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UBUNTU: Ubuntu-4.13.0-45.50
[mirror_ubuntu-artful-kernel.git] / drivers / scsi / scsi_transport_fc.c
1 /*
2 * FiberChannel transport specific attributes exported to sysfs.
3 *
4 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 * ========
21 *
22 * Copyright (C) 2004-2007 James Smart, Emulex Corporation
23 * Rewrite for host, target, device, and remote port attributes,
24 * statistics, and service functions...
25 * Add vports, etc
26 *
27 */
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/slab.h>
31 #include <linux/delay.h>
32 #include <linux/kernel.h>
33 #include <linux/bsg-lib.h>
34 #include <scsi/scsi_device.h>
35 #include <scsi/scsi_host.h>
36 #include <scsi/scsi_transport.h>
37 #include <scsi/scsi_transport_fc.h>
38 #include <scsi/scsi_cmnd.h>
39 #include <net/netlink.h>
40 #include <scsi/scsi_netlink_fc.h>
41 #include <scsi/scsi_bsg_fc.h>
42 #include "scsi_priv.h"
43
44 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
45 static void fc_vport_sched_delete(struct work_struct *work);
46 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
47 struct device *pdev, struct fc_vport_identifiers *ids,
48 struct fc_vport **vport);
49 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
50 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
51 static void fc_bsg_remove(struct request_queue *);
52 static void fc_bsg_goose_queue(struct fc_rport *);
53
54 /*
55 * Module Parameters
56 */
57
58 /*
59 * dev_loss_tmo: the default number of seconds that the FC transport
60 * should insulate the loss of a remote port.
61 * The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
62 */
63 static unsigned int fc_dev_loss_tmo = 60; /* seconds */
64
65 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
66 MODULE_PARM_DESC(dev_loss_tmo,
67 "Maximum number of seconds that the FC transport should"
68 " insulate the loss of a remote port. Once this value is"
69 " exceeded, the scsi target is removed. Value should be"
70 " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
71 " fast_io_fail_tmo is not set.");
72
73 /*
74 * Redefine so that we can have same named attributes in the
75 * sdev/starget/host objects.
76 */
77 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
78 struct device_attribute device_attr_##_prefix##_##_name = \
79 __ATTR(_name,_mode,_show,_store)
80
81 #define fc_enum_name_search(title, table_type, table) \
82 static const char *get_fc_##title##_name(enum table_type table_key) \
83 { \
84 int i; \
85 char *name = NULL; \
86 \
87 for (i = 0; i < ARRAY_SIZE(table); i++) { \
88 if (table[i].value == table_key) { \
89 name = table[i].name; \
90 break; \
91 } \
92 } \
93 return name; \
94 }
95
96 #define fc_enum_name_match(title, table_type, table) \
97 static int get_fc_##title##_match(const char *table_key, \
98 enum table_type *value) \
99 { \
100 int i; \
101 \
102 for (i = 0; i < ARRAY_SIZE(table); i++) { \
103 if (strncmp(table_key, table[i].name, \
104 table[i].matchlen) == 0) { \
105 *value = table[i].value; \
106 return 0; /* success */ \
107 } \
108 } \
109 return 1; /* failure */ \
110 }
111
112
113 /* Convert fc_port_type values to ascii string name */
114 static struct {
115 enum fc_port_type value;
116 char *name;
117 } fc_port_type_names[] = {
118 { FC_PORTTYPE_UNKNOWN, "Unknown" },
119 { FC_PORTTYPE_OTHER, "Other" },
120 { FC_PORTTYPE_NOTPRESENT, "Not Present" },
121 { FC_PORTTYPE_NPORT, "NPort (fabric via point-to-point)" },
122 { FC_PORTTYPE_NLPORT, "NLPort (fabric via loop)" },
123 { FC_PORTTYPE_LPORT, "LPort (private loop)" },
124 { FC_PORTTYPE_PTP, "Point-To-Point (direct nport connection)" },
125 { FC_PORTTYPE_NPIV, "NPIV VPORT" },
126 };
127 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
128 #define FC_PORTTYPE_MAX_NAMELEN 50
129
130 /* Reuse fc_port_type enum function for vport_type */
131 #define get_fc_vport_type_name get_fc_port_type_name
132
133
134 /* Convert fc_host_event_code values to ascii string name */
135 static const struct {
136 enum fc_host_event_code value;
137 char *name;
138 } fc_host_event_code_names[] = {
139 { FCH_EVT_LIP, "lip" },
140 { FCH_EVT_LINKUP, "link_up" },
141 { FCH_EVT_LINKDOWN, "link_down" },
142 { FCH_EVT_LIPRESET, "lip_reset" },
143 { FCH_EVT_RSCN, "rscn" },
144 { FCH_EVT_ADAPTER_CHANGE, "adapter_chg" },
145 { FCH_EVT_PORT_UNKNOWN, "port_unknown" },
146 { FCH_EVT_PORT_ONLINE, "port_online" },
147 { FCH_EVT_PORT_OFFLINE, "port_offline" },
148 { FCH_EVT_PORT_FABRIC, "port_fabric" },
149 { FCH_EVT_LINK_UNKNOWN, "link_unknown" },
150 { FCH_EVT_VENDOR_UNIQUE, "vendor_unique" },
151 };
152 fc_enum_name_search(host_event_code, fc_host_event_code,
153 fc_host_event_code_names)
154 #define FC_HOST_EVENT_CODE_MAX_NAMELEN 30
155
156
157 /* Convert fc_port_state values to ascii string name */
158 static struct {
159 enum fc_port_state value;
160 char *name;
161 } fc_port_state_names[] = {
162 { FC_PORTSTATE_UNKNOWN, "Unknown" },
163 { FC_PORTSTATE_NOTPRESENT, "Not Present" },
164 { FC_PORTSTATE_ONLINE, "Online" },
165 { FC_PORTSTATE_OFFLINE, "Offline" },
166 { FC_PORTSTATE_BLOCKED, "Blocked" },
167 { FC_PORTSTATE_BYPASSED, "Bypassed" },
168 { FC_PORTSTATE_DIAGNOSTICS, "Diagnostics" },
169 { FC_PORTSTATE_LINKDOWN, "Linkdown" },
170 { FC_PORTSTATE_ERROR, "Error" },
171 { FC_PORTSTATE_LOOPBACK, "Loopback" },
172 { FC_PORTSTATE_DELETED, "Deleted" },
173 };
174 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
175 #define FC_PORTSTATE_MAX_NAMELEN 20
176
177
178 /* Convert fc_vport_state values to ascii string name */
179 static struct {
180 enum fc_vport_state value;
181 char *name;
182 } fc_vport_state_names[] = {
183 { FC_VPORT_UNKNOWN, "Unknown" },
184 { FC_VPORT_ACTIVE, "Active" },
185 { FC_VPORT_DISABLED, "Disabled" },
186 { FC_VPORT_LINKDOWN, "Linkdown" },
187 { FC_VPORT_INITIALIZING, "Initializing" },
188 { FC_VPORT_NO_FABRIC_SUPP, "No Fabric Support" },
189 { FC_VPORT_NO_FABRIC_RSCS, "No Fabric Resources" },
190 { FC_VPORT_FABRIC_LOGOUT, "Fabric Logout" },
191 { FC_VPORT_FABRIC_REJ_WWN, "Fabric Rejected WWN" },
192 { FC_VPORT_FAILED, "VPort Failed" },
193 };
194 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
195 #define FC_VPORTSTATE_MAX_NAMELEN 24
196
197 /* Reuse fc_vport_state enum function for vport_last_state */
198 #define get_fc_vport_last_state_name get_fc_vport_state_name
199
200
201 /* Convert fc_tgtid_binding_type values to ascii string name */
202 static const struct {
203 enum fc_tgtid_binding_type value;
204 char *name;
205 int matchlen;
206 } fc_tgtid_binding_type_names[] = {
207 { FC_TGTID_BIND_NONE, "none", 4 },
208 { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
209 { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
210 { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
211 };
212 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
213 fc_tgtid_binding_type_names)
214 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
215 fc_tgtid_binding_type_names)
216 #define FC_BINDTYPE_MAX_NAMELEN 30
217
218
219 #define fc_bitfield_name_search(title, table) \
220 static ssize_t \
221 get_fc_##title##_names(u32 table_key, char *buf) \
222 { \
223 char *prefix = ""; \
224 ssize_t len = 0; \
225 int i; \
226 \
227 for (i = 0; i < ARRAY_SIZE(table); i++) { \
228 if (table[i].value & table_key) { \
229 len += sprintf(buf + len, "%s%s", \
230 prefix, table[i].name); \
231 prefix = ", "; \
232 } \
233 } \
234 len += sprintf(buf + len, "\n"); \
235 return len; \
236 }
237
238
239 /* Convert FC_COS bit values to ascii string name */
240 static const struct {
241 u32 value;
242 char *name;
243 } fc_cos_names[] = {
244 { FC_COS_CLASS1, "Class 1" },
245 { FC_COS_CLASS2, "Class 2" },
246 { FC_COS_CLASS3, "Class 3" },
247 { FC_COS_CLASS4, "Class 4" },
248 { FC_COS_CLASS6, "Class 6" },
249 };
250 fc_bitfield_name_search(cos, fc_cos_names)
251
252
253 /* Convert FC_PORTSPEED bit values to ascii string name */
254 static const struct {
255 u32 value;
256 char *name;
257 } fc_port_speed_names[] = {
258 { FC_PORTSPEED_1GBIT, "1 Gbit" },
259 { FC_PORTSPEED_2GBIT, "2 Gbit" },
260 { FC_PORTSPEED_4GBIT, "4 Gbit" },
261 { FC_PORTSPEED_10GBIT, "10 Gbit" },
262 { FC_PORTSPEED_8GBIT, "8 Gbit" },
263 { FC_PORTSPEED_16GBIT, "16 Gbit" },
264 { FC_PORTSPEED_32GBIT, "32 Gbit" },
265 { FC_PORTSPEED_20GBIT, "20 Gbit" },
266 { FC_PORTSPEED_40GBIT, "40 Gbit" },
267 { FC_PORTSPEED_50GBIT, "50 Gbit" },
268 { FC_PORTSPEED_100GBIT, "100 Gbit" },
269 { FC_PORTSPEED_25GBIT, "25 Gbit" },
270 { FC_PORTSPEED_NOT_NEGOTIATED, "Not Negotiated" },
271 };
272 fc_bitfield_name_search(port_speed, fc_port_speed_names)
273
274
275 static int
276 show_fc_fc4s (char *buf, u8 *fc4_list)
277 {
278 int i, len=0;
279
280 for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
281 len += sprintf(buf + len , "0x%02x ", *fc4_list);
282 len += sprintf(buf + len, "\n");
283 return len;
284 }
285
286
287 /* Convert FC_PORT_ROLE bit values to ascii string name */
288 static const struct {
289 u32 value;
290 char *name;
291 } fc_port_role_names[] = {
292 { FC_PORT_ROLE_FCP_TARGET, "FCP Target" },
293 { FC_PORT_ROLE_FCP_INITIATOR, "FCP Initiator" },
294 { FC_PORT_ROLE_IP_PORT, "IP Port" },
295 { FC_PORT_ROLE_FCP_DUMMY_INITIATOR, "FCP Dummy Initiator" },
296 };
297 fc_bitfield_name_search(port_roles, fc_port_role_names)
298
299 /*
300 * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
301 */
302 #define FC_WELLKNOWN_PORTID_MASK 0xfffff0
303 #define FC_WELLKNOWN_ROLE_MASK 0x00000f
304 #define FC_FPORT_PORTID 0x00000e
305 #define FC_FABCTLR_PORTID 0x00000d
306 #define FC_DIRSRVR_PORTID 0x00000c
307 #define FC_TIMESRVR_PORTID 0x00000b
308 #define FC_MGMTSRVR_PORTID 0x00000a
309
310
311 static void fc_timeout_deleted_rport(struct work_struct *work);
312 static void fc_timeout_fail_rport_io(struct work_struct *work);
313 static void fc_scsi_scan_rport(struct work_struct *work);
314
315 /*
316 * Attribute counts pre object type...
317 * Increase these values if you add attributes
318 */
319 #define FC_STARGET_NUM_ATTRS 3
320 #define FC_RPORT_NUM_ATTRS 10
321 #define FC_VPORT_NUM_ATTRS 9
322 #define FC_HOST_NUM_ATTRS 29
323
324 struct fc_internal {
325 struct scsi_transport_template t;
326 struct fc_function_template *f;
327
328 /*
329 * For attributes : each object has :
330 * An array of the actual attributes structures
331 * An array of null-terminated pointers to the attribute
332 * structures - used for mid-layer interaction.
333 *
334 * The attribute containers for the starget and host are are
335 * part of the midlayer. As the remote port is specific to the
336 * fc transport, we must provide the attribute container.
337 */
338 struct device_attribute private_starget_attrs[
339 FC_STARGET_NUM_ATTRS];
340 struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
341
342 struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
343 struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
344
345 struct transport_container rport_attr_cont;
346 struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
347 struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
348
349 struct transport_container vport_attr_cont;
350 struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
351 struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
352 };
353
354 #define to_fc_internal(tmpl) container_of(tmpl, struct fc_internal, t)
355
356 static int fc_target_setup(struct transport_container *tc, struct device *dev,
357 struct device *cdev)
358 {
359 struct scsi_target *starget = to_scsi_target(dev);
360 struct fc_rport *rport = starget_to_rport(starget);
361
362 /*
363 * if parent is remote port, use values from remote port.
364 * Otherwise, this host uses the fc_transport, but not the
365 * remote port interface. As such, initialize to known non-values.
366 */
367 if (rport) {
368 fc_starget_node_name(starget) = rport->node_name;
369 fc_starget_port_name(starget) = rport->port_name;
370 fc_starget_port_id(starget) = rport->port_id;
371 } else {
372 fc_starget_node_name(starget) = -1;
373 fc_starget_port_name(starget) = -1;
374 fc_starget_port_id(starget) = -1;
375 }
376
377 return 0;
378 }
379
380 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
381 "fc_transport",
382 fc_target_setup,
383 NULL,
384 NULL);
385
386 static int fc_host_setup(struct transport_container *tc, struct device *dev,
387 struct device *cdev)
388 {
389 struct Scsi_Host *shost = dev_to_shost(dev);
390 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
391
392 /*
393 * Set default values easily detected by the midlayer as
394 * failure cases. The scsi lldd is responsible for initializing
395 * all transport attributes to valid values per host.
396 */
397 fc_host->node_name = -1;
398 fc_host->port_name = -1;
399 fc_host->permanent_port_name = -1;
400 fc_host->supported_classes = FC_COS_UNSPECIFIED;
401 memset(fc_host->supported_fc4s, 0,
402 sizeof(fc_host->supported_fc4s));
403 fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
404 fc_host->maxframe_size = -1;
405 fc_host->max_npiv_vports = 0;
406 memset(fc_host->serial_number, 0,
407 sizeof(fc_host->serial_number));
408 memset(fc_host->manufacturer, 0,
409 sizeof(fc_host->manufacturer));
410 memset(fc_host->model, 0,
411 sizeof(fc_host->model));
412 memset(fc_host->model_description, 0,
413 sizeof(fc_host->model_description));
414 memset(fc_host->hardware_version, 0,
415 sizeof(fc_host->hardware_version));
416 memset(fc_host->driver_version, 0,
417 sizeof(fc_host->driver_version));
418 memset(fc_host->firmware_version, 0,
419 sizeof(fc_host->firmware_version));
420 memset(fc_host->optionrom_version, 0,
421 sizeof(fc_host->optionrom_version));
422
423 fc_host->port_id = -1;
424 fc_host->port_type = FC_PORTTYPE_UNKNOWN;
425 fc_host->port_state = FC_PORTSTATE_UNKNOWN;
426 memset(fc_host->active_fc4s, 0,
427 sizeof(fc_host->active_fc4s));
428 fc_host->speed = FC_PORTSPEED_UNKNOWN;
429 fc_host->fabric_name = -1;
430 memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
431 memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
432
433 fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
434
435 INIT_LIST_HEAD(&fc_host->rports);
436 INIT_LIST_HEAD(&fc_host->rport_bindings);
437 INIT_LIST_HEAD(&fc_host->vports);
438 fc_host->next_rport_number = 0;
439 fc_host->next_target_id = 0;
440 fc_host->next_vport_number = 0;
441 fc_host->npiv_vports_inuse = 0;
442
443 snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
444 "fc_wq_%d", shost->host_no);
445 fc_host->work_q = alloc_workqueue("%s", 0, 0, fc_host->work_q_name);
446 if (!fc_host->work_q)
447 return -ENOMEM;
448
449 fc_host->dev_loss_tmo = fc_dev_loss_tmo;
450 snprintf(fc_host->devloss_work_q_name,
451 sizeof(fc_host->devloss_work_q_name),
452 "fc_dl_%d", shost->host_no);
453 fc_host->devloss_work_q = alloc_workqueue("%s", 0, 0,
454 fc_host->devloss_work_q_name);
455 if (!fc_host->devloss_work_q) {
456 destroy_workqueue(fc_host->work_q);
457 fc_host->work_q = NULL;
458 return -ENOMEM;
459 }
460
461 fc_bsg_hostadd(shost, fc_host);
462 /* ignore any bsg add error - we just can't do sgio */
463
464 return 0;
465 }
466
467 static int fc_host_remove(struct transport_container *tc, struct device *dev,
468 struct device *cdev)
469 {
470 struct Scsi_Host *shost = dev_to_shost(dev);
471 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
472
473 fc_bsg_remove(fc_host->rqst_q);
474 return 0;
475 }
476
477 static DECLARE_TRANSPORT_CLASS(fc_host_class,
478 "fc_host",
479 fc_host_setup,
480 fc_host_remove,
481 NULL);
482
483 /*
484 * Setup and Remove actions for remote ports are handled
485 * in the service functions below.
486 */
487 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
488 "fc_remote_ports",
489 NULL,
490 NULL,
491 NULL);
492
493 /*
494 * Setup and Remove actions for virtual ports are handled
495 * in the service functions below.
496 */
497 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
498 "fc_vports",
499 NULL,
500 NULL,
501 NULL);
502
503 /*
504 * Netlink Infrastructure
505 */
506
507 static atomic_t fc_event_seq;
508
509 /**
510 * fc_get_event_number - Obtain the next sequential FC event number
511 *
512 * Notes:
513 * We could have inlined this, but it would have required fc_event_seq to
514 * be exposed. For now, live with the subroutine call.
515 * Atomic used to avoid lock/unlock...
516 */
517 u32
518 fc_get_event_number(void)
519 {
520 return atomic_add_return(1, &fc_event_seq);
521 }
522 EXPORT_SYMBOL(fc_get_event_number);
523
524
525 /**
526 * fc_host_post_event - called to post an even on an fc_host.
527 * @shost: host the event occurred on
528 * @event_number: fc event number obtained from get_fc_event_number()
529 * @event_code: fc_host event being posted
530 * @event_data: 32bits of data for the event being posted
531 *
532 * Notes:
533 * This routine assumes no locks are held on entry.
534 */
535 void
536 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
537 enum fc_host_event_code event_code, u32 event_data)
538 {
539 struct sk_buff *skb;
540 struct nlmsghdr *nlh;
541 struct fc_nl_event *event;
542 const char *name;
543 u32 len;
544 int err;
545
546 if (!scsi_nl_sock) {
547 err = -ENOENT;
548 goto send_fail;
549 }
550
551 len = FC_NL_MSGALIGN(sizeof(*event));
552
553 skb = nlmsg_new(len, GFP_KERNEL);
554 if (!skb) {
555 err = -ENOBUFS;
556 goto send_fail;
557 }
558
559 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
560 if (!nlh) {
561 err = -ENOBUFS;
562 goto send_fail_skb;
563 }
564 event = nlmsg_data(nlh);
565
566 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
567 FC_NL_ASYNC_EVENT, len);
568 event->seconds = get_seconds();
569 event->vendor_id = 0;
570 event->host_no = shost->host_no;
571 event->event_datalen = sizeof(u32); /* bytes */
572 event->event_num = event_number;
573 event->event_code = event_code;
574 event->event_data = event_data;
575
576 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
577 GFP_KERNEL);
578 return;
579
580 send_fail_skb:
581 kfree_skb(skb);
582 send_fail:
583 name = get_fc_host_event_code_name(event_code);
584 printk(KERN_WARNING
585 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
586 __func__, shost->host_no,
587 (name) ? name : "<unknown>", event_data, err);
588 return;
589 }
590 EXPORT_SYMBOL(fc_host_post_event);
591
592
593 /**
594 * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
595 * @shost: host the event occurred on
596 * @event_number: fc event number obtained from get_fc_event_number()
597 * @data_len: amount, in bytes, of vendor unique data
598 * @data_buf: pointer to vendor unique data
599 * @vendor_id: Vendor id
600 *
601 * Notes:
602 * This routine assumes no locks are held on entry.
603 */
604 void
605 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
606 u32 data_len, char * data_buf, u64 vendor_id)
607 {
608 struct sk_buff *skb;
609 struct nlmsghdr *nlh;
610 struct fc_nl_event *event;
611 u32 len;
612 int err;
613
614 if (!scsi_nl_sock) {
615 err = -ENOENT;
616 goto send_vendor_fail;
617 }
618
619 len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
620
621 skb = nlmsg_new(len, GFP_KERNEL);
622 if (!skb) {
623 err = -ENOBUFS;
624 goto send_vendor_fail;
625 }
626
627 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
628 if (!nlh) {
629 err = -ENOBUFS;
630 goto send_vendor_fail_skb;
631 }
632 event = nlmsg_data(nlh);
633
634 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
635 FC_NL_ASYNC_EVENT, len);
636 event->seconds = get_seconds();
637 event->vendor_id = vendor_id;
638 event->host_no = shost->host_no;
639 event->event_datalen = data_len; /* bytes */
640 event->event_num = event_number;
641 event->event_code = FCH_EVT_VENDOR_UNIQUE;
642 memcpy(&event->event_data, data_buf, data_len);
643
644 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
645 GFP_KERNEL);
646 return;
647
648 send_vendor_fail_skb:
649 kfree_skb(skb);
650 send_vendor_fail:
651 printk(KERN_WARNING
652 "%s: Dropped Event : host %d vendor_unique - err %d\n",
653 __func__, shost->host_no, err);
654 return;
655 }
656 EXPORT_SYMBOL(fc_host_post_vendor_event);
657
658
659
660 static __init int fc_transport_init(void)
661 {
662 int error;
663
664 atomic_set(&fc_event_seq, 0);
665
666 error = transport_class_register(&fc_host_class);
667 if (error)
668 return error;
669 error = transport_class_register(&fc_vport_class);
670 if (error)
671 goto unreg_host_class;
672 error = transport_class_register(&fc_rport_class);
673 if (error)
674 goto unreg_vport_class;
675 error = transport_class_register(&fc_transport_class);
676 if (error)
677 goto unreg_rport_class;
678 return 0;
679
680 unreg_rport_class:
681 transport_class_unregister(&fc_rport_class);
682 unreg_vport_class:
683 transport_class_unregister(&fc_vport_class);
684 unreg_host_class:
685 transport_class_unregister(&fc_host_class);
686 return error;
687 }
688
689 static void __exit fc_transport_exit(void)
690 {
691 transport_class_unregister(&fc_transport_class);
692 transport_class_unregister(&fc_rport_class);
693 transport_class_unregister(&fc_host_class);
694 transport_class_unregister(&fc_vport_class);
695 }
696
697 /*
698 * FC Remote Port Attribute Management
699 */
700
701 #define fc_rport_show_function(field, format_string, sz, cast) \
702 static ssize_t \
703 show_fc_rport_##field (struct device *dev, \
704 struct device_attribute *attr, char *buf) \
705 { \
706 struct fc_rport *rport = transport_class_to_rport(dev); \
707 struct Scsi_Host *shost = rport_to_shost(rport); \
708 struct fc_internal *i = to_fc_internal(shost->transportt); \
709 if ((i->f->get_rport_##field) && \
710 !((rport->port_state == FC_PORTSTATE_BLOCKED) || \
711 (rport->port_state == FC_PORTSTATE_DELETED) || \
712 (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
713 i->f->get_rport_##field(rport); \
714 return snprintf(buf, sz, format_string, cast rport->field); \
715 }
716
717 #define fc_rport_store_function(field) \
718 static ssize_t \
719 store_fc_rport_##field(struct device *dev, \
720 struct device_attribute *attr, \
721 const char *buf, size_t count) \
722 { \
723 int val; \
724 struct fc_rport *rport = transport_class_to_rport(dev); \
725 struct Scsi_Host *shost = rport_to_shost(rport); \
726 struct fc_internal *i = to_fc_internal(shost->transportt); \
727 char *cp; \
728 if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
729 (rport->port_state == FC_PORTSTATE_DELETED) || \
730 (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
731 return -EBUSY; \
732 val = simple_strtoul(buf, &cp, 0); \
733 if (*cp && (*cp != '\n')) \
734 return -EINVAL; \
735 i->f->set_rport_##field(rport, val); \
736 return count; \
737 }
738
739 #define fc_rport_rd_attr(field, format_string, sz) \
740 fc_rport_show_function(field, format_string, sz, ) \
741 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
742 show_fc_rport_##field, NULL)
743
744 #define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
745 fc_rport_show_function(field, format_string, sz, (cast)) \
746 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
747 show_fc_rport_##field, NULL)
748
749 #define fc_rport_rw_attr(field, format_string, sz) \
750 fc_rport_show_function(field, format_string, sz, ) \
751 fc_rport_store_function(field) \
752 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
753 show_fc_rport_##field, \
754 store_fc_rport_##field)
755
756
757 #define fc_private_rport_show_function(field, format_string, sz, cast) \
758 static ssize_t \
759 show_fc_rport_##field (struct device *dev, \
760 struct device_attribute *attr, char *buf) \
761 { \
762 struct fc_rport *rport = transport_class_to_rport(dev); \
763 return snprintf(buf, sz, format_string, cast rport->field); \
764 }
765
766 #define fc_private_rport_rd_attr(field, format_string, sz) \
767 fc_private_rport_show_function(field, format_string, sz, ) \
768 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
769 show_fc_rport_##field, NULL)
770
771 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
772 fc_private_rport_show_function(field, format_string, sz, (cast)) \
773 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
774 show_fc_rport_##field, NULL)
775
776
777 #define fc_private_rport_rd_enum_attr(title, maxlen) \
778 static ssize_t \
779 show_fc_rport_##title (struct device *dev, \
780 struct device_attribute *attr, char *buf) \
781 { \
782 struct fc_rport *rport = transport_class_to_rport(dev); \
783 const char *name; \
784 name = get_fc_##title##_name(rport->title); \
785 if (!name) \
786 return -EINVAL; \
787 return snprintf(buf, maxlen, "%s\n", name); \
788 } \
789 static FC_DEVICE_ATTR(rport, title, S_IRUGO, \
790 show_fc_rport_##title, NULL)
791
792
793 #define SETUP_RPORT_ATTRIBUTE_RD(field) \
794 i->private_rport_attrs[count] = device_attr_rport_##field; \
795 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
796 i->private_rport_attrs[count].store = NULL; \
797 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
798 if (i->f->show_rport_##field) \
799 count++
800
801 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
802 i->private_rport_attrs[count] = device_attr_rport_##field; \
803 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
804 i->private_rport_attrs[count].store = NULL; \
805 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
806 count++
807
808 #define SETUP_RPORT_ATTRIBUTE_RW(field) \
809 i->private_rport_attrs[count] = device_attr_rport_##field; \
810 if (!i->f->set_rport_##field) { \
811 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
812 i->private_rport_attrs[count].store = NULL; \
813 } \
814 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
815 if (i->f->show_rport_##field) \
816 count++
817
818 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
819 { \
820 i->private_rport_attrs[count] = device_attr_rport_##field; \
821 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
822 count++; \
823 }
824
825
826 /* The FC Transport Remote Port Attributes: */
827
828 /* Fixed Remote Port Attributes */
829
830 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
831
832 static ssize_t
833 show_fc_rport_supported_classes (struct device *dev,
834 struct device_attribute *attr, char *buf)
835 {
836 struct fc_rport *rport = transport_class_to_rport(dev);
837 if (rport->supported_classes == FC_COS_UNSPECIFIED)
838 return snprintf(buf, 20, "unspecified\n");
839 return get_fc_cos_names(rport->supported_classes, buf);
840 }
841 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
842 show_fc_rport_supported_classes, NULL);
843
844 /* Dynamic Remote Port Attributes */
845
846 /*
847 * dev_loss_tmo attribute
848 */
849 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
850 {
851 char *cp;
852
853 *val = simple_strtoul(buf, &cp, 0);
854 if (*cp && (*cp != '\n'))
855 return -EINVAL;
856 /*
857 * Check for overflow; dev_loss_tmo is u32
858 */
859 if (*val > UINT_MAX)
860 return -EINVAL;
861
862 return 0;
863 }
864
865 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
866 unsigned long val)
867 {
868 struct Scsi_Host *shost = rport_to_shost(rport);
869 struct fc_internal *i = to_fc_internal(shost->transportt);
870
871 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
872 (rport->port_state == FC_PORTSTATE_DELETED) ||
873 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
874 return -EBUSY;
875 /*
876 * Check for overflow; dev_loss_tmo is u32
877 */
878 if (val > UINT_MAX)
879 return -EINVAL;
880
881 /*
882 * If fast_io_fail is off we have to cap
883 * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
884 */
885 if (rport->fast_io_fail_tmo == -1 &&
886 val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
887 return -EINVAL;
888
889 i->f->set_rport_dev_loss_tmo(rport, val);
890 return 0;
891 }
892
893 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
894 static ssize_t
895 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
896 const char *buf, size_t count)
897 {
898 struct fc_rport *rport = transport_class_to_rport(dev);
899 unsigned long val;
900 int rc;
901
902 rc = fc_str_to_dev_loss(buf, &val);
903 if (rc)
904 return rc;
905
906 rc = fc_rport_set_dev_loss_tmo(rport, val);
907 if (rc)
908 return rc;
909 return count;
910 }
911 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
912 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
913
914
915 /* Private Remote Port Attributes */
916
917 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
918 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
919 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
920
921 static ssize_t
922 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
923 char *buf)
924 {
925 struct fc_rport *rport = transport_class_to_rport(dev);
926
927 /* identify any roles that are port_id specific */
928 if ((rport->port_id != -1) &&
929 (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
930 FC_WELLKNOWN_PORTID_MASK) {
931 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
932 case FC_FPORT_PORTID:
933 return snprintf(buf, 30, "Fabric Port\n");
934 case FC_FABCTLR_PORTID:
935 return snprintf(buf, 30, "Fabric Controller\n");
936 case FC_DIRSRVR_PORTID:
937 return snprintf(buf, 30, "Directory Server\n");
938 case FC_TIMESRVR_PORTID:
939 return snprintf(buf, 30, "Time Server\n");
940 case FC_MGMTSRVR_PORTID:
941 return snprintf(buf, 30, "Management Server\n");
942 default:
943 return snprintf(buf, 30, "Unknown Fabric Entity\n");
944 }
945 } else {
946 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
947 return snprintf(buf, 20, "unknown\n");
948 return get_fc_port_roles_names(rport->roles, buf);
949 }
950 }
951 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
952 show_fc_rport_roles, NULL);
953
954 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
955 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
956
957 /*
958 * fast_io_fail_tmo attribute
959 */
960 static ssize_t
961 show_fc_rport_fast_io_fail_tmo (struct device *dev,
962 struct device_attribute *attr, char *buf)
963 {
964 struct fc_rport *rport = transport_class_to_rport(dev);
965
966 if (rport->fast_io_fail_tmo == -1)
967 return snprintf(buf, 5, "off\n");
968 return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
969 }
970
971 static ssize_t
972 store_fc_rport_fast_io_fail_tmo(struct device *dev,
973 struct device_attribute *attr, const char *buf,
974 size_t count)
975 {
976 int val;
977 char *cp;
978 struct fc_rport *rport = transport_class_to_rport(dev);
979
980 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
981 (rport->port_state == FC_PORTSTATE_DELETED) ||
982 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
983 return -EBUSY;
984 if (strncmp(buf, "off", 3) == 0)
985 rport->fast_io_fail_tmo = -1;
986 else {
987 val = simple_strtoul(buf, &cp, 0);
988 if ((*cp && (*cp != '\n')) || (val < 0))
989 return -EINVAL;
990 /*
991 * Cap fast_io_fail by dev_loss_tmo or
992 * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
993 */
994 if ((val >= rport->dev_loss_tmo) ||
995 (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
996 return -EINVAL;
997
998 rport->fast_io_fail_tmo = val;
999 }
1000 return count;
1001 }
1002 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
1003 show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
1004
1005
1006 /*
1007 * FC SCSI Target Attribute Management
1008 */
1009
1010 /*
1011 * Note: in the target show function we recognize when the remote
1012 * port is in the hierarchy and do not allow the driver to get
1013 * involved in sysfs functions. The driver only gets involved if
1014 * it's the "old" style that doesn't use rports.
1015 */
1016 #define fc_starget_show_function(field, format_string, sz, cast) \
1017 static ssize_t \
1018 show_fc_starget_##field (struct device *dev, \
1019 struct device_attribute *attr, char *buf) \
1020 { \
1021 struct scsi_target *starget = transport_class_to_starget(dev); \
1022 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
1023 struct fc_internal *i = to_fc_internal(shost->transportt); \
1024 struct fc_rport *rport = starget_to_rport(starget); \
1025 if (rport) \
1026 fc_starget_##field(starget) = rport->field; \
1027 else if (i->f->get_starget_##field) \
1028 i->f->get_starget_##field(starget); \
1029 return snprintf(buf, sz, format_string, \
1030 cast fc_starget_##field(starget)); \
1031 }
1032
1033 #define fc_starget_rd_attr(field, format_string, sz) \
1034 fc_starget_show_function(field, format_string, sz, ) \
1035 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1036 show_fc_starget_##field, NULL)
1037
1038 #define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
1039 fc_starget_show_function(field, format_string, sz, (cast)) \
1040 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1041 show_fc_starget_##field, NULL)
1042
1043 #define SETUP_STARGET_ATTRIBUTE_RD(field) \
1044 i->private_starget_attrs[count] = device_attr_starget_##field; \
1045 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1046 i->private_starget_attrs[count].store = NULL; \
1047 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1048 if (i->f->show_starget_##field) \
1049 count++
1050
1051 #define SETUP_STARGET_ATTRIBUTE_RW(field) \
1052 i->private_starget_attrs[count] = device_attr_starget_##field; \
1053 if (!i->f->set_starget_##field) { \
1054 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1055 i->private_starget_attrs[count].store = NULL; \
1056 } \
1057 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1058 if (i->f->show_starget_##field) \
1059 count++
1060
1061 /* The FC Transport SCSI Target Attributes: */
1062 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1063 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1064 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1065
1066
1067 /*
1068 * FC Virtual Port Attribute Management
1069 */
1070
1071 #define fc_vport_show_function(field, format_string, sz, cast) \
1072 static ssize_t \
1073 show_fc_vport_##field (struct device *dev, \
1074 struct device_attribute *attr, char *buf) \
1075 { \
1076 struct fc_vport *vport = transport_class_to_vport(dev); \
1077 struct Scsi_Host *shost = vport_to_shost(vport); \
1078 struct fc_internal *i = to_fc_internal(shost->transportt); \
1079 if ((i->f->get_vport_##field) && \
1080 !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))) \
1081 i->f->get_vport_##field(vport); \
1082 return snprintf(buf, sz, format_string, cast vport->field); \
1083 }
1084
1085 #define fc_vport_store_function(field) \
1086 static ssize_t \
1087 store_fc_vport_##field(struct device *dev, \
1088 struct device_attribute *attr, \
1089 const char *buf, size_t count) \
1090 { \
1091 int val; \
1092 struct fc_vport *vport = transport_class_to_vport(dev); \
1093 struct Scsi_Host *shost = vport_to_shost(vport); \
1094 struct fc_internal *i = to_fc_internal(shost->transportt); \
1095 char *cp; \
1096 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1097 return -EBUSY; \
1098 val = simple_strtoul(buf, &cp, 0); \
1099 if (*cp && (*cp != '\n')) \
1100 return -EINVAL; \
1101 i->f->set_vport_##field(vport, val); \
1102 return count; \
1103 }
1104
1105 #define fc_vport_store_str_function(field, slen) \
1106 static ssize_t \
1107 store_fc_vport_##field(struct device *dev, \
1108 struct device_attribute *attr, \
1109 const char *buf, size_t count) \
1110 { \
1111 struct fc_vport *vport = transport_class_to_vport(dev); \
1112 struct Scsi_Host *shost = vport_to_shost(vport); \
1113 struct fc_internal *i = to_fc_internal(shost->transportt); \
1114 unsigned int cnt=count; \
1115 \
1116 /* count may include a LF at end of string */ \
1117 if (buf[cnt-1] == '\n') \
1118 cnt--; \
1119 if (cnt > ((slen) - 1)) \
1120 return -EINVAL; \
1121 memcpy(vport->field, buf, cnt); \
1122 i->f->set_vport_##field(vport); \
1123 return count; \
1124 }
1125
1126 #define fc_vport_rd_attr(field, format_string, sz) \
1127 fc_vport_show_function(field, format_string, sz, ) \
1128 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1129 show_fc_vport_##field, NULL)
1130
1131 #define fc_vport_rd_attr_cast(field, format_string, sz, cast) \
1132 fc_vport_show_function(field, format_string, sz, (cast)) \
1133 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1134 show_fc_vport_##field, NULL)
1135
1136 #define fc_vport_rw_attr(field, format_string, sz) \
1137 fc_vport_show_function(field, format_string, sz, ) \
1138 fc_vport_store_function(field) \
1139 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1140 show_fc_vport_##field, \
1141 store_fc_vport_##field)
1142
1143 #define fc_private_vport_show_function(field, format_string, sz, cast) \
1144 static ssize_t \
1145 show_fc_vport_##field (struct device *dev, \
1146 struct device_attribute *attr, char *buf) \
1147 { \
1148 struct fc_vport *vport = transport_class_to_vport(dev); \
1149 return snprintf(buf, sz, format_string, cast vport->field); \
1150 }
1151
1152 #define fc_private_vport_store_u32_function(field) \
1153 static ssize_t \
1154 store_fc_vport_##field(struct device *dev, \
1155 struct device_attribute *attr, \
1156 const char *buf, size_t count) \
1157 { \
1158 u32 val; \
1159 struct fc_vport *vport = transport_class_to_vport(dev); \
1160 char *cp; \
1161 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1162 return -EBUSY; \
1163 val = simple_strtoul(buf, &cp, 0); \
1164 if (*cp && (*cp != '\n')) \
1165 return -EINVAL; \
1166 vport->field = val; \
1167 return count; \
1168 }
1169
1170
1171 #define fc_private_vport_rd_attr(field, format_string, sz) \
1172 fc_private_vport_show_function(field, format_string, sz, ) \
1173 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1174 show_fc_vport_##field, NULL)
1175
1176 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast) \
1177 fc_private_vport_show_function(field, format_string, sz, (cast)) \
1178 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1179 show_fc_vport_##field, NULL)
1180
1181 #define fc_private_vport_rw_u32_attr(field, format_string, sz) \
1182 fc_private_vport_show_function(field, format_string, sz, ) \
1183 fc_private_vport_store_u32_function(field) \
1184 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1185 show_fc_vport_##field, \
1186 store_fc_vport_##field)
1187
1188
1189 #define fc_private_vport_rd_enum_attr(title, maxlen) \
1190 static ssize_t \
1191 show_fc_vport_##title (struct device *dev, \
1192 struct device_attribute *attr, \
1193 char *buf) \
1194 { \
1195 struct fc_vport *vport = transport_class_to_vport(dev); \
1196 const char *name; \
1197 name = get_fc_##title##_name(vport->title); \
1198 if (!name) \
1199 return -EINVAL; \
1200 return snprintf(buf, maxlen, "%s\n", name); \
1201 } \
1202 static FC_DEVICE_ATTR(vport, title, S_IRUGO, \
1203 show_fc_vport_##title, NULL)
1204
1205
1206 #define SETUP_VPORT_ATTRIBUTE_RD(field) \
1207 i->private_vport_attrs[count] = device_attr_vport_##field; \
1208 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1209 i->private_vport_attrs[count].store = NULL; \
1210 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1211 if (i->f->get_##field) \
1212 count++
1213 /* NOTE: Above MACRO differs: checks function not show bit */
1214
1215 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field) \
1216 i->private_vport_attrs[count] = device_attr_vport_##field; \
1217 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1218 i->private_vport_attrs[count].store = NULL; \
1219 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1220 count++
1221
1222 #define SETUP_VPORT_ATTRIBUTE_WR(field) \
1223 i->private_vport_attrs[count] = device_attr_vport_##field; \
1224 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1225 if (i->f->field) \
1226 count++
1227 /* NOTE: Above MACRO differs: checks function */
1228
1229 #define SETUP_VPORT_ATTRIBUTE_RW(field) \
1230 i->private_vport_attrs[count] = device_attr_vport_##field; \
1231 if (!i->f->set_vport_##field) { \
1232 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1233 i->private_vport_attrs[count].store = NULL; \
1234 } \
1235 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1236 count++
1237 /* NOTE: Above MACRO differs: does not check show bit */
1238
1239 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field) \
1240 { \
1241 i->private_vport_attrs[count] = device_attr_vport_##field; \
1242 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1243 count++; \
1244 }
1245
1246
1247 /* The FC Transport Virtual Port Attributes: */
1248
1249 /* Fixed Virtual Port Attributes */
1250
1251 /* Dynamic Virtual Port Attributes */
1252
1253 /* Private Virtual Port Attributes */
1254
1255 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1256 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1257 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1258 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1259
1260 static ssize_t
1261 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1262 char *buf)
1263 {
1264 struct fc_vport *vport = transport_class_to_vport(dev);
1265
1266 if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1267 return snprintf(buf, 20, "unknown\n");
1268 return get_fc_port_roles_names(vport->roles, buf);
1269 }
1270 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1271
1272 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1273
1274 fc_private_vport_show_function(symbolic_name, "%s\n",
1275 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1276 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1277 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1278 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1279
1280 static ssize_t
1281 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1282 const char *buf, size_t count)
1283 {
1284 struct fc_vport *vport = transport_class_to_vport(dev);
1285 struct Scsi_Host *shost = vport_to_shost(vport);
1286 unsigned long flags;
1287
1288 spin_lock_irqsave(shost->host_lock, flags);
1289 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING | FC_VPORT_DELETING)) {
1290 spin_unlock_irqrestore(shost->host_lock, flags);
1291 return -EBUSY;
1292 }
1293 vport->flags |= FC_VPORT_DELETING;
1294 spin_unlock_irqrestore(shost->host_lock, flags);
1295
1296 fc_queue_work(shost, &vport->vport_delete_work);
1297 return count;
1298 }
1299 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1300 NULL, store_fc_vport_delete);
1301
1302
1303 /*
1304 * Enable/Disable vport
1305 * Write "1" to disable, write "0" to enable
1306 */
1307 static ssize_t
1308 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1309 const char *buf,
1310 size_t count)
1311 {
1312 struct fc_vport *vport = transport_class_to_vport(dev);
1313 struct Scsi_Host *shost = vport_to_shost(vport);
1314 struct fc_internal *i = to_fc_internal(shost->transportt);
1315 int stat;
1316
1317 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1318 return -EBUSY;
1319
1320 if (*buf == '0') {
1321 if (vport->vport_state != FC_VPORT_DISABLED)
1322 return -EALREADY;
1323 } else if (*buf == '1') {
1324 if (vport->vport_state == FC_VPORT_DISABLED)
1325 return -EALREADY;
1326 } else
1327 return -EINVAL;
1328
1329 stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1330 return stat ? stat : count;
1331 }
1332 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1333 NULL, store_fc_vport_disable);
1334
1335
1336 /*
1337 * Host Attribute Management
1338 */
1339
1340 #define fc_host_show_function(field, format_string, sz, cast) \
1341 static ssize_t \
1342 show_fc_host_##field (struct device *dev, \
1343 struct device_attribute *attr, char *buf) \
1344 { \
1345 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1346 struct fc_internal *i = to_fc_internal(shost->transportt); \
1347 if (i->f->get_host_##field) \
1348 i->f->get_host_##field(shost); \
1349 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1350 }
1351
1352 #define fc_host_store_function(field) \
1353 static ssize_t \
1354 store_fc_host_##field(struct device *dev, \
1355 struct device_attribute *attr, \
1356 const char *buf, size_t count) \
1357 { \
1358 int val; \
1359 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1360 struct fc_internal *i = to_fc_internal(shost->transportt); \
1361 char *cp; \
1362 \
1363 val = simple_strtoul(buf, &cp, 0); \
1364 if (*cp && (*cp != '\n')) \
1365 return -EINVAL; \
1366 i->f->set_host_##field(shost, val); \
1367 return count; \
1368 }
1369
1370 #define fc_host_store_str_function(field, slen) \
1371 static ssize_t \
1372 store_fc_host_##field(struct device *dev, \
1373 struct device_attribute *attr, \
1374 const char *buf, size_t count) \
1375 { \
1376 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1377 struct fc_internal *i = to_fc_internal(shost->transportt); \
1378 unsigned int cnt=count; \
1379 \
1380 /* count may include a LF at end of string */ \
1381 if (buf[cnt-1] == '\n') \
1382 cnt--; \
1383 if (cnt > ((slen) - 1)) \
1384 return -EINVAL; \
1385 memcpy(fc_host_##field(shost), buf, cnt); \
1386 i->f->set_host_##field(shost); \
1387 return count; \
1388 }
1389
1390 #define fc_host_rd_attr(field, format_string, sz) \
1391 fc_host_show_function(field, format_string, sz, ) \
1392 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1393 show_fc_host_##field, NULL)
1394
1395 #define fc_host_rd_attr_cast(field, format_string, sz, cast) \
1396 fc_host_show_function(field, format_string, sz, (cast)) \
1397 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1398 show_fc_host_##field, NULL)
1399
1400 #define fc_host_rw_attr(field, format_string, sz) \
1401 fc_host_show_function(field, format_string, sz, ) \
1402 fc_host_store_function(field) \
1403 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
1404 show_fc_host_##field, \
1405 store_fc_host_##field)
1406
1407 #define fc_host_rd_enum_attr(title, maxlen) \
1408 static ssize_t \
1409 show_fc_host_##title (struct device *dev, \
1410 struct device_attribute *attr, char *buf) \
1411 { \
1412 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1413 struct fc_internal *i = to_fc_internal(shost->transportt); \
1414 const char *name; \
1415 if (i->f->get_host_##title) \
1416 i->f->get_host_##title(shost); \
1417 name = get_fc_##title##_name(fc_host_##title(shost)); \
1418 if (!name) \
1419 return -EINVAL; \
1420 return snprintf(buf, maxlen, "%s\n", name); \
1421 } \
1422 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1423
1424 #define SETUP_HOST_ATTRIBUTE_RD(field) \
1425 i->private_host_attrs[count] = device_attr_host_##field; \
1426 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1427 i->private_host_attrs[count].store = NULL; \
1428 i->host_attrs[count] = &i->private_host_attrs[count]; \
1429 if (i->f->show_host_##field) \
1430 count++
1431
1432 #define SETUP_HOST_ATTRIBUTE_RD_NS(field) \
1433 i->private_host_attrs[count] = device_attr_host_##field; \
1434 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1435 i->private_host_attrs[count].store = NULL; \
1436 i->host_attrs[count] = &i->private_host_attrs[count]; \
1437 count++
1438
1439 #define SETUP_HOST_ATTRIBUTE_RW(field) \
1440 i->private_host_attrs[count] = device_attr_host_##field; \
1441 if (!i->f->set_host_##field) { \
1442 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1443 i->private_host_attrs[count].store = NULL; \
1444 } \
1445 i->host_attrs[count] = &i->private_host_attrs[count]; \
1446 if (i->f->show_host_##field) \
1447 count++
1448
1449
1450 #define fc_private_host_show_function(field, format_string, sz, cast) \
1451 static ssize_t \
1452 show_fc_host_##field (struct device *dev, \
1453 struct device_attribute *attr, char *buf) \
1454 { \
1455 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1456 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1457 }
1458
1459 #define fc_private_host_rd_attr(field, format_string, sz) \
1460 fc_private_host_show_function(field, format_string, sz, ) \
1461 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1462 show_fc_host_##field, NULL)
1463
1464 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
1465 fc_private_host_show_function(field, format_string, sz, (cast)) \
1466 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1467 show_fc_host_##field, NULL)
1468
1469 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
1470 i->private_host_attrs[count] = device_attr_host_##field; \
1471 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1472 i->private_host_attrs[count].store = NULL; \
1473 i->host_attrs[count] = &i->private_host_attrs[count]; \
1474 count++
1475
1476 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
1477 { \
1478 i->private_host_attrs[count] = device_attr_host_##field; \
1479 i->host_attrs[count] = &i->private_host_attrs[count]; \
1480 count++; \
1481 }
1482
1483
1484 /* Fixed Host Attributes */
1485
1486 static ssize_t
1487 show_fc_host_supported_classes (struct device *dev,
1488 struct device_attribute *attr, char *buf)
1489 {
1490 struct Scsi_Host *shost = transport_class_to_shost(dev);
1491
1492 if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1493 return snprintf(buf, 20, "unspecified\n");
1494
1495 return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1496 }
1497 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1498 show_fc_host_supported_classes, NULL);
1499
1500 static ssize_t
1501 show_fc_host_supported_fc4s (struct device *dev,
1502 struct device_attribute *attr, char *buf)
1503 {
1504 struct Scsi_Host *shost = transport_class_to_shost(dev);
1505 return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1506 }
1507 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1508 show_fc_host_supported_fc4s, NULL);
1509
1510 static ssize_t
1511 show_fc_host_supported_speeds (struct device *dev,
1512 struct device_attribute *attr, char *buf)
1513 {
1514 struct Scsi_Host *shost = transport_class_to_shost(dev);
1515
1516 if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1517 return snprintf(buf, 20, "unknown\n");
1518
1519 return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1520 }
1521 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1522 show_fc_host_supported_speeds, NULL);
1523
1524
1525 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1526 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1527 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1528 unsigned long long);
1529 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1530 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1531 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1532 fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
1533 fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1534 fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1535 fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1536 fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1537 fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1538 fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1539
1540
1541 /* Dynamic Host Attributes */
1542
1543 static ssize_t
1544 show_fc_host_active_fc4s (struct device *dev,
1545 struct device_attribute *attr, char *buf)
1546 {
1547 struct Scsi_Host *shost = transport_class_to_shost(dev);
1548 struct fc_internal *i = to_fc_internal(shost->transportt);
1549
1550 if (i->f->get_host_active_fc4s)
1551 i->f->get_host_active_fc4s(shost);
1552
1553 return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1554 }
1555 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1556 show_fc_host_active_fc4s, NULL);
1557
1558 static ssize_t
1559 show_fc_host_speed (struct device *dev,
1560 struct device_attribute *attr, char *buf)
1561 {
1562 struct Scsi_Host *shost = transport_class_to_shost(dev);
1563 struct fc_internal *i = to_fc_internal(shost->transportt);
1564
1565 if (i->f->get_host_speed)
1566 i->f->get_host_speed(shost);
1567
1568 if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1569 return snprintf(buf, 20, "unknown\n");
1570
1571 return get_fc_port_speed_names(fc_host_speed(shost), buf);
1572 }
1573 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1574 show_fc_host_speed, NULL);
1575
1576
1577 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1578 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1579 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1580 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1581 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1582
1583 fc_private_host_show_function(system_hostname, "%s\n",
1584 FC_SYMBOLIC_NAME_SIZE + 1, )
1585 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1586 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1587 show_fc_host_system_hostname, store_fc_host_system_hostname);
1588
1589
1590 /* Private Host Attributes */
1591
1592 static ssize_t
1593 show_fc_private_host_tgtid_bind_type(struct device *dev,
1594 struct device_attribute *attr, char *buf)
1595 {
1596 struct Scsi_Host *shost = transport_class_to_shost(dev);
1597 const char *name;
1598
1599 name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1600 if (!name)
1601 return -EINVAL;
1602 return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1603 }
1604
1605 #define get_list_head_entry(pos, head, member) \
1606 pos = list_entry((head)->next, typeof(*pos), member)
1607
1608 static ssize_t
1609 store_fc_private_host_tgtid_bind_type(struct device *dev,
1610 struct device_attribute *attr, const char *buf, size_t count)
1611 {
1612 struct Scsi_Host *shost = transport_class_to_shost(dev);
1613 struct fc_rport *rport;
1614 enum fc_tgtid_binding_type val;
1615 unsigned long flags;
1616
1617 if (get_fc_tgtid_bind_type_match(buf, &val))
1618 return -EINVAL;
1619
1620 /* if changing bind type, purge all unused consistent bindings */
1621 if (val != fc_host_tgtid_bind_type(shost)) {
1622 spin_lock_irqsave(shost->host_lock, flags);
1623 while (!list_empty(&fc_host_rport_bindings(shost))) {
1624 get_list_head_entry(rport,
1625 &fc_host_rport_bindings(shost), peers);
1626 list_del(&rport->peers);
1627 rport->port_state = FC_PORTSTATE_DELETED;
1628 fc_queue_work(shost, &rport->rport_delete_work);
1629 }
1630 spin_unlock_irqrestore(shost->host_lock, flags);
1631 }
1632
1633 fc_host_tgtid_bind_type(shost) = val;
1634 return count;
1635 }
1636
1637 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1638 show_fc_private_host_tgtid_bind_type,
1639 store_fc_private_host_tgtid_bind_type);
1640
1641 static ssize_t
1642 store_fc_private_host_issue_lip(struct device *dev,
1643 struct device_attribute *attr, const char *buf, size_t count)
1644 {
1645 struct Scsi_Host *shost = transport_class_to_shost(dev);
1646 struct fc_internal *i = to_fc_internal(shost->transportt);
1647 int ret;
1648
1649 /* ignore any data value written to the attribute */
1650 if (i->f->issue_fc_host_lip) {
1651 ret = i->f->issue_fc_host_lip(shost);
1652 return ret ? ret: count;
1653 }
1654
1655 return -ENOENT;
1656 }
1657
1658 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1659 store_fc_private_host_issue_lip);
1660
1661 static ssize_t
1662 store_fc_private_host_dev_loss_tmo(struct device *dev,
1663 struct device_attribute *attr,
1664 const char *buf, size_t count)
1665 {
1666 struct Scsi_Host *shost = transport_class_to_shost(dev);
1667 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1668 struct fc_rport *rport;
1669 unsigned long val, flags;
1670 int rc;
1671
1672 rc = fc_str_to_dev_loss(buf, &val);
1673 if (rc)
1674 return rc;
1675
1676 fc_host_dev_loss_tmo(shost) = val;
1677 spin_lock_irqsave(shost->host_lock, flags);
1678 list_for_each_entry(rport, &fc_host->rports, peers)
1679 fc_rport_set_dev_loss_tmo(rport, val);
1680 spin_unlock_irqrestore(shost->host_lock, flags);
1681 return count;
1682 }
1683
1684 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
1685 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
1686 show_fc_host_dev_loss_tmo,
1687 store_fc_private_host_dev_loss_tmo);
1688
1689 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1690
1691 /*
1692 * Host Statistics Management
1693 */
1694
1695 /* Show a given attribute in the statistics group */
1696 static ssize_t
1697 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1698 {
1699 struct Scsi_Host *shost = transport_class_to_shost(dev);
1700 struct fc_internal *i = to_fc_internal(shost->transportt);
1701 struct fc_host_statistics *stats;
1702 ssize_t ret = -ENOENT;
1703
1704 if (offset > sizeof(struct fc_host_statistics) ||
1705 offset % sizeof(u64) != 0)
1706 WARN_ON(1);
1707
1708 if (i->f->get_fc_host_stats) {
1709 stats = (i->f->get_fc_host_stats)(shost);
1710 if (stats)
1711 ret = snprintf(buf, 20, "0x%llx\n",
1712 (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1713 }
1714 return ret;
1715 }
1716
1717
1718 /* generate a read-only statistics attribute */
1719 #define fc_host_statistic(name) \
1720 static ssize_t show_fcstat_##name(struct device *cd, \
1721 struct device_attribute *attr, \
1722 char *buf) \
1723 { \
1724 return fc_stat_show(cd, buf, \
1725 offsetof(struct fc_host_statistics, name)); \
1726 } \
1727 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1728
1729 fc_host_statistic(seconds_since_last_reset);
1730 fc_host_statistic(tx_frames);
1731 fc_host_statistic(tx_words);
1732 fc_host_statistic(rx_frames);
1733 fc_host_statistic(rx_words);
1734 fc_host_statistic(lip_count);
1735 fc_host_statistic(nos_count);
1736 fc_host_statistic(error_frames);
1737 fc_host_statistic(dumped_frames);
1738 fc_host_statistic(link_failure_count);
1739 fc_host_statistic(loss_of_sync_count);
1740 fc_host_statistic(loss_of_signal_count);
1741 fc_host_statistic(prim_seq_protocol_err_count);
1742 fc_host_statistic(invalid_tx_word_count);
1743 fc_host_statistic(invalid_crc_count);
1744 fc_host_statistic(fcp_input_requests);
1745 fc_host_statistic(fcp_output_requests);
1746 fc_host_statistic(fcp_control_requests);
1747 fc_host_statistic(fcp_input_megabytes);
1748 fc_host_statistic(fcp_output_megabytes);
1749 fc_host_statistic(fcp_packet_alloc_failures);
1750 fc_host_statistic(fcp_packet_aborts);
1751 fc_host_statistic(fcp_frame_alloc_failures);
1752 fc_host_statistic(fc_no_free_exch);
1753 fc_host_statistic(fc_no_free_exch_xid);
1754 fc_host_statistic(fc_xid_not_found);
1755 fc_host_statistic(fc_xid_busy);
1756 fc_host_statistic(fc_seq_not_found);
1757 fc_host_statistic(fc_non_bls_resp);
1758
1759 static ssize_t
1760 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1761 const char *buf, size_t count)
1762 {
1763 struct Scsi_Host *shost = transport_class_to_shost(dev);
1764 struct fc_internal *i = to_fc_internal(shost->transportt);
1765
1766 /* ignore any data value written to the attribute */
1767 if (i->f->reset_fc_host_stats) {
1768 i->f->reset_fc_host_stats(shost);
1769 return count;
1770 }
1771
1772 return -ENOENT;
1773 }
1774 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1775 fc_reset_statistics);
1776
1777 static struct attribute *fc_statistics_attrs[] = {
1778 &device_attr_host_seconds_since_last_reset.attr,
1779 &device_attr_host_tx_frames.attr,
1780 &device_attr_host_tx_words.attr,
1781 &device_attr_host_rx_frames.attr,
1782 &device_attr_host_rx_words.attr,
1783 &device_attr_host_lip_count.attr,
1784 &device_attr_host_nos_count.attr,
1785 &device_attr_host_error_frames.attr,
1786 &device_attr_host_dumped_frames.attr,
1787 &device_attr_host_link_failure_count.attr,
1788 &device_attr_host_loss_of_sync_count.attr,
1789 &device_attr_host_loss_of_signal_count.attr,
1790 &device_attr_host_prim_seq_protocol_err_count.attr,
1791 &device_attr_host_invalid_tx_word_count.attr,
1792 &device_attr_host_invalid_crc_count.attr,
1793 &device_attr_host_fcp_input_requests.attr,
1794 &device_attr_host_fcp_output_requests.attr,
1795 &device_attr_host_fcp_control_requests.attr,
1796 &device_attr_host_fcp_input_megabytes.attr,
1797 &device_attr_host_fcp_output_megabytes.attr,
1798 &device_attr_host_fcp_packet_alloc_failures.attr,
1799 &device_attr_host_fcp_packet_aborts.attr,
1800 &device_attr_host_fcp_frame_alloc_failures.attr,
1801 &device_attr_host_fc_no_free_exch.attr,
1802 &device_attr_host_fc_no_free_exch_xid.attr,
1803 &device_attr_host_fc_xid_not_found.attr,
1804 &device_attr_host_fc_xid_busy.attr,
1805 &device_attr_host_fc_seq_not_found.attr,
1806 &device_attr_host_fc_non_bls_resp.attr,
1807 &device_attr_host_reset_statistics.attr,
1808 NULL
1809 };
1810
1811 static struct attribute_group fc_statistics_group = {
1812 .name = "statistics",
1813 .attrs = fc_statistics_attrs,
1814 };
1815
1816
1817 /* Host Vport Attributes */
1818
1819 static int
1820 fc_parse_wwn(const char *ns, u64 *nm)
1821 {
1822 unsigned int i, j;
1823 u8 wwn[8];
1824
1825 memset(wwn, 0, sizeof(wwn));
1826
1827 /* Validate and store the new name */
1828 for (i=0, j=0; i < 16; i++) {
1829 int value;
1830
1831 value = hex_to_bin(*ns++);
1832 if (value >= 0)
1833 j = (j << 4) | value;
1834 else
1835 return -EINVAL;
1836 if (i % 2) {
1837 wwn[i/2] = j & 0xff;
1838 j = 0;
1839 }
1840 }
1841
1842 *nm = wwn_to_u64(wwn);
1843
1844 return 0;
1845 }
1846
1847
1848 /*
1849 * "Short-cut" sysfs variable to create a new vport on a FC Host.
1850 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1851 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1852 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1853 */
1854 static ssize_t
1855 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1856 const char *buf, size_t count)
1857 {
1858 struct Scsi_Host *shost = transport_class_to_shost(dev);
1859 struct fc_vport_identifiers vid;
1860 struct fc_vport *vport;
1861 unsigned int cnt=count;
1862 int stat;
1863
1864 memset(&vid, 0, sizeof(vid));
1865
1866 /* count may include a LF at end of string */
1867 if (buf[cnt-1] == '\n')
1868 cnt--;
1869
1870 /* validate we have enough characters for WWPN */
1871 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1872 return -EINVAL;
1873
1874 stat = fc_parse_wwn(&buf[0], &vid.port_name);
1875 if (stat)
1876 return stat;
1877
1878 stat = fc_parse_wwn(&buf[17], &vid.node_name);
1879 if (stat)
1880 return stat;
1881
1882 vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1883 vid.vport_type = FC_PORTTYPE_NPIV;
1884 /* vid.symbolic_name is already zero/NULL's */
1885 vid.disable = false; /* always enabled */
1886
1887 /* we only allow support on Channel 0 !!! */
1888 stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1889 return stat ? stat : count;
1890 }
1891 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1892 store_fc_host_vport_create);
1893
1894
1895 /*
1896 * "Short-cut" sysfs variable to delete a vport on a FC Host.
1897 * Vport is identified by a string containing "<WWPN>:<WWNN>".
1898 * The WWNs are specified as hex characters, and may *not* contain
1899 * any prefixes (e.g. 0x, x, etc)
1900 */
1901 static ssize_t
1902 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1903 const char *buf, size_t count)
1904 {
1905 struct Scsi_Host *shost = transport_class_to_shost(dev);
1906 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1907 struct fc_vport *vport;
1908 u64 wwpn, wwnn;
1909 unsigned long flags;
1910 unsigned int cnt=count;
1911 int stat, match;
1912
1913 /* count may include a LF at end of string */
1914 if (buf[cnt-1] == '\n')
1915 cnt--;
1916
1917 /* validate we have enough characters for WWPN */
1918 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1919 return -EINVAL;
1920
1921 stat = fc_parse_wwn(&buf[0], &wwpn);
1922 if (stat)
1923 return stat;
1924
1925 stat = fc_parse_wwn(&buf[17], &wwnn);
1926 if (stat)
1927 return stat;
1928
1929 spin_lock_irqsave(shost->host_lock, flags);
1930 match = 0;
1931 /* we only allow support on Channel 0 !!! */
1932 list_for_each_entry(vport, &fc_host->vports, peers) {
1933 if ((vport->channel == 0) &&
1934 (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1935 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1936 break;
1937 vport->flags |= FC_VPORT_DELETING;
1938 match = 1;
1939 break;
1940 }
1941 }
1942 spin_unlock_irqrestore(shost->host_lock, flags);
1943
1944 if (!match)
1945 return -ENODEV;
1946
1947 stat = fc_vport_terminate(vport);
1948 return stat ? stat : count;
1949 }
1950 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1951 store_fc_host_vport_delete);
1952
1953
1954 static int fc_host_match(struct attribute_container *cont,
1955 struct device *dev)
1956 {
1957 struct Scsi_Host *shost;
1958 struct fc_internal *i;
1959
1960 if (!scsi_is_host_device(dev))
1961 return 0;
1962
1963 shost = dev_to_shost(dev);
1964 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1965 != &fc_host_class.class)
1966 return 0;
1967
1968 i = to_fc_internal(shost->transportt);
1969
1970 return &i->t.host_attrs.ac == cont;
1971 }
1972
1973 static int fc_target_match(struct attribute_container *cont,
1974 struct device *dev)
1975 {
1976 struct Scsi_Host *shost;
1977 struct fc_internal *i;
1978
1979 if (!scsi_is_target_device(dev))
1980 return 0;
1981
1982 shost = dev_to_shost(dev->parent);
1983 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1984 != &fc_host_class.class)
1985 return 0;
1986
1987 i = to_fc_internal(shost->transportt);
1988
1989 return &i->t.target_attrs.ac == cont;
1990 }
1991
1992 static void fc_rport_dev_release(struct device *dev)
1993 {
1994 struct fc_rport *rport = dev_to_rport(dev);
1995 put_device(dev->parent);
1996 kfree(rport);
1997 }
1998
1999 int scsi_is_fc_rport(const struct device *dev)
2000 {
2001 return dev->release == fc_rport_dev_release;
2002 }
2003 EXPORT_SYMBOL(scsi_is_fc_rport);
2004
2005 static int fc_rport_match(struct attribute_container *cont,
2006 struct device *dev)
2007 {
2008 struct Scsi_Host *shost;
2009 struct fc_internal *i;
2010
2011 if (!scsi_is_fc_rport(dev))
2012 return 0;
2013
2014 shost = dev_to_shost(dev->parent);
2015 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2016 != &fc_host_class.class)
2017 return 0;
2018
2019 i = to_fc_internal(shost->transportt);
2020
2021 return &i->rport_attr_cont.ac == cont;
2022 }
2023
2024
2025 static void fc_vport_dev_release(struct device *dev)
2026 {
2027 struct fc_vport *vport = dev_to_vport(dev);
2028 put_device(dev->parent); /* release kobj parent */
2029 kfree(vport);
2030 }
2031
2032 static int scsi_is_fc_vport(const struct device *dev)
2033 {
2034 return dev->release == fc_vport_dev_release;
2035 }
2036
2037 static int fc_vport_match(struct attribute_container *cont,
2038 struct device *dev)
2039 {
2040 struct fc_vport *vport;
2041 struct Scsi_Host *shost;
2042 struct fc_internal *i;
2043
2044 if (!scsi_is_fc_vport(dev))
2045 return 0;
2046 vport = dev_to_vport(dev);
2047
2048 shost = vport_to_shost(vport);
2049 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2050 != &fc_host_class.class)
2051 return 0;
2052
2053 i = to_fc_internal(shost->transportt);
2054 return &i->vport_attr_cont.ac == cont;
2055 }
2056
2057
2058 /**
2059 * fc_eh_timed_out - FC Transport I/O timeout intercept handler
2060 * @scmd: The SCSI command which timed out
2061 *
2062 * This routine protects against error handlers getting invoked while a
2063 * rport is in a blocked state, typically due to a temporarily loss of
2064 * connectivity. If the error handlers are allowed to proceed, requests
2065 * to abort i/o, reset the target, etc will likely fail as there is no way
2066 * to communicate with the device to perform the requested function. These
2067 * failures may result in the midlayer taking the device offline, requiring
2068 * manual intervention to restore operation.
2069 *
2070 * This routine, called whenever an i/o times out, validates the state of
2071 * the underlying rport. If the rport is blocked, it returns
2072 * EH_RESET_TIMER, which will continue to reschedule the timeout.
2073 * Eventually, either the device will return, or devloss_tmo will fire,
2074 * and when the timeout then fires, it will be handled normally.
2075 * If the rport is not blocked, normal error handling continues.
2076 *
2077 * Notes:
2078 * This routine assumes no locks are held on entry.
2079 */
2080 enum blk_eh_timer_return
2081 fc_eh_timed_out(struct scsi_cmnd *scmd)
2082 {
2083 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2084
2085 if (rport->port_state == FC_PORTSTATE_BLOCKED)
2086 return BLK_EH_RESET_TIMER;
2087
2088 return BLK_EH_NOT_HANDLED;
2089 }
2090 EXPORT_SYMBOL(fc_eh_timed_out);
2091
2092 /*
2093 * Called by fc_user_scan to locate an rport on the shost that
2094 * matches the channel and target id, and invoke scsi_scan_target()
2095 * on the rport.
2096 */
2097 static void
2098 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2099 {
2100 struct fc_rport *rport;
2101 unsigned long flags;
2102
2103 spin_lock_irqsave(shost->host_lock, flags);
2104
2105 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2106 if (rport->scsi_target_id == -1)
2107 continue;
2108
2109 if (rport->port_state != FC_PORTSTATE_ONLINE)
2110 continue;
2111
2112 if ((channel == rport->channel) &&
2113 (id == rport->scsi_target_id)) {
2114 spin_unlock_irqrestore(shost->host_lock, flags);
2115 scsi_scan_target(&rport->dev, channel, id, lun,
2116 SCSI_SCAN_MANUAL);
2117 return;
2118 }
2119 }
2120
2121 spin_unlock_irqrestore(shost->host_lock, flags);
2122 }
2123
2124 /*
2125 * Called via sysfs scan routines. Necessary, as the FC transport
2126 * wants to place all target objects below the rport object. So this
2127 * routine must invoke the scsi_scan_target() routine with the rport
2128 * object as the parent.
2129 */
2130 static int
2131 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2132 {
2133 uint chlo, chhi;
2134 uint tgtlo, tgthi;
2135
2136 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2137 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2138 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2139 return -EINVAL;
2140
2141 if (channel == SCAN_WILD_CARD) {
2142 chlo = 0;
2143 chhi = shost->max_channel + 1;
2144 } else {
2145 chlo = channel;
2146 chhi = channel + 1;
2147 }
2148
2149 if (id == SCAN_WILD_CARD) {
2150 tgtlo = 0;
2151 tgthi = shost->max_id;
2152 } else {
2153 tgtlo = id;
2154 tgthi = id + 1;
2155 }
2156
2157 for ( ; chlo < chhi; chlo++)
2158 for ( ; tgtlo < tgthi; tgtlo++)
2159 fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2160
2161 return 0;
2162 }
2163
2164 struct scsi_transport_template *
2165 fc_attach_transport(struct fc_function_template *ft)
2166 {
2167 int count;
2168 struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2169 GFP_KERNEL);
2170
2171 if (unlikely(!i))
2172 return NULL;
2173
2174 i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2175 i->t.target_attrs.ac.class = &fc_transport_class.class;
2176 i->t.target_attrs.ac.match = fc_target_match;
2177 i->t.target_size = sizeof(struct fc_starget_attrs);
2178 transport_container_register(&i->t.target_attrs);
2179
2180 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2181 i->t.host_attrs.ac.class = &fc_host_class.class;
2182 i->t.host_attrs.ac.match = fc_host_match;
2183 i->t.host_size = sizeof(struct fc_host_attrs);
2184 if (ft->get_fc_host_stats)
2185 i->t.host_attrs.statistics = &fc_statistics_group;
2186 transport_container_register(&i->t.host_attrs);
2187
2188 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2189 i->rport_attr_cont.ac.class = &fc_rport_class.class;
2190 i->rport_attr_cont.ac.match = fc_rport_match;
2191 transport_container_register(&i->rport_attr_cont);
2192
2193 i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2194 i->vport_attr_cont.ac.class = &fc_vport_class.class;
2195 i->vport_attr_cont.ac.match = fc_vport_match;
2196 transport_container_register(&i->vport_attr_cont);
2197
2198 i->f = ft;
2199
2200 /* Transport uses the shost workq for scsi scanning */
2201 i->t.create_work_queue = 1;
2202
2203 i->t.user_scan = fc_user_scan;
2204
2205 /*
2206 * Setup SCSI Target Attributes.
2207 */
2208 count = 0;
2209 SETUP_STARGET_ATTRIBUTE_RD(node_name);
2210 SETUP_STARGET_ATTRIBUTE_RD(port_name);
2211 SETUP_STARGET_ATTRIBUTE_RD(port_id);
2212
2213 BUG_ON(count > FC_STARGET_NUM_ATTRS);
2214
2215 i->starget_attrs[count] = NULL;
2216
2217
2218 /*
2219 * Setup SCSI Host Attributes.
2220 */
2221 count=0;
2222 SETUP_HOST_ATTRIBUTE_RD(node_name);
2223 SETUP_HOST_ATTRIBUTE_RD(port_name);
2224 SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2225 SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2226 SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2227 SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2228 SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2229 if (ft->vport_create) {
2230 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2231 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2232 }
2233 SETUP_HOST_ATTRIBUTE_RD(serial_number);
2234 SETUP_HOST_ATTRIBUTE_RD(manufacturer);
2235 SETUP_HOST_ATTRIBUTE_RD(model);
2236 SETUP_HOST_ATTRIBUTE_RD(model_description);
2237 SETUP_HOST_ATTRIBUTE_RD(hardware_version);
2238 SETUP_HOST_ATTRIBUTE_RD(driver_version);
2239 SETUP_HOST_ATTRIBUTE_RD(firmware_version);
2240 SETUP_HOST_ATTRIBUTE_RD(optionrom_version);
2241
2242 SETUP_HOST_ATTRIBUTE_RD(port_id);
2243 SETUP_HOST_ATTRIBUTE_RD(port_type);
2244 SETUP_HOST_ATTRIBUTE_RD(port_state);
2245 SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2246 SETUP_HOST_ATTRIBUTE_RD(speed);
2247 SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2248 SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2249 SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2250
2251 /* Transport-managed attributes */
2252 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2253 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2254 if (ft->issue_fc_host_lip)
2255 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2256 if (ft->vport_create)
2257 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2258 if (ft->vport_delete)
2259 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2260
2261 BUG_ON(count > FC_HOST_NUM_ATTRS);
2262
2263 i->host_attrs[count] = NULL;
2264
2265 /*
2266 * Setup Remote Port Attributes.
2267 */
2268 count=0;
2269 SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2270 SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2271 SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2272 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2273 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2274 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2275 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2276 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2277 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2278 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2279
2280 BUG_ON(count > FC_RPORT_NUM_ATTRS);
2281
2282 i->rport_attrs[count] = NULL;
2283
2284 /*
2285 * Setup Virtual Port Attributes.
2286 */
2287 count=0;
2288 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2289 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2290 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2291 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2292 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2293 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2294 SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2295 SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2296 SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2297
2298 BUG_ON(count > FC_VPORT_NUM_ATTRS);
2299
2300 i->vport_attrs[count] = NULL;
2301
2302 return &i->t;
2303 }
2304 EXPORT_SYMBOL(fc_attach_transport);
2305
2306 void fc_release_transport(struct scsi_transport_template *t)
2307 {
2308 struct fc_internal *i = to_fc_internal(t);
2309
2310 transport_container_unregister(&i->t.target_attrs);
2311 transport_container_unregister(&i->t.host_attrs);
2312 transport_container_unregister(&i->rport_attr_cont);
2313 transport_container_unregister(&i->vport_attr_cont);
2314
2315 kfree(i);
2316 }
2317 EXPORT_SYMBOL(fc_release_transport);
2318
2319 /**
2320 * fc_queue_work - Queue work to the fc_host workqueue.
2321 * @shost: Pointer to Scsi_Host bound to fc_host.
2322 * @work: Work to queue for execution.
2323 *
2324 * Return value:
2325 * 1 - work queued for execution
2326 * 0 - work is already queued
2327 * -EINVAL - work queue doesn't exist
2328 */
2329 static int
2330 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2331 {
2332 if (unlikely(!fc_host_work_q(shost))) {
2333 printk(KERN_ERR
2334 "ERROR: FC host '%s' attempted to queue work, "
2335 "when no workqueue created.\n", shost->hostt->name);
2336 dump_stack();
2337
2338 return -EINVAL;
2339 }
2340
2341 return queue_work(fc_host_work_q(shost), work);
2342 }
2343
2344 /**
2345 * fc_flush_work - Flush a fc_host's workqueue.
2346 * @shost: Pointer to Scsi_Host bound to fc_host.
2347 */
2348 static void
2349 fc_flush_work(struct Scsi_Host *shost)
2350 {
2351 if (!fc_host_work_q(shost)) {
2352 printk(KERN_ERR
2353 "ERROR: FC host '%s' attempted to flush work, "
2354 "when no workqueue created.\n", shost->hostt->name);
2355 dump_stack();
2356 return;
2357 }
2358
2359 flush_workqueue(fc_host_work_q(shost));
2360 }
2361
2362 /**
2363 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2364 * @shost: Pointer to Scsi_Host bound to fc_host.
2365 * @work: Work to queue for execution.
2366 * @delay: jiffies to delay the work queuing
2367 *
2368 * Return value:
2369 * 1 on success / 0 already queued / < 0 for error
2370 */
2371 static int
2372 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2373 unsigned long delay)
2374 {
2375 if (unlikely(!fc_host_devloss_work_q(shost))) {
2376 printk(KERN_ERR
2377 "ERROR: FC host '%s' attempted to queue work, "
2378 "when no workqueue created.\n", shost->hostt->name);
2379 dump_stack();
2380
2381 return -EINVAL;
2382 }
2383
2384 return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2385 }
2386
2387 /**
2388 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2389 * @shost: Pointer to Scsi_Host bound to fc_host.
2390 */
2391 static void
2392 fc_flush_devloss(struct Scsi_Host *shost)
2393 {
2394 if (!fc_host_devloss_work_q(shost)) {
2395 printk(KERN_ERR
2396 "ERROR: FC host '%s' attempted to flush work, "
2397 "when no workqueue created.\n", shost->hostt->name);
2398 dump_stack();
2399 return;
2400 }
2401
2402 flush_workqueue(fc_host_devloss_work_q(shost));
2403 }
2404
2405
2406 /**
2407 * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2408 * @shost: Which &Scsi_Host
2409 *
2410 * This routine is expected to be called immediately preceding the
2411 * a driver's call to scsi_remove_host().
2412 *
2413 * WARNING: A driver utilizing the fc_transport, which fails to call
2414 * this routine prior to scsi_remove_host(), will leave dangling
2415 * objects in /sys/class/fc_remote_ports. Access to any of these
2416 * objects can result in a system crash !!!
2417 *
2418 * Notes:
2419 * This routine assumes no locks are held on entry.
2420 */
2421 void
2422 fc_remove_host(struct Scsi_Host *shost)
2423 {
2424 struct fc_vport *vport = NULL, *next_vport = NULL;
2425 struct fc_rport *rport = NULL, *next_rport = NULL;
2426 struct workqueue_struct *work_q;
2427 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2428 unsigned long flags;
2429
2430 spin_lock_irqsave(shost->host_lock, flags);
2431
2432 /* Remove any vports */
2433 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2434 vport->flags |= FC_VPORT_DELETING;
2435 fc_queue_work(shost, &vport->vport_delete_work);
2436 }
2437
2438 /* Remove any remote ports */
2439 list_for_each_entry_safe(rport, next_rport,
2440 &fc_host->rports, peers) {
2441 list_del(&rport->peers);
2442 rport->port_state = FC_PORTSTATE_DELETED;
2443 fc_queue_work(shost, &rport->rport_delete_work);
2444 }
2445
2446 list_for_each_entry_safe(rport, next_rport,
2447 &fc_host->rport_bindings, peers) {
2448 list_del(&rport->peers);
2449 rport->port_state = FC_PORTSTATE_DELETED;
2450 fc_queue_work(shost, &rport->rport_delete_work);
2451 }
2452
2453 spin_unlock_irqrestore(shost->host_lock, flags);
2454
2455 /* flush all scan work items */
2456 scsi_flush_work(shost);
2457
2458 /* flush all stgt delete, and rport delete work items, then kill it */
2459 if (fc_host->work_q) {
2460 work_q = fc_host->work_q;
2461 fc_host->work_q = NULL;
2462 destroy_workqueue(work_q);
2463 }
2464
2465 /* flush all devloss work items, then kill it */
2466 if (fc_host->devloss_work_q) {
2467 work_q = fc_host->devloss_work_q;
2468 fc_host->devloss_work_q = NULL;
2469 destroy_workqueue(work_q);
2470 }
2471 }
2472 EXPORT_SYMBOL(fc_remove_host);
2473
2474 static void fc_terminate_rport_io(struct fc_rport *rport)
2475 {
2476 struct Scsi_Host *shost = rport_to_shost(rport);
2477 struct fc_internal *i = to_fc_internal(shost->transportt);
2478
2479 /* Involve the LLDD if possible to terminate all io on the rport. */
2480 if (i->f->terminate_rport_io)
2481 i->f->terminate_rport_io(rport);
2482
2483 /*
2484 * Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
2485 */
2486 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
2487 }
2488
2489 /**
2490 * fc_starget_delete - called to delete the scsi descendants of an rport
2491 * @work: remote port to be operated on.
2492 *
2493 * Deletes target and all sdevs.
2494 */
2495 static void
2496 fc_starget_delete(struct work_struct *work)
2497 {
2498 struct fc_rport *rport =
2499 container_of(work, struct fc_rport, stgt_delete_work);
2500
2501 fc_terminate_rport_io(rport);
2502 scsi_remove_target(&rport->dev);
2503 }
2504
2505
2506 /**
2507 * fc_rport_final_delete - finish rport termination and delete it.
2508 * @work: remote port to be deleted.
2509 */
2510 static void
2511 fc_rport_final_delete(struct work_struct *work)
2512 {
2513 struct fc_rport *rport =
2514 container_of(work, struct fc_rport, rport_delete_work);
2515 struct device *dev = &rport->dev;
2516 struct Scsi_Host *shost = rport_to_shost(rport);
2517 struct fc_internal *i = to_fc_internal(shost->transportt);
2518 unsigned long flags;
2519 int do_callback = 0;
2520
2521 fc_terminate_rport_io(rport);
2522
2523 /*
2524 * if a scan is pending, flush the SCSI Host work_q so that
2525 * that we can reclaim the rport scan work element.
2526 */
2527 if (rport->flags & FC_RPORT_SCAN_PENDING)
2528 scsi_flush_work(shost);
2529
2530 /*
2531 * Cancel any outstanding timers. These should really exist
2532 * only when rmmod'ing the LLDD and we're asking for
2533 * immediate termination of the rports
2534 */
2535 spin_lock_irqsave(shost->host_lock, flags);
2536 if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2537 spin_unlock_irqrestore(shost->host_lock, flags);
2538 if (!cancel_delayed_work(&rport->fail_io_work))
2539 fc_flush_devloss(shost);
2540 if (!cancel_delayed_work(&rport->dev_loss_work))
2541 fc_flush_devloss(shost);
2542 cancel_work_sync(&rport->scan_work);
2543 spin_lock_irqsave(shost->host_lock, flags);
2544 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2545 }
2546 spin_unlock_irqrestore(shost->host_lock, flags);
2547
2548 /* Delete SCSI target and sdevs */
2549 if (rport->scsi_target_id != -1)
2550 fc_starget_delete(&rport->stgt_delete_work);
2551
2552 /*
2553 * Notify the driver that the rport is now dead. The LLDD will
2554 * also guarantee that any communication to the rport is terminated
2555 *
2556 * Avoid this call if we already called it when we preserved the
2557 * rport for the binding.
2558 */
2559 spin_lock_irqsave(shost->host_lock, flags);
2560 if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2561 (i->f->dev_loss_tmo_callbk)) {
2562 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2563 do_callback = 1;
2564 }
2565 spin_unlock_irqrestore(shost->host_lock, flags);
2566
2567 if (do_callback)
2568 i->f->dev_loss_tmo_callbk(rport);
2569
2570 fc_bsg_remove(rport->rqst_q);
2571
2572 transport_remove_device(dev);
2573 device_del(dev);
2574 transport_destroy_device(dev);
2575 scsi_host_put(shost); /* for fc_host->rport list */
2576 put_device(dev); /* for self-reference */
2577 }
2578
2579
2580 /**
2581 * fc_remote_port_create - allocates and creates a remote FC port.
2582 * @shost: scsi host the remote port is connected to.
2583 * @channel: Channel on shost port connected to.
2584 * @ids: The world wide names, fc address, and FC4 port
2585 * roles for the remote port.
2586 *
2587 * Allocates and creates the remoter port structure, including the
2588 * class and sysfs creation.
2589 *
2590 * Notes:
2591 * This routine assumes no locks are held on entry.
2592 */
2593 static struct fc_rport *
2594 fc_remote_port_create(struct Scsi_Host *shost, int channel,
2595 struct fc_rport_identifiers *ids)
2596 {
2597 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2598 struct fc_internal *fci = to_fc_internal(shost->transportt);
2599 struct fc_rport *rport;
2600 struct device *dev;
2601 unsigned long flags;
2602 int error;
2603 size_t size;
2604
2605 size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2606 rport = kzalloc(size, GFP_KERNEL);
2607 if (unlikely(!rport)) {
2608 printk(KERN_ERR "%s: allocation failure\n", __func__);
2609 return NULL;
2610 }
2611
2612 rport->maxframe_size = -1;
2613 rport->supported_classes = FC_COS_UNSPECIFIED;
2614 rport->dev_loss_tmo = fc_host->dev_loss_tmo;
2615 memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2616 memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2617 rport->port_id = ids->port_id;
2618 rport->roles = ids->roles;
2619 rport->port_state = FC_PORTSTATE_ONLINE;
2620 if (fci->f->dd_fcrport_size)
2621 rport->dd_data = &rport[1];
2622 rport->channel = channel;
2623 rport->fast_io_fail_tmo = -1;
2624
2625 INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2626 INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2627 INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2628 INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2629 INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2630
2631 spin_lock_irqsave(shost->host_lock, flags);
2632
2633 rport->number = fc_host->next_rport_number++;
2634 if ((rport->roles & FC_PORT_ROLE_FCP_TARGET) ||
2635 (rport->roles & FC_PORT_ROLE_FCP_DUMMY_INITIATOR))
2636 rport->scsi_target_id = fc_host->next_target_id++;
2637 else
2638 rport->scsi_target_id = -1;
2639 list_add_tail(&rport->peers, &fc_host->rports);
2640 scsi_host_get(shost); /* for fc_host->rport list */
2641
2642 spin_unlock_irqrestore(shost->host_lock, flags);
2643
2644 dev = &rport->dev;
2645 device_initialize(dev); /* takes self reference */
2646 dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2647 dev->release = fc_rport_dev_release;
2648 dev_set_name(dev, "rport-%d:%d-%d",
2649 shost->host_no, channel, rport->number);
2650 transport_setup_device(dev);
2651
2652 error = device_add(dev);
2653 if (error) {
2654 printk(KERN_ERR "FC Remote Port device_add failed\n");
2655 goto delete_rport;
2656 }
2657 transport_add_device(dev);
2658 transport_configure_device(dev);
2659
2660 fc_bsg_rportadd(shost, rport);
2661 /* ignore any bsg add error - we just can't do sgio */
2662
2663 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2664 /* initiate a scan of the target */
2665 rport->flags |= FC_RPORT_SCAN_PENDING;
2666 scsi_queue_work(shost, &rport->scan_work);
2667 }
2668
2669 return rport;
2670
2671 delete_rport:
2672 transport_destroy_device(dev);
2673 spin_lock_irqsave(shost->host_lock, flags);
2674 list_del(&rport->peers);
2675 scsi_host_put(shost); /* for fc_host->rport list */
2676 spin_unlock_irqrestore(shost->host_lock, flags);
2677 put_device(dev->parent);
2678 kfree(rport);
2679 return NULL;
2680 }
2681
2682 /**
2683 * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2684 * @shost: scsi host the remote port is connected to.
2685 * @channel: Channel on shost port connected to.
2686 * @ids: The world wide names, fc address, and FC4 port
2687 * roles for the remote port.
2688 *
2689 * The LLDD calls this routine to notify the transport of the existence
2690 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2691 * of the port, it's FC address (port_id), and the FC4 roles that are
2692 * active for the port.
2693 *
2694 * For ports that are FCP targets (aka scsi targets), the FC transport
2695 * maintains consistent target id bindings on behalf of the LLDD.
2696 * A consistent target id binding is an assignment of a target id to
2697 * a remote port identifier, which persists while the scsi host is
2698 * attached. The remote port can disappear, then later reappear, and
2699 * it's target id assignment remains the same. This allows for shifts
2700 * in FC addressing (if binding by wwpn or wwnn) with no apparent
2701 * changes to the scsi subsystem which is based on scsi host number and
2702 * target id values. Bindings are only valid during the attachment of
2703 * the scsi host. If the host detaches, then later re-attaches, target
2704 * id bindings may change.
2705 *
2706 * This routine is responsible for returning a remote port structure.
2707 * The routine will search the list of remote ports it maintains
2708 * internally on behalf of consistent target id mappings. If found, the
2709 * remote port structure will be reused. Otherwise, a new remote port
2710 * structure will be allocated.
2711 *
2712 * Whenever a remote port is allocated, a new fc_remote_port class
2713 * device is created.
2714 *
2715 * Should not be called from interrupt context.
2716 *
2717 * Notes:
2718 * This routine assumes no locks are held on entry.
2719 */
2720 struct fc_rport *
2721 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2722 struct fc_rport_identifiers *ids)
2723 {
2724 struct fc_internal *fci = to_fc_internal(shost->transportt);
2725 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2726 struct fc_rport *rport;
2727 unsigned long flags;
2728 int match = 0;
2729
2730 /* ensure any stgt delete functions are done */
2731 fc_flush_work(shost);
2732
2733 /*
2734 * Search the list of "active" rports, for an rport that has been
2735 * deleted, but we've held off the real delete while the target
2736 * is in a "blocked" state.
2737 */
2738 spin_lock_irqsave(shost->host_lock, flags);
2739
2740 list_for_each_entry(rport, &fc_host->rports, peers) {
2741
2742 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2743 (rport->channel == channel)) {
2744
2745 switch (fc_host->tgtid_bind_type) {
2746 case FC_TGTID_BIND_BY_WWPN:
2747 case FC_TGTID_BIND_NONE:
2748 if (rport->port_name == ids->port_name)
2749 match = 1;
2750 break;
2751 case FC_TGTID_BIND_BY_WWNN:
2752 if (rport->node_name == ids->node_name)
2753 match = 1;
2754 break;
2755 case FC_TGTID_BIND_BY_ID:
2756 if (rport->port_id == ids->port_id)
2757 match = 1;
2758 break;
2759 }
2760
2761 if (match) {
2762
2763 memcpy(&rport->node_name, &ids->node_name,
2764 sizeof(rport->node_name));
2765 memcpy(&rport->port_name, &ids->port_name,
2766 sizeof(rport->port_name));
2767 rport->port_id = ids->port_id;
2768
2769 rport->port_state = FC_PORTSTATE_ONLINE;
2770 rport->roles = ids->roles;
2771
2772 spin_unlock_irqrestore(shost->host_lock, flags);
2773
2774 if (fci->f->dd_fcrport_size)
2775 memset(rport->dd_data, 0,
2776 fci->f->dd_fcrport_size);
2777
2778 /*
2779 * If we were not a target, cancel the
2780 * io terminate and rport timers, and
2781 * we're done.
2782 *
2783 * If we were a target, but our new role
2784 * doesn't indicate a target, leave the
2785 * timers running expecting the role to
2786 * change as the target fully logs in. If
2787 * it doesn't, the target will be torn down.
2788 *
2789 * If we were a target, and our role shows
2790 * we're still a target, cancel the timers
2791 * and kick off a scan.
2792 */
2793
2794 /* was a target, not in roles */
2795 if ((rport->scsi_target_id != -1) &&
2796 (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2797 return rport;
2798
2799 /*
2800 * Stop the fail io and dev_loss timers.
2801 * If they flush, the port_state will
2802 * be checked and will NOOP the function.
2803 */
2804 if (!cancel_delayed_work(&rport->fail_io_work))
2805 fc_flush_devloss(shost);
2806 if (!cancel_delayed_work(&rport->dev_loss_work))
2807 fc_flush_devloss(shost);
2808
2809 spin_lock_irqsave(shost->host_lock, flags);
2810
2811 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2812 FC_RPORT_DEVLOSS_PENDING |
2813 FC_RPORT_DEVLOSS_CALLBK_DONE);
2814
2815 spin_unlock_irqrestore(shost->host_lock, flags);
2816
2817 /* if target, initiate a scan */
2818 if (rport->scsi_target_id != -1) {
2819 scsi_target_unblock(&rport->dev,
2820 SDEV_RUNNING);
2821 spin_lock_irqsave(shost->host_lock,
2822 flags);
2823 rport->flags |= FC_RPORT_SCAN_PENDING;
2824 scsi_queue_work(shost,
2825 &rport->scan_work);
2826 spin_unlock_irqrestore(shost->host_lock,
2827 flags);
2828 }
2829
2830 fc_bsg_goose_queue(rport);
2831
2832 return rport;
2833 }
2834 }
2835 }
2836
2837 /*
2838 * Search the bindings array
2839 * Note: if never a FCP target, you won't be on this list
2840 */
2841 if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2842
2843 /* search for a matching consistent binding */
2844
2845 list_for_each_entry(rport, &fc_host->rport_bindings,
2846 peers) {
2847 if (rport->channel != channel)
2848 continue;
2849
2850 switch (fc_host->tgtid_bind_type) {
2851 case FC_TGTID_BIND_BY_WWPN:
2852 if (rport->port_name == ids->port_name)
2853 match = 1;
2854 break;
2855 case FC_TGTID_BIND_BY_WWNN:
2856 if (rport->node_name == ids->node_name)
2857 match = 1;
2858 break;
2859 case FC_TGTID_BIND_BY_ID:
2860 if (rport->port_id == ids->port_id)
2861 match = 1;
2862 break;
2863 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2864 break;
2865 }
2866
2867 if (match) {
2868 list_move_tail(&rport->peers, &fc_host->rports);
2869 break;
2870 }
2871 }
2872
2873 if (match) {
2874 memcpy(&rport->node_name, &ids->node_name,
2875 sizeof(rport->node_name));
2876 memcpy(&rport->port_name, &ids->port_name,
2877 sizeof(rport->port_name));
2878 rport->port_id = ids->port_id;
2879 rport->roles = ids->roles;
2880 rport->port_state = FC_PORTSTATE_ONLINE;
2881 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2882
2883 if (fci->f->dd_fcrport_size)
2884 memset(rport->dd_data, 0,
2885 fci->f->dd_fcrport_size);
2886 spin_unlock_irqrestore(shost->host_lock, flags);
2887
2888 if (ids->roles & FC_PORT_ROLE_FCP_TARGET) {
2889 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
2890
2891 /* initiate a scan of the target */
2892 spin_lock_irqsave(shost->host_lock, flags);
2893 rport->flags |= FC_RPORT_SCAN_PENDING;
2894 scsi_queue_work(shost, &rport->scan_work);
2895 spin_unlock_irqrestore(shost->host_lock, flags);
2896 }
2897 return rport;
2898 }
2899 }
2900
2901 spin_unlock_irqrestore(shost->host_lock, flags);
2902
2903 /* No consistent binding found - create new remote port entry */
2904 rport = fc_remote_port_create(shost, channel, ids);
2905
2906 return rport;
2907 }
2908 EXPORT_SYMBOL(fc_remote_port_add);
2909
2910
2911 /**
2912 * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2913 * @rport: The remote port that no longer exists
2914 *
2915 * The LLDD calls this routine to notify the transport that a remote
2916 * port is no longer part of the topology. Note: Although a port
2917 * may no longer be part of the topology, it may persist in the remote
2918 * ports displayed by the fc_host. We do this under 2 conditions:
2919 *
2920 * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2921 * This allows the port to temporarily disappear, then reappear without
2922 * disrupting the SCSI device tree attached to it. During the "blocked"
2923 * period the port will still exist.
2924 *
2925 * 2) If the port was a scsi target and disappears for longer than we
2926 * expect, we'll delete the port and the tear down the SCSI device tree
2927 * attached to it. However, we want to semi-persist the target id assigned
2928 * to that port if it eventually does exist. The port structure will
2929 * remain (although with minimal information) so that the target id
2930 * bindings also remain.
2931 *
2932 * If the remote port is not an FCP Target, it will be fully torn down
2933 * and deallocated, including the fc_remote_port class device.
2934 *
2935 * If the remote port is an FCP Target, the port will be placed in a
2936 * temporary blocked state. From the LLDD's perspective, the rport no
2937 * longer exists. From the SCSI midlayer's perspective, the SCSI target
2938 * exists, but all sdevs on it are blocked from further I/O. The following
2939 * is then expected.
2940 *
2941 * If the remote port does not return (signaled by a LLDD call to
2942 * fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2943 * scsi target is removed - killing all outstanding i/o and removing the
2944 * scsi devices attached to it. The port structure will be marked Not
2945 * Present and be partially cleared, leaving only enough information to
2946 * recognize the remote port relative to the scsi target id binding if
2947 * it later appears. The port will remain as long as there is a valid
2948 * binding (e.g. until the user changes the binding type or unloads the
2949 * scsi host with the binding).
2950 *
2951 * If the remote port returns within the dev_loss_tmo value (and matches
2952 * according to the target id binding type), the port structure will be
2953 * reused. If it is no longer a SCSI target, the target will be torn
2954 * down. If it continues to be a SCSI target, then the target will be
2955 * unblocked (allowing i/o to be resumed), and a scan will be activated
2956 * to ensure that all luns are detected.
2957 *
2958 * Called from normal process context only - cannot be called from interrupt.
2959 *
2960 * Notes:
2961 * This routine assumes no locks are held on entry.
2962 */
2963 void
2964 fc_remote_port_delete(struct fc_rport *rport)
2965 {
2966 struct Scsi_Host *shost = rport_to_shost(rport);
2967 unsigned long timeout = rport->dev_loss_tmo;
2968 unsigned long flags;
2969
2970 /*
2971 * No need to flush the fc_host work_q's, as all adds are synchronous.
2972 *
2973 * We do need to reclaim the rport scan work element, so eventually
2974 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2975 * there's still a scan pending.
2976 */
2977
2978 spin_lock_irqsave(shost->host_lock, flags);
2979
2980 if (rport->port_state != FC_PORTSTATE_ONLINE) {
2981 spin_unlock_irqrestore(shost->host_lock, flags);
2982 return;
2983 }
2984
2985 /*
2986 * In the past, we if this was not an FCP-Target, we would
2987 * unconditionally just jump to deleting the rport.
2988 * However, rports can be used as node containers by the LLDD,
2989 * and its not appropriate to just terminate the rport at the
2990 * first sign of a loss in connectivity. The LLDD may want to
2991 * send ELS traffic to re-validate the login. If the rport is
2992 * immediately deleted, it makes it inappropriate for a node
2993 * container.
2994 * So... we now unconditionally wait dev_loss_tmo before
2995 * destroying an rport.
2996 */
2997
2998 rport->port_state = FC_PORTSTATE_BLOCKED;
2999
3000 rport->flags |= FC_RPORT_DEVLOSS_PENDING;
3001
3002 spin_unlock_irqrestore(shost->host_lock, flags);
3003
3004 scsi_target_block(&rport->dev);
3005
3006 /* see if we need to kill io faster than waiting for device loss */
3007 if ((rport->fast_io_fail_tmo != -1) &&
3008 (rport->fast_io_fail_tmo < timeout))
3009 fc_queue_devloss_work(shost, &rport->fail_io_work,
3010 rport->fast_io_fail_tmo * HZ);
3011
3012 /* cap the length the devices can be blocked until they are deleted */
3013 fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
3014 }
3015 EXPORT_SYMBOL(fc_remote_port_delete);
3016
3017 /**
3018 * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
3019 * @rport: The remote port that changed.
3020 * @roles: New roles for this port.
3021 *
3022 * Description: The LLDD calls this routine to notify the transport that the
3023 * roles on a remote port may have changed. The largest effect of this is
3024 * if a port now becomes a FCP Target, it must be allocated a
3025 * scsi target id. If the port is no longer a FCP target, any
3026 * scsi target id value assigned to it will persist in case the
3027 * role changes back to include FCP Target. No changes in the scsi
3028 * midlayer will be invoked if the role changes (in the expectation
3029 * that the role will be resumed. If it doesn't normal error processing
3030 * will take place).
3031 *
3032 * Should not be called from interrupt context.
3033 *
3034 * Notes:
3035 * This routine assumes no locks are held on entry.
3036 */
3037 void
3038 fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
3039 {
3040 struct Scsi_Host *shost = rport_to_shost(rport);
3041 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3042 unsigned long flags;
3043 int create = 0;
3044
3045 spin_lock_irqsave(shost->host_lock, flags);
3046 if (roles & FC_PORT_ROLE_FCP_TARGET) {
3047 if (rport->scsi_target_id == -1) {
3048 rport->scsi_target_id = fc_host->next_target_id++;
3049 create = 1;
3050 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3051 create = 1;
3052 }
3053
3054 rport->roles = roles;
3055
3056 spin_unlock_irqrestore(shost->host_lock, flags);
3057
3058 if (create) {
3059 /*
3060 * There may have been a delete timer running on the
3061 * port. Ensure that it is cancelled as we now know
3062 * the port is an FCP Target.
3063 * Note: we know the rport exists and is in an online
3064 * state as the LLDD would not have had an rport
3065 * reference to pass us.
3066 *
3067 * Take no action on the del_timer failure as the state
3068 * machine state change will validate the
3069 * transaction.
3070 */
3071 if (!cancel_delayed_work(&rport->fail_io_work))
3072 fc_flush_devloss(shost);
3073 if (!cancel_delayed_work(&rport->dev_loss_work))
3074 fc_flush_devloss(shost);
3075
3076 spin_lock_irqsave(shost->host_lock, flags);
3077 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3078 FC_RPORT_DEVLOSS_PENDING |
3079 FC_RPORT_DEVLOSS_CALLBK_DONE);
3080 spin_unlock_irqrestore(shost->host_lock, flags);
3081
3082 /* ensure any stgt delete functions are done */
3083 fc_flush_work(shost);
3084
3085 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
3086 /* initiate a scan of the target */
3087 spin_lock_irqsave(shost->host_lock, flags);
3088 rport->flags |= FC_RPORT_SCAN_PENDING;
3089 scsi_queue_work(shost, &rport->scan_work);
3090 spin_unlock_irqrestore(shost->host_lock, flags);
3091 }
3092 }
3093 EXPORT_SYMBOL(fc_remote_port_rolechg);
3094
3095 /**
3096 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3097 * @work: rport target that failed to reappear in the allotted time.
3098 *
3099 * Description: An attempt to delete a remote port blocks, and if it fails
3100 * to return in the allotted time this gets called.
3101 */
3102 static void
3103 fc_timeout_deleted_rport(struct work_struct *work)
3104 {
3105 struct fc_rport *rport =
3106 container_of(work, struct fc_rport, dev_loss_work.work);
3107 struct Scsi_Host *shost = rport_to_shost(rport);
3108 struct fc_internal *i = to_fc_internal(shost->transportt);
3109 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3110 unsigned long flags;
3111 int do_callback = 0;
3112
3113 spin_lock_irqsave(shost->host_lock, flags);
3114
3115 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3116
3117 /*
3118 * If the port is ONLINE, then it came back. If it was a SCSI
3119 * target, validate it still is. If not, tear down the
3120 * scsi_target on it.
3121 */
3122 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3123 (rport->scsi_target_id != -1) &&
3124 !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3125 dev_printk(KERN_ERR, &rport->dev,
3126 "blocked FC remote port time out: no longer"
3127 " a FCP target, removing starget\n");
3128 spin_unlock_irqrestore(shost->host_lock, flags);
3129 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
3130 fc_queue_work(shost, &rport->stgt_delete_work);
3131 return;
3132 }
3133
3134 /* NOOP state - we're flushing workq's */
3135 if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3136 spin_unlock_irqrestore(shost->host_lock, flags);
3137 dev_printk(KERN_ERR, &rport->dev,
3138 "blocked FC remote port time out: leaving"
3139 " rport%s alone\n",
3140 (rport->scsi_target_id != -1) ? " and starget" : "");
3141 return;
3142 }
3143
3144 if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3145 (rport->scsi_target_id == -1)) {
3146 list_del(&rport->peers);
3147 rport->port_state = FC_PORTSTATE_DELETED;
3148 dev_printk(KERN_ERR, &rport->dev,
3149 "blocked FC remote port time out: removing"
3150 " rport%s\n",
3151 (rport->scsi_target_id != -1) ? " and starget" : "");
3152 fc_queue_work(shost, &rport->rport_delete_work);
3153 spin_unlock_irqrestore(shost->host_lock, flags);
3154 return;
3155 }
3156
3157 dev_printk(KERN_ERR, &rport->dev,
3158 "blocked FC remote port time out: removing target and "
3159 "saving binding\n");
3160
3161 list_move_tail(&rport->peers, &fc_host->rport_bindings);
3162
3163 /*
3164 * Note: We do not remove or clear the hostdata area. This allows
3165 * host-specific target data to persist along with the
3166 * scsi_target_id. It's up to the host to manage it's hostdata area.
3167 */
3168
3169 /*
3170 * Reinitialize port attributes that may change if the port comes back.
3171 */
3172 rport->maxframe_size = -1;
3173 rport->supported_classes = FC_COS_UNSPECIFIED;
3174 rport->roles = FC_PORT_ROLE_UNKNOWN;
3175 rport->port_state = FC_PORTSTATE_NOTPRESENT;
3176 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3177
3178 /*
3179 * Pre-emptively kill I/O rather than waiting for the work queue
3180 * item to teardown the starget. (FCOE libFC folks prefer this
3181 * and to have the rport_port_id still set when it's done).
3182 */
3183 spin_unlock_irqrestore(shost->host_lock, flags);
3184 fc_terminate_rport_io(rport);
3185
3186 spin_lock_irqsave(shost->host_lock, flags);
3187
3188 if (rport->port_state == FC_PORTSTATE_NOTPRESENT) { /* still missing */
3189
3190 /* remove the identifiers that aren't used in the consisting binding */
3191 switch (fc_host->tgtid_bind_type) {
3192 case FC_TGTID_BIND_BY_WWPN:
3193 rport->node_name = -1;
3194 rport->port_id = -1;
3195 break;
3196 case FC_TGTID_BIND_BY_WWNN:
3197 rport->port_name = -1;
3198 rport->port_id = -1;
3199 break;
3200 case FC_TGTID_BIND_BY_ID:
3201 rport->node_name = -1;
3202 rport->port_name = -1;
3203 break;
3204 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3205 break;
3206 }
3207
3208 /*
3209 * As this only occurs if the remote port (scsi target)
3210 * went away and didn't come back - we'll remove
3211 * all attached scsi devices.
3212 */
3213 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3214 fc_queue_work(shost, &rport->stgt_delete_work);
3215
3216 do_callback = 1;
3217 }
3218
3219 spin_unlock_irqrestore(shost->host_lock, flags);
3220
3221 /*
3222 * Notify the driver that the rport is now dead. The LLDD will
3223 * also guarantee that any communication to the rport is terminated
3224 *
3225 * Note: we set the CALLBK_DONE flag above to correspond
3226 */
3227 if (do_callback && i->f->dev_loss_tmo_callbk)
3228 i->f->dev_loss_tmo_callbk(rport);
3229 }
3230
3231
3232 /**
3233 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3234 * @work: rport to terminate io on.
3235 *
3236 * Notes: Only requests the failure of the io, not that all are flushed
3237 * prior to returning.
3238 */
3239 static void
3240 fc_timeout_fail_rport_io(struct work_struct *work)
3241 {
3242 struct fc_rport *rport =
3243 container_of(work, struct fc_rport, fail_io_work.work);
3244
3245 if (rport->port_state != FC_PORTSTATE_BLOCKED)
3246 return;
3247
3248 rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3249 fc_terminate_rport_io(rport);
3250 }
3251
3252 /**
3253 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3254 * @work: remote port to be scanned.
3255 */
3256 static void
3257 fc_scsi_scan_rport(struct work_struct *work)
3258 {
3259 struct fc_rport *rport =
3260 container_of(work, struct fc_rport, scan_work);
3261 struct Scsi_Host *shost = rport_to_shost(rport);
3262 struct fc_internal *i = to_fc_internal(shost->transportt);
3263 unsigned long flags;
3264
3265 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3266 (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3267 !(i->f->disable_target_scan)) {
3268 scsi_scan_target(&rport->dev, rport->channel,
3269 rport->scsi_target_id, SCAN_WILD_CARD,
3270 SCSI_SCAN_RESCAN);
3271 }
3272
3273 spin_lock_irqsave(shost->host_lock, flags);
3274 rport->flags &= ~FC_RPORT_SCAN_PENDING;
3275 spin_unlock_irqrestore(shost->host_lock, flags);
3276 }
3277
3278 /**
3279 * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3280 * @cmnd: SCSI command that scsi_eh is trying to recover
3281 *
3282 * This routine can be called from a FC LLD scsi_eh callback. It
3283 * blocks the scsi_eh thread until the fc_rport leaves the
3284 * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3285 * necessary to avoid the scsi_eh failing recovery actions for blocked
3286 * rports which would lead to offlined SCSI devices.
3287 *
3288 * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3289 * FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3290 * passed back to scsi_eh.
3291 */
3292 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3293 {
3294 struct Scsi_Host *shost = cmnd->device->host;
3295 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3296 unsigned long flags;
3297
3298 spin_lock_irqsave(shost->host_lock, flags);
3299 while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3300 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3301 spin_unlock_irqrestore(shost->host_lock, flags);
3302 msleep(1000);
3303 spin_lock_irqsave(shost->host_lock, flags);
3304 }
3305 spin_unlock_irqrestore(shost->host_lock, flags);
3306
3307 if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3308 return FAST_IO_FAIL;
3309
3310 return 0;
3311 }
3312 EXPORT_SYMBOL(fc_block_scsi_eh);
3313
3314 /**
3315 * fc_vport_setup - allocates and creates a FC virtual port.
3316 * @shost: scsi host the virtual port is connected to.
3317 * @channel: Channel on shost port connected to.
3318 * @pdev: parent device for vport
3319 * @ids: The world wide names, FC4 port roles, etc for
3320 * the virtual port.
3321 * @ret_vport: The pointer to the created vport.
3322 *
3323 * Allocates and creates the vport structure, calls the parent host
3324 * to instantiate the vport, this completes w/ class and sysfs creation.
3325 *
3326 * Notes:
3327 * This routine assumes no locks are held on entry.
3328 */
3329 static int
3330 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3331 struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
3332 {
3333 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3334 struct fc_internal *fci = to_fc_internal(shost->transportt);
3335 struct fc_vport *vport;
3336 struct device *dev;
3337 unsigned long flags;
3338 size_t size;
3339 int error;
3340
3341 *ret_vport = NULL;
3342
3343 if ( ! fci->f->vport_create)
3344 return -ENOENT;
3345
3346 size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3347 vport = kzalloc(size, GFP_KERNEL);
3348 if (unlikely(!vport)) {
3349 printk(KERN_ERR "%s: allocation failure\n", __func__);
3350 return -ENOMEM;
3351 }
3352
3353 vport->vport_state = FC_VPORT_UNKNOWN;
3354 vport->vport_last_state = FC_VPORT_UNKNOWN;
3355 vport->node_name = ids->node_name;
3356 vport->port_name = ids->port_name;
3357 vport->roles = ids->roles;
3358 vport->vport_type = ids->vport_type;
3359 if (fci->f->dd_fcvport_size)
3360 vport->dd_data = &vport[1];
3361 vport->shost = shost;
3362 vport->channel = channel;
3363 vport->flags = FC_VPORT_CREATING;
3364 INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3365
3366 spin_lock_irqsave(shost->host_lock, flags);
3367
3368 if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3369 spin_unlock_irqrestore(shost->host_lock, flags);
3370 kfree(vport);
3371 return -ENOSPC;
3372 }
3373 fc_host->npiv_vports_inuse++;
3374 vport->number = fc_host->next_vport_number++;
3375 list_add_tail(&vport->peers, &fc_host->vports);
3376 scsi_host_get(shost); /* for fc_host->vport list */
3377
3378 spin_unlock_irqrestore(shost->host_lock, flags);
3379
3380 dev = &vport->dev;
3381 device_initialize(dev); /* takes self reference */
3382 dev->parent = get_device(pdev); /* takes parent reference */
3383 dev->release = fc_vport_dev_release;
3384 dev_set_name(dev, "vport-%d:%d-%d",
3385 shost->host_no, channel, vport->number);
3386 transport_setup_device(dev);
3387
3388 error = device_add(dev);
3389 if (error) {
3390 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3391 goto delete_vport;
3392 }
3393 transport_add_device(dev);
3394 transport_configure_device(dev);
3395
3396 error = fci->f->vport_create(vport, ids->disable);
3397 if (error) {
3398 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3399 goto delete_vport_all;
3400 }
3401
3402 /*
3403 * if the parent isn't the physical adapter's Scsi_Host, ensure
3404 * the Scsi_Host at least contains a symlink to the vport.
3405 */
3406 if (pdev != &shost->shost_gendev) {
3407 error = sysfs_create_link(&shost->shost_gendev.kobj,
3408 &dev->kobj, dev_name(dev));
3409 if (error)
3410 printk(KERN_ERR
3411 "%s: Cannot create vport symlinks for "
3412 "%s, err=%d\n",
3413 __func__, dev_name(dev), error);
3414 }
3415 spin_lock_irqsave(shost->host_lock, flags);
3416 vport->flags &= ~FC_VPORT_CREATING;
3417 spin_unlock_irqrestore(shost->host_lock, flags);
3418
3419 dev_printk(KERN_NOTICE, pdev,
3420 "%s created via shost%d channel %d\n", dev_name(dev),
3421 shost->host_no, channel);
3422
3423 *ret_vport = vport;
3424
3425 return 0;
3426
3427 delete_vport_all:
3428 transport_remove_device(dev);
3429 device_del(dev);
3430 delete_vport:
3431 transport_destroy_device(dev);
3432 spin_lock_irqsave(shost->host_lock, flags);
3433 list_del(&vport->peers);
3434 scsi_host_put(shost); /* for fc_host->vport list */
3435 fc_host->npiv_vports_inuse--;
3436 spin_unlock_irqrestore(shost->host_lock, flags);
3437 put_device(dev->parent);
3438 kfree(vport);
3439
3440 return error;
3441 }
3442
3443 /**
3444 * fc_vport_create - Admin App or LLDD requests creation of a vport
3445 * @shost: scsi host the virtual port is connected to.
3446 * @channel: channel on shost port connected to.
3447 * @ids: The world wide names, FC4 port roles, etc for
3448 * the virtual port.
3449 *
3450 * Notes:
3451 * This routine assumes no locks are held on entry.
3452 */
3453 struct fc_vport *
3454 fc_vport_create(struct Scsi_Host *shost, int channel,
3455 struct fc_vport_identifiers *ids)
3456 {
3457 int stat;
3458 struct fc_vport *vport;
3459
3460 stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3461 ids, &vport);
3462 return stat ? NULL : vport;
3463 }
3464 EXPORT_SYMBOL(fc_vport_create);
3465
3466 /**
3467 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3468 * @vport: fc_vport to be terminated
3469 *
3470 * Calls the LLDD vport_delete() function, then deallocates and removes
3471 * the vport from the shost and object tree.
3472 *
3473 * Notes:
3474 * This routine assumes no locks are held on entry.
3475 */
3476 int
3477 fc_vport_terminate(struct fc_vport *vport)
3478 {
3479 struct Scsi_Host *shost = vport_to_shost(vport);
3480 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3481 struct fc_internal *i = to_fc_internal(shost->transportt);
3482 struct device *dev = &vport->dev;
3483 unsigned long flags;
3484 int stat;
3485
3486 if (i->f->vport_delete)
3487 stat = i->f->vport_delete(vport);
3488 else
3489 stat = -ENOENT;
3490
3491 spin_lock_irqsave(shost->host_lock, flags);
3492 vport->flags &= ~FC_VPORT_DELETING;
3493 if (!stat) {
3494 vport->flags |= FC_VPORT_DELETED;
3495 list_del(&vport->peers);
3496 fc_host->npiv_vports_inuse--;
3497 scsi_host_put(shost); /* for fc_host->vport list */
3498 }
3499 spin_unlock_irqrestore(shost->host_lock, flags);
3500
3501 if (stat)
3502 return stat;
3503
3504 if (dev->parent != &shost->shost_gendev)
3505 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3506 transport_remove_device(dev);
3507 device_del(dev);
3508 transport_destroy_device(dev);
3509
3510 /*
3511 * Removing our self-reference should mean our
3512 * release function gets called, which will drop the remaining
3513 * parent reference and free the data structure.
3514 */
3515 put_device(dev); /* for self-reference */
3516
3517 return 0; /* SUCCESS */
3518 }
3519 EXPORT_SYMBOL(fc_vport_terminate);
3520
3521 /**
3522 * fc_vport_sched_delete - workq-based delete request for a vport
3523 * @work: vport to be deleted.
3524 */
3525 static void
3526 fc_vport_sched_delete(struct work_struct *work)
3527 {
3528 struct fc_vport *vport =
3529 container_of(work, struct fc_vport, vport_delete_work);
3530 int stat;
3531
3532 stat = fc_vport_terminate(vport);
3533 if (stat)
3534 dev_printk(KERN_ERR, vport->dev.parent,
3535 "%s: %s could not be deleted created via "
3536 "shost%d channel %d - error %d\n", __func__,
3537 dev_name(&vport->dev), vport->shost->host_no,
3538 vport->channel, stat);
3539 }
3540
3541
3542 /*
3543 * BSG support
3544 */
3545
3546 /**
3547 * fc_bsg_job_timeout - handler for when a bsg request timesout
3548 * @req: request that timed out
3549 */
3550 static enum blk_eh_timer_return
3551 fc_bsg_job_timeout(struct request *req)
3552 {
3553 struct bsg_job *job = blk_mq_rq_to_pdu(req);
3554 struct Scsi_Host *shost = fc_bsg_to_shost(job);
3555 struct fc_rport *rport = fc_bsg_to_rport(job);
3556 struct fc_internal *i = to_fc_internal(shost->transportt);
3557 int err = 0, inflight = 0;
3558
3559 if (rport && rport->port_state == FC_PORTSTATE_BLOCKED)
3560 return BLK_EH_RESET_TIMER;
3561
3562 inflight = bsg_job_get(job);
3563
3564 if (inflight && i->f->bsg_timeout) {
3565 /* call LLDD to abort the i/o as it has timed out */
3566 err = i->f->bsg_timeout(job);
3567 if (err == -EAGAIN) {
3568 bsg_job_put(job);
3569 return BLK_EH_RESET_TIMER;
3570 } else if (err)
3571 printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3572 "abort failed with status %d\n", err);
3573 }
3574
3575 /* the blk_end_sync_io() doesn't check the error */
3576 if (!inflight)
3577 return BLK_EH_NOT_HANDLED;
3578 else
3579 return BLK_EH_HANDLED;
3580 }
3581
3582 /**
3583 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3584 * @shost: scsi host rport attached to
3585 * @job: bsg job to be processed
3586 */
3587 static int fc_bsg_host_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
3588 {
3589 struct fc_internal *i = to_fc_internal(shost->transportt);
3590 struct fc_bsg_request *bsg_request = job->request;
3591 struct fc_bsg_reply *bsg_reply = job->reply;
3592 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3593 int ret;
3594
3595 /* check if we really have all the request data needed */
3596 if (job->request_len < cmdlen) {
3597 ret = -ENOMSG;
3598 goto fail_host_msg;
3599 }
3600
3601 /* Validate the host command */
3602 switch (bsg_request->msgcode) {
3603 case FC_BSG_HST_ADD_RPORT:
3604 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3605 break;
3606
3607 case FC_BSG_HST_DEL_RPORT:
3608 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3609 break;
3610
3611 case FC_BSG_HST_ELS_NOLOGIN:
3612 cmdlen += sizeof(struct fc_bsg_host_els);
3613 /* there better be a xmt and rcv payloads */
3614 if ((!job->request_payload.payload_len) ||
3615 (!job->reply_payload.payload_len)) {
3616 ret = -EINVAL;
3617 goto fail_host_msg;
3618 }
3619 break;
3620
3621 case FC_BSG_HST_CT:
3622 cmdlen += sizeof(struct fc_bsg_host_ct);
3623 /* there better be xmt and rcv payloads */
3624 if ((!job->request_payload.payload_len) ||
3625 (!job->reply_payload.payload_len)) {
3626 ret = -EINVAL;
3627 goto fail_host_msg;
3628 }
3629 break;
3630
3631 case FC_BSG_HST_VENDOR:
3632 cmdlen += sizeof(struct fc_bsg_host_vendor);
3633 if ((shost->hostt->vendor_id == 0L) ||
3634 (bsg_request->rqst_data.h_vendor.vendor_id !=
3635 shost->hostt->vendor_id)) {
3636 ret = -ESRCH;
3637 goto fail_host_msg;
3638 }
3639 break;
3640
3641 default:
3642 ret = -EBADR;
3643 goto fail_host_msg;
3644 }
3645
3646 ret = i->f->bsg_request(job);
3647 if (!ret)
3648 return 0;
3649
3650 fail_host_msg:
3651 /* return the errno failure code as the only status */
3652 BUG_ON(job->reply_len < sizeof(uint32_t));
3653 bsg_reply->reply_payload_rcv_len = 0;
3654 bsg_reply->result = ret;
3655 job->reply_len = sizeof(uint32_t);
3656 bsg_job_done(job, bsg_reply->result,
3657 bsg_reply->reply_payload_rcv_len);
3658 return 0;
3659 }
3660
3661
3662 /*
3663 * fc_bsg_goose_queue - restart rport queue in case it was stopped
3664 * @rport: rport to be restarted
3665 */
3666 static void
3667 fc_bsg_goose_queue(struct fc_rport *rport)
3668 {
3669 struct request_queue *q = rport->rqst_q;
3670 unsigned long flags;
3671
3672 if (!q)
3673 return;
3674
3675 spin_lock_irqsave(q->queue_lock, flags);
3676 blk_run_queue_async(q);
3677 spin_unlock_irqrestore(q->queue_lock, flags);
3678 }
3679
3680 /**
3681 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3682 * @shost: scsi host rport attached to
3683 * @job: bsg job to be processed
3684 */
3685 static int fc_bsg_rport_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
3686 {
3687 struct fc_internal *i = to_fc_internal(shost->transportt);
3688 struct fc_bsg_request *bsg_request = job->request;
3689 struct fc_bsg_reply *bsg_reply = job->reply;
3690 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3691 int ret;
3692
3693 /* check if we really have all the request data needed */
3694 if (job->request_len < cmdlen) {
3695 ret = -ENOMSG;
3696 goto fail_rport_msg;
3697 }
3698
3699 /* Validate the rport command */
3700 switch (bsg_request->msgcode) {
3701 case FC_BSG_RPT_ELS:
3702 cmdlen += sizeof(struct fc_bsg_rport_els);
3703 goto check_bidi;
3704
3705 case FC_BSG_RPT_CT:
3706 cmdlen += sizeof(struct fc_bsg_rport_ct);
3707 check_bidi:
3708 /* there better be xmt and rcv payloads */
3709 if ((!job->request_payload.payload_len) ||
3710 (!job->reply_payload.payload_len)) {
3711 ret = -EINVAL;
3712 goto fail_rport_msg;
3713 }
3714 break;
3715 default:
3716 ret = -EBADR;
3717 goto fail_rport_msg;
3718 }
3719
3720 ret = i->f->bsg_request(job);
3721 if (!ret)
3722 return 0;
3723
3724 fail_rport_msg:
3725 /* return the errno failure code as the only status */
3726 BUG_ON(job->reply_len < sizeof(uint32_t));
3727 bsg_reply->reply_payload_rcv_len = 0;
3728 bsg_reply->result = ret;
3729 job->reply_len = sizeof(uint32_t);
3730 bsg_job_done(job, bsg_reply->result,
3731 bsg_reply->reply_payload_rcv_len);
3732 return 0;
3733 }
3734
3735 static int fc_bsg_dispatch(struct bsg_job *job)
3736 {
3737 struct Scsi_Host *shost = fc_bsg_to_shost(job);
3738
3739 if (scsi_is_fc_rport(job->dev))
3740 return fc_bsg_rport_dispatch(shost, job);
3741 else
3742 return fc_bsg_host_dispatch(shost, job);
3743 }
3744
3745 /**
3746 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
3747 * @shost: shost for fc_host
3748 * @fc_host: fc_host adding the structures to
3749 */
3750 static int
3751 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
3752 {
3753 struct device *dev = &shost->shost_gendev;
3754 struct fc_internal *i = to_fc_internal(shost->transportt);
3755 struct request_queue *q;
3756 char bsg_name[20];
3757
3758 fc_host->rqst_q = NULL;
3759
3760 if (!i->f->bsg_request)
3761 return -ENOTSUPP;
3762
3763 snprintf(bsg_name, sizeof(bsg_name),
3764 "fc_host%d", shost->host_no);
3765
3766 q = bsg_setup_queue(dev, bsg_name, fc_bsg_dispatch, i->f->dd_bsg_size);
3767 if (IS_ERR(q)) {
3768 dev_err(dev,
3769 "fc_host%d: bsg interface failed to initialize - setup queue\n",
3770 shost->host_no);
3771 return PTR_ERR(q);
3772 }
3773 __scsi_init_queue(shost, q);
3774 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3775 blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
3776 fc_host->rqst_q = q;
3777 return 0;
3778 }
3779
3780 static int fc_bsg_rport_prep(struct request_queue *q, struct request *req)
3781 {
3782 struct fc_rport *rport = dev_to_rport(q->queuedata);
3783
3784 if (rport->port_state == FC_PORTSTATE_BLOCKED &&
3785 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3786 return BLKPREP_DEFER;
3787
3788 if (rport->port_state != FC_PORTSTATE_ONLINE)
3789 return BLKPREP_KILL;
3790
3791 return BLKPREP_OK;
3792 }
3793
3794 /**
3795 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
3796 * @shost: shost that rport is attached to
3797 * @rport: rport that the bsg hooks are being attached to
3798 */
3799 static int
3800 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
3801 {
3802 struct device *dev = &rport->dev;
3803 struct fc_internal *i = to_fc_internal(shost->transportt);
3804 struct request_queue *q;
3805
3806 rport->rqst_q = NULL;
3807
3808 if (!i->f->bsg_request)
3809 return -ENOTSUPP;
3810
3811 q = bsg_setup_queue(dev, NULL, fc_bsg_dispatch, i->f->dd_bsg_size);
3812 if (IS_ERR(q)) {
3813 dev_err(dev, "failed to setup bsg queue\n");
3814 return PTR_ERR(q);
3815 }
3816 __scsi_init_queue(shost, q);
3817 blk_queue_prep_rq(q, fc_bsg_rport_prep);
3818 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3819 blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
3820 rport->rqst_q = q;
3821 return 0;
3822 }
3823
3824
3825 /**
3826 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
3827 * @q: the request_queue that is to be torn down.
3828 *
3829 * Notes:
3830 * Before unregistering the queue empty any requests that are blocked
3831 *
3832 *
3833 */
3834 static void
3835 fc_bsg_remove(struct request_queue *q)
3836 {
3837 if (q) {
3838 bsg_unregister_queue(q);
3839 blk_cleanup_queue(q);
3840 }
3841 }
3842
3843
3844 /* Original Author: Martin Hicks */
3845 MODULE_AUTHOR("James Smart");
3846 MODULE_DESCRIPTION("FC Transport Attributes");
3847 MODULE_LICENSE("GPL");
3848
3849 module_init(fc_transport_init);
3850 module_exit(fc_transport_exit);
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