1 /*
2 * zfcp device driver
3 *
4 * Fibre Channel related functions for the zfcp device driver.
5 *
6 * Copyright IBM Corporation 2008, 2010
7 */
8
9 #define KMSG_COMPONENT "zfcp"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12 #include <linux/types.h>
13 #include <linux/slab.h>
14 #include <linux/utsname.h>
15 #include <scsi/fc/fc_els.h>
16 #include <scsi/libfc.h>
17 #include "zfcp_ext.h"
18 #include "zfcp_fc.h"
19
20 struct kmem_cache *zfcp_fc_req_cache;
21
22 static u32 zfcp_fc_rscn_range_mask[] = {
23 [ELS_ADDR_FMT_PORT] = 0xFFFFFF,
24 [ELS_ADDR_FMT_AREA] = 0xFFFF00,
25 [ELS_ADDR_FMT_DOM] = 0xFF0000,
26 [ELS_ADDR_FMT_FAB] = 0x000000,
27 };
28
29 /**
30 * zfcp_fc_post_event - post event to userspace via fc_transport
31 * @work: work struct with enqueued events
32 */
zfcp_fc_post_event(struct work_struct * work)33 void zfcp_fc_post_event(struct work_struct *work)
34 {
35 struct zfcp_fc_event *event = NULL, *tmp = NULL;
36 LIST_HEAD(tmp_lh);
37 struct zfcp_fc_events *events = container_of(work,
38 struct zfcp_fc_events, work);
39 struct zfcp_adapter *adapter = container_of(events, struct zfcp_adapter,
40 events);
41
42 spin_lock_bh(&events->list_lock);
43 list_splice_init(&events->list, &tmp_lh);
44 spin_unlock_bh(&events->list_lock);
45
46 list_for_each_entry_safe(event, tmp, &tmp_lh, list) {
47 fc_host_post_event(adapter->scsi_host, fc_get_event_number(),
48 event->code, event->data);
49 list_del(&event->list);
50 kfree(event);
51 }
52
53 }
54
55 /**
56 * zfcp_fc_enqueue_event - safely enqueue FC HBA API event from irq context
57 * @adapter: The adapter where to enqueue the event
58 * @event_code: The event code (as defined in fc_host_event_code in
59 * scsi_transport_fc.h)
60 * @event_data: The event data (e.g. n_port page in case of els)
61 */
zfcp_fc_enqueue_event(struct zfcp_adapter * adapter,enum fc_host_event_code event_code,u32 event_data)62 void zfcp_fc_enqueue_event(struct zfcp_adapter *adapter,
63 enum fc_host_event_code event_code, u32 event_data)
64 {
65 struct zfcp_fc_event *event;
66
67 event = kmalloc(sizeof(struct zfcp_fc_event), GFP_ATOMIC);
68 if (!event)
69 return;
70
71 event->code = event_code;
72 event->data = event_data;
73
74 spin_lock(&adapter->events.list_lock);
75 list_add_tail(&event->list, &adapter->events.list);
76 spin_unlock(&adapter->events.list_lock);
77
78 queue_work(adapter->work_queue, &adapter->events.work);
79 }
80
zfcp_fc_wka_port_get(struct zfcp_fc_wka_port * wka_port)81 static int zfcp_fc_wka_port_get(struct zfcp_fc_wka_port *wka_port)
82 {
83 if (mutex_lock_interruptible(&wka_port->mutex))
84 return -ERESTARTSYS;
85
86 if (wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE ||
87 wka_port->status == ZFCP_FC_WKA_PORT_CLOSING) {
88 wka_port->status = ZFCP_FC_WKA_PORT_OPENING;
89 if (zfcp_fsf_open_wka_port(wka_port))
90 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
91 }
92
93 mutex_unlock(&wka_port->mutex);
94
95 wait_event(wka_port->completion_wq,
96 wka_port->status == ZFCP_FC_WKA_PORT_ONLINE ||
97 wka_port->status == ZFCP_FC_WKA_PORT_OFFLINE);
98
99 if (wka_port->status == ZFCP_FC_WKA_PORT_ONLINE) {
100 atomic_inc(&wka_port->refcount);
101 return 0;
102 }
103 return -EIO;
104 }
105
zfcp_fc_wka_port_offline(struct work_struct * work)106 static void zfcp_fc_wka_port_offline(struct work_struct *work)
107 {
108 struct delayed_work *dw = to_delayed_work(work);
109 struct zfcp_fc_wka_port *wka_port =
110 container_of(dw, struct zfcp_fc_wka_port, work);
111
112 mutex_lock(&wka_port->mutex);
113 if ((atomic_read(&wka_port->refcount) != 0) ||
114 (wka_port->status != ZFCP_FC_WKA_PORT_ONLINE))
115 goto out;
116
117 wka_port->status = ZFCP_FC_WKA_PORT_CLOSING;
118 if (zfcp_fsf_close_wka_port(wka_port)) {
119 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
120 wake_up(&wka_port->completion_wq);
121 }
122 out:
123 mutex_unlock(&wka_port->mutex);
124 }
125
zfcp_fc_wka_port_put(struct zfcp_fc_wka_port * wka_port)126 static void zfcp_fc_wka_port_put(struct zfcp_fc_wka_port *wka_port)
127 {
128 if (atomic_dec_return(&wka_port->refcount) != 0)
129 return;
130 /* wait 10 milliseconds, other reqs might pop in */
131 schedule_delayed_work(&wka_port->work, HZ / 100);
132 }
133
zfcp_fc_wka_port_init(struct zfcp_fc_wka_port * wka_port,u32 d_id,struct zfcp_adapter * adapter)134 static void zfcp_fc_wka_port_init(struct zfcp_fc_wka_port *wka_port, u32 d_id,
135 struct zfcp_adapter *adapter)
136 {
137 init_waitqueue_head(&wka_port->completion_wq);
138
139 wka_port->adapter = adapter;
140 wka_port->d_id = d_id;
141
142 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
143 atomic_set(&wka_port->refcount, 0);
144 mutex_init(&wka_port->mutex);
145 INIT_DELAYED_WORK(&wka_port->work, zfcp_fc_wka_port_offline);
146 }
147
zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port * wka)148 static void zfcp_fc_wka_port_force_offline(struct zfcp_fc_wka_port *wka)
149 {
150 cancel_delayed_work_sync(&wka->work);
151 mutex_lock(&wka->mutex);
152 wka->status = ZFCP_FC_WKA_PORT_OFFLINE;
153 mutex_unlock(&wka->mutex);
154 }
155
zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports * gs)156 void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *gs)
157 {
158 if (!gs)
159 return;
160 zfcp_fc_wka_port_force_offline(&gs->ms);
161 zfcp_fc_wka_port_force_offline(&gs->ts);
162 zfcp_fc_wka_port_force_offline(&gs->ds);
163 zfcp_fc_wka_port_force_offline(&gs->as);
164 }
165
_zfcp_fc_incoming_rscn(struct zfcp_fsf_req * fsf_req,u32 range,struct fc_els_rscn_page * page)166 static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
167 struct fc_els_rscn_page *page)
168 {
169 unsigned long flags;
170 struct zfcp_adapter *adapter = fsf_req->adapter;
171 struct zfcp_port *port;
172
173 read_lock_irqsave(&adapter->port_list_lock, flags);
174 list_for_each_entry(port, &adapter->port_list, list) {
175 if ((port->d_id & range) == (ntoh24(page->rscn_fid) & range))
176 zfcp_fc_test_link(port);
177 if (!port->d_id)
178 zfcp_erp_port_reopen(port,
179 ZFCP_STATUS_COMMON_ERP_FAILED,
180 "fcrscn1");
181 }
182 read_unlock_irqrestore(&adapter->port_list_lock, flags);
183 }
184
zfcp_fc_incoming_rscn(struct zfcp_fsf_req * fsf_req)185 static void zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req)
186 {
187 struct fsf_status_read_buffer *status_buffer = (void *)fsf_req->data;
188 struct fc_els_rscn *head;
189 struct fc_els_rscn_page *page;
190 u16 i;
191 u16 no_entries;
192 unsigned int afmt;
193
194 head = (struct fc_els_rscn *) status_buffer->payload.data;
195 page = (struct fc_els_rscn_page *) head;
196
197 /* see FC-FS */
198 no_entries = head->rscn_plen / sizeof(struct fc_els_rscn_page);
199
200 for (i = 1; i < no_entries; i++) {
201 /* skip head and start with 1st element */
202 page++;
203 afmt = page->rscn_page_flags & ELS_RSCN_ADDR_FMT_MASK;
204 _zfcp_fc_incoming_rscn(fsf_req, zfcp_fc_rscn_range_mask[afmt],
205 page);
206 zfcp_fc_enqueue_event(fsf_req->adapter, FCH_EVT_RSCN,
207 *(u32 *)page);
208 }
209 queue_work(fsf_req->adapter->work_queue, &fsf_req->adapter->scan_work);
210 }
211
zfcp_fc_incoming_wwpn(struct zfcp_fsf_req * req,u64 wwpn)212 static void zfcp_fc_incoming_wwpn(struct zfcp_fsf_req *req, u64 wwpn)
213 {
214 unsigned long flags;
215 struct zfcp_adapter *adapter = req->adapter;
216 struct zfcp_port *port;
217
218 read_lock_irqsave(&adapter->port_list_lock, flags);
219 list_for_each_entry(port, &adapter->port_list, list)
220 if (port->wwpn == wwpn) {
221 zfcp_erp_port_forced_reopen(port, 0, "fciwwp1");
222 break;
223 }
224 read_unlock_irqrestore(&adapter->port_list_lock, flags);
225 }
226
zfcp_fc_incoming_plogi(struct zfcp_fsf_req * req)227 static void zfcp_fc_incoming_plogi(struct zfcp_fsf_req *req)
228 {
229 struct fsf_status_read_buffer *status_buffer;
230 struct fc_els_flogi *plogi;
231
232 status_buffer = (struct fsf_status_read_buffer *) req->data;
233 plogi = (struct fc_els_flogi *) status_buffer->payload.data;
234 zfcp_fc_incoming_wwpn(req, plogi->fl_wwpn);
235 }
236
zfcp_fc_incoming_logo(struct zfcp_fsf_req * req)237 static void zfcp_fc_incoming_logo(struct zfcp_fsf_req *req)
238 {
239 struct fsf_status_read_buffer *status_buffer =
240 (struct fsf_status_read_buffer *)req->data;
241 struct fc_els_logo *logo =
242 (struct fc_els_logo *) status_buffer->payload.data;
243
244 zfcp_fc_incoming_wwpn(req, logo->fl_n_port_wwn);
245 }
246
247 /**
248 * zfcp_fc_incoming_els - handle incoming ELS
249 * @fsf_req - request which contains incoming ELS
250 */
zfcp_fc_incoming_els(struct zfcp_fsf_req * fsf_req)251 void zfcp_fc_incoming_els(struct zfcp_fsf_req *fsf_req)
252 {
253 struct fsf_status_read_buffer *status_buffer =
254 (struct fsf_status_read_buffer *) fsf_req->data;
255 unsigned int els_type = status_buffer->payload.data[0];
256
257 zfcp_dbf_san_in_els("fciels1", fsf_req);
258 if (els_type == ELS_PLOGI)
259 zfcp_fc_incoming_plogi(fsf_req);
260 else if (els_type == ELS_LOGO)
261 zfcp_fc_incoming_logo(fsf_req);
262 else if (els_type == ELS_RSCN)
263 zfcp_fc_incoming_rscn(fsf_req);
264 }
265
zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req * fc_req)266 static void zfcp_fc_ns_gid_pn_eval(struct zfcp_fc_req *fc_req)
267 {
268 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
269 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
270
271 if (ct_els->status)
272 return;
273 if (gid_pn_rsp->ct_hdr.ct_cmd != FC_FS_ACC)
274 return;
275
276 /* looks like a valid d_id */
277 ct_els->port->d_id = ntoh24(gid_pn_rsp->gid_pn.fp_fid);
278 }
279
zfcp_fc_complete(void * data)280 static void zfcp_fc_complete(void *data)
281 {
282 complete(data);
283 }
284
zfcp_fc_ct_ns_init(struct fc_ct_hdr * ct_hdr,u16 cmd,u16 mr_size)285 static void zfcp_fc_ct_ns_init(struct fc_ct_hdr *ct_hdr, u16 cmd, u16 mr_size)
286 {
287 ct_hdr->ct_rev = FC_CT_REV;
288 ct_hdr->ct_fs_type = FC_FST_DIR;
289 ct_hdr->ct_fs_subtype = FC_NS_SUBTYPE;
290 ct_hdr->ct_cmd = cmd;
291 ct_hdr->ct_mr_size = mr_size / 4;
292 }
293
zfcp_fc_ns_gid_pn_request(struct zfcp_port * port,struct zfcp_fc_req * fc_req)294 static int zfcp_fc_ns_gid_pn_request(struct zfcp_port *port,
295 struct zfcp_fc_req *fc_req)
296 {
297 struct zfcp_adapter *adapter = port->adapter;
298 DECLARE_COMPLETION_ONSTACK(completion);
299 struct zfcp_fc_gid_pn_req *gid_pn_req = &fc_req->u.gid_pn.req;
300 struct zfcp_fc_gid_pn_rsp *gid_pn_rsp = &fc_req->u.gid_pn.rsp;
301 int ret;
302
303 /* setup parameters for send generic command */
304 fc_req->ct_els.port = port;
305 fc_req->ct_els.handler = zfcp_fc_complete;
306 fc_req->ct_els.handler_data = &completion;
307 fc_req->ct_els.req = &fc_req->sg_req;
308 fc_req->ct_els.resp = &fc_req->sg_rsp;
309 sg_init_one(&fc_req->sg_req, gid_pn_req, sizeof(*gid_pn_req));
310 sg_init_one(&fc_req->sg_rsp, gid_pn_rsp, sizeof(*gid_pn_rsp));
311
312 zfcp_fc_ct_ns_init(&gid_pn_req->ct_hdr,
313 FC_NS_GID_PN, ZFCP_FC_CT_SIZE_PAGE);
314 gid_pn_req->gid_pn.fn_wwpn = port->wwpn;
315
316 ret = zfcp_fsf_send_ct(&adapter->gs->ds, &fc_req->ct_els,
317 adapter->pool.gid_pn_req,
318 ZFCP_FC_CTELS_TMO);
319 if (!ret) {
320 wait_for_completion(&completion);
321 zfcp_fc_ns_gid_pn_eval(fc_req);
322 }
323 return ret;
324 }
325
326 /**
327 * zfcp_fc_ns_gid_pn - initiate GID_PN nameserver request
328 * @port: port where GID_PN request is needed
329 * return: -ENOMEM on error, 0 otherwise
330 */
zfcp_fc_ns_gid_pn(struct zfcp_port * port)331 static int zfcp_fc_ns_gid_pn(struct zfcp_port *port)
332 {
333 int ret;
334 struct zfcp_fc_req *fc_req;
335 struct zfcp_adapter *adapter = port->adapter;
336
337 fc_req = mempool_alloc(adapter->pool.gid_pn, GFP_ATOMIC);
338 if (!fc_req)
339 return -ENOMEM;
340
341 memset(fc_req, 0, sizeof(*fc_req));
342
343 ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
344 if (ret)
345 goto out;
346
347 ret = zfcp_fc_ns_gid_pn_request(port, fc_req);
348
349 zfcp_fc_wka_port_put(&adapter->gs->ds);
350 out:
351 mempool_free(fc_req, adapter->pool.gid_pn);
352 return ret;
353 }
354
zfcp_fc_port_did_lookup(struct work_struct * work)355 void zfcp_fc_port_did_lookup(struct work_struct *work)
356 {
357 int ret;
358 struct zfcp_port *port = container_of(work, struct zfcp_port,
359 gid_pn_work);
360
361 ret = zfcp_fc_ns_gid_pn(port);
362 if (ret) {
363 /* could not issue gid_pn for some reason */
364 zfcp_erp_adapter_reopen(port->adapter, 0, "fcgpn_1");
365 goto out;
366 }
367
368 if (!port->d_id) {
369 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
370 goto out;
371 }
372
373 zfcp_erp_port_reopen(port, 0, "fcgpn_3");
374 out:
375 put_device(&port->dev);
376 }
377
378 /**
379 * zfcp_fc_trigger_did_lookup - trigger the d_id lookup using a GID_PN request
380 * @port: The zfcp_port to lookup the d_id for.
381 */
zfcp_fc_trigger_did_lookup(struct zfcp_port * port)382 void zfcp_fc_trigger_did_lookup(struct zfcp_port *port)
383 {
384 get_device(&port->dev);
385 if (!queue_work(port->adapter->work_queue, &port->gid_pn_work))
386 put_device(&port->dev);
387 }
388
389 /**
390 * zfcp_fc_plogi_evaluate - evaluate PLOGI playload
391 * @port: zfcp_port structure
392 * @plogi: plogi payload
393 *
394 * Evaluate PLOGI playload and copy important fields into zfcp_port structure
395 */
zfcp_fc_plogi_evaluate(struct zfcp_port * port,struct fc_els_flogi * plogi)396 void zfcp_fc_plogi_evaluate(struct zfcp_port *port, struct fc_els_flogi *plogi)
397 {
398 if (plogi->fl_wwpn != port->wwpn) {
399 port->d_id = 0;
400 dev_warn(&port->adapter->ccw_device->dev,
401 "A port opened with WWPN 0x%016Lx returned data that "
402 "identifies it as WWPN 0x%016Lx\n",
403 (unsigned long long) port->wwpn,
404 (unsigned long long) plogi->fl_wwpn);
405 return;
406 }
407
408 port->wwnn = plogi->fl_wwnn;
409 port->maxframe_size = plogi->fl_csp.sp_bb_data;
410
411 if (plogi->fl_cssp[0].cp_class & FC_CPC_VALID)
412 port->supported_classes |= FC_COS_CLASS1;
413 if (plogi->fl_cssp[1].cp_class & FC_CPC_VALID)
414 port->supported_classes |= FC_COS_CLASS2;
415 if (plogi->fl_cssp[2].cp_class & FC_CPC_VALID)
416 port->supported_classes |= FC_COS_CLASS3;
417 if (plogi->fl_cssp[3].cp_class & FC_CPC_VALID)
418 port->supported_classes |= FC_COS_CLASS4;
419 }
420
zfcp_fc_adisc_handler(void * data)421 static void zfcp_fc_adisc_handler(void *data)
422 {
423 struct zfcp_fc_req *fc_req = data;
424 struct zfcp_port *port = fc_req->ct_els.port;
425 struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp;
426
427 if (fc_req->ct_els.status) {
428 /* request rejected or timed out */
429 zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
430 "fcadh_1");
431 goto out;
432 }
433
434 if (!port->wwnn)
435 port->wwnn = adisc_resp->adisc_wwnn;
436
437 if ((port->wwpn != adisc_resp->adisc_wwpn) ||
438 !(atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)) {
439 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
440 "fcadh_2");
441 goto out;
442 }
443
444 /* port is good, unblock rport without going through erp */
445 zfcp_scsi_schedule_rport_register(port);
446 out:
447 atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
448 put_device(&port->dev);
449 kmem_cache_free(zfcp_fc_req_cache, fc_req);
450 }
451
zfcp_fc_adisc(struct zfcp_port * port)452 static int zfcp_fc_adisc(struct zfcp_port *port)
453 {
454 struct zfcp_fc_req *fc_req;
455 struct zfcp_adapter *adapter = port->adapter;
456 struct Scsi_Host *shost = adapter->scsi_host;
457 int ret;
458
459 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC);
460 if (!fc_req)
461 return -ENOMEM;
462
463 fc_req->ct_els.port = port;
464 fc_req->ct_els.req = &fc_req->sg_req;
465 fc_req->ct_els.resp = &fc_req->sg_rsp;
466 sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req,
467 sizeof(struct fc_els_adisc));
468 sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp,
469 sizeof(struct fc_els_adisc));
470
471 fc_req->ct_els.handler = zfcp_fc_adisc_handler;
472 fc_req->ct_els.handler_data = fc_req;
473
474 /* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
475 without FC-AL-2 capability, so we don't set it */
476 fc_req->u.adisc.req.adisc_wwpn = fc_host_port_name(shost);
477 fc_req->u.adisc.req.adisc_wwnn = fc_host_node_name(shost);
478 fc_req->u.adisc.req.adisc_cmd = ELS_ADISC;
479 hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost));
480
481 ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els,
482 ZFCP_FC_CTELS_TMO);
483 if (ret)
484 kmem_cache_free(zfcp_fc_req_cache, fc_req);
485
486 return ret;
487 }
488
zfcp_fc_link_test_work(struct work_struct * work)489 void zfcp_fc_link_test_work(struct work_struct *work)
490 {
491 struct zfcp_port *port =
492 container_of(work, struct zfcp_port, test_link_work);
493 int retval;
494
495 get_device(&port->dev);
496 port->rport_task = RPORT_DEL;
497 zfcp_scsi_rport_work(&port->rport_work);
498
499 /* only issue one test command at one time per port */
500 if (atomic_read(&port->status) & ZFCP_STATUS_PORT_LINK_TEST)
501 goto out;
502
503 atomic_set_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
504
505 retval = zfcp_fc_adisc(port);
506 if (retval == 0)
507 return;
508
509 /* send of ADISC was not possible */
510 atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
511 zfcp_erp_port_forced_reopen(port, 0, "fcltwk1");
512
513 out:
514 put_device(&port->dev);
515 }
516
517 /**
518 * zfcp_fc_test_link - lightweight link test procedure
519 * @port: port to be tested
520 *
521 * Test status of a link to a remote port using the ELS command ADISC.
522 * If there is a problem with the remote port, error recovery steps
523 * will be triggered.
524 */
zfcp_fc_test_link(struct zfcp_port * port)525 void zfcp_fc_test_link(struct zfcp_port *port)
526 {
527 get_device(&port->dev);
528 if (!queue_work(port->adapter->work_queue, &port->test_link_work))
529 put_device(&port->dev);
530 }
531
zfcp_alloc_sg_env(int buf_num)532 static struct zfcp_fc_req *zfcp_alloc_sg_env(int buf_num)
533 {
534 struct zfcp_fc_req *fc_req;
535
536 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
537 if (!fc_req)
538 return NULL;
539
540 if (zfcp_sg_setup_table(&fc_req->sg_rsp, buf_num)) {
541 kmem_cache_free(zfcp_fc_req_cache, fc_req);
542 return NULL;
543 }
544
545 sg_init_one(&fc_req->sg_req, &fc_req->u.gpn_ft.req,
546 sizeof(struct zfcp_fc_gpn_ft_req));
547
548 return fc_req;
549 }
550
zfcp_fc_send_gpn_ft(struct zfcp_fc_req * fc_req,struct zfcp_adapter * adapter,int max_bytes)551 static int zfcp_fc_send_gpn_ft(struct zfcp_fc_req *fc_req,
552 struct zfcp_adapter *adapter, int max_bytes)
553 {
554 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
555 struct zfcp_fc_gpn_ft_req *req = &fc_req->u.gpn_ft.req;
556 DECLARE_COMPLETION_ONSTACK(completion);
557 int ret;
558
559 zfcp_fc_ct_ns_init(&req->ct_hdr, FC_NS_GPN_FT, max_bytes);
560 req->gpn_ft.fn_fc4_type = FC_TYPE_FCP;
561
562 ct_els->handler = zfcp_fc_complete;
563 ct_els->handler_data = &completion;
564 ct_els->req = &fc_req->sg_req;
565 ct_els->resp = &fc_req->sg_rsp;
566
567 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
568 ZFCP_FC_CTELS_TMO);
569 if (!ret)
570 wait_for_completion(&completion);
571 return ret;
572 }
573
zfcp_fc_validate_port(struct zfcp_port * port,struct list_head * lh)574 static void zfcp_fc_validate_port(struct zfcp_port *port, struct list_head *lh)
575 {
576 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC))
577 return;
578
579 atomic_clear_mask(ZFCP_STATUS_COMMON_NOESC, &port->status);
580
581 if ((port->supported_classes != 0) ||
582 !list_empty(&port->unit_list))
583 return;
584
585 list_move_tail(&port->list, lh);
586 }
587
zfcp_fc_eval_gpn_ft(struct zfcp_fc_req * fc_req,struct zfcp_adapter * adapter,int max_entries)588 static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,
589 struct zfcp_adapter *adapter, int max_entries)
590 {
591 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
592 struct scatterlist *sg = &fc_req->sg_rsp;
593 struct fc_ct_hdr *hdr = sg_virt(sg);
594 struct fc_gpn_ft_resp *acc = sg_virt(sg);
595 struct zfcp_port *port, *tmp;
596 unsigned long flags;
597 LIST_HEAD(remove_lh);
598 u32 d_id;
599 int ret = 0, x, last = 0;
600
601 if (ct_els->status)
602 return -EIO;
603
604 if (hdr->ct_cmd != FC_FS_ACC) {
605 if (hdr->ct_reason == FC_BA_RJT_UNABLE)
606 return -EAGAIN; /* might be a temporary condition */
607 return -EIO;
608 }
609
610 if (hdr->ct_mr_size) {
611 dev_warn(&adapter->ccw_device->dev,
612 "The name server reported %d words residual data\n",
613 hdr->ct_mr_size);
614 return -E2BIG;
615 }
616
617 /* first entry is the header */
618 for (x = 1; x < max_entries && !last; x++) {
619 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
620 acc++;
621 else
622 acc = sg_virt(++sg);
623
624 last = acc->fp_flags & FC_NS_FID_LAST;
625 d_id = ntoh24(acc->fp_fid);
626
627 /* don't attach ports with a well known address */
628 if (d_id >= FC_FID_WELL_KNOWN_BASE)
629 continue;
630 /* skip the adapter's port and known remote ports */
631 if (acc->fp_wwpn == fc_host_port_name(adapter->scsi_host))
632 continue;
633
634 port = zfcp_port_enqueue(adapter, acc->fp_wwpn,
635 ZFCP_STATUS_COMMON_NOESC, d_id);
636 if (!IS_ERR(port))
637 zfcp_erp_port_reopen(port, 0, "fcegpf1");
638 else if (PTR_ERR(port) != -EEXIST)
639 ret = PTR_ERR(port);
640 }
641
642 zfcp_erp_wait(adapter);
643 write_lock_irqsave(&adapter->port_list_lock, flags);
644 list_for_each_entry_safe(port, tmp, &adapter->port_list, list)
645 zfcp_fc_validate_port(port, &remove_lh);
646 write_unlock_irqrestore(&adapter->port_list_lock, flags);
647
648 list_for_each_entry_safe(port, tmp, &remove_lh, list) {
649 zfcp_erp_port_shutdown(port, 0, "fcegpf2");
650 zfcp_device_unregister(&port->dev, &zfcp_sysfs_port_attrs);
651 }
652
653 return ret;
654 }
655
656 /**
657 * zfcp_fc_scan_ports - scan remote ports and attach new ports
658 * @work: reference to scheduled work
659 */
zfcp_fc_scan_ports(struct work_struct * work)660 void zfcp_fc_scan_ports(struct work_struct *work)
661 {
662 struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
663 scan_work);
664 int ret, i;
665 struct zfcp_fc_req *fc_req;
666 int chain, max_entries, buf_num, max_bytes;
667
668 chain = adapter->adapter_features & FSF_FEATURE_ELS_CT_CHAINED_SBALS;
669 buf_num = chain ? ZFCP_FC_GPN_FT_NUM_BUFS : 1;
670 max_entries = chain ? ZFCP_FC_GPN_FT_MAX_ENT : ZFCP_FC_GPN_FT_ENT_PAGE;
671 max_bytes = chain ? ZFCP_FC_GPN_FT_MAX_SIZE : ZFCP_FC_CT_SIZE_PAGE;
672
673 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
674 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
675 return;
676
677 if (zfcp_fc_wka_port_get(&adapter->gs->ds))
678 return;
679
680 fc_req = zfcp_alloc_sg_env(buf_num);
681 if (!fc_req)
682 goto out;
683
684 for (i = 0; i < 3; i++) {
685 ret = zfcp_fc_send_gpn_ft(fc_req, adapter, max_bytes);
686 if (!ret) {
687 ret = zfcp_fc_eval_gpn_ft(fc_req, adapter, max_entries);
688 if (ret == -EAGAIN)
689 ssleep(1);
690 else
691 break;
692 }
693 }
694 zfcp_sg_free_table(&fc_req->sg_rsp, buf_num);
695 kmem_cache_free(zfcp_fc_req_cache, fc_req);
696 out:
697 zfcp_fc_wka_port_put(&adapter->gs->ds);
698 }
699
zfcp_fc_gspn(struct zfcp_adapter * adapter,struct zfcp_fc_req * fc_req)700 static int zfcp_fc_gspn(struct zfcp_adapter *adapter,
701 struct zfcp_fc_req *fc_req)
702 {
703 DECLARE_COMPLETION_ONSTACK(completion);
704 char devno[] = "DEVNO:";
705 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
706 struct zfcp_fc_gspn_req *gspn_req = &fc_req->u.gspn.req;
707 struct zfcp_fc_gspn_rsp *gspn_rsp = &fc_req->u.gspn.rsp;
708 int ret;
709
710 zfcp_fc_ct_ns_init(&gspn_req->ct_hdr, FC_NS_GSPN_ID,
711 FC_SYMBOLIC_NAME_SIZE);
712 hton24(gspn_req->gspn.fp_fid, fc_host_port_id(adapter->scsi_host));
713
714 sg_init_one(&fc_req->sg_req, gspn_req, sizeof(*gspn_req));
715 sg_init_one(&fc_req->sg_rsp, gspn_rsp, sizeof(*gspn_rsp));
716
717 ct_els->handler = zfcp_fc_complete;
718 ct_els->handler_data = &completion;
719 ct_els->req = &fc_req->sg_req;
720 ct_els->resp = &fc_req->sg_rsp;
721
722 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
723 ZFCP_FC_CTELS_TMO);
724 if (ret)
725 return ret;
726
727 wait_for_completion(&completion);
728 if (ct_els->status)
729 return ct_els->status;
730
731 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_NPIV &&
732 !(strstr(gspn_rsp->gspn.fp_name, devno)))
733 snprintf(fc_host_symbolic_name(adapter->scsi_host),
734 FC_SYMBOLIC_NAME_SIZE, "%s%s %s NAME: %s",
735 gspn_rsp->gspn.fp_name, devno,
736 dev_name(&adapter->ccw_device->dev),
737 init_utsname()->nodename);
738 else
739 strlcpy(fc_host_symbolic_name(adapter->scsi_host),
740 gspn_rsp->gspn.fp_name, FC_SYMBOLIC_NAME_SIZE);
741
742 return 0;
743 }
744
zfcp_fc_rspn(struct zfcp_adapter * adapter,struct zfcp_fc_req * fc_req)745 static void zfcp_fc_rspn(struct zfcp_adapter *adapter,
746 struct zfcp_fc_req *fc_req)
747 {
748 DECLARE_COMPLETION_ONSTACK(completion);
749 struct Scsi_Host *shost = adapter->scsi_host;
750 struct zfcp_fsf_ct_els *ct_els = &fc_req->ct_els;
751 struct zfcp_fc_rspn_req *rspn_req = &fc_req->u.rspn.req;
752 struct fc_ct_hdr *rspn_rsp = &fc_req->u.rspn.rsp;
753 int ret, len;
754
755 zfcp_fc_ct_ns_init(&rspn_req->ct_hdr, FC_NS_RSPN_ID,
756 FC_SYMBOLIC_NAME_SIZE);
757 hton24(rspn_req->rspn.fr_fid.fp_fid, fc_host_port_id(shost));
758 len = strlcpy(rspn_req->rspn.fr_name, fc_host_symbolic_name(shost),
759 FC_SYMBOLIC_NAME_SIZE);
760 rspn_req->rspn.fr_name_len = len;
761
762 sg_init_one(&fc_req->sg_req, rspn_req, sizeof(*rspn_req));
763 sg_init_one(&fc_req->sg_rsp, rspn_rsp, sizeof(*rspn_rsp));
764
765 ct_els->handler = zfcp_fc_complete;
766 ct_els->handler_data = &completion;
767 ct_els->req = &fc_req->sg_req;
768 ct_els->resp = &fc_req->sg_rsp;
769
770 ret = zfcp_fsf_send_ct(&adapter->gs->ds, ct_els, NULL,
771 ZFCP_FC_CTELS_TMO);
772 if (!ret)
773 wait_for_completion(&completion);
774 }
775
776 /**
777 * zfcp_fc_sym_name_update - Retrieve and update the symbolic port name
778 * @work: ns_up_work of the adapter where to update the symbolic port name
779 *
780 * Retrieve the current symbolic port name that may have been set by
781 * the hardware using the GSPN request and update the fc_host
782 * symbolic_name sysfs attribute. When running in NPIV mode (and hence
783 * the port name is unique for this system), update the symbolic port
784 * name to add Linux specific information and update the FC nameserver
785 * using the RSPN request.
786 */
zfcp_fc_sym_name_update(struct work_struct * work)787 void zfcp_fc_sym_name_update(struct work_struct *work)
788 {
789 struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter,
790 ns_up_work);
791 int ret;
792 struct zfcp_fc_req *fc_req;
793
794 if (fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPORT &&
795 fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
796 return;
797
798 fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_KERNEL);
799 if (!fc_req)
800 return;
801
802 ret = zfcp_fc_wka_port_get(&adapter->gs->ds);
803 if (ret)
804 goto out_free;
805
806 ret = zfcp_fc_gspn(adapter, fc_req);
807 if (ret || fc_host_port_type(adapter->scsi_host) != FC_PORTTYPE_NPIV)
808 goto out_ds_put;
809
810 memset(fc_req, 0, sizeof(*fc_req));
811 zfcp_fc_rspn(adapter, fc_req);
812
813 out_ds_put:
814 zfcp_fc_wka_port_put(&adapter->gs->ds);
815 out_free:
816 kmem_cache_free(zfcp_fc_req_cache, fc_req);
817 }
818
zfcp_fc_ct_els_job_handler(void * data)819 static void zfcp_fc_ct_els_job_handler(void *data)
820 {
821 struct fc_bsg_job *job = data;
822 struct zfcp_fsf_ct_els *zfcp_ct_els = job->dd_data;
823 struct fc_bsg_reply *jr = job->reply;
824
825 jr->reply_payload_rcv_len = job->reply_payload.payload_len;
826 jr->reply_data.ctels_reply.status = FC_CTELS_STATUS_OK;
827 jr->result = zfcp_ct_els->status ? -EIO : 0;
828 job->job_done(job);
829 }
830
zfcp_fc_job_wka_port(struct fc_bsg_job * job)831 static struct zfcp_fc_wka_port *zfcp_fc_job_wka_port(struct fc_bsg_job *job)
832 {
833 u32 preamble_word1;
834 u8 gs_type;
835 struct zfcp_adapter *adapter;
836
837 preamble_word1 = job->request->rqst_data.r_ct.preamble_word1;
838 gs_type = (preamble_word1 & 0xff000000) >> 24;
839
840 adapter = (struct zfcp_adapter *) job->shost->hostdata[0];
841
842 switch (gs_type) {
843 case FC_FST_ALIAS:
844 return &adapter->gs->as;
845 case FC_FST_MGMT:
846 return &adapter->gs->ms;
847 case FC_FST_TIME:
848 return &adapter->gs->ts;
849 break;
850 case FC_FST_DIR:
851 return &adapter->gs->ds;
852 break;
853 default:
854 return NULL;
855 }
856 }
857
zfcp_fc_ct_job_handler(void * data)858 static void zfcp_fc_ct_job_handler(void *data)
859 {
860 struct fc_bsg_job *job = data;
861 struct zfcp_fc_wka_port *wka_port;
862
863 wka_port = zfcp_fc_job_wka_port(job);
864 zfcp_fc_wka_port_put(wka_port);
865
866 zfcp_fc_ct_els_job_handler(data);
867 }
868
zfcp_fc_exec_els_job(struct fc_bsg_job * job,struct zfcp_adapter * adapter)869 static int zfcp_fc_exec_els_job(struct fc_bsg_job *job,
870 struct zfcp_adapter *adapter)
871 {
872 struct zfcp_fsf_ct_els *els = job->dd_data;
873 struct fc_rport *rport = job->rport;
874 struct zfcp_port *port;
875 u32 d_id;
876
877 if (rport) {
878 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
879 if (!port)
880 return -EINVAL;
881
882 d_id = port->d_id;
883 put_device(&port->dev);
884 } else
885 d_id = ntoh24(job->request->rqst_data.h_els.port_id);
886
887 els->handler = zfcp_fc_ct_els_job_handler;
888 return zfcp_fsf_send_els(adapter, d_id, els, job->req->timeout / HZ);
889 }
890
zfcp_fc_exec_ct_job(struct fc_bsg_job * job,struct zfcp_adapter * adapter)891 static int zfcp_fc_exec_ct_job(struct fc_bsg_job *job,
892 struct zfcp_adapter *adapter)
893 {
894 int ret;
895 struct zfcp_fsf_ct_els *ct = job->dd_data;
896 struct zfcp_fc_wka_port *wka_port;
897
898 wka_port = zfcp_fc_job_wka_port(job);
899 if (!wka_port)
900 return -EINVAL;
901
902 ret = zfcp_fc_wka_port_get(wka_port);
903 if (ret)
904 return ret;
905
906 ct->handler = zfcp_fc_ct_job_handler;
907 ret = zfcp_fsf_send_ct(wka_port, ct, NULL, job->req->timeout / HZ);
908 if (ret)
909 zfcp_fc_wka_port_put(wka_port);
910
911 return ret;
912 }
913
zfcp_fc_exec_bsg_job(struct fc_bsg_job * job)914 int zfcp_fc_exec_bsg_job(struct fc_bsg_job *job)
915 {
916 struct Scsi_Host *shost;
917 struct zfcp_adapter *adapter;
918 struct zfcp_fsf_ct_els *ct_els = job->dd_data;
919
920 shost = job->rport ? rport_to_shost(job->rport) : job->shost;
921 adapter = (struct zfcp_adapter *)shost->hostdata[0];
922
923 if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN))
924 return -EINVAL;
925
926 ct_els->req = job->request_payload.sg_list;
927 ct_els->resp = job->reply_payload.sg_list;
928 ct_els->handler_data = job;
929
930 switch (job->request->msgcode) {
931 case FC_BSG_RPT_ELS:
932 case FC_BSG_HST_ELS_NOLOGIN:
933 return zfcp_fc_exec_els_job(job, adapter);
934 case FC_BSG_RPT_CT:
935 case FC_BSG_HST_CT:
936 return zfcp_fc_exec_ct_job(job, adapter);
937 default:
938 return -EINVAL;
939 }
940 }
941
zfcp_fc_timeout_bsg_job(struct fc_bsg_job * job)942 int zfcp_fc_timeout_bsg_job(struct fc_bsg_job *job)
943 {
944 /* hardware tracks timeout, reset bsg timeout to not interfere */
945 return -EAGAIN;
946 }
947
zfcp_fc_gs_setup(struct zfcp_adapter * adapter)948 int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
949 {
950 struct zfcp_fc_wka_ports *wka_ports;
951
952 wka_ports = kzalloc(sizeof(struct zfcp_fc_wka_ports), GFP_KERNEL);
953 if (!wka_ports)
954 return -ENOMEM;
955
956 adapter->gs = wka_ports;
957 zfcp_fc_wka_port_init(&wka_ports->ms, FC_FID_MGMT_SERV, adapter);
958 zfcp_fc_wka_port_init(&wka_ports->ts, FC_FID_TIME_SERV, adapter);
959 zfcp_fc_wka_port_init(&wka_ports->ds, FC_FID_DIR_SERV, adapter);
960 zfcp_fc_wka_port_init(&wka_ports->as, FC_FID_ALIASES, adapter);
961
962 return 0;
963 }
964
zfcp_fc_gs_destroy(struct zfcp_adapter * adapter)965 void zfcp_fc_gs_destroy(struct zfcp_adapter *adapter)
966 {
967 kfree(adapter->gs);
968 adapter->gs = NULL;
969 }
970
971