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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * zfcp device driver
0004  *
0005  * Fibre Channel related functions for the zfcp device driver.
0006  *
0007  * Copyright IBM Corp. 2008, 2017
0008  */
0009 
0010 #define KMSG_COMPONENT "zfcp"
0011 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
0012 
0013 #include <linux/types.h>
0014 #include <linux/slab.h>
0015 #include <linux/utsname.h>
0016 #include <linux/random.h>
0017 #include <linux/bsg-lib.h>
0018 #include <scsi/fc/fc_els.h>
0019 #include <scsi/libfc.h>
0020 #include "zfcp_ext.h"
0021 #include "zfcp_fc.h"
0022 
0023 struct kmem_cache *zfcp_fc_req_cache;
0024 
0025 static u32 zfcp_fc_rscn_range_mask[] = {
0026     [ELS_ADDR_FMT_PORT]     = 0xFFFFFF,
0027     [ELS_ADDR_FMT_AREA]     = 0xFFFF00,
0028     [ELS_ADDR_FMT_DOM]      = 0xFF0000,
0029     [ELS_ADDR_FMT_FAB]      = 0x000000,
0030 };
0031 
0032 static bool no_auto_port_rescan;
0033 module_param(no_auto_port_rescan, bool, 0600);
0034 MODULE_PARM_DESC(no_auto_port_rescan,
0035          "no automatic port_rescan (default off)");
0036 
0037 static unsigned int port_scan_backoff = 500;
0038 module_param(port_scan_backoff, uint, 0600);
0039 MODULE_PARM_DESC(port_scan_backoff,
0040     "upper limit of port scan random backoff in msecs (default 500)");
0041 
0042 static unsigned int port_scan_ratelimit = 60000;
0043 module_param(port_scan_ratelimit, uint, 0600);
0044 MODULE_PARM_DESC(port_scan_ratelimit,
0045     "minimum interval between port scans in msecs (default 60000)");
0046 
0047 unsigned int zfcp_fc_port_scan_backoff(void)
0048 {
0049     if (!port_scan_backoff)
0050         return 0;
0051     return prandom_u32_max(port_scan_backoff);
0052 }
0053 
0054 static void zfcp_fc_port_scan_time(struct zfcp_adapter *adapter)
0055 {
0056     unsigned long interval = msecs_to_jiffies(port_scan_ratelimit);
0057     unsigned long backoff = msecs_to_jiffies(zfcp_fc_port_scan_backoff());
0058 
0059     adapter->next_port_scan = jiffies + interval + backoff;
0060 }
0061 
0062 static void zfcp_fc_port_scan(struct zfcp_adapter *adapter)
0063 {
0064     unsigned long now = jiffies;
0065     unsigned long next = adapter->next_port_scan;
0066     unsigned long delay = 0, max;
0067 
0068     /* delay only needed within waiting period */
0069     if (time_before(now, next)) {
0070         delay = next - now;
0071         /* paranoia: never ever delay scans longer than specified */
0072         max = msecs_to_jiffies(port_scan_ratelimit + port_scan_backoff);
0073         delay = min(delay, max);
0074     }
0075 
0076     queue_delayed_work(adapter->work_queue, &adapter->scan_work, delay);
0077 }
0078 
0079 void zfcp_fc_conditional_port_scan(struct zfcp_adapter *adapter)
0080 {
0081     if (no_auto_port_rescan)
0082         return;
0083 
0084     zfcp_fc_port_scan(adapter);
0085 }
0086 
0087 void zfcp_fc_inverse_conditional_port_scan(struct zfcp_adapter *adapter)
0088 {
0089     if (!no_auto_port_rescan)
0090         return;
0091 
0092     zfcp_fc_port_scan(adapter);
0093 }
0094 
0095 /**
0096  * zfcp_fc_post_event - post event to userspace via fc_transport
0097  * @work: work struct with enqueued events
0098  */
0099 void zfcp_fc_post_event(struct work_struct *work)
0100 {
0101     struct zfcp_fc_event *event = NULL, *tmp = NULL;
0102     LIST_HEAD(tmp_lh);
0103     struct zfcp_fc_events *events = container_of(work,
0104                     struct zfcp_fc_events, work);
0105     struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter,
0106                         events);
0107 
0108     spin_lock_bh(&events->list_lock);
0109     list_splice_init(&events->list, &tmp_lh);
0110     spin_unlock_bh(&events->list_lock);
0111 
0112     list_for_each_entry_safe(event, tmp, &tmp_lh, list) {
0113         fc_host_post_event(adapter->scsi_host, fc_get_event_number(),
0114                    event->code, event->data);
0115         list_del(&event->list);
0116         kfree(event);
0117     }
0118 }
0119 
0120 /**
0121  * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context
0122  * @adapter: The adapter where to enqueue the event
0123  * @event_code: The event code (as defined in fc_host_event_code in
0124  *      scsi_transport_fc.h)
0125  * @event_data: The event data (e.g. n_port page in case of els)
0126  */
0127 void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter,
0128                enum fc_host_event_code event_code, u32 event_data)
0129 {
0130     struct zfcp_fc_event *event;
0131 
0132     event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC);
0133     if (!event)
0134         return;
0135 
0136     event->code = event_code;
0137     event->data = event_data;
0138 
0139     spin_lock(&adapter->events.list_lock);
0140     list_add_tail(&event->list, &adapter->events.list);
0141     spin_unlock(&adapter->events.list_lock);
0142 
0143     queue_work(adapter->work_queue, &adapter->events.work);
0144 }
0145 
0146 static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port)
0147 {
0148     int ret = -EIO;
0149 
0150     if (mutex_lock_interruptible(&wka_port->mutex))
0151         return -ERESTARTSYS;
0152 
0153     if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE ||
0154         wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) {
0155         wka_port->status = ZFCP_FC_WKA_PORT_OPENING;
0156         if (zfcp_fsf_open_wka_port(wka_port)) {
0157             /* could not even send request, nothing to wait for */
0158             wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
0159             goto out;
0160         }
0161     }
0162 
0163     wait_event(wka_port->opened,
0164            wka_port->status == ZFCP_FC_WKA_PORT_ONLINE ||
0165            wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
0166 
0167     if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) {
0168         atomic_inc(&wka_port->refcount);
0169         ret = 0;
0170         goto out;
0171     }
0172 out:
0173     mutex_unlock(&wka_port->mutex);
0174     return ret;
0175 }
0176 
0177 static void zfcp_fc_wka_port_offline(struct work_struct *work)
0178 {
0179     struct delayed_work *dw = to_delayed_work(work);
0180     struct zfcp_fc_wka_port *wka_port =
0181             container_of(dw, struct zfcp_fc_wka_port, work);
0182 
0183     mutex_lock(&wka_port->mutex);
0184     if ((atomic_read(&wka_port->refcount) != 0) ||
0185         (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE))
0186         goto out;
0187 
0188     wka_port->status = ZFCP_FC_WKA_PORT_CLOSING;
0189     if (zfcp_fsf_close_wka_port(wka_port)) {
0190         /* could not even send request, nothing to wait for */
0191         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
0192         goto out;
0193     }
0194     wait_event(wka_port->closed,
0195            wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
0196 out:
0197     mutex_unlock(&wka_port->mutex);
0198 }
0199 
0200 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port)
0201 {
0202     if (atomic_dec_return(&wka_port->refcount) != 0)
0203         return;
0204     /* wait 10 milliseconds, other reqs might pop in */
0205     queue_delayed_work(wka_port->adapter->work_queue, &wka_port->work,
0206                msecs_to_jiffies(10));
0207 }
0208 
0209 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id,
0210                   struct zfcp_adapter *adapter)
0211 {
0212     init_waitqueue_head(&wka_port->opened);
0213     init_waitqueue_head(&wka_port->closed);
0214 
0215     wka_port->adapter = adapter;
0216     wka_port->d_id = d_id;
0217 
0218     wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
0219     atomic_set(&wka_port->refcount, 0);
0220     mutex_init(&wka_port->mutex);
0221     INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline);
0222 }
0223 
0224 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka)
0225 {
0226     cancel_delayed_work_sync(&wka->work);
0227     mutex_lock(&wka->mutex);
0228     wka->status = ZFCP_FC_WKA_PORT_OFFLINE;
0229     mutex_unlock(&wka->mutex);
0230 }
0231 
0232 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs)
0233 {
0234     if (!gs)
0235         return;
0236     zfcp_fc_wka_port_force_offline(&gs->ms);
0237     zfcp_fc_wka_port_force_offline(&gs->ts);
0238     zfcp_fc_wka_port_force_offline(&gs->ds);
0239     zfcp_fc_wka_port_force_offline(&gs->as);
0240 }
0241 
0242 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
0243                    struct fc_els_rscn_page *page)
0244 {
0245     unsigned long flags;
0246     struct zfcp_adapter *adapter = fsf_req->adapter;
0247     struct zfcp_port *port;
0248 
0249     read_lock_irqsave(&adapter->port_list_lock, flags);
0250     list_for_each_entry(port, &adapter->port_list, list) {
0251         if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range))
0252             zfcp_fc_test_link(port);
0253     }
0254     read_unlock_irqrestore(&adapter->port_list_lock, flags);
0255 }
0256 
0257 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
0258 {
0259     struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
0260     struct zfcp_adapter *adapter = fsf_req->adapter;
0261     struct fc_els_rscn *head;
0262     struct fc_els_rscn_page *page;
0263     u16 i;
0264     u16 no_entries;
0265     unsigned int afmt;
0266 
0267     head = (struct fc_els_rscn *) status_buffer->payload.data;
0268     page = (struct fc_els_rscn_page *) head;
0269 
0270     /* see FC-FS */
0271     no_entries = be16_to_cpu(head->rscn_plen) /
0272         sizeof(struct fc_els_rscn_page);
0273 
0274     if (no_entries > 1) {
0275         /* handle failed ports */
0276         unsigned long flags;
0277         struct zfcp_port *port;
0278 
0279         read_lock_irqsave(&adapter->port_list_lock, flags);
0280         list_for_each_entry(port, &adapter->port_list, list) {
0281             if (port->d_id)
0282                 continue;
0283             zfcp_erp_port_reopen(port,
0284                          ZFCP_STATUS_COMMON_ERP_FAILED,
0285                          "fcrscn1");
0286         }
0287         read_unlock_irqrestore(&adapter->port_list_lock, flags);
0288     }
0289 
0290     for (i = 1; i < no_entries; i++) {
0291         /* skip head and start with 1st element */
0292         page++;
0293         afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
0294         _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
0295                        page);
0296         zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,
0297                       *(u32 *)page);
0298     }
0299     zfcp_fc_conditional_port_scan(fsf_req->adapter);
0300 }
0301 
0302 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
0303 {
0304     unsigned long flags;
0305     struct zfcp_adapter *adapter = req->adapter;
0306     struct zfcp_port *port;
0307 
0308     read_lock_irqsave(&adapter->port_list_lock, flags);
0309     list_for_each_entry(port, &adapter->port_list, list)
0310         if (port->wwpn == wwpn) {
0311             zfcp_erp_port_forced_reopen(port, 0, "fciwwp1");
0312             break;
0313         }
0314     read_unlock_irqrestore(&adapter->port_list_lock, flags);
0315 }
0316 
0317 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
0318 {
0319     struct fsf_status_read_buffer *status_buffer;
0320     struct fc_els_flogi *plogi;
0321 
0322     status_buffer = (struct fsf_status_read_buffer *) req->data;
0323     plogi = (struct fc_els_flogi *) status_buffer->payload.data;
0324     zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn));
0325 }
0326 
0327 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
0328 {
0329     struct fsf_status_read_buffer *status_buffer =
0330         (struct fsf_status_read_buffer *)req->data;
0331     struct fc_els_logo *logo =
0332         (struct fc_els_logo *) status_buffer->payload.data;
0333 
0334     zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn));
0335 }
0336 
0337 /**
0338  * zfcp_fc_incoming_els - handle incoming ELS
0339  * @fsf_req: request which contains incoming ELS
0340  */
0341 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
0342 {
0343     struct fsf_status_read_buffer *status_buffer =
0344         (struct fsf_status_read_buffer *) fsf_req->data;
0345     unsigned int els_type = status_buffer->payload.data[0];
0346 
0347     zfcp_dbf_san_in_els("fciels1", fsf_req);
0348     if (els_type == ELS_PLOGI)
0349         zfcp_fc_incoming_plogi(fsf_req);
0350     else if (els_type == ELS_LOGO)
0351         zfcp_fc_incoming_logo(fsf_req);
0352     else if (els_type == ELS_RSCN)
0353         zfcp_fc_incoming_rscn(fsf_req);
0354 }
0355 
0356 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req)
0357 {
0358     struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
0359     struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
0360 
0361     if (ct_els->status)
0362         return;
0363     if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC))
0364         return;
0365 
0366     /* looks like a valid d_id */
0367     ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid);
0368 }
0369 
0370 static void zfcp_fc_complete(void *data)
0371 {
0372     complete(data);
0373 }
0374 
0375 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size)
0376 {
0377     ct_hdr->ct_rev = FC_CT_REV;
0378     ct_hdr->ct_fs_type = FC_FST_DIR;
0379     ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE;
0380     ct_hdr->ct_cmd = cpu_to_be16(cmd);
0381     ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4);
0382 }
0383 
0384 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
0385                      struct zfcp_fc_req *fc_req)
0386 {
0387     struct zfcp_adapter *adapter = port->adapter;
0388     DECLARE_COMPLETION_ONSTACK(completion);
0389     struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req;
0390     struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
0391     int ret;
0392 
0393     /* setup parameters for send generic command */
0394     fc_req->ct_els.port = port;
0395     fc_req->ct_els.handler = zfcp_fc_complete;
0396     fc_req->ct_els.handler_data = &completion;
0397     fc_req->ct_els.req = &fc_req->sg_req;
0398     fc_req->ct_els.resp = &fc_req->sg_rsp;
0399     sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req));
0400     sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp));
0401 
0402     zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr,
0403                FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE);
0404     gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn);
0405 
0406     ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els,
0407                    adapter->pool.gid_pn_req,
0408                    ZFCP_FC_CTELS_TMO);
0409     if (!ret) {
0410         wait_for_completion(&completion);
0411         zfcp_fc_ns_gid_pn_eval(fc_req);
0412     }
0413     return ret;
0414 }
0415 
0416 /**
0417  * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request
0418  * @port: port where GID_PN request is needed
0419  * return: -ENOMEM on error, 0 otherwise
0420  */
0421 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
0422 {
0423     int ret;
0424     struct zfcp_fc_req *fc_req;
0425     struct zfcp_adapter *adapter = port->adapter;
0426 
0427     fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC);
0428     if (!fc_req)
0429         return -ENOMEM;
0430 
0431     memset(fc_req, 0, sizeof(*fc_req));
0432 
0433     ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
0434     if (ret)
0435         goto out;
0436 
0437     ret = zfcp_fc_ns_gid_pn_request(port, fc_req);
0438 
0439     zfcp_fc_wka_port_put(&adapter->gs->ds);
0440 out:
0441     mempool_free(fc_req, adapter->pool.gid_pn);
0442     return ret;
0443 }
0444 
0445 void zfcp_fc_port_did_lookup(struct work_struct *work)
0446 {
0447     int ret;
0448     struct zfcp_port *port = container_of(work, struct zfcp_port,
0449                           gid_pn_work);
0450 
0451     set_worker_desc("zgidpn%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */
0452     ret = zfcp_fc_ns_gid_pn(port);
0453     if (ret) {
0454         /* could not issue gid_pn for some reason */
0455         zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1");
0456         goto out;
0457     }
0458 
0459     if (!port->d_id) {
0460         zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
0461         goto out;
0462     }
0463 
0464     zfcp_erp_port_reopen(port, 0, "fcgpn_3");
0465 out:
0466     put_device(&port->dev);
0467 }
0468 
0469 /**
0470  * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request
0471  * @port: The zfcp_port to lookup the d_id for.
0472  */
0473 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)
0474 {
0475     get_device(&port->dev);
0476     if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))
0477         put_device(&port->dev);
0478 }
0479 
0480 /**
0481  * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
0482  * @port: zfcp_port structure
0483  * @plogi: plogi payload
0484  *
0485  * Evaluate PLOGI playload and copy important fields into zfcp_port structure
0486  */
0487 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi)
0488 {
0489     if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) {
0490         port->d_id = 0;
0491         dev_warn(&port->adapter->ccw_device->dev,
0492              "A port opened with WWPN 0x%016Lx returned data that "
0493              "identifies it as WWPN 0x%016Lx\n",
0494              (unsigned long long) port->wwpn,
0495              (unsigned long long) be64_to_cpu(plogi->fl_wwpn));
0496         return;
0497     }
0498 
0499     port->wwnn = be64_to_cpu(plogi->fl_wwnn);
0500     port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data);
0501 
0502     if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID))
0503         port->supported_classes |= FC_COS_CLASS1;
0504     if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID))
0505         port->supported_classes |= FC_COS_CLASS2;
0506     if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID))
0507         port->supported_classes |= FC_COS_CLASS3;
0508     if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID))
0509         port->supported_classes |= FC_COS_CLASS4;
0510 }
0511 
0512 static void zfcp_fc_adisc_handler(void *data)
0513 {
0514     struct zfcp_fc_req *fc_req = data;
0515     struct zfcp_port *port = fc_req->ct_els.port;
0516     struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp;
0517 
0518     if (fc_req->ct_els.status) {
0519         /* request rejected or timed out */
0520         zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
0521                         "fcadh_1");
0522         goto out;
0523     }
0524 
0525     if (!port->wwnn)
0526         port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn);
0527 
0528     if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) ||
0529         !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
0530         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
0531                      "fcadh_2");
0532         goto out;
0533     }
0534 
0535     /* re-init to undo drop from zfcp_fc_adisc() */
0536     port->d_id = ntoh24(adisc_resp->adisc_port_id);
0537     /* port is good, unblock rport without going through erp */
0538     zfcp_scsi_schedule_rport_register(port);
0539  out:
0540     atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
0541     put_device(&port->dev);
0542     kmem_cache_free(zfcp_fc_req_cache, fc_req);
0543 }
0544 
0545 static int zfcp_fc_adisc(struct zfcp_port *port)
0546 {
0547     struct zfcp_fc_req *fc_req;
0548     struct zfcp_adapter *adapter = port->adapter;
0549     struct Scsi_Host *shost = adapter->scsi_host;
0550     u32 d_id;
0551     int ret;
0552 
0553     fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC);
0554     if (!fc_req)
0555         return -ENOMEM;
0556 
0557     fc_req->ct_els.port = port;
0558     fc_req->ct_els.req = &fc_req->sg_req;
0559     fc_req->ct_els.resp = &fc_req->sg_rsp;
0560     sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req,
0561             sizeof(struct fc_els_adisc));
0562     sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp,
0563             sizeof(struct fc_els_adisc));
0564 
0565     fc_req->ct_els.handler = zfcp_fc_adisc_handler;
0566     fc_req->ct_els.handler_data = fc_req;
0567 
0568     /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
0569        without FC-AL-2 capability, so we don't set it */
0570     fc_req->u.adisc.req.adisc_wwpn = cpu_to_be64(fc_host_port_name(shost));
0571     fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(fc_host_node_name(shost));
0572     fc_req->u.adisc.req.adisc_cmd = ELS_ADISC;
0573     hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost));
0574 
0575     d_id = port->d_id; /* remember as destination for send els below */
0576     /*
0577      * Force fresh GID_PN lookup on next port recovery.
0578      * Must happen after request setup and before sending request,
0579      * to prevent race with port->d_id re-init in zfcp_fc_adisc_handler().
0580      */
0581     port->d_id = 0;
0582 
0583     ret = zfcp_fsf_send_els(adapter, d_id, &fc_req->ct_els,
0584                 ZFCP_FC_CTELS_TMO);
0585     if (ret)
0586         kmem_cache_free(zfcp_fc_req_cache, fc_req);
0587 
0588     return ret;
0589 }
0590 
0591 void zfcp_fc_link_test_work(struct work_struct *work)
0592 {
0593     struct zfcp_port *port =
0594         container_of(work, struct zfcp_port, test_link_work);
0595     int retval;
0596 
0597     set_worker_desc("zadisc%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */
0598     get_device(&port->dev);
0599     port->rport_task = RPORT_DEL;
0600     zfcp_scsi_rport_work(&port->rport_work);
0601 
0602     /* only issue one test command at one time per port */
0603     if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
0604         goto out;
0605 
0606     atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
0607 
0608     retval = zfcp_fc_adisc(port);
0609     if (retval == 0)
0610         return;
0611 
0612     /* send of ADISC was not possible */
0613     atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
0614     zfcp_erp_port_forced_reopen(port, 0, "fcltwk1");
0615 
0616 out:
0617     put_device(&port->dev);
0618 }
0619 
0620 /**
0621  * zfcp_fc_test_link - lightweight link test procedure
0622  * @port: port to be tested
0623  *
0624  * Test status of a link to a remote port using the ELS command ADISC.
0625  * If there is a problem with the remote port, error recovery steps
0626  * will be triggered.
0627  */
0628 void zfcp_fc_test_link(struct zfcp_port *port)
0629 {
0630     get_device(&port->dev);
0631     if (!queue_work(port->adapter->work_queue, &port->test_link_work))
0632         put_device(&port->dev);
0633 }
0634 
0635 /**
0636  * zfcp_fc_sg_free_table - free memory used by scatterlists
0637  * @sg: pointer to scatterlist
0638  * @count: number of scatterlist which are to be free'ed
0639  * the scatterlist are expected to reference pages always
0640  */
0641 static void zfcp_fc_sg_free_table(struct scatterlist *sg, int count)
0642 {
0643     int i;
0644 
0645     for (i = 0; i < count; i++, sg = sg_next(sg))
0646         if (sg)
0647             free_page((unsigned long) sg_virt(sg));
0648         else
0649             break;
0650 }
0651 
0652 /**
0653  * zfcp_fc_sg_setup_table - init scatterlist and allocate, assign buffers
0654  * @sg: pointer to struct scatterlist
0655  * @count: number of scatterlists which should be assigned with buffers
0656  * of size page
0657  *
0658  * Returns: 0 on success, -ENOMEM otherwise
0659  */
0660 static int zfcp_fc_sg_setup_table(struct scatterlist *sg, int count)
0661 {
0662     void *addr;
0663     int i;
0664 
0665     sg_init_table(sg, count);
0666     for (i = 0; i < count; i++, sg = sg_next(sg)) {
0667         addr = (void *) get_zeroed_page(GFP_KERNEL);
0668         if (!addr) {
0669             zfcp_fc_sg_free_table(sg, i);
0670             return -ENOMEM;
0671         }
0672         sg_set_buf(sg, addr, PAGE_SIZE);
0673     }
0674     return 0;
0675 }
0676 
0677 static struct zfcp_fc_req *zfcp_fc_alloc_sg_env(int buf_num)
0678 {
0679     struct zfcp_fc_req *fc_req;
0680 
0681     fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
0682     if (!fc_req)
0683         return NULL;
0684 
0685     if (zfcp_fc_sg_setup_table(&fc_req->sg_rsp, buf_num)) {
0686         kmem_cache_free(zfcp_fc_req_cache, fc_req);
0687         return NULL;
0688     }
0689 
0690     sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req,
0691             sizeof(struct zfcp_fc_gpn_ft_req));
0692 
0693     return fc_req;
0694 }
0695 
0696 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req,
0697                    struct zfcp_adapter *adapter, int max_bytes)
0698 {
0699     struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
0700     struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req;
0701     DECLARE_COMPLETION_ONSTACK(completion);
0702     int ret;
0703 
0704     zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes);
0705     req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;
0706 
0707     ct_els->handler = zfcp_fc_complete;
0708     ct_els->handler_data = &completion;
0709     ct_els->req = &fc_req->sg_req;
0710     ct_els->resp = &fc_req->sg_rsp;
0711 
0712     ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
0713                    ZFCP_FC_CTELS_TMO);
0714     if (!ret)
0715         wait_for_completion(&completion);
0716     return ret;
0717 }
0718 
0719 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
0720 {
0721     if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
0722         return;
0723 
0724     atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status);
0725 
0726     if ((port->supported_classes != 0) ||
0727         !list_empty(&port->unit_list))
0728         return;
0729 
0730     list_move_tail(&port->list, lh);
0731 }
0732 
0733 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,
0734                    struct zfcp_adapter *adapter, int max_entries)
0735 {
0736     struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
0737     struct scatterlist *sg = &fc_req->sg_rsp;
0738     struct fc_ct_hdr *hdr = sg_virt(sg);
0739     struct fc_gpn_ft_resp *acc = sg_virt(sg);
0740     struct zfcp_port *port, *tmp;
0741     unsigned long flags;
0742     LIST_HEAD(remove_lh);
0743     u32 d_id;
0744     int ret = 0, x, last = 0;
0745 
0746     if (ct_els->status)
0747         return -EIO;
0748 
0749     if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) {
0750         if (hdr->ct_reason == FC_FS_RJT_UNABL)
0751             return -EAGAIN; /* might be a temporary condition */
0752         return -EIO;
0753     }
0754 
0755     if (hdr->ct_mr_size) {
0756         dev_warn(&adapter->ccw_device->dev,
0757              "The name server reported %d words residual data\n",
0758              hdr->ct_mr_size);
0759         return -E2BIG;
0760     }
0761 
0762     /* first entry is the header */
0763     for (x = 1; x < max_entries && !last; x++) {
0764         if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
0765             acc++;
0766         else
0767             acc = sg_virt(++sg);
0768 
0769         last = acc->fp_flags & FC_NS_FID_LAST;
0770         d_id = ntoh24(acc->fp_fid);
0771 
0772         /* don't attach ports with a well known address */
0773         if (d_id >= FC_FID_WELL_KNOWN_BASE)
0774             continue;
0775         /* skip the adapter's port and known remote ports */
0776         if (be64_to_cpu(acc->fp_wwpn) ==
0777             fc_host_port_name(adapter->scsi_host))
0778             continue;
0779 
0780         port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn),
0781                      ZFCP_STATUS_COMMON_NOESC, d_id);
0782         if (!IS_ERR(port))
0783             zfcp_erp_port_reopen(port, 0, "fcegpf1");
0784         else if (PTR_ERR(port) != -EEXIST)
0785             ret = PTR_ERR(port);
0786     }
0787 
0788     zfcp_erp_wait(adapter);
0789     write_lock_irqsave(&adapter->port_list_lock, flags);
0790     list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
0791         zfcp_fc_validate_port(port, &remove_lh);
0792     write_unlock_irqrestore(&adapter->port_list_lock, flags);
0793 
0794     list_for_each_entry_safe(port, tmp, &remove_lh, list) {
0795         zfcp_erp_port_shutdown(port, 0, "fcegpf2");
0796         device_unregister(&port->dev);
0797     }
0798 
0799     return ret;
0800 }
0801 
0802 /**
0803  * zfcp_fc_scan_ports - scan remote ports and attach new ports
0804  * @work: reference to scheduled work
0805  */
0806 void zfcp_fc_scan_ports(struct work_struct *work)
0807 {
0808     struct delayed_work *dw = to_delayed_work(work);
0809     struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter,
0810                             scan_work);
0811     int ret, i;
0812     struct zfcp_fc_req *fc_req;
0813     int chain, max_entries, buf_num, max_bytes;
0814 
0815     zfcp_fc_port_scan_time(adapter);
0816 
0817     chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
0818     buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1;
0819     max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE;
0820     max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE;
0821 
0822     if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
0823         fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
0824         return;
0825 
0826     if (zfcp_fc_wka_port_get(&adapter->gs->ds))
0827         return;
0828 
0829     fc_req = zfcp_fc_alloc_sg_env(buf_num);
0830     if (!fc_req)
0831         goto out;
0832 
0833     for (i = 0; i < 3; i++) {
0834         ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes);
0835         if (!ret) {
0836             ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries);
0837             if (ret == -EAGAIN)
0838                 ssleep(1);
0839             else
0840                 break;
0841         }
0842     }
0843     zfcp_fc_sg_free_table(&fc_req->sg_rsp, buf_num);
0844     kmem_cache_free(zfcp_fc_req_cache, fc_req);
0845 out:
0846     zfcp_fc_wka_port_put(&adapter->gs->ds);
0847 }
0848 
0849 static int zfcp_fc_gspn(struct zfcp_adapter *adapter,
0850             struct zfcp_fc_req *fc_req)
0851 {
0852     DECLARE_COMPLETION_ONSTACK(completion);
0853     char devno[] = "DEVNO:";
0854     struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
0855     struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req;
0856     struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp;
0857     int ret;
0858 
0859     zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID,
0860                FC_SYMBOLIC_NAME_SIZE);
0861     hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host));
0862 
0863     sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req));
0864     sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp));
0865 
0866     ct_els->handler = zfcp_fc_complete;
0867     ct_els->handler_data = &completion;
0868     ct_els->req = &fc_req->sg_req;
0869     ct_els->resp = &fc_req->sg_rsp;
0870 
0871     ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
0872                    ZFCP_FC_CTELS_TMO);
0873     if (ret)
0874         return ret;
0875 
0876     wait_for_completion(&completion);
0877     if (ct_els->status)
0878         return ct_els->status;
0879 
0880     if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV &&
0881         !(strstr(gspn_rsp->gspn.fp_name, devno)))
0882         snprintf(fc_host_symbolic_name(adapter->scsi_host),
0883              FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s",
0884              gspn_rsp->gspn.fp_name, devno,
0885              dev_name(&adapter->ccw_device->dev),
0886              init_utsname()->nodename);
0887     else
0888         strlcpy(fc_host_symbolic_name(adapter->scsi_host),
0889             gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE);
0890 
0891     return 0;
0892 }
0893 
0894 static void zfcp_fc_rspn(struct zfcp_adapter *adapter,
0895              struct zfcp_fc_req *fc_req)
0896 {
0897     DECLARE_COMPLETION_ONSTACK(completion);
0898     struct Scsi_Host *shost = adapter->scsi_host;
0899     struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
0900     struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req;
0901     struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp;
0902     int ret, len;
0903 
0904     zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID,
0905                FC_SYMBOLIC_NAME_SIZE);
0906     hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost));
0907     len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost),
0908               FC_SYMBOLIC_NAME_SIZE);
0909     rspn_req->rspn.fr_name_len = len;
0910 
0911     sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req));
0912     sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp));
0913 
0914     ct_els->handler = zfcp_fc_complete;
0915     ct_els->handler_data = &completion;
0916     ct_els->req = &fc_req->sg_req;
0917     ct_els->resp = &fc_req->sg_rsp;
0918 
0919     ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
0920                    ZFCP_FC_CTELS_TMO);
0921     if (!ret)
0922         wait_for_completion(&completion);
0923 }
0924 
0925 /**
0926  * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name
0927  * @work: ns_up_work of the adapter where to update the symbolic port name
0928  *
0929  * Retrieve the current symbolic port name that may have been set by
0930  * the hardware using the GSPN request and update the fc_host
0931  * symbolic_name sysfs attribute. When running in NPIV mode (and hence
0932  * the port name is unique for this system), update the symbolic port
0933  * name to add Linux specific information and update the FC nameserver
0934  * using the RSPN request.
0935  */
0936 void zfcp_fc_sym_name_update(struct work_struct *work)
0937 {
0938     struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
0939                             ns_up_work);
0940     int ret;
0941     struct zfcp_fc_req *fc_req;
0942 
0943     if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
0944         fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
0945         return;
0946 
0947     fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
0948     if (!fc_req)
0949         return;
0950 
0951     ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
0952     if (ret)
0953         goto out_free;
0954 
0955     ret = zfcp_fc_gspn(adapter, fc_req);
0956     if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
0957         goto out_ds_put;
0958 
0959     memset(fc_req, 0, sizeof(*fc_req));
0960     zfcp_fc_rspn(adapter, fc_req);
0961 
0962 out_ds_put:
0963     zfcp_fc_wka_port_put(&adapter->gs->ds);
0964 out_free:
0965     kmem_cache_free(zfcp_fc_req_cache, fc_req);
0966 }
0967 
0968 static void zfcp_fc_ct_els_job_handler(void *data)
0969 {
0970     struct bsg_job *job = data;
0971     struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data;
0972     struct fc_bsg_reply *jr = job->reply;
0973 
0974     jr->reply_payload_rcv_len = job->reply_payload.payload_len;
0975     jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
0976     jr->result = zfcp_ct_els->status ? -EIO : 0;
0977     bsg_job_done(job, jr->result, jr->reply_payload_rcv_len);
0978 }
0979 
0980 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job)
0981 {
0982     u32 preamble_word1;
0983     u8 gs_type;
0984     struct zfcp_adapter *adapter;
0985     struct fc_bsg_request *bsg_request = job->request;
0986     struct fc_rport *rport = fc_bsg_to_rport(job);
0987     struct Scsi_Host *shost;
0988 
0989     preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1;
0990     gs_type = (preamble_word1 & 0xff000000) >> 24;
0991 
0992     shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
0993     adapter = (struct zfcp_adapter *) shost->hostdata[0];
0994 
0995     switch (gs_type) {
0996     case FC_FST_ALIAS:
0997         return &adapter->gs->as;
0998     case FC_FST_MGMT:
0999         return &adapter->gs->ms;
1000     case FC_FST_TIME:
1001         return &adapter->gs->ts;
1002         break;
1003     case FC_FST_DIR:
1004         return &adapter->gs->ds;
1005         break;
1006     default:
1007         return NULL;
1008     }
1009 }
1010 
1011 static void zfcp_fc_ct_job_handler(void *data)
1012 {
1013     struct bsg_job *job = data;
1014     struct zfcp_fc_wka_port *wka_port;
1015 
1016     wka_port = zfcp_fc_job_wka_port(job);
1017     zfcp_fc_wka_port_put(wka_port);
1018 
1019     zfcp_fc_ct_els_job_handler(data);
1020 }
1021 
1022 static int zfcp_fc_exec_els_job(struct bsg_job *job,
1023                 struct zfcp_adapter *adapter)
1024 {
1025     struct zfcp_fsf_ct_els *els = job->dd_data;
1026     struct fc_rport *rport = fc_bsg_to_rport(job);
1027     struct fc_bsg_request *bsg_request = job->request;
1028     struct zfcp_port *port;
1029     u32 d_id;
1030 
1031     if (rport) {
1032         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
1033         if (!port)
1034             return -EINVAL;
1035 
1036         d_id = port->d_id;
1037         put_device(&port->dev);
1038     } else
1039         d_id = ntoh24(bsg_request->rqst_data.h_els.port_id);
1040 
1041     els->handler = zfcp_fc_ct_els_job_handler;
1042     return zfcp_fsf_send_els(adapter, d_id, els, job->timeout / HZ);
1043 }
1044 
1045 static int zfcp_fc_exec_ct_job(struct bsg_job *job,
1046                    struct zfcp_adapter *adapter)
1047 {
1048     int ret;
1049     struct zfcp_fsf_ct_els *ct = job->dd_data;
1050     struct zfcp_fc_wka_port *wka_port;
1051 
1052     wka_port = zfcp_fc_job_wka_port(job);
1053     if (!wka_port)
1054         return -EINVAL;
1055 
1056     ret = zfcp_fc_wka_port_get(wka_port);
1057     if (ret)
1058         return ret;
1059 
1060     ct->handler = zfcp_fc_ct_job_handler;
1061     ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->timeout / HZ);
1062     if (ret)
1063         zfcp_fc_wka_port_put(wka_port);
1064 
1065     return ret;
1066 }
1067 
1068 int zfcp_fc_exec_bsg_job(struct bsg_job *job)
1069 {
1070     struct Scsi_Host *shost;
1071     struct zfcp_adapter *adapter;
1072     struct zfcp_fsf_ct_els *ct_els = job->dd_data;
1073     struct fc_bsg_request *bsg_request = job->request;
1074     struct fc_rport *rport = fc_bsg_to_rport(job);
1075 
1076     shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);
1077     adapter = (struct zfcp_adapter *)shost->hostdata[0];
1078 
1079     if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
1080         return -EINVAL;
1081 
1082     ct_els->req = job->request_payload.sg_list;
1083     ct_els->resp = job->reply_payload.sg_list;
1084     ct_els->handler_data = job;
1085 
1086     switch (bsg_request->msgcode) {
1087     case FC_BSG_RPT_ELS:
1088     case FC_BSG_HST_ELS_NOLOGIN:
1089         return zfcp_fc_exec_els_job(job, adapter);
1090     case FC_BSG_RPT_CT:
1091     case FC_BSG_HST_CT:
1092         return zfcp_fc_exec_ct_job(job, adapter);
1093     default:
1094         return -EINVAL;
1095     }
1096 }
1097 
1098 int zfcp_fc_timeout_bsg_job(struct bsg_job *job)
1099 {
1100     /* hardware tracks timeout, reset bsg timeout to not interfere */
1101     return -EAGAIN;
1102 }
1103 
1104 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
1105 {
1106     struct zfcp_fc_wka_ports *wka_ports;
1107 
1108     wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL);
1109     if (!wka_ports)
1110         return -ENOMEM;
1111 
1112     adapter->gs = wka_ports;
1113     zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);
1114     zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);
1115     zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);
1116     zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);
1117 
1118     return 0;
1119 }
1120 
1121 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)
1122 {
1123     kfree(adapter->gs);
1124     adapter->gs = NULL;
1125 }
1126
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