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Merge branch 'for-linus' of git://git.infradead.org/users/sameo/mfd-2.6
[linux-btrfs-devel.git] / drivers / scsi / scsi_transport_fc.c
blob1b214910b71414804f6d0c6dee0932ead1f98156
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 <linux/netlink.h>
39 #include <net/netlink.h>
40 #include <scsi/scsi_netlink_fc.h>
41 #include <scsi/scsi_bsg_fc.h>
42 #include "scsi_priv.h"
43 #include "scsi_transport_fc_internal.h"
44
45 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
46 static void fc_vport_sched_delete(struct work_struct *work);
47 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
48 struct device *pdev, struct fc_vport_identifiers *ids,
49 struct fc_vport **vport);
50 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
51 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
52 static void fc_bsg_remove(struct request_queue *);
53 static void fc_bsg_goose_queue(struct fc_rport *);
54
55 /*
56 * Module Parameters
57 */
58
59 /*
60 * dev_loss_tmo: the default number of seconds that the FC transport
61 * should insulate the loss of a remote port.
62 * The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
63 */
64 static unsigned int fc_dev_loss_tmo = 60; /* seconds */
65
66 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
67 MODULE_PARM_DESC(dev_loss_tmo,
68 "Maximum number of seconds that the FC transport should"
69 " insulate the loss of a remote port. Once this value is"
70 " exceeded, the scsi target is removed. Value should be"
71 " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
72 " fast_io_fail_tmo is not set.");
73
74 /*
75 * Redefine so that we can have same named attributes in the
76 * sdev/starget/host objects.
77 */
78 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
79 struct device_attribute device_attr_##_prefix##_##_name = \
80 __ATTR(_name,_mode,_show,_store)
81
82 #define fc_enum_name_search(title, table_type, table) \
83 static const char *get_fc_##title##_name(enum table_type table_key) \
84 { \
85 int i; \
86 char *name = NULL; \
87 \
88 for (i = 0; i < ARRAY_SIZE(table); i++) { \
89 if (table[i].value == table_key) { \
90 name = table[i].name; \
91 break; \
92 } \
93 } \
94 return name; \
95 }
96
97 #define fc_enum_name_match(title, table_type, table) \
98 static int get_fc_##title##_match(const char *table_key, \
99 enum table_type *value) \
100 { \
101 int i; \
102 \
103 for (i = 0; i < ARRAY_SIZE(table); i++) { \
104 if (strncmp(table_key, table[i].name, \
105 table[i].matchlen) == 0) { \
106 *value = table[i].value; \
107 return 0; /* success */ \
108 } \
109 } \
110 return 1; /* failure */ \
111 }
112
113
114 /* Convert fc_port_type values to ascii string name */
115 static struct {
116 enum fc_port_type value;
117 char *name;
118 } fc_port_type_names[] = {
119 { FC_PORTTYPE_UNKNOWN, "Unknown" },
120 { FC_PORTTYPE_OTHER, "Other" },
121 { FC_PORTTYPE_NOTPRESENT, "Not Present" },
122 { FC_PORTTYPE_NPORT, "NPort (fabric via point-to-point)" },
123 { FC_PORTTYPE_NLPORT, "NLPort (fabric via loop)" },
124 { FC_PORTTYPE_LPORT, "LPort (private loop)" },
125 { FC_PORTTYPE_PTP, "Point-To-Point (direct nport connection)" },
126 { FC_PORTTYPE_NPIV, "NPIV VPORT" },
127 };
128 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
129 #define FC_PORTTYPE_MAX_NAMELEN 50
130
131 /* Reuse fc_port_type enum function for vport_type */
132 #define get_fc_vport_type_name get_fc_port_type_name
133
134
135 /* Convert fc_host_event_code values to ascii string name */
136 static const struct {
137 enum fc_host_event_code value;
138 char *name;
139 } fc_host_event_code_names[] = {
140 { FCH_EVT_LIP, "lip" },
141 { FCH_EVT_LINKUP, "link_up" },
142 { FCH_EVT_LINKDOWN, "link_down" },
143 { FCH_EVT_LIPRESET, "lip_reset" },
144 { FCH_EVT_RSCN, "rscn" },
145 { FCH_EVT_ADAPTER_CHANGE, "adapter_chg" },
146 { FCH_EVT_PORT_UNKNOWN, "port_unknown" },
147 { FCH_EVT_PORT_ONLINE, "port_online" },
148 { FCH_EVT_PORT_OFFLINE, "port_offline" },
149 { FCH_EVT_PORT_FABRIC, "port_fabric" },
150 { FCH_EVT_LINK_UNKNOWN, "link_unknown" },
151 { FCH_EVT_VENDOR_UNIQUE, "vendor_unique" },
152 };
153 fc_enum_name_search(host_event_code, fc_host_event_code,
154 fc_host_event_code_names)
155 #define FC_HOST_EVENT_CODE_MAX_NAMELEN 30
156
157
158 /* Convert fc_port_state values to ascii string name */
159 static struct {
160 enum fc_port_state value;
161 char *name;
162 } fc_port_state_names[] = {
163 { FC_PORTSTATE_UNKNOWN, "Unknown" },
164 { FC_PORTSTATE_NOTPRESENT, "Not Present" },
165 { FC_PORTSTATE_ONLINE, "Online" },
166 { FC_PORTSTATE_OFFLINE, "Offline" },
167 { FC_PORTSTATE_BLOCKED, "Blocked" },
168 { FC_PORTSTATE_BYPASSED, "Bypassed" },
169 { FC_PORTSTATE_DIAGNOSTICS, "Diagnostics" },
170 { FC_PORTSTATE_LINKDOWN, "Linkdown" },
171 { FC_PORTSTATE_ERROR, "Error" },
172 { FC_PORTSTATE_LOOPBACK, "Loopback" },
173 { FC_PORTSTATE_DELETED, "Deleted" },
174 };
175 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
176 #define FC_PORTSTATE_MAX_NAMELEN 20
177
178
179 /* Convert fc_vport_state values to ascii string name */
180 static struct {
181 enum fc_vport_state value;
182 char *name;
183 } fc_vport_state_names[] = {
184 { FC_VPORT_UNKNOWN, "Unknown" },
185 { FC_VPORT_ACTIVE, "Active" },
186 { FC_VPORT_DISABLED, "Disabled" },
187 { FC_VPORT_LINKDOWN, "Linkdown" },
188 { FC_VPORT_INITIALIZING, "Initializing" },
189 { FC_VPORT_NO_FABRIC_SUPP, "No Fabric Support" },
190 { FC_VPORT_NO_FABRIC_RSCS, "No Fabric Resources" },
191 { FC_VPORT_FABRIC_LOGOUT, "Fabric Logout" },
192 { FC_VPORT_FABRIC_REJ_WWN, "Fabric Rejected WWN" },
193 { FC_VPORT_FAILED, "VPort Failed" },
194 };
195 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
196 #define FC_VPORTSTATE_MAX_NAMELEN 24
197
198 /* Reuse fc_vport_state enum function for vport_last_state */
199 #define get_fc_vport_last_state_name get_fc_vport_state_name
200
201
202 /* Convert fc_tgtid_binding_type values to ascii string name */
203 static const struct {
204 enum fc_tgtid_binding_type value;
205 char *name;
206 int matchlen;
207 } fc_tgtid_binding_type_names[] = {
208 { FC_TGTID_BIND_NONE, "none", 4 },
209 { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
210 { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
211 { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
212 };
213 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
214 fc_tgtid_binding_type_names)
215 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
216 fc_tgtid_binding_type_names)
217 #define FC_BINDTYPE_MAX_NAMELEN 30
218
219
220 #define fc_bitfield_name_search(title, table) \
221 static ssize_t \
222 get_fc_##title##_names(u32 table_key, char *buf) \
223 { \
224 char *prefix = ""; \
225 ssize_t len = 0; \
226 int i; \
227 \
228 for (i = 0; i < ARRAY_SIZE(table); i++) { \
229 if (table[i].value & table_key) { \
230 len += sprintf(buf + len, "%s%s", \
231 prefix, table[i].name); \
232 prefix = ", "; \
233 } \
234 } \
235 len += sprintf(buf + len, "\n"); \
236 return len; \
237 }
238
239
240 /* Convert FC_COS bit values to ascii string name */
241 static const struct {
242 u32 value;
243 char *name;
244 } fc_cos_names[] = {
245 { FC_COS_CLASS1, "Class 1" },
246 { FC_COS_CLASS2, "Class 2" },
247 { FC_COS_CLASS3, "Class 3" },
248 { FC_COS_CLASS4, "Class 4" },
249 { FC_COS_CLASS6, "Class 6" },
250 };
251 fc_bitfield_name_search(cos, fc_cos_names)
252
253
254 /* Convert FC_PORTSPEED bit values to ascii string name */
255 static const struct {
256 u32 value;
257 char *name;
258 } fc_port_speed_names[] = {
259 { FC_PORTSPEED_1GBIT, "1 Gbit" },
260 { FC_PORTSPEED_2GBIT, "2 Gbit" },
261 { FC_PORTSPEED_4GBIT, "4 Gbit" },
262 { FC_PORTSPEED_10GBIT, "10 Gbit" },
263 { FC_PORTSPEED_8GBIT, "8 Gbit" },
264 { FC_PORTSPEED_16GBIT, "16 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 22
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
403 fc_host->port_id = -1;
404 fc_host->port_type = FC_PORTTYPE_UNKNOWN;
405 fc_host->port_state = FC_PORTSTATE_UNKNOWN;
406 memset(fc_host->active_fc4s, 0,
407 sizeof(fc_host->active_fc4s));
408 fc_host->speed = FC_PORTSPEED_UNKNOWN;
409 fc_host->fabric_name = -1;
410 memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
411 memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
412
413 fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
414
415 INIT_LIST_HEAD(&fc_host->rports);
416 INIT_LIST_HEAD(&fc_host->rport_bindings);
417 INIT_LIST_HEAD(&fc_host->vports);
418 fc_host->next_rport_number = 0;
419 fc_host->next_target_id = 0;
420 fc_host->next_vport_number = 0;
421 fc_host->npiv_vports_inuse = 0;
422
423 snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
424 "fc_wq_%d", shost->host_no);
425 fc_host->work_q = alloc_workqueue(fc_host->work_q_name, 0, 0);
426 if (!fc_host->work_q)
427 return -ENOMEM;
428
429 fc_host->dev_loss_tmo = fc_dev_loss_tmo;
430 snprintf(fc_host->devloss_work_q_name,
431 sizeof(fc_host->devloss_work_q_name),
432 "fc_dl_%d", shost->host_no);
433 fc_host->devloss_work_q =
434 alloc_workqueue(fc_host->devloss_work_q_name, 0, 0);
435 if (!fc_host->devloss_work_q) {
436 destroy_workqueue(fc_host->work_q);
437 fc_host->work_q = NULL;
438 return -ENOMEM;
439 }
440
441 fc_bsg_hostadd(shost, fc_host);
442 /* ignore any bsg add error - we just can't do sgio */
443
444 return 0;
445 }
446
447 static int fc_host_remove(struct transport_container *tc, struct device *dev,
448 struct device *cdev)
449 {
450 struct Scsi_Host *shost = dev_to_shost(dev);
451 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
452
453 fc_bsg_remove(fc_host->rqst_q);
454 return 0;
455 }
456
457 static DECLARE_TRANSPORT_CLASS(fc_host_class,
458 "fc_host",
459 fc_host_setup,
460 fc_host_remove,
461 NULL);
462
463 /*
464 * Setup and Remove actions for remote ports are handled
465 * in the service functions below.
466 */
467 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
468 "fc_remote_ports",
469 NULL,
470 NULL,
471 NULL);
472
473 /*
474 * Setup and Remove actions for virtual ports are handled
475 * in the service functions below.
476 */
477 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
478 "fc_vports",
479 NULL,
480 NULL,
481 NULL);
482
483 /*
484 * Netlink Infrastructure
485 */
486
487 static atomic_t fc_event_seq;
488
489 /**
490 * fc_get_event_number - Obtain the next sequential FC event number
491 *
492 * Notes:
493 * We could have inlined this, but it would have required fc_event_seq to
494 * be exposed. For now, live with the subroutine call.
495 * Atomic used to avoid lock/unlock...
496 */
497 u32
498 fc_get_event_number(void)
499 {
500 return atomic_add_return(1, &fc_event_seq);
501 }
502 EXPORT_SYMBOL(fc_get_event_number);
503
504
505 /**
506 * fc_host_post_event - called to post an even on an fc_host.
507 * @shost: host the event occurred on
508 * @event_number: fc event number obtained from get_fc_event_number()
509 * @event_code: fc_host event being posted
510 * @event_data: 32bits of data for the event being posted
511 *
512 * Notes:
513 * This routine assumes no locks are held on entry.
514 */
515 void
516 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
517 enum fc_host_event_code event_code, u32 event_data)
518 {
519 struct sk_buff *skb;
520 struct nlmsghdr *nlh;
521 struct fc_nl_event *event;
522 const char *name;
523 u32 len, skblen;
524 int err;
525
526 if (!scsi_nl_sock) {
527 err = -ENOENT;
528 goto send_fail;
529 }
530
531 len = FC_NL_MSGALIGN(sizeof(*event));
532 skblen = NLMSG_SPACE(len);
533
534 skb = alloc_skb(skblen, GFP_KERNEL);
535 if (!skb) {
536 err = -ENOBUFS;
537 goto send_fail;
538 }
539
540 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
541 skblen - sizeof(*nlh), 0);
542 if (!nlh) {
543 err = -ENOBUFS;
544 goto send_fail_skb;
545 }
546 event = NLMSG_DATA(nlh);
547
548 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
549 FC_NL_ASYNC_EVENT, len);
550 event->seconds = get_seconds();
551 event->vendor_id = 0;
552 event->host_no = shost->host_no;
553 event->event_datalen = sizeof(u32); /* bytes */
554 event->event_num = event_number;
555 event->event_code = event_code;
556 event->event_data = event_data;
557
558 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
559 GFP_KERNEL);
560 return;
561
562 send_fail_skb:
563 kfree_skb(skb);
564 send_fail:
565 name = get_fc_host_event_code_name(event_code);
566 printk(KERN_WARNING
567 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
568 __func__, shost->host_no,
569 (name) ? name : "<unknown>", event_data, err);
570 return;
571 }
572 EXPORT_SYMBOL(fc_host_post_event);
573
574
575 /**
576 * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
577 * @shost: host the event occurred on
578 * @event_number: fc event number obtained from get_fc_event_number()
579 * @data_len: amount, in bytes, of vendor unique data
580 * @data_buf: pointer to vendor unique data
581 * @vendor_id: Vendor id
582 *
583 * Notes:
584 * This routine assumes no locks are held on entry.
585 */
586 void
587 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
588 u32 data_len, char * data_buf, u64 vendor_id)
589 {
590 struct sk_buff *skb;
591 struct nlmsghdr *nlh;
592 struct fc_nl_event *event;
593 u32 len, skblen;
594 int err;
595
596 if (!scsi_nl_sock) {
597 err = -ENOENT;
598 goto send_vendor_fail;
599 }
600
601 len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
602 skblen = NLMSG_SPACE(len);
603
604 skb = alloc_skb(skblen, GFP_KERNEL);
605 if (!skb) {
606 err = -ENOBUFS;
607 goto send_vendor_fail;
608 }
609
610 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
611 skblen - sizeof(*nlh), 0);
612 if (!nlh) {
613 err = -ENOBUFS;
614 goto send_vendor_fail_skb;
615 }
616 event = NLMSG_DATA(nlh);
617
618 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
619 FC_NL_ASYNC_EVENT, len);
620 event->seconds = get_seconds();
621 event->vendor_id = vendor_id;
622 event->host_no = shost->host_no;
623 event->event_datalen = data_len; /* bytes */
624 event->event_num = event_number;
625 event->event_code = FCH_EVT_VENDOR_UNIQUE;
626 memcpy(&event->event_data, data_buf, data_len);
627
628 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
629 GFP_KERNEL);
630 return;
631
632 send_vendor_fail_skb:
633 kfree_skb(skb);
634 send_vendor_fail:
635 printk(KERN_WARNING
636 "%s: Dropped Event : host %d vendor_unique - err %d\n",
637 __func__, shost->host_no, err);
638 return;
639 }
640 EXPORT_SYMBOL(fc_host_post_vendor_event);
641
642
643
644 static __init int fc_transport_init(void)
645 {
646 int error;
647
648 atomic_set(&fc_event_seq, 0);
649
650 error = transport_class_register(&fc_host_class);
651 if (error)
652 return error;
653 error = transport_class_register(&fc_vport_class);
654 if (error)
655 goto unreg_host_class;
656 error = transport_class_register(&fc_rport_class);
657 if (error)
658 goto unreg_vport_class;
659 error = transport_class_register(&fc_transport_class);
660 if (error)
661 goto unreg_rport_class;
662 return 0;
663
664 unreg_rport_class:
665 transport_class_unregister(&fc_rport_class);
666 unreg_vport_class:
667 transport_class_unregister(&fc_vport_class);
668 unreg_host_class:
669 transport_class_unregister(&fc_host_class);
670 return error;
671 }
672
673 static void __exit fc_transport_exit(void)
674 {
675 transport_class_unregister(&fc_transport_class);
676 transport_class_unregister(&fc_rport_class);
677 transport_class_unregister(&fc_host_class);
678 transport_class_unregister(&fc_vport_class);
679 }
680
681 /*
682 * FC Remote Port Attribute Management
683 */
684
685 #define fc_rport_show_function(field, format_string, sz, cast) \
686 static ssize_t \
687 show_fc_rport_##field (struct device *dev, \
688 struct device_attribute *attr, char *buf) \
689 { \
690 struct fc_rport *rport = transport_class_to_rport(dev); \
691 struct Scsi_Host *shost = rport_to_shost(rport); \
692 struct fc_internal *i = to_fc_internal(shost->transportt); \
693 if ((i->f->get_rport_##field) && \
694 !((rport->port_state == FC_PORTSTATE_BLOCKED) || \
695 (rport->port_state == FC_PORTSTATE_DELETED) || \
696 (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
697 i->f->get_rport_##field(rport); \
698 return snprintf(buf, sz, format_string, cast rport->field); \
699 }
700
701 #define fc_rport_store_function(field) \
702 static ssize_t \
703 store_fc_rport_##field(struct device *dev, \
704 struct device_attribute *attr, \
705 const char *buf, size_t count) \
706 { \
707 int val; \
708 struct fc_rport *rport = transport_class_to_rport(dev); \
709 struct Scsi_Host *shost = rport_to_shost(rport); \
710 struct fc_internal *i = to_fc_internal(shost->transportt); \
711 char *cp; \
712 if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
713 (rport->port_state == FC_PORTSTATE_DELETED) || \
714 (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
715 return -EBUSY; \
716 val = simple_strtoul(buf, &cp, 0); \
717 if (*cp && (*cp != '\n')) \
718 return -EINVAL; \
719 i->f->set_rport_##field(rport, val); \
720 return count; \
721 }
722
723 #define fc_rport_rd_attr(field, format_string, sz) \
724 fc_rport_show_function(field, format_string, sz, ) \
725 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
726 show_fc_rport_##field, NULL)
727
728 #define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
729 fc_rport_show_function(field, format_string, sz, (cast)) \
730 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
731 show_fc_rport_##field, NULL)
732
733 #define fc_rport_rw_attr(field, format_string, sz) \
734 fc_rport_show_function(field, format_string, sz, ) \
735 fc_rport_store_function(field) \
736 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
737 show_fc_rport_##field, \
738 store_fc_rport_##field)
739
740
741 #define fc_private_rport_show_function(field, format_string, sz, cast) \
742 static ssize_t \
743 show_fc_rport_##field (struct device *dev, \
744 struct device_attribute *attr, char *buf) \
745 { \
746 struct fc_rport *rport = transport_class_to_rport(dev); \
747 return snprintf(buf, sz, format_string, cast rport->field); \
748 }
749
750 #define fc_private_rport_rd_attr(field, format_string, sz) \
751 fc_private_rport_show_function(field, format_string, sz, ) \
752 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
753 show_fc_rport_##field, NULL)
754
755 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
756 fc_private_rport_show_function(field, format_string, sz, (cast)) \
757 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
758 show_fc_rport_##field, NULL)
759
760
761 #define fc_private_rport_rd_enum_attr(title, maxlen) \
762 static ssize_t \
763 show_fc_rport_##title (struct device *dev, \
764 struct device_attribute *attr, char *buf) \
765 { \
766 struct fc_rport *rport = transport_class_to_rport(dev); \
767 const char *name; \
768 name = get_fc_##title##_name(rport->title); \
769 if (!name) \
770 return -EINVAL; \
771 return snprintf(buf, maxlen, "%s\n", name); \
772 } \
773 static FC_DEVICE_ATTR(rport, title, S_IRUGO, \
774 show_fc_rport_##title, NULL)
775
776
777 #define SETUP_RPORT_ATTRIBUTE_RD(field) \
778 i->private_rport_attrs[count] = device_attr_rport_##field; \
779 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
780 i->private_rport_attrs[count].store = NULL; \
781 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
782 if (i->f->show_rport_##field) \
783 count++
784
785 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
786 i->private_rport_attrs[count] = device_attr_rport_##field; \
787 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
788 i->private_rport_attrs[count].store = NULL; \
789 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
790 count++
791
792 #define SETUP_RPORT_ATTRIBUTE_RW(field) \
793 i->private_rport_attrs[count] = device_attr_rport_##field; \
794 if (!i->f->set_rport_##field) { \
795 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
796 i->private_rport_attrs[count].store = NULL; \
797 } \
798 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
799 if (i->f->show_rport_##field) \
800 count++
801
802 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
803 { \
804 i->private_rport_attrs[count] = device_attr_rport_##field; \
805 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
806 count++; \
807 }
808
809
810 /* The FC Transport Remote Port Attributes: */
811
812 /* Fixed Remote Port Attributes */
813
814 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
815
816 static ssize_t
817 show_fc_rport_supported_classes (struct device *dev,
818 struct device_attribute *attr, char *buf)
819 {
820 struct fc_rport *rport = transport_class_to_rport(dev);
821 if (rport->supported_classes == FC_COS_UNSPECIFIED)
822 return snprintf(buf, 20, "unspecified\n");
823 return get_fc_cos_names(rport->supported_classes, buf);
824 }
825 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
826 show_fc_rport_supported_classes, NULL);
827
828 /* Dynamic Remote Port Attributes */
829
830 /*
831 * dev_loss_tmo attribute
832 */
833 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
834 {
835 char *cp;
836
837 *val = simple_strtoul(buf, &cp, 0);
838 if ((*cp && (*cp != '\n')) || (*val < 0))
839 return -EINVAL;
840 /*
841 * Check for overflow; dev_loss_tmo is u32
842 */
843 if (*val > UINT_MAX)
844 return -EINVAL;
845
846 return 0;
847 }
848
849 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
850 unsigned long val)
851 {
852 struct Scsi_Host *shost = rport_to_shost(rport);
853 struct fc_internal *i = to_fc_internal(shost->transportt);
854
855 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
856 (rport->port_state == FC_PORTSTATE_DELETED) ||
857 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
858 return -EBUSY;
859 /*
860 * Check for overflow; dev_loss_tmo is u32
861 */
862 if (val > UINT_MAX)
863 return -EINVAL;
864
865 /*
866 * If fast_io_fail is off we have to cap
867 * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
868 */
869 if (rport->fast_io_fail_tmo == -1 &&
870 val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
871 return -EINVAL;
872
873 i->f->set_rport_dev_loss_tmo(rport, val);
874 return 0;
875 }
876
877 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
878 static ssize_t
879 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
880 const char *buf, size_t count)
881 {
882 struct fc_rport *rport = transport_class_to_rport(dev);
883 unsigned long val;
884 int rc;
885
886 rc = fc_str_to_dev_loss(buf, &val);
887 if (rc)
888 return rc;
889
890 rc = fc_rport_set_dev_loss_tmo(rport, val);
891 if (rc)
892 return rc;
893 return count;
894 }
895 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
896 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
897
898
899 /* Private Remote Port Attributes */
900
901 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
902 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
903 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
904
905 static ssize_t
906 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
907 char *buf)
908 {
909 struct fc_rport *rport = transport_class_to_rport(dev);
910
911 /* identify any roles that are port_id specific */
912 if ((rport->port_id != -1) &&
913 (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
914 FC_WELLKNOWN_PORTID_MASK) {
915 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
916 case FC_FPORT_PORTID:
917 return snprintf(buf, 30, "Fabric Port\n");
918 case FC_FABCTLR_PORTID:
919 return snprintf(buf, 30, "Fabric Controller\n");
920 case FC_DIRSRVR_PORTID:
921 return snprintf(buf, 30, "Directory Server\n");
922 case FC_TIMESRVR_PORTID:
923 return snprintf(buf, 30, "Time Server\n");
924 case FC_MGMTSRVR_PORTID:
925 return snprintf(buf, 30, "Management Server\n");
926 default:
927 return snprintf(buf, 30, "Unknown Fabric Entity\n");
928 }
929 } else {
930 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
931 return snprintf(buf, 20, "unknown\n");
932 return get_fc_port_roles_names(rport->roles, buf);
933 }
934 }
935 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
936 show_fc_rport_roles, NULL);
937
938 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
939 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
940
941 /*
942 * fast_io_fail_tmo attribute
943 */
944 static ssize_t
945 show_fc_rport_fast_io_fail_tmo (struct device *dev,
946 struct device_attribute *attr, char *buf)
947 {
948 struct fc_rport *rport = transport_class_to_rport(dev);
949
950 if (rport->fast_io_fail_tmo == -1)
951 return snprintf(buf, 5, "off\n");
952 return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
953 }
954
955 static ssize_t
956 store_fc_rport_fast_io_fail_tmo(struct device *dev,
957 struct device_attribute *attr, const char *buf,
958 size_t count)
959 {
960 int val;
961 char *cp;
962 struct fc_rport *rport = transport_class_to_rport(dev);
963
964 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
965 (rport->port_state == FC_PORTSTATE_DELETED) ||
966 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
967 return -EBUSY;
968 if (strncmp(buf, "off", 3) == 0)
969 rport->fast_io_fail_tmo = -1;
970 else {
971 val = simple_strtoul(buf, &cp, 0);
972 if ((*cp && (*cp != '\n')) || (val < 0))
973 return -EINVAL;
974 /*
975 * Cap fast_io_fail by dev_loss_tmo or
976 * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
977 */
978 if ((val >= rport->dev_loss_tmo) ||
979 (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
980 return -EINVAL;
981
982 rport->fast_io_fail_tmo = val;
983 }
984 return count;
985 }
986 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
987 show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
988
989
990 /*
991 * FC SCSI Target Attribute Management
992 */
993
994 /*
995 * Note: in the target show function we recognize when the remote
996 * port is in the hierarchy and do not allow the driver to get
997 * involved in sysfs functions. The driver only gets involved if
998 * it's the "old" style that doesn't use rports.
999 */
1000 #define fc_starget_show_function(field, format_string, sz, cast) \
1001 static ssize_t \
1002 show_fc_starget_##field (struct device *dev, \
1003 struct device_attribute *attr, char *buf) \
1004 { \
1005 struct scsi_target *starget = transport_class_to_starget(dev); \
1006 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
1007 struct fc_internal *i = to_fc_internal(shost->transportt); \
1008 struct fc_rport *rport = starget_to_rport(starget); \
1009 if (rport) \
1010 fc_starget_##field(starget) = rport->field; \
1011 else if (i->f->get_starget_##field) \
1012 i->f->get_starget_##field(starget); \
1013 return snprintf(buf, sz, format_string, \
1014 cast fc_starget_##field(starget)); \
1015 }
1016
1017 #define fc_starget_rd_attr(field, format_string, sz) \
1018 fc_starget_show_function(field, format_string, sz, ) \
1019 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1020 show_fc_starget_##field, NULL)
1021
1022 #define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
1023 fc_starget_show_function(field, format_string, sz, (cast)) \
1024 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1025 show_fc_starget_##field, NULL)
1026
1027 #define SETUP_STARGET_ATTRIBUTE_RD(field) \
1028 i->private_starget_attrs[count] = device_attr_starget_##field; \
1029 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1030 i->private_starget_attrs[count].store = NULL; \
1031 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1032 if (i->f->show_starget_##field) \
1033 count++
1034
1035 #define SETUP_STARGET_ATTRIBUTE_RW(field) \
1036 i->private_starget_attrs[count] = device_attr_starget_##field; \
1037 if (!i->f->set_starget_##field) { \
1038 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1039 i->private_starget_attrs[count].store = NULL; \
1040 } \
1041 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1042 if (i->f->show_starget_##field) \
1043 count++
1044
1045 /* The FC Transport SCSI Target Attributes: */
1046 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1047 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1048 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1049
1050
1051 /*
1052 * FC Virtual Port Attribute Management
1053 */
1054
1055 #define fc_vport_show_function(field, format_string, sz, cast) \
1056 static ssize_t \
1057 show_fc_vport_##field (struct device *dev, \
1058 struct device_attribute *attr, char *buf) \
1059 { \
1060 struct fc_vport *vport = transport_class_to_vport(dev); \
1061 struct Scsi_Host *shost = vport_to_shost(vport); \
1062 struct fc_internal *i = to_fc_internal(shost->transportt); \
1063 if ((i->f->get_vport_##field) && \
1064 !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))) \
1065 i->f->get_vport_##field(vport); \
1066 return snprintf(buf, sz, format_string, cast vport->field); \
1067 }
1068
1069 #define fc_vport_store_function(field) \
1070 static ssize_t \
1071 store_fc_vport_##field(struct device *dev, \
1072 struct device_attribute *attr, \
1073 const char *buf, size_t count) \
1074 { \
1075 int val; \
1076 struct fc_vport *vport = transport_class_to_vport(dev); \
1077 struct Scsi_Host *shost = vport_to_shost(vport); \
1078 struct fc_internal *i = to_fc_internal(shost->transportt); \
1079 char *cp; \
1080 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1081 return -EBUSY; \
1082 val = simple_strtoul(buf, &cp, 0); \
1083 if (*cp && (*cp != '\n')) \
1084 return -EINVAL; \
1085 i->f->set_vport_##field(vport, val); \
1086 return count; \
1087 }
1088
1089 #define fc_vport_store_str_function(field, slen) \
1090 static ssize_t \
1091 store_fc_vport_##field(struct device *dev, \
1092 struct device_attribute *attr, \
1093 const char *buf, size_t count) \
1094 { \
1095 struct fc_vport *vport = transport_class_to_vport(dev); \
1096 struct Scsi_Host *shost = vport_to_shost(vport); \
1097 struct fc_internal *i = to_fc_internal(shost->transportt); \
1098 unsigned int cnt=count; \
1099 \
1100 /* count may include a LF at end of string */ \
1101 if (buf[cnt-1] == '\n') \
1102 cnt--; \
1103 if (cnt > ((slen) - 1)) \
1104 return -EINVAL; \
1105 memcpy(vport->field, buf, cnt); \
1106 i->f->set_vport_##field(vport); \
1107 return count; \
1108 }
1109
1110 #define fc_vport_rd_attr(field, format_string, sz) \
1111 fc_vport_show_function(field, format_string, sz, ) \
1112 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1113 show_fc_vport_##field, NULL)
1114
1115 #define fc_vport_rd_attr_cast(field, format_string, sz, cast) \
1116 fc_vport_show_function(field, format_string, sz, (cast)) \
1117 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1118 show_fc_vport_##field, NULL)
1119
1120 #define fc_vport_rw_attr(field, format_string, sz) \
1121 fc_vport_show_function(field, format_string, sz, ) \
1122 fc_vport_store_function(field) \
1123 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1124 show_fc_vport_##field, \
1125 store_fc_vport_##field)
1126
1127 #define fc_private_vport_show_function(field, format_string, sz, cast) \
1128 static ssize_t \
1129 show_fc_vport_##field (struct device *dev, \
1130 struct device_attribute *attr, char *buf) \
1131 { \
1132 struct fc_vport *vport = transport_class_to_vport(dev); \
1133 return snprintf(buf, sz, format_string, cast vport->field); \
1134 }
1135
1136 #define fc_private_vport_store_u32_function(field) \
1137 static ssize_t \
1138 store_fc_vport_##field(struct device *dev, \
1139 struct device_attribute *attr, \
1140 const char *buf, size_t count) \
1141 { \
1142 u32 val; \
1143 struct fc_vport *vport = transport_class_to_vport(dev); \
1144 char *cp; \
1145 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1146 return -EBUSY; \
1147 val = simple_strtoul(buf, &cp, 0); \
1148 if (*cp && (*cp != '\n')) \
1149 return -EINVAL; \
1150 vport->field = val; \
1151 return count; \
1152 }
1153
1154
1155 #define fc_private_vport_rd_attr(field, format_string, sz) \
1156 fc_private_vport_show_function(field, format_string, sz, ) \
1157 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1158 show_fc_vport_##field, NULL)
1159
1160 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast) \
1161 fc_private_vport_show_function(field, format_string, sz, (cast)) \
1162 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1163 show_fc_vport_##field, NULL)
1164
1165 #define fc_private_vport_rw_u32_attr(field, format_string, sz) \
1166 fc_private_vport_show_function(field, format_string, sz, ) \
1167 fc_private_vport_store_u32_function(field) \
1168 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1169 show_fc_vport_##field, \
1170 store_fc_vport_##field)
1171
1172
1173 #define fc_private_vport_rd_enum_attr(title, maxlen) \
1174 static ssize_t \
1175 show_fc_vport_##title (struct device *dev, \
1176 struct device_attribute *attr, \
1177 char *buf) \
1178 { \
1179 struct fc_vport *vport = transport_class_to_vport(dev); \
1180 const char *name; \
1181 name = get_fc_##title##_name(vport->title); \
1182 if (!name) \
1183 return -EINVAL; \
1184 return snprintf(buf, maxlen, "%s\n", name); \
1185 } \
1186 static FC_DEVICE_ATTR(vport, title, S_IRUGO, \
1187 show_fc_vport_##title, NULL)
1188
1189
1190 #define SETUP_VPORT_ATTRIBUTE_RD(field) \
1191 i->private_vport_attrs[count] = device_attr_vport_##field; \
1192 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1193 i->private_vport_attrs[count].store = NULL; \
1194 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1195 if (i->f->get_##field) \
1196 count++
1197 /* NOTE: Above MACRO differs: checks function not show bit */
1198
1199 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field) \
1200 i->private_vport_attrs[count] = device_attr_vport_##field; \
1201 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1202 i->private_vport_attrs[count].store = NULL; \
1203 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1204 count++
1205
1206 #define SETUP_VPORT_ATTRIBUTE_WR(field) \
1207 i->private_vport_attrs[count] = device_attr_vport_##field; \
1208 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1209 if (i->f->field) \
1210 count++
1211 /* NOTE: Above MACRO differs: checks function */
1212
1213 #define SETUP_VPORT_ATTRIBUTE_RW(field) \
1214 i->private_vport_attrs[count] = device_attr_vport_##field; \
1215 if (!i->f->set_vport_##field) { \
1216 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1217 i->private_vport_attrs[count].store = NULL; \
1218 } \
1219 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1220 count++
1221 /* NOTE: Above MACRO differs: does not check show bit */
1222
1223 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field) \
1224 { \
1225 i->private_vport_attrs[count] = device_attr_vport_##field; \
1226 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1227 count++; \
1228 }
1229
1230
1231 /* The FC Transport Virtual Port Attributes: */
1232
1233 /* Fixed Virtual Port Attributes */
1234
1235 /* Dynamic Virtual Port Attributes */
1236
1237 /* Private Virtual Port Attributes */
1238
1239 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1240 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1241 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1242 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1243
1244 static ssize_t
1245 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1246 char *buf)
1247 {
1248 struct fc_vport *vport = transport_class_to_vport(dev);
1249
1250 if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1251 return snprintf(buf, 20, "unknown\n");
1252 return get_fc_port_roles_names(vport->roles, buf);
1253 }
1254 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1255
1256 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1257
1258 fc_private_vport_show_function(symbolic_name, "%s\n",
1259 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1260 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1261 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1262 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1263
1264 static ssize_t
1265 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1266 const char *buf, size_t count)
1267 {
1268 struct fc_vport *vport = transport_class_to_vport(dev);
1269 struct Scsi_Host *shost = vport_to_shost(vport);
1270 unsigned long flags;
1271
1272 spin_lock_irqsave(shost->host_lock, flags);
1273 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1274 spin_unlock_irqrestore(shost->host_lock, flags);
1275 return -EBUSY;
1276 }
1277 vport->flags |= FC_VPORT_DELETING;
1278 spin_unlock_irqrestore(shost->host_lock, flags);
1279
1280 fc_queue_work(shost, &vport->vport_delete_work);
1281 return count;
1282 }
1283 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1284 NULL, store_fc_vport_delete);
1285
1286
1287 /*
1288 * Enable/Disable vport
1289 * Write "1" to disable, write "0" to enable
1290 */
1291 static ssize_t
1292 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1293 const char *buf,
1294 size_t count)
1295 {
1296 struct fc_vport *vport = transport_class_to_vport(dev);
1297 struct Scsi_Host *shost = vport_to_shost(vport);
1298 struct fc_internal *i = to_fc_internal(shost->transportt);
1299 int stat;
1300
1301 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1302 return -EBUSY;
1303
1304 if (*buf == '0') {
1305 if (vport->vport_state != FC_VPORT_DISABLED)
1306 return -EALREADY;
1307 } else if (*buf == '1') {
1308 if (vport->vport_state == FC_VPORT_DISABLED)
1309 return -EALREADY;
1310 } else
1311 return -EINVAL;
1312
1313 stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1314 return stat ? stat : count;
1315 }
1316 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1317 NULL, store_fc_vport_disable);
1318
1319
1320 /*
1321 * Host Attribute Management
1322 */
1323
1324 #define fc_host_show_function(field, format_string, sz, cast) \
1325 static ssize_t \
1326 show_fc_host_##field (struct device *dev, \
1327 struct device_attribute *attr, char *buf) \
1328 { \
1329 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1330 struct fc_internal *i = to_fc_internal(shost->transportt); \
1331 if (i->f->get_host_##field) \
1332 i->f->get_host_##field(shost); \
1333 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1334 }
1335
1336 #define fc_host_store_function(field) \
1337 static ssize_t \
1338 store_fc_host_##field(struct device *dev, \
1339 struct device_attribute *attr, \
1340 const char *buf, size_t count) \
1341 { \
1342 int val; \
1343 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1344 struct fc_internal *i = to_fc_internal(shost->transportt); \
1345 char *cp; \
1346 \
1347 val = simple_strtoul(buf, &cp, 0); \
1348 if (*cp && (*cp != '\n')) \
1349 return -EINVAL; \
1350 i->f->set_host_##field(shost, val); \
1351 return count; \
1352 }
1353
1354 #define fc_host_store_str_function(field, slen) \
1355 static ssize_t \
1356 store_fc_host_##field(struct device *dev, \
1357 struct device_attribute *attr, \
1358 const char *buf, size_t count) \
1359 { \
1360 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1361 struct fc_internal *i = to_fc_internal(shost->transportt); \
1362 unsigned int cnt=count; \
1363 \
1364 /* count may include a LF at end of string */ \
1365 if (buf[cnt-1] == '\n') \
1366 cnt--; \
1367 if (cnt > ((slen) - 1)) \
1368 return -EINVAL; \
1369 memcpy(fc_host_##field(shost), buf, cnt); \
1370 i->f->set_host_##field(shost); \
1371 return count; \
1372 }
1373
1374 #define fc_host_rd_attr(field, format_string, sz) \
1375 fc_host_show_function(field, format_string, sz, ) \
1376 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1377 show_fc_host_##field, NULL)
1378
1379 #define fc_host_rd_attr_cast(field, format_string, sz, cast) \
1380 fc_host_show_function(field, format_string, sz, (cast)) \
1381 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1382 show_fc_host_##field, NULL)
1383
1384 #define fc_host_rw_attr(field, format_string, sz) \
1385 fc_host_show_function(field, format_string, sz, ) \
1386 fc_host_store_function(field) \
1387 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
1388 show_fc_host_##field, \
1389 store_fc_host_##field)
1390
1391 #define fc_host_rd_enum_attr(title, maxlen) \
1392 static ssize_t \
1393 show_fc_host_##title (struct device *dev, \
1394 struct device_attribute *attr, char *buf) \
1395 { \
1396 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1397 struct fc_internal *i = to_fc_internal(shost->transportt); \
1398 const char *name; \
1399 if (i->f->get_host_##title) \
1400 i->f->get_host_##title(shost); \
1401 name = get_fc_##title##_name(fc_host_##title(shost)); \
1402 if (!name) \
1403 return -EINVAL; \
1404 return snprintf(buf, maxlen, "%s\n", name); \
1405 } \
1406 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1407
1408 #define SETUP_HOST_ATTRIBUTE_RD(field) \
1409 i->private_host_attrs[count] = device_attr_host_##field; \
1410 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1411 i->private_host_attrs[count].store = NULL; \
1412 i->host_attrs[count] = &i->private_host_attrs[count]; \
1413 if (i->f->show_host_##field) \
1414 count++
1415
1416 #define SETUP_HOST_ATTRIBUTE_RD_NS(field) \
1417 i->private_host_attrs[count] = device_attr_host_##field; \
1418 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1419 i->private_host_attrs[count].store = NULL; \
1420 i->host_attrs[count] = &i->private_host_attrs[count]; \
1421 count++
1422
1423 #define SETUP_HOST_ATTRIBUTE_RW(field) \
1424 i->private_host_attrs[count] = device_attr_host_##field; \
1425 if (!i->f->set_host_##field) { \
1426 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1427 i->private_host_attrs[count].store = NULL; \
1428 } \
1429 i->host_attrs[count] = &i->private_host_attrs[count]; \
1430 if (i->f->show_host_##field) \
1431 count++
1432
1433
1434 #define fc_private_host_show_function(field, format_string, sz, cast) \
1435 static ssize_t \
1436 show_fc_host_##field (struct device *dev, \
1437 struct device_attribute *attr, char *buf) \
1438 { \
1439 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1440 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1441 }
1442
1443 #define fc_private_host_rd_attr(field, format_string, sz) \
1444 fc_private_host_show_function(field, format_string, sz, ) \
1445 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1446 show_fc_host_##field, NULL)
1447
1448 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
1449 fc_private_host_show_function(field, format_string, sz, (cast)) \
1450 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1451 show_fc_host_##field, NULL)
1452
1453 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
1454 i->private_host_attrs[count] = device_attr_host_##field; \
1455 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1456 i->private_host_attrs[count].store = NULL; \
1457 i->host_attrs[count] = &i->private_host_attrs[count]; \
1458 count++
1459
1460 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
1461 { \
1462 i->private_host_attrs[count] = device_attr_host_##field; \
1463 i->host_attrs[count] = &i->private_host_attrs[count]; \
1464 count++; \
1465 }
1466
1467
1468 /* Fixed Host Attributes */
1469
1470 static ssize_t
1471 show_fc_host_supported_classes (struct device *dev,
1472 struct device_attribute *attr, char *buf)
1473 {
1474 struct Scsi_Host *shost = transport_class_to_shost(dev);
1475
1476 if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1477 return snprintf(buf, 20, "unspecified\n");
1478
1479 return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1480 }
1481 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1482 show_fc_host_supported_classes, NULL);
1483
1484 static ssize_t
1485 show_fc_host_supported_fc4s (struct device *dev,
1486 struct device_attribute *attr, char *buf)
1487 {
1488 struct Scsi_Host *shost = transport_class_to_shost(dev);
1489 return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1490 }
1491 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1492 show_fc_host_supported_fc4s, NULL);
1493
1494 static ssize_t
1495 show_fc_host_supported_speeds (struct device *dev,
1496 struct device_attribute *attr, char *buf)
1497 {
1498 struct Scsi_Host *shost = transport_class_to_shost(dev);
1499
1500 if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1501 return snprintf(buf, 20, "unknown\n");
1502
1503 return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1504 }
1505 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1506 show_fc_host_supported_speeds, NULL);
1507
1508
1509 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1510 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1511 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1512 unsigned long long);
1513 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1514 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1515 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1516
1517
1518 /* Dynamic Host Attributes */
1519
1520 static ssize_t
1521 show_fc_host_active_fc4s (struct device *dev,
1522 struct device_attribute *attr, char *buf)
1523 {
1524 struct Scsi_Host *shost = transport_class_to_shost(dev);
1525 struct fc_internal *i = to_fc_internal(shost->transportt);
1526
1527 if (i->f->get_host_active_fc4s)
1528 i->f->get_host_active_fc4s(shost);
1529
1530 return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1531 }
1532 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1533 show_fc_host_active_fc4s, NULL);
1534
1535 static ssize_t
1536 show_fc_host_speed (struct device *dev,
1537 struct device_attribute *attr, char *buf)
1538 {
1539 struct Scsi_Host *shost = transport_class_to_shost(dev);
1540 struct fc_internal *i = to_fc_internal(shost->transportt);
1541
1542 if (i->f->get_host_speed)
1543 i->f->get_host_speed(shost);
1544
1545 if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1546 return snprintf(buf, 20, "unknown\n");
1547
1548 return get_fc_port_speed_names(fc_host_speed(shost), buf);
1549 }
1550 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1551 show_fc_host_speed, NULL);
1552
1553
1554 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1555 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1556 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1557 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1558 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1559
1560 fc_private_host_show_function(system_hostname, "%s\n",
1561 FC_SYMBOLIC_NAME_SIZE + 1, )
1562 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1563 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1564 show_fc_host_system_hostname, store_fc_host_system_hostname);
1565
1566
1567 /* Private Host Attributes */
1568
1569 static ssize_t
1570 show_fc_private_host_tgtid_bind_type(struct device *dev,
1571 struct device_attribute *attr, char *buf)
1572 {
1573 struct Scsi_Host *shost = transport_class_to_shost(dev);
1574 const char *name;
1575
1576 name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1577 if (!name)
1578 return -EINVAL;
1579 return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1580 }
1581
1582 #define get_list_head_entry(pos, head, member) \
1583 pos = list_entry((head)->next, typeof(*pos), member)
1584
1585 static ssize_t
1586 store_fc_private_host_tgtid_bind_type(struct device *dev,
1587 struct device_attribute *attr, const char *buf, size_t count)
1588 {
1589 struct Scsi_Host *shost = transport_class_to_shost(dev);
1590 struct fc_rport *rport;
1591 enum fc_tgtid_binding_type val;
1592 unsigned long flags;
1593
1594 if (get_fc_tgtid_bind_type_match(buf, &val))
1595 return -EINVAL;
1596
1597 /* if changing bind type, purge all unused consistent bindings */
1598 if (val != fc_host_tgtid_bind_type(shost)) {
1599 spin_lock_irqsave(shost->host_lock, flags);
1600 while (!list_empty(&fc_host_rport_bindings(shost))) {
1601 get_list_head_entry(rport,
1602 &fc_host_rport_bindings(shost), peers);
1603 list_del(&rport->peers);
1604 rport->port_state = FC_PORTSTATE_DELETED;
1605 fc_queue_work(shost, &rport->rport_delete_work);
1606 }
1607 spin_unlock_irqrestore(shost->host_lock, flags);
1608 }
1609
1610 fc_host_tgtid_bind_type(shost) = val;
1611 return count;
1612 }
1613
1614 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1615 show_fc_private_host_tgtid_bind_type,
1616 store_fc_private_host_tgtid_bind_type);
1617
1618 static ssize_t
1619 store_fc_private_host_issue_lip(struct device *dev,
1620 struct device_attribute *attr, const char *buf, size_t count)
1621 {
1622 struct Scsi_Host *shost = transport_class_to_shost(dev);
1623 struct fc_internal *i = to_fc_internal(shost->transportt);
1624 int ret;
1625
1626 /* ignore any data value written to the attribute */
1627 if (i->f->issue_fc_host_lip) {
1628 ret = i->f->issue_fc_host_lip(shost);
1629 return ret ? ret: count;
1630 }
1631
1632 return -ENOENT;
1633 }
1634
1635 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1636 store_fc_private_host_issue_lip);
1637
1638 static ssize_t
1639 store_fc_private_host_dev_loss_tmo(struct device *dev,
1640 struct device_attribute *attr,
1641 const char *buf, size_t count)
1642 {
1643 struct Scsi_Host *shost = transport_class_to_shost(dev);
1644 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1645 struct fc_rport *rport;
1646 unsigned long val, flags;
1647 int rc;
1648
1649 rc = fc_str_to_dev_loss(buf, &val);
1650 if (rc)
1651 return rc;
1652
1653 fc_host_dev_loss_tmo(shost) = val;
1654 spin_lock_irqsave(shost->host_lock, flags);
1655 list_for_each_entry(rport, &fc_host->rports, peers)
1656 fc_rport_set_dev_loss_tmo(rport, val);
1657 spin_unlock_irqrestore(shost->host_lock, flags);
1658 return count;
1659 }
1660
1661 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
1662 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
1663 show_fc_host_dev_loss_tmo,
1664 store_fc_private_host_dev_loss_tmo);
1665
1666 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1667
1668 /*
1669 * Host Statistics Management
1670 */
1671
1672 /* Show a given an attribute in the statistics group */
1673 static ssize_t
1674 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1675 {
1676 struct Scsi_Host *shost = transport_class_to_shost(dev);
1677 struct fc_internal *i = to_fc_internal(shost->transportt);
1678 struct fc_host_statistics *stats;
1679 ssize_t ret = -ENOENT;
1680
1681 if (offset > sizeof(struct fc_host_statistics) ||
1682 offset % sizeof(u64) != 0)
1683 WARN_ON(1);
1684
1685 if (i->f->get_fc_host_stats) {
1686 stats = (i->f->get_fc_host_stats)(shost);
1687 if (stats)
1688 ret = snprintf(buf, 20, "0x%llx\n",
1689 (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1690 }
1691 return ret;
1692 }
1693
1694
1695 /* generate a read-only statistics attribute */
1696 #define fc_host_statistic(name) \
1697 static ssize_t show_fcstat_##name(struct device *cd, \
1698 struct device_attribute *attr, \
1699 char *buf) \
1700 { \
1701 return fc_stat_show(cd, buf, \
1702 offsetof(struct fc_host_statistics, name)); \
1703 } \
1704 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1705
1706 fc_host_statistic(seconds_since_last_reset);
1707 fc_host_statistic(tx_frames);
1708 fc_host_statistic(tx_words);
1709 fc_host_statistic(rx_frames);
1710 fc_host_statistic(rx_words);
1711 fc_host_statistic(lip_count);
1712 fc_host_statistic(nos_count);
1713 fc_host_statistic(error_frames);
1714 fc_host_statistic(dumped_frames);
1715 fc_host_statistic(link_failure_count);
1716 fc_host_statistic(loss_of_sync_count);
1717 fc_host_statistic(loss_of_signal_count);
1718 fc_host_statistic(prim_seq_protocol_err_count);
1719 fc_host_statistic(invalid_tx_word_count);
1720 fc_host_statistic(invalid_crc_count);
1721 fc_host_statistic(fcp_input_requests);
1722 fc_host_statistic(fcp_output_requests);
1723 fc_host_statistic(fcp_control_requests);
1724 fc_host_statistic(fcp_input_megabytes);
1725 fc_host_statistic(fcp_output_megabytes);
1726
1727 static ssize_t
1728 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1729 const char *buf, size_t count)
1730 {
1731 struct Scsi_Host *shost = transport_class_to_shost(dev);
1732 struct fc_internal *i = to_fc_internal(shost->transportt);
1733
1734 /* ignore any data value written to the attribute */
1735 if (i->f->reset_fc_host_stats) {
1736 i->f->reset_fc_host_stats(shost);
1737 return count;
1738 }
1739
1740 return -ENOENT;
1741 }
1742 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1743 fc_reset_statistics);
1744
1745 static struct attribute *fc_statistics_attrs[] = {
1746 &device_attr_host_seconds_since_last_reset.attr,
1747 &device_attr_host_tx_frames.attr,
1748 &device_attr_host_tx_words.attr,
1749 &device_attr_host_rx_frames.attr,
1750 &device_attr_host_rx_words.attr,
1751 &device_attr_host_lip_count.attr,
1752 &device_attr_host_nos_count.attr,
1753 &device_attr_host_error_frames.attr,
1754 &device_attr_host_dumped_frames.attr,
1755 &device_attr_host_link_failure_count.attr,
1756 &device_attr_host_loss_of_sync_count.attr,
1757 &device_attr_host_loss_of_signal_count.attr,
1758 &device_attr_host_prim_seq_protocol_err_count.attr,
1759 &device_attr_host_invalid_tx_word_count.attr,
1760 &device_attr_host_invalid_crc_count.attr,
1761 &device_attr_host_fcp_input_requests.attr,
1762 &device_attr_host_fcp_output_requests.attr,
1763 &device_attr_host_fcp_control_requests.attr,
1764 &device_attr_host_fcp_input_megabytes.attr,
1765 &device_attr_host_fcp_output_megabytes.attr,
1766 &device_attr_host_reset_statistics.attr,
1767 NULL
1768 };
1769
1770 static struct attribute_group fc_statistics_group = {
1771 .name = "statistics",
1772 .attrs = fc_statistics_attrs,
1773 };
1774
1775
1776 /* Host Vport Attributes */
1777
1778 static int
1779 fc_parse_wwn(const char *ns, u64 *nm)
1780 {
1781 unsigned int i, j;
1782 u8 wwn[8];
1783
1784 memset(wwn, 0, sizeof(wwn));
1785
1786 /* Validate and store the new name */
1787 for (i=0, j=0; i < 16; i++) {
1788 int value;
1789
1790 value = hex_to_bin(*ns++);
1791 if (value >= 0)
1792 j = (j << 4) | value;
1793 else
1794 return -EINVAL;
1795 if (i % 2) {
1796 wwn[i/2] = j & 0xff;
1797 j = 0;
1798 }
1799 }
1800
1801 *nm = wwn_to_u64(wwn);
1802
1803 return 0;
1804 }
1805
1806
1807 /*
1808 * "Short-cut" sysfs variable to create a new vport on a FC Host.
1809 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1810 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1811 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1812 */
1813 static ssize_t
1814 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1815 const char *buf, size_t count)
1816 {
1817 struct Scsi_Host *shost = transport_class_to_shost(dev);
1818 struct fc_vport_identifiers vid;
1819 struct fc_vport *vport;
1820 unsigned int cnt=count;
1821 int stat;
1822
1823 memset(&vid, 0, sizeof(vid));
1824
1825 /* count may include a LF at end of string */
1826 if (buf[cnt-1] == '\n')
1827 cnt--;
1828
1829 /* validate we have enough characters for WWPN */
1830 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1831 return -EINVAL;
1832
1833 stat = fc_parse_wwn(&buf[0], &vid.port_name);
1834 if (stat)
1835 return stat;
1836
1837 stat = fc_parse_wwn(&buf[17], &vid.node_name);
1838 if (stat)
1839 return stat;
1840
1841 vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1842 vid.vport_type = FC_PORTTYPE_NPIV;
1843 /* vid.symbolic_name is already zero/NULL's */
1844 vid.disable = false; /* always enabled */
1845
1846 /* we only allow support on Channel 0 !!! */
1847 stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1848 return stat ? stat : count;
1849 }
1850 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1851 store_fc_host_vport_create);
1852
1853
1854 /*
1855 * "Short-cut" sysfs variable to delete a vport on a FC Host.
1856 * Vport is identified by a string containing "<WWPN>:<WWNN>".
1857 * The WWNs are specified as hex characters, and may *not* contain
1858 * any prefixes (e.g. 0x, x, etc)
1859 */
1860 static ssize_t
1861 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1862 const char *buf, size_t count)
1863 {
1864 struct Scsi_Host *shost = transport_class_to_shost(dev);
1865 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1866 struct fc_vport *vport;
1867 u64 wwpn, wwnn;
1868 unsigned long flags;
1869 unsigned int cnt=count;
1870 int stat, match;
1871
1872 /* count may include a LF at end of string */
1873 if (buf[cnt-1] == '\n')
1874 cnt--;
1875
1876 /* validate we have enough characters for WWPN */
1877 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1878 return -EINVAL;
1879
1880 stat = fc_parse_wwn(&buf[0], &wwpn);
1881 if (stat)
1882 return stat;
1883
1884 stat = fc_parse_wwn(&buf[17], &wwnn);
1885 if (stat)
1886 return stat;
1887
1888 spin_lock_irqsave(shost->host_lock, flags);
1889 match = 0;
1890 /* we only allow support on Channel 0 !!! */
1891 list_for_each_entry(vport, &fc_host->vports, peers) {
1892 if ((vport->channel == 0) &&
1893 (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1894 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1895 break;
1896 vport->flags |= FC_VPORT_DELETING;
1897 match = 1;
1898 break;
1899 }
1900 }
1901 spin_unlock_irqrestore(shost->host_lock, flags);
1902
1903 if (!match)
1904 return -ENODEV;
1905
1906 stat = fc_vport_terminate(vport);
1907 return stat ? stat : count;
1908 }
1909 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1910 store_fc_host_vport_delete);
1911
1912
1913 static int fc_host_match(struct attribute_container *cont,
1914 struct device *dev)
1915 {
1916 struct Scsi_Host *shost;
1917 struct fc_internal *i;
1918
1919 if (!scsi_is_host_device(dev))
1920 return 0;
1921
1922 shost = dev_to_shost(dev);
1923 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1924 != &fc_host_class.class)
1925 return 0;
1926
1927 i = to_fc_internal(shost->transportt);
1928
1929 return &i->t.host_attrs.ac == cont;
1930 }
1931
1932 static int fc_target_match(struct attribute_container *cont,
1933 struct device *dev)
1934 {
1935 struct Scsi_Host *shost;
1936 struct fc_internal *i;
1937
1938 if (!scsi_is_target_device(dev))
1939 return 0;
1940
1941 shost = dev_to_shost(dev->parent);
1942 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1943 != &fc_host_class.class)
1944 return 0;
1945
1946 i = to_fc_internal(shost->transportt);
1947
1948 return &i->t.target_attrs.ac == cont;
1949 }
1950
1951 static void fc_rport_dev_release(struct device *dev)
1952 {
1953 struct fc_rport *rport = dev_to_rport(dev);
1954 put_device(dev->parent);
1955 kfree(rport);
1956 }
1957
1958 int scsi_is_fc_rport(const struct device *dev)
1959 {
1960 return dev->release == fc_rport_dev_release;
1961 }
1962 EXPORT_SYMBOL(scsi_is_fc_rport);
1963
1964 static int fc_rport_match(struct attribute_container *cont,
1965 struct device *dev)
1966 {
1967 struct Scsi_Host *shost;
1968 struct fc_internal *i;
1969
1970 if (!scsi_is_fc_rport(dev))
1971 return 0;
1972
1973 shost = dev_to_shost(dev->parent);
1974 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1975 != &fc_host_class.class)
1976 return 0;
1977
1978 i = to_fc_internal(shost->transportt);
1979
1980 return &i->rport_attr_cont.ac == cont;
1981 }
1982
1983
1984 static void fc_vport_dev_release(struct device *dev)
1985 {
1986 struct fc_vport *vport = dev_to_vport(dev);
1987 put_device(dev->parent); /* release kobj parent */
1988 kfree(vport);
1989 }
1990
1991 int scsi_is_fc_vport(const struct device *dev)
1992 {
1993 return dev->release == fc_vport_dev_release;
1994 }
1995 EXPORT_SYMBOL(scsi_is_fc_vport);
1996
1997 static int fc_vport_match(struct attribute_container *cont,
1998 struct device *dev)
1999 {
2000 struct fc_vport *vport;
2001 struct Scsi_Host *shost;
2002 struct fc_internal *i;
2003
2004 if (!scsi_is_fc_vport(dev))
2005 return 0;
2006 vport = dev_to_vport(dev);
2007
2008 shost = vport_to_shost(vport);
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 return &i->vport_attr_cont.ac == cont;
2015 }
2016
2017
2018 /**
2019 * fc_timed_out - FC Transport I/O timeout intercept handler
2020 * @scmd: The SCSI command which timed out
2021 *
2022 * This routine protects against error handlers getting invoked while a
2023 * rport is in a blocked state, typically due to a temporarily loss of
2024 * connectivity. If the error handlers are allowed to proceed, requests
2025 * to abort i/o, reset the target, etc will likely fail as there is no way
2026 * to communicate with the device to perform the requested function. These
2027 * failures may result in the midlayer taking the device offline, requiring
2028 * manual intervention to restore operation.
2029 *
2030 * This routine, called whenever an i/o times out, validates the state of
2031 * the underlying rport. If the rport is blocked, it returns
2032 * EH_RESET_TIMER, which will continue to reschedule the timeout.
2033 * Eventually, either the device will return, or devloss_tmo will fire,
2034 * and when the timeout then fires, it will be handled normally.
2035 * If the rport is not blocked, normal error handling continues.
2036 *
2037 * Notes:
2038 * This routine assumes no locks are held on entry.
2039 */
2040 static enum blk_eh_timer_return
2041 fc_timed_out(struct scsi_cmnd *scmd)
2042 {
2043 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2044
2045 if (rport->port_state == FC_PORTSTATE_BLOCKED)
2046 return BLK_EH_RESET_TIMER;
2047
2048 return BLK_EH_NOT_HANDLED;
2049 }
2050
2051 /*
2052 * Called by fc_user_scan to locate an rport on the shost that
2053 * matches the channel and target id, and invoke scsi_scan_target()
2054 * on the rport.
2055 */
2056 static void
2057 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2058 {
2059 struct fc_rport *rport;
2060 unsigned long flags;
2061
2062 spin_lock_irqsave(shost->host_lock, flags);
2063
2064 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2065 if (rport->scsi_target_id == -1)
2066 continue;
2067
2068 if (rport->port_state != FC_PORTSTATE_ONLINE)
2069 continue;
2070
2071 if ((channel == rport->channel) &&
2072 (id == rport->scsi_target_id)) {
2073 spin_unlock_irqrestore(shost->host_lock, flags);
2074 scsi_scan_target(&rport->dev, channel, id, lun, 1);
2075 return;
2076 }
2077 }
2078
2079 spin_unlock_irqrestore(shost->host_lock, flags);
2080 }
2081
2082 /*
2083 * Called via sysfs scan routines. Necessary, as the FC transport
2084 * wants to place all target objects below the rport object. So this
2085 * routine must invoke the scsi_scan_target() routine with the rport
2086 * object as the parent.
2087 */
2088 static int
2089 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2090 {
2091 uint chlo, chhi;
2092 uint tgtlo, tgthi;
2093
2094 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2095 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2096 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2097 return -EINVAL;
2098
2099 if (channel == SCAN_WILD_CARD) {
2100 chlo = 0;
2101 chhi = shost->max_channel + 1;
2102 } else {
2103 chlo = channel;
2104 chhi = channel + 1;
2105 }
2106
2107 if (id == SCAN_WILD_CARD) {
2108 tgtlo = 0;
2109 tgthi = shost->max_id;
2110 } else {
2111 tgtlo = id;
2112 tgthi = id + 1;
2113 }
2114
2115 for ( ; chlo < chhi; chlo++)
2116 for ( ; tgtlo < tgthi; tgtlo++)
2117 fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2118
2119 return 0;
2120 }
2121
2122 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2123 int result)
2124 {
2125 struct fc_internal *i = to_fc_internal(shost->transportt);
2126 return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2127 }
2128
2129 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2130 {
2131 struct fc_internal *i = to_fc_internal(shost->transportt);
2132 return i->f->it_nexus_response(shost, nexus, result);
2133 }
2134
2135 struct scsi_transport_template *
2136 fc_attach_transport(struct fc_function_template *ft)
2137 {
2138 int count;
2139 struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2140 GFP_KERNEL);
2141
2142 if (unlikely(!i))
2143 return NULL;
2144
2145 i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2146 i->t.target_attrs.ac.class = &fc_transport_class.class;
2147 i->t.target_attrs.ac.match = fc_target_match;
2148 i->t.target_size = sizeof(struct fc_starget_attrs);
2149 transport_container_register(&i->t.target_attrs);
2150
2151 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2152 i->t.host_attrs.ac.class = &fc_host_class.class;
2153 i->t.host_attrs.ac.match = fc_host_match;
2154 i->t.host_size = sizeof(struct fc_host_attrs);
2155 if (ft->get_fc_host_stats)
2156 i->t.host_attrs.statistics = &fc_statistics_group;
2157 transport_container_register(&i->t.host_attrs);
2158
2159 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2160 i->rport_attr_cont.ac.class = &fc_rport_class.class;
2161 i->rport_attr_cont.ac.match = fc_rport_match;
2162 transport_container_register(&i->rport_attr_cont);
2163
2164 i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2165 i->vport_attr_cont.ac.class = &fc_vport_class.class;
2166 i->vport_attr_cont.ac.match = fc_vport_match;
2167 transport_container_register(&i->vport_attr_cont);
2168
2169 i->f = ft;
2170
2171 /* Transport uses the shost workq for scsi scanning */
2172 i->t.create_work_queue = 1;
2173
2174 i->t.eh_timed_out = fc_timed_out;
2175
2176 i->t.user_scan = fc_user_scan;
2177
2178 /* target-mode drivers' functions */
2179 i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2180 i->t.it_nexus_response = fc_it_nexus_response;
2181
2182 /*
2183 * Setup SCSI Target Attributes.
2184 */
2185 count = 0;
2186 SETUP_STARGET_ATTRIBUTE_RD(node_name);
2187 SETUP_STARGET_ATTRIBUTE_RD(port_name);
2188 SETUP_STARGET_ATTRIBUTE_RD(port_id);
2189
2190 BUG_ON(count > FC_STARGET_NUM_ATTRS);
2191
2192 i->starget_attrs[count] = NULL;
2193
2194
2195 /*
2196 * Setup SCSI Host Attributes.
2197 */
2198 count=0;
2199 SETUP_HOST_ATTRIBUTE_RD(node_name);
2200 SETUP_HOST_ATTRIBUTE_RD(port_name);
2201 SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2202 SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2203 SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2204 SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2205 SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2206 if (ft->vport_create) {
2207 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2208 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2209 }
2210 SETUP_HOST_ATTRIBUTE_RD(serial_number);
2211
2212 SETUP_HOST_ATTRIBUTE_RD(port_id);
2213 SETUP_HOST_ATTRIBUTE_RD(port_type);
2214 SETUP_HOST_ATTRIBUTE_RD(port_state);
2215 SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2216 SETUP_HOST_ATTRIBUTE_RD(speed);
2217 SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2218 SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2219 SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2220
2221 /* Transport-managed attributes */
2222 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2223 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2224 if (ft->issue_fc_host_lip)
2225 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2226 if (ft->vport_create)
2227 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2228 if (ft->vport_delete)
2229 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2230
2231 BUG_ON(count > FC_HOST_NUM_ATTRS);
2232
2233 i->host_attrs[count] = NULL;
2234
2235 /*
2236 * Setup Remote Port Attributes.
2237 */
2238 count=0;
2239 SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2240 SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2241 SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2242 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2243 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2244 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2245 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2246 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2247 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2248 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2249
2250 BUG_ON(count > FC_RPORT_NUM_ATTRS);
2251
2252 i->rport_attrs[count] = NULL;
2253
2254 /*
2255 * Setup Virtual Port Attributes.
2256 */
2257 count=0;
2258 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2259 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2260 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2261 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2262 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2263 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2264 SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2265 SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2266 SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2267
2268 BUG_ON(count > FC_VPORT_NUM_ATTRS);
2269
2270 i->vport_attrs[count] = NULL;
2271
2272 return &i->t;
2273 }
2274 EXPORT_SYMBOL(fc_attach_transport);
2275
2276 void fc_release_transport(struct scsi_transport_template *t)
2277 {
2278 struct fc_internal *i = to_fc_internal(t);
2279
2280 transport_container_unregister(&i->t.target_attrs);
2281 transport_container_unregister(&i->t.host_attrs);
2282 transport_container_unregister(&i->rport_attr_cont);
2283 transport_container_unregister(&i->vport_attr_cont);
2284
2285 kfree(i);
2286 }
2287 EXPORT_SYMBOL(fc_release_transport);
2288
2289 /**
2290 * fc_queue_work - Queue work to the fc_host workqueue.
2291 * @shost: Pointer to Scsi_Host bound to fc_host.
2292 * @work: Work to queue for execution.
2293 *
2294 * Return value:
2295 * 1 - work queued for execution
2296 * 0 - work is already queued
2297 * -EINVAL - work queue doesn't exist
2298 */
2299 static int
2300 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2301 {
2302 if (unlikely(!fc_host_work_q(shost))) {
2303 printk(KERN_ERR
2304 "ERROR: FC host '%s' attempted to queue work, "
2305 "when no workqueue created.\n", shost->hostt->name);
2306 dump_stack();
2307
2308 return -EINVAL;
2309 }
2310
2311 return queue_work(fc_host_work_q(shost), work);
2312 }
2313
2314 /**
2315 * fc_flush_work - Flush a fc_host's workqueue.
2316 * @shost: Pointer to Scsi_Host bound to fc_host.
2317 */
2318 static void
2319 fc_flush_work(struct Scsi_Host *shost)
2320 {
2321 if (!fc_host_work_q(shost)) {
2322 printk(KERN_ERR
2323 "ERROR: FC host '%s' attempted to flush work, "
2324 "when no workqueue created.\n", shost->hostt->name);
2325 dump_stack();
2326 return;
2327 }
2328
2329 flush_workqueue(fc_host_work_q(shost));
2330 }
2331
2332 /**
2333 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2334 * @shost: Pointer to Scsi_Host bound to fc_host.
2335 * @work: Work to queue for execution.
2336 * @delay: jiffies to delay the work queuing
2337 *
2338 * Return value:
2339 * 1 on success / 0 already queued / < 0 for error
2340 */
2341 static int
2342 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2343 unsigned long delay)
2344 {
2345 if (unlikely(!fc_host_devloss_work_q(shost))) {
2346 printk(KERN_ERR
2347 "ERROR: FC host '%s' attempted to queue work, "
2348 "when no workqueue created.\n", shost->hostt->name);
2349 dump_stack();
2350
2351 return -EINVAL;
2352 }
2353
2354 return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2355 }
2356
2357 /**
2358 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2359 * @shost: Pointer to Scsi_Host bound to fc_host.
2360 */
2361 static void
2362 fc_flush_devloss(struct Scsi_Host *shost)
2363 {
2364 if (!fc_host_devloss_work_q(shost)) {
2365 printk(KERN_ERR
2366 "ERROR: FC host '%s' attempted to flush work, "
2367 "when no workqueue created.\n", shost->hostt->name);
2368 dump_stack();
2369 return;
2370 }
2371
2372 flush_workqueue(fc_host_devloss_work_q(shost));
2373 }
2374
2375
2376 /**
2377 * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2378 * @shost: Which &Scsi_Host
2379 *
2380 * This routine is expected to be called immediately preceding the
2381 * a driver's call to scsi_remove_host().
2382 *
2383 * WARNING: A driver utilizing the fc_transport, which fails to call
2384 * this routine prior to scsi_remove_host(), will leave dangling
2385 * objects in /sys/class/fc_remote_ports. Access to any of these
2386 * objects can result in a system crash !!!
2387 *
2388 * Notes:
2389 * This routine assumes no locks are held on entry.
2390 */
2391 void
2392 fc_remove_host(struct Scsi_Host *shost)
2393 {
2394 struct fc_vport *vport = NULL, *next_vport = NULL;
2395 struct fc_rport *rport = NULL, *next_rport = NULL;
2396 struct workqueue_struct *work_q;
2397 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2398 unsigned long flags;
2399
2400 spin_lock_irqsave(shost->host_lock, flags);
2401
2402 /* Remove any vports */
2403 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2404 fc_queue_work(shost, &vport->vport_delete_work);
2405
2406 /* Remove any remote ports */
2407 list_for_each_entry_safe(rport, next_rport,
2408 &fc_host->rports, peers) {
2409 list_del(&rport->peers);
2410 rport->port_state = FC_PORTSTATE_DELETED;
2411 fc_queue_work(shost, &rport->rport_delete_work);
2412 }
2413
2414 list_for_each_entry_safe(rport, next_rport,
2415 &fc_host->rport_bindings, peers) {
2416 list_del(&rport->peers);
2417 rport->port_state = FC_PORTSTATE_DELETED;
2418 fc_queue_work(shost, &rport->rport_delete_work);
2419 }
2420
2421 spin_unlock_irqrestore(shost->host_lock, flags);
2422
2423 /* flush all scan work items */
2424 scsi_flush_work(shost);
2425
2426 /* flush all stgt delete, and rport delete work items, then kill it */
2427 if (fc_host->work_q) {
2428 work_q = fc_host->work_q;
2429 fc_host->work_q = NULL;
2430 destroy_workqueue(work_q);
2431 }
2432
2433 /* flush all devloss work items, then kill it */
2434 if (fc_host->devloss_work_q) {
2435 work_q = fc_host->devloss_work_q;
2436 fc_host->devloss_work_q = NULL;
2437 destroy_workqueue(work_q);
2438 }
2439 }
2440 EXPORT_SYMBOL(fc_remove_host);
2441
2442 static void fc_terminate_rport_io(struct fc_rport *rport)
2443 {
2444 struct Scsi_Host *shost = rport_to_shost(rport);
2445 struct fc_internal *i = to_fc_internal(shost->transportt);
2446
2447 /* Involve the LLDD if possible to terminate all io on the rport. */
2448 if (i->f->terminate_rport_io)
2449 i->f->terminate_rport_io(rport);
2450
2451 /*
2452 * must unblock to flush queued IO. The caller will have set
2453 * the port_state or flags, so that fc_remote_port_chkready will
2454 * fail IO.
2455 */
2456 scsi_target_unblock(&rport->dev);
2457 }
2458
2459 /**
2460 * fc_starget_delete - called to delete the scsi descendants of an rport
2461 * @work: remote port to be operated on.
2462 *
2463 * Deletes target and all sdevs.
2464 */
2465 static void
2466 fc_starget_delete(struct work_struct *work)
2467 {
2468 struct fc_rport *rport =
2469 container_of(work, struct fc_rport, stgt_delete_work);
2470
2471 fc_terminate_rport_io(rport);
2472 scsi_remove_target(&rport->dev);
2473 }
2474
2475
2476 /**
2477 * fc_rport_final_delete - finish rport termination and delete it.
2478 * @work: remote port to be deleted.
2479 */
2480 static void
2481 fc_rport_final_delete(struct work_struct *work)
2482 {
2483 struct fc_rport *rport =
2484 container_of(work, struct fc_rport, rport_delete_work);
2485 struct device *dev = &rport->dev;
2486 struct Scsi_Host *shost = rport_to_shost(rport);
2487 struct fc_internal *i = to_fc_internal(shost->transportt);
2488 unsigned long flags;
2489 int do_callback = 0;
2490
2491 fc_terminate_rport_io(rport);
2492
2493 /*
2494 * if a scan is pending, flush the SCSI Host work_q so that
2495 * that we can reclaim the rport scan work element.
2496 */
2497 if (rport->flags & FC_RPORT_SCAN_PENDING)
2498 scsi_flush_work(shost);
2499
2500 /*
2501 * Cancel any outstanding timers. These should really exist
2502 * only when rmmod'ing the LLDD and we're asking for
2503 * immediate termination of the rports
2504 */
2505 spin_lock_irqsave(shost->host_lock, flags);
2506 if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2507 spin_unlock_irqrestore(shost->host_lock, flags);
2508 if (!cancel_delayed_work(&rport->fail_io_work))
2509 fc_flush_devloss(shost);
2510 if (!cancel_delayed_work(&rport->dev_loss_work))
2511 fc_flush_devloss(shost);
2512 spin_lock_irqsave(shost->host_lock, flags);
2513 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2514 }
2515 spin_unlock_irqrestore(shost->host_lock, flags);
2516
2517 /* Delete SCSI target and sdevs */
2518 if (rport->scsi_target_id != -1)
2519 fc_starget_delete(&rport->stgt_delete_work);
2520
2521 /*
2522 * Notify the driver that the rport is now dead. The LLDD will
2523 * also guarantee that any communication to the rport is terminated
2524 *
2525 * Avoid this call if we already called it when we preserved the
2526 * rport for the binding.
2527 */
2528 spin_lock_irqsave(shost->host_lock, flags);
2529 if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2530 (i->f->dev_loss_tmo_callbk)) {
2531 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2532 do_callback = 1;
2533 }
2534 spin_unlock_irqrestore(shost->host_lock, flags);
2535
2536 if (do_callback)
2537 i->f->dev_loss_tmo_callbk(rport);
2538
2539 fc_bsg_remove(rport->rqst_q);
2540
2541 transport_remove_device(dev);
2542 device_del(dev);
2543 transport_destroy_device(dev);
2544 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2545 put_device(dev); /* for self-reference */
2546 }
2547
2548
2549 /**
2550 * fc_rport_create - allocates and creates a remote FC port.
2551 * @shost: scsi host the remote port is connected to.
2552 * @channel: Channel on shost port connected to.
2553 * @ids: The world wide names, fc address, and FC4 port
2554 * roles for the remote port.
2555 *
2556 * Allocates and creates the remoter port structure, including the
2557 * class and sysfs creation.
2558 *
2559 * Notes:
2560 * This routine assumes no locks are held on entry.
2561 */
2562 static struct fc_rport *
2563 fc_rport_create(struct Scsi_Host *shost, int channel,
2564 struct fc_rport_identifiers *ids)
2565 {
2566 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2567 struct fc_internal *fci = to_fc_internal(shost->transportt);
2568 struct fc_rport *rport;
2569 struct device *dev;
2570 unsigned long flags;
2571 int error;
2572 size_t size;
2573
2574 size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2575 rport = kzalloc(size, GFP_KERNEL);
2576 if (unlikely(!rport)) {
2577 printk(KERN_ERR "%s: allocation failure\n", __func__);
2578 return NULL;
2579 }
2580
2581 rport->maxframe_size = -1;
2582 rport->supported_classes = FC_COS_UNSPECIFIED;
2583 rport->dev_loss_tmo = fc_host->dev_loss_tmo;
2584 memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2585 memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2586 rport->port_id = ids->port_id;
2587 rport->roles = ids->roles;
2588 rport->port_state = FC_PORTSTATE_ONLINE;
2589 if (fci->f->dd_fcrport_size)
2590 rport->dd_data = &rport[1];
2591 rport->channel = channel;
2592 rport->fast_io_fail_tmo = -1;
2593
2594 INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2595 INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2596 INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2597 INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2598 INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2599
2600 spin_lock_irqsave(shost->host_lock, flags);
2601
2602 rport->number = fc_host->next_rport_number++;
2603 if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2604 rport->scsi_target_id = fc_host->next_target_id++;
2605 else
2606 rport->scsi_target_id = -1;
2607 list_add_tail(&rport->peers, &fc_host->rports);
2608 get_device(&shost->shost_gendev); /* for fc_host->rport list */
2609
2610 spin_unlock_irqrestore(shost->host_lock, flags);
2611
2612 dev = &rport->dev;
2613 device_initialize(dev); /* takes self reference */
2614 dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2615 dev->release = fc_rport_dev_release;
2616 dev_set_name(dev, "rport-%d:%d-%d",
2617 shost->host_no, channel, rport->number);
2618 transport_setup_device(dev);
2619
2620 error = device_add(dev);
2621 if (error) {
2622 printk(KERN_ERR "FC Remote Port device_add failed\n");
2623 goto delete_rport;
2624 }
2625 transport_add_device(dev);
2626 transport_configure_device(dev);
2627
2628 fc_bsg_rportadd(shost, rport);
2629 /* ignore any bsg add error - we just can't do sgio */
2630
2631 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2632 /* initiate a scan of the target */
2633 rport->flags |= FC_RPORT_SCAN_PENDING;
2634 scsi_queue_work(shost, &rport->scan_work);
2635 }
2636
2637 return rport;
2638
2639 delete_rport:
2640 transport_destroy_device(dev);
2641 spin_lock_irqsave(shost->host_lock, flags);
2642 list_del(&rport->peers);
2643 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2644 spin_unlock_irqrestore(shost->host_lock, flags);
2645 put_device(dev->parent);
2646 kfree(rport);
2647 return NULL;
2648 }
2649
2650 /**
2651 * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2652 * @shost: scsi host the remote port is connected to.
2653 * @channel: Channel on shost port connected to.
2654 * @ids: The world wide names, fc address, and FC4 port
2655 * roles for the remote port.
2656 *
2657 * The LLDD calls this routine to notify the transport of the existence
2658 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2659 * of the port, it's FC address (port_id), and the FC4 roles that are
2660 * active for the port.
2661 *
2662 * For ports that are FCP targets (aka scsi targets), the FC transport
2663 * maintains consistent target id bindings on behalf of the LLDD.
2664 * A consistent target id binding is an assignment of a target id to
2665 * a remote port identifier, which persists while the scsi host is
2666 * attached. The remote port can disappear, then later reappear, and
2667 * it's target id assignment remains the same. This allows for shifts
2668 * in FC addressing (if binding by wwpn or wwnn) with no apparent
2669 * changes to the scsi subsystem which is based on scsi host number and
2670 * target id values. Bindings are only valid during the attachment of
2671 * the scsi host. If the host detaches, then later re-attaches, target
2672 * id bindings may change.
2673 *
2674 * This routine is responsible for returning a remote port structure.
2675 * The routine will search the list of remote ports it maintains
2676 * internally on behalf of consistent target id mappings. If found, the
2677 * remote port structure will be reused. Otherwise, a new remote port
2678 * structure will be allocated.
2679 *
2680 * Whenever a remote port is allocated, a new fc_remote_port class
2681 * device is created.
2682 *
2683 * Should not be called from interrupt context.
2684 *
2685 * Notes:
2686 * This routine assumes no locks are held on entry.
2687 */
2688 struct fc_rport *
2689 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2690 struct fc_rport_identifiers *ids)
2691 {
2692 struct fc_internal *fci = to_fc_internal(shost->transportt);
2693 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2694 struct fc_rport *rport;
2695 unsigned long flags;
2696 int match = 0;
2697
2698 /* ensure any stgt delete functions are done */
2699 fc_flush_work(shost);
2700
2701 /*
2702 * Search the list of "active" rports, for an rport that has been
2703 * deleted, but we've held off the real delete while the target
2704 * is in a "blocked" state.
2705 */
2706 spin_lock_irqsave(shost->host_lock, flags);
2707
2708 list_for_each_entry(rport, &fc_host->rports, peers) {
2709
2710 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2711 (rport->channel == channel)) {
2712
2713 switch (fc_host->tgtid_bind_type) {
2714 case FC_TGTID_BIND_BY_WWPN:
2715 case FC_TGTID_BIND_NONE:
2716 if (rport->port_name == ids->port_name)
2717 match = 1;
2718 break;
2719 case FC_TGTID_BIND_BY_WWNN:
2720 if (rport->node_name == ids->node_name)
2721 match = 1;
2722 break;
2723 case FC_TGTID_BIND_BY_ID:
2724 if (rport->port_id == ids->port_id)
2725 match = 1;
2726 break;
2727 }
2728
2729 if (match) {
2730
2731 memcpy(&rport->node_name, &ids->node_name,
2732 sizeof(rport->node_name));
2733 memcpy(&rport->port_name, &ids->port_name,
2734 sizeof(rport->port_name));
2735 rport->port_id = ids->port_id;
2736
2737 rport->port_state = FC_PORTSTATE_ONLINE;
2738 rport->roles = ids->roles;
2739
2740 spin_unlock_irqrestore(shost->host_lock, flags);
2741
2742 if (fci->f->dd_fcrport_size)
2743 memset(rport->dd_data, 0,
2744 fci->f->dd_fcrport_size);
2745
2746 /*
2747 * If we were not a target, cancel the
2748 * io terminate and rport timers, and
2749 * we're done.
2750 *
2751 * If we were a target, but our new role
2752 * doesn't indicate a target, leave the
2753 * timers running expecting the role to
2754 * change as the target fully logs in. If
2755 * it doesn't, the target will be torn down.
2756 *
2757 * If we were a target, and our role shows
2758 * we're still a target, cancel the timers
2759 * and kick off a scan.
2760 */
2761
2762 /* was a target, not in roles */
2763 if ((rport->scsi_target_id != -1) &&
2764 (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2765 return rport;
2766
2767 /*
2768 * Stop the fail io and dev_loss timers.
2769 * If they flush, the port_state will
2770 * be checked and will NOOP the function.
2771 */
2772 if (!cancel_delayed_work(&rport->fail_io_work))
2773 fc_flush_devloss(shost);
2774 if (!cancel_delayed_work(&rport->dev_loss_work))
2775 fc_flush_devloss(shost);
2776
2777 spin_lock_irqsave(shost->host_lock, flags);
2778
2779 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2780 FC_RPORT_DEVLOSS_PENDING |
2781 FC_RPORT_DEVLOSS_CALLBK_DONE);
2782
2783 /* if target, initiate a scan */
2784 if (rport->scsi_target_id != -1) {
2785 rport->flags |= FC_RPORT_SCAN_PENDING;
2786 scsi_queue_work(shost,
2787 &rport->scan_work);
2788 spin_unlock_irqrestore(shost->host_lock,
2789 flags);
2790 scsi_target_unblock(&rport->dev);
2791 } else
2792 spin_unlock_irqrestore(shost->host_lock,
2793 flags);
2794
2795 fc_bsg_goose_queue(rport);
2796
2797 return rport;
2798 }
2799 }
2800 }
2801
2802 /*
2803 * Search the bindings array
2804 * Note: if never a FCP target, you won't be on this list
2805 */
2806 if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2807
2808 /* search for a matching consistent binding */
2809
2810 list_for_each_entry(rport, &fc_host->rport_bindings,
2811 peers) {
2812 if (rport->channel != channel)
2813 continue;
2814
2815 switch (fc_host->tgtid_bind_type) {
2816 case FC_TGTID_BIND_BY_WWPN:
2817 if (rport->port_name == ids->port_name)
2818 match = 1;
2819 break;
2820 case FC_TGTID_BIND_BY_WWNN:
2821 if (rport->node_name == ids->node_name)
2822 match = 1;
2823 break;
2824 case FC_TGTID_BIND_BY_ID:
2825 if (rport->port_id == ids->port_id)
2826 match = 1;
2827 break;
2828 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2829 break;
2830 }
2831
2832 if (match) {
2833 list_move_tail(&rport->peers, &fc_host->rports);
2834 break;
2835 }
2836 }
2837
2838 if (match) {
2839 memcpy(&rport->node_name, &ids->node_name,
2840 sizeof(rport->node_name));
2841 memcpy(&rport->port_name, &ids->port_name,
2842 sizeof(rport->port_name));
2843 rport->port_id = ids->port_id;
2844 rport->roles = ids->roles;
2845 rport->port_state = FC_PORTSTATE_ONLINE;
2846 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2847
2848 if (fci->f->dd_fcrport_size)
2849 memset(rport->dd_data, 0,
2850 fci->f->dd_fcrport_size);
2851
2852 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2853 /* initiate a scan of the target */
2854 rport->flags |= FC_RPORT_SCAN_PENDING;
2855 scsi_queue_work(shost, &rport->scan_work);
2856 spin_unlock_irqrestore(shost->host_lock, flags);
2857 scsi_target_unblock(&rport->dev);
2858 } else
2859 spin_unlock_irqrestore(shost->host_lock, flags);
2860
2861 return rport;
2862 }
2863 }
2864
2865 spin_unlock_irqrestore(shost->host_lock, flags);
2866
2867 /* No consistent binding found - create new remote port entry */
2868 rport = fc_rport_create(shost, channel, ids);
2869
2870 return rport;
2871 }
2872 EXPORT_SYMBOL(fc_remote_port_add);
2873
2874
2875 /**
2876 * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2877 * @rport: The remote port that no longer exists
2878 *
2879 * The LLDD calls this routine to notify the transport that a remote
2880 * port is no longer part of the topology. Note: Although a port
2881 * may no longer be part of the topology, it may persist in the remote
2882 * ports displayed by the fc_host. We do this under 2 conditions:
2883 * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2884 * This allows the port to temporarily disappear, then reappear without
2885 * disrupting the SCSI device tree attached to it. During the "blocked"
2886 * period the port will still exist.
2887 * 2) If the port was a scsi target and disappears for longer than we
2888 * expect, we'll delete the port and the tear down the SCSI device tree
2889 * attached to it. However, we want to semi-persist the target id assigned
2890 * to that port if it eventually does exist. The port structure will
2891 * remain (although with minimal information) so that the target id
2892 * bindings remails.
2893 *
2894 * If the remote port is not an FCP Target, it will be fully torn down
2895 * and deallocated, including the fc_remote_port class device.
2896 *
2897 * If the remote port is an FCP Target, the port will be placed in a
2898 * temporary blocked state. From the LLDD's perspective, the rport no
2899 * longer exists. From the SCSI midlayer's perspective, the SCSI target
2900 * exists, but all sdevs on it are blocked from further I/O. The following
2901 * is then expected.
2902 *
2903 * If the remote port does not return (signaled by a LLDD call to
2904 * fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2905 * scsi target is removed - killing all outstanding i/o and removing the
2906 * scsi devices attached ot it. The port structure will be marked Not
2907 * Present and be partially cleared, leaving only enough information to
2908 * recognize the remote port relative to the scsi target id binding if
2909 * it later appears. The port will remain as long as there is a valid
2910 * binding (e.g. until the user changes the binding type or unloads the
2911 * scsi host with the binding).
2912 *
2913 * If the remote port returns within the dev_loss_tmo value (and matches
2914 * according to the target id binding type), the port structure will be
2915 * reused. If it is no longer a SCSI target, the target will be torn
2916 * down. If it continues to be a SCSI target, then the target will be
2917 * unblocked (allowing i/o to be resumed), and a scan will be activated
2918 * to ensure that all luns are detected.
2919 *
2920 * Called from normal process context only - cannot be called from interrupt.
2921 *
2922 * Notes:
2923 * This routine assumes no locks are held on entry.
2924 */
2925 void
2926 fc_remote_port_delete(struct fc_rport *rport)
2927 {
2928 struct Scsi_Host *shost = rport_to_shost(rport);
2929 unsigned long timeout = rport->dev_loss_tmo;
2930 unsigned long flags;
2931
2932 /*
2933 * No need to flush the fc_host work_q's, as all adds are synchronous.
2934 *
2935 * We do need to reclaim the rport scan work element, so eventually
2936 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2937 * there's still a scan pending.
2938 */
2939
2940 spin_lock_irqsave(shost->host_lock, flags);
2941
2942 if (rport->port_state != FC_PORTSTATE_ONLINE) {
2943 spin_unlock_irqrestore(shost->host_lock, flags);
2944 return;
2945 }
2946
2947 /*
2948 * In the past, we if this was not an FCP-Target, we would
2949 * unconditionally just jump to deleting the rport.
2950 * However, rports can be used as node containers by the LLDD,
2951 * and its not appropriate to just terminate the rport at the
2952 * first sign of a loss in connectivity. The LLDD may want to
2953 * send ELS traffic to re-validate the login. If the rport is
2954 * immediately deleted, it makes it inappropriate for a node
2955 * container.
2956 * So... we now unconditionally wait dev_loss_tmo before
2957 * destroying an rport.
2958 */
2959
2960 rport->port_state = FC_PORTSTATE_BLOCKED;
2961
2962 rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2963
2964 spin_unlock_irqrestore(shost->host_lock, flags);
2965
2966 if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2967 shost->active_mode & MODE_TARGET)
2968 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2969
2970 scsi_target_block(&rport->dev);
2971
2972 /* see if we need to kill io faster than waiting for device loss */
2973 if ((rport->fast_io_fail_tmo != -1) &&
2974 (rport->fast_io_fail_tmo < timeout))
2975 fc_queue_devloss_work(shost, &rport->fail_io_work,
2976 rport->fast_io_fail_tmo * HZ);
2977
2978 /* cap the length the devices can be blocked until they are deleted */
2979 fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2980 }
2981 EXPORT_SYMBOL(fc_remote_port_delete);
2982
2983 /**
2984 * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
2985 * @rport: The remote port that changed.
2986 * @roles: New roles for this port.
2987 *
2988 * Description: The LLDD calls this routine to notify the transport that the
2989 * roles on a remote port may have changed. The largest effect of this is
2990 * if a port now becomes a FCP Target, it must be allocated a
2991 * scsi target id. If the port is no longer a FCP target, any
2992 * scsi target id value assigned to it will persist in case the
2993 * role changes back to include FCP Target. No changes in the scsi
2994 * midlayer will be invoked if the role changes (in the expectation
2995 * that the role will be resumed. If it doesn't normal error processing
2996 * will take place).
2997 *
2998 * Should not be called from interrupt context.
2999 *
3000 * Notes:
3001 * This routine assumes no locks are held on entry.
3002 */
3003 void
3004 fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
3005 {
3006 struct Scsi_Host *shost = rport_to_shost(rport);
3007 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3008 unsigned long flags;
3009 int create = 0;
3010 int ret;
3011
3012 spin_lock_irqsave(shost->host_lock, flags);
3013 if (roles & FC_PORT_ROLE_FCP_TARGET) {
3014 if (rport->scsi_target_id == -1) {
3015 rport->scsi_target_id = fc_host->next_target_id++;
3016 create = 1;
3017 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3018 create = 1;
3019 } else if (shost->active_mode & MODE_TARGET) {
3020 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
3021 (char *)&rport->node_name);
3022 if (ret)
3023 printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
3024 ret);
3025 }
3026
3027 rport->roles = roles;
3028
3029 spin_unlock_irqrestore(shost->host_lock, flags);
3030
3031 if (create) {
3032 /*
3033 * There may have been a delete timer running on the
3034 * port. Ensure that it is cancelled as we now know
3035 * the port is an FCP Target.
3036 * Note: we know the rport is exists and in an online
3037 * state as the LLDD would not have had an rport
3038 * reference to pass us.
3039 *
3040 * Take no action on the del_timer failure as the state
3041 * machine state change will validate the
3042 * transaction.
3043 */
3044 if (!cancel_delayed_work(&rport->fail_io_work))
3045 fc_flush_devloss(shost);
3046 if (!cancel_delayed_work(&rport->dev_loss_work))
3047 fc_flush_devloss(shost);
3048
3049 spin_lock_irqsave(shost->host_lock, flags);
3050 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3051 FC_RPORT_DEVLOSS_PENDING);
3052 spin_unlock_irqrestore(shost->host_lock, flags);
3053
3054 /* ensure any stgt delete functions are done */
3055 fc_flush_work(shost);
3056
3057 /* initiate a scan of the target */
3058 spin_lock_irqsave(shost->host_lock, flags);
3059 rport->flags |= FC_RPORT_SCAN_PENDING;
3060 scsi_queue_work(shost, &rport->scan_work);
3061 spin_unlock_irqrestore(shost->host_lock, flags);
3062 scsi_target_unblock(&rport->dev);
3063 }
3064 }
3065 EXPORT_SYMBOL(fc_remote_port_rolechg);
3066
3067 /**
3068 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3069 * @work: rport target that failed to reappear in the allotted time.
3070 *
3071 * Description: An attempt to delete a remote port blocks, and if it fails
3072 * to return in the allotted time this gets called.
3073 */
3074 static void
3075 fc_timeout_deleted_rport(struct work_struct *work)
3076 {
3077 struct fc_rport *rport =
3078 container_of(work, struct fc_rport, dev_loss_work.work);
3079 struct Scsi_Host *shost = rport_to_shost(rport);
3080 struct fc_internal *i = to_fc_internal(shost->transportt);
3081 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3082 unsigned long flags;
3083 int do_callback = 0;
3084
3085 spin_lock_irqsave(shost->host_lock, flags);
3086
3087 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3088
3089 /*
3090 * If the port is ONLINE, then it came back. If it was a SCSI
3091 * target, validate it still is. If not, tear down the
3092 * scsi_target on it.
3093 */
3094 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3095 (rport->scsi_target_id != -1) &&
3096 !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3097 dev_printk(KERN_ERR, &rport->dev,
3098 "blocked FC remote port time out: no longer"
3099 " a FCP target, removing starget\n");
3100 spin_unlock_irqrestore(shost->host_lock, flags);
3101 scsi_target_unblock(&rport->dev);
3102 fc_queue_work(shost, &rport->stgt_delete_work);
3103 return;
3104 }
3105
3106 /* NOOP state - we're flushing workq's */
3107 if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3108 spin_unlock_irqrestore(shost->host_lock, flags);
3109 dev_printk(KERN_ERR, &rport->dev,
3110 "blocked FC remote port time out: leaving"
3111 " rport%s alone\n",
3112 (rport->scsi_target_id != -1) ? " and starget" : "");
3113 return;
3114 }
3115
3116 if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3117 (rport->scsi_target_id == -1)) {
3118 list_del(&rport->peers);
3119 rport->port_state = FC_PORTSTATE_DELETED;
3120 dev_printk(KERN_ERR, &rport->dev,
3121 "blocked FC remote port time out: removing"
3122 " rport%s\n",
3123 (rport->scsi_target_id != -1) ? " and starget" : "");
3124 fc_queue_work(shost, &rport->rport_delete_work);
3125 spin_unlock_irqrestore(shost->host_lock, flags);
3126 return;
3127 }
3128
3129 dev_printk(KERN_ERR, &rport->dev,
3130 "blocked FC remote port time out: removing target and "
3131 "saving binding\n");
3132
3133 list_move_tail(&rport->peers, &fc_host->rport_bindings);
3134
3135 /*
3136 * Note: We do not remove or clear the hostdata area. This allows
3137 * host-specific target data to persist along with the
3138 * scsi_target_id. It's up to the host to manage it's hostdata area.
3139 */
3140
3141 /*
3142 * Reinitialize port attributes that may change if the port comes back.
3143 */
3144 rport->maxframe_size = -1;
3145 rport->supported_classes = FC_COS_UNSPECIFIED;
3146 rport->roles = FC_PORT_ROLE_UNKNOWN;
3147 rport->port_state = FC_PORTSTATE_NOTPRESENT;
3148 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3149
3150 /*
3151 * Pre-emptively kill I/O rather than waiting for the work queue
3152 * item to teardown the starget. (FCOE libFC folks prefer this
3153 * and to have the rport_port_id still set when it's done).
3154 */
3155 spin_unlock_irqrestore(shost->host_lock, flags);
3156 fc_terminate_rport_io(rport);
3157
3158 spin_lock_irqsave(shost->host_lock, flags);
3159
3160 if (rport->port_state == FC_PORTSTATE_NOTPRESENT) { /* still missing */
3161
3162 /* remove the identifiers that aren't used in the consisting binding */
3163 switch (fc_host->tgtid_bind_type) {
3164 case FC_TGTID_BIND_BY_WWPN:
3165 rport->node_name = -1;
3166 rport->port_id = -1;
3167 break;
3168 case FC_TGTID_BIND_BY_WWNN:
3169 rport->port_name = -1;
3170 rport->port_id = -1;
3171 break;
3172 case FC_TGTID_BIND_BY_ID:
3173 rport->node_name = -1;
3174 rport->port_name = -1;
3175 break;
3176 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3177 break;
3178 }
3179
3180 /*
3181 * As this only occurs if the remote port (scsi target)
3182 * went away and didn't come back - we'll remove
3183 * all attached scsi devices.
3184 */
3185 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3186 fc_queue_work(shost, &rport->stgt_delete_work);
3187
3188 do_callback = 1;
3189 }
3190
3191 spin_unlock_irqrestore(shost->host_lock, flags);
3192
3193 /*
3194 * Notify the driver that the rport is now dead. The LLDD will
3195 * also guarantee that any communication to the rport is terminated
3196 *
3197 * Note: we set the CALLBK_DONE flag above to correspond
3198 */
3199 if (do_callback && i->f->dev_loss_tmo_callbk)
3200 i->f->dev_loss_tmo_callbk(rport);
3201 }
3202
3203
3204 /**
3205 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3206 * @work: rport to terminate io on.
3207 *
3208 * Notes: Only requests the failure of the io, not that all are flushed
3209 * prior to returning.
3210 */
3211 static void
3212 fc_timeout_fail_rport_io(struct work_struct *work)
3213 {
3214 struct fc_rport *rport =
3215 container_of(work, struct fc_rport, fail_io_work.work);
3216
3217 if (rport->port_state != FC_PORTSTATE_BLOCKED)
3218 return;
3219
3220 rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3221 fc_terminate_rport_io(rport);
3222 }
3223
3224 /**
3225 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3226 * @work: remote port to be scanned.
3227 */
3228 static void
3229 fc_scsi_scan_rport(struct work_struct *work)
3230 {
3231 struct fc_rport *rport =
3232 container_of(work, struct fc_rport, scan_work);
3233 struct Scsi_Host *shost = rport_to_shost(rport);
3234 struct fc_internal *i = to_fc_internal(shost->transportt);
3235 unsigned long flags;
3236
3237 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3238 (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3239 !(i->f->disable_target_scan)) {
3240 scsi_scan_target(&rport->dev, rport->channel,
3241 rport->scsi_target_id, SCAN_WILD_CARD, 1);
3242 }
3243
3244 spin_lock_irqsave(shost->host_lock, flags);
3245 rport->flags &= ~FC_RPORT_SCAN_PENDING;
3246 spin_unlock_irqrestore(shost->host_lock, flags);
3247 }
3248
3249 /**
3250 * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3251 * @cmnd: SCSI command that scsi_eh is trying to recover
3252 *
3253 * This routine can be called from a FC LLD scsi_eh callback. It
3254 * blocks the scsi_eh thread until the fc_rport leaves the
3255 * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3256 * necessary to avoid the scsi_eh failing recovery actions for blocked
3257 * rports which would lead to offlined SCSI devices.
3258 *
3259 * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3260 * FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3261 * passed back to scsi_eh.
3262 */
3263 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3264 {
3265 struct Scsi_Host *shost = cmnd->device->host;
3266 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3267 unsigned long flags;
3268
3269 spin_lock_irqsave(shost->host_lock, flags);
3270 while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3271 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3272 spin_unlock_irqrestore(shost->host_lock, flags);
3273 msleep(1000);
3274 spin_lock_irqsave(shost->host_lock, flags);
3275 }
3276 spin_unlock_irqrestore(shost->host_lock, flags);
3277
3278 if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3279 return FAST_IO_FAIL;
3280
3281 return 0;
3282 }
3283 EXPORT_SYMBOL(fc_block_scsi_eh);
3284
3285 /**
3286 * fc_vport_setup - allocates and creates a FC virtual port.
3287 * @shost: scsi host the virtual port is connected to.
3288 * @channel: Channel on shost port connected to.
3289 * @pdev: parent device for vport
3290 * @ids: The world wide names, FC4 port roles, etc for
3291 * the virtual port.
3292 * @ret_vport: The pointer to the created vport.
3293 *
3294 * Allocates and creates the vport structure, calls the parent host
3295 * to instantiate the vport, the completes w/ class and sysfs creation.
3296 *
3297 * Notes:
3298 * This routine assumes no locks are held on entry.
3299 */
3300 static int
3301 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3302 struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
3303 {
3304 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3305 struct fc_internal *fci = to_fc_internal(shost->transportt);
3306 struct fc_vport *vport;
3307 struct device *dev;
3308 unsigned long flags;
3309 size_t size;
3310 int error;
3311
3312 *ret_vport = NULL;
3313
3314 if ( ! fci->f->vport_create)
3315 return -ENOENT;
3316
3317 size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3318 vport = kzalloc(size, GFP_KERNEL);
3319 if (unlikely(!vport)) {
3320 printk(KERN_ERR "%s: allocation failure\n", __func__);
3321 return -ENOMEM;
3322 }
3323
3324 vport->vport_state = FC_VPORT_UNKNOWN;
3325 vport->vport_last_state = FC_VPORT_UNKNOWN;
3326 vport->node_name = ids->node_name;
3327 vport->port_name = ids->port_name;
3328 vport->roles = ids->roles;
3329 vport->vport_type = ids->vport_type;
3330 if (fci->f->dd_fcvport_size)
3331 vport->dd_data = &vport[1];
3332 vport->shost = shost;
3333 vport->channel = channel;
3334 vport->flags = FC_VPORT_CREATING;
3335 INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3336
3337 spin_lock_irqsave(shost->host_lock, flags);
3338
3339 if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3340 spin_unlock_irqrestore(shost->host_lock, flags);
3341 kfree(vport);
3342 return -ENOSPC;
3343 }
3344 fc_host->npiv_vports_inuse++;
3345 vport->number = fc_host->next_vport_number++;
3346 list_add_tail(&vport->peers, &fc_host->vports);
3347 get_device(&shost->shost_gendev); /* for fc_host->vport list */
3348
3349 spin_unlock_irqrestore(shost->host_lock, flags);
3350
3351 dev = &vport->dev;
3352 device_initialize(dev); /* takes self reference */
3353 dev->parent = get_device(pdev); /* takes parent reference */
3354 dev->release = fc_vport_dev_release;
3355 dev_set_name(dev, "vport-%d:%d-%d",
3356 shost->host_no, channel, vport->number);
3357 transport_setup_device(dev);
3358
3359 error = device_add(dev);
3360 if (error) {
3361 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3362 goto delete_vport;
3363 }
3364 transport_add_device(dev);
3365 transport_configure_device(dev);
3366
3367 error = fci->f->vport_create(vport, ids->disable);
3368 if (error) {
3369 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3370 goto delete_vport_all;
3371 }
3372
3373 /*
3374 * if the parent isn't the physical adapter's Scsi_Host, ensure
3375 * the Scsi_Host at least contains ia symlink to the vport.
3376 */
3377 if (pdev != &shost->shost_gendev) {
3378 error = sysfs_create_link(&shost->shost_gendev.kobj,
3379 &dev->kobj, dev_name(dev));
3380 if (error)
3381 printk(KERN_ERR
3382 "%s: Cannot create vport symlinks for "
3383 "%s, err=%d\n",
3384 __func__, dev_name(dev), error);
3385 }
3386 spin_lock_irqsave(shost->host_lock, flags);
3387 vport->flags &= ~FC_VPORT_CREATING;
3388 spin_unlock_irqrestore(shost->host_lock, flags);
3389
3390 dev_printk(KERN_NOTICE, pdev,
3391 "%s created via shost%d channel %d\n", dev_name(dev),
3392 shost->host_no, channel);
3393
3394 *ret_vport = vport;
3395
3396 return 0;
3397
3398 delete_vport_all:
3399 transport_remove_device(dev);
3400 device_del(dev);
3401 delete_vport:
3402 transport_destroy_device(dev);
3403 spin_lock_irqsave(shost->host_lock, flags);
3404 list_del(&vport->peers);
3405 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3406 fc_host->npiv_vports_inuse--;
3407 spin_unlock_irqrestore(shost->host_lock, flags);
3408 put_device(dev->parent);
3409 kfree(vport);
3410
3411 return error;
3412 }
3413
3414 /**
3415 * fc_vport_create - Admin App or LLDD requests creation of a vport
3416 * @shost: scsi host the virtual port is connected to.
3417 * @channel: channel on shost port connected to.
3418 * @ids: The world wide names, FC4 port roles, etc for
3419 * the virtual port.
3420 *
3421 * Notes:
3422 * This routine assumes no locks are held on entry.
3423 */
3424 struct fc_vport *
3425 fc_vport_create(struct Scsi_Host *shost, int channel,
3426 struct fc_vport_identifiers *ids)
3427 {
3428 int stat;
3429 struct fc_vport *vport;
3430
3431 stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3432 ids, &vport);
3433 return stat ? NULL : vport;
3434 }
3435 EXPORT_SYMBOL(fc_vport_create);
3436
3437 /**
3438 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3439 * @vport: fc_vport to be terminated
3440 *
3441 * Calls the LLDD vport_delete() function, then deallocates and removes
3442 * the vport from the shost and object tree.
3443 *
3444 * Notes:
3445 * This routine assumes no locks are held on entry.
3446 */
3447 int
3448 fc_vport_terminate(struct fc_vport *vport)
3449 {
3450 struct Scsi_Host *shost = vport_to_shost(vport);
3451 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3452 struct fc_internal *i = to_fc_internal(shost->transportt);
3453 struct device *dev = &vport->dev;
3454 unsigned long flags;
3455 int stat;
3456
3457 if (i->f->vport_delete)
3458 stat = i->f->vport_delete(vport);
3459 else
3460 stat = -ENOENT;
3461
3462 spin_lock_irqsave(shost->host_lock, flags);
3463 vport->flags &= ~FC_VPORT_DELETING;
3464 if (!stat) {
3465 vport->flags |= FC_VPORT_DELETED;
3466 list_del(&vport->peers);
3467 fc_host->npiv_vports_inuse--;
3468 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3469 }
3470 spin_unlock_irqrestore(shost->host_lock, flags);
3471
3472 if (stat)
3473 return stat;
3474
3475 if (dev->parent != &shost->shost_gendev)
3476 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3477 transport_remove_device(dev);
3478 device_del(dev);
3479 transport_destroy_device(dev);
3480
3481 /*
3482 * Removing our self-reference should mean our
3483 * release function gets called, which will drop the remaining
3484 * parent reference and free the data structure.
3485 */
3486 put_device(dev); /* for self-reference */
3487
3488 return 0; /* SUCCESS */
3489 }
3490 EXPORT_SYMBOL(fc_vport_terminate);
3491
3492 /**
3493 * fc_vport_sched_delete - workq-based delete request for a vport
3494 * @work: vport to be deleted.
3495 */
3496 static void
3497 fc_vport_sched_delete(struct work_struct *work)
3498 {
3499 struct fc_vport *vport =
3500 container_of(work, struct fc_vport, vport_delete_work);
3501 int stat;
3502
3503 stat = fc_vport_terminate(vport);
3504 if (stat)
3505 dev_printk(KERN_ERR, vport->dev.parent,
3506 "%s: %s could not be deleted created via "
3507 "shost%d channel %d - error %d\n", __func__,
3508 dev_name(&vport->dev), vport->shost->host_no,
3509 vport->channel, stat);
3510 }
3511
3512
3513 /*
3514 * BSG support
3515 */
3516
3517
3518 /**
3519 * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3520 * @job: fc_bsg_job that is to be torn down
3521 */
3522 static void
3523 fc_destroy_bsgjob(struct fc_bsg_job *job)
3524 {
3525 unsigned long flags;
3526
3527 spin_lock_irqsave(&job->job_lock, flags);
3528 if (job->ref_cnt) {
3529 spin_unlock_irqrestore(&job->job_lock, flags);
3530 return;
3531 }
3532 spin_unlock_irqrestore(&job->job_lock, flags);
3533
3534 put_device(job->dev); /* release reference for the request */
3535
3536 kfree(job->request_payload.sg_list);
3537 kfree(job->reply_payload.sg_list);
3538 kfree(job);
3539 }
3540
3541 /**
3542 * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3543 * completed
3544 * @job: fc_bsg_job that is complete
3545 */
3546 static void
3547 fc_bsg_jobdone(struct fc_bsg_job *job)
3548 {
3549 struct request *req = job->req;
3550 struct request *rsp = req->next_rq;
3551 int err;
3552
3553 err = job->req->errors = job->reply->result;
3554
3555 if (err < 0)
3556 /* we're only returning the result field in the reply */
3557 job->req->sense_len = sizeof(uint32_t);
3558 else
3559 job->req->sense_len = job->reply_len;
3560
3561 /* we assume all request payload was transferred, residual == 0 */
3562 req->resid_len = 0;
3563
3564 if (rsp) {
3565 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3566
3567 /* set reply (bidi) residual */
3568 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3569 rsp->resid_len);
3570 }
3571 blk_complete_request(req);
3572 }
3573
3574 /**
3575 * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3576 * @rq: BSG request that holds the job to be destroyed
3577 */
3578 static void fc_bsg_softirq_done(struct request *rq)
3579 {
3580 struct fc_bsg_job *job = rq->special;
3581 unsigned long flags;
3582
3583 spin_lock_irqsave(&job->job_lock, flags);
3584 job->state_flags |= FC_RQST_STATE_DONE;
3585 job->ref_cnt--;
3586 spin_unlock_irqrestore(&job->job_lock, flags);
3587
3588 blk_end_request_all(rq, rq->errors);
3589 fc_destroy_bsgjob(job);
3590 }
3591
3592 /**
3593 * fc_bsg_job_timeout - handler for when a bsg request timesout
3594 * @req: request that timed out
3595 */
3596 static enum blk_eh_timer_return
3597 fc_bsg_job_timeout(struct request *req)
3598 {
3599 struct fc_bsg_job *job = (void *) req->special;
3600 struct Scsi_Host *shost = job->shost;
3601 struct fc_internal *i = to_fc_internal(shost->transportt);
3602 unsigned long flags;
3603 int err = 0, done = 0;
3604
3605 if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3606 return BLK_EH_RESET_TIMER;
3607
3608 spin_lock_irqsave(&job->job_lock, flags);
3609 if (job->state_flags & FC_RQST_STATE_DONE)
3610 done = 1;
3611 else
3612 job->ref_cnt++;
3613 spin_unlock_irqrestore(&job->job_lock, flags);
3614
3615 if (!done && i->f->bsg_timeout) {
3616 /* call LLDD to abort the i/o as it has timed out */
3617 err = i->f->bsg_timeout(job);
3618 if (err == -EAGAIN) {
3619 job->ref_cnt--;
3620 return BLK_EH_RESET_TIMER;
3621 } else if (err)
3622 printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3623 "abort failed with status %d\n", err);
3624 }
3625
3626 /* the blk_end_sync_io() doesn't check the error */
3627 if (done)
3628 return BLK_EH_NOT_HANDLED;
3629 else
3630 return BLK_EH_HANDLED;
3631 }
3632
3633 static int
3634 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3635 {
3636 size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3637
3638 BUG_ON(!req->nr_phys_segments);
3639
3640 buf->sg_list = kzalloc(sz, GFP_KERNEL);
3641 if (!buf->sg_list)
3642 return -ENOMEM;
3643 sg_init_table(buf->sg_list, req->nr_phys_segments);
3644 buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3645 buf->payload_len = blk_rq_bytes(req);
3646 return 0;
3647 }
3648
3649
3650 /**
3651 * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3652 * bsg request
3653 * @shost: SCSI Host corresponding to the bsg object
3654 * @rport: (optional) FC Remote Port corresponding to the bsg object
3655 * @req: BSG request that needs a job structure
3656 */
3657 static int
3658 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3659 struct request *req)
3660 {
3661 struct fc_internal *i = to_fc_internal(shost->transportt);
3662 struct request *rsp = req->next_rq;
3663 struct fc_bsg_job *job;
3664 int ret;
3665
3666 BUG_ON(req->special);
3667
3668 job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3669 GFP_KERNEL);
3670 if (!job)
3671 return -ENOMEM;
3672
3673 /*
3674 * Note: this is a bit silly.
3675 * The request gets formatted as a SGIO v4 ioctl request, which
3676 * then gets reformatted as a blk request, which then gets
3677 * reformatted as a fc bsg request. And on completion, we have
3678 * to wrap return results such that SGIO v4 thinks it was a scsi
3679 * status. I hope this was all worth it.
3680 */
3681
3682 req->special = job;
3683 job->shost = shost;
3684 job->rport = rport;
3685 job->req = req;
3686 if (i->f->dd_bsg_size)
3687 job->dd_data = (void *)&job[1];
3688 spin_lock_init(&job->job_lock);
3689 job->request = (struct fc_bsg_request *)req->cmd;
3690 job->request_len = req->cmd_len;
3691 job->reply = req->sense;
3692 job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3693 * allocated */
3694 if (req->bio) {
3695 ret = fc_bsg_map_buffer(&job->request_payload, req);
3696 if (ret)
3697 goto failjob_rls_job;
3698 }
3699 if (rsp && rsp->bio) {
3700 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3701 if (ret)
3702 goto failjob_rls_rqst_payload;
3703 }
3704 job->job_done = fc_bsg_jobdone;
3705 if (rport)
3706 job->dev = &rport->dev;
3707 else
3708 job->dev = &shost->shost_gendev;
3709 get_device(job->dev); /* take a reference for the request */
3710
3711 job->ref_cnt = 1;
3712
3713 return 0;
3714
3715
3716 failjob_rls_rqst_payload:
3717 kfree(job->request_payload.sg_list);
3718 failjob_rls_job:
3719 kfree(job);
3720 return -ENOMEM;
3721 }
3722
3723
3724 enum fc_dispatch_result {
3725 FC_DISPATCH_BREAK, /* on return, q is locked, break from q loop */
3726 FC_DISPATCH_LOCKED, /* on return, q is locked, continue on */
3727 FC_DISPATCH_UNLOCKED, /* on return, q is unlocked, continue on */
3728 };
3729
3730
3731 /**
3732 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3733 * @q: fc host request queue
3734 * @shost: scsi host rport attached to
3735 * @job: bsg job to be processed
3736 */
3737 static enum fc_dispatch_result
3738 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3739 struct fc_bsg_job *job)
3740 {
3741 struct fc_internal *i = to_fc_internal(shost->transportt);
3742 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3743 int ret;
3744
3745 /* Validate the host command */
3746 switch (job->request->msgcode) {
3747 case FC_BSG_HST_ADD_RPORT:
3748 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3749 break;
3750
3751 case FC_BSG_HST_DEL_RPORT:
3752 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3753 break;
3754
3755 case FC_BSG_HST_ELS_NOLOGIN:
3756 cmdlen += sizeof(struct fc_bsg_host_els);
3757 /* there better be a xmt and rcv payloads */
3758 if ((!job->request_payload.payload_len) ||
3759 (!job->reply_payload.payload_len)) {
3760 ret = -EINVAL;
3761 goto fail_host_msg;
3762 }
3763 break;
3764
3765 case FC_BSG_HST_CT:
3766 cmdlen += sizeof(struct fc_bsg_host_ct);
3767 /* there better be xmt and rcv payloads */
3768 if ((!job->request_payload.payload_len) ||
3769 (!job->reply_payload.payload_len)) {
3770 ret = -EINVAL;
3771 goto fail_host_msg;
3772 }
3773 break;
3774
3775 case FC_BSG_HST_VENDOR:
3776 cmdlen += sizeof(struct fc_bsg_host_vendor);
3777 if ((shost->hostt->vendor_id == 0L) ||
3778 (job->request->rqst_data.h_vendor.vendor_id !=
3779 shost->hostt->vendor_id)) {
3780 ret = -ESRCH;
3781 goto fail_host_msg;
3782 }
3783 break;
3784
3785 default:
3786 ret = -EBADR;
3787 goto fail_host_msg;
3788 }
3789
3790 /* check if we really have all the request data needed */
3791 if (job->request_len < cmdlen) {
3792 ret = -ENOMSG;
3793 goto fail_host_msg;
3794 }
3795
3796 ret = i->f->bsg_request(job);
3797 if (!ret)
3798 return FC_DISPATCH_UNLOCKED;
3799
3800 fail_host_msg:
3801 /* return the errno failure code as the only status */
3802 BUG_ON(job->reply_len < sizeof(uint32_t));
3803 job->reply->reply_payload_rcv_len = 0;
3804 job->reply->result = ret;
3805 job->reply_len = sizeof(uint32_t);
3806 fc_bsg_jobdone(job);
3807 return FC_DISPATCH_UNLOCKED;
3808 }
3809
3810
3811 /*
3812 * fc_bsg_goose_queue - restart rport queue in case it was stopped
3813 * @rport: rport to be restarted
3814 */
3815 static void
3816 fc_bsg_goose_queue(struct fc_rport *rport)
3817 {
3818 if (!rport->rqst_q)
3819 return;
3820
3821 /*
3822 * This get/put dance makes no sense
3823 */
3824 get_device(&rport->dev);
3825 blk_run_queue_async(rport->rqst_q);
3826 put_device(&rport->dev);
3827 }
3828
3829 /**
3830 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3831 * @q: rport request queue
3832 * @shost: scsi host rport attached to
3833 * @rport: rport request destined to
3834 * @job: bsg job to be processed
3835 */
3836 static enum fc_dispatch_result
3837 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3838 struct fc_rport *rport, struct fc_bsg_job *job)
3839 {
3840 struct fc_internal *i = to_fc_internal(shost->transportt);
3841 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3842 int ret;
3843
3844 /* Validate the rport command */
3845 switch (job->request->msgcode) {
3846 case FC_BSG_RPT_ELS:
3847 cmdlen += sizeof(struct fc_bsg_rport_els);
3848 goto check_bidi;
3849
3850 case FC_BSG_RPT_CT:
3851 cmdlen += sizeof(struct fc_bsg_rport_ct);
3852 check_bidi:
3853 /* there better be xmt and rcv payloads */
3854 if ((!job->request_payload.payload_len) ||
3855 (!job->reply_payload.payload_len)) {
3856 ret = -EINVAL;
3857 goto fail_rport_msg;
3858 }
3859 break;
3860 default:
3861 ret = -EBADR;
3862 goto fail_rport_msg;
3863 }
3864
3865 /* check if we really have all the request data needed */
3866 if (job->request_len < cmdlen) {
3867 ret = -ENOMSG;
3868 goto fail_rport_msg;
3869 }
3870
3871 ret = i->f->bsg_request(job);
3872 if (!ret)
3873 return FC_DISPATCH_UNLOCKED;
3874
3875 fail_rport_msg:
3876 /* return the errno failure code as the only status */
3877 BUG_ON(job->reply_len < sizeof(uint32_t));
3878 job->reply->reply_payload_rcv_len = 0;
3879 job->reply->result = ret;
3880 job->reply_len = sizeof(uint32_t);
3881 fc_bsg_jobdone(job);
3882 return FC_DISPATCH_UNLOCKED;
3883 }
3884
3885
3886 /**
3887 * fc_bsg_request_handler - generic handler for bsg requests
3888 * @q: request queue to manage
3889 * @shost: Scsi_Host related to the bsg object
3890 * @rport: FC remote port related to the bsg object (optional)
3891 * @dev: device structure for bsg object
3892 */
3893 static void
3894 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3895 struct fc_rport *rport, struct device *dev)
3896 {
3897 struct request *req;
3898 struct fc_bsg_job *job;
3899 enum fc_dispatch_result ret;
3900
3901 if (!get_device(dev))
3902 return;
3903
3904 while (1) {
3905 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
3906 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3907 break;
3908
3909 req = blk_fetch_request(q);
3910 if (!req)
3911 break;
3912
3913 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3914 req->errors = -ENXIO;
3915 spin_unlock_irq(q->queue_lock);
3916 blk_end_request_all(req, -ENXIO);
3917 spin_lock_irq(q->queue_lock);
3918 continue;
3919 }
3920
3921 spin_unlock_irq(q->queue_lock);
3922
3923 ret = fc_req_to_bsgjob(shost, rport, req);
3924 if (ret) {
3925 req->errors = ret;
3926 blk_end_request_all(req, ret);
3927 spin_lock_irq(q->queue_lock);
3928 continue;
3929 }
3930
3931 job = req->special;
3932
3933 /* check if we have the msgcode value at least */
3934 if (job->request_len < sizeof(uint32_t)) {
3935 BUG_ON(job->reply_len < sizeof(uint32_t));
3936 job->reply->reply_payload_rcv_len = 0;
3937 job->reply->result = -ENOMSG;
3938 job->reply_len = sizeof(uint32_t);
3939 fc_bsg_jobdone(job);
3940 spin_lock_irq(q->queue_lock);
3941 continue;
3942 }
3943
3944 /* the dispatch routines will unlock the queue_lock */
3945 if (rport)
3946 ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3947 else
3948 ret = fc_bsg_host_dispatch(q, shost, job);
3949
3950 /* did dispatcher hit state that can't process any more */
3951 if (ret == FC_DISPATCH_BREAK)
3952 break;
3953
3954 /* did dispatcher had released the lock */
3955 if (ret == FC_DISPATCH_UNLOCKED)
3956 spin_lock_irq(q->queue_lock);
3957 }
3958
3959 spin_unlock_irq(q->queue_lock);
3960 put_device(dev);
3961 spin_lock_irq(q->queue_lock);
3962 }
3963
3964
3965 /**
3966 * fc_bsg_host_handler - handler for bsg requests for a fc host
3967 * @q: fc host request queue
3968 */
3969 static void
3970 fc_bsg_host_handler(struct request_queue *q)
3971 {
3972 struct Scsi_Host *shost = q->queuedata;
3973
3974 fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
3975 }
3976
3977
3978 /**
3979 * fc_bsg_rport_handler - handler for bsg requests for a fc rport
3980 * @q: rport request queue
3981 */
3982 static void
3983 fc_bsg_rport_handler(struct request_queue *q)
3984 {
3985 struct fc_rport *rport = q->queuedata;
3986 struct Scsi_Host *shost = rport_to_shost(rport);
3987
3988 fc_bsg_request_handler(q, shost, rport, &rport->dev);
3989 }
3990
3991
3992 /**
3993 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
3994 * @shost: shost for fc_host
3995 * @fc_host: fc_host adding the structures to
3996 */
3997 static int
3998 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
3999 {
4000 struct device *dev = &shost->shost_gendev;
4001 struct fc_internal *i = to_fc_internal(shost->transportt);
4002 struct request_queue *q;
4003 int err;
4004 char bsg_name[20];
4005
4006 fc_host->rqst_q = NULL;
4007
4008 if (!i->f->bsg_request)
4009 return -ENOTSUPP;
4010
4011 snprintf(bsg_name, sizeof(bsg_name),
4012 "fc_host%d", shost->host_no);
4013
4014 q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
4015 if (!q) {
4016 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4017 "initialize - no request queue\n",
4018 shost->host_no);
4019 return -ENOMEM;
4020 }
4021
4022 q->queuedata = shost;
4023 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4024 blk_queue_softirq_done(q, fc_bsg_softirq_done);
4025 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4026 blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4027
4028 err = bsg_register_queue(q, dev, bsg_name, NULL);
4029 if (err) {
4030 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4031 "initialize - register queue\n",
4032 shost->host_no);
4033 blk_cleanup_queue(q);
4034 return err;
4035 }
4036
4037 fc_host->rqst_q = q;
4038 return 0;
4039 }
4040
4041
4042 /**
4043 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4044 * @shost: shost that rport is attached to
4045 * @rport: rport that the bsg hooks are being attached to
4046 */
4047 static int
4048 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4049 {
4050 struct device *dev = &rport->dev;
4051 struct fc_internal *i = to_fc_internal(shost->transportt);
4052 struct request_queue *q;
4053 int err;
4054
4055 rport->rqst_q = NULL;
4056
4057 if (!i->f->bsg_request)
4058 return -ENOTSUPP;
4059
4060 q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
4061 if (!q) {
4062 printk(KERN_ERR "%s: bsg interface failed to "
4063 "initialize - no request queue\n",
4064 dev->kobj.name);
4065 return -ENOMEM;
4066 }
4067
4068 q->queuedata = rport;
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, BLK_DEFAULT_SG_TIMEOUT);
4073
4074 err = bsg_register_queue(q, dev, NULL, NULL);
4075 if (err) {
4076 printk(KERN_ERR "%s: bsg interface failed to "
4077 "initialize - register queue\n",
4078 dev->kobj.name);
4079 blk_cleanup_queue(q);
4080 return err;
4081 }
4082
4083 rport->rqst_q = q;
4084 return 0;
4085 }
4086
4087
4088 /**
4089 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4090 * @q: the request_queue that is to be torn down.
4091 *
4092 * Notes:
4093 * Before unregistering the queue empty any requests that are blocked
4094 *
4095 *
4096 */
4097 static void
4098 fc_bsg_remove(struct request_queue *q)
4099 {
4100 struct request *req; /* block request */
4101 int counts; /* totals for request_list count and starved */
4102
4103 if (q) {
4104 /* Stop taking in new requests */
4105 spin_lock_irq(q->queue_lock);
4106 blk_stop_queue(q);
4107
4108 /* drain all requests in the queue */
4109 while (1) {
4110 /* need the lock to fetch a request
4111 * this may fetch the same reqeust as the previous pass
4112 */
4113 req = blk_fetch_request(q);
4114 /* save requests in use and starved */
4115 counts = q->rq.count[0] + q->rq.count[1] +
4116 q->rq.starved[0] + q->rq.starved[1];
4117 spin_unlock_irq(q->queue_lock);
4118 /* any requests still outstanding? */
4119 if (counts == 0)
4120 break;
4121
4122 /* This may be the same req as the previous iteration,
4123 * always send the blk_end_request_all after a prefetch.
4124 * It is not okay to not end the request because the
4125 * prefetch started the request.
4126 */
4127 if (req) {
4128 /* return -ENXIO to indicate that this queue is
4129 * going away
4130 */
4131 req->errors = -ENXIO;
4132 blk_end_request_all(req, -ENXIO);
4133 }
4134
4135 msleep(200); /* allow bsg to possibly finish */
4136 spin_lock_irq(q->queue_lock);
4137 }
4138
4139 bsg_unregister_queue(q);
4140 blk_cleanup_queue(q);
4141 }
4142 }
4143
4144
4145 /* Original Author: Martin Hicks */
4146 MODULE_AUTHOR("James Smart");
4147 MODULE_DESCRIPTION("FC Transport Attributes");
4148 MODULE_LICENSE("GPL");
4149
4150 module_init(fc_transport_init);
4151 module_exit(fc_transport_exit);
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