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Merge branch 'drbd-8.4_ed6' into for-3.8-drivers-drbd-8.4_ed6
[mirror_ubuntu-bionic-kernel.git] / drivers / scsi / scsi_transport_fc.c
1 /*
2 * FiberChannel transport specific attributes exported to sysfs.
3 *
4 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 * ========
21 *
22 * Copyright (C) 2004-2007 James Smart, Emulex Corporation
23 * Rewrite for host, target, device, and remote port attributes,
24 * statistics, and service functions...
25 * Add vports, etc
26 *
27 */
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/slab.h>
31 #include <linux/delay.h>
32 #include <linux/kernel.h>
33 #include <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 29
317
318 struct fc_internal {
319 struct scsi_transport_template t;
320 struct fc_function_template *f;
321
322 /*
323 * For attributes : each object has :
324 * An array of the actual attributes structures
325 * An array of null-terminated pointers to the attribute
326 * structures - used for mid-layer interaction.
327 *
328 * The attribute containers for the starget and host are are
329 * part of the midlayer. As the remote port is specific to the
330 * fc transport, we must provide the attribute container.
331 */
332 struct device_attribute private_starget_attrs[
333 FC_STARGET_NUM_ATTRS];
334 struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
335
336 struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
337 struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
338
339 struct transport_container rport_attr_cont;
340 struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
341 struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
342
343 struct transport_container vport_attr_cont;
344 struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
345 struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
346 };
347
348 #define to_fc_internal(tmpl) container_of(tmpl, struct fc_internal, t)
349
350 static int fc_target_setup(struct transport_container *tc, struct device *dev,
351 struct device *cdev)
352 {
353 struct scsi_target *starget = to_scsi_target(dev);
354 struct fc_rport *rport = starget_to_rport(starget);
355
356 /*
357 * if parent is remote port, use values from remote port.
358 * Otherwise, this host uses the fc_transport, but not the
359 * remote port interface. As such, initialize to known non-values.
360 */
361 if (rport) {
362 fc_starget_node_name(starget) = rport->node_name;
363 fc_starget_port_name(starget) = rport->port_name;
364 fc_starget_port_id(starget) = rport->port_id;
365 } else {
366 fc_starget_node_name(starget) = -1;
367 fc_starget_port_name(starget) = -1;
368 fc_starget_port_id(starget) = -1;
369 }
370
371 return 0;
372 }
373
374 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
375 "fc_transport",
376 fc_target_setup,
377 NULL,
378 NULL);
379
380 static int fc_host_setup(struct transport_container *tc, struct device *dev,
381 struct device *cdev)
382 {
383 struct Scsi_Host *shost = dev_to_shost(dev);
384 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
385
386 /*
387 * Set default values easily detected by the midlayer as
388 * failure cases. The scsi lldd is responsible for initializing
389 * all transport attributes to valid values per host.
390 */
391 fc_host->node_name = -1;
392 fc_host->port_name = -1;
393 fc_host->permanent_port_name = -1;
394 fc_host->supported_classes = FC_COS_UNSPECIFIED;
395 memset(fc_host->supported_fc4s, 0,
396 sizeof(fc_host->supported_fc4s));
397 fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
398 fc_host->maxframe_size = -1;
399 fc_host->max_npiv_vports = 0;
400 memset(fc_host->serial_number, 0,
401 sizeof(fc_host->serial_number));
402 memset(fc_host->manufacturer, 0,
403 sizeof(fc_host->manufacturer));
404 memset(fc_host->model, 0,
405 sizeof(fc_host->model));
406 memset(fc_host->model_description, 0,
407 sizeof(fc_host->model_description));
408 memset(fc_host->hardware_version, 0,
409 sizeof(fc_host->hardware_version));
410 memset(fc_host->driver_version, 0,
411 sizeof(fc_host->driver_version));
412 memset(fc_host->firmware_version, 0,
413 sizeof(fc_host->firmware_version));
414 memset(fc_host->optionrom_version, 0,
415 sizeof(fc_host->optionrom_version));
416
417 fc_host->port_id = -1;
418 fc_host->port_type = FC_PORTTYPE_UNKNOWN;
419 fc_host->port_state = FC_PORTSTATE_UNKNOWN;
420 memset(fc_host->active_fc4s, 0,
421 sizeof(fc_host->active_fc4s));
422 fc_host->speed = FC_PORTSPEED_UNKNOWN;
423 fc_host->fabric_name = -1;
424 memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
425 memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
426
427 fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
428
429 INIT_LIST_HEAD(&fc_host->rports);
430 INIT_LIST_HEAD(&fc_host->rport_bindings);
431 INIT_LIST_HEAD(&fc_host->vports);
432 fc_host->next_rport_number = 0;
433 fc_host->next_target_id = 0;
434 fc_host->next_vport_number = 0;
435 fc_host->npiv_vports_inuse = 0;
436
437 snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
438 "fc_wq_%d", shost->host_no);
439 fc_host->work_q = alloc_workqueue(fc_host->work_q_name, 0, 0);
440 if (!fc_host->work_q)
441 return -ENOMEM;
442
443 fc_host->dev_loss_tmo = fc_dev_loss_tmo;
444 snprintf(fc_host->devloss_work_q_name,
445 sizeof(fc_host->devloss_work_q_name),
446 "fc_dl_%d", shost->host_no);
447 fc_host->devloss_work_q =
448 alloc_workqueue(fc_host->devloss_work_q_name, 0, 0);
449 if (!fc_host->devloss_work_q) {
450 destroy_workqueue(fc_host->work_q);
451 fc_host->work_q = NULL;
452 return -ENOMEM;
453 }
454
455 fc_bsg_hostadd(shost, fc_host);
456 /* ignore any bsg add error - we just can't do sgio */
457
458 return 0;
459 }
460
461 static int fc_host_remove(struct transport_container *tc, struct device *dev,
462 struct device *cdev)
463 {
464 struct Scsi_Host *shost = dev_to_shost(dev);
465 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
466
467 fc_bsg_remove(fc_host->rqst_q);
468 return 0;
469 }
470
471 static DECLARE_TRANSPORT_CLASS(fc_host_class,
472 "fc_host",
473 fc_host_setup,
474 fc_host_remove,
475 NULL);
476
477 /*
478 * Setup and Remove actions for remote ports are handled
479 * in the service functions below.
480 */
481 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
482 "fc_remote_ports",
483 NULL,
484 NULL,
485 NULL);
486
487 /*
488 * Setup and Remove actions for virtual ports are handled
489 * in the service functions below.
490 */
491 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
492 "fc_vports",
493 NULL,
494 NULL,
495 NULL);
496
497 /*
498 * Netlink Infrastructure
499 */
500
501 static atomic_t fc_event_seq;
502
503 /**
504 * fc_get_event_number - Obtain the next sequential FC event number
505 *
506 * Notes:
507 * We could have inlined this, but it would have required fc_event_seq to
508 * be exposed. For now, live with the subroutine call.
509 * Atomic used to avoid lock/unlock...
510 */
511 u32
512 fc_get_event_number(void)
513 {
514 return atomic_add_return(1, &fc_event_seq);
515 }
516 EXPORT_SYMBOL(fc_get_event_number);
517
518
519 /**
520 * fc_host_post_event - called to post an even on an fc_host.
521 * @shost: host the event occurred on
522 * @event_number: fc event number obtained from get_fc_event_number()
523 * @event_code: fc_host event being posted
524 * @event_data: 32bits of data for the event being posted
525 *
526 * Notes:
527 * This routine assumes no locks are held on entry.
528 */
529 void
530 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
531 enum fc_host_event_code event_code, u32 event_data)
532 {
533 struct sk_buff *skb;
534 struct nlmsghdr *nlh;
535 struct fc_nl_event *event;
536 const char *name;
537 u32 len, skblen;
538 int err;
539
540 if (!scsi_nl_sock) {
541 err = -ENOENT;
542 goto send_fail;
543 }
544
545 len = FC_NL_MSGALIGN(sizeof(*event));
546 skblen = NLMSG_SPACE(len);
547
548 skb = alloc_skb(skblen, GFP_KERNEL);
549 if (!skb) {
550 err = -ENOBUFS;
551 goto send_fail;
552 }
553
554 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
555 skblen - sizeof(*nlh), 0);
556 if (!nlh) {
557 err = -ENOBUFS;
558 goto send_fail_skb;
559 }
560 event = NLMSG_DATA(nlh);
561
562 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
563 FC_NL_ASYNC_EVENT, len);
564 event->seconds = get_seconds();
565 event->vendor_id = 0;
566 event->host_no = shost->host_no;
567 event->event_datalen = sizeof(u32); /* bytes */
568 event->event_num = event_number;
569 event->event_code = event_code;
570 event->event_data = event_data;
571
572 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
573 GFP_KERNEL);
574 return;
575
576 send_fail_skb:
577 kfree_skb(skb);
578 send_fail:
579 name = get_fc_host_event_code_name(event_code);
580 printk(KERN_WARNING
581 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
582 __func__, shost->host_no,
583 (name) ? name : "<unknown>", event_data, err);
584 return;
585 }
586 EXPORT_SYMBOL(fc_host_post_event);
587
588
589 /**
590 * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
591 * @shost: host the event occurred on
592 * @event_number: fc event number obtained from get_fc_event_number()
593 * @data_len: amount, in bytes, of vendor unique data
594 * @data_buf: pointer to vendor unique data
595 * @vendor_id: Vendor id
596 *
597 * Notes:
598 * This routine assumes no locks are held on entry.
599 */
600 void
601 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
602 u32 data_len, char * data_buf, u64 vendor_id)
603 {
604 struct sk_buff *skb;
605 struct nlmsghdr *nlh;
606 struct fc_nl_event *event;
607 u32 len, skblen;
608 int err;
609
610 if (!scsi_nl_sock) {
611 err = -ENOENT;
612 goto send_vendor_fail;
613 }
614
615 len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
616 skblen = NLMSG_SPACE(len);
617
618 skb = alloc_skb(skblen, GFP_KERNEL);
619 if (!skb) {
620 err = -ENOBUFS;
621 goto send_vendor_fail;
622 }
623
624 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
625 skblen - sizeof(*nlh), 0);
626 if (!nlh) {
627 err = -ENOBUFS;
628 goto send_vendor_fail_skb;
629 }
630 event = NLMSG_DATA(nlh);
631
632 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
633 FC_NL_ASYNC_EVENT, len);
634 event->seconds = get_seconds();
635 event->vendor_id = vendor_id;
636 event->host_no = shost->host_no;
637 event->event_datalen = data_len; /* bytes */
638 event->event_num = event_number;
639 event->event_code = FCH_EVT_VENDOR_UNIQUE;
640 memcpy(&event->event_data, data_buf, data_len);
641
642 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
643 GFP_KERNEL);
644 return;
645
646 send_vendor_fail_skb:
647 kfree_skb(skb);
648 send_vendor_fail:
649 printk(KERN_WARNING
650 "%s: Dropped Event : host %d vendor_unique - err %d\n",
651 __func__, shost->host_no, err);
652 return;
653 }
654 EXPORT_SYMBOL(fc_host_post_vendor_event);
655
656
657
658 static __init int fc_transport_init(void)
659 {
660 int error;
661
662 atomic_set(&fc_event_seq, 0);
663
664 error = transport_class_register(&fc_host_class);
665 if (error)
666 return error;
667 error = transport_class_register(&fc_vport_class);
668 if (error)
669 goto unreg_host_class;
670 error = transport_class_register(&fc_rport_class);
671 if (error)
672 goto unreg_vport_class;
673 error = transport_class_register(&fc_transport_class);
674 if (error)
675 goto unreg_rport_class;
676 return 0;
677
678 unreg_rport_class:
679 transport_class_unregister(&fc_rport_class);
680 unreg_vport_class:
681 transport_class_unregister(&fc_vport_class);
682 unreg_host_class:
683 transport_class_unregister(&fc_host_class);
684 return error;
685 }
686
687 static void __exit fc_transport_exit(void)
688 {
689 transport_class_unregister(&fc_transport_class);
690 transport_class_unregister(&fc_rport_class);
691 transport_class_unregister(&fc_host_class);
692 transport_class_unregister(&fc_vport_class);
693 }
694
695 /*
696 * FC Remote Port Attribute Management
697 */
698
699 #define fc_rport_show_function(field, format_string, sz, cast) \
700 static ssize_t \
701 show_fc_rport_##field (struct device *dev, \
702 struct device_attribute *attr, char *buf) \
703 { \
704 struct fc_rport *rport = transport_class_to_rport(dev); \
705 struct Scsi_Host *shost = rport_to_shost(rport); \
706 struct fc_internal *i = to_fc_internal(shost->transportt); \
707 if ((i->f->get_rport_##field) && \
708 !((rport->port_state == FC_PORTSTATE_BLOCKED) || \
709 (rport->port_state == FC_PORTSTATE_DELETED) || \
710 (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
711 i->f->get_rport_##field(rport); \
712 return snprintf(buf, sz, format_string, cast rport->field); \
713 }
714
715 #define fc_rport_store_function(field) \
716 static ssize_t \
717 store_fc_rport_##field(struct device *dev, \
718 struct device_attribute *attr, \
719 const char *buf, size_t count) \
720 { \
721 int val; \
722 struct fc_rport *rport = transport_class_to_rport(dev); \
723 struct Scsi_Host *shost = rport_to_shost(rport); \
724 struct fc_internal *i = to_fc_internal(shost->transportt); \
725 char *cp; \
726 if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
727 (rport->port_state == FC_PORTSTATE_DELETED) || \
728 (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
729 return -EBUSY; \
730 val = simple_strtoul(buf, &cp, 0); \
731 if (*cp && (*cp != '\n')) \
732 return -EINVAL; \
733 i->f->set_rport_##field(rport, val); \
734 return count; \
735 }
736
737 #define fc_rport_rd_attr(field, format_string, sz) \
738 fc_rport_show_function(field, format_string, sz, ) \
739 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
740 show_fc_rport_##field, NULL)
741
742 #define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
743 fc_rport_show_function(field, format_string, sz, (cast)) \
744 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
745 show_fc_rport_##field, NULL)
746
747 #define fc_rport_rw_attr(field, format_string, sz) \
748 fc_rport_show_function(field, format_string, sz, ) \
749 fc_rport_store_function(field) \
750 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
751 show_fc_rport_##field, \
752 store_fc_rport_##field)
753
754
755 #define fc_private_rport_show_function(field, format_string, sz, cast) \
756 static ssize_t \
757 show_fc_rport_##field (struct device *dev, \
758 struct device_attribute *attr, char *buf) \
759 { \
760 struct fc_rport *rport = transport_class_to_rport(dev); \
761 return snprintf(buf, sz, format_string, cast rport->field); \
762 }
763
764 #define fc_private_rport_rd_attr(field, format_string, sz) \
765 fc_private_rport_show_function(field, format_string, sz, ) \
766 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
767 show_fc_rport_##field, NULL)
768
769 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
770 fc_private_rport_show_function(field, format_string, sz, (cast)) \
771 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
772 show_fc_rport_##field, NULL)
773
774
775 #define fc_private_rport_rd_enum_attr(title, maxlen) \
776 static ssize_t \
777 show_fc_rport_##title (struct device *dev, \
778 struct device_attribute *attr, char *buf) \
779 { \
780 struct fc_rport *rport = transport_class_to_rport(dev); \
781 const char *name; \
782 name = get_fc_##title##_name(rport->title); \
783 if (!name) \
784 return -EINVAL; \
785 return snprintf(buf, maxlen, "%s\n", name); \
786 } \
787 static FC_DEVICE_ATTR(rport, title, S_IRUGO, \
788 show_fc_rport_##title, NULL)
789
790
791 #define SETUP_RPORT_ATTRIBUTE_RD(field) \
792 i->private_rport_attrs[count] = device_attr_rport_##field; \
793 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
794 i->private_rport_attrs[count].store = NULL; \
795 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
796 if (i->f->show_rport_##field) \
797 count++
798
799 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
800 i->private_rport_attrs[count] = device_attr_rport_##field; \
801 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
802 i->private_rport_attrs[count].store = NULL; \
803 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
804 count++
805
806 #define SETUP_RPORT_ATTRIBUTE_RW(field) \
807 i->private_rport_attrs[count] = device_attr_rport_##field; \
808 if (!i->f->set_rport_##field) { \
809 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
810 i->private_rport_attrs[count].store = NULL; \
811 } \
812 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
813 if (i->f->show_rport_##field) \
814 count++
815
816 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
817 { \
818 i->private_rport_attrs[count] = device_attr_rport_##field; \
819 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
820 count++; \
821 }
822
823
824 /* The FC Transport Remote Port Attributes: */
825
826 /* Fixed Remote Port Attributes */
827
828 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
829
830 static ssize_t
831 show_fc_rport_supported_classes (struct device *dev,
832 struct device_attribute *attr, char *buf)
833 {
834 struct fc_rport *rport = transport_class_to_rport(dev);
835 if (rport->supported_classes == FC_COS_UNSPECIFIED)
836 return snprintf(buf, 20, "unspecified\n");
837 return get_fc_cos_names(rport->supported_classes, buf);
838 }
839 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
840 show_fc_rport_supported_classes, NULL);
841
842 /* Dynamic Remote Port Attributes */
843
844 /*
845 * dev_loss_tmo attribute
846 */
847 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
848 {
849 char *cp;
850
851 *val = simple_strtoul(buf, &cp, 0);
852 if ((*cp && (*cp != '\n')) || (*val < 0))
853 return -EINVAL;
854 /*
855 * Check for overflow; dev_loss_tmo is u32
856 */
857 if (*val > UINT_MAX)
858 return -EINVAL;
859
860 return 0;
861 }
862
863 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
864 unsigned long val)
865 {
866 struct Scsi_Host *shost = rport_to_shost(rport);
867 struct fc_internal *i = to_fc_internal(shost->transportt);
868
869 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
870 (rport->port_state == FC_PORTSTATE_DELETED) ||
871 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
872 return -EBUSY;
873 /*
874 * Check for overflow; dev_loss_tmo is u32
875 */
876 if (val > UINT_MAX)
877 return -EINVAL;
878
879 /*
880 * If fast_io_fail is off we have to cap
881 * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
882 */
883 if (rport->fast_io_fail_tmo == -1 &&
884 val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
885 return -EINVAL;
886
887 i->f->set_rport_dev_loss_tmo(rport, val);
888 return 0;
889 }
890
891 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
892 static ssize_t
893 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
894 const char *buf, size_t count)
895 {
896 struct fc_rport *rport = transport_class_to_rport(dev);
897 unsigned long val;
898 int rc;
899
900 rc = fc_str_to_dev_loss(buf, &val);
901 if (rc)
902 return rc;
903
904 rc = fc_rport_set_dev_loss_tmo(rport, val);
905 if (rc)
906 return rc;
907 return count;
908 }
909 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
910 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
911
912
913 /* Private Remote Port Attributes */
914
915 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
916 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
917 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
918
919 static ssize_t
920 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
921 char *buf)
922 {
923 struct fc_rport *rport = transport_class_to_rport(dev);
924
925 /* identify any roles that are port_id specific */
926 if ((rport->port_id != -1) &&
927 (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
928 FC_WELLKNOWN_PORTID_MASK) {
929 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
930 case FC_FPORT_PORTID:
931 return snprintf(buf, 30, "Fabric Port\n");
932 case FC_FABCTLR_PORTID:
933 return snprintf(buf, 30, "Fabric Controller\n");
934 case FC_DIRSRVR_PORTID:
935 return snprintf(buf, 30, "Directory Server\n");
936 case FC_TIMESRVR_PORTID:
937 return snprintf(buf, 30, "Time Server\n");
938 case FC_MGMTSRVR_PORTID:
939 return snprintf(buf, 30, "Management Server\n");
940 default:
941 return snprintf(buf, 30, "Unknown Fabric Entity\n");
942 }
943 } else {
944 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
945 return snprintf(buf, 20, "unknown\n");
946 return get_fc_port_roles_names(rport->roles, buf);
947 }
948 }
949 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
950 show_fc_rport_roles, NULL);
951
952 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
953 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
954
955 /*
956 * fast_io_fail_tmo attribute
957 */
958 static ssize_t
959 show_fc_rport_fast_io_fail_tmo (struct device *dev,
960 struct device_attribute *attr, char *buf)
961 {
962 struct fc_rport *rport = transport_class_to_rport(dev);
963
964 if (rport->fast_io_fail_tmo == -1)
965 return snprintf(buf, 5, "off\n");
966 return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
967 }
968
969 static ssize_t
970 store_fc_rport_fast_io_fail_tmo(struct device *dev,
971 struct device_attribute *attr, const char *buf,
972 size_t count)
973 {
974 int val;
975 char *cp;
976 struct fc_rport *rport = transport_class_to_rport(dev);
977
978 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
979 (rport->port_state == FC_PORTSTATE_DELETED) ||
980 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
981 return -EBUSY;
982 if (strncmp(buf, "off", 3) == 0)
983 rport->fast_io_fail_tmo = -1;
984 else {
985 val = simple_strtoul(buf, &cp, 0);
986 if ((*cp && (*cp != '\n')) || (val < 0))
987 return -EINVAL;
988 /*
989 * Cap fast_io_fail by dev_loss_tmo or
990 * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
991 */
992 if ((val >= rport->dev_loss_tmo) ||
993 (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
994 return -EINVAL;
995
996 rport->fast_io_fail_tmo = val;
997 }
998 return count;
999 }
1000 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
1001 show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
1002
1003
1004 /*
1005 * FC SCSI Target Attribute Management
1006 */
1007
1008 /*
1009 * Note: in the target show function we recognize when the remote
1010 * port is in the hierarchy and do not allow the driver to get
1011 * involved in sysfs functions. The driver only gets involved if
1012 * it's the "old" style that doesn't use rports.
1013 */
1014 #define fc_starget_show_function(field, format_string, sz, cast) \
1015 static ssize_t \
1016 show_fc_starget_##field (struct device *dev, \
1017 struct device_attribute *attr, char *buf) \
1018 { \
1019 struct scsi_target *starget = transport_class_to_starget(dev); \
1020 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
1021 struct fc_internal *i = to_fc_internal(shost->transportt); \
1022 struct fc_rport *rport = starget_to_rport(starget); \
1023 if (rport) \
1024 fc_starget_##field(starget) = rport->field; \
1025 else if (i->f->get_starget_##field) \
1026 i->f->get_starget_##field(starget); \
1027 return snprintf(buf, sz, format_string, \
1028 cast fc_starget_##field(starget)); \
1029 }
1030
1031 #define fc_starget_rd_attr(field, format_string, sz) \
1032 fc_starget_show_function(field, format_string, sz, ) \
1033 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1034 show_fc_starget_##field, NULL)
1035
1036 #define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
1037 fc_starget_show_function(field, format_string, sz, (cast)) \
1038 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1039 show_fc_starget_##field, NULL)
1040
1041 #define SETUP_STARGET_ATTRIBUTE_RD(field) \
1042 i->private_starget_attrs[count] = device_attr_starget_##field; \
1043 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1044 i->private_starget_attrs[count].store = NULL; \
1045 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1046 if (i->f->show_starget_##field) \
1047 count++
1048
1049 #define SETUP_STARGET_ATTRIBUTE_RW(field) \
1050 i->private_starget_attrs[count] = device_attr_starget_##field; \
1051 if (!i->f->set_starget_##field) { \
1052 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1053 i->private_starget_attrs[count].store = NULL; \
1054 } \
1055 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1056 if (i->f->show_starget_##field) \
1057 count++
1058
1059 /* The FC Transport SCSI Target Attributes: */
1060 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1061 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1062 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1063
1064
1065 /*
1066 * FC Virtual Port Attribute Management
1067 */
1068
1069 #define fc_vport_show_function(field, format_string, sz, cast) \
1070 static ssize_t \
1071 show_fc_vport_##field (struct device *dev, \
1072 struct device_attribute *attr, char *buf) \
1073 { \
1074 struct fc_vport *vport = transport_class_to_vport(dev); \
1075 struct Scsi_Host *shost = vport_to_shost(vport); \
1076 struct fc_internal *i = to_fc_internal(shost->transportt); \
1077 if ((i->f->get_vport_##field) && \
1078 !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))) \
1079 i->f->get_vport_##field(vport); \
1080 return snprintf(buf, sz, format_string, cast vport->field); \
1081 }
1082
1083 #define fc_vport_store_function(field) \
1084 static ssize_t \
1085 store_fc_vport_##field(struct device *dev, \
1086 struct device_attribute *attr, \
1087 const char *buf, size_t count) \
1088 { \
1089 int val; \
1090 struct fc_vport *vport = transport_class_to_vport(dev); \
1091 struct Scsi_Host *shost = vport_to_shost(vport); \
1092 struct fc_internal *i = to_fc_internal(shost->transportt); \
1093 char *cp; \
1094 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1095 return -EBUSY; \
1096 val = simple_strtoul(buf, &cp, 0); \
1097 if (*cp && (*cp != '\n')) \
1098 return -EINVAL; \
1099 i->f->set_vport_##field(vport, val); \
1100 return count; \
1101 }
1102
1103 #define fc_vport_store_str_function(field, slen) \
1104 static ssize_t \
1105 store_fc_vport_##field(struct device *dev, \
1106 struct device_attribute *attr, \
1107 const char *buf, size_t count) \
1108 { \
1109 struct fc_vport *vport = transport_class_to_vport(dev); \
1110 struct Scsi_Host *shost = vport_to_shost(vport); \
1111 struct fc_internal *i = to_fc_internal(shost->transportt); \
1112 unsigned int cnt=count; \
1113 \
1114 /* count may include a LF at end of string */ \
1115 if (buf[cnt-1] == '\n') \
1116 cnt--; \
1117 if (cnt > ((slen) - 1)) \
1118 return -EINVAL; \
1119 memcpy(vport->field, buf, cnt); \
1120 i->f->set_vport_##field(vport); \
1121 return count; \
1122 }
1123
1124 #define fc_vport_rd_attr(field, format_string, sz) \
1125 fc_vport_show_function(field, format_string, sz, ) \
1126 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1127 show_fc_vport_##field, NULL)
1128
1129 #define fc_vport_rd_attr_cast(field, format_string, sz, cast) \
1130 fc_vport_show_function(field, format_string, sz, (cast)) \
1131 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1132 show_fc_vport_##field, NULL)
1133
1134 #define fc_vport_rw_attr(field, format_string, sz) \
1135 fc_vport_show_function(field, format_string, sz, ) \
1136 fc_vport_store_function(field) \
1137 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1138 show_fc_vport_##field, \
1139 store_fc_vport_##field)
1140
1141 #define fc_private_vport_show_function(field, format_string, sz, cast) \
1142 static ssize_t \
1143 show_fc_vport_##field (struct device *dev, \
1144 struct device_attribute *attr, char *buf) \
1145 { \
1146 struct fc_vport *vport = transport_class_to_vport(dev); \
1147 return snprintf(buf, sz, format_string, cast vport->field); \
1148 }
1149
1150 #define fc_private_vport_store_u32_function(field) \
1151 static ssize_t \
1152 store_fc_vport_##field(struct device *dev, \
1153 struct device_attribute *attr, \
1154 const char *buf, size_t count) \
1155 { \
1156 u32 val; \
1157 struct fc_vport *vport = transport_class_to_vport(dev); \
1158 char *cp; \
1159 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1160 return -EBUSY; \
1161 val = simple_strtoul(buf, &cp, 0); \
1162 if (*cp && (*cp != '\n')) \
1163 return -EINVAL; \
1164 vport->field = val; \
1165 return count; \
1166 }
1167
1168
1169 #define fc_private_vport_rd_attr(field, format_string, sz) \
1170 fc_private_vport_show_function(field, format_string, sz, ) \
1171 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1172 show_fc_vport_##field, NULL)
1173
1174 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast) \
1175 fc_private_vport_show_function(field, format_string, sz, (cast)) \
1176 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1177 show_fc_vport_##field, NULL)
1178
1179 #define fc_private_vport_rw_u32_attr(field, format_string, sz) \
1180 fc_private_vport_show_function(field, format_string, sz, ) \
1181 fc_private_vport_store_u32_function(field) \
1182 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1183 show_fc_vport_##field, \
1184 store_fc_vport_##field)
1185
1186
1187 #define fc_private_vport_rd_enum_attr(title, maxlen) \
1188 static ssize_t \
1189 show_fc_vport_##title (struct device *dev, \
1190 struct device_attribute *attr, \
1191 char *buf) \
1192 { \
1193 struct fc_vport *vport = transport_class_to_vport(dev); \
1194 const char *name; \
1195 name = get_fc_##title##_name(vport->title); \
1196 if (!name) \
1197 return -EINVAL; \
1198 return snprintf(buf, maxlen, "%s\n", name); \
1199 } \
1200 static FC_DEVICE_ATTR(vport, title, S_IRUGO, \
1201 show_fc_vport_##title, NULL)
1202
1203
1204 #define SETUP_VPORT_ATTRIBUTE_RD(field) \
1205 i->private_vport_attrs[count] = device_attr_vport_##field; \
1206 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1207 i->private_vport_attrs[count].store = NULL; \
1208 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1209 if (i->f->get_##field) \
1210 count++
1211 /* NOTE: Above MACRO differs: checks function not show bit */
1212
1213 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field) \
1214 i->private_vport_attrs[count] = device_attr_vport_##field; \
1215 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1216 i->private_vport_attrs[count].store = NULL; \
1217 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1218 count++
1219
1220 #define SETUP_VPORT_ATTRIBUTE_WR(field) \
1221 i->private_vport_attrs[count] = device_attr_vport_##field; \
1222 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1223 if (i->f->field) \
1224 count++
1225 /* NOTE: Above MACRO differs: checks function */
1226
1227 #define SETUP_VPORT_ATTRIBUTE_RW(field) \
1228 i->private_vport_attrs[count] = device_attr_vport_##field; \
1229 if (!i->f->set_vport_##field) { \
1230 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1231 i->private_vport_attrs[count].store = NULL; \
1232 } \
1233 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1234 count++
1235 /* NOTE: Above MACRO differs: does not check show bit */
1236
1237 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field) \
1238 { \
1239 i->private_vport_attrs[count] = device_attr_vport_##field; \
1240 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1241 count++; \
1242 }
1243
1244
1245 /* The FC Transport Virtual Port Attributes: */
1246
1247 /* Fixed Virtual Port Attributes */
1248
1249 /* Dynamic Virtual Port Attributes */
1250
1251 /* Private Virtual Port Attributes */
1252
1253 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1254 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1255 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1256 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1257
1258 static ssize_t
1259 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1260 char *buf)
1261 {
1262 struct fc_vport *vport = transport_class_to_vport(dev);
1263
1264 if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1265 return snprintf(buf, 20, "unknown\n");
1266 return get_fc_port_roles_names(vport->roles, buf);
1267 }
1268 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1269
1270 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1271
1272 fc_private_vport_show_function(symbolic_name, "%s\n",
1273 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1274 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1275 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1276 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1277
1278 static ssize_t
1279 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1280 const char *buf, size_t count)
1281 {
1282 struct fc_vport *vport = transport_class_to_vport(dev);
1283 struct Scsi_Host *shost = vport_to_shost(vport);
1284 unsigned long flags;
1285
1286 spin_lock_irqsave(shost->host_lock, flags);
1287 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1288 spin_unlock_irqrestore(shost->host_lock, flags);
1289 return -EBUSY;
1290 }
1291 vport->flags |= FC_VPORT_DELETING;
1292 spin_unlock_irqrestore(shost->host_lock, flags);
1293
1294 fc_queue_work(shost, &vport->vport_delete_work);
1295 return count;
1296 }
1297 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1298 NULL, store_fc_vport_delete);
1299
1300
1301 /*
1302 * Enable/Disable vport
1303 * Write "1" to disable, write "0" to enable
1304 */
1305 static ssize_t
1306 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1307 const char *buf,
1308 size_t count)
1309 {
1310 struct fc_vport *vport = transport_class_to_vport(dev);
1311 struct Scsi_Host *shost = vport_to_shost(vport);
1312 struct fc_internal *i = to_fc_internal(shost->transportt);
1313 int stat;
1314
1315 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1316 return -EBUSY;
1317
1318 if (*buf == '0') {
1319 if (vport->vport_state != FC_VPORT_DISABLED)
1320 return -EALREADY;
1321 } else if (*buf == '1') {
1322 if (vport->vport_state == FC_VPORT_DISABLED)
1323 return -EALREADY;
1324 } else
1325 return -EINVAL;
1326
1327 stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1328 return stat ? stat : count;
1329 }
1330 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1331 NULL, store_fc_vport_disable);
1332
1333
1334 /*
1335 * Host Attribute Management
1336 */
1337
1338 #define fc_host_show_function(field, format_string, sz, cast) \
1339 static ssize_t \
1340 show_fc_host_##field (struct device *dev, \
1341 struct device_attribute *attr, char *buf) \
1342 { \
1343 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1344 struct fc_internal *i = to_fc_internal(shost->transportt); \
1345 if (i->f->get_host_##field) \
1346 i->f->get_host_##field(shost); \
1347 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1348 }
1349
1350 #define fc_host_store_function(field) \
1351 static ssize_t \
1352 store_fc_host_##field(struct device *dev, \
1353 struct device_attribute *attr, \
1354 const char *buf, size_t count) \
1355 { \
1356 int val; \
1357 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1358 struct fc_internal *i = to_fc_internal(shost->transportt); \
1359 char *cp; \
1360 \
1361 val = simple_strtoul(buf, &cp, 0); \
1362 if (*cp && (*cp != '\n')) \
1363 return -EINVAL; \
1364 i->f->set_host_##field(shost, val); \
1365 return count; \
1366 }
1367
1368 #define fc_host_store_str_function(field, slen) \
1369 static ssize_t \
1370 store_fc_host_##field(struct device *dev, \
1371 struct device_attribute *attr, \
1372 const char *buf, size_t count) \
1373 { \
1374 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1375 struct fc_internal *i = to_fc_internal(shost->transportt); \
1376 unsigned int cnt=count; \
1377 \
1378 /* count may include a LF at end of string */ \
1379 if (buf[cnt-1] == '\n') \
1380 cnt--; \
1381 if (cnt > ((slen) - 1)) \
1382 return -EINVAL; \
1383 memcpy(fc_host_##field(shost), buf, cnt); \
1384 i->f->set_host_##field(shost); \
1385 return count; \
1386 }
1387
1388 #define fc_host_rd_attr(field, format_string, sz) \
1389 fc_host_show_function(field, format_string, sz, ) \
1390 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1391 show_fc_host_##field, NULL)
1392
1393 #define fc_host_rd_attr_cast(field, format_string, sz, cast) \
1394 fc_host_show_function(field, format_string, sz, (cast)) \
1395 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1396 show_fc_host_##field, NULL)
1397
1398 #define fc_host_rw_attr(field, format_string, sz) \
1399 fc_host_show_function(field, format_string, sz, ) \
1400 fc_host_store_function(field) \
1401 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
1402 show_fc_host_##field, \
1403 store_fc_host_##field)
1404
1405 #define fc_host_rd_enum_attr(title, maxlen) \
1406 static ssize_t \
1407 show_fc_host_##title (struct device *dev, \
1408 struct device_attribute *attr, char *buf) \
1409 { \
1410 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1411 struct fc_internal *i = to_fc_internal(shost->transportt); \
1412 const char *name; \
1413 if (i->f->get_host_##title) \
1414 i->f->get_host_##title(shost); \
1415 name = get_fc_##title##_name(fc_host_##title(shost)); \
1416 if (!name) \
1417 return -EINVAL; \
1418 return snprintf(buf, maxlen, "%s\n", name); \
1419 } \
1420 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1421
1422 #define SETUP_HOST_ATTRIBUTE_RD(field) \
1423 i->private_host_attrs[count] = device_attr_host_##field; \
1424 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1425 i->private_host_attrs[count].store = NULL; \
1426 i->host_attrs[count] = &i->private_host_attrs[count]; \
1427 if (i->f->show_host_##field) \
1428 count++
1429
1430 #define SETUP_HOST_ATTRIBUTE_RD_NS(field) \
1431 i->private_host_attrs[count] = device_attr_host_##field; \
1432 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1433 i->private_host_attrs[count].store = NULL; \
1434 i->host_attrs[count] = &i->private_host_attrs[count]; \
1435 count++
1436
1437 #define SETUP_HOST_ATTRIBUTE_RW(field) \
1438 i->private_host_attrs[count] = device_attr_host_##field; \
1439 if (!i->f->set_host_##field) { \
1440 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1441 i->private_host_attrs[count].store = NULL; \
1442 } \
1443 i->host_attrs[count] = &i->private_host_attrs[count]; \
1444 if (i->f->show_host_##field) \
1445 count++
1446
1447
1448 #define fc_private_host_show_function(field, format_string, sz, cast) \
1449 static ssize_t \
1450 show_fc_host_##field (struct device *dev, \
1451 struct device_attribute *attr, char *buf) \
1452 { \
1453 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1454 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1455 }
1456
1457 #define fc_private_host_rd_attr(field, format_string, sz) \
1458 fc_private_host_show_function(field, format_string, sz, ) \
1459 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1460 show_fc_host_##field, NULL)
1461
1462 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
1463 fc_private_host_show_function(field, format_string, sz, (cast)) \
1464 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1465 show_fc_host_##field, NULL)
1466
1467 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
1468 i->private_host_attrs[count] = device_attr_host_##field; \
1469 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1470 i->private_host_attrs[count].store = NULL; \
1471 i->host_attrs[count] = &i->private_host_attrs[count]; \
1472 count++
1473
1474 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
1475 { \
1476 i->private_host_attrs[count] = device_attr_host_##field; \
1477 i->host_attrs[count] = &i->private_host_attrs[count]; \
1478 count++; \
1479 }
1480
1481
1482 /* Fixed Host Attributes */
1483
1484 static ssize_t
1485 show_fc_host_supported_classes (struct device *dev,
1486 struct device_attribute *attr, char *buf)
1487 {
1488 struct Scsi_Host *shost = transport_class_to_shost(dev);
1489
1490 if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1491 return snprintf(buf, 20, "unspecified\n");
1492
1493 return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1494 }
1495 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1496 show_fc_host_supported_classes, NULL);
1497
1498 static ssize_t
1499 show_fc_host_supported_fc4s (struct device *dev,
1500 struct device_attribute *attr, char *buf)
1501 {
1502 struct Scsi_Host *shost = transport_class_to_shost(dev);
1503 return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1504 }
1505 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1506 show_fc_host_supported_fc4s, NULL);
1507
1508 static ssize_t
1509 show_fc_host_supported_speeds (struct device *dev,
1510 struct device_attribute *attr, char *buf)
1511 {
1512 struct Scsi_Host *shost = transport_class_to_shost(dev);
1513
1514 if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1515 return snprintf(buf, 20, "unknown\n");
1516
1517 return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1518 }
1519 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1520 show_fc_host_supported_speeds, NULL);
1521
1522
1523 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1524 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1525 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1526 unsigned long long);
1527 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1528 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1529 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1530 fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
1531 fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1532 fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1533 fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1534 fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1535 fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1536 fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1537
1538
1539 /* Dynamic Host Attributes */
1540
1541 static ssize_t
1542 show_fc_host_active_fc4s (struct device *dev,
1543 struct device_attribute *attr, char *buf)
1544 {
1545 struct Scsi_Host *shost = transport_class_to_shost(dev);
1546 struct fc_internal *i = to_fc_internal(shost->transportt);
1547
1548 if (i->f->get_host_active_fc4s)
1549 i->f->get_host_active_fc4s(shost);
1550
1551 return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1552 }
1553 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1554 show_fc_host_active_fc4s, NULL);
1555
1556 static ssize_t
1557 show_fc_host_speed (struct device *dev,
1558 struct device_attribute *attr, char *buf)
1559 {
1560 struct Scsi_Host *shost = transport_class_to_shost(dev);
1561 struct fc_internal *i = to_fc_internal(shost->transportt);
1562
1563 if (i->f->get_host_speed)
1564 i->f->get_host_speed(shost);
1565
1566 if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1567 return snprintf(buf, 20, "unknown\n");
1568
1569 return get_fc_port_speed_names(fc_host_speed(shost), buf);
1570 }
1571 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1572 show_fc_host_speed, NULL);
1573
1574
1575 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1576 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1577 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1578 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1579 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1580
1581 fc_private_host_show_function(system_hostname, "%s\n",
1582 FC_SYMBOLIC_NAME_SIZE + 1, )
1583 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1584 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1585 show_fc_host_system_hostname, store_fc_host_system_hostname);
1586
1587
1588 /* Private Host Attributes */
1589
1590 static ssize_t
1591 show_fc_private_host_tgtid_bind_type(struct device *dev,
1592 struct device_attribute *attr, char *buf)
1593 {
1594 struct Scsi_Host *shost = transport_class_to_shost(dev);
1595 const char *name;
1596
1597 name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1598 if (!name)
1599 return -EINVAL;
1600 return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1601 }
1602
1603 #define get_list_head_entry(pos, head, member) \
1604 pos = list_entry((head)->next, typeof(*pos), member)
1605
1606 static ssize_t
1607 store_fc_private_host_tgtid_bind_type(struct device *dev,
1608 struct device_attribute *attr, const char *buf, size_t count)
1609 {
1610 struct Scsi_Host *shost = transport_class_to_shost(dev);
1611 struct fc_rport *rport;
1612 enum fc_tgtid_binding_type val;
1613 unsigned long flags;
1614
1615 if (get_fc_tgtid_bind_type_match(buf, &val))
1616 return -EINVAL;
1617
1618 /* if changing bind type, purge all unused consistent bindings */
1619 if (val != fc_host_tgtid_bind_type(shost)) {
1620 spin_lock_irqsave(shost->host_lock, flags);
1621 while (!list_empty(&fc_host_rport_bindings(shost))) {
1622 get_list_head_entry(rport,
1623 &fc_host_rport_bindings(shost), peers);
1624 list_del(&rport->peers);
1625 rport->port_state = FC_PORTSTATE_DELETED;
1626 fc_queue_work(shost, &rport->rport_delete_work);
1627 }
1628 spin_unlock_irqrestore(shost->host_lock, flags);
1629 }
1630
1631 fc_host_tgtid_bind_type(shost) = val;
1632 return count;
1633 }
1634
1635 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1636 show_fc_private_host_tgtid_bind_type,
1637 store_fc_private_host_tgtid_bind_type);
1638
1639 static ssize_t
1640 store_fc_private_host_issue_lip(struct device *dev,
1641 struct device_attribute *attr, const char *buf, size_t count)
1642 {
1643 struct Scsi_Host *shost = transport_class_to_shost(dev);
1644 struct fc_internal *i = to_fc_internal(shost->transportt);
1645 int ret;
1646
1647 /* ignore any data value written to the attribute */
1648 if (i->f->issue_fc_host_lip) {
1649 ret = i->f->issue_fc_host_lip(shost);
1650 return ret ? ret: count;
1651 }
1652
1653 return -ENOENT;
1654 }
1655
1656 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1657 store_fc_private_host_issue_lip);
1658
1659 static ssize_t
1660 store_fc_private_host_dev_loss_tmo(struct device *dev,
1661 struct device_attribute *attr,
1662 const char *buf, size_t count)
1663 {
1664 struct Scsi_Host *shost = transport_class_to_shost(dev);
1665 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1666 struct fc_rport *rport;
1667 unsigned long val, flags;
1668 int rc;
1669
1670 rc = fc_str_to_dev_loss(buf, &val);
1671 if (rc)
1672 return rc;
1673
1674 fc_host_dev_loss_tmo(shost) = val;
1675 spin_lock_irqsave(shost->host_lock, flags);
1676 list_for_each_entry(rport, &fc_host->rports, peers)
1677 fc_rport_set_dev_loss_tmo(rport, val);
1678 spin_unlock_irqrestore(shost->host_lock, flags);
1679 return count;
1680 }
1681
1682 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
1683 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
1684 show_fc_host_dev_loss_tmo,
1685 store_fc_private_host_dev_loss_tmo);
1686
1687 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1688
1689 /*
1690 * Host Statistics Management
1691 */
1692
1693 /* Show a given an attribute in the statistics group */
1694 static ssize_t
1695 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1696 {
1697 struct Scsi_Host *shost = transport_class_to_shost(dev);
1698 struct fc_internal *i = to_fc_internal(shost->transportt);
1699 struct fc_host_statistics *stats;
1700 ssize_t ret = -ENOENT;
1701
1702 if (offset > sizeof(struct fc_host_statistics) ||
1703 offset % sizeof(u64) != 0)
1704 WARN_ON(1);
1705
1706 if (i->f->get_fc_host_stats) {
1707 stats = (i->f->get_fc_host_stats)(shost);
1708 if (stats)
1709 ret = snprintf(buf, 20, "0x%llx\n",
1710 (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1711 }
1712 return ret;
1713 }
1714
1715
1716 /* generate a read-only statistics attribute */
1717 #define fc_host_statistic(name) \
1718 static ssize_t show_fcstat_##name(struct device *cd, \
1719 struct device_attribute *attr, \
1720 char *buf) \
1721 { \
1722 return fc_stat_show(cd, buf, \
1723 offsetof(struct fc_host_statistics, name)); \
1724 } \
1725 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1726
1727 fc_host_statistic(seconds_since_last_reset);
1728 fc_host_statistic(tx_frames);
1729 fc_host_statistic(tx_words);
1730 fc_host_statistic(rx_frames);
1731 fc_host_statistic(rx_words);
1732 fc_host_statistic(lip_count);
1733 fc_host_statistic(nos_count);
1734 fc_host_statistic(error_frames);
1735 fc_host_statistic(dumped_frames);
1736 fc_host_statistic(link_failure_count);
1737 fc_host_statistic(loss_of_sync_count);
1738 fc_host_statistic(loss_of_signal_count);
1739 fc_host_statistic(prim_seq_protocol_err_count);
1740 fc_host_statistic(invalid_tx_word_count);
1741 fc_host_statistic(invalid_crc_count);
1742 fc_host_statistic(fcp_input_requests);
1743 fc_host_statistic(fcp_output_requests);
1744 fc_host_statistic(fcp_control_requests);
1745 fc_host_statistic(fcp_input_megabytes);
1746 fc_host_statistic(fcp_output_megabytes);
1747 fc_host_statistic(fcp_packet_alloc_failures);
1748 fc_host_statistic(fcp_packet_aborts);
1749 fc_host_statistic(fcp_frame_alloc_failures);
1750 fc_host_statistic(fc_no_free_exch);
1751 fc_host_statistic(fc_no_free_exch_xid);
1752 fc_host_statistic(fc_xid_not_found);
1753 fc_host_statistic(fc_xid_busy);
1754 fc_host_statistic(fc_seq_not_found);
1755 fc_host_statistic(fc_non_bls_resp);
1756
1757 static ssize_t
1758 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1759 const char *buf, size_t count)
1760 {
1761 struct Scsi_Host *shost = transport_class_to_shost(dev);
1762 struct fc_internal *i = to_fc_internal(shost->transportt);
1763
1764 /* ignore any data value written to the attribute */
1765 if (i->f->reset_fc_host_stats) {
1766 i->f->reset_fc_host_stats(shost);
1767 return count;
1768 }
1769
1770 return -ENOENT;
1771 }
1772 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1773 fc_reset_statistics);
1774
1775 static struct attribute *fc_statistics_attrs[] = {
1776 &device_attr_host_seconds_since_last_reset.attr,
1777 &device_attr_host_tx_frames.attr,
1778 &device_attr_host_tx_words.attr,
1779 &device_attr_host_rx_frames.attr,
1780 &device_attr_host_rx_words.attr,
1781 &device_attr_host_lip_count.attr,
1782 &device_attr_host_nos_count.attr,
1783 &device_attr_host_error_frames.attr,
1784 &device_attr_host_dumped_frames.attr,
1785 &device_attr_host_link_failure_count.attr,
1786 &device_attr_host_loss_of_sync_count.attr,
1787 &device_attr_host_loss_of_signal_count.attr,
1788 &device_attr_host_prim_seq_protocol_err_count.attr,
1789 &device_attr_host_invalid_tx_word_count.attr,
1790 &device_attr_host_invalid_crc_count.attr,
1791 &device_attr_host_fcp_input_requests.attr,
1792 &device_attr_host_fcp_output_requests.attr,
1793 &device_attr_host_fcp_control_requests.attr,
1794 &device_attr_host_fcp_input_megabytes.attr,
1795 &device_attr_host_fcp_output_megabytes.attr,
1796 &device_attr_host_fcp_packet_alloc_failures.attr,
1797 &device_attr_host_fcp_packet_aborts.attr,
1798 &device_attr_host_fcp_frame_alloc_failures.attr,
1799 &device_attr_host_fc_no_free_exch.attr,
1800 &device_attr_host_fc_no_free_exch_xid.attr,
1801 &device_attr_host_fc_xid_not_found.attr,
1802 &device_attr_host_fc_xid_busy.attr,
1803 &device_attr_host_fc_seq_not_found.attr,
1804 &device_attr_host_fc_non_bls_resp.attr,
1805 &device_attr_host_reset_statistics.attr,
1806 NULL
1807 };
1808
1809 static struct attribute_group fc_statistics_group = {
1810 .name = "statistics",
1811 .attrs = fc_statistics_attrs,
1812 };
1813
1814
1815 /* Host Vport Attributes */
1816
1817 static int
1818 fc_parse_wwn(const char *ns, u64 *nm)
1819 {
1820 unsigned int i, j;
1821 u8 wwn[8];
1822
1823 memset(wwn, 0, sizeof(wwn));
1824
1825 /* Validate and store the new name */
1826 for (i=0, j=0; i < 16; i++) {
1827 int value;
1828
1829 value = hex_to_bin(*ns++);
1830 if (value >= 0)
1831 j = (j << 4) | value;
1832 else
1833 return -EINVAL;
1834 if (i % 2) {
1835 wwn[i/2] = j & 0xff;
1836 j = 0;
1837 }
1838 }
1839
1840 *nm = wwn_to_u64(wwn);
1841
1842 return 0;
1843 }
1844
1845
1846 /*
1847 * "Short-cut" sysfs variable to create a new vport on a FC Host.
1848 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1849 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1850 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1851 */
1852 static ssize_t
1853 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1854 const char *buf, size_t count)
1855 {
1856 struct Scsi_Host *shost = transport_class_to_shost(dev);
1857 struct fc_vport_identifiers vid;
1858 struct fc_vport *vport;
1859 unsigned int cnt=count;
1860 int stat;
1861
1862 memset(&vid, 0, sizeof(vid));
1863
1864 /* count may include a LF at end of string */
1865 if (buf[cnt-1] == '\n')
1866 cnt--;
1867
1868 /* validate we have enough characters for WWPN */
1869 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1870 return -EINVAL;
1871
1872 stat = fc_parse_wwn(&buf[0], &vid.port_name);
1873 if (stat)
1874 return stat;
1875
1876 stat = fc_parse_wwn(&buf[17], &vid.node_name);
1877 if (stat)
1878 return stat;
1879
1880 vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1881 vid.vport_type = FC_PORTTYPE_NPIV;
1882 /* vid.symbolic_name is already zero/NULL's */
1883 vid.disable = false; /* always enabled */
1884
1885 /* we only allow support on Channel 0 !!! */
1886 stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1887 return stat ? stat : count;
1888 }
1889 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1890 store_fc_host_vport_create);
1891
1892
1893 /*
1894 * "Short-cut" sysfs variable to delete a vport on a FC Host.
1895 * Vport is identified by a string containing "<WWPN>:<WWNN>".
1896 * The WWNs are specified as hex characters, and may *not* contain
1897 * any prefixes (e.g. 0x, x, etc)
1898 */
1899 static ssize_t
1900 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1901 const char *buf, size_t count)
1902 {
1903 struct Scsi_Host *shost = transport_class_to_shost(dev);
1904 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1905 struct fc_vport *vport;
1906 u64 wwpn, wwnn;
1907 unsigned long flags;
1908 unsigned int cnt=count;
1909 int stat, match;
1910
1911 /* count may include a LF at end of string */
1912 if (buf[cnt-1] == '\n')
1913 cnt--;
1914
1915 /* validate we have enough characters for WWPN */
1916 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1917 return -EINVAL;
1918
1919 stat = fc_parse_wwn(&buf[0], &wwpn);
1920 if (stat)
1921 return stat;
1922
1923 stat = fc_parse_wwn(&buf[17], &wwnn);
1924 if (stat)
1925 return stat;
1926
1927 spin_lock_irqsave(shost->host_lock, flags);
1928 match = 0;
1929 /* we only allow support on Channel 0 !!! */
1930 list_for_each_entry(vport, &fc_host->vports, peers) {
1931 if ((vport->channel == 0) &&
1932 (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1933 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1934 break;
1935 vport->flags |= FC_VPORT_DELETING;
1936 match = 1;
1937 break;
1938 }
1939 }
1940 spin_unlock_irqrestore(shost->host_lock, flags);
1941
1942 if (!match)
1943 return -ENODEV;
1944
1945 stat = fc_vport_terminate(vport);
1946 return stat ? stat : count;
1947 }
1948 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1949 store_fc_host_vport_delete);
1950
1951
1952 static int fc_host_match(struct attribute_container *cont,
1953 struct device *dev)
1954 {
1955 struct Scsi_Host *shost;
1956 struct fc_internal *i;
1957
1958 if (!scsi_is_host_device(dev))
1959 return 0;
1960
1961 shost = dev_to_shost(dev);
1962 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1963 != &fc_host_class.class)
1964 return 0;
1965
1966 i = to_fc_internal(shost->transportt);
1967
1968 return &i->t.host_attrs.ac == cont;
1969 }
1970
1971 static int fc_target_match(struct attribute_container *cont,
1972 struct device *dev)
1973 {
1974 struct Scsi_Host *shost;
1975 struct fc_internal *i;
1976
1977 if (!scsi_is_target_device(dev))
1978 return 0;
1979
1980 shost = dev_to_shost(dev->parent);
1981 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1982 != &fc_host_class.class)
1983 return 0;
1984
1985 i = to_fc_internal(shost->transportt);
1986
1987 return &i->t.target_attrs.ac == cont;
1988 }
1989
1990 static void fc_rport_dev_release(struct device *dev)
1991 {
1992 struct fc_rport *rport = dev_to_rport(dev);
1993 put_device(dev->parent);
1994 kfree(rport);
1995 }
1996
1997 int scsi_is_fc_rport(const struct device *dev)
1998 {
1999 return dev->release == fc_rport_dev_release;
2000 }
2001 EXPORT_SYMBOL(scsi_is_fc_rport);
2002
2003 static int fc_rport_match(struct attribute_container *cont,
2004 struct device *dev)
2005 {
2006 struct Scsi_Host *shost;
2007 struct fc_internal *i;
2008
2009 if (!scsi_is_fc_rport(dev))
2010 return 0;
2011
2012 shost = dev_to_shost(dev->parent);
2013 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2014 != &fc_host_class.class)
2015 return 0;
2016
2017 i = to_fc_internal(shost->transportt);
2018
2019 return &i->rport_attr_cont.ac == cont;
2020 }
2021
2022
2023 static void fc_vport_dev_release(struct device *dev)
2024 {
2025 struct fc_vport *vport = dev_to_vport(dev);
2026 put_device(dev->parent); /* release kobj parent */
2027 kfree(vport);
2028 }
2029
2030 int scsi_is_fc_vport(const struct device *dev)
2031 {
2032 return dev->release == fc_vport_dev_release;
2033 }
2034 EXPORT_SYMBOL(scsi_is_fc_vport);
2035
2036 static int fc_vport_match(struct attribute_container *cont,
2037 struct device *dev)
2038 {
2039 struct fc_vport *vport;
2040 struct Scsi_Host *shost;
2041 struct fc_internal *i;
2042
2043 if (!scsi_is_fc_vport(dev))
2044 return 0;
2045 vport = dev_to_vport(dev);
2046
2047 shost = vport_to_shost(vport);
2048 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2049 != &fc_host_class.class)
2050 return 0;
2051
2052 i = to_fc_internal(shost->transportt);
2053 return &i->vport_attr_cont.ac == cont;
2054 }
2055
2056
2057 /**
2058 * fc_timed_out - FC Transport I/O timeout intercept handler
2059 * @scmd: The SCSI command which timed out
2060 *
2061 * This routine protects against error handlers getting invoked while a
2062 * rport is in a blocked state, typically due to a temporarily loss of
2063 * connectivity. If the error handlers are allowed to proceed, requests
2064 * to abort i/o, reset the target, etc will likely fail as there is no way
2065 * to communicate with the device to perform the requested function. These
2066 * failures may result in the midlayer taking the device offline, requiring
2067 * manual intervention to restore operation.
2068 *
2069 * This routine, called whenever an i/o times out, validates the state of
2070 * the underlying rport. If the rport is blocked, it returns
2071 * EH_RESET_TIMER, which will continue to reschedule the timeout.
2072 * Eventually, either the device will return, or devloss_tmo will fire,
2073 * and when the timeout then fires, it will be handled normally.
2074 * If the rport is not blocked, normal error handling continues.
2075 *
2076 * Notes:
2077 * This routine assumes no locks are held on entry.
2078 */
2079 static enum blk_eh_timer_return
2080 fc_timed_out(struct scsi_cmnd *scmd)
2081 {
2082 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2083
2084 if (rport->port_state == FC_PORTSTATE_BLOCKED)
2085 return BLK_EH_RESET_TIMER;
2086
2087 return BLK_EH_NOT_HANDLED;
2088 }
2089
2090 /*
2091 * Called by fc_user_scan to locate an rport on the shost that
2092 * matches the channel and target id, and invoke scsi_scan_target()
2093 * on the rport.
2094 */
2095 static void
2096 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2097 {
2098 struct fc_rport *rport;
2099 unsigned long flags;
2100
2101 spin_lock_irqsave(shost->host_lock, flags);
2102
2103 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2104 if (rport->scsi_target_id == -1)
2105 continue;
2106
2107 if (rport->port_state != FC_PORTSTATE_ONLINE)
2108 continue;
2109
2110 if ((channel == rport->channel) &&
2111 (id == rport->scsi_target_id)) {
2112 spin_unlock_irqrestore(shost->host_lock, flags);
2113 scsi_scan_target(&rport->dev, channel, id, lun, 1);
2114 return;
2115 }
2116 }
2117
2118 spin_unlock_irqrestore(shost->host_lock, flags);
2119 }
2120
2121 /*
2122 * Called via sysfs scan routines. Necessary, as the FC transport
2123 * wants to place all target objects below the rport object. So this
2124 * routine must invoke the scsi_scan_target() routine with the rport
2125 * object as the parent.
2126 */
2127 static int
2128 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2129 {
2130 uint chlo, chhi;
2131 uint tgtlo, tgthi;
2132
2133 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2134 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2135 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2136 return -EINVAL;
2137
2138 if (channel == SCAN_WILD_CARD) {
2139 chlo = 0;
2140 chhi = shost->max_channel + 1;
2141 } else {
2142 chlo = channel;
2143 chhi = channel + 1;
2144 }
2145
2146 if (id == SCAN_WILD_CARD) {
2147 tgtlo = 0;
2148 tgthi = shost->max_id;
2149 } else {
2150 tgtlo = id;
2151 tgthi = id + 1;
2152 }
2153
2154 for ( ; chlo < chhi; chlo++)
2155 for ( ; tgtlo < tgthi; tgtlo++)
2156 fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2157
2158 return 0;
2159 }
2160
2161 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2162 int result)
2163 {
2164 struct fc_internal *i = to_fc_internal(shost->transportt);
2165 return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2166 }
2167
2168 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2169 {
2170 struct fc_internal *i = to_fc_internal(shost->transportt);
2171 return i->f->it_nexus_response(shost, nexus, result);
2172 }
2173
2174 struct scsi_transport_template *
2175 fc_attach_transport(struct fc_function_template *ft)
2176 {
2177 int count;
2178 struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2179 GFP_KERNEL);
2180
2181 if (unlikely(!i))
2182 return NULL;
2183
2184 i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2185 i->t.target_attrs.ac.class = &fc_transport_class.class;
2186 i->t.target_attrs.ac.match = fc_target_match;
2187 i->t.target_size = sizeof(struct fc_starget_attrs);
2188 transport_container_register(&i->t.target_attrs);
2189
2190 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2191 i->t.host_attrs.ac.class = &fc_host_class.class;
2192 i->t.host_attrs.ac.match = fc_host_match;
2193 i->t.host_size = sizeof(struct fc_host_attrs);
2194 if (ft->get_fc_host_stats)
2195 i->t.host_attrs.statistics = &fc_statistics_group;
2196 transport_container_register(&i->t.host_attrs);
2197
2198 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2199 i->rport_attr_cont.ac.class = &fc_rport_class.class;
2200 i->rport_attr_cont.ac.match = fc_rport_match;
2201 transport_container_register(&i->rport_attr_cont);
2202
2203 i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2204 i->vport_attr_cont.ac.class = &fc_vport_class.class;
2205 i->vport_attr_cont.ac.match = fc_vport_match;
2206 transport_container_register(&i->vport_attr_cont);
2207
2208 i->f = ft;
2209
2210 /* Transport uses the shost workq for scsi scanning */
2211 i->t.create_work_queue = 1;
2212
2213 i->t.eh_timed_out = fc_timed_out;
2214
2215 i->t.user_scan = fc_user_scan;
2216
2217 /* target-mode drivers' functions */
2218 i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2219 i->t.it_nexus_response = fc_it_nexus_response;
2220
2221 /*
2222 * Setup SCSI Target Attributes.
2223 */
2224 count = 0;
2225 SETUP_STARGET_ATTRIBUTE_RD(node_name);
2226 SETUP_STARGET_ATTRIBUTE_RD(port_name);
2227 SETUP_STARGET_ATTRIBUTE_RD(port_id);
2228
2229 BUG_ON(count > FC_STARGET_NUM_ATTRS);
2230
2231 i->starget_attrs[count] = NULL;
2232
2233
2234 /*
2235 * Setup SCSI Host Attributes.
2236 */
2237 count=0;
2238 SETUP_HOST_ATTRIBUTE_RD(node_name);
2239 SETUP_HOST_ATTRIBUTE_RD(port_name);
2240 SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2241 SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2242 SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2243 SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2244 SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2245 if (ft->vport_create) {
2246 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2247 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2248 }
2249 SETUP_HOST_ATTRIBUTE_RD(serial_number);
2250 SETUP_HOST_ATTRIBUTE_RD(manufacturer);
2251 SETUP_HOST_ATTRIBUTE_RD(model);
2252 SETUP_HOST_ATTRIBUTE_RD(model_description);
2253 SETUP_HOST_ATTRIBUTE_RD(hardware_version);
2254 SETUP_HOST_ATTRIBUTE_RD(driver_version);
2255 SETUP_HOST_ATTRIBUTE_RD(firmware_version);
2256 SETUP_HOST_ATTRIBUTE_RD(optionrom_version);
2257
2258 SETUP_HOST_ATTRIBUTE_RD(port_id);
2259 SETUP_HOST_ATTRIBUTE_RD(port_type);
2260 SETUP_HOST_ATTRIBUTE_RD(port_state);
2261 SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2262 SETUP_HOST_ATTRIBUTE_RD(speed);
2263 SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2264 SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2265 SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2266
2267 /* Transport-managed attributes */
2268 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2269 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2270 if (ft->issue_fc_host_lip)
2271 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2272 if (ft->vport_create)
2273 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2274 if (ft->vport_delete)
2275 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2276
2277 BUG_ON(count > FC_HOST_NUM_ATTRS);
2278
2279 i->host_attrs[count] = NULL;
2280
2281 /*
2282 * Setup Remote Port Attributes.
2283 */
2284 count=0;
2285 SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2286 SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2287 SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2288 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2289 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2290 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2291 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2292 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2293 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2294 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2295
2296 BUG_ON(count > FC_RPORT_NUM_ATTRS);
2297
2298 i->rport_attrs[count] = NULL;
2299
2300 /*
2301 * Setup Virtual Port Attributes.
2302 */
2303 count=0;
2304 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2305 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2306 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2307 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2308 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2309 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2310 SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2311 SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2312 SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2313
2314 BUG_ON(count > FC_VPORT_NUM_ATTRS);
2315
2316 i->vport_attrs[count] = NULL;
2317
2318 return &i->t;
2319 }
2320 EXPORT_SYMBOL(fc_attach_transport);
2321
2322 void fc_release_transport(struct scsi_transport_template *t)
2323 {
2324 struct fc_internal *i = to_fc_internal(t);
2325
2326 transport_container_unregister(&i->t.target_attrs);
2327 transport_container_unregister(&i->t.host_attrs);
2328 transport_container_unregister(&i->rport_attr_cont);
2329 transport_container_unregister(&i->vport_attr_cont);
2330
2331 kfree(i);
2332 }
2333 EXPORT_SYMBOL(fc_release_transport);
2334
2335 /**
2336 * fc_queue_work - Queue work to the fc_host workqueue.
2337 * @shost: Pointer to Scsi_Host bound to fc_host.
2338 * @work: Work to queue for execution.
2339 *
2340 * Return value:
2341 * 1 - work queued for execution
2342 * 0 - work is already queued
2343 * -EINVAL - work queue doesn't exist
2344 */
2345 static int
2346 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2347 {
2348 if (unlikely(!fc_host_work_q(shost))) {
2349 printk(KERN_ERR
2350 "ERROR: FC host '%s' attempted to queue work, "
2351 "when no workqueue created.\n", shost->hostt->name);
2352 dump_stack();
2353
2354 return -EINVAL;
2355 }
2356
2357 return queue_work(fc_host_work_q(shost), work);
2358 }
2359
2360 /**
2361 * fc_flush_work - Flush a fc_host's workqueue.
2362 * @shost: Pointer to Scsi_Host bound to fc_host.
2363 */
2364 static void
2365 fc_flush_work(struct Scsi_Host *shost)
2366 {
2367 if (!fc_host_work_q(shost)) {
2368 printk(KERN_ERR
2369 "ERROR: FC host '%s' attempted to flush work, "
2370 "when no workqueue created.\n", shost->hostt->name);
2371 dump_stack();
2372 return;
2373 }
2374
2375 flush_workqueue(fc_host_work_q(shost));
2376 }
2377
2378 /**
2379 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2380 * @shost: Pointer to Scsi_Host bound to fc_host.
2381 * @work: Work to queue for execution.
2382 * @delay: jiffies to delay the work queuing
2383 *
2384 * Return value:
2385 * 1 on success / 0 already queued / < 0 for error
2386 */
2387 static int
2388 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2389 unsigned long delay)
2390 {
2391 if (unlikely(!fc_host_devloss_work_q(shost))) {
2392 printk(KERN_ERR
2393 "ERROR: FC host '%s' attempted to queue work, "
2394 "when no workqueue created.\n", shost->hostt->name);
2395 dump_stack();
2396
2397 return -EINVAL;
2398 }
2399
2400 return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2401 }
2402
2403 /**
2404 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2405 * @shost: Pointer to Scsi_Host bound to fc_host.
2406 */
2407 static void
2408 fc_flush_devloss(struct Scsi_Host *shost)
2409 {
2410 if (!fc_host_devloss_work_q(shost)) {
2411 printk(KERN_ERR
2412 "ERROR: FC host '%s' attempted to flush work, "
2413 "when no workqueue created.\n", shost->hostt->name);
2414 dump_stack();
2415 return;
2416 }
2417
2418 flush_workqueue(fc_host_devloss_work_q(shost));
2419 }
2420
2421
2422 /**
2423 * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2424 * @shost: Which &Scsi_Host
2425 *
2426 * This routine is expected to be called immediately preceding the
2427 * a driver's call to scsi_remove_host().
2428 *
2429 * WARNING: A driver utilizing the fc_transport, which fails to call
2430 * this routine prior to scsi_remove_host(), will leave dangling
2431 * objects in /sys/class/fc_remote_ports. Access to any of these
2432 * objects can result in a system crash !!!
2433 *
2434 * Notes:
2435 * This routine assumes no locks are held on entry.
2436 */
2437 void
2438 fc_remove_host(struct Scsi_Host *shost)
2439 {
2440 struct fc_vport *vport = NULL, *next_vport = NULL;
2441 struct fc_rport *rport = NULL, *next_rport = NULL;
2442 struct workqueue_struct *work_q;
2443 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2444 unsigned long flags;
2445
2446 spin_lock_irqsave(shost->host_lock, flags);
2447
2448 /* Remove any vports */
2449 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2450 fc_queue_work(shost, &vport->vport_delete_work);
2451
2452 /* Remove any remote ports */
2453 list_for_each_entry_safe(rport, next_rport,
2454 &fc_host->rports, peers) {
2455 list_del(&rport->peers);
2456 rport->port_state = FC_PORTSTATE_DELETED;
2457 fc_queue_work(shost, &rport->rport_delete_work);
2458 }
2459
2460 list_for_each_entry_safe(rport, next_rport,
2461 &fc_host->rport_bindings, peers) {
2462 list_del(&rport->peers);
2463 rport->port_state = FC_PORTSTATE_DELETED;
2464 fc_queue_work(shost, &rport->rport_delete_work);
2465 }
2466
2467 spin_unlock_irqrestore(shost->host_lock, flags);
2468
2469 /* flush all scan work items */
2470 scsi_flush_work(shost);
2471
2472 /* flush all stgt delete, and rport delete work items, then kill it */
2473 if (fc_host->work_q) {
2474 work_q = fc_host->work_q;
2475 fc_host->work_q = NULL;
2476 destroy_workqueue(work_q);
2477 }
2478
2479 /* flush all devloss work items, then kill it */
2480 if (fc_host->devloss_work_q) {
2481 work_q = fc_host->devloss_work_q;
2482 fc_host->devloss_work_q = NULL;
2483 destroy_workqueue(work_q);
2484 }
2485 }
2486 EXPORT_SYMBOL(fc_remove_host);
2487
2488 static void fc_terminate_rport_io(struct fc_rport *rport)
2489 {
2490 struct Scsi_Host *shost = rport_to_shost(rport);
2491 struct fc_internal *i = to_fc_internal(shost->transportt);
2492
2493 /* Involve the LLDD if possible to terminate all io on the rport. */
2494 if (i->f->terminate_rport_io)
2495 i->f->terminate_rport_io(rport);
2496
2497 /*
2498 * Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
2499 */
2500 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
2501 }
2502
2503 /**
2504 * fc_starget_delete - called to delete the scsi descendants of an rport
2505 * @work: remote port to be operated on.
2506 *
2507 * Deletes target and all sdevs.
2508 */
2509 static void
2510 fc_starget_delete(struct work_struct *work)
2511 {
2512 struct fc_rport *rport =
2513 container_of(work, struct fc_rport, stgt_delete_work);
2514
2515 fc_terminate_rport_io(rport);
2516 scsi_remove_target(&rport->dev);
2517 }
2518
2519
2520 /**
2521 * fc_rport_final_delete - finish rport termination and delete it.
2522 * @work: remote port to be deleted.
2523 */
2524 static void
2525 fc_rport_final_delete(struct work_struct *work)
2526 {
2527 struct fc_rport *rport =
2528 container_of(work, struct fc_rport, rport_delete_work);
2529 struct device *dev = &rport->dev;
2530 struct Scsi_Host *shost = rport_to_shost(rport);
2531 struct fc_internal *i = to_fc_internal(shost->transportt);
2532 unsigned long flags;
2533 int do_callback = 0;
2534
2535 fc_terminate_rport_io(rport);
2536
2537 /*
2538 * if a scan is pending, flush the SCSI Host work_q so that
2539 * that we can reclaim the rport scan work element.
2540 */
2541 if (rport->flags & FC_RPORT_SCAN_PENDING)
2542 scsi_flush_work(shost);
2543
2544 /*
2545 * Cancel any outstanding timers. These should really exist
2546 * only when rmmod'ing the LLDD and we're asking for
2547 * immediate termination of the rports
2548 */
2549 spin_lock_irqsave(shost->host_lock, flags);
2550 if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2551 spin_unlock_irqrestore(shost->host_lock, flags);
2552 if (!cancel_delayed_work(&rport->fail_io_work))
2553 fc_flush_devloss(shost);
2554 if (!cancel_delayed_work(&rport->dev_loss_work))
2555 fc_flush_devloss(shost);
2556 spin_lock_irqsave(shost->host_lock, flags);
2557 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2558 }
2559 spin_unlock_irqrestore(shost->host_lock, flags);
2560
2561 /* Delete SCSI target and sdevs */
2562 if (rport->scsi_target_id != -1)
2563 fc_starget_delete(&rport->stgt_delete_work);
2564
2565 /*
2566 * Notify the driver that the rport is now dead. The LLDD will
2567 * also guarantee that any communication to the rport is terminated
2568 *
2569 * Avoid this call if we already called it when we preserved the
2570 * rport for the binding.
2571 */
2572 spin_lock_irqsave(shost->host_lock, flags);
2573 if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2574 (i->f->dev_loss_tmo_callbk)) {
2575 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2576 do_callback = 1;
2577 }
2578 spin_unlock_irqrestore(shost->host_lock, flags);
2579
2580 if (do_callback)
2581 i->f->dev_loss_tmo_callbk(rport);
2582
2583 fc_bsg_remove(rport->rqst_q);
2584
2585 transport_remove_device(dev);
2586 device_del(dev);
2587 transport_destroy_device(dev);
2588 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2589 put_device(dev); /* for self-reference */
2590 }
2591
2592
2593 /**
2594 * fc_rport_create - allocates and creates a remote FC port.
2595 * @shost: scsi host the remote port is connected to.
2596 * @channel: Channel on shost port connected to.
2597 * @ids: The world wide names, fc address, and FC4 port
2598 * roles for the remote port.
2599 *
2600 * Allocates and creates the remoter port structure, including the
2601 * class and sysfs creation.
2602 *
2603 * Notes:
2604 * This routine assumes no locks are held on entry.
2605 */
2606 static struct fc_rport *
2607 fc_rport_create(struct Scsi_Host *shost, int channel,
2608 struct fc_rport_identifiers *ids)
2609 {
2610 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2611 struct fc_internal *fci = to_fc_internal(shost->transportt);
2612 struct fc_rport *rport;
2613 struct device *dev;
2614 unsigned long flags;
2615 int error;
2616 size_t size;
2617
2618 size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2619 rport = kzalloc(size, GFP_KERNEL);
2620 if (unlikely(!rport)) {
2621 printk(KERN_ERR "%s: allocation failure\n", __func__);
2622 return NULL;
2623 }
2624
2625 rport->maxframe_size = -1;
2626 rport->supported_classes = FC_COS_UNSPECIFIED;
2627 rport->dev_loss_tmo = fc_host->dev_loss_tmo;
2628 memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2629 memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2630 rport->port_id = ids->port_id;
2631 rport->roles = ids->roles;
2632 rport->port_state = FC_PORTSTATE_ONLINE;
2633 if (fci->f->dd_fcrport_size)
2634 rport->dd_data = &rport[1];
2635 rport->channel = channel;
2636 rport->fast_io_fail_tmo = -1;
2637
2638 INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2639 INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2640 INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2641 INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2642 INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2643
2644 spin_lock_irqsave(shost->host_lock, flags);
2645
2646 rport->number = fc_host->next_rport_number++;
2647 if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2648 rport->scsi_target_id = fc_host->next_target_id++;
2649 else
2650 rport->scsi_target_id = -1;
2651 list_add_tail(&rport->peers, &fc_host->rports);
2652 get_device(&shost->shost_gendev); /* for fc_host->rport list */
2653
2654 spin_unlock_irqrestore(shost->host_lock, flags);
2655
2656 dev = &rport->dev;
2657 device_initialize(dev); /* takes self reference */
2658 dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2659 dev->release = fc_rport_dev_release;
2660 dev_set_name(dev, "rport-%d:%d-%d",
2661 shost->host_no, channel, rport->number);
2662 transport_setup_device(dev);
2663
2664 error = device_add(dev);
2665 if (error) {
2666 printk(KERN_ERR "FC Remote Port device_add failed\n");
2667 goto delete_rport;
2668 }
2669 transport_add_device(dev);
2670 transport_configure_device(dev);
2671
2672 fc_bsg_rportadd(shost, rport);
2673 /* ignore any bsg add error - we just can't do sgio */
2674
2675 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2676 /* initiate a scan of the target */
2677 rport->flags |= FC_RPORT_SCAN_PENDING;
2678 scsi_queue_work(shost, &rport->scan_work);
2679 }
2680
2681 return rport;
2682
2683 delete_rport:
2684 transport_destroy_device(dev);
2685 spin_lock_irqsave(shost->host_lock, flags);
2686 list_del(&rport->peers);
2687 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2688 spin_unlock_irqrestore(shost->host_lock, flags);
2689 put_device(dev->parent);
2690 kfree(rport);
2691 return NULL;
2692 }
2693
2694 /**
2695 * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2696 * @shost: scsi host the remote port is connected to.
2697 * @channel: Channel on shost port connected to.
2698 * @ids: The world wide names, fc address, and FC4 port
2699 * roles for the remote port.
2700 *
2701 * The LLDD calls this routine to notify the transport of the existence
2702 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2703 * of the port, it's FC address (port_id), and the FC4 roles that are
2704 * active for the port.
2705 *
2706 * For ports that are FCP targets (aka scsi targets), the FC transport
2707 * maintains consistent target id bindings on behalf of the LLDD.
2708 * A consistent target id binding is an assignment of a target id to
2709 * a remote port identifier, which persists while the scsi host is
2710 * attached. The remote port can disappear, then later reappear, and
2711 * it's target id assignment remains the same. This allows for shifts
2712 * in FC addressing (if binding by wwpn or wwnn) with no apparent
2713 * changes to the scsi subsystem which is based on scsi host number and
2714 * target id values. Bindings are only valid during the attachment of
2715 * the scsi host. If the host detaches, then later re-attaches, target
2716 * id bindings may change.
2717 *
2718 * This routine is responsible for returning a remote port structure.
2719 * The routine will search the list of remote ports it maintains
2720 * internally on behalf of consistent target id mappings. If found, the
2721 * remote port structure will be reused. Otherwise, a new remote port
2722 * structure will be allocated.
2723 *
2724 * Whenever a remote port is allocated, a new fc_remote_port class
2725 * device is created.
2726 *
2727 * Should not be called from interrupt context.
2728 *
2729 * Notes:
2730 * This routine assumes no locks are held on entry.
2731 */
2732 struct fc_rport *
2733 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2734 struct fc_rport_identifiers *ids)
2735 {
2736 struct fc_internal *fci = to_fc_internal(shost->transportt);
2737 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2738 struct fc_rport *rport;
2739 unsigned long flags;
2740 int match = 0;
2741
2742 /* ensure any stgt delete functions are done */
2743 fc_flush_work(shost);
2744
2745 /*
2746 * Search the list of "active" rports, for an rport that has been
2747 * deleted, but we've held off the real delete while the target
2748 * is in a "blocked" state.
2749 */
2750 spin_lock_irqsave(shost->host_lock, flags);
2751
2752 list_for_each_entry(rport, &fc_host->rports, peers) {
2753
2754 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2755 (rport->channel == channel)) {
2756
2757 switch (fc_host->tgtid_bind_type) {
2758 case FC_TGTID_BIND_BY_WWPN:
2759 case FC_TGTID_BIND_NONE:
2760 if (rport->port_name == ids->port_name)
2761 match = 1;
2762 break;
2763 case FC_TGTID_BIND_BY_WWNN:
2764 if (rport->node_name == ids->node_name)
2765 match = 1;
2766 break;
2767 case FC_TGTID_BIND_BY_ID:
2768 if (rport->port_id == ids->port_id)
2769 match = 1;
2770 break;
2771 }
2772
2773 if (match) {
2774
2775 memcpy(&rport->node_name, &ids->node_name,
2776 sizeof(rport->node_name));
2777 memcpy(&rport->port_name, &ids->port_name,
2778 sizeof(rport->port_name));
2779 rport->port_id = ids->port_id;
2780
2781 rport->port_state = FC_PORTSTATE_ONLINE;
2782 rport->roles = ids->roles;
2783
2784 spin_unlock_irqrestore(shost->host_lock, flags);
2785
2786 if (fci->f->dd_fcrport_size)
2787 memset(rport->dd_data, 0,
2788 fci->f->dd_fcrport_size);
2789
2790 /*
2791 * If we were not a target, cancel the
2792 * io terminate and rport timers, and
2793 * we're done.
2794 *
2795 * If we were a target, but our new role
2796 * doesn't indicate a target, leave the
2797 * timers running expecting the role to
2798 * change as the target fully logs in. If
2799 * it doesn't, the target will be torn down.
2800 *
2801 * If we were a target, and our role shows
2802 * we're still a target, cancel the timers
2803 * and kick off a scan.
2804 */
2805
2806 /* was a target, not in roles */
2807 if ((rport->scsi_target_id != -1) &&
2808 (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2809 return rport;
2810
2811 /*
2812 * Stop the fail io and dev_loss timers.
2813 * If they flush, the port_state will
2814 * be checked and will NOOP the function.
2815 */
2816 if (!cancel_delayed_work(&rport->fail_io_work))
2817 fc_flush_devloss(shost);
2818 if (!cancel_delayed_work(&rport->dev_loss_work))
2819 fc_flush_devloss(shost);
2820
2821 spin_lock_irqsave(shost->host_lock, flags);
2822
2823 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2824 FC_RPORT_DEVLOSS_PENDING |
2825 FC_RPORT_DEVLOSS_CALLBK_DONE);
2826
2827 spin_unlock_irqrestore(shost->host_lock, flags);
2828
2829 /* if target, initiate a scan */
2830 if (rport->scsi_target_id != -1) {
2831 scsi_target_unblock(&rport->dev,
2832 SDEV_RUNNING);
2833 spin_lock_irqsave(shost->host_lock,
2834 flags);
2835 rport->flags |= FC_RPORT_SCAN_PENDING;
2836 scsi_queue_work(shost,
2837 &rport->scan_work);
2838 spin_unlock_irqrestore(shost->host_lock,
2839 flags);
2840 }
2841
2842 fc_bsg_goose_queue(rport);
2843
2844 return rport;
2845 }
2846 }
2847 }
2848
2849 /*
2850 * Search the bindings array
2851 * Note: if never a FCP target, you won't be on this list
2852 */
2853 if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2854
2855 /* search for a matching consistent binding */
2856
2857 list_for_each_entry(rport, &fc_host->rport_bindings,
2858 peers) {
2859 if (rport->channel != channel)
2860 continue;
2861
2862 switch (fc_host->tgtid_bind_type) {
2863 case FC_TGTID_BIND_BY_WWPN:
2864 if (rport->port_name == ids->port_name)
2865 match = 1;
2866 break;
2867 case FC_TGTID_BIND_BY_WWNN:
2868 if (rport->node_name == ids->node_name)
2869 match = 1;
2870 break;
2871 case FC_TGTID_BIND_BY_ID:
2872 if (rport->port_id == ids->port_id)
2873 match = 1;
2874 break;
2875 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2876 break;
2877 }
2878
2879 if (match) {
2880 list_move_tail(&rport->peers, &fc_host->rports);
2881 break;
2882 }
2883 }
2884
2885 if (match) {
2886 memcpy(&rport->node_name, &ids->node_name,
2887 sizeof(rport->node_name));
2888 memcpy(&rport->port_name, &ids->port_name,
2889 sizeof(rport->port_name));
2890 rport->port_id = ids->port_id;
2891 rport->roles = ids->roles;
2892 rport->port_state = FC_PORTSTATE_ONLINE;
2893 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2894
2895 if (fci->f->dd_fcrport_size)
2896 memset(rport->dd_data, 0,
2897 fci->f->dd_fcrport_size);
2898 spin_unlock_irqrestore(shost->host_lock, flags);
2899
2900 if (ids->roles & FC_PORT_ROLE_FCP_TARGET) {
2901 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
2902
2903 /* initiate a scan of the target */
2904 spin_lock_irqsave(shost->host_lock, flags);
2905 rport->flags |= FC_RPORT_SCAN_PENDING;
2906 scsi_queue_work(shost, &rport->scan_work);
2907 spin_unlock_irqrestore(shost->host_lock, flags);
2908 }
2909 return rport;
2910 }
2911 }
2912
2913 spin_unlock_irqrestore(shost->host_lock, flags);
2914
2915 /* No consistent binding found - create new remote port entry */
2916 rport = fc_rport_create(shost, channel, ids);
2917
2918 return rport;
2919 }
2920 EXPORT_SYMBOL(fc_remote_port_add);
2921
2922
2923 /**
2924 * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2925 * @rport: The remote port that no longer exists
2926 *
2927 * The LLDD calls this routine to notify the transport that a remote
2928 * port is no longer part of the topology. Note: Although a port
2929 * may no longer be part of the topology, it may persist in the remote
2930 * ports displayed by the fc_host. We do this under 2 conditions:
2931 * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2932 * This allows the port to temporarily disappear, then reappear without
2933 * disrupting the SCSI device tree attached to it. During the "blocked"
2934 * period the port will still exist.
2935 * 2) If the port was a scsi target and disappears for longer than we
2936 * expect, we'll delete the port and the tear down the SCSI device tree
2937 * attached to it. However, we want to semi-persist the target id assigned
2938 * to that port if it eventually does exist. The port structure will
2939 * remain (although with minimal information) so that the target id
2940 * bindings remails.
2941 *
2942 * If the remote port is not an FCP Target, it will be fully torn down
2943 * and deallocated, including the fc_remote_port class device.
2944 *
2945 * If the remote port is an FCP Target, the port will be placed in a
2946 * temporary blocked state. From the LLDD's perspective, the rport no
2947 * longer exists. From the SCSI midlayer's perspective, the SCSI target
2948 * exists, but all sdevs on it are blocked from further I/O. The following
2949 * is then expected.
2950 *
2951 * If the remote port does not return (signaled by a LLDD call to
2952 * fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2953 * scsi target is removed - killing all outstanding i/o and removing the
2954 * scsi devices attached ot it. The port structure will be marked Not
2955 * Present and be partially cleared, leaving only enough information to
2956 * recognize the remote port relative to the scsi target id binding if
2957 * it later appears. The port will remain as long as there is a valid
2958 * binding (e.g. until the user changes the binding type or unloads the
2959 * scsi host with the binding).
2960 *
2961 * If the remote port returns within the dev_loss_tmo value (and matches
2962 * according to the target id binding type), the port structure will be
2963 * reused. If it is no longer a SCSI target, the target will be torn
2964 * down. If it continues to be a SCSI target, then the target will be
2965 * unblocked (allowing i/o to be resumed), and a scan will be activated
2966 * to ensure that all luns are detected.
2967 *
2968 * Called from normal process context only - cannot be called from interrupt.
2969 *
2970 * Notes:
2971 * This routine assumes no locks are held on entry.
2972 */
2973 void
2974 fc_remote_port_delete(struct fc_rport *rport)
2975 {
2976 struct Scsi_Host *shost = rport_to_shost(rport);
2977 unsigned long timeout = rport->dev_loss_tmo;
2978 unsigned long flags;
2979
2980 /*
2981 * No need to flush the fc_host work_q's, as all adds are synchronous.
2982 *
2983 * We do need to reclaim the rport scan work element, so eventually
2984 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2985 * there's still a scan pending.
2986 */
2987
2988 spin_lock_irqsave(shost->host_lock, flags);
2989
2990 if (rport->port_state != FC_PORTSTATE_ONLINE) {
2991 spin_unlock_irqrestore(shost->host_lock, flags);
2992 return;
2993 }
2994
2995 /*
2996 * In the past, we if this was not an FCP-Target, we would
2997 * unconditionally just jump to deleting the rport.
2998 * However, rports can be used as node containers by the LLDD,
2999 * and its not appropriate to just terminate the rport at the
3000 * first sign of a loss in connectivity. The LLDD may want to
3001 * send ELS traffic to re-validate the login. If the rport is
3002 * immediately deleted, it makes it inappropriate for a node
3003 * container.
3004 * So... we now unconditionally wait dev_loss_tmo before
3005 * destroying an rport.
3006 */
3007
3008 rport->port_state = FC_PORTSTATE_BLOCKED;
3009
3010 rport->flags |= FC_RPORT_DEVLOSS_PENDING;
3011
3012 spin_unlock_irqrestore(shost->host_lock, flags);
3013
3014 if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
3015 shost->active_mode & MODE_TARGET)
3016 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
3017
3018 scsi_target_block(&rport->dev);
3019
3020 /* see if we need to kill io faster than waiting for device loss */
3021 if ((rport->fast_io_fail_tmo != -1) &&
3022 (rport->fast_io_fail_tmo < timeout))
3023 fc_queue_devloss_work(shost, &rport->fail_io_work,
3024 rport->fast_io_fail_tmo * HZ);
3025
3026 /* cap the length the devices can be blocked until they are deleted */
3027 fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
3028 }
3029 EXPORT_SYMBOL(fc_remote_port_delete);
3030
3031 /**
3032 * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
3033 * @rport: The remote port that changed.
3034 * @roles: New roles for this port.
3035 *
3036 * Description: The LLDD calls this routine to notify the transport that the
3037 * roles on a remote port may have changed. The largest effect of this is
3038 * if a port now becomes a FCP Target, it must be allocated a
3039 * scsi target id. If the port is no longer a FCP target, any
3040 * scsi target id value assigned to it will persist in case the
3041 * role changes back to include FCP Target. No changes in the scsi
3042 * midlayer will be invoked if the role changes (in the expectation
3043 * that the role will be resumed. If it doesn't normal error processing
3044 * will take place).
3045 *
3046 * Should not be called from interrupt context.
3047 *
3048 * Notes:
3049 * This routine assumes no locks are held on entry.
3050 */
3051 void
3052 fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
3053 {
3054 struct Scsi_Host *shost = rport_to_shost(rport);
3055 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3056 unsigned long flags;
3057 int create = 0;
3058 int ret;
3059
3060 spin_lock_irqsave(shost->host_lock, flags);
3061 if (roles & FC_PORT_ROLE_FCP_TARGET) {
3062 if (rport->scsi_target_id == -1) {
3063 rport->scsi_target_id = fc_host->next_target_id++;
3064 create = 1;
3065 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3066 create = 1;
3067 } else if (shost->active_mode & MODE_TARGET) {
3068 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
3069 (char *)&rport->node_name);
3070 if (ret)
3071 printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
3072 ret);
3073 }
3074
3075 rport->roles = roles;
3076
3077 spin_unlock_irqrestore(shost->host_lock, flags);
3078
3079 if (create) {
3080 /*
3081 * There may have been a delete timer running on the
3082 * port. Ensure that it is cancelled as we now know
3083 * the port is an FCP Target.
3084 * Note: we know the rport is exists and in an online
3085 * state as the LLDD would not have had an rport
3086 * reference to pass us.
3087 *
3088 * Take no action on the del_timer failure as the state
3089 * machine state change will validate the
3090 * transaction.
3091 */
3092 if (!cancel_delayed_work(&rport->fail_io_work))
3093 fc_flush_devloss(shost);
3094 if (!cancel_delayed_work(&rport->dev_loss_work))
3095 fc_flush_devloss(shost);
3096
3097 spin_lock_irqsave(shost->host_lock, flags);
3098 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3099 FC_RPORT_DEVLOSS_PENDING |
3100 FC_RPORT_DEVLOSS_CALLBK_DONE);
3101 spin_unlock_irqrestore(shost->host_lock, flags);
3102
3103 /* ensure any stgt delete functions are done */
3104 fc_flush_work(shost);
3105
3106 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
3107 /* initiate a scan of the target */
3108 spin_lock_irqsave(shost->host_lock, flags);
3109 rport->flags |= FC_RPORT_SCAN_PENDING;
3110 scsi_queue_work(shost, &rport->scan_work);
3111 spin_unlock_irqrestore(shost->host_lock, flags);
3112 }
3113 }
3114 EXPORT_SYMBOL(fc_remote_port_rolechg);
3115
3116 /**
3117 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3118 * @work: rport target that failed to reappear in the allotted time.
3119 *
3120 * Description: An attempt to delete a remote port blocks, and if it fails
3121 * to return in the allotted time this gets called.
3122 */
3123 static void
3124 fc_timeout_deleted_rport(struct work_struct *work)
3125 {
3126 struct fc_rport *rport =
3127 container_of(work, struct fc_rport, dev_loss_work.work);
3128 struct Scsi_Host *shost = rport_to_shost(rport);
3129 struct fc_internal *i = to_fc_internal(shost->transportt);
3130 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3131 unsigned long flags;
3132 int do_callback = 0;
3133
3134 spin_lock_irqsave(shost->host_lock, flags);
3135
3136 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3137
3138 /*
3139 * If the port is ONLINE, then it came back. If it was a SCSI
3140 * target, validate it still is. If not, tear down the
3141 * scsi_target on it.
3142 */
3143 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3144 (rport->scsi_target_id != -1) &&
3145 !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3146 dev_printk(KERN_ERR, &rport->dev,
3147 "blocked FC remote port time out: no longer"
3148 " a FCP target, removing starget\n");
3149 spin_unlock_irqrestore(shost->host_lock, flags);
3150 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
3151 fc_queue_work(shost, &rport->stgt_delete_work);
3152 return;
3153 }
3154
3155 /* NOOP state - we're flushing workq's */
3156 if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3157 spin_unlock_irqrestore(shost->host_lock, flags);
3158 dev_printk(KERN_ERR, &rport->dev,
3159 "blocked FC remote port time out: leaving"
3160 " rport%s alone\n",
3161 (rport->scsi_target_id != -1) ? " and starget" : "");
3162 return;
3163 }
3164
3165 if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3166 (rport->scsi_target_id == -1)) {
3167 list_del(&rport->peers);
3168 rport->port_state = FC_PORTSTATE_DELETED;
3169 dev_printk(KERN_ERR, &rport->dev,
3170 "blocked FC remote port time out: removing"
3171 " rport%s\n",
3172 (rport->scsi_target_id != -1) ? " and starget" : "");
3173 fc_queue_work(shost, &rport->rport_delete_work);
3174 spin_unlock_irqrestore(shost->host_lock, flags);
3175 return;
3176 }
3177
3178 dev_printk(KERN_ERR, &rport->dev,
3179 "blocked FC remote port time out: removing target and "
3180 "saving binding\n");
3181
3182 list_move_tail(&rport->peers, &fc_host->rport_bindings);
3183
3184 /*
3185 * Note: We do not remove or clear the hostdata area. This allows
3186 * host-specific target data to persist along with the
3187 * scsi_target_id. It's up to the host to manage it's hostdata area.
3188 */
3189
3190 /*
3191 * Reinitialize port attributes that may change if the port comes back.
3192 */
3193 rport->maxframe_size = -1;
3194 rport->supported_classes = FC_COS_UNSPECIFIED;
3195 rport->roles = FC_PORT_ROLE_UNKNOWN;
3196 rport->port_state = FC_PORTSTATE_NOTPRESENT;
3197 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3198
3199 /*
3200 * Pre-emptively kill I/O rather than waiting for the work queue
3201 * item to teardown the starget. (FCOE libFC folks prefer this
3202 * and to have the rport_port_id still set when it's done).
3203 */
3204 spin_unlock_irqrestore(shost->host_lock, flags);
3205 fc_terminate_rport_io(rport);
3206
3207 spin_lock_irqsave(shost->host_lock, flags);
3208
3209 if (rport->port_state == FC_PORTSTATE_NOTPRESENT) { /* still missing */
3210
3211 /* remove the identifiers that aren't used in the consisting binding */
3212 switch (fc_host->tgtid_bind_type) {
3213 case FC_TGTID_BIND_BY_WWPN:
3214 rport->node_name = -1;
3215 rport->port_id = -1;
3216 break;
3217 case FC_TGTID_BIND_BY_WWNN:
3218 rport->port_name = -1;
3219 rport->port_id = -1;
3220 break;
3221 case FC_TGTID_BIND_BY_ID:
3222 rport->node_name = -1;
3223 rport->port_name = -1;
3224 break;
3225 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3226 break;
3227 }
3228
3229 /*
3230 * As this only occurs if the remote port (scsi target)
3231 * went away and didn't come back - we'll remove
3232 * all attached scsi devices.
3233 */
3234 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3235 fc_queue_work(shost, &rport->stgt_delete_work);
3236
3237 do_callback = 1;
3238 }
3239
3240 spin_unlock_irqrestore(shost->host_lock, flags);
3241
3242 /*
3243 * Notify the driver that the rport is now dead. The LLDD will
3244 * also guarantee that any communication to the rport is terminated
3245 *
3246 * Note: we set the CALLBK_DONE flag above to correspond
3247 */
3248 if (do_callback && i->f->dev_loss_tmo_callbk)
3249 i->f->dev_loss_tmo_callbk(rport);
3250 }
3251
3252
3253 /**
3254 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3255 * @work: rport to terminate io on.
3256 *
3257 * Notes: Only requests the failure of the io, not that all are flushed
3258 * prior to returning.
3259 */
3260 static void
3261 fc_timeout_fail_rport_io(struct work_struct *work)
3262 {
3263 struct fc_rport *rport =
3264 container_of(work, struct fc_rport, fail_io_work.work);
3265
3266 if (rport->port_state != FC_PORTSTATE_BLOCKED)
3267 return;
3268
3269 rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3270 fc_terminate_rport_io(rport);
3271 }
3272
3273 /**
3274 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3275 * @work: remote port to be scanned.
3276 */
3277 static void
3278 fc_scsi_scan_rport(struct work_struct *work)
3279 {
3280 struct fc_rport *rport =
3281 container_of(work, struct fc_rport, scan_work);
3282 struct Scsi_Host *shost = rport_to_shost(rport);
3283 struct fc_internal *i = to_fc_internal(shost->transportt);
3284 unsigned long flags;
3285
3286 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3287 (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3288 !(i->f->disable_target_scan)) {
3289 scsi_scan_target(&rport->dev, rport->channel,
3290 rport->scsi_target_id, SCAN_WILD_CARD, 1);
3291 }
3292
3293 spin_lock_irqsave(shost->host_lock, flags);
3294 rport->flags &= ~FC_RPORT_SCAN_PENDING;
3295 spin_unlock_irqrestore(shost->host_lock, flags);
3296 }
3297
3298 /**
3299 * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3300 * @cmnd: SCSI command that scsi_eh is trying to recover
3301 *
3302 * This routine can be called from a FC LLD scsi_eh callback. It
3303 * blocks the scsi_eh thread until the fc_rport leaves the
3304 * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3305 * necessary to avoid the scsi_eh failing recovery actions for blocked
3306 * rports which would lead to offlined SCSI devices.
3307 *
3308 * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3309 * FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3310 * passed back to scsi_eh.
3311 */
3312 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3313 {
3314 struct Scsi_Host *shost = cmnd->device->host;
3315 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3316 unsigned long flags;
3317
3318 spin_lock_irqsave(shost->host_lock, flags);
3319 while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3320 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3321 spin_unlock_irqrestore(shost->host_lock, flags);
3322 msleep(1000);
3323 spin_lock_irqsave(shost->host_lock, flags);
3324 }
3325 spin_unlock_irqrestore(shost->host_lock, flags);
3326
3327 if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3328 return FAST_IO_FAIL;
3329
3330 return 0;
3331 }
3332 EXPORT_SYMBOL(fc_block_scsi_eh);
3333
3334 /**
3335 * fc_vport_setup - allocates and creates a FC virtual port.
3336 * @shost: scsi host the virtual port is connected to.
3337 * @channel: Channel on shost port connected to.
3338 * @pdev: parent device for vport
3339 * @ids: The world wide names, FC4 port roles, etc for
3340 * the virtual port.
3341 * @ret_vport: The pointer to the created vport.
3342 *
3343 * Allocates and creates the vport structure, calls the parent host
3344 * to instantiate the vport, the completes w/ class and sysfs creation.
3345 *
3346 * Notes:
3347 * This routine assumes no locks are held on entry.
3348 */
3349 static int
3350 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3351 struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
3352 {
3353 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3354 struct fc_internal *fci = to_fc_internal(shost->transportt);
3355 struct fc_vport *vport;
3356 struct device *dev;
3357 unsigned long flags;
3358 size_t size;
3359 int error;
3360
3361 *ret_vport = NULL;
3362
3363 if ( ! fci->f->vport_create)
3364 return -ENOENT;
3365
3366 size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3367 vport = kzalloc(size, GFP_KERNEL);
3368 if (unlikely(!vport)) {
3369 printk(KERN_ERR "%s: allocation failure\n", __func__);
3370 return -ENOMEM;
3371 }
3372
3373 vport->vport_state = FC_VPORT_UNKNOWN;
3374 vport->vport_last_state = FC_VPORT_UNKNOWN;
3375 vport->node_name = ids->node_name;
3376 vport->port_name = ids->port_name;
3377 vport->roles = ids->roles;
3378 vport->vport_type = ids->vport_type;
3379 if (fci->f->dd_fcvport_size)
3380 vport->dd_data = &vport[1];
3381 vport->shost = shost;
3382 vport->channel = channel;
3383 vport->flags = FC_VPORT_CREATING;
3384 INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3385
3386 spin_lock_irqsave(shost->host_lock, flags);
3387
3388 if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3389 spin_unlock_irqrestore(shost->host_lock, flags);
3390 kfree(vport);
3391 return -ENOSPC;
3392 }
3393 fc_host->npiv_vports_inuse++;
3394 vport->number = fc_host->next_vport_number++;
3395 list_add_tail(&vport->peers, &fc_host->vports);
3396 get_device(&shost->shost_gendev); /* for fc_host->vport list */
3397
3398 spin_unlock_irqrestore(shost->host_lock, flags);
3399
3400 dev = &vport->dev;
3401 device_initialize(dev); /* takes self reference */
3402 dev->parent = get_device(pdev); /* takes parent reference */
3403 dev->release = fc_vport_dev_release;
3404 dev_set_name(dev, "vport-%d:%d-%d",
3405 shost->host_no, channel, vport->number);
3406 transport_setup_device(dev);
3407
3408 error = device_add(dev);
3409 if (error) {
3410 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3411 goto delete_vport;
3412 }
3413 transport_add_device(dev);
3414 transport_configure_device(dev);
3415
3416 error = fci->f->vport_create(vport, ids->disable);
3417 if (error) {
3418 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3419 goto delete_vport_all;
3420 }
3421
3422 /*
3423 * if the parent isn't the physical adapter's Scsi_Host, ensure
3424 * the Scsi_Host at least contains ia symlink to the vport.
3425 */
3426 if (pdev != &shost->shost_gendev) {
3427 error = sysfs_create_link(&shost->shost_gendev.kobj,
3428 &dev->kobj, dev_name(dev));
3429 if (error)
3430 printk(KERN_ERR
3431 "%s: Cannot create vport symlinks for "
3432 "%s, err=%d\n",
3433 __func__, dev_name(dev), error);
3434 }
3435 spin_lock_irqsave(shost->host_lock, flags);
3436 vport->flags &= ~FC_VPORT_CREATING;
3437 spin_unlock_irqrestore(shost->host_lock, flags);
3438
3439 dev_printk(KERN_NOTICE, pdev,
3440 "%s created via shost%d channel %d\n", dev_name(dev),
3441 shost->host_no, channel);
3442
3443 *ret_vport = vport;
3444
3445 return 0;
3446
3447 delete_vport_all:
3448 transport_remove_device(dev);
3449 device_del(dev);
3450 delete_vport:
3451 transport_destroy_device(dev);
3452 spin_lock_irqsave(shost->host_lock, flags);
3453 list_del(&vport->peers);
3454 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3455 fc_host->npiv_vports_inuse--;
3456 spin_unlock_irqrestore(shost->host_lock, flags);
3457 put_device(dev->parent);
3458 kfree(vport);
3459
3460 return error;
3461 }
3462
3463 /**
3464 * fc_vport_create - Admin App or LLDD requests creation of a vport
3465 * @shost: scsi host the virtual port is connected to.
3466 * @channel: channel on shost port connected to.
3467 * @ids: The world wide names, FC4 port roles, etc for
3468 * the virtual port.
3469 *
3470 * Notes:
3471 * This routine assumes no locks are held on entry.
3472 */
3473 struct fc_vport *
3474 fc_vport_create(struct Scsi_Host *shost, int channel,
3475 struct fc_vport_identifiers *ids)
3476 {
3477 int stat;
3478 struct fc_vport *vport;
3479
3480 stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3481 ids, &vport);
3482 return stat ? NULL : vport;
3483 }
3484 EXPORT_SYMBOL(fc_vport_create);
3485
3486 /**
3487 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3488 * @vport: fc_vport to be terminated
3489 *
3490 * Calls the LLDD vport_delete() function, then deallocates and removes
3491 * the vport from the shost and object tree.
3492 *
3493 * Notes:
3494 * This routine assumes no locks are held on entry.
3495 */
3496 int
3497 fc_vport_terminate(struct fc_vport *vport)
3498 {
3499 struct Scsi_Host *shost = vport_to_shost(vport);
3500 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3501 struct fc_internal *i = to_fc_internal(shost->transportt);
3502 struct device *dev = &vport->dev;
3503 unsigned long flags;
3504 int stat;
3505
3506 if (i->f->vport_delete)
3507 stat = i->f->vport_delete(vport);
3508 else
3509 stat = -ENOENT;
3510
3511 spin_lock_irqsave(shost->host_lock, flags);
3512 vport->flags &= ~FC_VPORT_DELETING;
3513 if (!stat) {
3514 vport->flags |= FC_VPORT_DELETED;
3515 list_del(&vport->peers);
3516 fc_host->npiv_vports_inuse--;
3517 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3518 }
3519 spin_unlock_irqrestore(shost->host_lock, flags);
3520
3521 if (stat)
3522 return stat;
3523
3524 if (dev->parent != &shost->shost_gendev)
3525 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3526 transport_remove_device(dev);
3527 device_del(dev);
3528 transport_destroy_device(dev);
3529
3530 /*
3531 * Removing our self-reference should mean our
3532 * release function gets called, which will drop the remaining
3533 * parent reference and free the data structure.
3534 */
3535 put_device(dev); /* for self-reference */
3536
3537 return 0; /* SUCCESS */
3538 }
3539 EXPORT_SYMBOL(fc_vport_terminate);
3540
3541 /**
3542 * fc_vport_sched_delete - workq-based delete request for a vport
3543 * @work: vport to be deleted.
3544 */
3545 static void
3546 fc_vport_sched_delete(struct work_struct *work)
3547 {
3548 struct fc_vport *vport =
3549 container_of(work, struct fc_vport, vport_delete_work);
3550 int stat;
3551
3552 stat = fc_vport_terminate(vport);
3553 if (stat)
3554 dev_printk(KERN_ERR, vport->dev.parent,
3555 "%s: %s could not be deleted created via "
3556 "shost%d channel %d - error %d\n", __func__,
3557 dev_name(&vport->dev), vport->shost->host_no,
3558 vport->channel, stat);
3559 }
3560
3561
3562 /*
3563 * BSG support
3564 */
3565
3566
3567 /**
3568 * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3569 * @job: fc_bsg_job that is to be torn down
3570 */
3571 static void
3572 fc_destroy_bsgjob(struct fc_bsg_job *job)
3573 {
3574 unsigned long flags;
3575
3576 spin_lock_irqsave(&job->job_lock, flags);
3577 if (job->ref_cnt) {
3578 spin_unlock_irqrestore(&job->job_lock, flags);
3579 return;
3580 }
3581 spin_unlock_irqrestore(&job->job_lock, flags);
3582
3583 put_device(job->dev); /* release reference for the request */
3584
3585 kfree(job->request_payload.sg_list);
3586 kfree(job->reply_payload.sg_list);
3587 kfree(job);
3588 }
3589
3590 /**
3591 * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3592 * completed
3593 * @job: fc_bsg_job that is complete
3594 */
3595 static void
3596 fc_bsg_jobdone(struct fc_bsg_job *job)
3597 {
3598 struct request *req = job->req;
3599 struct request *rsp = req->next_rq;
3600 int err;
3601
3602 err = job->req->errors = job->reply->result;
3603
3604 if (err < 0)
3605 /* we're only returning the result field in the reply */
3606 job->req->sense_len = sizeof(uint32_t);
3607 else
3608 job->req->sense_len = job->reply_len;
3609
3610 /* we assume all request payload was transferred, residual == 0 */
3611 req->resid_len = 0;
3612
3613 if (rsp) {
3614 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3615
3616 /* set reply (bidi) residual */
3617 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3618 rsp->resid_len);
3619 }
3620 blk_complete_request(req);
3621 }
3622
3623 /**
3624 * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3625 * @rq: BSG request that holds the job to be destroyed
3626 */
3627 static void fc_bsg_softirq_done(struct request *rq)
3628 {
3629 struct fc_bsg_job *job = rq->special;
3630 unsigned long flags;
3631
3632 spin_lock_irqsave(&job->job_lock, flags);
3633 job->state_flags |= FC_RQST_STATE_DONE;
3634 job->ref_cnt--;
3635 spin_unlock_irqrestore(&job->job_lock, flags);
3636
3637 blk_end_request_all(rq, rq->errors);
3638 fc_destroy_bsgjob(job);
3639 }
3640
3641 /**
3642 * fc_bsg_job_timeout - handler for when a bsg request timesout
3643 * @req: request that timed out
3644 */
3645 static enum blk_eh_timer_return
3646 fc_bsg_job_timeout(struct request *req)
3647 {
3648 struct fc_bsg_job *job = (void *) req->special;
3649 struct Scsi_Host *shost = job->shost;
3650 struct fc_internal *i = to_fc_internal(shost->transportt);
3651 unsigned long flags;
3652 int err = 0, done = 0;
3653
3654 if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3655 return BLK_EH_RESET_TIMER;
3656
3657 spin_lock_irqsave(&job->job_lock, flags);
3658 if (job->state_flags & FC_RQST_STATE_DONE)
3659 done = 1;
3660 else
3661 job->ref_cnt++;
3662 spin_unlock_irqrestore(&job->job_lock, flags);
3663
3664 if (!done && i->f->bsg_timeout) {
3665 /* call LLDD to abort the i/o as it has timed out */
3666 err = i->f->bsg_timeout(job);
3667 if (err == -EAGAIN) {
3668 job->ref_cnt--;
3669 return BLK_EH_RESET_TIMER;
3670 } else if (err)
3671 printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3672 "abort failed with status %d\n", err);
3673 }
3674
3675 /* the blk_end_sync_io() doesn't check the error */
3676 if (done)
3677 return BLK_EH_NOT_HANDLED;
3678 else
3679 return BLK_EH_HANDLED;
3680 }
3681
3682 static int
3683 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3684 {
3685 size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3686
3687 BUG_ON(!req->nr_phys_segments);
3688
3689 buf->sg_list = kzalloc(sz, GFP_KERNEL);
3690 if (!buf->sg_list)
3691 return -ENOMEM;
3692 sg_init_table(buf->sg_list, req->nr_phys_segments);
3693 buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3694 buf->payload_len = blk_rq_bytes(req);
3695 return 0;
3696 }
3697
3698
3699 /**
3700 * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3701 * bsg request
3702 * @shost: SCSI Host corresponding to the bsg object
3703 * @rport: (optional) FC Remote Port corresponding to the bsg object
3704 * @req: BSG request that needs a job structure
3705 */
3706 static int
3707 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3708 struct request *req)
3709 {
3710 struct fc_internal *i = to_fc_internal(shost->transportt);
3711 struct request *rsp = req->next_rq;
3712 struct fc_bsg_job *job;
3713 int ret;
3714
3715 BUG_ON(req->special);
3716
3717 job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3718 GFP_KERNEL);
3719 if (!job)
3720 return -ENOMEM;
3721
3722 /*
3723 * Note: this is a bit silly.
3724 * The request gets formatted as a SGIO v4 ioctl request, which
3725 * then gets reformatted as a blk request, which then gets
3726 * reformatted as a fc bsg request. And on completion, we have
3727 * to wrap return results such that SGIO v4 thinks it was a scsi
3728 * status. I hope this was all worth it.
3729 */
3730
3731 req->special = job;
3732 job->shost = shost;
3733 job->rport = rport;
3734 job->req = req;
3735 if (i->f->dd_bsg_size)
3736 job->dd_data = (void *)&job[1];
3737 spin_lock_init(&job->job_lock);
3738 job->request = (struct fc_bsg_request *)req->cmd;
3739 job->request_len = req->cmd_len;
3740 job->reply = req->sense;
3741 job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3742 * allocated */
3743 if (req->bio) {
3744 ret = fc_bsg_map_buffer(&job->request_payload, req);
3745 if (ret)
3746 goto failjob_rls_job;
3747 }
3748 if (rsp && rsp->bio) {
3749 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3750 if (ret)
3751 goto failjob_rls_rqst_payload;
3752 }
3753 job->job_done = fc_bsg_jobdone;
3754 if (rport)
3755 job->dev = &rport->dev;
3756 else
3757 job->dev = &shost->shost_gendev;
3758 get_device(job->dev); /* take a reference for the request */
3759
3760 job->ref_cnt = 1;
3761
3762 return 0;
3763
3764
3765 failjob_rls_rqst_payload:
3766 kfree(job->request_payload.sg_list);
3767 failjob_rls_job:
3768 kfree(job);
3769 return -ENOMEM;
3770 }
3771
3772
3773 enum fc_dispatch_result {
3774 FC_DISPATCH_BREAK, /* on return, q is locked, break from q loop */
3775 FC_DISPATCH_LOCKED, /* on return, q is locked, continue on */
3776 FC_DISPATCH_UNLOCKED, /* on return, q is unlocked, continue on */
3777 };
3778
3779
3780 /**
3781 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3782 * @q: fc host request queue
3783 * @shost: scsi host rport attached to
3784 * @job: bsg job to be processed
3785 */
3786 static enum fc_dispatch_result
3787 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3788 struct fc_bsg_job *job)
3789 {
3790 struct fc_internal *i = to_fc_internal(shost->transportt);
3791 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3792 int ret;
3793
3794 /* Validate the host command */
3795 switch (job->request->msgcode) {
3796 case FC_BSG_HST_ADD_RPORT:
3797 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3798 break;
3799
3800 case FC_BSG_HST_DEL_RPORT:
3801 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3802 break;
3803
3804 case FC_BSG_HST_ELS_NOLOGIN:
3805 cmdlen += sizeof(struct fc_bsg_host_els);
3806 /* there better be a xmt and rcv payloads */
3807 if ((!job->request_payload.payload_len) ||
3808 (!job->reply_payload.payload_len)) {
3809 ret = -EINVAL;
3810 goto fail_host_msg;
3811 }
3812 break;
3813
3814 case FC_BSG_HST_CT:
3815 cmdlen += sizeof(struct fc_bsg_host_ct);
3816 /* there better be xmt and rcv payloads */
3817 if ((!job->request_payload.payload_len) ||
3818 (!job->reply_payload.payload_len)) {
3819 ret = -EINVAL;
3820 goto fail_host_msg;
3821 }
3822 break;
3823
3824 case FC_BSG_HST_VENDOR:
3825 cmdlen += sizeof(struct fc_bsg_host_vendor);
3826 if ((shost->hostt->vendor_id == 0L) ||
3827 (job->request->rqst_data.h_vendor.vendor_id !=
3828 shost->hostt->vendor_id)) {
3829 ret = -ESRCH;
3830 goto fail_host_msg;
3831 }
3832 break;
3833
3834 default:
3835 ret = -EBADR;
3836 goto fail_host_msg;
3837 }
3838
3839 /* check if we really have all the request data needed */
3840 if (job->request_len < cmdlen) {
3841 ret = -ENOMSG;
3842 goto fail_host_msg;
3843 }
3844
3845 ret = i->f->bsg_request(job);
3846 if (!ret)
3847 return FC_DISPATCH_UNLOCKED;
3848
3849 fail_host_msg:
3850 /* return the errno failure code as the only status */
3851 BUG_ON(job->reply_len < sizeof(uint32_t));
3852 job->reply->reply_payload_rcv_len = 0;
3853 job->reply->result = ret;
3854 job->reply_len = sizeof(uint32_t);
3855 fc_bsg_jobdone(job);
3856 return FC_DISPATCH_UNLOCKED;
3857 }
3858
3859
3860 /*
3861 * fc_bsg_goose_queue - restart rport queue in case it was stopped
3862 * @rport: rport to be restarted
3863 */
3864 static void
3865 fc_bsg_goose_queue(struct fc_rport *rport)
3866 {
3867 if (!rport->rqst_q)
3868 return;
3869
3870 /*
3871 * This get/put dance makes no sense
3872 */
3873 get_device(&rport->dev);
3874 blk_run_queue_async(rport->rqst_q);
3875 put_device(&rport->dev);
3876 }
3877
3878 /**
3879 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3880 * @q: rport request queue
3881 * @shost: scsi host rport attached to
3882 * @rport: rport request destined to
3883 * @job: bsg job to be processed
3884 */
3885 static enum fc_dispatch_result
3886 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3887 struct fc_rport *rport, struct fc_bsg_job *job)
3888 {
3889 struct fc_internal *i = to_fc_internal(shost->transportt);
3890 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3891 int ret;
3892
3893 /* Validate the rport command */
3894 switch (job->request->msgcode) {
3895 case FC_BSG_RPT_ELS:
3896 cmdlen += sizeof(struct fc_bsg_rport_els);
3897 goto check_bidi;
3898
3899 case FC_BSG_RPT_CT:
3900 cmdlen += sizeof(struct fc_bsg_rport_ct);
3901 check_bidi:
3902 /* there better be xmt and rcv payloads */
3903 if ((!job->request_payload.payload_len) ||
3904 (!job->reply_payload.payload_len)) {
3905 ret = -EINVAL;
3906 goto fail_rport_msg;
3907 }
3908 break;
3909 default:
3910 ret = -EBADR;
3911 goto fail_rport_msg;
3912 }
3913
3914 /* check if we really have all the request data needed */
3915 if (job->request_len < cmdlen) {
3916 ret = -ENOMSG;
3917 goto fail_rport_msg;
3918 }
3919
3920 ret = i->f->bsg_request(job);
3921 if (!ret)
3922 return FC_DISPATCH_UNLOCKED;
3923
3924 fail_rport_msg:
3925 /* return the errno failure code as the only status */
3926 BUG_ON(job->reply_len < sizeof(uint32_t));
3927 job->reply->reply_payload_rcv_len = 0;
3928 job->reply->result = ret;
3929 job->reply_len = sizeof(uint32_t);
3930 fc_bsg_jobdone(job);
3931 return FC_DISPATCH_UNLOCKED;
3932 }
3933
3934
3935 /**
3936 * fc_bsg_request_handler - generic handler for bsg requests
3937 * @q: request queue to manage
3938 * @shost: Scsi_Host related to the bsg object
3939 * @rport: FC remote port related to the bsg object (optional)
3940 * @dev: device structure for bsg object
3941 */
3942 static void
3943 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3944 struct fc_rport *rport, struct device *dev)
3945 {
3946 struct request *req;
3947 struct fc_bsg_job *job;
3948 enum fc_dispatch_result ret;
3949
3950 if (!get_device(dev))
3951 return;
3952
3953 while (1) {
3954 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
3955 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3956 break;
3957
3958 req = blk_fetch_request(q);
3959 if (!req)
3960 break;
3961
3962 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3963 req->errors = -ENXIO;
3964 spin_unlock_irq(q->queue_lock);
3965 blk_end_request_all(req, -ENXIO);
3966 spin_lock_irq(q->queue_lock);
3967 continue;
3968 }
3969
3970 spin_unlock_irq(q->queue_lock);
3971
3972 ret = fc_req_to_bsgjob(shost, rport, req);
3973 if (ret) {
3974 req->errors = ret;
3975 blk_end_request_all(req, ret);
3976 spin_lock_irq(q->queue_lock);
3977 continue;
3978 }
3979
3980 job = req->special;
3981
3982 /* check if we have the msgcode value at least */
3983 if (job->request_len < sizeof(uint32_t)) {
3984 BUG_ON(job->reply_len < sizeof(uint32_t));
3985 job->reply->reply_payload_rcv_len = 0;
3986 job->reply->result = -ENOMSG;
3987 job->reply_len = sizeof(uint32_t);
3988 fc_bsg_jobdone(job);
3989 spin_lock_irq(q->queue_lock);
3990 continue;
3991 }
3992
3993 /* the dispatch routines will unlock the queue_lock */
3994 if (rport)
3995 ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3996 else
3997 ret = fc_bsg_host_dispatch(q, shost, job);
3998
3999 /* did dispatcher hit state that can't process any more */
4000 if (ret == FC_DISPATCH_BREAK)
4001 break;
4002
4003 /* did dispatcher had released the lock */
4004 if (ret == FC_DISPATCH_UNLOCKED)
4005 spin_lock_irq(q->queue_lock);
4006 }
4007
4008 spin_unlock_irq(q->queue_lock);
4009 put_device(dev);
4010 spin_lock_irq(q->queue_lock);
4011 }
4012
4013
4014 /**
4015 * fc_bsg_host_handler - handler for bsg requests for a fc host
4016 * @q: fc host request queue
4017 */
4018 static void
4019 fc_bsg_host_handler(struct request_queue *q)
4020 {
4021 struct Scsi_Host *shost = q->queuedata;
4022
4023 fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
4024 }
4025
4026
4027 /**
4028 * fc_bsg_rport_handler - handler for bsg requests for a fc rport
4029 * @q: rport request queue
4030 */
4031 static void
4032 fc_bsg_rport_handler(struct request_queue *q)
4033 {
4034 struct fc_rport *rport = q->queuedata;
4035 struct Scsi_Host *shost = rport_to_shost(rport);
4036
4037 fc_bsg_request_handler(q, shost, rport, &rport->dev);
4038 }
4039
4040
4041 /**
4042 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
4043 * @shost: shost for fc_host
4044 * @fc_host: fc_host adding the structures to
4045 */
4046 static int
4047 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
4048 {
4049 struct device *dev = &shost->shost_gendev;
4050 struct fc_internal *i = to_fc_internal(shost->transportt);
4051 struct request_queue *q;
4052 int err;
4053 char bsg_name[20];
4054
4055 fc_host->rqst_q = NULL;
4056
4057 if (!i->f->bsg_request)
4058 return -ENOTSUPP;
4059
4060 snprintf(bsg_name, sizeof(bsg_name),
4061 "fc_host%d", shost->host_no);
4062
4063 q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
4064 if (!q) {
4065 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4066 "initialize - no request queue\n",
4067 shost->host_no);
4068 return -ENOMEM;
4069 }
4070
4071 q->queuedata = shost;
4072 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4073 blk_queue_softirq_done(q, fc_bsg_softirq_done);
4074 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4075 blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4076
4077 err = bsg_register_queue(q, dev, bsg_name, NULL);
4078 if (err) {
4079 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4080 "initialize - register queue\n",
4081 shost->host_no);
4082 blk_cleanup_queue(q);
4083 return err;
4084 }
4085
4086 fc_host->rqst_q = q;
4087 return 0;
4088 }
4089
4090
4091 /**
4092 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4093 * @shost: shost that rport is attached to
4094 * @rport: rport that the bsg hooks are being attached to
4095 */
4096 static int
4097 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4098 {
4099 struct device *dev = &rport->dev;
4100 struct fc_internal *i = to_fc_internal(shost->transportt);
4101 struct request_queue *q;
4102 int err;
4103
4104 rport->rqst_q = NULL;
4105
4106 if (!i->f->bsg_request)
4107 return -ENOTSUPP;
4108
4109 q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
4110 if (!q) {
4111 printk(KERN_ERR "%s: bsg interface failed to "
4112 "initialize - no request queue\n",
4113 dev->kobj.name);
4114 return -ENOMEM;
4115 }
4116
4117 q->queuedata = rport;
4118 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4119 blk_queue_softirq_done(q, fc_bsg_softirq_done);
4120 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4121 blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4122
4123 err = bsg_register_queue(q, dev, NULL, NULL);
4124 if (err) {
4125 printk(KERN_ERR "%s: bsg interface failed to "
4126 "initialize - register queue\n",
4127 dev->kobj.name);
4128 blk_cleanup_queue(q);
4129 return err;
4130 }
4131
4132 rport->rqst_q = q;
4133 return 0;
4134 }
4135
4136
4137 /**
4138 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4139 * @q: the request_queue that is to be torn down.
4140 *
4141 * Notes:
4142 * Before unregistering the queue empty any requests that are blocked
4143 *
4144 *
4145 */
4146 static void
4147 fc_bsg_remove(struct request_queue *q)
4148 {
4149 if (q) {
4150 bsg_unregister_queue(q);
4151 blk_cleanup_queue(q);
4152 }
4153 }
4154
4155
4156 /* Original Author: Martin Hicks */
4157 MODULE_AUTHOR("James Smart");
4158 MODULE_DESCRIPTION("FC Transport Attributes");
4159 MODULE_LICENSE("GPL");
4160
4161 module_init(fc_transport_init);
4162 module_exit(fc_transport_exit);
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