4 * Fibre Channel related functions for the zfcp device driver.
6 * Copyright IBM Corporation 2008
9 #define KMSG_COMPONENT "zfcp"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 enum rscn_address_format {
15 RSCN_PORT_ADDRESS = 0x0,
16 RSCN_AREA_ADDRESS = 0x1,
17 RSCN_DOMAIN_ADDRESS = 0x2,
18 RSCN_FABRIC_ADDRESS = 0x3,
21 static u32 rscn_range_mask[] = {
22 [RSCN_PORT_ADDRESS] = 0xFFFFFF,
23 [RSCN_AREA_ADDRESS] = 0xFFFF00,
24 [RSCN_DOMAIN_ADDRESS] = 0xFF0000,
25 [RSCN_FABRIC_ADDRESS] = 0x000000,
28 struct ct_iu_gpn_ft_req {
34 } __attribute__ ((packed));
36 struct gpn_ft_resp_acc {
41 } __attribute__ ((packed));
43 #define ZFCP_CT_SIZE_ONE_PAGE (PAGE_SIZE - sizeof(struct ct_hdr))
44 #define ZFCP_GPN_FT_ENTRIES (ZFCP_CT_SIZE_ONE_PAGE \
45 / sizeof(struct gpn_ft_resp_acc))
46 #define ZFCP_GPN_FT_BUFFERS 4
47 #define ZFCP_GPN_FT_MAX_SIZE (ZFCP_GPN_FT_BUFFERS * PAGE_SIZE \
48 - sizeof(struct ct_hdr))
49 #define ZFCP_GPN_FT_MAX_ENTRIES ZFCP_GPN_FT_BUFFERS * (ZFCP_GPN_FT_ENTRIES + 1)
51 struct ct_iu_gpn_ft_resp {
53 struct gpn_ft_resp_acc accept[ZFCP_GPN_FT_ENTRIES];
54 } __attribute__ ((packed));
57 struct zfcp_send_ct ct;
58 struct scatterlist sg_req;
59 struct scatterlist sg_resp[ZFCP_GPN_FT_BUFFERS];
62 struct zfcp_fc_ns_handler_data {
63 struct completion done;
64 void (*handler)(unsigned long);
65 unsigned long handler_data;
68 static int zfcp_wka_port_get(struct zfcp_wka_port *wka_port)
70 if (mutex_lock_interruptible(&wka_port->mutex))
73 if (wka_port->status == ZFCP_WKA_PORT_OFFLINE ||
74 wka_port->status == ZFCP_WKA_PORT_CLOSING) {
75 wka_port->status = ZFCP_WKA_PORT_OPENING;
76 if (zfcp_fsf_open_wka_port(wka_port))
77 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
80 mutex_unlock(&wka_port->mutex);
83 wka_port->completion_wq,
84 wka_port->status == ZFCP_WKA_PORT_ONLINE ||
85 wka_port->status == ZFCP_WKA_PORT_OFFLINE,
88 if (wka_port->status == ZFCP_WKA_PORT_ONLINE) {
89 atomic_inc(&wka_port->refcount);
95 static void zfcp_wka_port_offline(struct work_struct *work)
97 struct delayed_work *dw = container_of(work, struct delayed_work, work);
98 struct zfcp_wka_port *wka_port =
99 container_of(dw, struct zfcp_wka_port, work);
101 wait_event(wka_port->completion_wq,
102 atomic_read(&wka_port->refcount) == 0);
104 mutex_lock(&wka_port->mutex);
105 if ((atomic_read(&wka_port->refcount) != 0) ||
106 (wka_port->status != ZFCP_WKA_PORT_ONLINE))
109 wka_port->status = ZFCP_WKA_PORT_CLOSING;
110 if (zfcp_fsf_close_wka_port(wka_port)) {
111 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
112 wake_up(&wka_port->completion_wq);
115 mutex_unlock(&wka_port->mutex);
118 static void zfcp_wka_port_put(struct zfcp_wka_port *wka_port)
120 if (atomic_dec_return(&wka_port->refcount) != 0)
122 /* wait 10 miliseconds, other reqs might pop in */
123 schedule_delayed_work(&wka_port->work, HZ / 100);
126 void zfcp_fc_nameserver_init(struct zfcp_adapter *adapter)
128 struct zfcp_wka_port *wka_port = &adapter->nsp;
130 init_waitqueue_head(&wka_port->completion_wq);
132 wka_port->adapter = adapter;
133 wka_port->d_id = ZFCP_DID_DIRECTORY_SERVICE;
135 wka_port->status = ZFCP_WKA_PORT_OFFLINE;
136 atomic_set(&wka_port->refcount, 0);
137 mutex_init(&wka_port->mutex);
138 INIT_DELAYED_WORK(&wka_port->work, zfcp_wka_port_offline);
141 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
142 struct fcp_rscn_element *elem)
145 struct zfcp_port *port;
147 read_lock_irqsave(&zfcp_data.config_lock, flags);
148 list_for_each_entry(port, &fsf_req->adapter->port_list_head, list) {
149 if (!(atomic_read(&port->status) & ZFCP_STATUS_PORT_PHYS_OPEN))
150 /* Try to connect to unused ports anyway. */
151 zfcp_erp_port_reopen(port,
152 ZFCP_STATUS_COMMON_ERP_FAILED,
154 else if ((port->d_id & range) == (elem->nport_did & range))
155 /* Check connection status for connected ports */
156 zfcp_test_link(port);
158 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
161 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
163 struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
164 struct fcp_rscn_head *fcp_rscn_head;
165 struct fcp_rscn_element *fcp_rscn_element;
170 fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload.data;
171 fcp_rscn_element = (struct fcp_rscn_element *) fcp_rscn_head;
174 no_entries = fcp_rscn_head->payload_len /
175 sizeof(struct fcp_rscn_element);
177 for (i = 1; i < no_entries; i++) {
178 /* skip head and start with 1st element */
180 range_mask = rscn_range_mask[fcp_rscn_element->addr_format];
181 _zfcp_fc_incoming_rscn(fsf_req, range_mask, fcp_rscn_element);
183 schedule_work(&fsf_req->adapter->scan_work);
186 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
188 struct zfcp_adapter *adapter = req->adapter;
189 struct zfcp_port *port;
192 read_lock_irqsave(&zfcp_data.config_lock, flags);
193 list_for_each_entry(port, &adapter->port_list_head, list)
194 if (port->wwpn == wwpn)
196 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
198 if (port && (port->wwpn == wwpn))
199 zfcp_erp_port_forced_reopen(port, 0, 83, req);
202 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
204 struct fsf_status_read_buffer *status_buffer =
205 (struct fsf_status_read_buffer *)req->data;
206 struct fsf_plogi *els_plogi =
207 (struct fsf_plogi *) status_buffer->payload.data;
209 zfcp_fc_incoming_wwpn(req, els_plogi->serv_param.wwpn);
212 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
214 struct fsf_status_read_buffer *status_buffer =
215 (struct fsf_status_read_buffer *)req->data;
216 struct fcp_logo *els_logo =
217 (struct fcp_logo *) status_buffer->payload.data;
219 zfcp_fc_incoming_wwpn(req, els_logo->nport_wwpn);
223 * zfcp_fc_incoming_els - handle incoming ELS
224 * @fsf_req - request which contains incoming ELS
226 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
228 struct fsf_status_read_buffer *status_buffer =
229 (struct fsf_status_read_buffer *) fsf_req->data;
230 unsigned int els_type = status_buffer->payload.data[0];
232 zfcp_san_dbf_event_incoming_els(fsf_req);
233 if (els_type == LS_PLOGI)
234 zfcp_fc_incoming_plogi(fsf_req);
235 else if (els_type == LS_LOGO)
236 zfcp_fc_incoming_logo(fsf_req);
237 else if (els_type == LS_RSCN)
238 zfcp_fc_incoming_rscn(fsf_req);
241 static void zfcp_fc_ns_handler(unsigned long data)
243 struct zfcp_fc_ns_handler_data *compl_rec =
244 (struct zfcp_fc_ns_handler_data *) data;
246 if (compl_rec->handler)
247 compl_rec->handler(compl_rec->handler_data);
249 complete(&compl_rec->done);
252 static void zfcp_fc_ns_gid_pn_eval(unsigned long data)
254 struct zfcp_gid_pn_data *gid_pn = (struct zfcp_gid_pn_data *) data;
255 struct zfcp_send_ct *ct = &gid_pn->ct;
256 struct ct_iu_gid_pn_req *ct_iu_req = sg_virt(ct->req);
257 struct ct_iu_gid_pn_resp *ct_iu_resp = sg_virt(ct->resp);
258 struct zfcp_port *port = gid_pn->port;
262 if (ct_iu_resp->header.cmd_rsp_code != ZFCP_CT_ACCEPT)
266 if (ct_iu_req->wwpn != port->wwpn)
268 /* looks like a valid d_id */
269 port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
272 int static zfcp_fc_ns_gid_pn_request(struct zfcp_erp_action *erp_action,
273 struct zfcp_gid_pn_data *gid_pn)
275 struct zfcp_adapter *adapter = erp_action->adapter;
276 struct zfcp_fc_ns_handler_data compl_rec;
279 /* setup parameters for send generic command */
280 gid_pn->port = erp_action->port;
281 gid_pn->ct.wka_port = &adapter->nsp;
282 gid_pn->ct.handler = zfcp_fc_ns_handler;
283 gid_pn->ct.handler_data = (unsigned long) &compl_rec;
284 gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
285 gid_pn->ct.req = &gid_pn->req;
286 gid_pn->ct.resp = &gid_pn->resp;
287 sg_init_one(&gid_pn->req, &gid_pn->ct_iu_req,
288 sizeof(struct ct_iu_gid_pn_req));
289 sg_init_one(&gid_pn->resp, &gid_pn->ct_iu_resp,
290 sizeof(struct ct_iu_gid_pn_resp));
292 /* setup nameserver request */
293 gid_pn->ct_iu_req.header.revision = ZFCP_CT_REVISION;
294 gid_pn->ct_iu_req.header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
295 gid_pn->ct_iu_req.header.gs_subtype = ZFCP_CT_NAME_SERVER;
296 gid_pn->ct_iu_req.header.options = ZFCP_CT_SYNCHRONOUS;
297 gid_pn->ct_iu_req.header.cmd_rsp_code = ZFCP_CT_GID_PN;
298 gid_pn->ct_iu_req.header.max_res_size = ZFCP_CT_SIZE_ONE_PAGE / 4;
299 gid_pn->ct_iu_req.wwpn = erp_action->port->wwpn;
301 init_completion(&compl_rec.done);
302 compl_rec.handler = zfcp_fc_ns_gid_pn_eval;
303 compl_rec.handler_data = (unsigned long) gid_pn;
304 ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
307 wait_for_completion(&compl_rec.done);
312 * zfcp_fc_ns_gid_pn_request - initiate GID_PN nameserver request
313 * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
314 * return: -ENOMEM on error, 0 otherwise
316 int zfcp_fc_ns_gid_pn(struct zfcp_erp_action *erp_action)
319 struct zfcp_gid_pn_data *gid_pn;
320 struct zfcp_adapter *adapter = erp_action->adapter;
322 gid_pn = mempool_alloc(adapter->pool.data_gid_pn, GFP_ATOMIC);
326 memset(gid_pn, 0, sizeof(*gid_pn));
328 ret = zfcp_wka_port_get(&adapter->nsp);
332 ret = zfcp_fc_ns_gid_pn_request(erp_action, gid_pn);
334 zfcp_wka_port_put(&adapter->nsp);
336 mempool_free(gid_pn, adapter->pool.data_gid_pn);
341 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
342 * @port: zfcp_port structure
343 * @plogi: plogi payload
345 * Evaluate PLOGI playload and copy important fields into zfcp_port structure
347 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
349 port->maxframe_size = plogi->serv_param.common_serv_param[7] |
350 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
351 if (plogi->serv_param.class1_serv_param[0] & 0x80)
352 port->supported_classes |= FC_COS_CLASS1;
353 if (plogi->serv_param.class2_serv_param[0] & 0x80)
354 port->supported_classes |= FC_COS_CLASS2;
355 if (plogi->serv_param.class3_serv_param[0] & 0x80)
356 port->supported_classes |= FC_COS_CLASS3;
357 if (plogi->serv_param.class4_serv_param[0] & 0x80)
358 port->supported_classes |= FC_COS_CLASS4;
361 struct zfcp_els_adisc {
362 struct zfcp_send_els els;
363 struct scatterlist req;
364 struct scatterlist resp;
365 struct zfcp_ls_adisc ls_adisc;
366 struct zfcp_ls_adisc ls_adisc_acc;
369 static void zfcp_fc_adisc_handler(unsigned long data)
371 struct zfcp_els_adisc *adisc = (struct zfcp_els_adisc *) data;
372 struct zfcp_port *port = adisc->els.port;
373 struct zfcp_ls_adisc *ls_adisc = &adisc->ls_adisc_acc;
375 if (adisc->els.status) {
376 /* request rejected or timed out */
377 zfcp_erp_port_forced_reopen(port, 0, 63, NULL);
382 port->wwnn = ls_adisc->wwnn;
384 if (port->wwpn != ls_adisc->wwpn)
385 zfcp_erp_port_reopen(port, 0, 64, NULL);
392 static int zfcp_fc_adisc(struct zfcp_port *port)
394 struct zfcp_els_adisc *adisc;
395 struct zfcp_adapter *adapter = port->adapter;
397 adisc = kzalloc(sizeof(struct zfcp_els_adisc), GFP_ATOMIC);
401 adisc->els.req = &adisc->req;
402 adisc->els.resp = &adisc->resp;
403 sg_init_one(adisc->els.req, &adisc->ls_adisc,
404 sizeof(struct zfcp_ls_adisc));
405 sg_init_one(adisc->els.resp, &adisc->ls_adisc_acc,
406 sizeof(struct zfcp_ls_adisc));
408 adisc->els.adapter = adapter;
409 adisc->els.port = port;
410 adisc->els.d_id = port->d_id;
411 adisc->els.handler = zfcp_fc_adisc_handler;
412 adisc->els.handler_data = (unsigned long) adisc;
413 adisc->els.ls_code = adisc->ls_adisc.code = ZFCP_LS_ADISC;
415 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
416 without FC-AL-2 capability, so we don't set it */
417 adisc->ls_adisc.wwpn = fc_host_port_name(adapter->scsi_host);
418 adisc->ls_adisc.wwnn = fc_host_node_name(adapter->scsi_host);
419 adisc->ls_adisc.nport_id = fc_host_port_id(adapter->scsi_host);
421 return zfcp_fsf_send_els(&adisc->els);
424 void zfcp_fc_link_test_work(struct work_struct *work)
426 struct zfcp_port *port =
427 container_of(work, struct zfcp_port, test_link_work);
430 retval = zfcp_fc_adisc(port);
434 /* send of ADISC was not possible */
436 if (retval != -EBUSY)
437 zfcp_erp_port_forced_reopen(port, 0, 65, NULL);
441 * zfcp_test_link - lightweight link test procedure
442 * @port: port to be tested
444 * Test status of a link to a remote port using the ELS command ADISC.
445 * If there is a problem with the remote port, error recovery steps
448 void zfcp_test_link(struct zfcp_port *port)
451 if (!queue_work(zfcp_data.work_queue, &port->test_link_work))
455 static void zfcp_free_sg_env(struct zfcp_gpn_ft *gpn_ft, int buf_num)
457 struct scatterlist *sg = &gpn_ft->sg_req;
459 kfree(sg_virt(sg)); /* free request buffer */
460 zfcp_sg_free_table(gpn_ft->sg_resp, buf_num);
465 static struct zfcp_gpn_ft *zfcp_alloc_sg_env(int buf_num)
467 struct zfcp_gpn_ft *gpn_ft;
468 struct ct_iu_gpn_ft_req *req;
470 gpn_ft = kzalloc(sizeof(*gpn_ft), GFP_KERNEL);
474 req = kzalloc(sizeof(struct ct_iu_gpn_ft_req), GFP_KERNEL);
480 sg_init_one(&gpn_ft->sg_req, req, sizeof(*req));
482 if (zfcp_sg_setup_table(gpn_ft->sg_resp, buf_num)) {
483 zfcp_free_sg_env(gpn_ft, buf_num);
491 static int zfcp_scan_issue_gpn_ft(struct zfcp_gpn_ft *gpn_ft,
492 struct zfcp_adapter *adapter,
495 struct zfcp_send_ct *ct = &gpn_ft->ct;
496 struct ct_iu_gpn_ft_req *req = sg_virt(&gpn_ft->sg_req);
497 struct zfcp_fc_ns_handler_data compl_rec;
500 /* prepare CT IU for GPN_FT */
501 req->header.revision = ZFCP_CT_REVISION;
502 req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
503 req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
504 req->header.options = ZFCP_CT_SYNCHRONOUS;
505 req->header.cmd_rsp_code = ZFCP_CT_GPN_FT;
506 req->header.max_res_size = max_bytes / 4;
508 req->domain_id_scope = 0;
509 req->area_id_scope = 0;
510 req->fc4_type = ZFCP_CT_SCSI_FCP;
512 /* prepare zfcp_send_ct */
513 ct->wka_port = &adapter->nsp;
514 ct->handler = zfcp_fc_ns_handler;
515 ct->handler_data = (unsigned long)&compl_rec;
517 ct->req = &gpn_ft->sg_req;
518 ct->resp = gpn_ft->sg_resp;
520 init_completion(&compl_rec.done);
521 compl_rec.handler = NULL;
522 ret = zfcp_fsf_send_ct(ct, NULL, NULL);
524 wait_for_completion(&compl_rec.done);
528 static void zfcp_validate_port(struct zfcp_port *port)
530 struct zfcp_adapter *adapter = port->adapter;
532 atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
534 if ((port->supported_classes != 0) ||
535 !list_empty(&port->unit_list_head)) {
539 zfcp_erp_port_shutdown(port, 0, 151, NULL);
540 zfcp_erp_wait(adapter);
542 zfcp_port_dequeue(port);
545 static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft, int max_entries)
547 struct zfcp_send_ct *ct = &gpn_ft->ct;
548 struct scatterlist *sg = gpn_ft->sg_resp;
549 struct ct_hdr *hdr = sg_virt(sg);
550 struct gpn_ft_resp_acc *acc = sg_virt(sg);
551 struct zfcp_adapter *adapter = ct->wka_port->adapter;
552 struct zfcp_port *port, *tmp;
554 int ret = 0, x, last = 0;
559 if (hdr->cmd_rsp_code != ZFCP_CT_ACCEPT) {
560 if (hdr->reason_code == ZFCP_CT_UNABLE_TO_PERFORM_CMD)
561 return -EAGAIN; /* might be a temporary condition */
565 if (hdr->max_res_size) {
566 dev_warn(&adapter->ccw_device->dev,
567 "The name server reported %d words residual data\n",
572 down(&zfcp_data.config_sema);
574 /* first entry is the header */
575 for (x = 1; x < max_entries && !last; x++) {
576 if (x % (ZFCP_GPN_FT_ENTRIES + 1))
581 last = acc->control & 0x80;
582 d_id = acc->port_id[0] << 16 | acc->port_id[1] << 8 |
585 /* don't attach ports with a well known address */
586 if ((d_id & ZFCP_DID_WKA) == ZFCP_DID_WKA)
588 /* skip the adapter's port and known remote ports */
589 if (acc->wwpn == fc_host_port_name(adapter->scsi_host))
591 port = zfcp_get_port_by_wwpn(adapter, acc->wwpn);
597 port = zfcp_port_enqueue(adapter, acc->wwpn,
598 ZFCP_STATUS_COMMON_NOESC, d_id);
602 zfcp_erp_port_reopen(port, 0, 149, NULL);
605 zfcp_erp_wait(adapter);
606 list_for_each_entry_safe(port, tmp, &adapter->port_list_head, list)
607 zfcp_validate_port(port);
608 up(&zfcp_data.config_sema);
613 * zfcp_scan_ports - scan remote ports and attach new ports
614 * @adapter: pointer to struct zfcp_adapter
616 int zfcp_scan_ports(struct zfcp_adapter *adapter)
619 struct zfcp_gpn_ft *gpn_ft;
620 int chain, max_entries, buf_num, max_bytes;
622 chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
623 buf_num = chain ? ZFCP_GPN_FT_BUFFERS : 1;
624 max_entries = chain ? ZFCP_GPN_FT_MAX_ENTRIES : ZFCP_GPN_FT_ENTRIES;
625 max_bytes = chain ? ZFCP_GPN_FT_MAX_SIZE : ZFCP_CT_SIZE_ONE_PAGE;
627 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT)
630 ret = zfcp_wka_port_get(&adapter->nsp);
634 gpn_ft = zfcp_alloc_sg_env(buf_num);
640 for (i = 0; i < 3; i++) {
641 ret = zfcp_scan_issue_gpn_ft(gpn_ft, adapter, max_bytes);
643 ret = zfcp_scan_eval_gpn_ft(gpn_ft, max_entries);
650 zfcp_free_sg_env(gpn_ft, buf_num);
652 zfcp_wka_port_put(&adapter->nsp);
657 void _zfcp_scan_ports_later(struct work_struct *work)
659 zfcp_scan_ports(container_of(work, struct zfcp_adapter, scan_work));