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Merge tag 'stable/for-linus-3.16-rc5-tag' of git://git.kernel.org/pub/scm/linux/kerne...
[deliverable/linux.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 <scsi/scsi_device.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi_transport.h>
36 #include <scsi/scsi_transport_fc.h>
37 #include <scsi/scsi_cmnd.h>
38 #include <net/netlink.h>
39 #include <scsi/scsi_netlink_fc.h>
40 #include <scsi/scsi_bsg_fc.h>
41 #include "scsi_priv.h"
42 #include "scsi_transport_fc_internal.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_NOT_NEGOTIATED, "Not Negotiated" },
266 };
267 fc_bitfield_name_search(port_speed, fc_port_speed_names)
268
269
270 static int
271 show_fc_fc4s (char *buf, u8 *fc4_list)
272 {
273 int i, len=0;
274
275 for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
276 len += sprintf(buf + len , "0x%02x ", *fc4_list);
277 len += sprintf(buf + len, "\n");
278 return len;
279 }
280
281
282 /* Convert FC_PORT_ROLE bit values to ascii string name */
283 static const struct {
284 u32 value;
285 char *name;
286 } fc_port_role_names[] = {
287 { FC_PORT_ROLE_FCP_TARGET, "FCP Target" },
288 { FC_PORT_ROLE_FCP_INITIATOR, "FCP Initiator" },
289 { FC_PORT_ROLE_IP_PORT, "IP Port" },
290 };
291 fc_bitfield_name_search(port_roles, fc_port_role_names)
292
293 /*
294 * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
295 */
296 #define FC_WELLKNOWN_PORTID_MASK 0xfffff0
297 #define FC_WELLKNOWN_ROLE_MASK 0x00000f
298 #define FC_FPORT_PORTID 0x00000e
299 #define FC_FABCTLR_PORTID 0x00000d
300 #define FC_DIRSRVR_PORTID 0x00000c
301 #define FC_TIMESRVR_PORTID 0x00000b
302 #define FC_MGMTSRVR_PORTID 0x00000a
303
304
305 static void fc_timeout_deleted_rport(struct work_struct *work);
306 static void fc_timeout_fail_rport_io(struct work_struct *work);
307 static void fc_scsi_scan_rport(struct work_struct *work);
308
309 /*
310 * Attribute counts pre object type...
311 * Increase these values if you add attributes
312 */
313 #define FC_STARGET_NUM_ATTRS 3
314 #define FC_RPORT_NUM_ATTRS 10
315 #define FC_VPORT_NUM_ATTRS 9
316 #define FC_HOST_NUM_ATTRS 29
317
318 struct fc_internal {
319 struct scsi_transport_template t;
320 struct fc_function_template *f;
321
322 /*
323 * For attributes : each object has :
324 * An array of the actual attributes structures
325 * An array of null-terminated pointers to the attribute
326 * structures - used for mid-layer interaction.
327 *
328 * The attribute containers for the starget and host are are
329 * part of the midlayer. As the remote port is specific to the
330 * fc transport, we must provide the attribute container.
331 */
332 struct device_attribute private_starget_attrs[
333 FC_STARGET_NUM_ATTRS];
334 struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
335
336 struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
337 struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
338
339 struct transport_container rport_attr_cont;
340 struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
341 struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
342
343 struct transport_container vport_attr_cont;
344 struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
345 struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
346 };
347
348 #define to_fc_internal(tmpl) container_of(tmpl, struct fc_internal, t)
349
350 static int fc_target_setup(struct transport_container *tc, struct device *dev,
351 struct device *cdev)
352 {
353 struct scsi_target *starget = to_scsi_target(dev);
354 struct fc_rport *rport = starget_to_rport(starget);
355
356 /*
357 * if parent is remote port, use values from remote port.
358 * Otherwise, this host uses the fc_transport, but not the
359 * remote port interface. As such, initialize to known non-values.
360 */
361 if (rport) {
362 fc_starget_node_name(starget) = rport->node_name;
363 fc_starget_port_name(starget) = rport->port_name;
364 fc_starget_port_id(starget) = rport->port_id;
365 } else {
366 fc_starget_node_name(starget) = -1;
367 fc_starget_port_name(starget) = -1;
368 fc_starget_port_id(starget) = -1;
369 }
370
371 return 0;
372 }
373
374 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
375 "fc_transport",
376 fc_target_setup,
377 NULL,
378 NULL);
379
380 static int fc_host_setup(struct transport_container *tc, struct device *dev,
381 struct device *cdev)
382 {
383 struct Scsi_Host *shost = dev_to_shost(dev);
384 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
385
386 /*
387 * Set default values easily detected by the midlayer as
388 * failure cases. The scsi lldd is responsible for initializing
389 * all transport attributes to valid values per host.
390 */
391 fc_host->node_name = -1;
392 fc_host->port_name = -1;
393 fc_host->permanent_port_name = -1;
394 fc_host->supported_classes = FC_COS_UNSPECIFIED;
395 memset(fc_host->supported_fc4s, 0,
396 sizeof(fc_host->supported_fc4s));
397 fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
398 fc_host->maxframe_size = -1;
399 fc_host->max_npiv_vports = 0;
400 memset(fc_host->serial_number, 0,
401 sizeof(fc_host->serial_number));
402 memset(fc_host->manufacturer, 0,
403 sizeof(fc_host->manufacturer));
404 memset(fc_host->model, 0,
405 sizeof(fc_host->model));
406 memset(fc_host->model_description, 0,
407 sizeof(fc_host->model_description));
408 memset(fc_host->hardware_version, 0,
409 sizeof(fc_host->hardware_version));
410 memset(fc_host->driver_version, 0,
411 sizeof(fc_host->driver_version));
412 memset(fc_host->firmware_version, 0,
413 sizeof(fc_host->firmware_version));
414 memset(fc_host->optionrom_version, 0,
415 sizeof(fc_host->optionrom_version));
416
417 fc_host->port_id = -1;
418 fc_host->port_type = FC_PORTTYPE_UNKNOWN;
419 fc_host->port_state = FC_PORTSTATE_UNKNOWN;
420 memset(fc_host->active_fc4s, 0,
421 sizeof(fc_host->active_fc4s));
422 fc_host->speed = FC_PORTSPEED_UNKNOWN;
423 fc_host->fabric_name = -1;
424 memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
425 memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
426
427 fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
428
429 INIT_LIST_HEAD(&fc_host->rports);
430 INIT_LIST_HEAD(&fc_host->rport_bindings);
431 INIT_LIST_HEAD(&fc_host->vports);
432 fc_host->next_rport_number = 0;
433 fc_host->next_target_id = 0;
434 fc_host->next_vport_number = 0;
435 fc_host->npiv_vports_inuse = 0;
436
437 snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
438 "fc_wq_%d", shost->host_no);
439 fc_host->work_q = alloc_workqueue("%s", 0, 0, fc_host->work_q_name);
440 if (!fc_host->work_q)
441 return -ENOMEM;
442
443 fc_host->dev_loss_tmo = fc_dev_loss_tmo;
444 snprintf(fc_host->devloss_work_q_name,
445 sizeof(fc_host->devloss_work_q_name),
446 "fc_dl_%d", shost->host_no);
447 fc_host->devloss_work_q = alloc_workqueue("%s", 0, 0,
448 fc_host->devloss_work_q_name);
449 if (!fc_host->devloss_work_q) {
450 destroy_workqueue(fc_host->work_q);
451 fc_host->work_q = NULL;
452 return -ENOMEM;
453 }
454
455 fc_bsg_hostadd(shost, fc_host);
456 /* ignore any bsg add error - we just can't do sgio */
457
458 return 0;
459 }
460
461 static int fc_host_remove(struct transport_container *tc, struct device *dev,
462 struct device *cdev)
463 {
464 struct Scsi_Host *shost = dev_to_shost(dev);
465 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
466
467 fc_bsg_remove(fc_host->rqst_q);
468 return 0;
469 }
470
471 static DECLARE_TRANSPORT_CLASS(fc_host_class,
472 "fc_host",
473 fc_host_setup,
474 fc_host_remove,
475 NULL);
476
477 /*
478 * Setup and Remove actions for remote ports are handled
479 * in the service functions below.
480 */
481 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
482 "fc_remote_ports",
483 NULL,
484 NULL,
485 NULL);
486
487 /*
488 * Setup and Remove actions for virtual ports are handled
489 * in the service functions below.
490 */
491 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
492 "fc_vports",
493 NULL,
494 NULL,
495 NULL);
496
497 /*
498 * Netlink Infrastructure
499 */
500
501 static atomic_t fc_event_seq;
502
503 /**
504 * fc_get_event_number - Obtain the next sequential FC event number
505 *
506 * Notes:
507 * We could have inlined this, but it would have required fc_event_seq to
508 * be exposed. For now, live with the subroutine call.
509 * Atomic used to avoid lock/unlock...
510 */
511 u32
512 fc_get_event_number(void)
513 {
514 return atomic_add_return(1, &fc_event_seq);
515 }
516 EXPORT_SYMBOL(fc_get_event_number);
517
518
519 /**
520 * fc_host_post_event - called to post an even on an fc_host.
521 * @shost: host the event occurred on
522 * @event_number: fc event number obtained from get_fc_event_number()
523 * @event_code: fc_host event being posted
524 * @event_data: 32bits of data for the event being posted
525 *
526 * Notes:
527 * This routine assumes no locks are held on entry.
528 */
529 void
530 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
531 enum fc_host_event_code event_code, u32 event_data)
532 {
533 struct sk_buff *skb;
534 struct nlmsghdr *nlh;
535 struct fc_nl_event *event;
536 const char *name;
537 u32 len;
538 int err;
539
540 if (!scsi_nl_sock) {
541 err = -ENOENT;
542 goto send_fail;
543 }
544
545 len = FC_NL_MSGALIGN(sizeof(*event));
546
547 skb = nlmsg_new(len, GFP_KERNEL);
548 if (!skb) {
549 err = -ENOBUFS;
550 goto send_fail;
551 }
552
553 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
554 if (!nlh) {
555 err = -ENOBUFS;
556 goto send_fail_skb;
557 }
558 event = nlmsg_data(nlh);
559
560 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
561 FC_NL_ASYNC_EVENT, len);
562 event->seconds = get_seconds();
563 event->vendor_id = 0;
564 event->host_no = shost->host_no;
565 event->event_datalen = sizeof(u32); /* bytes */
566 event->event_num = event_number;
567 event->event_code = event_code;
568 event->event_data = event_data;
569
570 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
571 GFP_KERNEL);
572 return;
573
574 send_fail_skb:
575 kfree_skb(skb);
576 send_fail:
577 name = get_fc_host_event_code_name(event_code);
578 printk(KERN_WARNING
579 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
580 __func__, shost->host_no,
581 (name) ? name : "<unknown>", event_data, err);
582 return;
583 }
584 EXPORT_SYMBOL(fc_host_post_event);
585
586
587 /**
588 * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
589 * @shost: host the event occurred on
590 * @event_number: fc event number obtained from get_fc_event_number()
591 * @data_len: amount, in bytes, of vendor unique data
592 * @data_buf: pointer to vendor unique data
593 * @vendor_id: Vendor id
594 *
595 * Notes:
596 * This routine assumes no locks are held on entry.
597 */
598 void
599 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
600 u32 data_len, char * data_buf, u64 vendor_id)
601 {
602 struct sk_buff *skb;
603 struct nlmsghdr *nlh;
604 struct fc_nl_event *event;
605 u32 len;
606 int err;
607
608 if (!scsi_nl_sock) {
609 err = -ENOENT;
610 goto send_vendor_fail;
611 }
612
613 len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
614
615 skb = nlmsg_new(len, GFP_KERNEL);
616 if (!skb) {
617 err = -ENOBUFS;
618 goto send_vendor_fail;
619 }
620
621 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
622 if (!nlh) {
623 err = -ENOBUFS;
624 goto send_vendor_fail_skb;
625 }
626 event = nlmsg_data(nlh);
627
628 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
629 FC_NL_ASYNC_EVENT, len);
630 event->seconds = get_seconds();
631 event->vendor_id = vendor_id;
632 event->host_no = shost->host_no;
633 event->event_datalen = data_len; /* bytes */
634 event->event_num = event_number;
635 event->event_code = FCH_EVT_VENDOR_UNIQUE;
636 memcpy(&event->event_data, data_buf, data_len);
637
638 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
639 GFP_KERNEL);
640 return;
641
642 send_vendor_fail_skb:
643 kfree_skb(skb);
644 send_vendor_fail:
645 printk(KERN_WARNING
646 "%s: Dropped Event : host %d vendor_unique - err %d\n",
647 __func__, shost->host_no, err);
648 return;
649 }
650 EXPORT_SYMBOL(fc_host_post_vendor_event);
651
652
653
654 static __init int fc_transport_init(void)
655 {
656 int error;
657
658 atomic_set(&fc_event_seq, 0);
659
660 error = transport_class_register(&fc_host_class);
661 if (error)
662 return error;
663 error = transport_class_register(&fc_vport_class);
664 if (error)
665 goto unreg_host_class;
666 error = transport_class_register(&fc_rport_class);
667 if (error)
668 goto unreg_vport_class;
669 error = transport_class_register(&fc_transport_class);
670 if (error)
671 goto unreg_rport_class;
672 return 0;
673
674 unreg_rport_class:
675 transport_class_unregister(&fc_rport_class);
676 unreg_vport_class:
677 transport_class_unregister(&fc_vport_class);
678 unreg_host_class:
679 transport_class_unregister(&fc_host_class);
680 return error;
681 }
682
683 static void __exit fc_transport_exit(void)
684 {
685 transport_class_unregister(&fc_transport_class);
686 transport_class_unregister(&fc_rport_class);
687 transport_class_unregister(&fc_host_class);
688 transport_class_unregister(&fc_vport_class);
689 }
690
691 /*
692 * FC Remote Port Attribute Management
693 */
694
695 #define fc_rport_show_function(field, format_string, sz, cast) \
696 static ssize_t \
697 show_fc_rport_##field (struct device *dev, \
698 struct device_attribute *attr, char *buf) \
699 { \
700 struct fc_rport *rport = transport_class_to_rport(dev); \
701 struct Scsi_Host *shost = rport_to_shost(rport); \
702 struct fc_internal *i = to_fc_internal(shost->transportt); \
703 if ((i->f->get_rport_##field) && \
704 !((rport->port_state == FC_PORTSTATE_BLOCKED) || \
705 (rport->port_state == FC_PORTSTATE_DELETED) || \
706 (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
707 i->f->get_rport_##field(rport); \
708 return snprintf(buf, sz, format_string, cast rport->field); \
709 }
710
711 #define fc_rport_store_function(field) \
712 static ssize_t \
713 store_fc_rport_##field(struct device *dev, \
714 struct device_attribute *attr, \
715 const char *buf, size_t count) \
716 { \
717 int val; \
718 struct fc_rport *rport = transport_class_to_rport(dev); \
719 struct Scsi_Host *shost = rport_to_shost(rport); \
720 struct fc_internal *i = to_fc_internal(shost->transportt); \
721 char *cp; \
722 if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
723 (rport->port_state == FC_PORTSTATE_DELETED) || \
724 (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
725 return -EBUSY; \
726 val = simple_strtoul(buf, &cp, 0); \
727 if (*cp && (*cp != '\n')) \
728 return -EINVAL; \
729 i->f->set_rport_##field(rport, val); \
730 return count; \
731 }
732
733 #define fc_rport_rd_attr(field, format_string, sz) \
734 fc_rport_show_function(field, format_string, sz, ) \
735 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
736 show_fc_rport_##field, NULL)
737
738 #define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
739 fc_rport_show_function(field, format_string, sz, (cast)) \
740 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
741 show_fc_rport_##field, NULL)
742
743 #define fc_rport_rw_attr(field, format_string, sz) \
744 fc_rport_show_function(field, format_string, sz, ) \
745 fc_rport_store_function(field) \
746 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
747 show_fc_rport_##field, \
748 store_fc_rport_##field)
749
750
751 #define fc_private_rport_show_function(field, format_string, sz, cast) \
752 static ssize_t \
753 show_fc_rport_##field (struct device *dev, \
754 struct device_attribute *attr, char *buf) \
755 { \
756 struct fc_rport *rport = transport_class_to_rport(dev); \
757 return snprintf(buf, sz, format_string, cast rport->field); \
758 }
759
760 #define fc_private_rport_rd_attr(field, format_string, sz) \
761 fc_private_rport_show_function(field, format_string, sz, ) \
762 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
763 show_fc_rport_##field, NULL)
764
765 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
766 fc_private_rport_show_function(field, format_string, sz, (cast)) \
767 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
768 show_fc_rport_##field, NULL)
769
770
771 #define fc_private_rport_rd_enum_attr(title, maxlen) \
772 static ssize_t \
773 show_fc_rport_##title (struct device *dev, \
774 struct device_attribute *attr, char *buf) \
775 { \
776 struct fc_rport *rport = transport_class_to_rport(dev); \
777 const char *name; \
778 name = get_fc_##title##_name(rport->title); \
779 if (!name) \
780 return -EINVAL; \
781 return snprintf(buf, maxlen, "%s\n", name); \
782 } \
783 static FC_DEVICE_ATTR(rport, title, S_IRUGO, \
784 show_fc_rport_##title, NULL)
785
786
787 #define SETUP_RPORT_ATTRIBUTE_RD(field) \
788 i->private_rport_attrs[count] = device_attr_rport_##field; \
789 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
790 i->private_rport_attrs[count].store = NULL; \
791 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
792 if (i->f->show_rport_##field) \
793 count++
794
795 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
796 i->private_rport_attrs[count] = device_attr_rport_##field; \
797 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
798 i->private_rport_attrs[count].store = NULL; \
799 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
800 count++
801
802 #define SETUP_RPORT_ATTRIBUTE_RW(field) \
803 i->private_rport_attrs[count] = device_attr_rport_##field; \
804 if (!i->f->set_rport_##field) { \
805 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
806 i->private_rport_attrs[count].store = NULL; \
807 } \
808 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
809 if (i->f->show_rport_##field) \
810 count++
811
812 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
813 { \
814 i->private_rport_attrs[count] = device_attr_rport_##field; \
815 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
816 count++; \
817 }
818
819
820 /* The FC Transport Remote Port Attributes: */
821
822 /* Fixed Remote Port Attributes */
823
824 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
825
826 static ssize_t
827 show_fc_rport_supported_classes (struct device *dev,
828 struct device_attribute *attr, char *buf)
829 {
830 struct fc_rport *rport = transport_class_to_rport(dev);
831 if (rport->supported_classes == FC_COS_UNSPECIFIED)
832 return snprintf(buf, 20, "unspecified\n");
833 return get_fc_cos_names(rport->supported_classes, buf);
834 }
835 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
836 show_fc_rport_supported_classes, NULL);
837
838 /* Dynamic Remote Port Attributes */
839
840 /*
841 * dev_loss_tmo attribute
842 */
843 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
844 {
845 char *cp;
846
847 *val = simple_strtoul(buf, &cp, 0);
848 if ((*cp && (*cp != '\n')) || (*val < 0))
849 return -EINVAL;
850 /*
851 * Check for overflow; dev_loss_tmo is u32
852 */
853 if (*val > UINT_MAX)
854 return -EINVAL;
855
856 return 0;
857 }
858
859 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
860 unsigned long val)
861 {
862 struct Scsi_Host *shost = rport_to_shost(rport);
863 struct fc_internal *i = to_fc_internal(shost->transportt);
864
865 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
866 (rport->port_state == FC_PORTSTATE_DELETED) ||
867 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
868 return -EBUSY;
869 /*
870 * Check for overflow; dev_loss_tmo is u32
871 */
872 if (val > UINT_MAX)
873 return -EINVAL;
874
875 /*
876 * If fast_io_fail is off we have to cap
877 * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
878 */
879 if (rport->fast_io_fail_tmo == -1 &&
880 val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
881 return -EINVAL;
882
883 i->f->set_rport_dev_loss_tmo(rport, val);
884 return 0;
885 }
886
887 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
888 static ssize_t
889 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
890 const char *buf, size_t count)
891 {
892 struct fc_rport *rport = transport_class_to_rport(dev);
893 unsigned long val;
894 int rc;
895
896 rc = fc_str_to_dev_loss(buf, &val);
897 if (rc)
898 return rc;
899
900 rc = fc_rport_set_dev_loss_tmo(rport, val);
901 if (rc)
902 return rc;
903 return count;
904 }
905 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
906 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
907
908
909 /* Private Remote Port Attributes */
910
911 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
912 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
913 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
914
915 static ssize_t
916 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
917 char *buf)
918 {
919 struct fc_rport *rport = transport_class_to_rport(dev);
920
921 /* identify any roles that are port_id specific */
922 if ((rport->port_id != -1) &&
923 (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
924 FC_WELLKNOWN_PORTID_MASK) {
925 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
926 case FC_FPORT_PORTID:
927 return snprintf(buf, 30, "Fabric Port\n");
928 case FC_FABCTLR_PORTID:
929 return snprintf(buf, 30, "Fabric Controller\n");
930 case FC_DIRSRVR_PORTID:
931 return snprintf(buf, 30, "Directory Server\n");
932 case FC_TIMESRVR_PORTID:
933 return snprintf(buf, 30, "Time Server\n");
934 case FC_MGMTSRVR_PORTID:
935 return snprintf(buf, 30, "Management Server\n");
936 default:
937 return snprintf(buf, 30, "Unknown Fabric Entity\n");
938 }
939 } else {
940 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
941 return snprintf(buf, 20, "unknown\n");
942 return get_fc_port_roles_names(rport->roles, buf);
943 }
944 }
945 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
946 show_fc_rport_roles, NULL);
947
948 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
949 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
950
951 /*
952 * fast_io_fail_tmo attribute
953 */
954 static ssize_t
955 show_fc_rport_fast_io_fail_tmo (struct device *dev,
956 struct device_attribute *attr, char *buf)
957 {
958 struct fc_rport *rport = transport_class_to_rport(dev);
959
960 if (rport->fast_io_fail_tmo == -1)
961 return snprintf(buf, 5, "off\n");
962 return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
963 }
964
965 static ssize_t
966 store_fc_rport_fast_io_fail_tmo(struct device *dev,
967 struct device_attribute *attr, const char *buf,
968 size_t count)
969 {
970 int val;
971 char *cp;
972 struct fc_rport *rport = transport_class_to_rport(dev);
973
974 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
975 (rport->port_state == FC_PORTSTATE_DELETED) ||
976 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
977 return -EBUSY;
978 if (strncmp(buf, "off", 3) == 0)
979 rport->fast_io_fail_tmo = -1;
980 else {
981 val = simple_strtoul(buf, &cp, 0);
982 if ((*cp && (*cp != '\n')) || (val < 0))
983 return -EINVAL;
984 /*
985 * Cap fast_io_fail by dev_loss_tmo or
986 * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
987 */
988 if ((val >= rport->dev_loss_tmo) ||
989 (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
990 return -EINVAL;
991
992 rport->fast_io_fail_tmo = val;
993 }
994 return count;
995 }
996 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
997 show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
998
999
1000 /*
1001 * FC SCSI Target Attribute Management
1002 */
1003
1004 /*
1005 * Note: in the target show function we recognize when the remote
1006 * port is in the hierarchy and do not allow the driver to get
1007 * involved in sysfs functions. The driver only gets involved if
1008 * it's the "old" style that doesn't use rports.
1009 */
1010 #define fc_starget_show_function(field, format_string, sz, cast) \
1011 static ssize_t \
1012 show_fc_starget_##field (struct device *dev, \
1013 struct device_attribute *attr, char *buf) \
1014 { \
1015 struct scsi_target *starget = transport_class_to_starget(dev); \
1016 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
1017 struct fc_internal *i = to_fc_internal(shost->transportt); \
1018 struct fc_rport *rport = starget_to_rport(starget); \
1019 if (rport) \
1020 fc_starget_##field(starget) = rport->field; \
1021 else if (i->f->get_starget_##field) \
1022 i->f->get_starget_##field(starget); \
1023 return snprintf(buf, sz, format_string, \
1024 cast fc_starget_##field(starget)); \
1025 }
1026
1027 #define fc_starget_rd_attr(field, format_string, sz) \
1028 fc_starget_show_function(field, format_string, sz, ) \
1029 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1030 show_fc_starget_##field, NULL)
1031
1032 #define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
1033 fc_starget_show_function(field, format_string, sz, (cast)) \
1034 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1035 show_fc_starget_##field, NULL)
1036
1037 #define SETUP_STARGET_ATTRIBUTE_RD(field) \
1038 i->private_starget_attrs[count] = device_attr_starget_##field; \
1039 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1040 i->private_starget_attrs[count].store = NULL; \
1041 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1042 if (i->f->show_starget_##field) \
1043 count++
1044
1045 #define SETUP_STARGET_ATTRIBUTE_RW(field) \
1046 i->private_starget_attrs[count] = device_attr_starget_##field; \
1047 if (!i->f->set_starget_##field) { \
1048 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1049 i->private_starget_attrs[count].store = NULL; \
1050 } \
1051 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1052 if (i->f->show_starget_##field) \
1053 count++
1054
1055 /* The FC Transport SCSI Target Attributes: */
1056 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1057 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1058 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1059
1060
1061 /*
1062 * FC Virtual Port Attribute Management
1063 */
1064
1065 #define fc_vport_show_function(field, format_string, sz, cast) \
1066 static ssize_t \
1067 show_fc_vport_##field (struct device *dev, \
1068 struct device_attribute *attr, char *buf) \
1069 { \
1070 struct fc_vport *vport = transport_class_to_vport(dev); \
1071 struct Scsi_Host *shost = vport_to_shost(vport); \
1072 struct fc_internal *i = to_fc_internal(shost->transportt); \
1073 if ((i->f->get_vport_##field) && \
1074 !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))) \
1075 i->f->get_vport_##field(vport); \
1076 return snprintf(buf, sz, format_string, cast vport->field); \
1077 }
1078
1079 #define fc_vport_store_function(field) \
1080 static ssize_t \
1081 store_fc_vport_##field(struct device *dev, \
1082 struct device_attribute *attr, \
1083 const char *buf, size_t count) \
1084 { \
1085 int val; \
1086 struct fc_vport *vport = transport_class_to_vport(dev); \
1087 struct Scsi_Host *shost = vport_to_shost(vport); \
1088 struct fc_internal *i = to_fc_internal(shost->transportt); \
1089 char *cp; \
1090 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1091 return -EBUSY; \
1092 val = simple_strtoul(buf, &cp, 0); \
1093 if (*cp && (*cp != '\n')) \
1094 return -EINVAL; \
1095 i->f->set_vport_##field(vport, val); \
1096 return count; \
1097 }
1098
1099 #define fc_vport_store_str_function(field, slen) \
1100 static ssize_t \
1101 store_fc_vport_##field(struct device *dev, \
1102 struct device_attribute *attr, \
1103 const char *buf, size_t count) \
1104 { \
1105 struct fc_vport *vport = transport_class_to_vport(dev); \
1106 struct Scsi_Host *shost = vport_to_shost(vport); \
1107 struct fc_internal *i = to_fc_internal(shost->transportt); \
1108 unsigned int cnt=count; \
1109 \
1110 /* count may include a LF at end of string */ \
1111 if (buf[cnt-1] == '\n') \
1112 cnt--; \
1113 if (cnt > ((slen) - 1)) \
1114 return -EINVAL; \
1115 memcpy(vport->field, buf, cnt); \
1116 i->f->set_vport_##field(vport); \
1117 return count; \
1118 }
1119
1120 #define fc_vport_rd_attr(field, format_string, sz) \
1121 fc_vport_show_function(field, format_string, sz, ) \
1122 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1123 show_fc_vport_##field, NULL)
1124
1125 #define fc_vport_rd_attr_cast(field, format_string, sz, cast) \
1126 fc_vport_show_function(field, format_string, sz, (cast)) \
1127 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1128 show_fc_vport_##field, NULL)
1129
1130 #define fc_vport_rw_attr(field, format_string, sz) \
1131 fc_vport_show_function(field, format_string, sz, ) \
1132 fc_vport_store_function(field) \
1133 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1134 show_fc_vport_##field, \
1135 store_fc_vport_##field)
1136
1137 #define fc_private_vport_show_function(field, format_string, sz, cast) \
1138 static ssize_t \
1139 show_fc_vport_##field (struct device *dev, \
1140 struct device_attribute *attr, char *buf) \
1141 { \
1142 struct fc_vport *vport = transport_class_to_vport(dev); \
1143 return snprintf(buf, sz, format_string, cast vport->field); \
1144 }
1145
1146 #define fc_private_vport_store_u32_function(field) \
1147 static ssize_t \
1148 store_fc_vport_##field(struct device *dev, \
1149 struct device_attribute *attr, \
1150 const char *buf, size_t count) \
1151 { \
1152 u32 val; \
1153 struct fc_vport *vport = transport_class_to_vport(dev); \
1154 char *cp; \
1155 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1156 return -EBUSY; \
1157 val = simple_strtoul(buf, &cp, 0); \
1158 if (*cp && (*cp != '\n')) \
1159 return -EINVAL; \
1160 vport->field = val; \
1161 return count; \
1162 }
1163
1164
1165 #define fc_private_vport_rd_attr(field, format_string, sz) \
1166 fc_private_vport_show_function(field, format_string, sz, ) \
1167 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1168 show_fc_vport_##field, NULL)
1169
1170 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast) \
1171 fc_private_vport_show_function(field, format_string, sz, (cast)) \
1172 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1173 show_fc_vport_##field, NULL)
1174
1175 #define fc_private_vport_rw_u32_attr(field, format_string, sz) \
1176 fc_private_vport_show_function(field, format_string, sz, ) \
1177 fc_private_vport_store_u32_function(field) \
1178 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1179 show_fc_vport_##field, \
1180 store_fc_vport_##field)
1181
1182
1183 #define fc_private_vport_rd_enum_attr(title, maxlen) \
1184 static ssize_t \
1185 show_fc_vport_##title (struct device *dev, \
1186 struct device_attribute *attr, \
1187 char *buf) \
1188 { \
1189 struct fc_vport *vport = transport_class_to_vport(dev); \
1190 const char *name; \
1191 name = get_fc_##title##_name(vport->title); \
1192 if (!name) \
1193 return -EINVAL; \
1194 return snprintf(buf, maxlen, "%s\n", name); \
1195 } \
1196 static FC_DEVICE_ATTR(vport, title, S_IRUGO, \
1197 show_fc_vport_##title, NULL)
1198
1199
1200 #define SETUP_VPORT_ATTRIBUTE_RD(field) \
1201 i->private_vport_attrs[count] = device_attr_vport_##field; \
1202 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1203 i->private_vport_attrs[count].store = NULL; \
1204 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1205 if (i->f->get_##field) \
1206 count++
1207 /* NOTE: Above MACRO differs: checks function not show bit */
1208
1209 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field) \
1210 i->private_vport_attrs[count] = device_attr_vport_##field; \
1211 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1212 i->private_vport_attrs[count].store = NULL; \
1213 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1214 count++
1215
1216 #define SETUP_VPORT_ATTRIBUTE_WR(field) \
1217 i->private_vport_attrs[count] = device_attr_vport_##field; \
1218 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1219 if (i->f->field) \
1220 count++
1221 /* NOTE: Above MACRO differs: checks function */
1222
1223 #define SETUP_VPORT_ATTRIBUTE_RW(field) \
1224 i->private_vport_attrs[count] = device_attr_vport_##field; \
1225 if (!i->f->set_vport_##field) { \
1226 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1227 i->private_vport_attrs[count].store = NULL; \
1228 } \
1229 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1230 count++
1231 /* NOTE: Above MACRO differs: does not check show bit */
1232
1233 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field) \
1234 { \
1235 i->private_vport_attrs[count] = device_attr_vport_##field; \
1236 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1237 count++; \
1238 }
1239
1240
1241 /* The FC Transport Virtual Port Attributes: */
1242
1243 /* Fixed Virtual Port Attributes */
1244
1245 /* Dynamic Virtual Port Attributes */
1246
1247 /* Private Virtual Port Attributes */
1248
1249 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1250 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1251 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1252 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1253
1254 static ssize_t
1255 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1256 char *buf)
1257 {
1258 struct fc_vport *vport = transport_class_to_vport(dev);
1259
1260 if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1261 return snprintf(buf, 20, "unknown\n");
1262 return get_fc_port_roles_names(vport->roles, buf);
1263 }
1264 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1265
1266 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1267
1268 fc_private_vport_show_function(symbolic_name, "%s\n",
1269 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1270 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1271 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1272 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1273
1274 static ssize_t
1275 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1276 const char *buf, size_t count)
1277 {
1278 struct fc_vport *vport = transport_class_to_vport(dev);
1279 struct Scsi_Host *shost = vport_to_shost(vport);
1280 unsigned long flags;
1281
1282 spin_lock_irqsave(shost->host_lock, flags);
1283 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1284 spin_unlock_irqrestore(shost->host_lock, flags);
1285 return -EBUSY;
1286 }
1287 vport->flags |= FC_VPORT_DELETING;
1288 spin_unlock_irqrestore(shost->host_lock, flags);
1289
1290 fc_queue_work(shost, &vport->vport_delete_work);
1291 return count;
1292 }
1293 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1294 NULL, store_fc_vport_delete);
1295
1296
1297 /*
1298 * Enable/Disable vport
1299 * Write "1" to disable, write "0" to enable
1300 */
1301 static ssize_t
1302 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1303 const char *buf,
1304 size_t count)
1305 {
1306 struct fc_vport *vport = transport_class_to_vport(dev);
1307 struct Scsi_Host *shost = vport_to_shost(vport);
1308 struct fc_internal *i = to_fc_internal(shost->transportt);
1309 int stat;
1310
1311 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1312 return -EBUSY;
1313
1314 if (*buf == '0') {
1315 if (vport->vport_state != FC_VPORT_DISABLED)
1316 return -EALREADY;
1317 } else if (*buf == '1') {
1318 if (vport->vport_state == FC_VPORT_DISABLED)
1319 return -EALREADY;
1320 } else
1321 return -EINVAL;
1322
1323 stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1324 return stat ? stat : count;
1325 }
1326 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1327 NULL, store_fc_vport_disable);
1328
1329
1330 /*
1331 * Host Attribute Management
1332 */
1333
1334 #define fc_host_show_function(field, format_string, sz, cast) \
1335 static ssize_t \
1336 show_fc_host_##field (struct device *dev, \
1337 struct device_attribute *attr, char *buf) \
1338 { \
1339 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1340 struct fc_internal *i = to_fc_internal(shost->transportt); \
1341 if (i->f->get_host_##field) \
1342 i->f->get_host_##field(shost); \
1343 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1344 }
1345
1346 #define fc_host_store_function(field) \
1347 static ssize_t \
1348 store_fc_host_##field(struct device *dev, \
1349 struct device_attribute *attr, \
1350 const char *buf, size_t count) \
1351 { \
1352 int val; \
1353 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1354 struct fc_internal *i = to_fc_internal(shost->transportt); \
1355 char *cp; \
1356 \
1357 val = simple_strtoul(buf, &cp, 0); \
1358 if (*cp && (*cp != '\n')) \
1359 return -EINVAL; \
1360 i->f->set_host_##field(shost, val); \
1361 return count; \
1362 }
1363
1364 #define fc_host_store_str_function(field, slen) \
1365 static ssize_t \
1366 store_fc_host_##field(struct device *dev, \
1367 struct device_attribute *attr, \
1368 const char *buf, size_t count) \
1369 { \
1370 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1371 struct fc_internal *i = to_fc_internal(shost->transportt); \
1372 unsigned int cnt=count; \
1373 \
1374 /* count may include a LF at end of string */ \
1375 if (buf[cnt-1] == '\n') \
1376 cnt--; \
1377 if (cnt > ((slen) - 1)) \
1378 return -EINVAL; \
1379 memcpy(fc_host_##field(shost), buf, cnt); \
1380 i->f->set_host_##field(shost); \
1381 return count; \
1382 }
1383
1384 #define fc_host_rd_attr(field, format_string, sz) \
1385 fc_host_show_function(field, format_string, sz, ) \
1386 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1387 show_fc_host_##field, NULL)
1388
1389 #define fc_host_rd_attr_cast(field, format_string, sz, cast) \
1390 fc_host_show_function(field, format_string, sz, (cast)) \
1391 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1392 show_fc_host_##field, NULL)
1393
1394 #define fc_host_rw_attr(field, format_string, sz) \
1395 fc_host_show_function(field, format_string, sz, ) \
1396 fc_host_store_function(field) \
1397 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
1398 show_fc_host_##field, \
1399 store_fc_host_##field)
1400
1401 #define fc_host_rd_enum_attr(title, maxlen) \
1402 static ssize_t \
1403 show_fc_host_##title (struct device *dev, \
1404 struct device_attribute *attr, char *buf) \
1405 { \
1406 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1407 struct fc_internal *i = to_fc_internal(shost->transportt); \
1408 const char *name; \
1409 if (i->f->get_host_##title) \
1410 i->f->get_host_##title(shost); \
1411 name = get_fc_##title##_name(fc_host_##title(shost)); \
1412 if (!name) \
1413 return -EINVAL; \
1414 return snprintf(buf, maxlen, "%s\n", name); \
1415 } \
1416 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1417
1418 #define SETUP_HOST_ATTRIBUTE_RD(field) \
1419 i->private_host_attrs[count] = device_attr_host_##field; \
1420 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1421 i->private_host_attrs[count].store = NULL; \
1422 i->host_attrs[count] = &i->private_host_attrs[count]; \
1423 if (i->f->show_host_##field) \
1424 count++
1425
1426 #define SETUP_HOST_ATTRIBUTE_RD_NS(field) \
1427 i->private_host_attrs[count] = device_attr_host_##field; \
1428 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1429 i->private_host_attrs[count].store = NULL; \
1430 i->host_attrs[count] = &i->private_host_attrs[count]; \
1431 count++
1432
1433 #define SETUP_HOST_ATTRIBUTE_RW(field) \
1434 i->private_host_attrs[count] = device_attr_host_##field; \
1435 if (!i->f->set_host_##field) { \
1436 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1437 i->private_host_attrs[count].store = NULL; \
1438 } \
1439 i->host_attrs[count] = &i->private_host_attrs[count]; \
1440 if (i->f->show_host_##field) \
1441 count++
1442
1443
1444 #define fc_private_host_show_function(field, format_string, sz, cast) \
1445 static ssize_t \
1446 show_fc_host_##field (struct device *dev, \
1447 struct device_attribute *attr, char *buf) \
1448 { \
1449 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1450 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1451 }
1452
1453 #define fc_private_host_rd_attr(field, format_string, sz) \
1454 fc_private_host_show_function(field, format_string, sz, ) \
1455 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1456 show_fc_host_##field, NULL)
1457
1458 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
1459 fc_private_host_show_function(field, format_string, sz, (cast)) \
1460 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1461 show_fc_host_##field, NULL)
1462
1463 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
1464 i->private_host_attrs[count] = device_attr_host_##field; \
1465 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1466 i->private_host_attrs[count].store = NULL; \
1467 i->host_attrs[count] = &i->private_host_attrs[count]; \
1468 count++
1469
1470 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
1471 { \
1472 i->private_host_attrs[count] = device_attr_host_##field; \
1473 i->host_attrs[count] = &i->private_host_attrs[count]; \
1474 count++; \
1475 }
1476
1477
1478 /* Fixed Host Attributes */
1479
1480 static ssize_t
1481 show_fc_host_supported_classes (struct device *dev,
1482 struct device_attribute *attr, char *buf)
1483 {
1484 struct Scsi_Host *shost = transport_class_to_shost(dev);
1485
1486 if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1487 return snprintf(buf, 20, "unspecified\n");
1488
1489 return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1490 }
1491 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1492 show_fc_host_supported_classes, NULL);
1493
1494 static ssize_t
1495 show_fc_host_supported_fc4s (struct device *dev,
1496 struct device_attribute *attr, char *buf)
1497 {
1498 struct Scsi_Host *shost = transport_class_to_shost(dev);
1499 return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1500 }
1501 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1502 show_fc_host_supported_fc4s, NULL);
1503
1504 static ssize_t
1505 show_fc_host_supported_speeds (struct device *dev,
1506 struct device_attribute *attr, char *buf)
1507 {
1508 struct Scsi_Host *shost = transport_class_to_shost(dev);
1509
1510 if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1511 return snprintf(buf, 20, "unknown\n");
1512
1513 return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1514 }
1515 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1516 show_fc_host_supported_speeds, NULL);
1517
1518
1519 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1520 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1521 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1522 unsigned long long);
1523 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1524 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1525 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1526 fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
1527 fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1528 fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1529 fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1530 fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1531 fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1532 fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1533
1534
1535 /* Dynamic Host Attributes */
1536
1537 static ssize_t
1538 show_fc_host_active_fc4s (struct device *dev,
1539 struct device_attribute *attr, char *buf)
1540 {
1541 struct Scsi_Host *shost = transport_class_to_shost(dev);
1542 struct fc_internal *i = to_fc_internal(shost->transportt);
1543
1544 if (i->f->get_host_active_fc4s)
1545 i->f->get_host_active_fc4s(shost);
1546
1547 return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1548 }
1549 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1550 show_fc_host_active_fc4s, NULL);
1551
1552 static ssize_t
1553 show_fc_host_speed (struct device *dev,
1554 struct device_attribute *attr, char *buf)
1555 {
1556 struct Scsi_Host *shost = transport_class_to_shost(dev);
1557 struct fc_internal *i = to_fc_internal(shost->transportt);
1558
1559 if (i->f->get_host_speed)
1560 i->f->get_host_speed(shost);
1561
1562 if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1563 return snprintf(buf, 20, "unknown\n");
1564
1565 return get_fc_port_speed_names(fc_host_speed(shost), buf);
1566 }
1567 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1568 show_fc_host_speed, NULL);
1569
1570
1571 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1572 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1573 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1574 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1575 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1576
1577 fc_private_host_show_function(system_hostname, "%s\n",
1578 FC_SYMBOLIC_NAME_SIZE + 1, )
1579 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1580 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1581 show_fc_host_system_hostname, store_fc_host_system_hostname);
1582
1583
1584 /* Private Host Attributes */
1585
1586 static ssize_t
1587 show_fc_private_host_tgtid_bind_type(struct device *dev,
1588 struct device_attribute *attr, char *buf)
1589 {
1590 struct Scsi_Host *shost = transport_class_to_shost(dev);
1591 const char *name;
1592
1593 name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1594 if (!name)
1595 return -EINVAL;
1596 return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1597 }
1598
1599 #define get_list_head_entry(pos, head, member) \
1600 pos = list_entry((head)->next, typeof(*pos), member)
1601
1602 static ssize_t
1603 store_fc_private_host_tgtid_bind_type(struct device *dev,
1604 struct device_attribute *attr, const char *buf, size_t count)
1605 {
1606 struct Scsi_Host *shost = transport_class_to_shost(dev);
1607 struct fc_rport *rport;
1608 enum fc_tgtid_binding_type val;
1609 unsigned long flags;
1610
1611 if (get_fc_tgtid_bind_type_match(buf, &val))
1612 return -EINVAL;
1613
1614 /* if changing bind type, purge all unused consistent bindings */
1615 if (val != fc_host_tgtid_bind_type(shost)) {
1616 spin_lock_irqsave(shost->host_lock, flags);
1617 while (!list_empty(&fc_host_rport_bindings(shost))) {
1618 get_list_head_entry(rport,
1619 &fc_host_rport_bindings(shost), peers);
1620 list_del(&rport->peers);
1621 rport->port_state = FC_PORTSTATE_DELETED;
1622 fc_queue_work(shost, &rport->rport_delete_work);
1623 }
1624 spin_unlock_irqrestore(shost->host_lock, flags);
1625 }
1626
1627 fc_host_tgtid_bind_type(shost) = val;
1628 return count;
1629 }
1630
1631 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1632 show_fc_private_host_tgtid_bind_type,
1633 store_fc_private_host_tgtid_bind_type);
1634
1635 static ssize_t
1636 store_fc_private_host_issue_lip(struct device *dev,
1637 struct device_attribute *attr, const char *buf, size_t count)
1638 {
1639 struct Scsi_Host *shost = transport_class_to_shost(dev);
1640 struct fc_internal *i = to_fc_internal(shost->transportt);
1641 int ret;
1642
1643 /* ignore any data value written to the attribute */
1644 if (i->f->issue_fc_host_lip) {
1645 ret = i->f->issue_fc_host_lip(shost);
1646 return ret ? ret: count;
1647 }
1648
1649 return -ENOENT;
1650 }
1651
1652 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1653 store_fc_private_host_issue_lip);
1654
1655 static ssize_t
1656 store_fc_private_host_dev_loss_tmo(struct device *dev,
1657 struct device_attribute *attr,
1658 const char *buf, size_t count)
1659 {
1660 struct Scsi_Host *shost = transport_class_to_shost(dev);
1661 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1662 struct fc_rport *rport;
1663 unsigned long val, flags;
1664 int rc;
1665
1666 rc = fc_str_to_dev_loss(buf, &val);
1667 if (rc)
1668 return rc;
1669
1670 fc_host_dev_loss_tmo(shost) = val;
1671 spin_lock_irqsave(shost->host_lock, flags);
1672 list_for_each_entry(rport, &fc_host->rports, peers)
1673 fc_rport_set_dev_loss_tmo(rport, val);
1674 spin_unlock_irqrestore(shost->host_lock, flags);
1675 return count;
1676 }
1677
1678 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
1679 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
1680 show_fc_host_dev_loss_tmo,
1681 store_fc_private_host_dev_loss_tmo);
1682
1683 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1684
1685 /*
1686 * Host Statistics Management
1687 */
1688
1689 /* Show a given an attribute in the statistics group */
1690 static ssize_t
1691 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1692 {
1693 struct Scsi_Host *shost = transport_class_to_shost(dev);
1694 struct fc_internal *i = to_fc_internal(shost->transportt);
1695 struct fc_host_statistics *stats;
1696 ssize_t ret = -ENOENT;
1697
1698 if (offset > sizeof(struct fc_host_statistics) ||
1699 offset % sizeof(u64) != 0)
1700 WARN_ON(1);
1701
1702 if (i->f->get_fc_host_stats) {
1703 stats = (i->f->get_fc_host_stats)(shost);
1704 if (stats)
1705 ret = snprintf(buf, 20, "0x%llx\n",
1706 (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1707 }
1708 return ret;
1709 }
1710
1711
1712 /* generate a read-only statistics attribute */
1713 #define fc_host_statistic(name) \
1714 static ssize_t show_fcstat_##name(struct device *cd, \
1715 struct device_attribute *attr, \
1716 char *buf) \
1717 { \
1718 return fc_stat_show(cd, buf, \
1719 offsetof(struct fc_host_statistics, name)); \
1720 } \
1721 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1722
1723 fc_host_statistic(seconds_since_last_reset);
1724 fc_host_statistic(tx_frames);
1725 fc_host_statistic(tx_words);
1726 fc_host_statistic(rx_frames);
1727 fc_host_statistic(rx_words);
1728 fc_host_statistic(lip_count);
1729 fc_host_statistic(nos_count);
1730 fc_host_statistic(error_frames);
1731 fc_host_statistic(dumped_frames);
1732 fc_host_statistic(link_failure_count);
1733 fc_host_statistic(loss_of_sync_count);
1734 fc_host_statistic(loss_of_signal_count);
1735 fc_host_statistic(prim_seq_protocol_err_count);
1736 fc_host_statistic(invalid_tx_word_count);
1737 fc_host_statistic(invalid_crc_count);
1738 fc_host_statistic(fcp_input_requests);
1739 fc_host_statistic(fcp_output_requests);
1740 fc_host_statistic(fcp_control_requests);
1741 fc_host_statistic(fcp_input_megabytes);
1742 fc_host_statistic(fcp_output_megabytes);
1743 fc_host_statistic(fcp_packet_alloc_failures);
1744 fc_host_statistic(fcp_packet_aborts);
1745 fc_host_statistic(fcp_frame_alloc_failures);
1746 fc_host_statistic(fc_no_free_exch);
1747 fc_host_statistic(fc_no_free_exch_xid);
1748 fc_host_statistic(fc_xid_not_found);
1749 fc_host_statistic(fc_xid_busy);
1750 fc_host_statistic(fc_seq_not_found);
1751 fc_host_statistic(fc_non_bls_resp);
1752
1753 static ssize_t
1754 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1755 const char *buf, size_t count)
1756 {
1757 struct Scsi_Host *shost = transport_class_to_shost(dev);
1758 struct fc_internal *i = to_fc_internal(shost->transportt);
1759
1760 /* ignore any data value written to the attribute */
1761 if (i->f->reset_fc_host_stats) {
1762 i->f->reset_fc_host_stats(shost);
1763 return count;
1764 }
1765
1766 return -ENOENT;
1767 }
1768 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1769 fc_reset_statistics);
1770
1771 static struct attribute *fc_statistics_attrs[] = {
1772 &device_attr_host_seconds_since_last_reset.attr,
1773 &device_attr_host_tx_frames.attr,
1774 &device_attr_host_tx_words.attr,
1775 &device_attr_host_rx_frames.attr,
1776 &device_attr_host_rx_words.attr,
1777 &device_attr_host_lip_count.attr,
1778 &device_attr_host_nos_count.attr,
1779 &device_attr_host_error_frames.attr,
1780 &device_attr_host_dumped_frames.attr,
1781 &device_attr_host_link_failure_count.attr,
1782 &device_attr_host_loss_of_sync_count.attr,
1783 &device_attr_host_loss_of_signal_count.attr,
1784 &device_attr_host_prim_seq_protocol_err_count.attr,
1785 &device_attr_host_invalid_tx_word_count.attr,
1786 &device_attr_host_invalid_crc_count.attr,
1787 &device_attr_host_fcp_input_requests.attr,
1788 &device_attr_host_fcp_output_requests.attr,
1789 &device_attr_host_fcp_control_requests.attr,
1790 &device_attr_host_fcp_input_megabytes.attr,
1791 &device_attr_host_fcp_output_megabytes.attr,
1792 &device_attr_host_fcp_packet_alloc_failures.attr,
1793 &device_attr_host_fcp_packet_aborts.attr,
1794 &device_attr_host_fcp_frame_alloc_failures.attr,
1795 &device_attr_host_fc_no_free_exch.attr,
1796 &device_attr_host_fc_no_free_exch_xid.attr,
1797 &device_attr_host_fc_xid_not_found.attr,
1798 &device_attr_host_fc_xid_busy.attr,
1799 &device_attr_host_fc_seq_not_found.attr,
1800 &device_attr_host_fc_non_bls_resp.attr,
1801 &device_attr_host_reset_statistics.attr,
1802 NULL
1803 };
1804
1805 static struct attribute_group fc_statistics_group = {
1806 .name = "statistics",
1807 .attrs = fc_statistics_attrs,
1808 };
1809
1810
1811 /* Host Vport Attributes */
1812
1813 static int
1814 fc_parse_wwn(const char *ns, u64 *nm)
1815 {
1816 unsigned int i, j;
1817 u8 wwn[8];
1818
1819 memset(wwn, 0, sizeof(wwn));
1820
1821 /* Validate and store the new name */
1822 for (i=0, j=0; i < 16; i++) {
1823 int value;
1824
1825 value = hex_to_bin(*ns++);
1826 if (value >= 0)
1827 j = (j << 4) | value;
1828 else
1829 return -EINVAL;
1830 if (i % 2) {
1831 wwn[i/2] = j & 0xff;
1832 j = 0;
1833 }
1834 }
1835
1836 *nm = wwn_to_u64(wwn);
1837
1838 return 0;
1839 }
1840
1841
1842 /*
1843 * "Short-cut" sysfs variable to create a new vport on a FC Host.
1844 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1845 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1846 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1847 */
1848 static ssize_t
1849 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1850 const char *buf, size_t count)
1851 {
1852 struct Scsi_Host *shost = transport_class_to_shost(dev);
1853 struct fc_vport_identifiers vid;
1854 struct fc_vport *vport;
1855 unsigned int cnt=count;
1856 int stat;
1857
1858 memset(&vid, 0, sizeof(vid));
1859
1860 /* count may include a LF at end of string */
1861 if (buf[cnt-1] == '\n')
1862 cnt--;
1863
1864 /* validate we have enough characters for WWPN */
1865 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1866 return -EINVAL;
1867
1868 stat = fc_parse_wwn(&buf[0], &vid.port_name);
1869 if (stat)
1870 return stat;
1871
1872 stat = fc_parse_wwn(&buf[17], &vid.node_name);
1873 if (stat)
1874 return stat;
1875
1876 vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1877 vid.vport_type = FC_PORTTYPE_NPIV;
1878 /* vid.symbolic_name is already zero/NULL's */
1879 vid.disable = false; /* always enabled */
1880
1881 /* we only allow support on Channel 0 !!! */
1882 stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1883 return stat ? stat : count;
1884 }
1885 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1886 store_fc_host_vport_create);
1887
1888
1889 /*
1890 * "Short-cut" sysfs variable to delete a vport on a FC Host.
1891 * Vport is identified by a string containing "<WWPN>:<WWNN>".
1892 * The WWNs are specified as hex characters, and may *not* contain
1893 * any prefixes (e.g. 0x, x, etc)
1894 */
1895 static ssize_t
1896 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1897 const char *buf, size_t count)
1898 {
1899 struct Scsi_Host *shost = transport_class_to_shost(dev);
1900 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1901 struct fc_vport *vport;
1902 u64 wwpn, wwnn;
1903 unsigned long flags;
1904 unsigned int cnt=count;
1905 int stat, match;
1906
1907 /* count may include a LF at end of string */
1908 if (buf[cnt-1] == '\n')
1909 cnt--;
1910
1911 /* validate we have enough characters for WWPN */
1912 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1913 return -EINVAL;
1914
1915 stat = fc_parse_wwn(&buf[0], &wwpn);
1916 if (stat)
1917 return stat;
1918
1919 stat = fc_parse_wwn(&buf[17], &wwnn);
1920 if (stat)
1921 return stat;
1922
1923 spin_lock_irqsave(shost->host_lock, flags);
1924 match = 0;
1925 /* we only allow support on Channel 0 !!! */
1926 list_for_each_entry(vport, &fc_host->vports, peers) {
1927 if ((vport->channel == 0) &&
1928 (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1929 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1930 break;
1931 vport->flags |= FC_VPORT_DELETING;
1932 match = 1;
1933 break;
1934 }
1935 }
1936 spin_unlock_irqrestore(shost->host_lock, flags);
1937
1938 if (!match)
1939 return -ENODEV;
1940
1941 stat = fc_vport_terminate(vport);
1942 return stat ? stat : count;
1943 }
1944 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1945 store_fc_host_vport_delete);
1946
1947
1948 static int fc_host_match(struct attribute_container *cont,
1949 struct device *dev)
1950 {
1951 struct Scsi_Host *shost;
1952 struct fc_internal *i;
1953
1954 if (!scsi_is_host_device(dev))
1955 return 0;
1956
1957 shost = dev_to_shost(dev);
1958 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1959 != &fc_host_class.class)
1960 return 0;
1961
1962 i = to_fc_internal(shost->transportt);
1963
1964 return &i->t.host_attrs.ac == cont;
1965 }
1966
1967 static int fc_target_match(struct attribute_container *cont,
1968 struct device *dev)
1969 {
1970 struct Scsi_Host *shost;
1971 struct fc_internal *i;
1972
1973 if (!scsi_is_target_device(dev))
1974 return 0;
1975
1976 shost = dev_to_shost(dev->parent);
1977 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1978 != &fc_host_class.class)
1979 return 0;
1980
1981 i = to_fc_internal(shost->transportt);
1982
1983 return &i->t.target_attrs.ac == cont;
1984 }
1985
1986 static void fc_rport_dev_release(struct device *dev)
1987 {
1988 struct fc_rport *rport = dev_to_rport(dev);
1989 put_device(dev->parent);
1990 kfree(rport);
1991 }
1992
1993 int scsi_is_fc_rport(const struct device *dev)
1994 {
1995 return dev->release == fc_rport_dev_release;
1996 }
1997 EXPORT_SYMBOL(scsi_is_fc_rport);
1998
1999 static int fc_rport_match(struct attribute_container *cont,
2000 struct device *dev)
2001 {
2002 struct Scsi_Host *shost;
2003 struct fc_internal *i;
2004
2005 if (!scsi_is_fc_rport(dev))
2006 return 0;
2007
2008 shost = dev_to_shost(dev->parent);
2009 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2010 != &fc_host_class.class)
2011 return 0;
2012
2013 i = to_fc_internal(shost->transportt);
2014
2015 return &i->rport_attr_cont.ac == cont;
2016 }
2017
2018
2019 static void fc_vport_dev_release(struct device *dev)
2020 {
2021 struct fc_vport *vport = dev_to_vport(dev);
2022 put_device(dev->parent); /* release kobj parent */
2023 kfree(vport);
2024 }
2025
2026 int scsi_is_fc_vport(const struct device *dev)
2027 {
2028 return dev->release == fc_vport_dev_release;
2029 }
2030 EXPORT_SYMBOL(scsi_is_fc_vport);
2031
2032 static int fc_vport_match(struct attribute_container *cont,
2033 struct device *dev)
2034 {
2035 struct fc_vport *vport;
2036 struct Scsi_Host *shost;
2037 struct fc_internal *i;
2038
2039 if (!scsi_is_fc_vport(dev))
2040 return 0;
2041 vport = dev_to_vport(dev);
2042
2043 shost = vport_to_shost(vport);
2044 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2045 != &fc_host_class.class)
2046 return 0;
2047
2048 i = to_fc_internal(shost->transportt);
2049 return &i->vport_attr_cont.ac == cont;
2050 }
2051
2052
2053 /**
2054 * fc_timed_out - FC Transport I/O timeout intercept handler
2055 * @scmd: The SCSI command which timed out
2056 *
2057 * This routine protects against error handlers getting invoked while a
2058 * rport is in a blocked state, typically due to a temporarily loss of
2059 * connectivity. If the error handlers are allowed to proceed, requests
2060 * to abort i/o, reset the target, etc will likely fail as there is no way
2061 * to communicate with the device to perform the requested function. These
2062 * failures may result in the midlayer taking the device offline, requiring
2063 * manual intervention to restore operation.
2064 *
2065 * This routine, called whenever an i/o times out, validates the state of
2066 * the underlying rport. If the rport is blocked, it returns
2067 * EH_RESET_TIMER, which will continue to reschedule the timeout.
2068 * Eventually, either the device will return, or devloss_tmo will fire,
2069 * and when the timeout then fires, it will be handled normally.
2070 * If the rport is not blocked, normal error handling continues.
2071 *
2072 * Notes:
2073 * This routine assumes no locks are held on entry.
2074 */
2075 static enum blk_eh_timer_return
2076 fc_timed_out(struct scsi_cmnd *scmd)
2077 {
2078 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2079
2080 if (rport->port_state == FC_PORTSTATE_BLOCKED)
2081 return BLK_EH_RESET_TIMER;
2082
2083 return BLK_EH_NOT_HANDLED;
2084 }
2085
2086 /*
2087 * Called by fc_user_scan to locate an rport on the shost that
2088 * matches the channel and target id, and invoke scsi_scan_target()
2089 * on the rport.
2090 */
2091 static void
2092 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2093 {
2094 struct fc_rport *rport;
2095 unsigned long flags;
2096
2097 spin_lock_irqsave(shost->host_lock, flags);
2098
2099 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2100 if (rport->scsi_target_id == -1)
2101 continue;
2102
2103 if (rport->port_state != FC_PORTSTATE_ONLINE)
2104 continue;
2105
2106 if ((channel == rport->channel) &&
2107 (id == rport->scsi_target_id)) {
2108 spin_unlock_irqrestore(shost->host_lock, flags);
2109 scsi_scan_target(&rport->dev, channel, id, lun, 1);
2110 return;
2111 }
2112 }
2113
2114 spin_unlock_irqrestore(shost->host_lock, flags);
2115 }
2116
2117 /*
2118 * Called via sysfs scan routines. Necessary, as the FC transport
2119 * wants to place all target objects below the rport object. So this
2120 * routine must invoke the scsi_scan_target() routine with the rport
2121 * object as the parent.
2122 */
2123 static int
2124 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2125 {
2126 uint chlo, chhi;
2127 uint tgtlo, tgthi;
2128
2129 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2130 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2131 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2132 return -EINVAL;
2133
2134 if (channel == SCAN_WILD_CARD) {
2135 chlo = 0;
2136 chhi = shost->max_channel + 1;
2137 } else {
2138 chlo = channel;
2139 chhi = channel + 1;
2140 }
2141
2142 if (id == SCAN_WILD_CARD) {
2143 tgtlo = 0;
2144 tgthi = shost->max_id;
2145 } else {
2146 tgtlo = id;
2147 tgthi = id + 1;
2148 }
2149
2150 for ( ; chlo < chhi; chlo++)
2151 for ( ; tgtlo < tgthi; tgtlo++)
2152 fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2153
2154 return 0;
2155 }
2156
2157 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2158 int result)
2159 {
2160 struct fc_internal *i = to_fc_internal(shost->transportt);
2161 return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2162 }
2163
2164 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2165 {
2166 struct fc_internal *i = to_fc_internal(shost->transportt);
2167 return i->f->it_nexus_response(shost, nexus, result);
2168 }
2169
2170 struct scsi_transport_template *
2171 fc_attach_transport(struct fc_function_template *ft)
2172 {
2173 int count;
2174 struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2175 GFP_KERNEL);
2176
2177 if (unlikely(!i))
2178 return NULL;
2179
2180 i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2181 i->t.target_attrs.ac.class = &fc_transport_class.class;
2182 i->t.target_attrs.ac.match = fc_target_match;
2183 i->t.target_size = sizeof(struct fc_starget_attrs);
2184 transport_container_register(&i->t.target_attrs);
2185
2186 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2187 i->t.host_attrs.ac.class = &fc_host_class.class;
2188 i->t.host_attrs.ac.match = fc_host_match;
2189 i->t.host_size = sizeof(struct fc_host_attrs);
2190 if (ft->get_fc_host_stats)
2191 i->t.host_attrs.statistics = &fc_statistics_group;
2192 transport_container_register(&i->t.host_attrs);
2193
2194 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2195 i->rport_attr_cont.ac.class = &fc_rport_class.class;
2196 i->rport_attr_cont.ac.match = fc_rport_match;
2197 transport_container_register(&i->rport_attr_cont);
2198
2199 i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2200 i->vport_attr_cont.ac.class = &fc_vport_class.class;
2201 i->vport_attr_cont.ac.match = fc_vport_match;
2202 transport_container_register(&i->vport_attr_cont);
2203
2204 i->f = ft;
2205
2206 /* Transport uses the shost workq for scsi scanning */
2207 i->t.create_work_queue = 1;
2208
2209 i->t.eh_timed_out = fc_timed_out;
2210
2211 i->t.user_scan = fc_user_scan;
2212
2213 /* target-mode drivers' functions */
2214 i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2215 i->t.it_nexus_response = fc_it_nexus_response;
2216
2217 /*
2218 * Setup SCSI Target Attributes.
2219 */
2220 count = 0;
2221 SETUP_STARGET_ATTRIBUTE_RD(node_name);
2222 SETUP_STARGET_ATTRIBUTE_RD(port_name);
2223 SETUP_STARGET_ATTRIBUTE_RD(port_id);
2224
2225 BUG_ON(count > FC_STARGET_NUM_ATTRS);
2226
2227 i->starget_attrs[count] = NULL;
2228
2229
2230 /*
2231 * Setup SCSI Host Attributes.
2232 */
2233 count=0;
2234 SETUP_HOST_ATTRIBUTE_RD(node_name);
2235 SETUP_HOST_ATTRIBUTE_RD(port_name);
2236 SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2237 SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2238 SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2239 SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2240 SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2241 if (ft->vport_create) {
2242 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2243 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2244 }
2245 SETUP_HOST_ATTRIBUTE_RD(serial_number);
2246 SETUP_HOST_ATTRIBUTE_RD(manufacturer);
2247 SETUP_HOST_ATTRIBUTE_RD(model);
2248 SETUP_HOST_ATTRIBUTE_RD(model_description);
2249 SETUP_HOST_ATTRIBUTE_RD(hardware_version);
2250 SETUP_HOST_ATTRIBUTE_RD(driver_version);
2251 SETUP_HOST_ATTRIBUTE_RD(firmware_version);
2252 SETUP_HOST_ATTRIBUTE_RD(optionrom_version);
2253
2254 SETUP_HOST_ATTRIBUTE_RD(port_id);
2255 SETUP_HOST_ATTRIBUTE_RD(port_type);
2256 SETUP_HOST_ATTRIBUTE_RD(port_state);
2257 SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2258 SETUP_HOST_ATTRIBUTE_RD(speed);
2259 SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2260 SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2261 SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2262
2263 /* Transport-managed attributes */
2264 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2265 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2266 if (ft->issue_fc_host_lip)
2267 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2268 if (ft->vport_create)
2269 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2270 if (ft->vport_delete)
2271 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2272
2273 BUG_ON(count > FC_HOST_NUM_ATTRS);
2274
2275 i->host_attrs[count] = NULL;
2276
2277 /*
2278 * Setup Remote Port Attributes.
2279 */
2280 count=0;
2281 SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2282 SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2283 SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2284 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2285 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2286 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2287 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2288 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2289 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2290 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2291
2292 BUG_ON(count > FC_RPORT_NUM_ATTRS);
2293
2294 i->rport_attrs[count] = NULL;
2295
2296 /*
2297 * Setup Virtual Port Attributes.
2298 */
2299 count=0;
2300 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2301 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2302 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2303 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2304 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2305 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2306 SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2307 SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2308 SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2309
2310 BUG_ON(count > FC_VPORT_NUM_ATTRS);
2311
2312 i->vport_attrs[count] = NULL;
2313
2314 return &i->t;
2315 }
2316 EXPORT_SYMBOL(fc_attach_transport);
2317
2318 void fc_release_transport(struct scsi_transport_template *t)
2319 {
2320 struct fc_internal *i = to_fc_internal(t);
2321
2322 transport_container_unregister(&i->t.target_attrs);
2323 transport_container_unregister(&i->t.host_attrs);
2324 transport_container_unregister(&i->rport_attr_cont);
2325 transport_container_unregister(&i->vport_attr_cont);
2326
2327 kfree(i);
2328 }
2329 EXPORT_SYMBOL(fc_release_transport);
2330
2331 /**
2332 * fc_queue_work - Queue work to the fc_host workqueue.
2333 * @shost: Pointer to Scsi_Host bound to fc_host.
2334 * @work: Work to queue for execution.
2335 *
2336 * Return value:
2337 * 1 - work queued for execution
2338 * 0 - work is already queued
2339 * -EINVAL - work queue doesn't exist
2340 */
2341 static int
2342 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2343 {
2344 if (unlikely(!fc_host_work_q(shost))) {
2345 printk(KERN_ERR
2346 "ERROR: FC host '%s' attempted to queue work, "
2347 "when no workqueue created.\n", shost->hostt->name);
2348 dump_stack();
2349
2350 return -EINVAL;
2351 }
2352
2353 return queue_work(fc_host_work_q(shost), work);
2354 }
2355
2356 /**
2357 * fc_flush_work - Flush a fc_host's workqueue.
2358 * @shost: Pointer to Scsi_Host bound to fc_host.
2359 */
2360 static void
2361 fc_flush_work(struct Scsi_Host *shost)
2362 {
2363 if (!fc_host_work_q(shost)) {
2364 printk(KERN_ERR
2365 "ERROR: FC host '%s' attempted to flush work, "
2366 "when no workqueue created.\n", shost->hostt->name);
2367 dump_stack();
2368 return;
2369 }
2370
2371 flush_workqueue(fc_host_work_q(shost));
2372 }
2373
2374 /**
2375 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2376 * @shost: Pointer to Scsi_Host bound to fc_host.
2377 * @work: Work to queue for execution.
2378 * @delay: jiffies to delay the work queuing
2379 *
2380 * Return value:
2381 * 1 on success / 0 already queued / < 0 for error
2382 */
2383 static int
2384 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2385 unsigned long delay)
2386 {
2387 if (unlikely(!fc_host_devloss_work_q(shost))) {
2388 printk(KERN_ERR
2389 "ERROR: FC host '%s' attempted to queue work, "
2390 "when no workqueue created.\n", shost->hostt->name);
2391 dump_stack();
2392
2393 return -EINVAL;
2394 }
2395
2396 return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2397 }
2398
2399 /**
2400 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2401 * @shost: Pointer to Scsi_Host bound to fc_host.
2402 */
2403 static void
2404 fc_flush_devloss(struct Scsi_Host *shost)
2405 {
2406 if (!fc_host_devloss_work_q(shost)) {
2407 printk(KERN_ERR
2408 "ERROR: FC host '%s' attempted to flush work, "
2409 "when no workqueue created.\n", shost->hostt->name);
2410 dump_stack();
2411 return;
2412 }
2413
2414 flush_workqueue(fc_host_devloss_work_q(shost));
2415 }
2416
2417
2418 /**
2419 * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2420 * @shost: Which &Scsi_Host
2421 *
2422 * This routine is expected to be called immediately preceding the
2423 * a driver's call to scsi_remove_host().
2424 *
2425 * WARNING: A driver utilizing the fc_transport, which fails to call
2426 * this routine prior to scsi_remove_host(), will leave dangling
2427 * objects in /sys/class/fc_remote_ports. Access to any of these
2428 * objects can result in a system crash !!!
2429 *
2430 * Notes:
2431 * This routine assumes no locks are held on entry.
2432 */
2433 void
2434 fc_remove_host(struct Scsi_Host *shost)
2435 {
2436 struct fc_vport *vport = NULL, *next_vport = NULL;
2437 struct fc_rport *rport = NULL, *next_rport = NULL;
2438 struct workqueue_struct *work_q;
2439 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2440 unsigned long flags;
2441
2442 spin_lock_irqsave(shost->host_lock, flags);
2443
2444 /* Remove any vports */
2445 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2446 fc_queue_work(shost, &vport->vport_delete_work);
2447
2448 /* Remove any remote ports */
2449 list_for_each_entry_safe(rport, next_rport,
2450 &fc_host->rports, peers) {
2451 list_del(&rport->peers);
2452 rport->port_state = FC_PORTSTATE_DELETED;
2453 fc_queue_work(shost, &rport->rport_delete_work);
2454 }
2455
2456 list_for_each_entry_safe(rport, next_rport,
2457 &fc_host->rport_bindings, peers) {
2458 list_del(&rport->peers);
2459 rport->port_state = FC_PORTSTATE_DELETED;
2460 fc_queue_work(shost, &rport->rport_delete_work);
2461 }
2462
2463 spin_unlock_irqrestore(shost->host_lock, flags);
2464
2465 /* flush all scan work items */
2466 scsi_flush_work(shost);
2467
2468 /* flush all stgt delete, and rport delete work items, then kill it */
2469 if (fc_host->work_q) {
2470 work_q = fc_host->work_q;
2471 fc_host->work_q = NULL;
2472 destroy_workqueue(work_q);
2473 }
2474
2475 /* flush all devloss work items, then kill it */
2476 if (fc_host->devloss_work_q) {
2477 work_q = fc_host->devloss_work_q;
2478 fc_host->devloss_work_q = NULL;
2479 destroy_workqueue(work_q);
2480 }
2481 }
2482 EXPORT_SYMBOL(fc_remove_host);
2483
2484 static void fc_terminate_rport_io(struct fc_rport *rport)
2485 {
2486 struct Scsi_Host *shost = rport_to_shost(rport);
2487 struct fc_internal *i = to_fc_internal(shost->transportt);
2488
2489 /* Involve the LLDD if possible to terminate all io on the rport. */
2490 if (i->f->terminate_rport_io)
2491 i->f->terminate_rport_io(rport);
2492
2493 /*
2494 * Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
2495 */
2496 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
2497 }
2498
2499 /**
2500 * fc_starget_delete - called to delete the scsi descendants of an rport
2501 * @work: remote port to be operated on.
2502 *
2503 * Deletes target and all sdevs.
2504 */
2505 static void
2506 fc_starget_delete(struct work_struct *work)
2507 {
2508 struct fc_rport *rport =
2509 container_of(work, struct fc_rport, stgt_delete_work);
2510
2511 fc_terminate_rport_io(rport);
2512 scsi_remove_target(&rport->dev);
2513 }
2514
2515
2516 /**
2517 * fc_rport_final_delete - finish rport termination and delete it.
2518 * @work: remote port to be deleted.
2519 */
2520 static void
2521 fc_rport_final_delete(struct work_struct *work)
2522 {
2523 struct fc_rport *rport =
2524 container_of(work, struct fc_rport, rport_delete_work);
2525 struct device *dev = &rport->dev;
2526 struct Scsi_Host *shost = rport_to_shost(rport);
2527 struct fc_internal *i = to_fc_internal(shost->transportt);
2528 unsigned long flags;
2529 int do_callback = 0;
2530
2531 fc_terminate_rport_io(rport);
2532
2533 /*
2534 * if a scan is pending, flush the SCSI Host work_q so that
2535 * that we can reclaim the rport scan work element.
2536 */
2537 if (rport->flags & FC_RPORT_SCAN_PENDING)
2538 scsi_flush_work(shost);
2539
2540 /*
2541 * Cancel any outstanding timers. These should really exist
2542 * only when rmmod'ing the LLDD and we're asking for
2543 * immediate termination of the rports
2544 */
2545 spin_lock_irqsave(shost->host_lock, flags);
2546 if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2547 spin_unlock_irqrestore(shost->host_lock, flags);
2548 if (!cancel_delayed_work(&rport->fail_io_work))
2549 fc_flush_devloss(shost);
2550 if (!cancel_delayed_work(&rport->dev_loss_work))
2551 fc_flush_devloss(shost);
2552 cancel_work_sync(&rport->scan_work);
2553 spin_lock_irqsave(shost->host_lock, flags);
2554 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2555 }
2556 spin_unlock_irqrestore(shost->host_lock, flags);
2557
2558 /* Delete SCSI target and sdevs */
2559 if (rport->scsi_target_id != -1)
2560 fc_starget_delete(&rport->stgt_delete_work);
2561
2562 /*
2563 * Notify the driver that the rport is now dead. The LLDD will
2564 * also guarantee that any communication to the rport is terminated
2565 *
2566 * Avoid this call if we already called it when we preserved the
2567 * rport for the binding.
2568 */
2569 spin_lock_irqsave(shost->host_lock, flags);
2570 if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2571 (i->f->dev_loss_tmo_callbk)) {
2572 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2573 do_callback = 1;
2574 }
2575 spin_unlock_irqrestore(shost->host_lock, flags);
2576
2577 if (do_callback)
2578 i->f->dev_loss_tmo_callbk(rport);
2579
2580 fc_bsg_remove(rport->rqst_q);
2581
2582 transport_remove_device(dev);
2583 device_del(dev);
2584 transport_destroy_device(dev);
2585 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2586 put_device(dev); /* for self-reference */
2587 }
2588
2589
2590 /**
2591 * fc_rport_create - allocates and creates a remote FC port.
2592 * @shost: scsi host the remote port is connected to.
2593 * @channel: Channel on shost port connected to.
2594 * @ids: The world wide names, fc address, and FC4 port
2595 * roles for the remote port.
2596 *
2597 * Allocates and creates the remoter port structure, including the
2598 * class and sysfs creation.
2599 *
2600 * Notes:
2601 * This routine assumes no locks are held on entry.
2602 */
2603 static struct fc_rport *
2604 fc_rport_create(struct Scsi_Host *shost, int channel,
2605 struct fc_rport_identifiers *ids)
2606 {
2607 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2608 struct fc_internal *fci = to_fc_internal(shost->transportt);
2609 struct fc_rport *rport;
2610 struct device *dev;
2611 unsigned long flags;
2612 int error;
2613 size_t size;
2614
2615 size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2616 rport = kzalloc(size, GFP_KERNEL);
2617 if (unlikely(!rport)) {
2618 printk(KERN_ERR "%s: allocation failure\n", __func__);
2619 return NULL;
2620 }
2621
2622 rport->maxframe_size = -1;
2623 rport->supported_classes = FC_COS_UNSPECIFIED;
2624 rport->dev_loss_tmo = fc_host->dev_loss_tmo;
2625 memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2626 memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2627 rport->port_id = ids->port_id;
2628 rport->roles = ids->roles;
2629 rport->port_state = FC_PORTSTATE_ONLINE;
2630 if (fci->f->dd_fcrport_size)
2631 rport->dd_data = &rport[1];
2632 rport->channel = channel;
2633 rport->fast_io_fail_tmo = -1;
2634
2635 INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2636 INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2637 INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2638 INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2639 INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2640
2641 spin_lock_irqsave(shost->host_lock, flags);
2642
2643 rport->number = fc_host->next_rport_number++;
2644 if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2645 rport->scsi_target_id = fc_host->next_target_id++;
2646 else
2647 rport->scsi_target_id = -1;
2648 list_add_tail(&rport->peers, &fc_host->rports);
2649 get_device(&shost->shost_gendev); /* for fc_host->rport list */
2650
2651 spin_unlock_irqrestore(shost->host_lock, flags);
2652
2653 dev = &rport->dev;
2654 device_initialize(dev); /* takes self reference */
2655 dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2656 dev->release = fc_rport_dev_release;
2657 dev_set_name(dev, "rport-%d:%d-%d",
2658 shost->host_no, channel, rport->number);
2659 transport_setup_device(dev);
2660
2661 error = device_add(dev);
2662 if (error) {
2663 printk(KERN_ERR "FC Remote Port device_add failed\n");
2664 goto delete_rport;
2665 }
2666 transport_add_device(dev);
2667 transport_configure_device(dev);
2668
2669 fc_bsg_rportadd(shost, rport);
2670 /* ignore any bsg add error - we just can't do sgio */
2671
2672 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2673 /* initiate a scan of the target */
2674 rport->flags |= FC_RPORT_SCAN_PENDING;
2675 scsi_queue_work(shost, &rport->scan_work);
2676 }
2677
2678 return rport;
2679
2680 delete_rport:
2681 transport_destroy_device(dev);
2682 spin_lock_irqsave(shost->host_lock, flags);
2683 list_del(&rport->peers);
2684 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2685 spin_unlock_irqrestore(shost->host_lock, flags);
2686 put_device(dev->parent);
2687 kfree(rport);
2688 return NULL;
2689 }
2690
2691 /**
2692 * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2693 * @shost: scsi host the remote port is connected to.
2694 * @channel: Channel on shost port connected to.
2695 * @ids: The world wide names, fc address, and FC4 port
2696 * roles for the remote port.
2697 *
2698 * The LLDD calls this routine to notify the transport of the existence
2699 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2700 * of the port, it's FC address (port_id), and the FC4 roles that are
2701 * active for the port.
2702 *
2703 * For ports that are FCP targets (aka scsi targets), the FC transport
2704 * maintains consistent target id bindings on behalf of the LLDD.
2705 * A consistent target id binding is an assignment of a target id to
2706 * a remote port identifier, which persists while the scsi host is
2707 * attached. The remote port can disappear, then later reappear, and
2708 * it's target id assignment remains the same. This allows for shifts
2709 * in FC addressing (if binding by wwpn or wwnn) with no apparent
2710 * changes to the scsi subsystem which is based on scsi host number and
2711 * target id values. Bindings are only valid during the attachment of
2712 * the scsi host. If the host detaches, then later re-attaches, target
2713 * id bindings may change.
2714 *
2715 * This routine is responsible for returning a remote port structure.
2716 * The routine will search the list of remote ports it maintains
2717 * internally on behalf of consistent target id mappings. If found, the
2718 * remote port structure will be reused. Otherwise, a new remote port
2719 * structure will be allocated.
2720 *
2721 * Whenever a remote port is allocated, a new fc_remote_port class
2722 * device is created.
2723 *
2724 * Should not be called from interrupt context.
2725 *
2726 * Notes:
2727 * This routine assumes no locks are held on entry.
2728 */
2729 struct fc_rport *
2730 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2731 struct fc_rport_identifiers *ids)
2732 {
2733 struct fc_internal *fci = to_fc_internal(shost->transportt);
2734 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2735 struct fc_rport *rport;
2736 unsigned long flags;
2737 int match = 0;
2738
2739 /* ensure any stgt delete functions are done */
2740 fc_flush_work(shost);
2741
2742 /*
2743 * Search the list of "active" rports, for an rport that has been
2744 * deleted, but we've held off the real delete while the target
2745 * is in a "blocked" state.
2746 */
2747 spin_lock_irqsave(shost->host_lock, flags);
2748
2749 list_for_each_entry(rport, &fc_host->rports, peers) {
2750
2751 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2752 (rport->channel == channel)) {
2753
2754 switch (fc_host->tgtid_bind_type) {
2755 case FC_TGTID_BIND_BY_WWPN:
2756 case FC_TGTID_BIND_NONE:
2757 if (rport->port_name == ids->port_name)
2758 match = 1;
2759 break;
2760 case FC_TGTID_BIND_BY_WWNN:
2761 if (rport->node_name == ids->node_name)
2762 match = 1;
2763 break;
2764 case FC_TGTID_BIND_BY_ID:
2765 if (rport->port_id == ids->port_id)
2766 match = 1;
2767 break;
2768 }
2769
2770 if (match) {
2771
2772 memcpy(&rport->node_name, &ids->node_name,
2773 sizeof(rport->node_name));
2774 memcpy(&rport->port_name, &ids->port_name,
2775 sizeof(rport->port_name));
2776 rport->port_id = ids->port_id;
2777
2778 rport->port_state = FC_PORTSTATE_ONLINE;
2779 rport->roles = ids->roles;
2780
2781 spin_unlock_irqrestore(shost->host_lock, flags);
2782
2783 if (fci->f->dd_fcrport_size)
2784 memset(rport->dd_data, 0,
2785 fci->f->dd_fcrport_size);
2786
2787 /*
2788 * If we were not a target, cancel the
2789 * io terminate and rport timers, and
2790 * we're done.
2791 *
2792 * If we were a target, but our new role
2793 * doesn't indicate a target, leave the
2794 * timers running expecting the role to
2795 * change as the target fully logs in. If
2796 * it doesn't, the target will be torn down.
2797 *
2798 * If we were a target, and our role shows
2799 * we're still a target, cancel the timers
2800 * and kick off a scan.
2801 */
2802
2803 /* was a target, not in roles */
2804 if ((rport->scsi_target_id != -1) &&
2805 (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2806 return rport;
2807
2808 /*
2809 * Stop the fail io and dev_loss timers.
2810 * If they flush, the port_state will
2811 * be checked and will NOOP the function.
2812 */
2813 if (!cancel_delayed_work(&rport->fail_io_work))
2814 fc_flush_devloss(shost);
2815 if (!cancel_delayed_work(&rport->dev_loss_work))
2816 fc_flush_devloss(shost);
2817
2818 spin_lock_irqsave(shost->host_lock, flags);
2819
2820 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2821 FC_RPORT_DEVLOSS_PENDING |
2822 FC_RPORT_DEVLOSS_CALLBK_DONE);
2823
2824 spin_unlock_irqrestore(shost->host_lock, flags);
2825
2826 /* if target, initiate a scan */
2827 if (rport->scsi_target_id != -1) {
2828 scsi_target_unblock(&rport->dev,
2829 SDEV_RUNNING);
2830 spin_lock_irqsave(shost->host_lock,
2831 flags);
2832 rport->flags |= FC_RPORT_SCAN_PENDING;
2833 scsi_queue_work(shost,
2834 &rport->scan_work);
2835 spin_unlock_irqrestore(shost->host_lock,
2836 flags);
2837 }
2838
2839 fc_bsg_goose_queue(rport);
2840
2841 return rport;
2842 }
2843 }
2844 }
2845
2846 /*
2847 * Search the bindings array
2848 * Note: if never a FCP target, you won't be on this list
2849 */
2850 if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2851
2852 /* search for a matching consistent binding */
2853
2854 list_for_each_entry(rport, &fc_host->rport_bindings,
2855 peers) {
2856 if (rport->channel != channel)
2857 continue;
2858
2859 switch (fc_host->tgtid_bind_type) {
2860 case FC_TGTID_BIND_BY_WWPN:
2861 if (rport->port_name == ids->port_name)
2862 match = 1;
2863 break;
2864 case FC_TGTID_BIND_BY_WWNN:
2865 if (rport->node_name == ids->node_name)
2866 match = 1;
2867 break;
2868 case FC_TGTID_BIND_BY_ID:
2869 if (rport->port_id == ids->port_id)
2870 match = 1;
2871 break;
2872 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2873 break;
2874 }
2875
2876 if (match) {
2877 list_move_tail(&rport->peers, &fc_host->rports);
2878 break;
2879 }
2880 }
2881
2882 if (match) {
2883 memcpy(&rport->node_name, &ids->node_name,
2884 sizeof(rport->node_name));
2885 memcpy(&rport->port_name, &ids->port_name,
2886 sizeof(rport->port_name));
2887 rport->port_id = ids->port_id;
2888 rport->roles = ids->roles;
2889 rport->port_state = FC_PORTSTATE_ONLINE;
2890 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2891
2892 if (fci->f->dd_fcrport_size)
2893 memset(rport->dd_data, 0,
2894 fci->f->dd_fcrport_size);
2895 spin_unlock_irqrestore(shost->host_lock, flags);
2896
2897 if (ids->roles & FC_PORT_ROLE_FCP_TARGET) {
2898 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
2899
2900 /* initiate a scan of the target */
2901 spin_lock_irqsave(shost->host_lock, flags);
2902 rport->flags |= FC_RPORT_SCAN_PENDING;
2903 scsi_queue_work(shost, &rport->scan_work);
2904 spin_unlock_irqrestore(shost->host_lock, flags);
2905 }
2906 return rport;
2907 }
2908 }
2909
2910 spin_unlock_irqrestore(shost->host_lock, flags);
2911
2912 /* No consistent binding found - create new remote port entry */
2913 rport = fc_rport_create(shost, channel, ids);
2914
2915 return rport;
2916 }
2917 EXPORT_SYMBOL(fc_remote_port_add);
2918
2919
2920 /**
2921 * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2922 * @rport: The remote port that no longer exists
2923 *
2924 * The LLDD calls this routine to notify the transport that a remote
2925 * port is no longer part of the topology. Note: Although a port
2926 * may no longer be part of the topology, it may persist in the remote
2927 * ports displayed by the fc_host. We do this under 2 conditions:
2928 * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2929 * This allows the port to temporarily disappear, then reappear without
2930 * disrupting the SCSI device tree attached to it. During the "blocked"
2931 * period the port will still exist.
2932 * 2) If the port was a scsi target and disappears for longer than we
2933 * expect, we'll delete the port and the tear down the SCSI device tree
2934 * attached to it. However, we want to semi-persist the target id assigned
2935 * to that port if it eventually does exist. The port structure will
2936 * remain (although with minimal information) so that the target id
2937 * bindings remails.
2938 *
2939 * If the remote port is not an FCP Target, it will be fully torn down
2940 * and deallocated, including the fc_remote_port class device.
2941 *
2942 * If the remote port is an FCP Target, the port will be placed in a
2943 * temporary blocked state. From the LLDD's perspective, the rport no
2944 * longer exists. From the SCSI midlayer's perspective, the SCSI target
2945 * exists, but all sdevs on it are blocked from further I/O. The following
2946 * is then expected.
2947 *
2948 * If the remote port does not return (signaled by a LLDD call to
2949 * fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2950 * scsi target is removed - killing all outstanding i/o and removing the
2951 * scsi devices attached ot it. The port structure will be marked Not
2952 * Present and be partially cleared, leaving only enough information to
2953 * recognize the remote port relative to the scsi target id binding if
2954 * it later appears. The port will remain as long as there is a valid
2955 * binding (e.g. until the user changes the binding type or unloads the
2956 * scsi host with the binding).
2957 *
2958 * If the remote port returns within the dev_loss_tmo value (and matches
2959 * according to the target id binding type), the port structure will be
2960 * reused. If it is no longer a SCSI target, the target will be torn
2961 * down. If it continues to be a SCSI target, then the target will be
2962 * unblocked (allowing i/o to be resumed), and a scan will be activated
2963 * to ensure that all luns are detected.
2964 *
2965 * Called from normal process context only - cannot be called from interrupt.
2966 *
2967 * Notes:
2968 * This routine assumes no locks are held on entry.
2969 */
2970 void
2971 fc_remote_port_delete(struct fc_rport *rport)
2972 {
2973 struct Scsi_Host *shost = rport_to_shost(rport);
2974 unsigned long timeout = rport->dev_loss_tmo;
2975 unsigned long flags;
2976
2977 /*
2978 * No need to flush the fc_host work_q's, as all adds are synchronous.
2979 *
2980 * We do need to reclaim the rport scan work element, so eventually
2981 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2982 * there's still a scan pending.
2983 */
2984
2985 spin_lock_irqsave(shost->host_lock, flags);
2986
2987 if (rport->port_state != FC_PORTSTATE_ONLINE) {
2988 spin_unlock_irqrestore(shost->host_lock, flags);
2989 return;
2990 }
2991
2992 /*
2993 * In the past, we if this was not an FCP-Target, we would
2994 * unconditionally just jump to deleting the rport.
2995 * However, rports can be used as node containers by the LLDD,
2996 * and its not appropriate to just terminate the rport at the
2997 * first sign of a loss in connectivity. The LLDD may want to
2998 * send ELS traffic to re-validate the login. If the rport is
2999 * immediately deleted, it makes it inappropriate for a node
3000 * container.
3001 * So... we now unconditionally wait dev_loss_tmo before
3002 * destroying an rport.
3003 */
3004
3005 rport->port_state = FC_PORTSTATE_BLOCKED;
3006
3007 rport->flags |= FC_RPORT_DEVLOSS_PENDING;
3008
3009 spin_unlock_irqrestore(shost->host_lock, flags);
3010
3011 if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
3012 shost->active_mode & MODE_TARGET)
3013 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
3014
3015 scsi_target_block(&rport->dev);
3016
3017 /* see if we need to kill io faster than waiting for device loss */
3018 if ((rport->fast_io_fail_tmo != -1) &&
3019 (rport->fast_io_fail_tmo < timeout))
3020 fc_queue_devloss_work(shost, &rport->fail_io_work,
3021 rport->fast_io_fail_tmo * HZ);
3022
3023 /* cap the length the devices can be blocked until they are deleted */
3024 fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
3025 }
3026 EXPORT_SYMBOL(fc_remote_port_delete);
3027
3028 /**
3029 * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
3030 * @rport: The remote port that changed.
3031 * @roles: New roles for this port.
3032 *
3033 * Description: The LLDD calls this routine to notify the transport that the
3034 * roles on a remote port may have changed. The largest effect of this is
3035 * if a port now becomes a FCP Target, it must be allocated a
3036 * scsi target id. If the port is no longer a FCP target, any
3037 * scsi target id value assigned to it will persist in case the
3038 * role changes back to include FCP Target. No changes in the scsi
3039 * midlayer will be invoked if the role changes (in the expectation
3040 * that the role will be resumed. If it doesn't normal error processing
3041 * will take place).
3042 *
3043 * Should not be called from interrupt context.
3044 *
3045 * Notes:
3046 * This routine assumes no locks are held on entry.
3047 */
3048 void
3049 fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
3050 {
3051 struct Scsi_Host *shost = rport_to_shost(rport);
3052 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3053 unsigned long flags;
3054 int create = 0;
3055 int ret;
3056
3057 spin_lock_irqsave(shost->host_lock, flags);
3058 if (roles & FC_PORT_ROLE_FCP_TARGET) {
3059 if (rport->scsi_target_id == -1) {
3060 rport->scsi_target_id = fc_host->next_target_id++;
3061 create = 1;
3062 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3063 create = 1;
3064 } else if (shost->active_mode & MODE_TARGET) {
3065 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
3066 (char *)&rport->node_name);
3067 if (ret)
3068 printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
3069 ret);
3070 }
3071
3072 rport->roles = roles;
3073
3074 spin_unlock_irqrestore(shost->host_lock, flags);
3075
3076 if (create) {
3077 /*
3078 * There may have been a delete timer running on the
3079 * port. Ensure that it is cancelled as we now know
3080 * the port is an FCP Target.
3081 * Note: we know the rport is exists and in an online
3082 * state as the LLDD would not have had an rport
3083 * reference to pass us.
3084 *
3085 * Take no action on the del_timer failure as the state
3086 * machine state change will validate the
3087 * transaction.
3088 */
3089 if (!cancel_delayed_work(&rport->fail_io_work))
3090 fc_flush_devloss(shost);
3091 if (!cancel_delayed_work(&rport->dev_loss_work))
3092 fc_flush_devloss(shost);
3093
3094 spin_lock_irqsave(shost->host_lock, flags);
3095 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3096 FC_RPORT_DEVLOSS_PENDING |
3097 FC_RPORT_DEVLOSS_CALLBK_DONE);
3098 spin_unlock_irqrestore(shost->host_lock, flags);
3099
3100 /* ensure any stgt delete functions are done */
3101 fc_flush_work(shost);
3102
3103 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
3104 /* initiate a scan of the target */
3105 spin_lock_irqsave(shost->host_lock, flags);
3106 rport->flags |= FC_RPORT_SCAN_PENDING;
3107 scsi_queue_work(shost, &rport->scan_work);
3108 spin_unlock_irqrestore(shost->host_lock, flags);
3109 }
3110 }
3111 EXPORT_SYMBOL(fc_remote_port_rolechg);
3112
3113 /**
3114 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3115 * @work: rport target that failed to reappear in the allotted time.
3116 *
3117 * Description: An attempt to delete a remote port blocks, and if it fails
3118 * to return in the allotted time this gets called.
3119 */
3120 static void
3121 fc_timeout_deleted_rport(struct work_struct *work)
3122 {
3123 struct fc_rport *rport =
3124 container_of(work, struct fc_rport, dev_loss_work.work);
3125 struct Scsi_Host *shost = rport_to_shost(rport);
3126 struct fc_internal *i = to_fc_internal(shost->transportt);
3127 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3128 unsigned long flags;
3129 int do_callback = 0;
3130
3131 spin_lock_irqsave(shost->host_lock, flags);
3132
3133 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3134
3135 /*
3136 * If the port is ONLINE, then it came back. If it was a SCSI
3137 * target, validate it still is. If not, tear down the
3138 * scsi_target on it.
3139 */
3140 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3141 (rport->scsi_target_id != -1) &&
3142 !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3143 dev_printk(KERN_ERR, &rport->dev,
3144 "blocked FC remote port time out: no longer"
3145 " a FCP target, removing starget\n");
3146 spin_unlock_irqrestore(shost->host_lock, flags);
3147 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
3148 fc_queue_work(shost, &rport->stgt_delete_work);
3149 return;
3150 }
3151
3152 /* NOOP state - we're flushing workq's */
3153 if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3154 spin_unlock_irqrestore(shost->host_lock, flags);
3155 dev_printk(KERN_ERR, &rport->dev,
3156 "blocked FC remote port time out: leaving"
3157 " rport%s alone\n",
3158 (rport->scsi_target_id != -1) ? " and starget" : "");
3159 return;
3160 }
3161
3162 if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3163 (rport->scsi_target_id == -1)) {
3164 list_del(&rport->peers);
3165 rport->port_state = FC_PORTSTATE_DELETED;
3166 dev_printk(KERN_ERR, &rport->dev,
3167 "blocked FC remote port time out: removing"
3168 " rport%s\n",
3169 (rport->scsi_target_id != -1) ? " and starget" : "");
3170 fc_queue_work(shost, &rport->rport_delete_work);
3171 spin_unlock_irqrestore(shost->host_lock, flags);
3172 return;
3173 }
3174
3175 dev_printk(KERN_ERR, &rport->dev,
3176 "blocked FC remote port time out: removing target and "
3177 "saving binding\n");
3178
3179 list_move_tail(&rport->peers, &fc_host->rport_bindings);
3180
3181 /*
3182 * Note: We do not remove or clear the hostdata area. This allows
3183 * host-specific target data to persist along with the
3184 * scsi_target_id. It's up to the host to manage it's hostdata area.
3185 */
3186
3187 /*
3188 * Reinitialize port attributes that may change if the port comes back.
3189 */
3190 rport->maxframe_size = -1;
3191 rport->supported_classes = FC_COS_UNSPECIFIED;
3192 rport->roles = FC_PORT_ROLE_UNKNOWN;
3193 rport->port_state = FC_PORTSTATE_NOTPRESENT;
3194 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3195
3196 /*
3197 * Pre-emptively kill I/O rather than waiting for the work queue
3198 * item to teardown the starget. (FCOE libFC folks prefer this
3199 * and to have the rport_port_id still set when it's done).
3200 */
3201 spin_unlock_irqrestore(shost->host_lock, flags);
3202 fc_terminate_rport_io(rport);
3203
3204 spin_lock_irqsave(shost->host_lock, flags);
3205
3206 if (rport->port_state == FC_PORTSTATE_NOTPRESENT) { /* still missing */
3207
3208 /* remove the identifiers that aren't used in the consisting binding */
3209 switch (fc_host->tgtid_bind_type) {
3210 case FC_TGTID_BIND_BY_WWPN:
3211 rport->node_name = -1;
3212 rport->port_id = -1;
3213 break;
3214 case FC_TGTID_BIND_BY_WWNN:
3215 rport->port_name = -1;
3216 rport->port_id = -1;
3217 break;
3218 case FC_TGTID_BIND_BY_ID:
3219 rport->node_name = -1;
3220 rport->port_name = -1;
3221 break;
3222 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3223 break;
3224 }
3225
3226 /*
3227 * As this only occurs if the remote port (scsi target)
3228 * went away and didn't come back - we'll remove
3229 * all attached scsi devices.
3230 */
3231 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3232 fc_queue_work(shost, &rport->stgt_delete_work);
3233
3234 do_callback = 1;
3235 }
3236
3237 spin_unlock_irqrestore(shost->host_lock, flags);
3238
3239 /*
3240 * Notify the driver that the rport is now dead. The LLDD will
3241 * also guarantee that any communication to the rport is terminated
3242 *
3243 * Note: we set the CALLBK_DONE flag above to correspond
3244 */
3245 if (do_callback && i->f->dev_loss_tmo_callbk)
3246 i->f->dev_loss_tmo_callbk(rport);
3247 }
3248
3249
3250 /**
3251 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3252 * @work: rport to terminate io on.
3253 *
3254 * Notes: Only requests the failure of the io, not that all are flushed
3255 * prior to returning.
3256 */
3257 static void
3258 fc_timeout_fail_rport_io(struct work_struct *work)
3259 {
3260 struct fc_rport *rport =
3261 container_of(work, struct fc_rport, fail_io_work.work);
3262
3263 if (rport->port_state != FC_PORTSTATE_BLOCKED)
3264 return;
3265
3266 rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3267 fc_terminate_rport_io(rport);
3268 }
3269
3270 /**
3271 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3272 * @work: remote port to be scanned.
3273 */
3274 static void
3275 fc_scsi_scan_rport(struct work_struct *work)
3276 {
3277 struct fc_rport *rport =
3278 container_of(work, struct fc_rport, scan_work);
3279 struct Scsi_Host *shost = rport_to_shost(rport);
3280 struct fc_internal *i = to_fc_internal(shost->transportt);
3281 unsigned long flags;
3282
3283 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3284 (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3285 !(i->f->disable_target_scan)) {
3286 scsi_scan_target(&rport->dev, rport->channel,
3287 rport->scsi_target_id, SCAN_WILD_CARD, 1);
3288 }
3289
3290 spin_lock_irqsave(shost->host_lock, flags);
3291 rport->flags &= ~FC_RPORT_SCAN_PENDING;
3292 spin_unlock_irqrestore(shost->host_lock, flags);
3293 }
3294
3295 /**
3296 * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3297 * @cmnd: SCSI command that scsi_eh is trying to recover
3298 *
3299 * This routine can be called from a FC LLD scsi_eh callback. It
3300 * blocks the scsi_eh thread until the fc_rport leaves the
3301 * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3302 * necessary to avoid the scsi_eh failing recovery actions for blocked
3303 * rports which would lead to offlined SCSI devices.
3304 *
3305 * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3306 * FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3307 * passed back to scsi_eh.
3308 */
3309 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3310 {
3311 struct Scsi_Host *shost = cmnd->device->host;
3312 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3313 unsigned long flags;
3314
3315 spin_lock_irqsave(shost->host_lock, flags);
3316 while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3317 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3318 spin_unlock_irqrestore(shost->host_lock, flags);
3319 msleep(1000);
3320 spin_lock_irqsave(shost->host_lock, flags);
3321 }
3322 spin_unlock_irqrestore(shost->host_lock, flags);
3323
3324 if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3325 return FAST_IO_FAIL;
3326
3327 return 0;
3328 }
3329 EXPORT_SYMBOL(fc_block_scsi_eh);
3330
3331 /**
3332 * fc_vport_setup - allocates and creates a FC virtual port.
3333 * @shost: scsi host the virtual port is connected to.
3334 * @channel: Channel on shost port connected to.
3335 * @pdev: parent device for vport
3336 * @ids: The world wide names, FC4 port roles, etc for
3337 * the virtual port.
3338 * @ret_vport: The pointer to the created vport.
3339 *
3340 * Allocates and creates the vport structure, calls the parent host
3341 * to instantiate the vport, the completes w/ class and sysfs creation.
3342 *
3343 * Notes:
3344 * This routine assumes no locks are held on entry.
3345 */
3346 static int
3347 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3348 struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
3349 {
3350 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3351 struct fc_internal *fci = to_fc_internal(shost->transportt);
3352 struct fc_vport *vport;
3353 struct device *dev;
3354 unsigned long flags;
3355 size_t size;
3356 int error;
3357
3358 *ret_vport = NULL;
3359
3360 if ( ! fci->f->vport_create)
3361 return -ENOENT;
3362
3363 size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3364 vport = kzalloc(size, GFP_KERNEL);
3365 if (unlikely(!vport)) {
3366 printk(KERN_ERR "%s: allocation failure\n", __func__);
3367 return -ENOMEM;
3368 }
3369
3370 vport->vport_state = FC_VPORT_UNKNOWN;
3371 vport->vport_last_state = FC_VPORT_UNKNOWN;
3372 vport->node_name = ids->node_name;
3373 vport->port_name = ids->port_name;
3374 vport->roles = ids->roles;
3375 vport->vport_type = ids->vport_type;
3376 if (fci->f->dd_fcvport_size)
3377 vport->dd_data = &vport[1];
3378 vport->shost = shost;
3379 vport->channel = channel;
3380 vport->flags = FC_VPORT_CREATING;
3381 INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3382
3383 spin_lock_irqsave(shost->host_lock, flags);
3384
3385 if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3386 spin_unlock_irqrestore(shost->host_lock, flags);
3387 kfree(vport);
3388 return -ENOSPC;
3389 }
3390 fc_host->npiv_vports_inuse++;
3391 vport->number = fc_host->next_vport_number++;
3392 list_add_tail(&vport->peers, &fc_host->vports);
3393 get_device(&shost->shost_gendev); /* for fc_host->vport list */
3394
3395 spin_unlock_irqrestore(shost->host_lock, flags);
3396
3397 dev = &vport->dev;
3398 device_initialize(dev); /* takes self reference */
3399 dev->parent = get_device(pdev); /* takes parent reference */
3400 dev->release = fc_vport_dev_release;
3401 dev_set_name(dev, "vport-%d:%d-%d",
3402 shost->host_no, channel, vport->number);
3403 transport_setup_device(dev);
3404
3405 error = device_add(dev);
3406 if (error) {
3407 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3408 goto delete_vport;
3409 }
3410 transport_add_device(dev);
3411 transport_configure_device(dev);
3412
3413 error = fci->f->vport_create(vport, ids->disable);
3414 if (error) {
3415 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3416 goto delete_vport_all;
3417 }
3418
3419 /*
3420 * if the parent isn't the physical adapter's Scsi_Host, ensure
3421 * the Scsi_Host at least contains ia symlink to the vport.
3422 */
3423 if (pdev != &shost->shost_gendev) {
3424 error = sysfs_create_link(&shost->shost_gendev.kobj,
3425 &dev->kobj, dev_name(dev));
3426 if (error)
3427 printk(KERN_ERR
3428 "%s: Cannot create vport symlinks for "
3429 "%s, err=%d\n",
3430 __func__, dev_name(dev), error);
3431 }
3432 spin_lock_irqsave(shost->host_lock, flags);
3433 vport->flags &= ~FC_VPORT_CREATING;
3434 spin_unlock_irqrestore(shost->host_lock, flags);
3435
3436 dev_printk(KERN_NOTICE, pdev,
3437 "%s created via shost%d channel %d\n", dev_name(dev),
3438 shost->host_no, channel);
3439
3440 *ret_vport = vport;
3441
3442 return 0;
3443
3444 delete_vport_all:
3445 transport_remove_device(dev);
3446 device_del(dev);
3447 delete_vport:
3448 transport_destroy_device(dev);
3449 spin_lock_irqsave(shost->host_lock, flags);
3450 list_del(&vport->peers);
3451 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3452 fc_host->npiv_vports_inuse--;
3453 spin_unlock_irqrestore(shost->host_lock, flags);
3454 put_device(dev->parent);
3455 kfree(vport);
3456
3457 return error;
3458 }
3459
3460 /**
3461 * fc_vport_create - Admin App or LLDD requests creation of a vport
3462 * @shost: scsi host the virtual port is connected to.
3463 * @channel: channel on shost port connected to.
3464 * @ids: The world wide names, FC4 port roles, etc for
3465 * the virtual port.
3466 *
3467 * Notes:
3468 * This routine assumes no locks are held on entry.
3469 */
3470 struct fc_vport *
3471 fc_vport_create(struct Scsi_Host *shost, int channel,
3472 struct fc_vport_identifiers *ids)
3473 {
3474 int stat;
3475 struct fc_vport *vport;
3476
3477 stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3478 ids, &vport);
3479 return stat ? NULL : vport;
3480 }
3481 EXPORT_SYMBOL(fc_vport_create);
3482
3483 /**
3484 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3485 * @vport: fc_vport to be terminated
3486 *
3487 * Calls the LLDD vport_delete() function, then deallocates and removes
3488 * the vport from the shost and object tree.
3489 *
3490 * Notes:
3491 * This routine assumes no locks are held on entry.
3492 */
3493 int
3494 fc_vport_terminate(struct fc_vport *vport)
3495 {
3496 struct Scsi_Host *shost = vport_to_shost(vport);
3497 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3498 struct fc_internal *i = to_fc_internal(shost->transportt);
3499 struct device *dev = &vport->dev;
3500 unsigned long flags;
3501 int stat;
3502
3503 if (i->f->vport_delete)
3504 stat = i->f->vport_delete(vport);
3505 else
3506 stat = -ENOENT;
3507
3508 spin_lock_irqsave(shost->host_lock, flags);
3509 vport->flags &= ~FC_VPORT_DELETING;
3510 if (!stat) {
3511 vport->flags |= FC_VPORT_DELETED;
3512 list_del(&vport->peers);
3513 fc_host->npiv_vports_inuse--;
3514 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3515 }
3516 spin_unlock_irqrestore(shost->host_lock, flags);
3517
3518 if (stat)
3519 return stat;
3520
3521 if (dev->parent != &shost->shost_gendev)
3522 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3523 transport_remove_device(dev);
3524 device_del(dev);
3525 transport_destroy_device(dev);
3526
3527 /*
3528 * Removing our self-reference should mean our
3529 * release function gets called, which will drop the remaining
3530 * parent reference and free the data structure.
3531 */
3532 put_device(dev); /* for self-reference */
3533
3534 return 0; /* SUCCESS */
3535 }
3536 EXPORT_SYMBOL(fc_vport_terminate);
3537
3538 /**
3539 * fc_vport_sched_delete - workq-based delete request for a vport
3540 * @work: vport to be deleted.
3541 */
3542 static void
3543 fc_vport_sched_delete(struct work_struct *work)
3544 {
3545 struct fc_vport *vport =
3546 container_of(work, struct fc_vport, vport_delete_work);
3547 int stat;
3548
3549 stat = fc_vport_terminate(vport);
3550 if (stat)
3551 dev_printk(KERN_ERR, vport->dev.parent,
3552 "%s: %s could not be deleted created via "
3553 "shost%d channel %d - error %d\n", __func__,
3554 dev_name(&vport->dev), vport->shost->host_no,
3555 vport->channel, stat);
3556 }
3557
3558
3559 /*
3560 * BSG support
3561 */
3562
3563
3564 /**
3565 * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3566 * @job: fc_bsg_job that is to be torn down
3567 */
3568 static void
3569 fc_destroy_bsgjob(struct fc_bsg_job *job)
3570 {
3571 unsigned long flags;
3572
3573 spin_lock_irqsave(&job->job_lock, flags);
3574 if (job->ref_cnt) {
3575 spin_unlock_irqrestore(&job->job_lock, flags);
3576 return;
3577 }
3578 spin_unlock_irqrestore(&job->job_lock, flags);
3579
3580 put_device(job->dev); /* release reference for the request */
3581
3582 kfree(job->request_payload.sg_list);
3583 kfree(job->reply_payload.sg_list);
3584 kfree(job);
3585 }
3586
3587 /**
3588 * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3589 * completed
3590 * @job: fc_bsg_job that is complete
3591 */
3592 static void
3593 fc_bsg_jobdone(struct fc_bsg_job *job)
3594 {
3595 struct request *req = job->req;
3596 struct request *rsp = req->next_rq;
3597 int err;
3598
3599 err = job->req->errors = job->reply->result;
3600
3601 if (err < 0)
3602 /* we're only returning the result field in the reply */
3603 job->req->sense_len = sizeof(uint32_t);
3604 else
3605 job->req->sense_len = job->reply_len;
3606
3607 /* we assume all request payload was transferred, residual == 0 */
3608 req->resid_len = 0;
3609
3610 if (rsp) {
3611 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3612
3613 /* set reply (bidi) residual */
3614 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3615 rsp->resid_len);
3616 }
3617 blk_complete_request(req);
3618 }
3619
3620 /**
3621 * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3622 * @rq: BSG request that holds the job to be destroyed
3623 */
3624 static void fc_bsg_softirq_done(struct request *rq)
3625 {
3626 struct fc_bsg_job *job = rq->special;
3627 unsigned long flags;
3628
3629 spin_lock_irqsave(&job->job_lock, flags);
3630 job->state_flags |= FC_RQST_STATE_DONE;
3631 job->ref_cnt--;
3632 spin_unlock_irqrestore(&job->job_lock, flags);
3633
3634 blk_end_request_all(rq, rq->errors);
3635 fc_destroy_bsgjob(job);
3636 }
3637
3638 /**
3639 * fc_bsg_job_timeout - handler for when a bsg request timesout
3640 * @req: request that timed out
3641 */
3642 static enum blk_eh_timer_return
3643 fc_bsg_job_timeout(struct request *req)
3644 {
3645 struct fc_bsg_job *job = (void *) req->special;
3646 struct Scsi_Host *shost = job->shost;
3647 struct fc_internal *i = to_fc_internal(shost->transportt);
3648 unsigned long flags;
3649 int err = 0, done = 0;
3650
3651 if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3652 return BLK_EH_RESET_TIMER;
3653
3654 spin_lock_irqsave(&job->job_lock, flags);
3655 if (job->state_flags & FC_RQST_STATE_DONE)
3656 done = 1;
3657 else
3658 job->ref_cnt++;
3659 spin_unlock_irqrestore(&job->job_lock, flags);
3660
3661 if (!done && i->f->bsg_timeout) {
3662 /* call LLDD to abort the i/o as it has timed out */
3663 err = i->f->bsg_timeout(job);
3664 if (err == -EAGAIN) {
3665 job->ref_cnt--;
3666 return BLK_EH_RESET_TIMER;
3667 } else if (err)
3668 printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3669 "abort failed with status %d\n", err);
3670 }
3671
3672 /* the blk_end_sync_io() doesn't check the error */
3673 if (done)
3674 return BLK_EH_NOT_HANDLED;
3675 else
3676 return BLK_EH_HANDLED;
3677 }
3678
3679 static int
3680 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3681 {
3682 size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3683
3684 BUG_ON(!req->nr_phys_segments);
3685
3686 buf->sg_list = kzalloc(sz, GFP_KERNEL);
3687 if (!buf->sg_list)
3688 return -ENOMEM;
3689 sg_init_table(buf->sg_list, req->nr_phys_segments);
3690 buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3691 buf->payload_len = blk_rq_bytes(req);
3692 return 0;
3693 }
3694
3695
3696 /**
3697 * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3698 * bsg request
3699 * @shost: SCSI Host corresponding to the bsg object
3700 * @rport: (optional) FC Remote Port corresponding to the bsg object
3701 * @req: BSG request that needs a job structure
3702 */
3703 static int
3704 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3705 struct request *req)
3706 {
3707 struct fc_internal *i = to_fc_internal(shost->transportt);
3708 struct request *rsp = req->next_rq;
3709 struct fc_bsg_job *job;
3710 int ret;
3711
3712 BUG_ON(req->special);
3713
3714 job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3715 GFP_KERNEL);
3716 if (!job)
3717 return -ENOMEM;
3718
3719 /*
3720 * Note: this is a bit silly.
3721 * The request gets formatted as a SGIO v4 ioctl request, which
3722 * then gets reformatted as a blk request, which then gets
3723 * reformatted as a fc bsg request. And on completion, we have
3724 * to wrap return results such that SGIO v4 thinks it was a scsi
3725 * status. I hope this was all worth it.
3726 */
3727
3728 req->special = job;
3729 job->shost = shost;
3730 job->rport = rport;
3731 job->req = req;
3732 if (i->f->dd_bsg_size)
3733 job->dd_data = (void *)&job[1];
3734 spin_lock_init(&job->job_lock);
3735 job->request = (struct fc_bsg_request *)req->cmd;
3736 job->request_len = req->cmd_len;
3737 job->reply = req->sense;
3738 job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3739 * allocated */
3740 if (req->bio) {
3741 ret = fc_bsg_map_buffer(&job->request_payload, req);
3742 if (ret)
3743 goto failjob_rls_job;
3744 }
3745 if (rsp && rsp->bio) {
3746 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3747 if (ret)
3748 goto failjob_rls_rqst_payload;
3749 }
3750 job->job_done = fc_bsg_jobdone;
3751 if (rport)
3752 job->dev = &rport->dev;
3753 else
3754 job->dev = &shost->shost_gendev;
3755 get_device(job->dev); /* take a reference for the request */
3756
3757 job->ref_cnt = 1;
3758
3759 return 0;
3760
3761
3762 failjob_rls_rqst_payload:
3763 kfree(job->request_payload.sg_list);
3764 failjob_rls_job:
3765 kfree(job);
3766 return -ENOMEM;
3767 }
3768
3769
3770 enum fc_dispatch_result {
3771 FC_DISPATCH_BREAK, /* on return, q is locked, break from q loop */
3772 FC_DISPATCH_LOCKED, /* on return, q is locked, continue on */
3773 FC_DISPATCH_UNLOCKED, /* on return, q is unlocked, continue on */
3774 };
3775
3776
3777 /**
3778 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3779 * @q: fc host request queue
3780 * @shost: scsi host rport attached to
3781 * @job: bsg job to be processed
3782 */
3783 static enum fc_dispatch_result
3784 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3785 struct fc_bsg_job *job)
3786 {
3787 struct fc_internal *i = to_fc_internal(shost->transportt);
3788 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3789 int ret;
3790
3791 /* Validate the host command */
3792 switch (job->request->msgcode) {
3793 case FC_BSG_HST_ADD_RPORT:
3794 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3795 break;
3796
3797 case FC_BSG_HST_DEL_RPORT:
3798 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3799 break;
3800
3801 case FC_BSG_HST_ELS_NOLOGIN:
3802 cmdlen += sizeof(struct fc_bsg_host_els);
3803 /* there better be a xmt and rcv payloads */
3804 if ((!job->request_payload.payload_len) ||
3805 (!job->reply_payload.payload_len)) {
3806 ret = -EINVAL;
3807 goto fail_host_msg;
3808 }
3809 break;
3810
3811 case FC_BSG_HST_CT:
3812 cmdlen += sizeof(struct fc_bsg_host_ct);
3813 /* there better be xmt and rcv payloads */
3814 if ((!job->request_payload.payload_len) ||
3815 (!job->reply_payload.payload_len)) {
3816 ret = -EINVAL;
3817 goto fail_host_msg;
3818 }
3819 break;
3820
3821 case FC_BSG_HST_VENDOR:
3822 cmdlen += sizeof(struct fc_bsg_host_vendor);
3823 if ((shost->hostt->vendor_id == 0L) ||
3824 (job->request->rqst_data.h_vendor.vendor_id !=
3825 shost->hostt->vendor_id)) {
3826 ret = -ESRCH;
3827 goto fail_host_msg;
3828 }
3829 break;
3830
3831 default:
3832 ret = -EBADR;
3833 goto fail_host_msg;
3834 }
3835
3836 /* check if we really have all the request data needed */
3837 if (job->request_len < cmdlen) {
3838 ret = -ENOMSG;
3839 goto fail_host_msg;
3840 }
3841
3842 ret = i->f->bsg_request(job);
3843 if (!ret)
3844 return FC_DISPATCH_UNLOCKED;
3845
3846 fail_host_msg:
3847 /* return the errno failure code as the only status */
3848 BUG_ON(job->reply_len < sizeof(uint32_t));
3849 job->reply->reply_payload_rcv_len = 0;
3850 job->reply->result = ret;
3851 job->reply_len = sizeof(uint32_t);
3852 fc_bsg_jobdone(job);
3853 return FC_DISPATCH_UNLOCKED;
3854 }
3855
3856
3857 /*
3858 * fc_bsg_goose_queue - restart rport queue in case it was stopped
3859 * @rport: rport to be restarted
3860 */
3861 static void
3862 fc_bsg_goose_queue(struct fc_rport *rport)
3863 {
3864 if (!rport->rqst_q)
3865 return;
3866
3867 /*
3868 * This get/put dance makes no sense
3869 */
3870 get_device(&rport->dev);
3871 blk_run_queue_async(rport->rqst_q);
3872 put_device(&rport->dev);
3873 }
3874
3875 /**
3876 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3877 * @q: rport request queue
3878 * @shost: scsi host rport attached to
3879 * @rport: rport request destined to
3880 * @job: bsg job to be processed
3881 */
3882 static enum fc_dispatch_result
3883 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3884 struct fc_rport *rport, struct fc_bsg_job *job)
3885 {
3886 struct fc_internal *i = to_fc_internal(shost->transportt);
3887 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3888 int ret;
3889
3890 /* Validate the rport command */
3891 switch (job->request->msgcode) {
3892 case FC_BSG_RPT_ELS:
3893 cmdlen += sizeof(struct fc_bsg_rport_els);
3894 goto check_bidi;
3895
3896 case FC_BSG_RPT_CT:
3897 cmdlen += sizeof(struct fc_bsg_rport_ct);
3898 check_bidi:
3899 /* there better be xmt and rcv payloads */
3900 if ((!job->request_payload.payload_len) ||
3901 (!job->reply_payload.payload_len)) {
3902 ret = -EINVAL;
3903 goto fail_rport_msg;
3904 }
3905 break;
3906 default:
3907 ret = -EBADR;
3908 goto fail_rport_msg;
3909 }
3910
3911 /* check if we really have all the request data needed */
3912 if (job->request_len < cmdlen) {
3913 ret = -ENOMSG;
3914 goto fail_rport_msg;
3915 }
3916
3917 ret = i->f->bsg_request(job);
3918 if (!ret)
3919 return FC_DISPATCH_UNLOCKED;
3920
3921 fail_rport_msg:
3922 /* return the errno failure code as the only status */
3923 BUG_ON(job->reply_len < sizeof(uint32_t));
3924 job->reply->reply_payload_rcv_len = 0;
3925 job->reply->result = ret;
3926 job->reply_len = sizeof(uint32_t);
3927 fc_bsg_jobdone(job);
3928 return FC_DISPATCH_UNLOCKED;
3929 }
3930
3931
3932 /**
3933 * fc_bsg_request_handler - generic handler for bsg requests
3934 * @q: request queue to manage
3935 * @shost: Scsi_Host related to the bsg object
3936 * @rport: FC remote port related to the bsg object (optional)
3937 * @dev: device structure for bsg object
3938 */
3939 static void
3940 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3941 struct fc_rport *rport, struct device *dev)
3942 {
3943 struct request *req;
3944 struct fc_bsg_job *job;
3945 enum fc_dispatch_result ret;
3946
3947 if (!get_device(dev))
3948 return;
3949
3950 while (1) {
3951 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
3952 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3953 break;
3954
3955 req = blk_fetch_request(q);
3956 if (!req)
3957 break;
3958
3959 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3960 req->errors = -ENXIO;
3961 spin_unlock_irq(q->queue_lock);
3962 blk_end_request_all(req, -ENXIO);
3963 spin_lock_irq(q->queue_lock);
3964 continue;
3965 }
3966
3967 spin_unlock_irq(q->queue_lock);
3968
3969 ret = fc_req_to_bsgjob(shost, rport, req);
3970 if (ret) {
3971 req->errors = ret;
3972 blk_end_request_all(req, ret);
3973 spin_lock_irq(q->queue_lock);
3974 continue;
3975 }
3976
3977 job = req->special;
3978
3979 /* check if we have the msgcode value at least */
3980 if (job->request_len < sizeof(uint32_t)) {
3981 BUG_ON(job->reply_len < sizeof(uint32_t));
3982 job->reply->reply_payload_rcv_len = 0;
3983 job->reply->result = -ENOMSG;
3984 job->reply_len = sizeof(uint32_t);
3985 fc_bsg_jobdone(job);
3986 spin_lock_irq(q->queue_lock);
3987 continue;
3988 }
3989
3990 /* the dispatch routines will unlock the queue_lock */
3991 if (rport)
3992 ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3993 else
3994 ret = fc_bsg_host_dispatch(q, shost, job);
3995
3996 /* did dispatcher hit state that can't process any more */
3997 if (ret == FC_DISPATCH_BREAK)
3998 break;
3999
4000 /* did dispatcher had released the lock */
4001 if (ret == FC_DISPATCH_UNLOCKED)
4002 spin_lock_irq(q->queue_lock);
4003 }
4004
4005 spin_unlock_irq(q->queue_lock);
4006 put_device(dev);
4007 spin_lock_irq(q->queue_lock);
4008 }
4009
4010
4011 /**
4012 * fc_bsg_host_handler - handler for bsg requests for a fc host
4013 * @q: fc host request queue
4014 */
4015 static void
4016 fc_bsg_host_handler(struct request_queue *q)
4017 {
4018 struct Scsi_Host *shost = q->queuedata;
4019
4020 fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
4021 }
4022
4023
4024 /**
4025 * fc_bsg_rport_handler - handler for bsg requests for a fc rport
4026 * @q: rport request queue
4027 */
4028 static void
4029 fc_bsg_rport_handler(struct request_queue *q)
4030 {
4031 struct fc_rport *rport = q->queuedata;
4032 struct Scsi_Host *shost = rport_to_shost(rport);
4033
4034 fc_bsg_request_handler(q, shost, rport, &rport->dev);
4035 }
4036
4037
4038 /**
4039 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
4040 * @shost: shost for fc_host
4041 * @fc_host: fc_host adding the structures to
4042 */
4043 static int
4044 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
4045 {
4046 struct device *dev = &shost->shost_gendev;
4047 struct fc_internal *i = to_fc_internal(shost->transportt);
4048 struct request_queue *q;
4049 int err;
4050 char bsg_name[20];
4051
4052 fc_host->rqst_q = NULL;
4053
4054 if (!i->f->bsg_request)
4055 return -ENOTSUPP;
4056
4057 snprintf(bsg_name, sizeof(bsg_name),
4058 "fc_host%d", shost->host_no);
4059
4060 q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
4061 if (!q) {
4062 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4063 "initialize - no request queue\n",
4064 shost->host_no);
4065 return -ENOMEM;
4066 }
4067
4068 q->queuedata = shost;
4069 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4070 blk_queue_softirq_done(q, fc_bsg_softirq_done);
4071 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4072 blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4073
4074 err = bsg_register_queue(q, dev, bsg_name, NULL);
4075 if (err) {
4076 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4077 "initialize - register queue\n",
4078 shost->host_no);
4079 blk_cleanup_queue(q);
4080 return err;
4081 }
4082
4083 fc_host->rqst_q = q;
4084 return 0;
4085 }
4086
4087
4088 /**
4089 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4090 * @shost: shost that rport is attached to
4091 * @rport: rport that the bsg hooks are being attached to
4092 */
4093 static int
4094 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4095 {
4096 struct device *dev = &rport->dev;
4097 struct fc_internal *i = to_fc_internal(shost->transportt);
4098 struct request_queue *q;
4099 int err;
4100
4101 rport->rqst_q = NULL;
4102
4103 if (!i->f->bsg_request)
4104 return -ENOTSUPP;
4105
4106 q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
4107 if (!q) {
4108 printk(KERN_ERR "%s: bsg interface failed to "
4109 "initialize - no request queue\n",
4110 dev->kobj.name);
4111 return -ENOMEM;
4112 }
4113
4114 q->queuedata = rport;
4115 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4116 blk_queue_softirq_done(q, fc_bsg_softirq_done);
4117 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4118 blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4119
4120 err = bsg_register_queue(q, dev, NULL, NULL);
4121 if (err) {
4122 printk(KERN_ERR "%s: bsg interface failed to "
4123 "initialize - register queue\n",
4124 dev->kobj.name);
4125 blk_cleanup_queue(q);
4126 return err;
4127 }
4128
4129 rport->rqst_q = q;
4130 return 0;
4131 }
4132
4133
4134 /**
4135 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4136 * @q: the request_queue that is to be torn down.
4137 *
4138 * Notes:
4139 * Before unregistering the queue empty any requests that are blocked
4140 *
4141 *
4142 */
4143 static void
4144 fc_bsg_remove(struct request_queue *q)
4145 {
4146 if (q) {
4147 bsg_unregister_queue(q);
4148 blk_cleanup_queue(q);
4149 }
4150 }
4151
4152
4153 /* Original Author: Martin Hicks */
4154 MODULE_AUTHOR("James Smart");
4155 MODULE_DESCRIPTION("FC Transport Attributes");
4156 MODULE_LICENSE("GPL");
4157
4158 module_init(fc_transport_init);
4159 module_exit(fc_transport_exit);
Linux kernel - Deliverables
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