                read_lock_irqsave(&adapter->port_list_lock, flags);
 269                list_for_each_entry(port, &adapter->port_list, list) {
 270                        if (port->d_id)
 271                                continue;
 272                        zfcp_erp_port_reopen(port,
 273                                             ZFCP_STATUS_COMMON_ERP_FAILED,
 274                                             "fcrscn1");
 275                }
 276                read_unlock_irqrestore(&adapter->port_list_lock, flags);
 277        }
 278
 279        for (i = 1; i < no_entries; i++) {
 280                /* skip head and start with 1st element */
 281                page++;
 282                afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
 283                _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
 284                                       page);
 285                zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,
 286                                      *(u32 *)page);
 287        }
 288        zfcp_fc_conditional_port_scan(fsf_req->adapter);
 289}
 290
 291static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
 292{
 293        unsigned long flags;
 294        struct zfcp_adapter *adapter = req->adapter;
 295        struct zfcp_port *port;
 296
 297        read_lock_irqsave(&adapter->port_list_lock, flags);
 298        list_for_each_entry(port, &adapter->port_list, list)
 299                if (port->wwpn == wwpn) {
 300                        zfcp_erp_port_forced_reopen(port, 0, "fciwwp1");
 301                        break;
 302                }
 303        read_unlock_irqrestore(&adapter->port_list_lock, flags);
 304}
 305
 306static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
 307{
 308        struct fsf_status_read_buffer *status_buffer;
 309        struct fc_els_flogi *plogi;
 310
 311        status_buffer = (struct fsf_status_read_buffer *) req->data;
 312        plogi = (struct fc_els_flogi *) status_buffer->payload.data;
 313        zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn));
 314}
 315
 316static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
 317{
 318        struct fsf_status_read_buffer *status_buffer =
 319                (struct fsf_status_read_buffer *)req->data;
 320        struct fc_els_logo *logo =
 321                (struct fc_els_logo *) status_buffer->payload.data;
 322
 323        zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn));
 324}
 325
 326/**
 327 * zfcp_fc_incoming_els - handle incoming ELS
 328 * @fsf_req: request which contains incoming ELS
 329 */
 330void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
 331{
 332        struct fsf_status_read_buffer *status_buffer =
 333                (struct fsf_status_read_buffer *) fsf_req->data;
 334        unsigned int els_type = status_buffer->payload.data[0];
 335
 336        zfcp_dbf_san_in_els("fciels1", fsf_req);
 337        if (els_type == ELS_PLOGI)
 338                zfcp_fc_incoming_plogi(fsf_req);
 339        else if (els_type == ELS_LOGO)
 340                zfcp_fc_incoming_logo(fsf_req);
 341        else if (els_type == ELS_RSCN)
 342                zfcp_fc_incoming_rscn(fsf_req);
 343}
 344
 345static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req)
 346{
 347        struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 348        struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 349
 350        if (ct_els->status)
 351                return;
 352        if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC))
 353                return;
 354
 355        /* looks like a valid d_id */
 356        ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid);
 357}
 358
 359static void zfcp_fc_complete(void *data)
 360{
 361        complete(data);
 362}
 363
 364static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size)
 365{
 366        ct_hdr->ct_rev = FC_CT_REV;
 367        ct_hdr->ct_fs_type = FC_FST_DIR;
 368        ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE;
 369        ct_hdr->ct_cmd = cpu_to_be16(cmd);
 370        ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4);
 371}
 372
 373static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
 374                                     struct zfcp_fc_req *fc_req)
 375{
 376        struct zfcp_adapter *adapter = port->adapter;
 377        DECLARE_COMPLETION_ONSTACK(completion);
 378        struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req;
 379        struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
 380        int ret;
 381
 382        /* setup parameters for send generic command */
 383        fc_req->ct_els.port = port;
 384        fc_req->ct_els.handler = zfcp_fc_complete;
 385        fc_req->ct_els.handler_data = &completion;
 386        fc_req->ct_els.req = &fc_req->sg_req;
 387        fc_req->ct_els.resp = &fc_req->sg_rsp;
 388        sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req));
 389        sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp));
 390
 391        zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr,
 392                           FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE);
 393        gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn);
 394
 395        ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els,
 396                               adapter->pool.gid_pn_req,
 397                               ZFCP_FC_CTELS_TMO);
 398        if (!ret) {
 399                wait_for_completion(&completion);
 400                zfcp_fc_ns_gid_pn_eval(fc_req);
 401        }
 402        return ret;
 403}
 404
 405/**
 406 * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request
 407 * @port: port where GID_PN request is needed
 408 * return: -ENOMEM on error, 0 otherwise
 409 */
 410static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
 411{
 412        int ret;
 413        struct zfcp_fc_req *fc_req;
 414        struct zfcp_adapter *adapter = port->adapter;
 415
 416        fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC);
 417        if (!fc_req)
 418                return -ENOMEM;
 419
 420        memset(fc_req, 0, sizeof(*fc_req));
 421
 422        ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 423        if (ret)
 424                goto out;
 425
 426        ret = zfcp_fc_ns_gid_pn_request(port, fc_req);
 427
 428        zfcp_fc_wka_port_put(&adapter->gs->ds);
 429out:
 430        mempool_free(fc_req, adapter->pool.gid_pn);
 431        return ret;
 432}
 433
 434void zfcp_fc_port_did_lookup(struct work_struct *work)
 435{
 436        int ret;
 437        struct zfcp_port *port = container_of(work, struct zfcp_port,
 438                                              gid_pn_work);
 439
 440        set_worker_desc("zgidpn%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */
 441        ret = zfcp_fc_ns_gid_pn(port);
 442        if (ret) {
 443                /* could not issue gid_pn for some reason */
 444                zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1");
 445                goto out;
 446        }
 447
 448        if (!port->d_id) {
 449                zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
 450                goto out;
 451        }
 452
 453        zfcp_erp_port_reopen(port, 0, "fcgpn_3");
 454out:
 455        put_device(&port->dev);
 456}
 457
 458/**
 459 * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request
 460 * @port: The zfcp_port to lookup the d_id for.
 461 */
 462void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)
 463{
 464        get_device(&port->dev);
 465        if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))
 466                put_device(&port->dev);
 467}
 468
 469/**
 470 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
 471 * @port: zfcp_port structure
 472 * @plogi: plogi payload
 473 *
 474 * Evaluate PLOGI playload and copy important fields into zfcp_port structure
 475 */
 476void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi)
 477{
 478        if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) {
 479                port->d_id = 0;
 480                dev_warn(&port->adapter->ccw_device->dev,
 481                         "A port opened with WWPN 0x%016Lx returned data that "
 482                         "identifies it as WWPN 0x%016Lx\n",
 483                         (unsigned long long) port->wwpn,
 484                         (unsigned long long) be64_to_cpu(plogi->fl_wwpn));
 485                return;
 486        }
 487
 488        port->wwnn = be64_to_cpu(plogi->fl_wwnn);
 489        port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data);
 490
 491        if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID))
 492                port->supported_classes |= FC_COS_CLASS1;
 493        if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID))
 494                port->supported_classes |= FC_COS_CLASS2;
 495        if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID))
 496                port->supported_classes |= FC_COS_CLASS3;
 497        if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID))
 498                port->supported_classes |= FC_COS_CLASS4;
 499}
 500
 501static void zfcp_fc_adisc_handler(void *data)
 502{
 503        struct zfcp_fc_req *fc_req = data;
 504        struct zfcp_port *port = fc_req->ct_els.port;
 505        struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp;
 506
 507        if (fc_req->ct_els.status) {
 508                /* request rejected or timed out */
 509                zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 510                                            "fcadh_1");
 511                goto out;
 512        }
 513
 514        if (!port->wwnn)
 515                port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn);
 516
 517        if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) ||
 518            !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
 519                zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
 520                                     "fcadh_2");
 521                goto out;
 522        }
 523
 524        /* port is good, unblock rport without going through erp */
 525        zfcp_scsi_schedule_rport_register(port);
 526 out:
 527        atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 528        put_device(&port->dev);
 529        kmem_cache_free(zfcp_fc_req_cache, fc_req);
 530}
 531
 532static int zfcp_fc_adisc(struct zfcp_port *port)
 533{
 534        struct zfcp_fc_req *fc_req;
 535        struct zfcp_adapter *adapter = port->adapter;
 536        struct Scsi_Host *shost = adapter->scsi_host;
 537        int ret;
 538
 539        fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC);
 540        if (!fc_req)
 541                return -ENOMEM;
 542
 543        fc_req->ct_els.port = port;
 544        fc_req->ct_els.req = &fc_req->sg_req;
 545        fc_req->ct_els.resp = &fc_req->sg_rsp;
 546        sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req,
 547                    sizeof(struct fc_els_adisc));
 548        sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp,
 549                    sizeof(struct fc_els_adisc));
 550
 551        fc_req->ct_els.handler = zfcp_fc_adisc_handler;
 552        fc_req->ct_els.handler_data = fc_req;
 553
 554        /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
 555           without FC-AL-2 capability, so we don't set it */
 556        fc_req->u.adisc.req.adisc_wwpn = cpu_to_be64(fc_host_port_name(shost));
 557        fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(fc_host_node_name(shost));
 558        fc_req->u.adisc.req.adisc_cmd = ELS_ADISC;
 559        hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost));
 560
 561        ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els,
 562                                ZFCP_FC_CTELS_TMO);
 563        if (ret)
 564                kmem_cache_free(zfcp_fc_req_cache, fc_req);
 565
 566        return ret;
 567}
 568
 569void zfcp_fc_link_test_work(struct work_struct *work)
 570{
 571        struct zfcp_port *port =
 572                container_of(work, struct zfcp_port, test_link_work);
 573        int retval;
 574
 575        set_worker_desc("zadisc%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */
 576        get_device(&port->dev);
 577        port->rport_task = RPORT_DEL;
 578        zfcp_scsi_rport_work(&port->rport_work);
 579
 580        /* only issue one test command at one time per port */
 581        if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
 582                goto out;
 583
 584        atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 585
 586        retval = zfcp_fc_adisc(port);
 587        if (retval == 0)
 588                return;
 589
 590        /* send of ADISC was not possible */
 591        atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
 592        zfcp_erp_port_forced_reopen(port, 0, "fcltwk1");
 593
 594out:
 595        put_device(&port->dev);
 596}
 597
 598/**
 599 * zfcp_fc_test_link - lightweight link test procedure
 600 * @port: port to be tested
 601 *
 602 * Test status of a link to a remote port using the ELS command ADISC.
 603 * If there is a problem with the remote port, error recovery steps
 604 * will be triggered.
 605 */
 606void zfcp_fc_test_link(struct zfcp_port *port)
 607{
 608        get_device(&port->dev);
 609        if (!queue_work(port->adapter->work_queue, &port->test_link_work))
 610                put_device(&port->dev);
 611}
 612
 613/**
 614 * zfcp_fc_sg_free_table - free memory used by scatterlists
 615 * @sg: pointer to scatterlist
 616 * @count: number of scatterlist which are to be free'ed
 617 * the scatterlist are expected to reference pages always
 618 */
 619static void zfcp_fc_sg_free_table(struct scatterlist *sg, int count)
 620{
 621        int i;
 622
 623        for (i = 0; i < count; i++, sg = sg_next(sg))
 624                if (sg)
 625                        free_page((unsigned long) sg_virt(sg));
 626                else
 627                        break;
 628}
 629
 630/**
 631 * zfcp_fc_sg_setup_table - init scatterlist and allocate, assign buffers
 632 * @sg: pointer to struct scatterlist
 633 * @count: number of scatterlists which should be assigned with buffers
 634 * of size page
 635 *
 636 * Returns: 0 on success, -ENOMEM otherwise
 637 */
 638static int zfcp_fc_sg_setup_table(struct scatterlist *sg, int count)
 639{
 640        void *addr;
 641        int i;
 642
 643        sg_init_table(sg, count);
 644        for (i = 0; i < count; i++, sg = sg_next(sg)) {
 645                addr = (void *) get_zeroed_page(GFP_KERNEL);
 646                if (!addr) {
 647                        zfcp_fc_sg_free_table(sg, i);
 648                        return -ENOMEM;
 649                }
 650                sg_set_buf(sg, addr, PAGE_SIZE);
 651        }
 652        return 0;
 653}
 654
 655static struct zfcp_fc_req *zfcp_fc_alloc_sg_env(int buf_num)
 656{
 657        struct zfcp_fc_req *fc_req;
 658
 659        fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 660        if (!fc_req)
 661                return NULL;
 662
 663        if (zfcp_fc_sg_setup_table(&fc_req->sg_rsp, buf_num)) {
 664                kmem_cache_free(zfcp_fc_req_cache, fc_req);
 665                return NULL;
 666        }
 667
 668        sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req,
 669                    sizeof(struct zfcp_fc_gpn_ft_req));
 670
 671        return fc_req;
 672}
 673
 674static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req,
 675                               struct zfcp_adapter *adapter, int max_bytes)
 676{
 677        struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 678        struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req;
 679        DECLARE_COMPLETION_ONSTACK(completion);
 680        int ret;
 681
 682        zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes);
 683        req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;
 684
 685        ct_els->handler = zfcp_fc_complete;
 686        ct_els->handler_data = &completion;
 687        ct_els->req = &fc_req->sg_req;
 688        ct_els->resp = &fc_req->sg_rsp;
 689
 690        ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 691                               ZFCP_FC_CTELS_TMO);
 692        if (!ret)
 693                wait_for_completion(&completion);
 694        return ret;
 695}
 696
 697static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
 698{
 699        if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
 700                return;
 701
 702        atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status);
 703
 704        if ((port->supported_classes != 0) ||
 705            !list_empty(&port->unit_list))
 706                return;
 707
 708        list_move_tail(&port->list, lh);
 709}
 710
 711static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,
 712                               struct zfcp_adapter *adapter, int max_entries)
 713{
 714        struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 715        struct scatterlist *sg = &fc_req->sg_rsp;
 716        struct fc_ct_hdr *hdr = sg_virt(sg);
 717        struct fc_gpn_ft_resp *acc = sg_virt(sg);
 718        struct zfcp_port *port, *tmp;
 719        unsigned long flags;
 720        LIST_HEAD(remove_lh);
 721        u32 d_id;
 722        int ret = 0, x, last = 0;
 723
 724        if (ct_els->status)
 725                return -EIO;
 726
 727        if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) {
 728                if (hdr->ct_reason == FC_FS_RJT_UNABL)
 729                        return -EAGAIN; /* might be a temporary condition */
 730                return -EIO;
 731        }
 732
 733        if (hdr->ct_mr_size) {
 734                dev_warn(&adapter->ccw_device->dev,
 735                         "The name server reported %d words residual data\n",
 736                         hdr->ct_mr_size);
 737                return -E2BIG;
 738        }
 739
 740        /* first entry is the header */
 741        for (x = 1; x < max_entries && !last; x++) {
 742                if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
 743                        acc++;
 744                else
 745                        acc = sg_virt(++sg);
 746
 747                last = acc->fp_flags & FC_NS_FID_LAST;
 748                d_id = ntoh24(acc->fp_fid);
 749
 750                /* don't attach ports with a well known address */
 751                if (d_id >= FC_FID_WELL_KNOWN_BASE)
 752                        continue;
 753                /* skip the adapter's port and known remote ports */
 754                if (be64_to_cpu(acc->fp_wwpn) ==
 755                    fc_host_port_name(adapter->scsi_host))
 756                        continue;
 757
 758                port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn),
 759                                         ZFCP_STATUS_COMMON_NOESC, d_id);
 760                if (!IS_ERR(port))
 761                        zfcp_erp_port_reopen(port, 0, "fcegpf1");
 762                else if (PTR_ERR(port) != -EEXIST)
 763                        ret = PTR_ERR(port);
 764        }
 765
 766        zfcp_erp_wait(adapter);
 767        write_lock_irqsave(&adapter->port_list_lock, flags);
 768        list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
 769                zfcp_fc_validate_port(port, &remove_lh);
 770        write_unlock_irqrestore(&adapter->port_list_lock, flags);
 771
 772        list_for_each_entry_safe(port, tmp, &remove_lh, list) {
 773                zfcp_erp_port_shutdown(port, 0, "fcegpf2");
 774                device_unregister(&port->dev);
 775        }
 776
 777        return ret;
 778}
 779
 780/**
 781 * zfcp_fc_scan_ports - scan remote ports and attach new ports
 782 * @work: reference to scheduled work
 783 */
 784void zfcp_fc_scan_ports(struct work_struct *work)
 785{
 786        struct delayed_work *dw = to_delayed_work(work);
 787        struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter,
 788                                                    scan_work);
 789        int ret, i;
 790        struct zfcp_fc_req *fc_req;
 791        int chain, max_entries, buf_num, max_bytes;
 792
 793        zfcp_fc_port_scan_time(adapter);
 794
 795        chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
 796        buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1;
 797        max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE;
 798        max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE;
 799
 800        if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 801            fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 802                return;
 803
 804        if (zfcp_fc_wka_port_get(&adapter->gs->ds))
 805                return;
 806
 807        fc_req = zfcp_fc_alloc_sg_env(buf_num);
 808        if (!fc_req)
 809                goto out;
 810
 811        for (i = 0; i < 3; i++) {
 812                ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes);
 813                if (!ret) {
 814                        ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries);
 815                        if (ret == -EAGAIN)
 816                                ssleep(1);
 817                        else
 818                                break;
 819                }
 820        }
 821        zfcp_fc_sg_free_table(&fc_req->sg_rsp, buf_num);
 822        kmem_cache_free(zfcp_fc_req_cache, fc_req);
 823out:
 824        zfcp_fc_wka_port_put(&adapter->gs->ds);
 825}
 826
 827static int zfcp_fc_gspn(struct zfcp_adapter *adapter,
 828                        struct zfcp_fc_req *fc_req)
 829{
 830        DECLARE_COMPLETION_ONSTACK(completion);
 831        char devno[] = "DEVNO:";
 832        struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 833        struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req;
 834        struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp;
 835        int ret;
 836
 837        zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID,
 838                           FC_SYMBOLIC_NAME_SIZE);
 839        hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host));
 840
 841        sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req));
 842        sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp));
 843
 844        ct_els->handler = zfcp_fc_complete;
 845        ct_els->handler_data = &completion;
 846        ct_els->req = &fc_req->sg_req;
 847        ct_els->resp = &fc_req->sg_rsp;
 848
 849        ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 850                               ZFCP_FC_CTELS_TMO);
 851        if (ret)
 852                return ret;
 853
 854        wait_for_completion(&completion);
 855        if (ct_els->status)
 856                return ct_els->status;
 857
 858        if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV &&
 859            !(strstr(gspn_rsp->gspn.fp_name, devno)))
 860                snprintf(fc_host_symbolic_name(adapter->scsi_host),
 861                         FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s",
 862                         gspn_rsp->gspn.fp_name, devno,
 863                         dev_name(&adapter->ccw_device->dev),
 864                         init_utsname()->nodename);
 865        else
 866                strlcpy(fc_host_symbolic_name(adapter->scsi_host),
 867                        gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE);
 868
 869        return 0;
 870}
 871
 872static void zfcp_fc_rspn(struct zfcp_adapter *adapter,
 873                         struct zfcp_fc_req *fc_req)
 874{
 875        DECLARE_COMPLETION_ONSTACK(completion);
 876        struct Scsi_Host *shost = adapter->scsi_host;
 877        struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
 878        struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req;
 879        struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp;
 880        int ret, len;
 881
 882        zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID,
 883                           FC_SYMBOLIC_NAME_SIZE);
 884        hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost));
 885        len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost),
 886                      FC_SYMBOLIC_NAME_SIZE);
 887        rspn_req->rspn.fr_name_len = len;
 888
 889        sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req));
 890        sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp));
 891
 892        ct_els->handler = zfcp_fc_complete;
 893        ct_els->handler_data = &completion;
 894        ct_els->req = &fc_req->sg_req;
 895        ct_els->resp = &fc_req->sg_rsp;
 896
 897        ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
 898                               ZFCP_FC_CTELS_TMO);
 899        if (!ret)
 900                wait_for_completion(&completion);
 901}
 902
 903/**
 904 * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name
 905 * @work: ns_up_work of the adapter where to update the symbolic port name
 906 *
 907 * Retrieve the current symbolic port name that may have been set by
 908 * the hardware using the GSPN request and update the fc_host
 909 * symbolic_name sysfs attribute. When running in NPIV mode (and hence
 910 * the port name is unique for this system), update the symbolic port
 911 * name to add Linux specific information and update the FC nameserver
 912 * using the RSPN request.
 913 */
 914void zfcp_fc_sym_name_update(struct work_struct *work)
 915{
 916        struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
 917                                                    ns_up_work);
 918        int ret;
 919        struct zfcp_fc_req *fc_req;
 920
 921        if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
 922            fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 923                return;
 924
 925        fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
 926        if (!fc_req)
 927                return;
 928
 929        ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
 930        if (ret)
 931                goto out_free;
 932
 933        ret = zfcp_fc_gspn(adapter, fc_req);
 934        if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
 935                goto out_ds_put;
 936
 937        memset(fc_req, 0, sizeof(*fc_req));
 938        zfcp_fc_rspn(adapter, fc_req);
 939
 940out_ds_put:
 941        zfcp_fc_wka_port_put(&adapter->gs->ds);
 942out_free:
 943        kmem_cache_free(zfcp_fc_req_cache, fc_req);
 944}
 945
 946static void zfcp_fc_ct_els_job_handler(void *data)
 947{
 948        struct bsg_job *job = data;
 949        struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data;
 950        struct fc_bsg_reply *jr = job->reply;
 951
 952        jr->reply_payload_rcv_len = job->reply_payload.payload_len;
 953        jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
 954        jr->result = zfcp_ct_els->status ? -EIO : 0;
 955        bsg_job_done(job, jr->result, jr->reply_payload_rcv_len);
 956}
 957
 958static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job)
 959{
 960        u32 preamble_word1;
 961        u8 gs_type;
 962        struct zfcp_adapter *adapter;
 963        struct fc_bsg_request *bsg_request = job->request;
 964        struct fc_rport *rport = fc_bsg_to_rport(job);
 965        struct Scsi_Host *shost;
 966
 967        preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1;
 968        gs_type = (preamble_word1 & 0xff000000) >> 24;
 969
 970        shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
 971        adapter = (struct zfcp_adapter *) shost->hostdata[0];
 972
 973        switch (gs_type) {
 974        case FC_FST_ALIAS:
 975                return &adapter->gs->as;
 976        case FC_FST_MGMT:
 977                return &adapter->gs->ms;
 978        case FC_FST_TIME:
 979                return &adapter->gs->ts;
 980                break;
 981        case FC_FST_DIR:
 982                return &adapter->gs->ds;
 983                break;
 984        default:
 985                return NULL;
 986        }
 987}
 988
 989static void zfcp_fc_ct_job_handler(void *data)
 990{
 991        struct bsg_job *job = data;
 992        struct zfcp_fc_wka_port *wka_port;
 993
 994        wka_port = zfcp_fc_job_wka_port(job);
 995        zfcp_fc_wka_port_put(wka_port);
 996
 997        zfcp_fc_ct_els_job_handler(data);
 998}
 999
1000static int zfcp_fc_exec_els_job(struct bsg_job *job,
1001                                struct zfcp_adapter *adapter)
1002{
1003        struct zfcp_fsf_ct_els *els = job->dd_data;
1004        struct fc_rport *rport = fc_bsg_to_rport(job);
1005        struct fc_bsg_request *bsg_request = job->request;
1006        struct zfcp_port *port;
1007        u32 d_id;
1008
1009        if (rport) {
1010                port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
1011                if (!port)
1012                        return -EINVAL;
1013
1014                d_id = port->d_id;
1015                put_device(&port->dev);
1016        } else
1017                d_id = ntoh24(bsg_request->rqst_data.h_els.port_id);
1018
1019        els->handler = zfcp_fc_ct_els_job_handler;
1020        return zfcp_fsf_send_els(adapter, d_id, els, job->timeout / HZ);
1021}
1022
1023static int zfcp_fc_exec_ct_job(struct bsg_job *job,
1024                               struct zfcp_adapter *adapter)
1025{
1026        int ret;
1027        struct zfcp_fsf_ct_els *ct = job->dd_data;
1028        struct zfcp_fc_wka_port *wka_port;
1029
1030        wka_port = zfcp_fc_job_wka_port(job);
1031        if (!wka_port)
1032                return -EINVAL;
1033
1034        ret = zfcp_fc_wka_port_get(wka_port);
1035        if (ret)
1036                return ret;
1037
1038        ct->handler = zfcp_fc_ct_job_handler;
1039        ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->timeout / HZ);
1040        if (ret)
1041                zfcp_fc_wka_port_put(wka_port);
1042
1043        return ret;
1044}
1045
1046int zfcp_fc_exec_bsg_job(struct bsg_job *job)
1047{
1048        struct Scsi_Host *shost;
1049        struct zfcp_adapter *adapter;
1050        struct zfcp_fsf_ct_els *ct_els = job->dd_data;
1051        struct fc_bsg_request *bsg_request = job->request;
1052        struct fc_rport *rport = fc_bsg_to_rport(job);
1053
1054        shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
1055        adapter = (struct zfcp_adapter *)shost->hostdata[0];
1056
1057        if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
1058                return -EINVAL;
1059
1060        ct_els->req = job->request_payload.sg_list;
1061        ct_els->resp = job->reply_payload.sg_list;
1062        ct_els->handler_data = job;
1063
1064        switch (bsg_request->msgcode) {
1065        case FC_BSG_RPT_ELS:
1066        case FC_BSG_HST_ELS_NOLOGIN:
1067                return zfcp_fc_exec_els_job(job, adapter);
1068        case FC_BSG_RPT_CT:
1069        case FC_BSG_HST_CT:
1070                return zfcp_fc_exec_ct_job(job, adapter);
1071        default:
1072                return -EINVAL;
1073        }
1074}
1075
1076int zfcp_fc_timeout_bsg_job(struct bsg_job *job)
1077{
1078        /* hardware tracks timeout, reset bsg timeout to not interfere */
1079        return -EAGAIN;
1080}
1081
1082int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
1083{
1084        struct zfcp_fc_wka_ports *wka_ports;
1085
1086        wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL);
1087        if (!wka_ports)
1088                return -ENOMEM;
1089
1090        adapter->gs = wka_ports;
1091        zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);
1092        zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);
1093        zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);
1094        zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);
1095
1096        return 0;
1097}
1098
1099void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)
1100{
1101        kfree(adapter->gs);
1102        adapter->gs = NULL;
1103}
1104
1105