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1// SPDX-License-Identifier: GPL-2.02/*3 * zfcp device driver4 *5 * Fibre Channel related functions for the zfcp device driver.6 *7 * Copyright IBM Corp. 2008, 20178 */9 10#define KMSG_COMPONENT "zfcp"11#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt12 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 get_random_u32_below(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_transport97 * @work: work struct with enqueued events98 */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 context122 * @adapter: The adapter where to enqueue the event123 * @event_code: The event code (as defined in fc_host_event_code in124 * 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 int ret = -EIO;149 150 if (mutex_lock_interruptible(&wka_port->mutex))151 return -ERESTARTSYS;152 153 if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE ||154 wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) {155 wka_port->status = ZFCP_FC_WKA_PORT_OPENING;156 if (zfcp_fsf_open_wka_port(wka_port)) {157 /* could not even send request, nothing to wait for */158 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;159 goto out;160 }161 }162 163 wait_event(wka_port->opened,164 wka_port->status == ZFCP_FC_WKA_PORT_ONLINE ||165 wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);166 167 if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) {168 atomic_inc(&wka_port->refcount);169 ret = 0;170 goto out;171 }172out:173 mutex_unlock(&wka_port->mutex);174 return ret;175}176 177static void zfcp_fc_wka_port_offline(struct work_struct *work)178{179 struct delayed_work *dw = to_delayed_work(work);180 struct zfcp_fc_wka_port *wka_port =181 container_of(dw, struct zfcp_fc_wka_port, work);182 183 mutex_lock(&wka_port->mutex);184 if ((atomic_read(&wka_port->refcount) != 0) ||185 (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE))186 goto out;187 188 wka_port->status = ZFCP_FC_WKA_PORT_CLOSING;189 if (zfcp_fsf_close_wka_port(wka_port)) {190 /* could not even send request, nothing to wait for */191 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;192 goto out;193 }194 wait_event(wka_port->closed,195 wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);196out:197 mutex_unlock(&wka_port->mutex);198}199 200static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port)201{202 if (atomic_dec_return(&wka_port->refcount) != 0)203 return;204 /* wait 10 milliseconds, other reqs might pop in */205 queue_delayed_work(wka_port->adapter->work_queue, &wka_port->work,206 msecs_to_jiffies(10));207}208 209static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id,210 struct zfcp_adapter *adapter)211{212 init_waitqueue_head(&wka_port->opened);213 init_waitqueue_head(&wka_port->closed);214 215 wka_port->adapter = adapter;216 wka_port->d_id = d_id;217 218 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;219 atomic_set(&wka_port->refcount, 0);220 mutex_init(&wka_port->mutex);221 INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline);222}223 224static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka)225{226 cancel_delayed_work_sync(&wka->work);227 mutex_lock(&wka->mutex);228 wka->status = ZFCP_FC_WKA_PORT_OFFLINE;229 mutex_unlock(&wka->mutex);230}231 232void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs)233{234 if (!gs)235 return;236 zfcp_fc_wka_port_force_offline(&gs->ms);237 zfcp_fc_wka_port_force_offline(&gs->ts);238 zfcp_fc_wka_port_force_offline(&gs->ds);239 zfcp_fc_wka_port_force_offline(&gs->as);240}241 242static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,243 struct fc_els_rscn_page *page)244{245 unsigned long flags;246 struct zfcp_adapter *adapter = fsf_req->adapter;247 struct zfcp_port *port;248 249 read_lock_irqsave(&adapter->port_list_lock, flags);250 list_for_each_entry(port, &adapter->port_list, list) {251 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range))252 zfcp_fc_test_link(port);253 }254 read_unlock_irqrestore(&adapter->port_list_lock, flags);255}256 257static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)258{259 struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;260 struct zfcp_adapter *adapter = fsf_req->adapter;261 struct fc_els_rscn *head;262 struct fc_els_rscn_page *page;263 u16 i;264 u16 no_entries;265 unsigned int afmt;266 267 head = (struct fc_els_rscn *) status_buffer->payload.data;268 page = (struct fc_els_rscn_page *) head;269 270 /* see FC-FS */271 no_entries = be16_to_cpu(head->rscn_plen) /272 sizeof(struct fc_els_rscn_page);273 274 if (no_entries > 1) {275 /* handle failed ports */276 unsigned long flags;277 struct zfcp_port *port;278 279 read_lock_irqsave(&adapter->port_list_lock, flags);280 list_for_each_entry(port, &adapter->port_list, list) {281 if (port->d_id)282 continue;283 zfcp_erp_port_reopen(port,284 ZFCP_STATUS_COMMON_ERP_FAILED,285 "fcrscn1");286 }287 read_unlock_irqrestore(&adapter->port_list_lock, flags);288 }289 290 for (i = 1; i < no_entries; i++) {291 /* skip head and start with 1st element */292 page++;293 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;294 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],295 page);296 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,297 *(u32 *)page);298 }299 zfcp_fc_conditional_port_scan(fsf_req->adapter);300}301 302static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)303{304 unsigned long flags;305 struct zfcp_adapter *adapter = req->adapter;306 struct zfcp_port *port;307 308 read_lock_irqsave(&adapter->port_list_lock, flags);309 list_for_each_entry(port, &adapter->port_list, list)310 if (port->wwpn == wwpn) {311 zfcp_erp_port_forced_reopen(port, 0, "fciwwp1");312 break;313 }314 read_unlock_irqrestore(&adapter->port_list_lock, flags);315}316 317static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)318{319 struct fsf_status_read_buffer *status_buffer;320 struct fc_els_flogi *plogi;321 322 status_buffer = (struct fsf_status_read_buffer *) req->data;323 plogi = (struct fc_els_flogi *) status_buffer->payload.data;324 zfcp_fc_incoming_wwpn(req, be64_to_cpu(plogi->fl_wwpn));325}326 327static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)328{329 struct fsf_status_read_buffer *status_buffer =330 (struct fsf_status_read_buffer *)req->data;331 struct fc_els_logo *logo =332 (struct fc_els_logo *) status_buffer->payload.data;333 334 zfcp_fc_incoming_wwpn(req, be64_to_cpu(logo->fl_n_port_wwn));335}336 337/**338 * zfcp_fc_incoming_els - handle incoming ELS339 * @fsf_req: request which contains incoming ELS340 */341void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)342{343 struct fsf_status_read_buffer *status_buffer =344 (struct fsf_status_read_buffer *) fsf_req->data;345 unsigned int els_type = status_buffer->payload.data[0];346 347 zfcp_dbf_san_in_els("fciels1", fsf_req);348 if (els_type == ELS_PLOGI)349 zfcp_fc_incoming_plogi(fsf_req);350 else if (els_type == ELS_LOGO)351 zfcp_fc_incoming_logo(fsf_req);352 else if (els_type == ELS_RSCN)353 zfcp_fc_incoming_rscn(fsf_req);354}355 356static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req)357{358 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;359 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;360 361 if (ct_els->status)362 return;363 if (gid_pn_rsp->ct_hdr.ct_cmd != cpu_to_be16(FC_FS_ACC))364 return;365 366 /* looks like a valid d_id */367 ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid);368}369 370static void zfcp_fc_complete(void *data)371{372 complete(data);373}374 375static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size)376{377 ct_hdr->ct_rev = FC_CT_REV;378 ct_hdr->ct_fs_type = FC_FST_DIR;379 ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE;380 ct_hdr->ct_cmd = cpu_to_be16(cmd);381 ct_hdr->ct_mr_size = cpu_to_be16(mr_size / 4);382}383 384static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,385 struct zfcp_fc_req *fc_req)386{387 struct zfcp_adapter *adapter = port->adapter;388 DECLARE_COMPLETION_ONSTACK(completion);389 struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req;390 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;391 int ret;392 393 /* setup parameters for send generic command */394 fc_req->ct_els.port = port;395 fc_req->ct_els.handler = zfcp_fc_complete;396 fc_req->ct_els.handler_data = &completion;397 fc_req->ct_els.req = &fc_req->sg_req;398 fc_req->ct_els.resp = &fc_req->sg_rsp;399 sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req));400 sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp));401 402 zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr,403 FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE);404 gid_pn_req->gid_pn.fn_wwpn = cpu_to_be64(port->wwpn);405 406 ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els,407 adapter->pool.gid_pn_req,408 ZFCP_FC_CTELS_TMO);409 if (!ret) {410 wait_for_completion(&completion);411 zfcp_fc_ns_gid_pn_eval(fc_req);412 }413 return ret;414}415 416/**417 * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request418 * @port: port where GID_PN request is needed419 * return: -ENOMEM on error, 0 otherwise420 */421static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)422{423 int ret;424 struct zfcp_fc_req *fc_req;425 struct zfcp_adapter *adapter = port->adapter;426 427 fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC);428 if (!fc_req)429 return -ENOMEM;430 431 memset(fc_req, 0, sizeof(*fc_req));432 433 ret = zfcp_fc_wka_port_get(&adapter->gs->ds);434 if (ret)435 goto out;436 437 ret = zfcp_fc_ns_gid_pn_request(port, fc_req);438 439 zfcp_fc_wka_port_put(&adapter->gs->ds);440out:441 mempool_free(fc_req, adapter->pool.gid_pn);442 return ret;443}444 445void zfcp_fc_port_did_lookup(struct work_struct *work)446{447 int ret;448 struct zfcp_port *port = container_of(work, struct zfcp_port,449 gid_pn_work);450 451 set_worker_desc("zgidpn%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */452 ret = zfcp_fc_ns_gid_pn(port);453 if (ret) {454 /* could not issue gid_pn for some reason */455 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1");456 goto out;457 }458 459 if (!port->d_id) {460 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);461 goto out;462 }463 464 zfcp_erp_port_reopen(port, 0, "fcgpn_3");465out:466 put_device(&port->dev);467}468 469/**470 * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request471 * @port: The zfcp_port to lookup the d_id for.472 */473void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)474{475 get_device(&port->dev);476 if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))477 put_device(&port->dev);478}479 480/**481 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload482 * @port: zfcp_port structure483 * @plogi: plogi payload484 *485 * Evaluate PLOGI playload and copy important fields into zfcp_port structure486 */487void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi)488{489 if (be64_to_cpu(plogi->fl_wwpn) != port->wwpn) {490 port->d_id = 0;491 dev_warn(&port->adapter->ccw_device->dev,492 "A port opened with WWPN 0x%016Lx returned data that "493 "identifies it as WWPN 0x%016Lx\n",494 (unsigned long long) port->wwpn,495 (unsigned long long) be64_to_cpu(plogi->fl_wwpn));496 return;497 }498 499 port->wwnn = be64_to_cpu(plogi->fl_wwnn);500 port->maxframe_size = be16_to_cpu(plogi->fl_csp.sp_bb_data);501 502 if (plogi->fl_cssp[0].cp_class & cpu_to_be16(FC_CPC_VALID))503 port->supported_classes |= FC_COS_CLASS1;504 if (plogi->fl_cssp[1].cp_class & cpu_to_be16(FC_CPC_VALID))505 port->supported_classes |= FC_COS_CLASS2;506 if (plogi->fl_cssp[2].cp_class & cpu_to_be16(FC_CPC_VALID))507 port->supported_classes |= FC_COS_CLASS3;508 if (plogi->fl_cssp[3].cp_class & cpu_to_be16(FC_CPC_VALID))509 port->supported_classes |= FC_COS_CLASS4;510}511 512static void zfcp_fc_adisc_handler(void *data)513{514 struct zfcp_fc_req *fc_req = data;515 struct zfcp_port *port = fc_req->ct_els.port;516 struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp;517 518 if (fc_req->ct_els.status) {519 /* request rejected or timed out */520 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,521 "fcadh_1");522 goto out;523 }524 525 if (!port->wwnn)526 port->wwnn = be64_to_cpu(adisc_resp->adisc_wwnn);527 528 if ((port->wwpn != be64_to_cpu(adisc_resp->adisc_wwpn)) ||529 !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {530 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,531 "fcadh_2");532 goto out;533 }534 535 /* re-init to undo drop from zfcp_fc_adisc() */536 port->d_id = ntoh24(adisc_resp->adisc_port_id);537 /* port is still good, nothing to do */538 out:539 atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);540 put_device(&port->dev);541 kmem_cache_free(zfcp_fc_req_cache, fc_req);542}543 544static int zfcp_fc_adisc(struct zfcp_port *port)545{546 struct zfcp_fc_req *fc_req;547 struct zfcp_adapter *adapter = port->adapter;548 struct Scsi_Host *shost = adapter->scsi_host;549 u32 d_id;550 int ret;551 552 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC);553 if (!fc_req)554 return -ENOMEM;555 556 fc_req->ct_els.port = port;557 fc_req->ct_els.req = &fc_req->sg_req;558 fc_req->ct_els.resp = &fc_req->sg_rsp;559 sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req,560 sizeof(struct fc_els_adisc));561 sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp,562 sizeof(struct fc_els_adisc));563 564 fc_req->ct_els.handler = zfcp_fc_adisc_handler;565 fc_req->ct_els.handler_data = fc_req;566 567 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports568 without FC-AL-2 capability, so we don't set it */569 fc_req->u.adisc.req.adisc_wwpn = cpu_to_be64(fc_host_port_name(shost));570 fc_req->u.adisc.req.adisc_wwnn = cpu_to_be64(fc_host_node_name(shost));571 fc_req->u.adisc.req.adisc_cmd = ELS_ADISC;572 hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost));573 574 d_id = port->d_id; /* remember as destination for send els below */575 /*576 * Force fresh GID_PN lookup on next port recovery.577 * Must happen after request setup and before sending request,578 * to prevent race with port->d_id re-init in zfcp_fc_adisc_handler().579 */580 port->d_id = 0;581 582 ret = zfcp_fsf_send_els(adapter, d_id, &fc_req->ct_els,583 ZFCP_FC_CTELS_TMO);584 if (ret)585 kmem_cache_free(zfcp_fc_req_cache, fc_req);586 587 return ret;588}589 590void zfcp_fc_link_test_work(struct work_struct *work)591{592 struct zfcp_port *port =593 container_of(work, struct zfcp_port, test_link_work);594 int retval;595 596 set_worker_desc("zadisc%16llx", port->wwpn); /* < WORKER_DESC_LEN=24 */597 598 /* only issue one test command at one time per port */599 if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)600 goto out;601 602 atomic_or(ZFCP_STATUS_PORT_LINK_TEST, &port->status);603 604 retval = zfcp_fc_adisc(port);605 if (retval == 0)606 return;607 608 /* send of ADISC was not possible */609 atomic_andnot(ZFCP_STATUS_PORT_LINK_TEST, &port->status);610 zfcp_erp_port_forced_reopen(port, 0, "fcltwk1");611 612out:613 put_device(&port->dev);614}615 616/**617 * zfcp_fc_test_link - lightweight link test procedure618 * @port: port to be tested619 *620 * Test status of a link to a remote port using the ELS command ADISC.621 * If there is a problem with the remote port, error recovery steps622 * will be triggered.623 */624void zfcp_fc_test_link(struct zfcp_port *port)625{626 get_device(&port->dev);627 if (!queue_work(port->adapter->work_queue, &port->test_link_work))628 put_device(&port->dev);629}630 631/**632 * zfcp_fc_sg_free_table - free memory used by scatterlists633 * @sg: pointer to scatterlist634 * @count: number of scatterlist which are to be free'ed635 * the scatterlist are expected to reference pages always636 */637static void zfcp_fc_sg_free_table(struct scatterlist *sg, int count)638{639 int i;640 641 for (i = 0; i < count; i++, sg = sg_next(sg))642 if (sg)643 free_page((unsigned long) sg_virt(sg));644 else645 break;646}647 648/**649 * zfcp_fc_sg_setup_table - init scatterlist and allocate, assign buffers650 * @sg: pointer to struct scatterlist651 * @count: number of scatterlists which should be assigned with buffers652 * of size page653 *654 * Returns: 0 on success, -ENOMEM otherwise655 */656static int zfcp_fc_sg_setup_table(struct scatterlist *sg, int count)657{658 void *addr;659 int i;660 661 sg_init_table(sg, count);662 for (i = 0; i < count; i++, sg = sg_next(sg)) {663 addr = (void *) get_zeroed_page(GFP_KERNEL);664 if (!addr) {665 zfcp_fc_sg_free_table(sg, i);666 return -ENOMEM;667 }668 sg_set_buf(sg, addr, PAGE_SIZE);669 }670 return 0;671}672 673static struct zfcp_fc_req *zfcp_fc_alloc_sg_env(int buf_num)674{675 struct zfcp_fc_req *fc_req;676 677 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);678 if (!fc_req)679 return NULL;680 681 if (zfcp_fc_sg_setup_table(&fc_req->sg_rsp, buf_num)) {682 kmem_cache_free(zfcp_fc_req_cache, fc_req);683 return NULL;684 }685 686 sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req,687 sizeof(struct zfcp_fc_gpn_ft_req));688 689 return fc_req;690}691 692static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req,693 struct zfcp_adapter *adapter, int max_bytes)694{695 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;696 struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req;697 DECLARE_COMPLETION_ONSTACK(completion);698 int ret;699 700 zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes);701 req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;702 703 ct_els->handler = zfcp_fc_complete;704 ct_els->handler_data = &completion;705 ct_els->req = &fc_req->sg_req;706 ct_els->resp = &fc_req->sg_rsp;707 708 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,709 ZFCP_FC_CTELS_TMO);710 if (!ret)711 wait_for_completion(&completion);712 return ret;713}714 715static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)716{717 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))718 return;719 720 atomic_andnot(ZFCP_STATUS_COMMON_NOESC, &port->status);721 722 if ((port->supported_classes != 0) ||723 !list_empty(&port->unit_list))724 return;725 726 list_move_tail(&port->list, lh);727}728 729static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,730 struct zfcp_adapter *adapter, int max_entries)731{732 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;733 struct scatterlist *sg = &fc_req->sg_rsp;734 struct fc_ct_hdr *hdr = sg_virt(sg);735 struct fc_gpn_ft_resp *acc = sg_virt(sg);736 struct zfcp_port *port, *tmp;737 unsigned long flags;738 LIST_HEAD(remove_lh);739 u32 d_id;740 int ret = 0, x, last = 0;741 742 if (ct_els->status)743 return -EIO;744 745 if (hdr->ct_cmd != cpu_to_be16(FC_FS_ACC)) {746 if (hdr->ct_reason == FC_FS_RJT_UNABL)747 return -EAGAIN; /* might be a temporary condition */748 return -EIO;749 }750 751 if (hdr->ct_mr_size) {752 dev_warn(&adapter->ccw_device->dev,753 "The name server reported %d words residual data\n",754 hdr->ct_mr_size);755 return -E2BIG;756 }757 758 /* first entry is the header */759 for (x = 1; x < max_entries && !last; x++) {760 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))761 acc++;762 else763 acc = sg_virt(++sg);764 765 last = acc->fp_flags & FC_NS_FID_LAST;766 d_id = ntoh24(acc->fp_fid);767 768 /* don't attach ports with a well known address */769 if (d_id >= FC_FID_WELL_KNOWN_BASE)770 continue;771 /* skip the adapter's port and known remote ports */772 if (be64_to_cpu(acc->fp_wwpn) ==773 fc_host_port_name(adapter->scsi_host))774 continue;775 776 port = zfcp_port_enqueue(adapter, be64_to_cpu(acc->fp_wwpn),777 ZFCP_STATUS_COMMON_NOESC, d_id);778 if (!IS_ERR(port))779 zfcp_erp_port_reopen(port, 0, "fcegpf1");780 else if (PTR_ERR(port) != -EEXIST)781 ret = PTR_ERR(port);782 }783 784 zfcp_erp_wait(adapter);785 write_lock_irqsave(&adapter->port_list_lock, flags);786 list_for_each_entry_safe(port, tmp, &adapter->port_list, list)787 zfcp_fc_validate_port(port, &remove_lh);788 write_unlock_irqrestore(&adapter->port_list_lock, flags);789 790 list_for_each_entry_safe(port, tmp, &remove_lh, list) {791 zfcp_erp_port_shutdown(port, 0, "fcegpf2");792 device_unregister(&port->dev);793 }794 795 return ret;796}797 798/**799 * zfcp_fc_scan_ports - scan remote ports and attach new ports800 * @work: reference to scheduled work801 */802void zfcp_fc_scan_ports(struct work_struct *work)803{804 struct delayed_work *dw = to_delayed_work(work);805 struct zfcp_adapter *adapter = container_of(dw, struct zfcp_adapter,806 scan_work);807 int ret, i;808 struct zfcp_fc_req *fc_req;809 int chain, max_entries, buf_num, max_bytes;810 811 zfcp_fc_port_scan_time(adapter);812 813 chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;814 buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1;815 max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE;816 max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE;817 818 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&819 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)820 return;821 822 if (zfcp_fc_wka_port_get(&adapter->gs->ds))823 return;824 825 fc_req = zfcp_fc_alloc_sg_env(buf_num);826 if (!fc_req)827 goto out;828 829 for (i = 0; i < 3; i++) {830 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes);831 if (!ret) {832 ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries);833 if (ret == -EAGAIN)834 ssleep(1);835 else836 break;837 }838 }839 zfcp_fc_sg_free_table(&fc_req->sg_rsp, buf_num);840 kmem_cache_free(zfcp_fc_req_cache, fc_req);841out:842 zfcp_fc_wka_port_put(&adapter->gs->ds);843}844 845static int zfcp_fc_gspn(struct zfcp_adapter *adapter,846 struct zfcp_fc_req *fc_req)847{848 DECLARE_COMPLETION_ONSTACK(completion);849 char devno[] = "DEVNO:";850 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;851 struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req;852 struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp;853 int ret;854 855 zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID,856 FC_SYMBOLIC_NAME_SIZE);857 hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host));858 859 sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req));860 sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp));861 862 ct_els->handler = zfcp_fc_complete;863 ct_els->handler_data = &completion;864 ct_els->req = &fc_req->sg_req;865 ct_els->resp = &fc_req->sg_rsp;866 867 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,868 ZFCP_FC_CTELS_TMO);869 if (ret)870 return ret;871 872 wait_for_completion(&completion);873 if (ct_els->status)874 return ct_els->status;875 876 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV &&877 !(strstr(gspn_rsp->gspn.fp_name, devno)))878 snprintf(fc_host_symbolic_name(adapter->scsi_host),879 FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s",880 gspn_rsp->gspn.fp_name, devno,881 dev_name(&adapter->ccw_device->dev),882 init_utsname()->nodename);883 else884 strscpy(fc_host_symbolic_name(adapter->scsi_host),885 gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE);886 887 return 0;888}889 890static void zfcp_fc_rspn(struct zfcp_adapter *adapter,891 struct zfcp_fc_req *fc_req)892{893 DECLARE_COMPLETION_ONSTACK(completion);894 struct Scsi_Host *shost = adapter->scsi_host;895 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;896 struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req;897 struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp;898 int ret, len;899 900 zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID,901 FC_SYMBOLIC_NAME_SIZE);902 hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost));903 904 BUILD_BUG_ON(sizeof(rspn_req->name) !=905 sizeof(fc_host_symbolic_name(shost)));906 BUILD_BUG_ON(sizeof(rspn_req->name) !=907 type_max(typeof(rspn_req->rspn.fr_name_len)) + 1);908 len = strscpy(rspn_req->name, fc_host_symbolic_name(shost),909 sizeof(rspn_req->name));910 /*911 * It should be impossible for this to truncate (see BUILD_BUG_ON()912 * above), but be robust anyway.913 */914 if (WARN_ON(len < 0))915 len = sizeof(rspn_req->name) - 1;916 rspn_req->rspn.fr_name_len = len;917 918 sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req));919 sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp));920 921 ct_els->handler = zfcp_fc_complete;922 ct_els->handler_data = &completion;923 ct_els->req = &fc_req->sg_req;924 ct_els->resp = &fc_req->sg_rsp;925 926 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,927 ZFCP_FC_CTELS_TMO);928 if (!ret)929 wait_for_completion(&completion);930}931 932/**933 * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name934 * @work: ns_up_work of the adapter where to update the symbolic port name935 *936 * Retrieve the current symbolic port name that may have been set by937 * the hardware using the GSPN request and update the fc_host938 * symbolic_name sysfs attribute. When running in NPIV mode (and hence939 * the port name is unique for this system), update the symbolic port940 * name to add Linux specific information and update the FC nameserver941 * using the RSPN request.942 */943void zfcp_fc_sym_name_update(struct work_struct *work)944{945 struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,946 ns_up_work);947 int ret;948 struct zfcp_fc_req *fc_req;949 950 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&951 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)952 return;953 954 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);955 if (!fc_req)956 return;957 958 ret = zfcp_fc_wka_port_get(&adapter->gs->ds);959 if (ret)960 goto out_free;961 962 ret = zfcp_fc_gspn(adapter, fc_req);963 if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)964 goto out_ds_put;965 966 memset(fc_req, 0, sizeof(*fc_req));967 zfcp_fc_rspn(adapter, fc_req);968 969out_ds_put:970 zfcp_fc_wka_port_put(&adapter->gs->ds);971out_free:972 kmem_cache_free(zfcp_fc_req_cache, fc_req);973}974 975static void zfcp_fc_ct_els_job_handler(void *data)976{977 struct bsg_job *job = data;978 struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data;979 struct fc_bsg_reply *jr = job->reply;980 981 jr->reply_payload_rcv_len = job->reply_payload.payload_len;982 jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;983 jr->result = zfcp_ct_els->status ? -EIO : 0;984 bsg_job_done(job, jr->result, jr->reply_payload_rcv_len);985}986 987static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct bsg_job *job)988{989 u32 preamble_word1;990 u8 gs_type;991 struct zfcp_adapter *adapter;992 struct fc_bsg_request *bsg_request = job->request;993 struct fc_rport *rport = fc_bsg_to_rport(job);994 struct Scsi_Host *shost;995 996 preamble_word1 = bsg_request->rqst_data.r_ct.preamble_word1;997 gs_type = (preamble_word1 & 0xff000000) >> 24;998 999 shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);1000 adapter = (struct zfcp_adapter *) shost->hostdata[0];1001 1002 switch (gs_type) {1003 case FC_FST_ALIAS:1004 return &adapter->gs->as;1005 case FC_FST_MGMT:1006 return &adapter->gs->ms;1007 case FC_FST_TIME:1008 return &adapter->gs->ts;1009 break;1010 case FC_FST_DIR:1011 return &adapter->gs->ds;1012 break;1013 default:1014 return NULL;1015 }1016}1017 1018static void zfcp_fc_ct_job_handler(void *data)1019{1020 struct bsg_job *job = data;1021 struct zfcp_fc_wka_port *wka_port;1022 1023 wka_port = zfcp_fc_job_wka_port(job);1024 zfcp_fc_wka_port_put(wka_port);1025 1026 zfcp_fc_ct_els_job_handler(data);1027}1028 1029static int zfcp_fc_exec_els_job(struct bsg_job *job,1030 struct zfcp_adapter *adapter)1031{1032 struct zfcp_fsf_ct_els *els = job->dd_data;1033 struct fc_rport *rport = fc_bsg_to_rport(job);1034 struct fc_bsg_request *bsg_request = job->request;1035 struct zfcp_port *port;1036 u32 d_id;1037 1038 if (rport) {1039 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);1040 if (!port)1041 return -EINVAL;1042 1043 d_id = port->d_id;1044 put_device(&port->dev);1045 } else1046 d_id = ntoh24(bsg_request->rqst_data.h_els.port_id);1047 1048 els->handler = zfcp_fc_ct_els_job_handler;1049 return zfcp_fsf_send_els(adapter, d_id, els, job->timeout / HZ);1050}1051 1052static int zfcp_fc_exec_ct_job(struct bsg_job *job,1053 struct zfcp_adapter *adapter)1054{1055 int ret;1056 struct zfcp_fsf_ct_els *ct = job->dd_data;1057 struct zfcp_fc_wka_port *wka_port;1058 1059 wka_port = zfcp_fc_job_wka_port(job);1060 if (!wka_port)1061 return -EINVAL;1062 1063 ret = zfcp_fc_wka_port_get(wka_port);1064 if (ret)1065 return ret;1066 1067 ct->handler = zfcp_fc_ct_job_handler;1068 ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->timeout / HZ);1069 if (ret)1070 zfcp_fc_wka_port_put(wka_port);1071 1072 return ret;1073}1074 1075int zfcp_fc_exec_bsg_job(struct bsg_job *job)1076{1077 struct Scsi_Host *shost;1078 struct zfcp_adapter *adapter;1079 struct zfcp_fsf_ct_els *ct_els = job->dd_data;1080 struct fc_bsg_request *bsg_request = job->request;1081 struct fc_rport *rport = fc_bsg_to_rport(job);1082 1083 shost = rport ? rport_to_shost(rport) : fc_bsg_to_shost(job);1084 adapter = (struct zfcp_adapter *)shost->hostdata[0];1085 1086 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))1087 return -EINVAL;1088 1089 ct_els->req = job->request_payload.sg_list;1090 ct_els->resp = job->reply_payload.sg_list;1091 ct_els->handler_data = job;1092 1093 switch (bsg_request->msgcode) {1094 case FC_BSG_RPT_ELS:1095 case FC_BSG_HST_ELS_NOLOGIN:1096 return zfcp_fc_exec_els_job(job, adapter);1097 case FC_BSG_RPT_CT:1098 case FC_BSG_HST_CT:1099 return zfcp_fc_exec_ct_job(job, adapter);1100 default:1101 return -EINVAL;1102 }1103}1104 1105int zfcp_fc_timeout_bsg_job(struct bsg_job *job)1106{1107 /* hardware tracks timeout, reset bsg timeout to not interfere */1108 return -EAGAIN;1109}1110 1111int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)1112{1113 struct zfcp_fc_wka_ports *wka_ports;1114 1115 wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL);1116 if (!wka_ports)1117 return -ENOMEM;1118 1119 adapter->gs = wka_ports;1120 zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);1121 zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);1122 zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);1123 zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);1124 1125 return 0;1126}1127 1128void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)1129{1130 kfree(adapter->gs);1131 adapter->gs = NULL;1132}1133 1134