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block: add @force_kblockd to __blk_run_queue()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / scsi_transport_fc.c
blob5c3ccfc6b6220d99e08f21d24458e23866876392
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 = create_singlethread_workqueue(
426 fc_host->work_q_name);
427 if (!fc_host->work_q)
428 return -ENOMEM;
429
430 fc_host->dev_loss_tmo = fc_dev_loss_tmo;
431 snprintf(fc_host->devloss_work_q_name,
432 sizeof(fc_host->devloss_work_q_name),
433 "fc_dl_%d", shost->host_no);
434 fc_host->devloss_work_q = create_singlethread_workqueue(
435 fc_host->devloss_work_q_name);
436 if (!fc_host->devloss_work_q) {
437 destroy_workqueue(fc_host->work_q);
438 fc_host->work_q = NULL;
439 return -ENOMEM;
440 }
441
442 fc_bsg_hostadd(shost, fc_host);
443 /* ignore any bsg add error - we just can't do sgio */
444
445 return 0;
446 }
447
448 static int fc_host_remove(struct transport_container *tc, struct device *dev,
449 struct device *cdev)
450 {
451 struct Scsi_Host *shost = dev_to_shost(dev);
452 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
453
454 fc_bsg_remove(fc_host->rqst_q);
455 return 0;
456 }
457
458 static DECLARE_TRANSPORT_CLASS(fc_host_class,
459 "fc_host",
460 fc_host_setup,
461 fc_host_remove,
462 NULL);
463
464 /*
465 * Setup and Remove actions for remote ports are handled
466 * in the service functions below.
467 */
468 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
469 "fc_remote_ports",
470 NULL,
471 NULL,
472 NULL);
473
474 /*
475 * Setup and Remove actions for virtual ports are handled
476 * in the service functions below.
477 */
478 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
479 "fc_vports",
480 NULL,
481 NULL,
482 NULL);
483
484 /*
485 * Netlink Infrastructure
486 */
487
488 static atomic_t fc_event_seq;
489
490 /**
491 * fc_get_event_number - Obtain the next sequential FC event number
492 *
493 * Notes:
494 * We could have inlined this, but it would have required fc_event_seq to
495 * be exposed. For now, live with the subroutine call.
496 * Atomic used to avoid lock/unlock...
497 */
498 u32
499 fc_get_event_number(void)
500 {
501 return atomic_add_return(1, &fc_event_seq);
502 }
503 EXPORT_SYMBOL(fc_get_event_number);
504
505
506 /**
507 * fc_host_post_event - called to post an even on an fc_host.
508 * @shost: host the event occurred on
509 * @event_number: fc event number obtained from get_fc_event_number()
510 * @event_code: fc_host event being posted
511 * @event_data: 32bits of data for the event being posted
512 *
513 * Notes:
514 * This routine assumes no locks are held on entry.
515 */
516 void
517 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
518 enum fc_host_event_code event_code, u32 event_data)
519 {
520 struct sk_buff *skb;
521 struct nlmsghdr *nlh;
522 struct fc_nl_event *event;
523 const char *name;
524 u32 len, skblen;
525 int err;
526
527 if (!scsi_nl_sock) {
528 err = -ENOENT;
529 goto send_fail;
530 }
531
532 len = FC_NL_MSGALIGN(sizeof(*event));
533 skblen = NLMSG_SPACE(len);
534
535 skb = alloc_skb(skblen, GFP_KERNEL);
536 if (!skb) {
537 err = -ENOBUFS;
538 goto send_fail;
539 }
540
541 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
542 skblen - sizeof(*nlh), 0);
543 if (!nlh) {
544 err = -ENOBUFS;
545 goto send_fail_skb;
546 }
547 event = NLMSG_DATA(nlh);
548
549 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
550 FC_NL_ASYNC_EVENT, len);
551 event->seconds = get_seconds();
552 event->vendor_id = 0;
553 event->host_no = shost->host_no;
554 event->event_datalen = sizeof(u32); /* bytes */
555 event->event_num = event_number;
556 event->event_code = event_code;
557 event->event_data = event_data;
558
559 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
560 GFP_KERNEL);
561 return;
562
563 send_fail_skb:
564 kfree_skb(skb);
565 send_fail:
566 name = get_fc_host_event_code_name(event_code);
567 printk(KERN_WARNING
568 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
569 __func__, shost->host_no,
570 (name) ? name : "<unknown>", event_data, err);
571 return;
572 }
573 EXPORT_SYMBOL(fc_host_post_event);
574
575
576 /**
577 * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
578 * @shost: host the event occurred on
579 * @event_number: fc event number obtained from get_fc_event_number()
580 * @data_len: amount, in bytes, of vendor unique data
581 * @data_buf: pointer to vendor unique data
582 * @vendor_id: Vendor id
583 *
584 * Notes:
585 * This routine assumes no locks are held on entry.
586 */
587 void
588 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
589 u32 data_len, char * data_buf, u64 vendor_id)
590 {
591 struct sk_buff *skb;
592 struct nlmsghdr *nlh;
593 struct fc_nl_event *event;
594 u32 len, skblen;
595 int err;
596
597 if (!scsi_nl_sock) {
598 err = -ENOENT;
599 goto send_vendor_fail;
600 }
601
602 len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
603 skblen = NLMSG_SPACE(len);
604
605 skb = alloc_skb(skblen, GFP_KERNEL);
606 if (!skb) {
607 err = -ENOBUFS;
608 goto send_vendor_fail;
609 }
610
611 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
612 skblen - sizeof(*nlh), 0);
613 if (!nlh) {
614 err = -ENOBUFS;
615 goto send_vendor_fail_skb;
616 }
617 event = NLMSG_DATA(nlh);
618
619 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
620 FC_NL_ASYNC_EVENT, len);
621 event->seconds = get_seconds();
622 event->vendor_id = vendor_id;
623 event->host_no = shost->host_no;
624 event->event_datalen = data_len; /* bytes */
625 event->event_num = event_number;
626 event->event_code = FCH_EVT_VENDOR_UNIQUE;
627 memcpy(&event->event_data, data_buf, data_len);
628
629 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
630 GFP_KERNEL);
631 return;
632
633 send_vendor_fail_skb:
634 kfree_skb(skb);
635 send_vendor_fail:
636 printk(KERN_WARNING
637 "%s: Dropped Event : host %d vendor_unique - err %d\n",
638 __func__, shost->host_no, err);
639 return;
640 }
641 EXPORT_SYMBOL(fc_host_post_vendor_event);
642
643
644
645 static __init int fc_transport_init(void)
646 {
647 int error;
648
649 atomic_set(&fc_event_seq, 0);
650
651 error = transport_class_register(&fc_host_class);
652 if (error)
653 return error;
654 error = transport_class_register(&fc_vport_class);
655 if (error)
656 goto unreg_host_class;
657 error = transport_class_register(&fc_rport_class);
658 if (error)
659 goto unreg_vport_class;
660 error = transport_class_register(&fc_transport_class);
661 if (error)
662 goto unreg_rport_class;
663 return 0;
664
665 unreg_rport_class:
666 transport_class_unregister(&fc_rport_class);
667 unreg_vport_class:
668 transport_class_unregister(&fc_vport_class);
669 unreg_host_class:
670 transport_class_unregister(&fc_host_class);
671 return error;
672 }
673
674 static void __exit fc_transport_exit(void)
675 {
676 transport_class_unregister(&fc_transport_class);
677 transport_class_unregister(&fc_rport_class);
678 transport_class_unregister(&fc_host_class);
679 transport_class_unregister(&fc_vport_class);
680 }
681
682 /*
683 * FC Remote Port Attribute Management
684 */
685
686 #define fc_rport_show_function(field, format_string, sz, cast) \
687 static ssize_t \
688 show_fc_rport_##field (struct device *dev, \
689 struct device_attribute *attr, char *buf) \
690 { \
691 struct fc_rport *rport = transport_class_to_rport(dev); \
692 struct Scsi_Host *shost = rport_to_shost(rport); \
693 struct fc_internal *i = to_fc_internal(shost->transportt); \
694 if ((i->f->get_rport_##field) && \
695 !((rport->port_state == FC_PORTSTATE_BLOCKED) || \
696 (rport->port_state == FC_PORTSTATE_DELETED) || \
697 (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
698 i->f->get_rport_##field(rport); \
699 return snprintf(buf, sz, format_string, cast rport->field); \
700 }
701
702 #define fc_rport_store_function(field) \
703 static ssize_t \
704 store_fc_rport_##field(struct device *dev, \
705 struct device_attribute *attr, \
706 const char *buf, size_t count) \
707 { \
708 int val; \
709 struct fc_rport *rport = transport_class_to_rport(dev); \
710 struct Scsi_Host *shost = rport_to_shost(rport); \
711 struct fc_internal *i = to_fc_internal(shost->transportt); \
712 char *cp; \
713 if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
714 (rport->port_state == FC_PORTSTATE_DELETED) || \
715 (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
716 return -EBUSY; \
717 val = simple_strtoul(buf, &cp, 0); \
718 if (*cp && (*cp != '\n')) \
719 return -EINVAL; \
720 i->f->set_rport_##field(rport, val); \
721 return count; \
722 }
723
724 #define fc_rport_rd_attr(field, format_string, sz) \
725 fc_rport_show_function(field, format_string, sz, ) \
726 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
727 show_fc_rport_##field, NULL)
728
729 #define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
730 fc_rport_show_function(field, format_string, sz, (cast)) \
731 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
732 show_fc_rport_##field, NULL)
733
734 #define fc_rport_rw_attr(field, format_string, sz) \
735 fc_rport_show_function(field, format_string, sz, ) \
736 fc_rport_store_function(field) \
737 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
738 show_fc_rport_##field, \
739 store_fc_rport_##field)
740
741
742 #define fc_private_rport_show_function(field, format_string, sz, cast) \
743 static ssize_t \
744 show_fc_rport_##field (struct device *dev, \
745 struct device_attribute *attr, char *buf) \
746 { \
747 struct fc_rport *rport = transport_class_to_rport(dev); \
748 return snprintf(buf, sz, format_string, cast rport->field); \
749 }
750
751 #define fc_private_rport_rd_attr(field, format_string, sz) \
752 fc_private_rport_show_function(field, format_string, sz, ) \
753 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
754 show_fc_rport_##field, NULL)
755
756 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
757 fc_private_rport_show_function(field, format_string, sz, (cast)) \
758 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
759 show_fc_rport_##field, NULL)
760
761
762 #define fc_private_rport_rd_enum_attr(title, maxlen) \
763 static ssize_t \
764 show_fc_rport_##title (struct device *dev, \
765 struct device_attribute *attr, char *buf) \
766 { \
767 struct fc_rport *rport = transport_class_to_rport(dev); \
768 const char *name; \
769 name = get_fc_##title##_name(rport->title); \
770 if (!name) \
771 return -EINVAL; \
772 return snprintf(buf, maxlen, "%s\n", name); \
773 } \
774 static FC_DEVICE_ATTR(rport, title, S_IRUGO, \
775 show_fc_rport_##title, NULL)
776
777
778 #define SETUP_RPORT_ATTRIBUTE_RD(field) \
779 i->private_rport_attrs[count] = device_attr_rport_##field; \
780 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
781 i->private_rport_attrs[count].store = NULL; \
782 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
783 if (i->f->show_rport_##field) \
784 count++
785
786 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
787 i->private_rport_attrs[count] = device_attr_rport_##field; \
788 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
789 i->private_rport_attrs[count].store = NULL; \
790 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
791 count++
792
793 #define SETUP_RPORT_ATTRIBUTE_RW(field) \
794 i->private_rport_attrs[count] = device_attr_rport_##field; \
795 if (!i->f->set_rport_##field) { \
796 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
797 i->private_rport_attrs[count].store = NULL; \
798 } \
799 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
800 if (i->f->show_rport_##field) \
801 count++
802
803 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
804 { \
805 i->private_rport_attrs[count] = device_attr_rport_##field; \
806 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
807 count++; \
808 }
809
810
811 /* The FC Transport Remote Port Attributes: */
812
813 /* Fixed Remote Port Attributes */
814
815 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
816
817 static ssize_t
818 show_fc_rport_supported_classes (struct device *dev,
819 struct device_attribute *attr, char *buf)
820 {
821 struct fc_rport *rport = transport_class_to_rport(dev);
822 if (rport->supported_classes == FC_COS_UNSPECIFIED)
823 return snprintf(buf, 20, "unspecified\n");
824 return get_fc_cos_names(rport->supported_classes, buf);
825 }
826 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
827 show_fc_rport_supported_classes, NULL);
828
829 /* Dynamic Remote Port Attributes */
830
831 /*
832 * dev_loss_tmo attribute
833 */
834 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
835 {
836 char *cp;
837
838 *val = simple_strtoul(buf, &cp, 0);
839 if ((*cp && (*cp != '\n')) || (*val < 0))
840 return -EINVAL;
841 /*
842 * Check for overflow; dev_loss_tmo is u32
843 */
844 if (*val > UINT_MAX)
845 return -EINVAL;
846
847 return 0;
848 }
849
850 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
851 unsigned long val)
852 {
853 struct Scsi_Host *shost = rport_to_shost(rport);
854 struct fc_internal *i = to_fc_internal(shost->transportt);
855
856 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
857 (rport->port_state == FC_PORTSTATE_DELETED) ||
858 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
859 return -EBUSY;
860 /*
861 * Check for overflow; dev_loss_tmo is u32
862 */
863 if (val > UINT_MAX)
864 return -EINVAL;
865
866 /*
867 * If fast_io_fail is off we have to cap
868 * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
869 */
870 if (rport->fast_io_fail_tmo == -1 &&
871 val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
872 return -EINVAL;
873
874 i->f->set_rport_dev_loss_tmo(rport, val);
875 return 0;
876 }
877
878 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
879 static ssize_t
880 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
881 const char *buf, size_t count)
882 {
883 struct fc_rport *rport = transport_class_to_rport(dev);
884 unsigned long val;
885 int rc;
886
887 rc = fc_str_to_dev_loss(buf, &val);
888 if (rc)
889 return rc;
890
891 rc = fc_rport_set_dev_loss_tmo(rport, val);
892 if (rc)
893 return rc;
894 return count;
895 }
896 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
897 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
898
899
900 /* Private Remote Port Attributes */
901
902 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
903 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
904 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
905
906 static ssize_t
907 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
908 char *buf)
909 {
910 struct fc_rport *rport = transport_class_to_rport(dev);
911
912 /* identify any roles that are port_id specific */
913 if ((rport->port_id != -1) &&
914 (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
915 FC_WELLKNOWN_PORTID_MASK) {
916 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
917 case FC_FPORT_PORTID:
918 return snprintf(buf, 30, "Fabric Port\n");
919 case FC_FABCTLR_PORTID:
920 return snprintf(buf, 30, "Fabric Controller\n");
921 case FC_DIRSRVR_PORTID:
922 return snprintf(buf, 30, "Directory Server\n");
923 case FC_TIMESRVR_PORTID:
924 return snprintf(buf, 30, "Time Server\n");
925 case FC_MGMTSRVR_PORTID:
926 return snprintf(buf, 30, "Management Server\n");
927 default:
928 return snprintf(buf, 30, "Unknown Fabric Entity\n");
929 }
930 } else {
931 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
932 return snprintf(buf, 20, "unknown\n");
933 return get_fc_port_roles_names(rport->roles, buf);
934 }
935 }
936 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
937 show_fc_rport_roles, NULL);
938
939 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
940 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
941
942 /*
943 * fast_io_fail_tmo attribute
944 */
945 static ssize_t
946 show_fc_rport_fast_io_fail_tmo (struct device *dev,
947 struct device_attribute *attr, char *buf)
948 {
949 struct fc_rport *rport = transport_class_to_rport(dev);
950
951 if (rport->fast_io_fail_tmo == -1)
952 return snprintf(buf, 5, "off\n");
953 return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
954 }
955
956 static ssize_t
957 store_fc_rport_fast_io_fail_tmo(struct device *dev,
958 struct device_attribute *attr, const char *buf,
959 size_t count)
960 {
961 int val;
962 char *cp;
963 struct fc_rport *rport = transport_class_to_rport(dev);
964
965 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
966 (rport->port_state == FC_PORTSTATE_DELETED) ||
967 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
968 return -EBUSY;
969 if (strncmp(buf, "off", 3) == 0)
970 rport->fast_io_fail_tmo = -1;
971 else {
972 val = simple_strtoul(buf, &cp, 0);
973 if ((*cp && (*cp != '\n')) || (val < 0))
974 return -EINVAL;
975 /*
976 * Cap fast_io_fail by dev_loss_tmo or
977 * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
978 */
979 if ((val >= rport->dev_loss_tmo) ||
980 (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
981 return -EINVAL;
982
983 rport->fast_io_fail_tmo = val;
984 }
985 return count;
986 }
987 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
988 show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
989
990
991 /*
992 * FC SCSI Target Attribute Management
993 */
994
995 /*
996 * Note: in the target show function we recognize when the remote
997 * port is in the hierarchy and do not allow the driver to get
998 * involved in sysfs functions. The driver only gets involved if
999 * it's the "old" style that doesn't use rports.
1000 */
1001 #define fc_starget_show_function(field, format_string, sz, cast) \
1002 static ssize_t \
1003 show_fc_starget_##field (struct device *dev, \
1004 struct device_attribute *attr, char *buf) \
1005 { \
1006 struct scsi_target *starget = transport_class_to_starget(dev); \
1007 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
1008 struct fc_internal *i = to_fc_internal(shost->transportt); \
1009 struct fc_rport *rport = starget_to_rport(starget); \
1010 if (rport) \
1011 fc_starget_##field(starget) = rport->field; \
1012 else if (i->f->get_starget_##field) \
1013 i->f->get_starget_##field(starget); \
1014 return snprintf(buf, sz, format_string, \
1015 cast fc_starget_##field(starget)); \
1016 }
1017
1018 #define fc_starget_rd_attr(field, format_string, sz) \
1019 fc_starget_show_function(field, format_string, sz, ) \
1020 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1021 show_fc_starget_##field, NULL)
1022
1023 #define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
1024 fc_starget_show_function(field, format_string, sz, (cast)) \
1025 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1026 show_fc_starget_##field, NULL)
1027
1028 #define SETUP_STARGET_ATTRIBUTE_RD(field) \
1029 i->private_starget_attrs[count] = device_attr_starget_##field; \
1030 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1031 i->private_starget_attrs[count].store = NULL; \
1032 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1033 if (i->f->show_starget_##field) \
1034 count++
1035
1036 #define SETUP_STARGET_ATTRIBUTE_RW(field) \
1037 i->private_starget_attrs[count] = device_attr_starget_##field; \
1038 if (!i->f->set_starget_##field) { \
1039 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1040 i->private_starget_attrs[count].store = NULL; \
1041 } \
1042 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1043 if (i->f->show_starget_##field) \
1044 count++
1045
1046 /* The FC Transport SCSI Target Attributes: */
1047 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1048 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1049 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1050
1051
1052 /*
1053 * FC Virtual Port Attribute Management
1054 */
1055
1056 #define fc_vport_show_function(field, format_string, sz, cast) \
1057 static ssize_t \
1058 show_fc_vport_##field (struct device *dev, \
1059 struct device_attribute *attr, char *buf) \
1060 { \
1061 struct fc_vport *vport = transport_class_to_vport(dev); \
1062 struct Scsi_Host *shost = vport_to_shost(vport); \
1063 struct fc_internal *i = to_fc_internal(shost->transportt); \
1064 if ((i->f->get_vport_##field) && \
1065 !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))) \
1066 i->f->get_vport_##field(vport); \
1067 return snprintf(buf, sz, format_string, cast vport->field); \
1068 }
1069
1070 #define fc_vport_store_function(field) \
1071 static ssize_t \
1072 store_fc_vport_##field(struct device *dev, \
1073 struct device_attribute *attr, \
1074 const char *buf, size_t count) \
1075 { \
1076 int val; \
1077 struct fc_vport *vport = transport_class_to_vport(dev); \
1078 struct Scsi_Host *shost = vport_to_shost(vport); \
1079 struct fc_internal *i = to_fc_internal(shost->transportt); \
1080 char *cp; \
1081 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1082 return -EBUSY; \
1083 val = simple_strtoul(buf, &cp, 0); \
1084 if (*cp && (*cp != '\n')) \
1085 return -EINVAL; \
1086 i->f->set_vport_##field(vport, val); \
1087 return count; \
1088 }
1089
1090 #define fc_vport_store_str_function(field, slen) \
1091 static ssize_t \
1092 store_fc_vport_##field(struct device *dev, \
1093 struct device_attribute *attr, \
1094 const char *buf, size_t count) \
1095 { \
1096 struct fc_vport *vport = transport_class_to_vport(dev); \
1097 struct Scsi_Host *shost = vport_to_shost(vport); \
1098 struct fc_internal *i = to_fc_internal(shost->transportt); \
1099 unsigned int cnt=count; \
1100 \
1101 /* count may include a LF at end of string */ \
1102 if (buf[cnt-1] == '\n') \
1103 cnt--; \
1104 if (cnt > ((slen) - 1)) \
1105 return -EINVAL; \
1106 memcpy(vport->field, buf, cnt); \
1107 i->f->set_vport_##field(vport); \
1108 return count; \
1109 }
1110
1111 #define fc_vport_rd_attr(field, format_string, sz) \
1112 fc_vport_show_function(field, format_string, sz, ) \
1113 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1114 show_fc_vport_##field, NULL)
1115
1116 #define fc_vport_rd_attr_cast(field, format_string, sz, cast) \
1117 fc_vport_show_function(field, format_string, sz, (cast)) \
1118 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1119 show_fc_vport_##field, NULL)
1120
1121 #define fc_vport_rw_attr(field, format_string, sz) \
1122 fc_vport_show_function(field, format_string, sz, ) \
1123 fc_vport_store_function(field) \
1124 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1125 show_fc_vport_##field, \
1126 store_fc_vport_##field)
1127
1128 #define fc_private_vport_show_function(field, format_string, sz, cast) \
1129 static ssize_t \
1130 show_fc_vport_##field (struct device *dev, \
1131 struct device_attribute *attr, char *buf) \
1132 { \
1133 struct fc_vport *vport = transport_class_to_vport(dev); \
1134 return snprintf(buf, sz, format_string, cast vport->field); \
1135 }
1136
1137 #define fc_private_vport_store_u32_function(field) \
1138 static ssize_t \
1139 store_fc_vport_##field(struct device *dev, \
1140 struct device_attribute *attr, \
1141 const char *buf, size_t count) \
1142 { \
1143 u32 val; \
1144 struct fc_vport *vport = transport_class_to_vport(dev); \
1145 char *cp; \
1146 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1147 return -EBUSY; \
1148 val = simple_strtoul(buf, &cp, 0); \
1149 if (*cp && (*cp != '\n')) \
1150 return -EINVAL; \
1151 vport->field = val; \
1152 return count; \
1153 }
1154
1155
1156 #define fc_private_vport_rd_attr(field, format_string, sz) \
1157 fc_private_vport_show_function(field, format_string, sz, ) \
1158 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1159 show_fc_vport_##field, NULL)
1160
1161 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast) \
1162 fc_private_vport_show_function(field, format_string, sz, (cast)) \
1163 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1164 show_fc_vport_##field, NULL)
1165
1166 #define fc_private_vport_rw_u32_attr(field, format_string, sz) \
1167 fc_private_vport_show_function(field, format_string, sz, ) \
1168 fc_private_vport_store_u32_function(field) \
1169 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1170 show_fc_vport_##field, \
1171 store_fc_vport_##field)
1172
1173
1174 #define fc_private_vport_rd_enum_attr(title, maxlen) \
1175 static ssize_t \
1176 show_fc_vport_##title (struct device *dev, \
1177 struct device_attribute *attr, \
1178 char *buf) \
1179 { \
1180 struct fc_vport *vport = transport_class_to_vport(dev); \
1181 const char *name; \
1182 name = get_fc_##title##_name(vport->title); \
1183 if (!name) \
1184 return -EINVAL; \
1185 return snprintf(buf, maxlen, "%s\n", name); \
1186 } \
1187 static FC_DEVICE_ATTR(vport, title, S_IRUGO, \
1188 show_fc_vport_##title, NULL)
1189
1190
1191 #define SETUP_VPORT_ATTRIBUTE_RD(field) \
1192 i->private_vport_attrs[count] = device_attr_vport_##field; \
1193 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1194 i->private_vport_attrs[count].store = NULL; \
1195 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1196 if (i->f->get_##field) \
1197 count++
1198 /* NOTE: Above MACRO differs: checks function not show bit */
1199
1200 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field) \
1201 i->private_vport_attrs[count] = device_attr_vport_##field; \
1202 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1203 i->private_vport_attrs[count].store = NULL; \
1204 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1205 count++
1206
1207 #define SETUP_VPORT_ATTRIBUTE_WR(field) \
1208 i->private_vport_attrs[count] = device_attr_vport_##field; \
1209 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1210 if (i->f->field) \
1211 count++
1212 /* NOTE: Above MACRO differs: checks function */
1213
1214 #define SETUP_VPORT_ATTRIBUTE_RW(field) \
1215 i->private_vport_attrs[count] = device_attr_vport_##field; \
1216 if (!i->f->set_vport_##field) { \
1217 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1218 i->private_vport_attrs[count].store = NULL; \
1219 } \
1220 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1221 count++
1222 /* NOTE: Above MACRO differs: does not check show bit */
1223
1224 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field) \
1225 { \
1226 i->private_vport_attrs[count] = device_attr_vport_##field; \
1227 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1228 count++; \
1229 }
1230
1231
1232 /* The FC Transport Virtual Port Attributes: */
1233
1234 /* Fixed Virtual Port Attributes */
1235
1236 /* Dynamic Virtual Port Attributes */
1237
1238 /* Private Virtual Port Attributes */
1239
1240 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1241 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1242 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1243 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1244
1245 static ssize_t
1246 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1247 char *buf)
1248 {
1249 struct fc_vport *vport = transport_class_to_vport(dev);
1250
1251 if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1252 return snprintf(buf, 20, "unknown\n");
1253 return get_fc_port_roles_names(vport->roles, buf);
1254 }
1255 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1256
1257 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1258
1259 fc_private_vport_show_function(symbolic_name, "%s\n",
1260 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1261 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1262 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1263 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1264
1265 static ssize_t
1266 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1267 const char *buf, size_t count)
1268 {
1269 struct fc_vport *vport = transport_class_to_vport(dev);
1270 struct Scsi_Host *shost = vport_to_shost(vport);
1271 unsigned long flags;
1272
1273 spin_lock_irqsave(shost->host_lock, flags);
1274 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1275 spin_unlock_irqrestore(shost->host_lock, flags);
1276 return -EBUSY;
1277 }
1278 vport->flags |= FC_VPORT_DELETING;
1279 spin_unlock_irqrestore(shost->host_lock, flags);
1280
1281 fc_queue_work(shost, &vport->vport_delete_work);
1282 return count;
1283 }
1284 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1285 NULL, store_fc_vport_delete);
1286
1287
1288 /*
1289 * Enable/Disable vport
1290 * Write "1" to disable, write "0" to enable
1291 */
1292 static ssize_t
1293 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1294 const char *buf,
1295 size_t count)
1296 {
1297 struct fc_vport *vport = transport_class_to_vport(dev);
1298 struct Scsi_Host *shost = vport_to_shost(vport);
1299 struct fc_internal *i = to_fc_internal(shost->transportt);
1300 int stat;
1301
1302 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1303 return -EBUSY;
1304
1305 if (*buf == '0') {
1306 if (vport->vport_state != FC_VPORT_DISABLED)
1307 return -EALREADY;
1308 } else if (*buf == '1') {
1309 if (vport->vport_state == FC_VPORT_DISABLED)
1310 return -EALREADY;
1311 } else
1312 return -EINVAL;
1313
1314 stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1315 return stat ? stat : count;
1316 }
1317 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1318 NULL, store_fc_vport_disable);
1319
1320
1321 /*
1322 * Host Attribute Management
1323 */
1324
1325 #define fc_host_show_function(field, format_string, sz, cast) \
1326 static ssize_t \
1327 show_fc_host_##field (struct device *dev, \
1328 struct device_attribute *attr, char *buf) \
1329 { \
1330 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1331 struct fc_internal *i = to_fc_internal(shost->transportt); \
1332 if (i->f->get_host_##field) \
1333 i->f->get_host_##field(shost); \
1334 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1335 }
1336
1337 #define fc_host_store_function(field) \
1338 static ssize_t \
1339 store_fc_host_##field(struct device *dev, \
1340 struct device_attribute *attr, \
1341 const char *buf, size_t count) \
1342 { \
1343 int val; \
1344 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1345 struct fc_internal *i = to_fc_internal(shost->transportt); \
1346 char *cp; \
1347 \
1348 val = simple_strtoul(buf, &cp, 0); \
1349 if (*cp && (*cp != '\n')) \
1350 return -EINVAL; \
1351 i->f->set_host_##field(shost, val); \
1352 return count; \
1353 }
1354
1355 #define fc_host_store_str_function(field, slen) \
1356 static ssize_t \
1357 store_fc_host_##field(struct device *dev, \
1358 struct device_attribute *attr, \
1359 const char *buf, size_t count) \
1360 { \
1361 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1362 struct fc_internal *i = to_fc_internal(shost->transportt); \
1363 unsigned int cnt=count; \
1364 \
1365 /* count may include a LF at end of string */ \
1366 if (buf[cnt-1] == '\n') \
1367 cnt--; \
1368 if (cnt > ((slen) - 1)) \
1369 return -EINVAL; \
1370 memcpy(fc_host_##field(shost), buf, cnt); \
1371 i->f->set_host_##field(shost); \
1372 return count; \
1373 }
1374
1375 #define fc_host_rd_attr(field, format_string, sz) \
1376 fc_host_show_function(field, format_string, sz, ) \
1377 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1378 show_fc_host_##field, NULL)
1379
1380 #define fc_host_rd_attr_cast(field, format_string, sz, cast) \
1381 fc_host_show_function(field, format_string, sz, (cast)) \
1382 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1383 show_fc_host_##field, NULL)
1384
1385 #define fc_host_rw_attr(field, format_string, sz) \
1386 fc_host_show_function(field, format_string, sz, ) \
1387 fc_host_store_function(field) \
1388 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
1389 show_fc_host_##field, \
1390 store_fc_host_##field)
1391
1392 #define fc_host_rd_enum_attr(title, maxlen) \
1393 static ssize_t \
1394 show_fc_host_##title (struct device *dev, \
1395 struct device_attribute *attr, char *buf) \
1396 { \
1397 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1398 struct fc_internal *i = to_fc_internal(shost->transportt); \
1399 const char *name; \
1400 if (i->f->get_host_##title) \
1401 i->f->get_host_##title(shost); \
1402 name = get_fc_##title##_name(fc_host_##title(shost)); \
1403 if (!name) \
1404 return -EINVAL; \
1405 return snprintf(buf, maxlen, "%s\n", name); \
1406 } \
1407 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1408
1409 #define SETUP_HOST_ATTRIBUTE_RD(field) \
1410 i->private_host_attrs[count] = device_attr_host_##field; \
1411 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1412 i->private_host_attrs[count].store = NULL; \
1413 i->host_attrs[count] = &i->private_host_attrs[count]; \
1414 if (i->f->show_host_##field) \
1415 count++
1416
1417 #define SETUP_HOST_ATTRIBUTE_RD_NS(field) \
1418 i->private_host_attrs[count] = device_attr_host_##field; \
1419 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1420 i->private_host_attrs[count].store = NULL; \
1421 i->host_attrs[count] = &i->private_host_attrs[count]; \
1422 count++
1423
1424 #define SETUP_HOST_ATTRIBUTE_RW(field) \
1425 i->private_host_attrs[count] = device_attr_host_##field; \
1426 if (!i->f->set_host_##field) { \
1427 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1428 i->private_host_attrs[count].store = NULL; \
1429 } \
1430 i->host_attrs[count] = &i->private_host_attrs[count]; \
1431 if (i->f->show_host_##field) \
1432 count++
1433
1434
1435 #define fc_private_host_show_function(field, format_string, sz, cast) \
1436 static ssize_t \
1437 show_fc_host_##field (struct device *dev, \
1438 struct device_attribute *attr, char *buf) \
1439 { \
1440 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1441 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1442 }
1443
1444 #define fc_private_host_rd_attr(field, format_string, sz) \
1445 fc_private_host_show_function(field, format_string, sz, ) \
1446 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1447 show_fc_host_##field, NULL)
1448
1449 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
1450 fc_private_host_show_function(field, format_string, sz, (cast)) \
1451 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1452 show_fc_host_##field, NULL)
1453
1454 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
1455 i->private_host_attrs[count] = device_attr_host_##field; \
1456 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1457 i->private_host_attrs[count].store = NULL; \
1458 i->host_attrs[count] = &i->private_host_attrs[count]; \
1459 count++
1460
1461 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
1462 { \
1463 i->private_host_attrs[count] = device_attr_host_##field; \
1464 i->host_attrs[count] = &i->private_host_attrs[count]; \
1465 count++; \
1466 }
1467
1468
1469 /* Fixed Host Attributes */
1470
1471 static ssize_t
1472 show_fc_host_supported_classes (struct device *dev,
1473 struct device_attribute *attr, char *buf)
1474 {
1475 struct Scsi_Host *shost = transport_class_to_shost(dev);
1476
1477 if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1478 return snprintf(buf, 20, "unspecified\n");
1479
1480 return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1481 }
1482 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1483 show_fc_host_supported_classes, NULL);
1484
1485 static ssize_t
1486 show_fc_host_supported_fc4s (struct device *dev,
1487 struct device_attribute *attr, char *buf)
1488 {
1489 struct Scsi_Host *shost = transport_class_to_shost(dev);
1490 return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1491 }
1492 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1493 show_fc_host_supported_fc4s, NULL);
1494
1495 static ssize_t
1496 show_fc_host_supported_speeds (struct device *dev,
1497 struct device_attribute *attr, char *buf)
1498 {
1499 struct Scsi_Host *shost = transport_class_to_shost(dev);
1500
1501 if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1502 return snprintf(buf, 20, "unknown\n");
1503
1504 return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1505 }
1506 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1507 show_fc_host_supported_speeds, NULL);
1508
1509
1510 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1511 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1512 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1513 unsigned long long);
1514 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1515 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1516 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1517
1518
1519 /* Dynamic Host Attributes */
1520
1521 static ssize_t
1522 show_fc_host_active_fc4s (struct device *dev,
1523 struct device_attribute *attr, char *buf)
1524 {
1525 struct Scsi_Host *shost = transport_class_to_shost(dev);
1526 struct fc_internal *i = to_fc_internal(shost->transportt);
1527
1528 if (i->f->get_host_active_fc4s)
1529 i->f->get_host_active_fc4s(shost);
1530
1531 return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1532 }
1533 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1534 show_fc_host_active_fc4s, NULL);
1535
1536 static ssize_t
1537 show_fc_host_speed (struct device *dev,
1538 struct device_attribute *attr, char *buf)
1539 {
1540 struct Scsi_Host *shost = transport_class_to_shost(dev);
1541 struct fc_internal *i = to_fc_internal(shost->transportt);
1542
1543 if (i->f->get_host_speed)
1544 i->f->get_host_speed(shost);
1545
1546 if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1547 return snprintf(buf, 20, "unknown\n");
1548
1549 return get_fc_port_speed_names(fc_host_speed(shost), buf);
1550 }
1551 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1552 show_fc_host_speed, NULL);
1553
1554
1555 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1556 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1557 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1558 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1559 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1560
1561 fc_private_host_show_function(system_hostname, "%s\n",
1562 FC_SYMBOLIC_NAME_SIZE + 1, )
1563 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1564 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1565 show_fc_host_system_hostname, store_fc_host_system_hostname);
1566
1567
1568 /* Private Host Attributes */
1569
1570 static ssize_t
1571 show_fc_private_host_tgtid_bind_type(struct device *dev,
1572 struct device_attribute *attr, char *buf)
1573 {
1574 struct Scsi_Host *shost = transport_class_to_shost(dev);
1575 const char *name;
1576
1577 name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1578 if (!name)
1579 return -EINVAL;
1580 return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1581 }
1582
1583 #define get_list_head_entry(pos, head, member) \
1584 pos = list_entry((head)->next, typeof(*pos), member)
1585
1586 static ssize_t
1587 store_fc_private_host_tgtid_bind_type(struct device *dev,
1588 struct device_attribute *attr, const char *buf, size_t count)
1589 {
1590 struct Scsi_Host *shost = transport_class_to_shost(dev);
1591 struct fc_rport *rport;
1592 enum fc_tgtid_binding_type val;
1593 unsigned long flags;
1594
1595 if (get_fc_tgtid_bind_type_match(buf, &val))
1596 return -EINVAL;
1597
1598 /* if changing bind type, purge all unused consistent bindings */
1599 if (val != fc_host_tgtid_bind_type(shost)) {
1600 spin_lock_irqsave(shost->host_lock, flags);
1601 while (!list_empty(&fc_host_rport_bindings(shost))) {
1602 get_list_head_entry(rport,
1603 &fc_host_rport_bindings(shost), peers);
1604 list_del(&rport->peers);
1605 rport->port_state = FC_PORTSTATE_DELETED;
1606 fc_queue_work(shost, &rport->rport_delete_work);
1607 }
1608 spin_unlock_irqrestore(shost->host_lock, flags);
1609 }
1610
1611 fc_host_tgtid_bind_type(shost) = val;
1612 return count;
1613 }
1614
1615 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1616 show_fc_private_host_tgtid_bind_type,
1617 store_fc_private_host_tgtid_bind_type);
1618
1619 static ssize_t
1620 store_fc_private_host_issue_lip(struct device *dev,
1621 struct device_attribute *attr, const char *buf, size_t count)
1622 {
1623 struct Scsi_Host *shost = transport_class_to_shost(dev);
1624 struct fc_internal *i = to_fc_internal(shost->transportt);
1625 int ret;
1626
1627 /* ignore any data value written to the attribute */
1628 if (i->f->issue_fc_host_lip) {
1629 ret = i->f->issue_fc_host_lip(shost);
1630 return ret ? ret: count;
1631 }
1632
1633 return -ENOENT;
1634 }
1635
1636 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1637 store_fc_private_host_issue_lip);
1638
1639 static ssize_t
1640 store_fc_private_host_dev_loss_tmo(struct device *dev,
1641 struct device_attribute *attr,
1642 const char *buf, size_t count)
1643 {
1644 struct Scsi_Host *shost = transport_class_to_shost(dev);
1645 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1646 struct fc_rport *rport;
1647 unsigned long val, flags;
1648 int rc;
1649
1650 rc = fc_str_to_dev_loss(buf, &val);
1651 if (rc)
1652 return rc;
1653
1654 fc_host_dev_loss_tmo(shost) = val;
1655 spin_lock_irqsave(shost->host_lock, flags);
1656 list_for_each_entry(rport, &fc_host->rports, peers)
1657 fc_rport_set_dev_loss_tmo(rport, val);
1658 spin_unlock_irqrestore(shost->host_lock, flags);
1659 return count;
1660 }
1661
1662 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
1663 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
1664 show_fc_host_dev_loss_tmo,
1665 store_fc_private_host_dev_loss_tmo);
1666
1667 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1668
1669 /*
1670 * Host Statistics Management
1671 */
1672
1673 /* Show a given an attribute in the statistics group */
1674 static ssize_t
1675 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1676 {
1677 struct Scsi_Host *shost = transport_class_to_shost(dev);
1678 struct fc_internal *i = to_fc_internal(shost->transportt);
1679 struct fc_host_statistics *stats;
1680 ssize_t ret = -ENOENT;
1681
1682 if (offset > sizeof(struct fc_host_statistics) ||
1683 offset % sizeof(u64) != 0)
1684 WARN_ON(1);
1685
1686 if (i->f->get_fc_host_stats) {
1687 stats = (i->f->get_fc_host_stats)(shost);
1688 if (stats)
1689 ret = snprintf(buf, 20, "0x%llx\n",
1690 (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1691 }
1692 return ret;
1693 }
1694
1695
1696 /* generate a read-only statistics attribute */
1697 #define fc_host_statistic(name) \
1698 static ssize_t show_fcstat_##name(struct device *cd, \
1699 struct device_attribute *attr, \
1700 char *buf) \
1701 { \
1702 return fc_stat_show(cd, buf, \
1703 offsetof(struct fc_host_statistics, name)); \
1704 } \
1705 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1706
1707 fc_host_statistic(seconds_since_last_reset);
1708 fc_host_statistic(tx_frames);
1709 fc_host_statistic(tx_words);
1710 fc_host_statistic(rx_frames);
1711 fc_host_statistic(rx_words);
1712 fc_host_statistic(lip_count);
1713 fc_host_statistic(nos_count);
1714 fc_host_statistic(error_frames);
1715 fc_host_statistic(dumped_frames);
1716 fc_host_statistic(link_failure_count);
1717 fc_host_statistic(loss_of_sync_count);
1718 fc_host_statistic(loss_of_signal_count);
1719 fc_host_statistic(prim_seq_protocol_err_count);
1720 fc_host_statistic(invalid_tx_word_count);
1721 fc_host_statistic(invalid_crc_count);
1722 fc_host_statistic(fcp_input_requests);
1723 fc_host_statistic(fcp_output_requests);
1724 fc_host_statistic(fcp_control_requests);
1725 fc_host_statistic(fcp_input_megabytes);
1726 fc_host_statistic(fcp_output_megabytes);
1727
1728 static ssize_t
1729 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1730 const char *buf, size_t count)
1731 {
1732 struct Scsi_Host *shost = transport_class_to_shost(dev);
1733 struct fc_internal *i = to_fc_internal(shost->transportt);
1734
1735 /* ignore any data value written to the attribute */
1736 if (i->f->reset_fc_host_stats) {
1737 i->f->reset_fc_host_stats(shost);
1738 return count;
1739 }
1740
1741 return -ENOENT;
1742 }
1743 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1744 fc_reset_statistics);
1745
1746 static struct attribute *fc_statistics_attrs[] = {
1747 &device_attr_host_seconds_since_last_reset.attr,
1748 &device_attr_host_tx_frames.attr,
1749 &device_attr_host_tx_words.attr,
1750 &device_attr_host_rx_frames.attr,
1751 &device_attr_host_rx_words.attr,
1752 &device_attr_host_lip_count.attr,
1753 &device_attr_host_nos_count.attr,
1754 &device_attr_host_error_frames.attr,
1755 &device_attr_host_dumped_frames.attr,
1756 &device_attr_host_link_failure_count.attr,
1757 &device_attr_host_loss_of_sync_count.attr,
1758 &device_attr_host_loss_of_signal_count.attr,
1759 &device_attr_host_prim_seq_protocol_err_count.attr,
1760 &device_attr_host_invalid_tx_word_count.attr,
1761 &device_attr_host_invalid_crc_count.attr,
1762 &device_attr_host_fcp_input_requests.attr,
1763 &device_attr_host_fcp_output_requests.attr,
1764 &device_attr_host_fcp_control_requests.attr,
1765 &device_attr_host_fcp_input_megabytes.attr,
1766 &device_attr_host_fcp_output_megabytes.attr,
1767 &device_attr_host_reset_statistics.attr,
1768 NULL
1769 };
1770
1771 static struct attribute_group fc_statistics_group = {
1772 .name = "statistics",
1773 .attrs = fc_statistics_attrs,
1774 };
1775
1776
1777 /* Host Vport Attributes */
1778
1779 static int
1780 fc_parse_wwn(const char *ns, u64 *nm)
1781 {
1782 unsigned int i, j;
1783 u8 wwn[8];
1784
1785 memset(wwn, 0, sizeof(wwn));
1786
1787 /* Validate and store the new name */
1788 for (i=0, j=0; i < 16; i++) {
1789 int value;
1790
1791 value = hex_to_bin(*ns++);
1792 if (value >= 0)
1793 j = (j << 4) | value;
1794 else
1795 return -EINVAL;
1796 if (i % 2) {
1797 wwn[i/2] = j & 0xff;
1798 j = 0;
1799 }
1800 }
1801
1802 *nm = wwn_to_u64(wwn);
1803
1804 return 0;
1805 }
1806
1807
1808 /*
1809 * "Short-cut" sysfs variable to create a new vport on a FC Host.
1810 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1811 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1812 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1813 */
1814 static ssize_t
1815 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1816 const char *buf, size_t count)
1817 {
1818 struct Scsi_Host *shost = transport_class_to_shost(dev);
1819 struct fc_vport_identifiers vid;
1820 struct fc_vport *vport;
1821 unsigned int cnt=count;
1822 int stat;
1823
1824 memset(&vid, 0, sizeof(vid));
1825
1826 /* count may include a LF at end of string */
1827 if (buf[cnt-1] == '\n')
1828 cnt--;
1829
1830 /* validate we have enough characters for WWPN */
1831 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1832 return -EINVAL;
1833
1834 stat = fc_parse_wwn(&buf[0], &vid.port_name);
1835 if (stat)
1836 return stat;
1837
1838 stat = fc_parse_wwn(&buf[17], &vid.node_name);
1839 if (stat)
1840 return stat;
1841
1842 vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1843 vid.vport_type = FC_PORTTYPE_NPIV;
1844 /* vid.symbolic_name is already zero/NULL's */
1845 vid.disable = false; /* always enabled */
1846
1847 /* we only allow support on Channel 0 !!! */
1848 stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1849 return stat ? stat : count;
1850 }
1851 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1852 store_fc_host_vport_create);
1853
1854
1855 /*
1856 * "Short-cut" sysfs variable to delete a vport on a FC Host.
1857 * Vport is identified by a string containing "<WWPN>:<WWNN>".
1858 * The WWNs are specified as hex characters, and may *not* contain
1859 * any prefixes (e.g. 0x, x, etc)
1860 */
1861 static ssize_t
1862 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1863 const char *buf, size_t count)
1864 {
1865 struct Scsi_Host *shost = transport_class_to_shost(dev);
1866 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1867 struct fc_vport *vport;
1868 u64 wwpn, wwnn;
1869 unsigned long flags;
1870 unsigned int cnt=count;
1871 int stat, match;
1872
1873 /* count may include a LF at end of string */
1874 if (buf[cnt-1] == '\n')
1875 cnt--;
1876
1877 /* validate we have enough characters for WWPN */
1878 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1879 return -EINVAL;
1880
1881 stat = fc_parse_wwn(&buf[0], &wwpn);
1882 if (stat)
1883 return stat;
1884
1885 stat = fc_parse_wwn(&buf[17], &wwnn);
1886 if (stat)
1887 return stat;
1888
1889 spin_lock_irqsave(shost->host_lock, flags);
1890 match = 0;
1891 /* we only allow support on Channel 0 !!! */
1892 list_for_each_entry(vport, &fc_host->vports, peers) {
1893 if ((vport->channel == 0) &&
1894 (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1895 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1896 break;
1897 vport->flags |= FC_VPORT_DELETING;
1898 match = 1;
1899 break;
1900 }
1901 }
1902 spin_unlock_irqrestore(shost->host_lock, flags);
1903
1904 if (!match)
1905 return -ENODEV;
1906
1907 stat = fc_vport_terminate(vport);
1908 return stat ? stat : count;
1909 }
1910 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1911 store_fc_host_vport_delete);
1912
1913
1914 static int fc_host_match(struct attribute_container *cont,
1915 struct device *dev)
1916 {
1917 struct Scsi_Host *shost;
1918 struct fc_internal *i;
1919
1920 if (!scsi_is_host_device(dev))
1921 return 0;
1922
1923 shost = dev_to_shost(dev);
1924 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1925 != &fc_host_class.class)
1926 return 0;
1927
1928 i = to_fc_internal(shost->transportt);
1929
1930 return &i->t.host_attrs.ac == cont;
1931 }
1932
1933 static int fc_target_match(struct attribute_container *cont,
1934 struct device *dev)
1935 {
1936 struct Scsi_Host *shost;
1937 struct fc_internal *i;
1938
1939 if (!scsi_is_target_device(dev))
1940 return 0;
1941
1942 shost = dev_to_shost(dev->parent);
1943 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1944 != &fc_host_class.class)
1945 return 0;
1946
1947 i = to_fc_internal(shost->transportt);
1948
1949 return &i->t.target_attrs.ac == cont;
1950 }
1951
1952 static void fc_rport_dev_release(struct device *dev)
1953 {
1954 struct fc_rport *rport = dev_to_rport(dev);
1955 put_device(dev->parent);
1956 kfree(rport);
1957 }
1958
1959 int scsi_is_fc_rport(const struct device *dev)
1960 {
1961 return dev->release == fc_rport_dev_release;
1962 }
1963 EXPORT_SYMBOL(scsi_is_fc_rport);
1964
1965 static int fc_rport_match(struct attribute_container *cont,
1966 struct device *dev)
1967 {
1968 struct Scsi_Host *shost;
1969 struct fc_internal *i;
1970
1971 if (!scsi_is_fc_rport(dev))
1972 return 0;
1973
1974 shost = dev_to_shost(dev->parent);
1975 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1976 != &fc_host_class.class)
1977 return 0;
1978
1979 i = to_fc_internal(shost->transportt);
1980
1981 return &i->rport_attr_cont.ac == cont;
1982 }
1983
1984
1985 static void fc_vport_dev_release(struct device *dev)
1986 {
1987 struct fc_vport *vport = dev_to_vport(dev);
1988 put_device(dev->parent); /* release kobj parent */
1989 kfree(vport);
1990 }
1991
1992 int scsi_is_fc_vport(const struct device *dev)
1993 {
1994 return dev->release == fc_vport_dev_release;
1995 }
1996 EXPORT_SYMBOL(scsi_is_fc_vport);
1997
1998 static int fc_vport_match(struct attribute_container *cont,
1999 struct device *dev)
2000 {
2001 struct fc_vport *vport;
2002 struct Scsi_Host *shost;
2003 struct fc_internal *i;
2004
2005 if (!scsi_is_fc_vport(dev))
2006 return 0;
2007 vport = dev_to_vport(dev);
2008
2009 shost = vport_to_shost(vport);
2010 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2011 != &fc_host_class.class)
2012 return 0;
2013
2014 i = to_fc_internal(shost->transportt);
2015 return &i->vport_attr_cont.ac == cont;
2016 }
2017
2018
2019 /**
2020 * fc_timed_out - FC Transport I/O timeout intercept handler
2021 * @scmd: The SCSI command which timed out
2022 *
2023 * This routine protects against error handlers getting invoked while a
2024 * rport is in a blocked state, typically due to a temporarily loss of
2025 * connectivity. If the error handlers are allowed to proceed, requests
2026 * to abort i/o, reset the target, etc will likely fail as there is no way
2027 * to communicate with the device to perform the requested function. These
2028 * failures may result in the midlayer taking the device offline, requiring
2029 * manual intervention to restore operation.
2030 *
2031 * This routine, called whenever an i/o times out, validates the state of
2032 * the underlying rport. If the rport is blocked, it returns
2033 * EH_RESET_TIMER, which will continue to reschedule the timeout.
2034 * Eventually, either the device will return, or devloss_tmo will fire,
2035 * and when the timeout then fires, it will be handled normally.
2036 * If the rport is not blocked, normal error handling continues.
2037 *
2038 * Notes:
2039 * This routine assumes no locks are held on entry.
2040 */
2041 static enum blk_eh_timer_return
2042 fc_timed_out(struct scsi_cmnd *scmd)
2043 {
2044 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2045
2046 if (rport->port_state == FC_PORTSTATE_BLOCKED)
2047 return BLK_EH_RESET_TIMER;
2048
2049 return BLK_EH_NOT_HANDLED;
2050 }
2051
2052 /*
2053 * Called by fc_user_scan to locate an rport on the shost that
2054 * matches the channel and target id, and invoke scsi_scan_target()
2055 * on the rport.
2056 */
2057 static void
2058 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2059 {
2060 struct fc_rport *rport;
2061 unsigned long flags;
2062
2063 spin_lock_irqsave(shost->host_lock, flags);
2064
2065 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2066 if (rport->scsi_target_id == -1)
2067 continue;
2068
2069 if (rport->port_state != FC_PORTSTATE_ONLINE)
2070 continue;
2071
2072 if ((channel == rport->channel) &&
2073 (id == rport->scsi_target_id)) {
2074 spin_unlock_irqrestore(shost->host_lock, flags);
2075 scsi_scan_target(&rport->dev, channel, id, lun, 1);
2076 return;
2077 }
2078 }
2079
2080 spin_unlock_irqrestore(shost->host_lock, flags);
2081 }
2082
2083 /*
2084 * Called via sysfs scan routines. Necessary, as the FC transport
2085 * wants to place all target objects below the rport object. So this
2086 * routine must invoke the scsi_scan_target() routine with the rport
2087 * object as the parent.
2088 */
2089 static int
2090 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2091 {
2092 uint chlo, chhi;
2093 uint tgtlo, tgthi;
2094
2095 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2096 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2097 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2098 return -EINVAL;
2099
2100 if (channel == SCAN_WILD_CARD) {
2101 chlo = 0;
2102 chhi = shost->max_channel + 1;
2103 } else {
2104 chlo = channel;
2105 chhi = channel + 1;
2106 }
2107
2108 if (id == SCAN_WILD_CARD) {
2109 tgtlo = 0;
2110 tgthi = shost->max_id;
2111 } else {
2112 tgtlo = id;
2113 tgthi = id + 1;
2114 }
2115
2116 for ( ; chlo < chhi; chlo++)
2117 for ( ; tgtlo < tgthi; tgtlo++)
2118 fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2119
2120 return 0;
2121 }
2122
2123 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2124 int result)
2125 {
2126 struct fc_internal *i = to_fc_internal(shost->transportt);
2127 return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2128 }
2129
2130 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2131 {
2132 struct fc_internal *i = to_fc_internal(shost->transportt);
2133 return i->f->it_nexus_response(shost, nexus, result);
2134 }
2135
2136 struct scsi_transport_template *
2137 fc_attach_transport(struct fc_function_template *ft)
2138 {
2139 int count;
2140 struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2141 GFP_KERNEL);
2142
2143 if (unlikely(!i))
2144 return NULL;
2145
2146 i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2147 i->t.target_attrs.ac.class = &fc_transport_class.class;
2148 i->t.target_attrs.ac.match = fc_target_match;
2149 i->t.target_size = sizeof(struct fc_starget_attrs);
2150 transport_container_register(&i->t.target_attrs);
2151
2152 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2153 i->t.host_attrs.ac.class = &fc_host_class.class;
2154 i->t.host_attrs.ac.match = fc_host_match;
2155 i->t.host_size = sizeof(struct fc_host_attrs);
2156 if (ft->get_fc_host_stats)
2157 i->t.host_attrs.statistics = &fc_statistics_group;
2158 transport_container_register(&i->t.host_attrs);
2159
2160 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2161 i->rport_attr_cont.ac.class = &fc_rport_class.class;
2162 i->rport_attr_cont.ac.match = fc_rport_match;
2163 transport_container_register(&i->rport_attr_cont);
2164
2165 i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2166 i->vport_attr_cont.ac.class = &fc_vport_class.class;
2167 i->vport_attr_cont.ac.match = fc_vport_match;
2168 transport_container_register(&i->vport_attr_cont);
2169
2170 i->f = ft;
2171
2172 /* Transport uses the shost workq for scsi scanning */
2173 i->t.create_work_queue = 1;
2174
2175 i->t.eh_timed_out = fc_timed_out;
2176
2177 i->t.user_scan = fc_user_scan;
2178
2179 /* target-mode drivers' functions */
2180 i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2181 i->t.it_nexus_response = fc_it_nexus_response;
2182
2183 /*
2184 * Setup SCSI Target Attributes.
2185 */
2186 count = 0;
2187 SETUP_STARGET_ATTRIBUTE_RD(node_name);
2188 SETUP_STARGET_ATTRIBUTE_RD(port_name);
2189 SETUP_STARGET_ATTRIBUTE_RD(port_id);
2190
2191 BUG_ON(count > FC_STARGET_NUM_ATTRS);
2192
2193 i->starget_attrs[count] = NULL;
2194
2195
2196 /*
2197 * Setup SCSI Host Attributes.
2198 */
2199 count=0;
2200 SETUP_HOST_ATTRIBUTE_RD(node_name);
2201 SETUP_HOST_ATTRIBUTE_RD(port_name);
2202 SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2203 SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2204 SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2205 SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2206 SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2207 if (ft->vport_create) {
2208 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2209 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2210 }
2211 SETUP_HOST_ATTRIBUTE_RD(serial_number);
2212
2213 SETUP_HOST_ATTRIBUTE_RD(port_id);
2214 SETUP_HOST_ATTRIBUTE_RD(port_type);
2215 SETUP_HOST_ATTRIBUTE_RD(port_state);
2216 SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2217 SETUP_HOST_ATTRIBUTE_RD(speed);
2218 SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2219 SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2220 SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2221
2222 /* Transport-managed attributes */
2223 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2224 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2225 if (ft->issue_fc_host_lip)
2226 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2227 if (ft->vport_create)
2228 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2229 if (ft->vport_delete)
2230 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2231
2232 BUG_ON(count > FC_HOST_NUM_ATTRS);
2233
2234 i->host_attrs[count] = NULL;
2235
2236 /*
2237 * Setup Remote Port Attributes.
2238 */
2239 count=0;
2240 SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2241 SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2242 SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2243 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2244 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2245 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2246 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2247 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2248 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2249 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2250
2251 BUG_ON(count > FC_RPORT_NUM_ATTRS);
2252
2253 i->rport_attrs[count] = NULL;
2254
2255 /*
2256 * Setup Virtual Port Attributes.
2257 */
2258 count=0;
2259 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2260 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2261 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2262 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2263 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2264 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2265 SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2266 SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2267 SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2268
2269 BUG_ON(count > FC_VPORT_NUM_ATTRS);
2270
2271 i->vport_attrs[count] = NULL;
2272
2273 return &i->t;
2274 }
2275 EXPORT_SYMBOL(fc_attach_transport);
2276
2277 void fc_release_transport(struct scsi_transport_template *t)
2278 {
2279 struct fc_internal *i = to_fc_internal(t);
2280
2281 transport_container_unregister(&i->t.target_attrs);
2282 transport_container_unregister(&i->t.host_attrs);
2283 transport_container_unregister(&i->rport_attr_cont);
2284 transport_container_unregister(&i->vport_attr_cont);
2285
2286 kfree(i);
2287 }
2288 EXPORT_SYMBOL(fc_release_transport);
2289
2290 /**
2291 * fc_queue_work - Queue work to the fc_host workqueue.
2292 * @shost: Pointer to Scsi_Host bound to fc_host.
2293 * @work: Work to queue for execution.
2294 *
2295 * Return value:
2296 * 1 - work queued for execution
2297 * 0 - work is already queued
2298 * -EINVAL - work queue doesn't exist
2299 */
2300 static int
2301 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2302 {
2303 if (unlikely(!fc_host_work_q(shost))) {
2304 printk(KERN_ERR
2305 "ERROR: FC host '%s' attempted to queue work, "
2306 "when no workqueue created.\n", shost->hostt->name);
2307 dump_stack();
2308
2309 return -EINVAL;
2310 }
2311
2312 return queue_work(fc_host_work_q(shost), work);
2313 }
2314
2315 /**
2316 * fc_flush_work - Flush a fc_host's workqueue.
2317 * @shost: Pointer to Scsi_Host bound to fc_host.
2318 */
2319 static void
2320 fc_flush_work(struct Scsi_Host *shost)
2321 {
2322 if (!fc_host_work_q(shost)) {
2323 printk(KERN_ERR
2324 "ERROR: FC host '%s' attempted to flush work, "
2325 "when no workqueue created.\n", shost->hostt->name);
2326 dump_stack();
2327 return;
2328 }
2329
2330 flush_workqueue(fc_host_work_q(shost));
2331 }
2332
2333 /**
2334 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2335 * @shost: Pointer to Scsi_Host bound to fc_host.
2336 * @work: Work to queue for execution.
2337 * @delay: jiffies to delay the work queuing
2338 *
2339 * Return value:
2340 * 1 on success / 0 already queued / < 0 for error
2341 */
2342 static int
2343 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2344 unsigned long delay)
2345 {
2346 if (unlikely(!fc_host_devloss_work_q(shost))) {
2347 printk(KERN_ERR
2348 "ERROR: FC host '%s' attempted to queue work, "
2349 "when no workqueue created.\n", shost->hostt->name);
2350 dump_stack();
2351
2352 return -EINVAL;
2353 }
2354
2355 return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2356 }
2357
2358 /**
2359 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2360 * @shost: Pointer to Scsi_Host bound to fc_host.
2361 */
2362 static void
2363 fc_flush_devloss(struct Scsi_Host *shost)
2364 {
2365 if (!fc_host_devloss_work_q(shost)) {
2366 printk(KERN_ERR
2367 "ERROR: FC host '%s' attempted to flush work, "
2368 "when no workqueue created.\n", shost->hostt->name);
2369 dump_stack();
2370 return;
2371 }
2372
2373 flush_workqueue(fc_host_devloss_work_q(shost));
2374 }
2375
2376
2377 /**
2378 * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2379 * @shost: Which &Scsi_Host
2380 *
2381 * This routine is expected to be called immediately preceeding the
2382 * a driver's call to scsi_remove_host().
2383 *
2384 * WARNING: A driver utilizing the fc_transport, which fails to call
2385 * this routine prior to scsi_remove_host(), will leave dangling
2386 * objects in /sys/class/fc_remote_ports. Access to any of these
2387 * objects can result in a system crash !!!
2388 *
2389 * Notes:
2390 * This routine assumes no locks are held on entry.
2391 */
2392 void
2393 fc_remove_host(struct Scsi_Host *shost)
2394 {
2395 struct fc_vport *vport = NULL, *next_vport = NULL;
2396 struct fc_rport *rport = NULL, *next_rport = NULL;
2397 struct workqueue_struct *work_q;
2398 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2399 unsigned long flags;
2400
2401 spin_lock_irqsave(shost->host_lock, flags);
2402
2403 /* Remove any vports */
2404 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2405 fc_queue_work(shost, &vport->vport_delete_work);
2406
2407 /* Remove any remote ports */
2408 list_for_each_entry_safe(rport, next_rport,
2409 &fc_host->rports, peers) {
2410 list_del(&rport->peers);
2411 rport->port_state = FC_PORTSTATE_DELETED;
2412 fc_queue_work(shost, &rport->rport_delete_work);
2413 }
2414
2415 list_for_each_entry_safe(rport, next_rport,
2416 &fc_host->rport_bindings, peers) {
2417 list_del(&rport->peers);
2418 rport->port_state = FC_PORTSTATE_DELETED;
2419 fc_queue_work(shost, &rport->rport_delete_work);
2420 }
2421
2422 spin_unlock_irqrestore(shost->host_lock, flags);
2423
2424 /* flush all scan work items */
2425 scsi_flush_work(shost);
2426
2427 /* flush all stgt delete, and rport delete work items, then kill it */
2428 if (fc_host->work_q) {
2429 work_q = fc_host->work_q;
2430 fc_host->work_q = NULL;
2431 destroy_workqueue(work_q);
2432 }
2433
2434 /* flush all devloss work items, then kill it */
2435 if (fc_host->devloss_work_q) {
2436 work_q = fc_host->devloss_work_q;
2437 fc_host->devloss_work_q = NULL;
2438 destroy_workqueue(work_q);
2439 }
2440 }
2441 EXPORT_SYMBOL(fc_remove_host);
2442
2443 static void fc_terminate_rport_io(struct fc_rport *rport)
2444 {
2445 struct Scsi_Host *shost = rport_to_shost(rport);
2446 struct fc_internal *i = to_fc_internal(shost->transportt);
2447
2448 /* Involve the LLDD if possible to terminate all io on the rport. */
2449 if (i->f->terminate_rport_io)
2450 i->f->terminate_rport_io(rport);
2451
2452 /*
2453 * must unblock to flush queued IO. The caller will have set
2454 * the port_state or flags, so that fc_remote_port_chkready will
2455 * fail IO.
2456 */
2457 scsi_target_unblock(&rport->dev);
2458 }
2459
2460 /**
2461 * fc_starget_delete - called to delete the scsi decendents of an rport
2462 * @work: remote port to be operated on.
2463 *
2464 * Deletes target and all sdevs.
2465 */
2466 static void
2467 fc_starget_delete(struct work_struct *work)
2468 {
2469 struct fc_rport *rport =
2470 container_of(work, struct fc_rport, stgt_delete_work);
2471
2472 fc_terminate_rport_io(rport);
2473 scsi_remove_target(&rport->dev);
2474 }
2475
2476
2477 /**
2478 * fc_rport_final_delete - finish rport termination and delete it.
2479 * @work: remote port to be deleted.
2480 */
2481 static void
2482 fc_rport_final_delete(struct work_struct *work)
2483 {
2484 struct fc_rport *rport =
2485 container_of(work, struct fc_rport, rport_delete_work);
2486 struct device *dev = &rport->dev;
2487 struct Scsi_Host *shost = rport_to_shost(rport);
2488 struct fc_internal *i = to_fc_internal(shost->transportt);
2489 unsigned long flags;
2490 int do_callback = 0;
2491
2492 /*
2493 * if a scan is pending, flush the SCSI Host work_q so that
2494 * that we can reclaim the rport scan work element.
2495 */
2496 if (rport->flags & FC_RPORT_SCAN_PENDING)
2497 scsi_flush_work(shost);
2498
2499 fc_terminate_rport_io(rport);
2500
2501 /*
2502 * Cancel any outstanding timers. These should really exist
2503 * only when rmmod'ing the LLDD and we're asking for
2504 * immediate termination of the rports
2505 */
2506 spin_lock_irqsave(shost->host_lock, flags);
2507 if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2508 spin_unlock_irqrestore(shost->host_lock, flags);
2509 if (!cancel_delayed_work(&rport->fail_io_work))
2510 fc_flush_devloss(shost);
2511 if (!cancel_delayed_work(&rport->dev_loss_work))
2512 fc_flush_devloss(shost);
2513 spin_lock_irqsave(shost->host_lock, flags);
2514 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2515 }
2516 spin_unlock_irqrestore(shost->host_lock, flags);
2517
2518 /* Delete SCSI target and sdevs */
2519 if (rport->scsi_target_id != -1)
2520 fc_starget_delete(&rport->stgt_delete_work);
2521
2522 /*
2523 * Notify the driver that the rport is now dead. The LLDD will
2524 * also guarantee that any communication to the rport is terminated
2525 *
2526 * Avoid this call if we already called it when we preserved the
2527 * rport for the binding.
2528 */
2529 spin_lock_irqsave(shost->host_lock, flags);
2530 if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2531 (i->f->dev_loss_tmo_callbk)) {
2532 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2533 do_callback = 1;
2534 }
2535 spin_unlock_irqrestore(shost->host_lock, flags);
2536
2537 if (do_callback)
2538 i->f->dev_loss_tmo_callbk(rport);
2539
2540 fc_bsg_remove(rport->rqst_q);
2541
2542 transport_remove_device(dev);
2543 device_del(dev);
2544 transport_destroy_device(dev);
2545 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2546 put_device(dev); /* for self-reference */
2547 }
2548
2549
2550 /**
2551 * fc_rport_create - allocates and creates a remote FC port.
2552 * @shost: scsi host the remote port is connected to.
2553 * @channel: Channel on shost port connected to.
2554 * @ids: The world wide names, fc address, and FC4 port
2555 * roles for the remote port.
2556 *
2557 * Allocates and creates the remoter port structure, including the
2558 * class and sysfs creation.
2559 *
2560 * Notes:
2561 * This routine assumes no locks are held on entry.
2562 */
2563 static struct fc_rport *
2564 fc_rport_create(struct Scsi_Host *shost, int channel,
2565 struct fc_rport_identifiers *ids)
2566 {
2567 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2568 struct fc_internal *fci = to_fc_internal(shost->transportt);
2569 struct fc_rport *rport;
2570 struct device *dev;
2571 unsigned long flags;
2572 int error;
2573 size_t size;
2574
2575 size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2576 rport = kzalloc(size, GFP_KERNEL);
2577 if (unlikely(!rport)) {
2578 printk(KERN_ERR "%s: allocation failure\n", __func__);
2579 return NULL;
2580 }
2581
2582 rport->maxframe_size = -1;
2583 rport->supported_classes = FC_COS_UNSPECIFIED;
2584 rport->dev_loss_tmo = fc_host->dev_loss_tmo;
2585 memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2586 memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2587 rport->port_id = ids->port_id;
2588 rport->roles = ids->roles;
2589 rport->port_state = FC_PORTSTATE_ONLINE;
2590 if (fci->f->dd_fcrport_size)
2591 rport->dd_data = &rport[1];
2592 rport->channel = channel;
2593 rport->fast_io_fail_tmo = -1;
2594
2595 INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2596 INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2597 INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2598 INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2599 INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2600
2601 spin_lock_irqsave(shost->host_lock, flags);
2602
2603 rport->number = fc_host->next_rport_number++;
2604 if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2605 rport->scsi_target_id = fc_host->next_target_id++;
2606 else
2607 rport->scsi_target_id = -1;
2608 list_add_tail(&rport->peers, &fc_host->rports);
2609 get_device(&shost->shost_gendev); /* for fc_host->rport list */
2610
2611 spin_unlock_irqrestore(shost->host_lock, flags);
2612
2613 dev = &rport->dev;
2614 device_initialize(dev); /* takes self reference */
2615 dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2616 dev->release = fc_rport_dev_release;
2617 dev_set_name(dev, "rport-%d:%d-%d",
2618 shost->host_no, channel, rport->number);
2619 transport_setup_device(dev);
2620
2621 error = device_add(dev);
2622 if (error) {
2623 printk(KERN_ERR "FC Remote Port device_add failed\n");
2624 goto delete_rport;
2625 }
2626 transport_add_device(dev);
2627 transport_configure_device(dev);
2628
2629 fc_bsg_rportadd(shost, rport);
2630 /* ignore any bsg add error - we just can't do sgio */
2631
2632 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2633 /* initiate a scan of the target */
2634 rport->flags |= FC_RPORT_SCAN_PENDING;
2635 scsi_queue_work(shost, &rport->scan_work);
2636 }
2637
2638 return rport;
2639
2640 delete_rport:
2641 transport_destroy_device(dev);
2642 spin_lock_irqsave(shost->host_lock, flags);
2643 list_del(&rport->peers);
2644 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2645 spin_unlock_irqrestore(shost->host_lock, flags);
2646 put_device(dev->parent);
2647 kfree(rport);
2648 return NULL;
2649 }
2650
2651 /**
2652 * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2653 * @shost: scsi host the remote port is connected to.
2654 * @channel: Channel on shost port connected to.
2655 * @ids: The world wide names, fc address, and FC4 port
2656 * roles for the remote port.
2657 *
2658 * The LLDD calls this routine to notify the transport of the existence
2659 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2660 * of the port, it's FC address (port_id), and the FC4 roles that are
2661 * active for the port.
2662 *
2663 * For ports that are FCP targets (aka scsi targets), the FC transport
2664 * maintains consistent target id bindings on behalf of the LLDD.
2665 * A consistent target id binding is an assignment of a target id to
2666 * a remote port identifier, which persists while the scsi host is
2667 * attached. The remote port can disappear, then later reappear, and
2668 * it's target id assignment remains the same. This allows for shifts
2669 * in FC addressing (if binding by wwpn or wwnn) with no apparent
2670 * changes to the scsi subsystem which is based on scsi host number and
2671 * target id values. Bindings are only valid during the attachment of
2672 * the scsi host. If the host detaches, then later re-attaches, target
2673 * id bindings may change.
2674 *
2675 * This routine is responsible for returning a remote port structure.
2676 * The routine will search the list of remote ports it maintains
2677 * internally on behalf of consistent target id mappings. If found, the
2678 * remote port structure will be reused. Otherwise, a new remote port
2679 * structure will be allocated.
2680 *
2681 * Whenever a remote port is allocated, a new fc_remote_port class
2682 * device is created.
2683 *
2684 * Should not be called from interrupt context.
2685 *
2686 * Notes:
2687 * This routine assumes no locks are held on entry.
2688 */
2689 struct fc_rport *
2690 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2691 struct fc_rport_identifiers *ids)
2692 {
2693 struct fc_internal *fci = to_fc_internal(shost->transportt);
2694 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2695 struct fc_rport *rport;
2696 unsigned long flags;
2697 int match = 0;
2698
2699 /* ensure any stgt delete functions are done */
2700 fc_flush_work(shost);
2701
2702 /*
2703 * Search the list of "active" rports, for an rport that has been
2704 * deleted, but we've held off the real delete while the target
2705 * is in a "blocked" state.
2706 */
2707 spin_lock_irqsave(shost->host_lock, flags);
2708
2709 list_for_each_entry(rport, &fc_host->rports, peers) {
2710
2711 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2712 (rport->channel == channel)) {
2713
2714 switch (fc_host->tgtid_bind_type) {
2715 case FC_TGTID_BIND_BY_WWPN:
2716 case FC_TGTID_BIND_NONE:
2717 if (rport->port_name == ids->port_name)
2718 match = 1;
2719 break;
2720 case FC_TGTID_BIND_BY_WWNN:
2721 if (rport->node_name == ids->node_name)
2722 match = 1;
2723 break;
2724 case FC_TGTID_BIND_BY_ID:
2725 if (rport->port_id == ids->port_id)
2726 match = 1;
2727 break;
2728 }
2729
2730 if (match) {
2731
2732 memcpy(&rport->node_name, &ids->node_name,
2733 sizeof(rport->node_name));
2734 memcpy(&rport->port_name, &ids->port_name,
2735 sizeof(rport->port_name));
2736 rport->port_id = ids->port_id;
2737
2738 rport->port_state = FC_PORTSTATE_ONLINE;
2739 rport->roles = ids->roles;
2740
2741 spin_unlock_irqrestore(shost->host_lock, flags);
2742
2743 if (fci->f->dd_fcrport_size)
2744 memset(rport->dd_data, 0,
2745 fci->f->dd_fcrport_size);
2746
2747 /*
2748 * If we were not a target, cancel the
2749 * io terminate and rport timers, and
2750 * we're done.
2751 *
2752 * If we were a target, but our new role
2753 * doesn't indicate a target, leave the
2754 * timers running expecting the role to
2755 * change as the target fully logs in. If
2756 * it doesn't, the target will be torn down.
2757 *
2758 * If we were a target, and our role shows
2759 * we're still a target, cancel the timers
2760 * and kick off a scan.
2761 */
2762
2763 /* was a target, not in roles */
2764 if ((rport->scsi_target_id != -1) &&
2765 (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2766 return rport;
2767
2768 /*
2769 * Stop the fail io and dev_loss timers.
2770 * If they flush, the port_state will
2771 * be checked and will NOOP the function.
2772 */
2773 if (!cancel_delayed_work(&rport->fail_io_work))
2774 fc_flush_devloss(shost);
2775 if (!cancel_delayed_work(&rport->dev_loss_work))
2776 fc_flush_devloss(shost);
2777
2778 spin_lock_irqsave(shost->host_lock, flags);
2779
2780 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2781 FC_RPORT_DEVLOSS_PENDING |
2782 FC_RPORT_DEVLOSS_CALLBK_DONE);
2783
2784 /* if target, initiate a scan */
2785 if (rport->scsi_target_id != -1) {
2786 rport->flags |= FC_RPORT_SCAN_PENDING;
2787 scsi_queue_work(shost,
2788 &rport->scan_work);
2789 spin_unlock_irqrestore(shost->host_lock,
2790 flags);
2791 scsi_target_unblock(&rport->dev);
2792 } else
2793 spin_unlock_irqrestore(shost->host_lock,
2794 flags);
2795
2796 fc_bsg_goose_queue(rport);
2797
2798 return rport;
2799 }
2800 }
2801 }
2802
2803 /*
2804 * Search the bindings array
2805 * Note: if never a FCP target, you won't be on this list
2806 */
2807 if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2808
2809 /* search for a matching consistent binding */
2810
2811 list_for_each_entry(rport, &fc_host->rport_bindings,
2812 peers) {
2813 if (rport->channel != channel)
2814 continue;
2815
2816 switch (fc_host->tgtid_bind_type) {
2817 case FC_TGTID_BIND_BY_WWPN:
2818 if (rport->port_name == ids->port_name)
2819 match = 1;
2820 break;
2821 case FC_TGTID_BIND_BY_WWNN:
2822 if (rport->node_name == ids->node_name)
2823 match = 1;
2824 break;
2825 case FC_TGTID_BIND_BY_ID:
2826 if (rport->port_id == ids->port_id)
2827 match = 1;
2828 break;
2829 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2830 break;
2831 }
2832
2833 if (match) {
2834 list_move_tail(&rport->peers, &fc_host->rports);
2835 break;
2836 }
2837 }
2838
2839 if (match) {
2840 memcpy(&rport->node_name, &ids->node_name,
2841 sizeof(rport->node_name));
2842 memcpy(&rport->port_name, &ids->port_name,
2843 sizeof(rport->port_name));
2844 rport->port_id = ids->port_id;
2845 rport->roles = ids->roles;
2846 rport->port_state = FC_PORTSTATE_ONLINE;
2847 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2848
2849 if (fci->f->dd_fcrport_size)
2850 memset(rport->dd_data, 0,
2851 fci->f->dd_fcrport_size);
2852
2853 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2854 /* initiate a scan of the target */
2855 rport->flags |= FC_RPORT_SCAN_PENDING;
2856 scsi_queue_work(shost, &rport->scan_work);
2857 spin_unlock_irqrestore(shost->host_lock, flags);
2858 scsi_target_unblock(&rport->dev);
2859 } else
2860 spin_unlock_irqrestore(shost->host_lock, flags);
2861
2862 return rport;
2863 }
2864 }
2865
2866 spin_unlock_irqrestore(shost->host_lock, flags);
2867
2868 /* No consistent binding found - create new remote port entry */
2869 rport = fc_rport_create(shost, channel, ids);
2870
2871 return rport;
2872 }
2873 EXPORT_SYMBOL(fc_remote_port_add);
2874
2875
2876 /**
2877 * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2878 * @rport: The remote port that no longer exists
2879 *
2880 * The LLDD calls this routine to notify the transport that a remote
2881 * port is no longer part of the topology. Note: Although a port
2882 * may no longer be part of the topology, it may persist in the remote
2883 * ports displayed by the fc_host. We do this under 2 conditions:
2884 * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2885 * This allows the port to temporarily disappear, then reappear without
2886 * disrupting the SCSI device tree attached to it. During the "blocked"
2887 * period the port will still exist.
2888 * 2) If the port was a scsi target and disappears for longer than we
2889 * expect, we'll delete the port and the tear down the SCSI device tree
2890 * attached to it. However, we want to semi-persist the target id assigned
2891 * to that port if it eventually does exist. The port structure will
2892 * remain (although with minimal information) so that the target id
2893 * bindings remails.
2894 *
2895 * If the remote port is not an FCP Target, it will be fully torn down
2896 * and deallocated, including the fc_remote_port class device.
2897 *
2898 * If the remote port is an FCP Target, the port will be placed in a
2899 * temporary blocked state. From the LLDD's perspective, the rport no
2900 * longer exists. From the SCSI midlayer's perspective, the SCSI target
2901 * exists, but all sdevs on it are blocked from further I/O. The following
2902 * is then expected.
2903 *
2904 * If the remote port does not return (signaled by a LLDD call to
2905 * fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2906 * scsi target is removed - killing all outstanding i/o and removing the
2907 * scsi devices attached ot it. The port structure will be marked Not
2908 * Present and be partially cleared, leaving only enough information to
2909 * recognize the remote port relative to the scsi target id binding if
2910 * it later appears. The port will remain as long as there is a valid
2911 * binding (e.g. until the user changes the binding type or unloads the
2912 * scsi host with the binding).
2913 *
2914 * If the remote port returns within the dev_loss_tmo value (and matches
2915 * according to the target id binding type), the port structure will be
2916 * reused. If it is no longer a SCSI target, the target will be torn
2917 * down. If it continues to be a SCSI target, then the target will be
2918 * unblocked (allowing i/o to be resumed), and a scan will be activated
2919 * to ensure that all luns are detected.
2920 *
2921 * Called from normal process context only - cannot be called from interrupt.
2922 *
2923 * Notes:
2924 * This routine assumes no locks are held on entry.
2925 */
2926 void
2927 fc_remote_port_delete(struct fc_rport *rport)
2928 {
2929 struct Scsi_Host *shost = rport_to_shost(rport);
2930 unsigned long timeout = rport->dev_loss_tmo;
2931 unsigned long flags;
2932
2933 /*
2934 * No need to flush the fc_host work_q's, as all adds are synchronous.
2935 *
2936 * We do need to reclaim the rport scan work element, so eventually
2937 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2938 * there's still a scan pending.
2939 */
2940
2941 spin_lock_irqsave(shost->host_lock, flags);
2942
2943 if (rport->port_state != FC_PORTSTATE_ONLINE) {
2944 spin_unlock_irqrestore(shost->host_lock, flags);
2945 return;
2946 }
2947
2948 /*
2949 * In the past, we if this was not an FCP-Target, we would
2950 * unconditionally just jump to deleting the rport.
2951 * However, rports can be used as node containers by the LLDD,
2952 * and its not appropriate to just terminate the rport at the
2953 * first sign of a loss in connectivity. The LLDD may want to
2954 * send ELS traffic to re-validate the login. If the rport is
2955 * immediately deleted, it makes it inappropriate for a node
2956 * container.
2957 * So... we now unconditionally wait dev_loss_tmo before
2958 * destroying an rport.
2959 */
2960
2961 rport->port_state = FC_PORTSTATE_BLOCKED;
2962
2963 rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2964
2965 spin_unlock_irqrestore(shost->host_lock, flags);
2966
2967 if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2968 shost->active_mode & MODE_TARGET)
2969 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2970
2971 scsi_target_block(&rport->dev);
2972
2973 /* see if we need to kill io faster than waiting for device loss */
2974 if ((rport->fast_io_fail_tmo != -1) &&
2975 (rport->fast_io_fail_tmo < timeout))
2976 fc_queue_devloss_work(shost, &rport->fail_io_work,
2977 rport->fast_io_fail_tmo * HZ);
2978
2979 /* cap the length the devices can be blocked until they are deleted */
2980 fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2981 }
2982 EXPORT_SYMBOL(fc_remote_port_delete);
2983
2984 /**
2985 * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
2986 * @rport: The remote port that changed.
2987 * @roles: New roles for this port.
2988 *
2989 * Description: The LLDD calls this routine to notify the transport that the
2990 * roles on a remote port may have changed. The largest effect of this is
2991 * if a port now becomes a FCP Target, it must be allocated a
2992 * scsi target id. If the port is no longer a FCP target, any
2993 * scsi target id value assigned to it will persist in case the
2994 * role changes back to include FCP Target. No changes in the scsi
2995 * midlayer will be invoked if the role changes (in the expectation
2996 * that the role will be resumed. If it doesn't normal error processing
2997 * will take place).
2998 *
2999 * Should not be called from interrupt context.
3000 *
3001 * Notes:
3002 * This routine assumes no locks are held on entry.
3003 */
3004 void
3005 fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
3006 {
3007 struct Scsi_Host *shost = rport_to_shost(rport);
3008 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3009 unsigned long flags;
3010 int create = 0;
3011 int ret;
3012
3013 spin_lock_irqsave(shost->host_lock, flags);
3014 if (roles & FC_PORT_ROLE_FCP_TARGET) {
3015 if (rport->scsi_target_id == -1) {
3016 rport->scsi_target_id = fc_host->next_target_id++;
3017 create = 1;
3018 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3019 create = 1;
3020 } else if (shost->active_mode & MODE_TARGET) {
3021 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
3022 (char *)&rport->node_name);
3023 if (ret)
3024 printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
3025 ret);
3026 }
3027
3028 rport->roles = roles;
3029
3030 spin_unlock_irqrestore(shost->host_lock, flags);
3031
3032 if (create) {
3033 /*
3034 * There may have been a delete timer running on the
3035 * port. Ensure that it is cancelled as we now know
3036 * the port is an FCP Target.
3037 * Note: we know the rport is exists and in an online
3038 * state as the LLDD would not have had an rport
3039 * reference to pass us.
3040 *
3041 * Take no action on the del_timer failure as the state
3042 * machine state change will validate the
3043 * transaction.
3044 */
3045 if (!cancel_delayed_work(&rport->fail_io_work))
3046 fc_flush_devloss(shost);
3047 if (!cancel_delayed_work(&rport->dev_loss_work))
3048 fc_flush_devloss(shost);
3049
3050 spin_lock_irqsave(shost->host_lock, flags);
3051 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3052 FC_RPORT_DEVLOSS_PENDING);
3053 spin_unlock_irqrestore(shost->host_lock, flags);
3054
3055 /* ensure any stgt delete functions are done */
3056 fc_flush_work(shost);
3057
3058 /* initiate a scan of the target */
3059 spin_lock_irqsave(shost->host_lock, flags);
3060 rport->flags |= FC_RPORT_SCAN_PENDING;
3061 scsi_queue_work(shost, &rport->scan_work);
3062 spin_unlock_irqrestore(shost->host_lock, flags);
3063 scsi_target_unblock(&rport->dev);
3064 }
3065 }
3066 EXPORT_SYMBOL(fc_remote_port_rolechg);
3067
3068 /**
3069 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3070 * @work: rport target that failed to reappear in the allotted time.
3071 *
3072 * Description: An attempt to delete a remote port blocks, and if it fails
3073 * to return in the allotted time this gets called.
3074 */
3075 static void
3076 fc_timeout_deleted_rport(struct work_struct *work)
3077 {
3078 struct fc_rport *rport =
3079 container_of(work, struct fc_rport, dev_loss_work.work);
3080 struct Scsi_Host *shost = rport_to_shost(rport);
3081 struct fc_internal *i = to_fc_internal(shost->transportt);
3082 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3083 unsigned long flags;
3084 int do_callback = 0;
3085
3086 spin_lock_irqsave(shost->host_lock, flags);
3087
3088 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3089
3090 /*
3091 * If the port is ONLINE, then it came back. If it was a SCSI
3092 * target, validate it still is. If not, tear down the
3093 * scsi_target on it.
3094 */
3095 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3096 (rport->scsi_target_id != -1) &&
3097 !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3098 dev_printk(KERN_ERR, &rport->dev,
3099 "blocked FC remote port time out: no longer"
3100 " a FCP target, removing starget\n");
3101 spin_unlock_irqrestore(shost->host_lock, flags);
3102 scsi_target_unblock(&rport->dev);
3103 fc_queue_work(shost, &rport->stgt_delete_work);
3104 return;
3105 }
3106
3107 /* NOOP state - we're flushing workq's */
3108 if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3109 spin_unlock_irqrestore(shost->host_lock, flags);
3110 dev_printk(KERN_ERR, &rport->dev,
3111 "blocked FC remote port time out: leaving"
3112 " rport%s alone\n",
3113 (rport->scsi_target_id != -1) ? " and starget" : "");
3114 return;
3115 }
3116
3117 if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3118 (rport->scsi_target_id == -1)) {
3119 list_del(&rport->peers);
3120 rport->port_state = FC_PORTSTATE_DELETED;
3121 dev_printk(KERN_ERR, &rport->dev,
3122 "blocked FC remote port time out: removing"
3123 " rport%s\n",
3124 (rport->scsi_target_id != -1) ? " and starget" : "");
3125 fc_queue_work(shost, &rport->rport_delete_work);
3126 spin_unlock_irqrestore(shost->host_lock, flags);
3127 return;
3128 }
3129
3130 dev_printk(KERN_ERR, &rport->dev,
3131 "blocked FC remote port time out: removing target and "
3132 "saving binding\n");
3133
3134 list_move_tail(&rport->peers, &fc_host->rport_bindings);
3135
3136 /*
3137 * Note: We do not remove or clear the hostdata area. This allows
3138 * host-specific target data to persist along with the
3139 * scsi_target_id. It's up to the host to manage it's hostdata area.
3140 */
3141
3142 /*
3143 * Reinitialize port attributes that may change if the port comes back.
3144 */
3145 rport->maxframe_size = -1;
3146 rport->supported_classes = FC_COS_UNSPECIFIED;
3147 rport->roles = FC_PORT_ROLE_UNKNOWN;
3148 rport->port_state = FC_PORTSTATE_NOTPRESENT;
3149 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3150
3151 /*
3152 * Pre-emptively kill I/O rather than waiting for the work queue
3153 * item to teardown the starget. (FCOE libFC folks prefer this
3154 * and to have the rport_port_id still set when it's done).
3155 */
3156 spin_unlock_irqrestore(shost->host_lock, flags);
3157 fc_terminate_rport_io(rport);
3158
3159 spin_lock_irqsave(shost->host_lock, flags);
3160
3161 if (rport->port_state == FC_PORTSTATE_NOTPRESENT) { /* still missing */
3162
3163 /* remove the identifiers that aren't used in the consisting binding */
3164 switch (fc_host->tgtid_bind_type) {
3165 case FC_TGTID_BIND_BY_WWPN:
3166 rport->node_name = -1;
3167 rport->port_id = -1;
3168 break;
3169 case FC_TGTID_BIND_BY_WWNN:
3170 rport->port_name = -1;
3171 rport->port_id = -1;
3172 break;
3173 case FC_TGTID_BIND_BY_ID:
3174 rport->node_name = -1;
3175 rport->port_name = -1;
3176 break;
3177 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3178 break;
3179 }
3180
3181 /*
3182 * As this only occurs if the remote port (scsi target)
3183 * went away and didn't come back - we'll remove
3184 * all attached scsi devices.
3185 */
3186 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3187 fc_queue_work(shost, &rport->stgt_delete_work);
3188
3189 do_callback = 1;
3190 }
3191
3192 spin_unlock_irqrestore(shost->host_lock, flags);
3193
3194 /*
3195 * Notify the driver that the rport is now dead. The LLDD will
3196 * also guarantee that any communication to the rport is terminated
3197 *
3198 * Note: we set the CALLBK_DONE flag above to correspond
3199 */
3200 if (do_callback && i->f->dev_loss_tmo_callbk)
3201 i->f->dev_loss_tmo_callbk(rport);
3202 }
3203
3204
3205 /**
3206 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3207 * @work: rport to terminate io on.
3208 *
3209 * Notes: Only requests the failure of the io, not that all are flushed
3210 * prior to returning.
3211 */
3212 static void
3213 fc_timeout_fail_rport_io(struct work_struct *work)
3214 {
3215 struct fc_rport *rport =
3216 container_of(work, struct fc_rport, fail_io_work.work);
3217
3218 if (rport->port_state != FC_PORTSTATE_BLOCKED)
3219 return;
3220
3221 rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3222 fc_terminate_rport_io(rport);
3223 }
3224
3225 /**
3226 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3227 * @work: remote port to be scanned.
3228 */
3229 static void
3230 fc_scsi_scan_rport(struct work_struct *work)
3231 {
3232 struct fc_rport *rport =
3233 container_of(work, struct fc_rport, scan_work);
3234 struct Scsi_Host *shost = rport_to_shost(rport);
3235 struct fc_internal *i = to_fc_internal(shost->transportt);
3236 unsigned long flags;
3237
3238 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3239 (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3240 !(i->f->disable_target_scan)) {
3241 scsi_scan_target(&rport->dev, rport->channel,
3242 rport->scsi_target_id, SCAN_WILD_CARD, 1);
3243 }
3244
3245 spin_lock_irqsave(shost->host_lock, flags);
3246 rport->flags &= ~FC_RPORT_SCAN_PENDING;
3247 spin_unlock_irqrestore(shost->host_lock, flags);
3248 }
3249
3250 /**
3251 * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3252 * @cmnd: SCSI command that scsi_eh is trying to recover
3253 *
3254 * This routine can be called from a FC LLD scsi_eh callback. It
3255 * blocks the scsi_eh thread until the fc_rport leaves the
3256 * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3257 * necessary to avoid the scsi_eh failing recovery actions for blocked
3258 * rports which would lead to offlined SCSI devices.
3259 *
3260 * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3261 * FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3262 * passed back to scsi_eh.
3263 */
3264 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3265 {
3266 struct Scsi_Host *shost = cmnd->device->host;
3267 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3268 unsigned long flags;
3269
3270 spin_lock_irqsave(shost->host_lock, flags);
3271 while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3272 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3273 spin_unlock_irqrestore(shost->host_lock, flags);
3274 msleep(1000);
3275 spin_lock_irqsave(shost->host_lock, flags);
3276 }
3277 spin_unlock_irqrestore(shost->host_lock, flags);
3278
3279 if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3280 return FAST_IO_FAIL;
3281
3282 return 0;
3283 }
3284 EXPORT_SYMBOL(fc_block_scsi_eh);
3285
3286 /**
3287 * fc_vport_setup - allocates and creates a FC virtual port.
3288 * @shost: scsi host the virtual port is connected to.
3289 * @channel: Channel on shost port connected to.
3290 * @pdev: parent device for vport
3291 * @ids: The world wide names, FC4 port roles, etc for
3292 * the virtual port.
3293 * @ret_vport: The pointer to the created vport.
3294 *
3295 * Allocates and creates the vport structure, calls the parent host
3296 * to instantiate the vport, the completes w/ class and sysfs creation.
3297 *
3298 * Notes:
3299 * This routine assumes no locks are held on entry.
3300 */
3301 static int
3302 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3303 struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
3304 {
3305 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3306 struct fc_internal *fci = to_fc_internal(shost->transportt);
3307 struct fc_vport *vport;
3308 struct device *dev;
3309 unsigned long flags;
3310 size_t size;
3311 int error;
3312
3313 *ret_vport = NULL;
3314
3315 if ( ! fci->f->vport_create)
3316 return -ENOENT;
3317
3318 size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3319 vport = kzalloc(size, GFP_KERNEL);
3320 if (unlikely(!vport)) {
3321 printk(KERN_ERR "%s: allocation failure\n", __func__);
3322 return -ENOMEM;
3323 }
3324
3325 vport->vport_state = FC_VPORT_UNKNOWN;
3326 vport->vport_last_state = FC_VPORT_UNKNOWN;
3327 vport->node_name = ids->node_name;
3328 vport->port_name = ids->port_name;
3329 vport->roles = ids->roles;
3330 vport->vport_type = ids->vport_type;
3331 if (fci->f->dd_fcvport_size)
3332 vport->dd_data = &vport[1];
3333 vport->shost = shost;
3334 vport->channel = channel;
3335 vport->flags = FC_VPORT_CREATING;
3336 INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3337
3338 spin_lock_irqsave(shost->host_lock, flags);
3339
3340 if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3341 spin_unlock_irqrestore(shost->host_lock, flags);
3342 kfree(vport);
3343 return -ENOSPC;
3344 }
3345 fc_host->npiv_vports_inuse++;
3346 vport->number = fc_host->next_vport_number++;
3347 list_add_tail(&vport->peers, &fc_host->vports);
3348 get_device(&shost->shost_gendev); /* for fc_host->vport list */
3349
3350 spin_unlock_irqrestore(shost->host_lock, flags);
3351
3352 dev = &vport->dev;
3353 device_initialize(dev); /* takes self reference */
3354 dev->parent = get_device(pdev); /* takes parent reference */
3355 dev->release = fc_vport_dev_release;
3356 dev_set_name(dev, "vport-%d:%d-%d",
3357 shost->host_no, channel, vport->number);
3358 transport_setup_device(dev);
3359
3360 error = device_add(dev);
3361 if (error) {
3362 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3363 goto delete_vport;
3364 }
3365 transport_add_device(dev);
3366 transport_configure_device(dev);
3367
3368 error = fci->f->vport_create(vport, ids->disable);
3369 if (error) {
3370 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3371 goto delete_vport_all;
3372 }
3373
3374 /*
3375 * if the parent isn't the physical adapter's Scsi_Host, ensure
3376 * the Scsi_Host at least contains ia symlink to the vport.
3377 */
3378 if (pdev != &shost->shost_gendev) {
3379 error = sysfs_create_link(&shost->shost_gendev.kobj,
3380 &dev->kobj, dev_name(dev));
3381 if (error)
3382 printk(KERN_ERR
3383 "%s: Cannot create vport symlinks for "
3384 "%s, err=%d\n",
3385 __func__, dev_name(dev), error);
3386 }
3387 spin_lock_irqsave(shost->host_lock, flags);
3388 vport->flags &= ~FC_VPORT_CREATING;
3389 spin_unlock_irqrestore(shost->host_lock, flags);
3390
3391 dev_printk(KERN_NOTICE, pdev,
3392 "%s created via shost%d channel %d\n", dev_name(dev),
3393 shost->host_no, channel);
3394
3395 *ret_vport = vport;
3396
3397 return 0;
3398
3399 delete_vport_all:
3400 transport_remove_device(dev);
3401 device_del(dev);
3402 delete_vport:
3403 transport_destroy_device(dev);
3404 spin_lock_irqsave(shost->host_lock, flags);
3405 list_del(&vport->peers);
3406 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3407 fc_host->npiv_vports_inuse--;
3408 spin_unlock_irqrestore(shost->host_lock, flags);
3409 put_device(dev->parent);
3410 kfree(vport);
3411
3412 return error;
3413 }
3414
3415 /**
3416 * fc_vport_create - Admin App or LLDD requests creation of a vport
3417 * @shost: scsi host the virtual port is connected to.
3418 * @channel: channel on shost port connected to.
3419 * @ids: The world wide names, FC4 port roles, etc for
3420 * the virtual port.
3421 *
3422 * Notes:
3423 * This routine assumes no locks are held on entry.
3424 */
3425 struct fc_vport *
3426 fc_vport_create(struct Scsi_Host *shost, int channel,
3427 struct fc_vport_identifiers *ids)
3428 {
3429 int stat;
3430 struct fc_vport *vport;
3431
3432 stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3433 ids, &vport);
3434 return stat ? NULL : vport;
3435 }
3436 EXPORT_SYMBOL(fc_vport_create);
3437
3438 /**
3439 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3440 * @vport: fc_vport to be terminated
3441 *
3442 * Calls the LLDD vport_delete() function, then deallocates and removes
3443 * the vport from the shost and object tree.
3444 *
3445 * Notes:
3446 * This routine assumes no locks are held on entry.
3447 */
3448 int
3449 fc_vport_terminate(struct fc_vport *vport)
3450 {
3451 struct Scsi_Host *shost = vport_to_shost(vport);
3452 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3453 struct fc_internal *i = to_fc_internal(shost->transportt);
3454 struct device *dev = &vport->dev;
3455 unsigned long flags;
3456 int stat;
3457
3458 if (i->f->vport_delete)
3459 stat = i->f->vport_delete(vport);
3460 else
3461 stat = -ENOENT;
3462
3463 spin_lock_irqsave(shost->host_lock, flags);
3464 vport->flags &= ~FC_VPORT_DELETING;
3465 if (!stat) {
3466 vport->flags |= FC_VPORT_DELETED;
3467 list_del(&vport->peers);
3468 fc_host->npiv_vports_inuse--;
3469 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3470 }
3471 spin_unlock_irqrestore(shost->host_lock, flags);
3472
3473 if (stat)
3474 return stat;
3475
3476 if (dev->parent != &shost->shost_gendev)
3477 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3478 transport_remove_device(dev);
3479 device_del(dev);
3480 transport_destroy_device(dev);
3481
3482 /*
3483 * Removing our self-reference should mean our
3484 * release function gets called, which will drop the remaining
3485 * parent reference and free the data structure.
3486 */
3487 put_device(dev); /* for self-reference */
3488
3489 return 0; /* SUCCESS */
3490 }
3491 EXPORT_SYMBOL(fc_vport_terminate);
3492
3493 /**
3494 * fc_vport_sched_delete - workq-based delete request for a vport
3495 * @work: vport to be deleted.
3496 */
3497 static void
3498 fc_vport_sched_delete(struct work_struct *work)
3499 {
3500 struct fc_vport *vport =
3501 container_of(work, struct fc_vport, vport_delete_work);
3502 int stat;
3503
3504 stat = fc_vport_terminate(vport);
3505 if (stat)
3506 dev_printk(KERN_ERR, vport->dev.parent,
3507 "%s: %s could not be deleted created via "
3508 "shost%d channel %d - error %d\n", __func__,
3509 dev_name(&vport->dev), vport->shost->host_no,
3510 vport->channel, stat);
3511 }
3512
3513
3514 /*
3515 * BSG support
3516 */
3517
3518
3519 /**
3520 * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3521 * @job: fc_bsg_job that is to be torn down
3522 */
3523 static void
3524 fc_destroy_bsgjob(struct fc_bsg_job *job)
3525 {
3526 unsigned long flags;
3527
3528 spin_lock_irqsave(&job->job_lock, flags);
3529 if (job->ref_cnt) {
3530 spin_unlock_irqrestore(&job->job_lock, flags);
3531 return;
3532 }
3533 spin_unlock_irqrestore(&job->job_lock, flags);
3534
3535 put_device(job->dev); /* release reference for the request */
3536
3537 kfree(job->request_payload.sg_list);
3538 kfree(job->reply_payload.sg_list);
3539 kfree(job);
3540 }
3541
3542 /**
3543 * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3544 * completed
3545 * @job: fc_bsg_job that is complete
3546 */
3547 static void
3548 fc_bsg_jobdone(struct fc_bsg_job *job)
3549 {
3550 struct request *req = job->req;
3551 struct request *rsp = req->next_rq;
3552 int err;
3553
3554 err = job->req->errors = job->reply->result;
3555
3556 if (err < 0)
3557 /* we're only returning the result field in the reply */
3558 job->req->sense_len = sizeof(uint32_t);
3559 else
3560 job->req->sense_len = job->reply_len;
3561
3562 /* we assume all request payload was transferred, residual == 0 */
3563 req->resid_len = 0;
3564
3565 if (rsp) {
3566 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3567
3568 /* set reply (bidi) residual */
3569 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3570 rsp->resid_len);
3571 }
3572 blk_complete_request(req);
3573 }
3574
3575 /**
3576 * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3577 * @rq: BSG request that holds the job to be destroyed
3578 */
3579 static void fc_bsg_softirq_done(struct request *rq)
3580 {
3581 struct fc_bsg_job *job = rq->special;
3582 unsigned long flags;
3583
3584 spin_lock_irqsave(&job->job_lock, flags);
3585 job->state_flags |= FC_RQST_STATE_DONE;
3586 job->ref_cnt--;
3587 spin_unlock_irqrestore(&job->job_lock, flags);
3588
3589 blk_end_request_all(rq, rq->errors);
3590 fc_destroy_bsgjob(job);
3591 }
3592
3593 /**
3594 * fc_bsg_job_timeout - handler for when a bsg request timesout
3595 * @req: request that timed out
3596 */
3597 static enum blk_eh_timer_return
3598 fc_bsg_job_timeout(struct request *req)
3599 {
3600 struct fc_bsg_job *job = (void *) req->special;
3601 struct Scsi_Host *shost = job->shost;
3602 struct fc_internal *i = to_fc_internal(shost->transportt);
3603 unsigned long flags;
3604 int err = 0, done = 0;
3605
3606 if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3607 return BLK_EH_RESET_TIMER;
3608
3609 spin_lock_irqsave(&job->job_lock, flags);
3610 if (job->state_flags & FC_RQST_STATE_DONE)
3611 done = 1;
3612 else
3613 job->ref_cnt++;
3614 spin_unlock_irqrestore(&job->job_lock, flags);
3615
3616 if (!done && i->f->bsg_timeout) {
3617 /* call LLDD to abort the i/o as it has timed out */
3618 err = i->f->bsg_timeout(job);
3619 if (err == -EAGAIN) {
3620 job->ref_cnt--;
3621 return BLK_EH_RESET_TIMER;
3622 } else if (err)
3623 printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3624 "abort failed with status %d\n", err);
3625 }
3626
3627 /* the blk_end_sync_io() doesn't check the error */
3628 if (done)
3629 return BLK_EH_NOT_HANDLED;
3630 else
3631 return BLK_EH_HANDLED;
3632 }
3633
3634 static int
3635 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3636 {
3637 size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3638
3639 BUG_ON(!req->nr_phys_segments);
3640
3641 buf->sg_list = kzalloc(sz, GFP_KERNEL);
3642 if (!buf->sg_list)
3643 return -ENOMEM;
3644 sg_init_table(buf->sg_list, req->nr_phys_segments);
3645 buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3646 buf->payload_len = blk_rq_bytes(req);
3647 return 0;
3648 }
3649
3650
3651 /**
3652 * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3653 * bsg request
3654 * @shost: SCSI Host corresponding to the bsg object
3655 * @rport: (optional) FC Remote Port corresponding to the bsg object
3656 * @req: BSG request that needs a job structure
3657 */
3658 static int
3659 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3660 struct request *req)
3661 {
3662 struct fc_internal *i = to_fc_internal(shost->transportt);
3663 struct request *rsp = req->next_rq;
3664 struct fc_bsg_job *job;
3665 int ret;
3666
3667 BUG_ON(req->special);
3668
3669 job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3670 GFP_KERNEL);
3671 if (!job)
3672 return -ENOMEM;
3673
3674 /*
3675 * Note: this is a bit silly.
3676 * The request gets formatted as a SGIO v4 ioctl request, which
3677 * then gets reformatted as a blk request, which then gets
3678 * reformatted as a fc bsg request. And on completion, we have
3679 * to wrap return results such that SGIO v4 thinks it was a scsi
3680 * status. I hope this was all worth it.
3681 */
3682
3683 req->special = job;
3684 job->shost = shost;
3685 job->rport = rport;
3686 job->req = req;
3687 if (i->f->dd_bsg_size)
3688 job->dd_data = (void *)&job[1];
3689 spin_lock_init(&job->job_lock);
3690 job->request = (struct fc_bsg_request *)req->cmd;
3691 job->request_len = req->cmd_len;
3692 job->reply = req->sense;
3693 job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3694 * allocated */
3695 if (req->bio) {
3696 ret = fc_bsg_map_buffer(&job->request_payload, req);
3697 if (ret)
3698 goto failjob_rls_job;
3699 }
3700 if (rsp && rsp->bio) {
3701 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3702 if (ret)
3703 goto failjob_rls_rqst_payload;
3704 }
3705 job->job_done = fc_bsg_jobdone;
3706 if (rport)
3707 job->dev = &rport->dev;
3708 else
3709 job->dev = &shost->shost_gendev;
3710 get_device(job->dev); /* take a reference for the request */
3711
3712 job->ref_cnt = 1;
3713
3714 return 0;
3715
3716
3717 failjob_rls_rqst_payload:
3718 kfree(job->request_payload.sg_list);
3719 failjob_rls_job:
3720 kfree(job);
3721 return -ENOMEM;
3722 }
3723
3724
3725 enum fc_dispatch_result {
3726 FC_DISPATCH_BREAK, /* on return, q is locked, break from q loop */
3727 FC_DISPATCH_LOCKED, /* on return, q is locked, continue on */
3728 FC_DISPATCH_UNLOCKED, /* on return, q is unlocked, continue on */
3729 };
3730
3731
3732 /**
3733 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3734 * @q: fc host request queue
3735 * @shost: scsi host rport attached to
3736 * @job: bsg job to be processed
3737 */
3738 static enum fc_dispatch_result
3739 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3740 struct fc_bsg_job *job)
3741 {
3742 struct fc_internal *i = to_fc_internal(shost->transportt);
3743 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3744 int ret;
3745
3746 /* Validate the host command */
3747 switch (job->request->msgcode) {
3748 case FC_BSG_HST_ADD_RPORT:
3749 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3750 break;
3751
3752 case FC_BSG_HST_DEL_RPORT:
3753 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3754 break;
3755
3756 case FC_BSG_HST_ELS_NOLOGIN:
3757 cmdlen += sizeof(struct fc_bsg_host_els);
3758 /* there better be a xmt and rcv payloads */
3759 if ((!job->request_payload.payload_len) ||
3760 (!job->reply_payload.payload_len)) {
3761 ret = -EINVAL;
3762 goto fail_host_msg;
3763 }
3764 break;
3765
3766 case FC_BSG_HST_CT:
3767 cmdlen += sizeof(struct fc_bsg_host_ct);
3768 /* there better be xmt and rcv payloads */
3769 if ((!job->request_payload.payload_len) ||
3770 (!job->reply_payload.payload_len)) {
3771 ret = -EINVAL;
3772 goto fail_host_msg;
3773 }
3774 break;
3775
3776 case FC_BSG_HST_VENDOR:
3777 cmdlen += sizeof(struct fc_bsg_host_vendor);
3778 if ((shost->hostt->vendor_id == 0L) ||
3779 (job->request->rqst_data.h_vendor.vendor_id !=
3780 shost->hostt->vendor_id)) {
3781 ret = -ESRCH;
3782 goto fail_host_msg;
3783 }
3784 break;
3785
3786 default:
3787 ret = -EBADR;
3788 goto fail_host_msg;
3789 }
3790
3791 /* check if we really have all the request data needed */
3792 if (job->request_len < cmdlen) {
3793 ret = -ENOMSG;
3794 goto fail_host_msg;
3795 }
3796
3797 ret = i->f->bsg_request(job);
3798 if (!ret)
3799 return FC_DISPATCH_UNLOCKED;
3800
3801 fail_host_msg:
3802 /* return the errno failure code as the only status */
3803 BUG_ON(job->reply_len < sizeof(uint32_t));
3804 job->reply->reply_payload_rcv_len = 0;
3805 job->reply->result = ret;
3806 job->reply_len = sizeof(uint32_t);
3807 fc_bsg_jobdone(job);
3808 return FC_DISPATCH_UNLOCKED;
3809 }
3810
3811
3812 /*
3813 * fc_bsg_goose_queue - restart rport queue in case it was stopped
3814 * @rport: rport to be restarted
3815 */
3816 static void
3817 fc_bsg_goose_queue(struct fc_rport *rport)
3818 {
3819 int flagset;
3820 unsigned long flags;
3821
3822 if (!rport->rqst_q)
3823 return;
3824
3825 get_device(&rport->dev);
3826
3827 spin_lock_irqsave(rport->rqst_q->queue_lock, flags);
3828 flagset = test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags) &&
3829 !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags);
3830 if (flagset)
3831 queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q);
3832 __blk_run_queue(rport->rqst_q, false);
3833 if (flagset)
3834 queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q);
3835 spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags);
3836
3837 put_device(&rport->dev);
3838 }
3839
3840
3841 /**
3842 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3843 * @q: rport request queue
3844 * @shost: scsi host rport attached to
3845 * @rport: rport request destined to
3846 * @job: bsg job to be processed
3847 */
3848 static enum fc_dispatch_result
3849 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3850 struct fc_rport *rport, struct fc_bsg_job *job)
3851 {
3852 struct fc_internal *i = to_fc_internal(shost->transportt);
3853 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3854 int ret;
3855
3856 /* Validate the rport command */
3857 switch (job->request->msgcode) {
3858 case FC_BSG_RPT_ELS:
3859 cmdlen += sizeof(struct fc_bsg_rport_els);
3860 goto check_bidi;
3861
3862 case FC_BSG_RPT_CT:
3863 cmdlen += sizeof(struct fc_bsg_rport_ct);
3864 check_bidi:
3865 /* there better be xmt and rcv payloads */
3866 if ((!job->request_payload.payload_len) ||
3867 (!job->reply_payload.payload_len)) {
3868 ret = -EINVAL;
3869 goto fail_rport_msg;
3870 }
3871 break;
3872 default:
3873 ret = -EBADR;
3874 goto fail_rport_msg;
3875 }
3876
3877 /* check if we really have all the request data needed */
3878 if (job->request_len < cmdlen) {
3879 ret = -ENOMSG;
3880 goto fail_rport_msg;
3881 }
3882
3883 ret = i->f->bsg_request(job);
3884 if (!ret)
3885 return FC_DISPATCH_UNLOCKED;
3886
3887 fail_rport_msg:
3888 /* return the errno failure code as the only status */
3889 BUG_ON(job->reply_len < sizeof(uint32_t));
3890 job->reply->reply_payload_rcv_len = 0;
3891 job->reply->result = ret;
3892 job->reply_len = sizeof(uint32_t);
3893 fc_bsg_jobdone(job);
3894 return FC_DISPATCH_UNLOCKED;
3895 }
3896
3897
3898 /**
3899 * fc_bsg_request_handler - generic handler for bsg requests
3900 * @q: request queue to manage
3901 * @shost: Scsi_Host related to the bsg object
3902 * @rport: FC remote port related to the bsg object (optional)
3903 * @dev: device structure for bsg object
3904 */
3905 static void
3906 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3907 struct fc_rport *rport, struct device *dev)
3908 {
3909 struct request *req;
3910 struct fc_bsg_job *job;
3911 enum fc_dispatch_result ret;
3912
3913 if (!get_device(dev))
3914 return;
3915
3916 while (!blk_queue_plugged(q)) {
3917 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
3918 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3919 break;
3920
3921 req = blk_fetch_request(q);
3922 if (!req)
3923 break;
3924
3925 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3926 req->errors = -ENXIO;
3927 spin_unlock_irq(q->queue_lock);
3928 blk_end_request_all(req, -ENXIO);
3929 spin_lock_irq(q->queue_lock);
3930 continue;
3931 }
3932
3933 spin_unlock_irq(q->queue_lock);
3934
3935 ret = fc_req_to_bsgjob(shost, rport, req);
3936 if (ret) {
3937 req->errors = ret;
3938 blk_end_request_all(req, ret);
3939 spin_lock_irq(q->queue_lock);
3940 continue;
3941 }
3942
3943 job = req->special;
3944
3945 /* check if we have the msgcode value at least */
3946 if (job->request_len < sizeof(uint32_t)) {
3947 BUG_ON(job->reply_len < sizeof(uint32_t));
3948 job->reply->reply_payload_rcv_len = 0;
3949 job->reply->result = -ENOMSG;
3950 job->reply_len = sizeof(uint32_t);
3951 fc_bsg_jobdone(job);
3952 spin_lock_irq(q->queue_lock);
3953 continue;
3954 }
3955
3956 /* the dispatch routines will unlock the queue_lock */
3957 if (rport)
3958 ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3959 else
3960 ret = fc_bsg_host_dispatch(q, shost, job);
3961
3962 /* did dispatcher hit state that can't process any more */
3963 if (ret == FC_DISPATCH_BREAK)
3964 break;
3965
3966 /* did dispatcher had released the lock */
3967 if (ret == FC_DISPATCH_UNLOCKED)
3968 spin_lock_irq(q->queue_lock);
3969 }
3970
3971 spin_unlock_irq(q->queue_lock);
3972 put_device(dev);
3973 spin_lock_irq(q->queue_lock);
3974 }
3975
3976
3977 /**
3978 * fc_bsg_host_handler - handler for bsg requests for a fc host
3979 * @q: fc host request queue
3980 */
3981 static void
3982 fc_bsg_host_handler(struct request_queue *q)
3983 {
3984 struct Scsi_Host *shost = q->queuedata;
3985
3986 fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
3987 }
3988
3989
3990 /**
3991 * fc_bsg_rport_handler - handler for bsg requests for a fc rport
3992 * @q: rport request queue
3993 */
3994 static void
3995 fc_bsg_rport_handler(struct request_queue *q)
3996 {
3997 struct fc_rport *rport = q->queuedata;
3998 struct Scsi_Host *shost = rport_to_shost(rport);
3999
4000 fc_bsg_request_handler(q, shost, rport, &rport->dev);
4001 }
4002
4003
4004 /**
4005 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
4006 * @shost: shost for fc_host
4007 * @fc_host: fc_host adding the structures to
4008 */
4009 static int
4010 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
4011 {
4012 struct device *dev = &shost->shost_gendev;
4013 struct fc_internal *i = to_fc_internal(shost->transportt);
4014 struct request_queue *q;
4015 int err;
4016 char bsg_name[20];
4017
4018 fc_host->rqst_q = NULL;
4019
4020 if (!i->f->bsg_request)
4021 return -ENOTSUPP;
4022
4023 snprintf(bsg_name, sizeof(bsg_name),
4024 "fc_host%d", shost->host_no);
4025
4026 q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
4027 if (!q) {
4028 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4029 "initialize - no request queue\n",
4030 shost->host_no);
4031 return -ENOMEM;
4032 }
4033
4034 q->queuedata = shost;
4035 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4036 blk_queue_softirq_done(q, fc_bsg_softirq_done);
4037 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4038 blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4039
4040 err = bsg_register_queue(q, dev, bsg_name, NULL);
4041 if (err) {
4042 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4043 "initialize - register queue\n",
4044 shost->host_no);
4045 blk_cleanup_queue(q);
4046 return err;
4047 }
4048
4049 fc_host->rqst_q = q;
4050 return 0;
4051 }
4052
4053
4054 /**
4055 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4056 * @shost: shost that rport is attached to
4057 * @rport: rport that the bsg hooks are being attached to
4058 */
4059 static int
4060 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4061 {
4062 struct device *dev = &rport->dev;
4063 struct fc_internal *i = to_fc_internal(shost->transportt);
4064 struct request_queue *q;
4065 int err;
4066
4067 rport->rqst_q = NULL;
4068
4069 if (!i->f->bsg_request)
4070 return -ENOTSUPP;
4071
4072 q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
4073 if (!q) {
4074 printk(KERN_ERR "%s: bsg interface failed to "
4075 "initialize - no request queue\n",
4076 dev->kobj.name);
4077 return -ENOMEM;
4078 }
4079
4080 q->queuedata = rport;
4081 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4082 blk_queue_softirq_done(q, fc_bsg_softirq_done);
4083 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4084 blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4085
4086 err = bsg_register_queue(q, dev, NULL, NULL);
4087 if (err) {
4088 printk(KERN_ERR "%s: bsg interface failed to "
4089 "initialize - register queue\n",
4090 dev->kobj.name);
4091 blk_cleanup_queue(q);
4092 return err;
4093 }
4094
4095 rport->rqst_q = q;
4096 return 0;
4097 }
4098
4099
4100 /**
4101 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4102 * @q: the request_queue that is to be torn down.
4103 *
4104 * Notes:
4105 * Before unregistering the queue empty any requests that are blocked
4106 *
4107 *
4108 */
4109 static void
4110 fc_bsg_remove(struct request_queue *q)
4111 {
4112 struct request *req; /* block request */
4113 int counts; /* totals for request_list count and starved */
4114
4115 if (q) {
4116 /* Stop taking in new requests */
4117 spin_lock_irq(q->queue_lock);
4118 blk_stop_queue(q);
4119
4120 /* drain all requests in the queue */
4121 while (1) {
4122 /* need the lock to fetch a request
4123 * this may fetch the same reqeust as the previous pass
4124 */
4125 req = blk_fetch_request(q);
4126 /* save requests in use and starved */
4127 counts = q->rq.count[0] + q->rq.count[1] +
4128 q->rq.starved[0] + q->rq.starved[1];
4129 spin_unlock_irq(q->queue_lock);
4130 /* any requests still outstanding? */
4131 if (counts == 0)
4132 break;
4133
4134 /* This may be the same req as the previous iteration,
4135 * always send the blk_end_request_all after a prefetch.
4136 * It is not okay to not end the request because the
4137 * prefetch started the request.
4138 */
4139 if (req) {
4140 /* return -ENXIO to indicate that this queue is
4141 * going away
4142 */
4143 req->errors = -ENXIO;
4144 blk_end_request_all(req, -ENXIO);
4145 }
4146
4147 msleep(200); /* allow bsg to possibly finish */
4148 spin_lock_irq(q->queue_lock);
4149 }
4150
4151 bsg_unregister_queue(q);
4152 blk_cleanup_queue(q);
4153 }
4154 }
4155
4156
4157 /* Original Author: Martin Hicks */
4158 MODULE_AUTHOR("James Smart");
4159 MODULE_DESCRIPTION("FC Transport Attributes");
4160 MODULE_LICENSE("GPL");
4161
4162 module_init(fc_transport_init);
4163 module_exit(fc_transport_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree