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PM: OMAP3: Removed a couple of unused variables from DVFS code
[linux-ginger.git] / drivers / scsi / scsi_transport_fc.c
bloba67fed10598acfc3dd00234d3f3222470d18a9f9
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 <scsi/scsi_device.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_transport.h>
33 #include <scsi/scsi_transport_fc.h>
34 #include <scsi/scsi_cmnd.h>
35 #include <linux/netlink.h>
36 #include <net/netlink.h>
37 #include <scsi/scsi_netlink_fc.h>
38 #include <scsi/scsi_bsg_fc.h>
39 #include "scsi_priv.h"
40 #include "scsi_transport_fc_internal.h"
41
42 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
43 static void fc_vport_sched_delete(struct work_struct *work);
44 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
45 struct device *pdev, struct fc_vport_identifiers *ids,
46 struct fc_vport **vport);
47 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
48 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
49 static void fc_bsg_remove(struct request_queue *);
50 static void fc_bsg_goose_queue(struct fc_rport *);
51
52 /*
53 * Redefine so that we can have same named attributes in the
54 * sdev/starget/host objects.
55 */
56 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
57 struct device_attribute device_attr_##_prefix##_##_name = \
58 __ATTR(_name,_mode,_show,_store)
59
60 #define fc_enum_name_search(title, table_type, table) \
61 static const char *get_fc_##title##_name(enum table_type table_key) \
62 { \
63 int i; \
64 char *name = NULL; \
65 \
66 for (i = 0; i < ARRAY_SIZE(table); i++) { \
67 if (table[i].value == table_key) { \
68 name = table[i].name; \
69 break; \
70 } \
71 } \
72 return name; \
73 }
74
75 #define fc_enum_name_match(title, table_type, table) \
76 static int get_fc_##title##_match(const char *table_key, \
77 enum table_type *value) \
78 { \
79 int i; \
80 \
81 for (i = 0; i < ARRAY_SIZE(table); i++) { \
82 if (strncmp(table_key, table[i].name, \
83 table[i].matchlen) == 0) { \
84 *value = table[i].value; \
85 return 0; /* success */ \
86 } \
87 } \
88 return 1; /* failure */ \
89 }
90
91
92 /* Convert fc_port_type values to ascii string name */
93 static struct {
94 enum fc_port_type value;
95 char *name;
96 } fc_port_type_names[] = {
97 { FC_PORTTYPE_UNKNOWN, "Unknown" },
98 { FC_PORTTYPE_OTHER, "Other" },
99 { FC_PORTTYPE_NOTPRESENT, "Not Present" },
100 { FC_PORTTYPE_NPORT, "NPort (fabric via point-to-point)" },
101 { FC_PORTTYPE_NLPORT, "NLPort (fabric via loop)" },
102 { FC_PORTTYPE_LPORT, "LPort (private loop)" },
103 { FC_PORTTYPE_PTP, "Point-To-Point (direct nport connection)" },
104 { FC_PORTTYPE_NPIV, "NPIV VPORT" },
105 };
106 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
107 #define FC_PORTTYPE_MAX_NAMELEN 50
108
109 /* Reuse fc_port_type enum function for vport_type */
110 #define get_fc_vport_type_name get_fc_port_type_name
111
112
113 /* Convert fc_host_event_code values to ascii string name */
114 static const struct {
115 enum fc_host_event_code value;
116 char *name;
117 } fc_host_event_code_names[] = {
118 { FCH_EVT_LIP, "lip" },
119 { FCH_EVT_LINKUP, "link_up" },
120 { FCH_EVT_LINKDOWN, "link_down" },
121 { FCH_EVT_LIPRESET, "lip_reset" },
122 { FCH_EVT_RSCN, "rscn" },
123 { FCH_EVT_ADAPTER_CHANGE, "adapter_chg" },
124 { FCH_EVT_PORT_UNKNOWN, "port_unknown" },
125 { FCH_EVT_PORT_ONLINE, "port_online" },
126 { FCH_EVT_PORT_OFFLINE, "port_offline" },
127 { FCH_EVT_PORT_FABRIC, "port_fabric" },
128 { FCH_EVT_LINK_UNKNOWN, "link_unknown" },
129 { FCH_EVT_VENDOR_UNIQUE, "vendor_unique" },
130 };
131 fc_enum_name_search(host_event_code, fc_host_event_code,
132 fc_host_event_code_names)
133 #define FC_HOST_EVENT_CODE_MAX_NAMELEN 30
134
135
136 /* Convert fc_port_state values to ascii string name */
137 static struct {
138 enum fc_port_state value;
139 char *name;
140 } fc_port_state_names[] = {
141 { FC_PORTSTATE_UNKNOWN, "Unknown" },
142 { FC_PORTSTATE_NOTPRESENT, "Not Present" },
143 { FC_PORTSTATE_ONLINE, "Online" },
144 { FC_PORTSTATE_OFFLINE, "Offline" },
145 { FC_PORTSTATE_BLOCKED, "Blocked" },
146 { FC_PORTSTATE_BYPASSED, "Bypassed" },
147 { FC_PORTSTATE_DIAGNOSTICS, "Diagnostics" },
148 { FC_PORTSTATE_LINKDOWN, "Linkdown" },
149 { FC_PORTSTATE_ERROR, "Error" },
150 { FC_PORTSTATE_LOOPBACK, "Loopback" },
151 { FC_PORTSTATE_DELETED, "Deleted" },
152 };
153 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
154 #define FC_PORTSTATE_MAX_NAMELEN 20
155
156
157 /* Convert fc_vport_state values to ascii string name */
158 static struct {
159 enum fc_vport_state value;
160 char *name;
161 } fc_vport_state_names[] = {
162 { FC_VPORT_UNKNOWN, "Unknown" },
163 { FC_VPORT_ACTIVE, "Active" },
164 { FC_VPORT_DISABLED, "Disabled" },
165 { FC_VPORT_LINKDOWN, "Linkdown" },
166 { FC_VPORT_INITIALIZING, "Initializing" },
167 { FC_VPORT_NO_FABRIC_SUPP, "No Fabric Support" },
168 { FC_VPORT_NO_FABRIC_RSCS, "No Fabric Resources" },
169 { FC_VPORT_FABRIC_LOGOUT, "Fabric Logout" },
170 { FC_VPORT_FABRIC_REJ_WWN, "Fabric Rejected WWN" },
171 { FC_VPORT_FAILED, "VPort Failed" },
172 };
173 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
174 #define FC_VPORTSTATE_MAX_NAMELEN 24
175
176 /* Reuse fc_vport_state enum function for vport_last_state */
177 #define get_fc_vport_last_state_name get_fc_vport_state_name
178
179
180 /* Convert fc_tgtid_binding_type values to ascii string name */
181 static const struct {
182 enum fc_tgtid_binding_type value;
183 char *name;
184 int matchlen;
185 } fc_tgtid_binding_type_names[] = {
186 { FC_TGTID_BIND_NONE, "none", 4 },
187 { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
188 { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
189 { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
190 };
191 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
192 fc_tgtid_binding_type_names)
193 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
194 fc_tgtid_binding_type_names)
195 #define FC_BINDTYPE_MAX_NAMELEN 30
196
197
198 #define fc_bitfield_name_search(title, table) \
199 static ssize_t \
200 get_fc_##title##_names(u32 table_key, char *buf) \
201 { \
202 char *prefix = ""; \
203 ssize_t len = 0; \
204 int i; \
205 \
206 for (i = 0; i < ARRAY_SIZE(table); i++) { \
207 if (table[i].value & table_key) { \
208 len += sprintf(buf + len, "%s%s", \
209 prefix, table[i].name); \
210 prefix = ", "; \
211 } \
212 } \
213 len += sprintf(buf + len, "\n"); \
214 return len; \
215 }
216
217
218 /* Convert FC_COS bit values to ascii string name */
219 static const struct {
220 u32 value;
221 char *name;
222 } fc_cos_names[] = {
223 { FC_COS_CLASS1, "Class 1" },
224 { FC_COS_CLASS2, "Class 2" },
225 { FC_COS_CLASS3, "Class 3" },
226 { FC_COS_CLASS4, "Class 4" },
227 { FC_COS_CLASS6, "Class 6" },
228 };
229 fc_bitfield_name_search(cos, fc_cos_names)
230
231
232 /* Convert FC_PORTSPEED bit values to ascii string name */
233 static const struct {
234 u32 value;
235 char *name;
236 } fc_port_speed_names[] = {
237 { FC_PORTSPEED_1GBIT, "1 Gbit" },
238 { FC_PORTSPEED_2GBIT, "2 Gbit" },
239 { FC_PORTSPEED_4GBIT, "4 Gbit" },
240 { FC_PORTSPEED_10GBIT, "10 Gbit" },
241 { FC_PORTSPEED_8GBIT, "8 Gbit" },
242 { FC_PORTSPEED_16GBIT, "16 Gbit" },
243 { FC_PORTSPEED_NOT_NEGOTIATED, "Not Negotiated" },
244 };
245 fc_bitfield_name_search(port_speed, fc_port_speed_names)
246
247
248 static int
249 show_fc_fc4s (char *buf, u8 *fc4_list)
250 {
251 int i, len=0;
252
253 for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
254 len += sprintf(buf + len , "0x%02x ", *fc4_list);
255 len += sprintf(buf + len, "\n");
256 return len;
257 }
258
259
260 /* Convert FC_PORT_ROLE bit values to ascii string name */
261 static const struct {
262 u32 value;
263 char *name;
264 } fc_port_role_names[] = {
265 { FC_PORT_ROLE_FCP_TARGET, "FCP Target" },
266 { FC_PORT_ROLE_FCP_INITIATOR, "FCP Initiator" },
267 { FC_PORT_ROLE_IP_PORT, "IP Port" },
268 };
269 fc_bitfield_name_search(port_roles, fc_port_role_names)
270
271 /*
272 * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
273 */
274 #define FC_WELLKNOWN_PORTID_MASK 0xfffff0
275 #define FC_WELLKNOWN_ROLE_MASK 0x00000f
276 #define FC_FPORT_PORTID 0x00000e
277 #define FC_FABCTLR_PORTID 0x00000d
278 #define FC_DIRSRVR_PORTID 0x00000c
279 #define FC_TIMESRVR_PORTID 0x00000b
280 #define FC_MGMTSRVR_PORTID 0x00000a
281
282
283 static void fc_timeout_deleted_rport(struct work_struct *work);
284 static void fc_timeout_fail_rport_io(struct work_struct *work);
285 static void fc_scsi_scan_rport(struct work_struct *work);
286
287 /*
288 * Attribute counts pre object type...
289 * Increase these values if you add attributes
290 */
291 #define FC_STARGET_NUM_ATTRS 3
292 #define FC_RPORT_NUM_ATTRS 10
293 #define FC_VPORT_NUM_ATTRS 9
294 #define FC_HOST_NUM_ATTRS 22
295
296 struct fc_internal {
297 struct scsi_transport_template t;
298 struct fc_function_template *f;
299
300 /*
301 * For attributes : each object has :
302 * An array of the actual attributes structures
303 * An array of null-terminated pointers to the attribute
304 * structures - used for mid-layer interaction.
305 *
306 * The attribute containers for the starget and host are are
307 * part of the midlayer. As the remote port is specific to the
308 * fc transport, we must provide the attribute container.
309 */
310 struct device_attribute private_starget_attrs[
311 FC_STARGET_NUM_ATTRS];
312 struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
313
314 struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
315 struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
316
317 struct transport_container rport_attr_cont;
318 struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
319 struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
320
321 struct transport_container vport_attr_cont;
322 struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
323 struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
324 };
325
326 #define to_fc_internal(tmpl) container_of(tmpl, struct fc_internal, t)
327
328 static int fc_target_setup(struct transport_container *tc, struct device *dev,
329 struct device *cdev)
330 {
331 struct scsi_target *starget = to_scsi_target(dev);
332 struct fc_rport *rport = starget_to_rport(starget);
333
334 /*
335 * if parent is remote port, use values from remote port.
336 * Otherwise, this host uses the fc_transport, but not the
337 * remote port interface. As such, initialize to known non-values.
338 */
339 if (rport) {
340 fc_starget_node_name(starget) = rport->node_name;
341 fc_starget_port_name(starget) = rport->port_name;
342 fc_starget_port_id(starget) = rport->port_id;
343 } else {
344 fc_starget_node_name(starget) = -1;
345 fc_starget_port_name(starget) = -1;
346 fc_starget_port_id(starget) = -1;
347 }
348
349 return 0;
350 }
351
352 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
353 "fc_transport",
354 fc_target_setup,
355 NULL,
356 NULL);
357
358 static int fc_host_setup(struct transport_container *tc, struct device *dev,
359 struct device *cdev)
360 {
361 struct Scsi_Host *shost = dev_to_shost(dev);
362 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
363
364 /*
365 * Set default values easily detected by the midlayer as
366 * failure cases. The scsi lldd is responsible for initializing
367 * all transport attributes to valid values per host.
368 */
369 fc_host->node_name = -1;
370 fc_host->port_name = -1;
371 fc_host->permanent_port_name = -1;
372 fc_host->supported_classes = FC_COS_UNSPECIFIED;
373 memset(fc_host->supported_fc4s, 0,
374 sizeof(fc_host->supported_fc4s));
375 fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
376 fc_host->maxframe_size = -1;
377 fc_host->max_npiv_vports = 0;
378 memset(fc_host->serial_number, 0,
379 sizeof(fc_host->serial_number));
380
381 fc_host->port_id = -1;
382 fc_host->port_type = FC_PORTTYPE_UNKNOWN;
383 fc_host->port_state = FC_PORTSTATE_UNKNOWN;
384 memset(fc_host->active_fc4s, 0,
385 sizeof(fc_host->active_fc4s));
386 fc_host->speed = FC_PORTSPEED_UNKNOWN;
387 fc_host->fabric_name = -1;
388 memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
389 memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
390
391 fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
392
393 INIT_LIST_HEAD(&fc_host->rports);
394 INIT_LIST_HEAD(&fc_host->rport_bindings);
395 INIT_LIST_HEAD(&fc_host->vports);
396 fc_host->next_rport_number = 0;
397 fc_host->next_target_id = 0;
398 fc_host->next_vport_number = 0;
399 fc_host->npiv_vports_inuse = 0;
400
401 snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
402 "fc_wq_%d", shost->host_no);
403 fc_host->work_q = create_singlethread_workqueue(
404 fc_host->work_q_name);
405 if (!fc_host->work_q)
406 return -ENOMEM;
407
408 snprintf(fc_host->devloss_work_q_name,
409 sizeof(fc_host->devloss_work_q_name),
410 "fc_dl_%d", shost->host_no);
411 fc_host->devloss_work_q = create_singlethread_workqueue(
412 fc_host->devloss_work_q_name);
413 if (!fc_host->devloss_work_q) {
414 destroy_workqueue(fc_host->work_q);
415 fc_host->work_q = NULL;
416 return -ENOMEM;
417 }
418
419 fc_bsg_hostadd(shost, fc_host);
420 /* ignore any bsg add error - we just can't do sgio */
421
422 return 0;
423 }
424
425 static int fc_host_remove(struct transport_container *tc, struct device *dev,
426 struct device *cdev)
427 {
428 struct Scsi_Host *shost = dev_to_shost(dev);
429 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
430
431 fc_bsg_remove(fc_host->rqst_q);
432 return 0;
433 }
434
435 static DECLARE_TRANSPORT_CLASS(fc_host_class,
436 "fc_host",
437 fc_host_setup,
438 fc_host_remove,
439 NULL);
440
441 /*
442 * Setup and Remove actions for remote ports are handled
443 * in the service functions below.
444 */
445 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
446 "fc_remote_ports",
447 NULL,
448 NULL,
449 NULL);
450
451 /*
452 * Setup and Remove actions for virtual ports are handled
453 * in the service functions below.
454 */
455 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
456 "fc_vports",
457 NULL,
458 NULL,
459 NULL);
460
461 /*
462 * Module Parameters
463 */
464
465 /*
466 * dev_loss_tmo: the default number of seconds that the FC transport
467 * should insulate the loss of a remote port.
468 * The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
469 */
470 static unsigned int fc_dev_loss_tmo = 60; /* seconds */
471
472 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
473 MODULE_PARM_DESC(dev_loss_tmo,
474 "Maximum number of seconds that the FC transport should"
475 " insulate the loss of a remote port. Once this value is"
476 " exceeded, the scsi target is removed. Value should be"
477 " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
478
479 /*
480 * Netlink Infrastructure
481 */
482
483 static atomic_t fc_event_seq;
484
485 /**
486 * fc_get_event_number - Obtain the next sequential FC event number
487 *
488 * Notes:
489 * We could have inlined this, but it would have required fc_event_seq to
490 * be exposed. For now, live with the subroutine call.
491 * Atomic used to avoid lock/unlock...
492 */
493 u32
494 fc_get_event_number(void)
495 {
496 return atomic_add_return(1, &fc_event_seq);
497 }
498 EXPORT_SYMBOL(fc_get_event_number);
499
500
501 /**
502 * fc_host_post_event - called to post an even on an fc_host.
503 * @shost: host the event occurred on
504 * @event_number: fc event number obtained from get_fc_event_number()
505 * @event_code: fc_host event being posted
506 * @event_data: 32bits of data for the event being posted
507 *
508 * Notes:
509 * This routine assumes no locks are held on entry.
510 */
511 void
512 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
513 enum fc_host_event_code event_code, u32 event_data)
514 {
515 struct sk_buff *skb;
516 struct nlmsghdr *nlh;
517 struct fc_nl_event *event;
518 const char *name;
519 u32 len, skblen;
520 int err;
521
522 if (!scsi_nl_sock) {
523 err = -ENOENT;
524 goto send_fail;
525 }
526
527 len = FC_NL_MSGALIGN(sizeof(*event));
528 skblen = NLMSG_SPACE(len);
529
530 skb = alloc_skb(skblen, GFP_KERNEL);
531 if (!skb) {
532 err = -ENOBUFS;
533 goto send_fail;
534 }
535
536 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
537 skblen - sizeof(*nlh), 0);
538 if (!nlh) {
539 err = -ENOBUFS;
540 goto send_fail_skb;
541 }
542 event = NLMSG_DATA(nlh);
543
544 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
545 FC_NL_ASYNC_EVENT, len);
546 event->seconds = get_seconds();
547 event->vendor_id = 0;
548 event->host_no = shost->host_no;
549 event->event_datalen = sizeof(u32); /* bytes */
550 event->event_num = event_number;
551 event->event_code = event_code;
552 event->event_data = event_data;
553
554 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
555 GFP_KERNEL);
556 return;
557
558 send_fail_skb:
559 kfree_skb(skb);
560 send_fail:
561 name = get_fc_host_event_code_name(event_code);
562 printk(KERN_WARNING
563 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
564 __func__, shost->host_no,
565 (name) ? name : "<unknown>", event_data, err);
566 return;
567 }
568 EXPORT_SYMBOL(fc_host_post_event);
569
570
571 /**
572 * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
573 * @shost: host the event occurred on
574 * @event_number: fc event number obtained from get_fc_event_number()
575 * @data_len: amount, in bytes, of vendor unique data
576 * @data_buf: pointer to vendor unique data
577 * @vendor_id: Vendor id
578 *
579 * Notes:
580 * This routine assumes no locks are held on entry.
581 */
582 void
583 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
584 u32 data_len, char * data_buf, u64 vendor_id)
585 {
586 struct sk_buff *skb;
587 struct nlmsghdr *nlh;
588 struct fc_nl_event *event;
589 u32 len, skblen;
590 int err;
591
592 if (!scsi_nl_sock) {
593 err = -ENOENT;
594 goto send_vendor_fail;
595 }
596
597 len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
598 skblen = NLMSG_SPACE(len);
599
600 skb = alloc_skb(skblen, GFP_KERNEL);
601 if (!skb) {
602 err = -ENOBUFS;
603 goto send_vendor_fail;
604 }
605
606 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
607 skblen - sizeof(*nlh), 0);
608 if (!nlh) {
609 err = -ENOBUFS;
610 goto send_vendor_fail_skb;
611 }
612 event = NLMSG_DATA(nlh);
613
614 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
615 FC_NL_ASYNC_EVENT, len);
616 event->seconds = get_seconds();
617 event->vendor_id = vendor_id;
618 event->host_no = shost->host_no;
619 event->event_datalen = data_len; /* bytes */
620 event->event_num = event_number;
621 event->event_code = FCH_EVT_VENDOR_UNIQUE;
622 memcpy(&event->event_data, data_buf, data_len);
623
624 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
625 GFP_KERNEL);
626 return;
627
628 send_vendor_fail_skb:
629 kfree_skb(skb);
630 send_vendor_fail:
631 printk(KERN_WARNING
632 "%s: Dropped Event : host %d vendor_unique - err %d\n",
633 __func__, shost->host_no, err);
634 return;
635 }
636 EXPORT_SYMBOL(fc_host_post_vendor_event);
637
638
639
640 static __init int fc_transport_init(void)
641 {
642 int error;
643
644 atomic_set(&fc_event_seq, 0);
645
646 error = transport_class_register(&fc_host_class);
647 if (error)
648 return error;
649 error = transport_class_register(&fc_vport_class);
650 if (error)
651 return error;
652 error = transport_class_register(&fc_rport_class);
653 if (error)
654 return error;
655 return transport_class_register(&fc_transport_class);
656 }
657
658 static void __exit fc_transport_exit(void)
659 {
660 transport_class_unregister(&fc_transport_class);
661 transport_class_unregister(&fc_rport_class);
662 transport_class_unregister(&fc_host_class);
663 transport_class_unregister(&fc_vport_class);
664 }
665
666 /*
667 * FC Remote Port Attribute Management
668 */
669
670 #define fc_rport_show_function(field, format_string, sz, cast) \
671 static ssize_t \
672 show_fc_rport_##field (struct device *dev, \
673 struct device_attribute *attr, char *buf) \
674 { \
675 struct fc_rport *rport = transport_class_to_rport(dev); \
676 struct Scsi_Host *shost = rport_to_shost(rport); \
677 struct fc_internal *i = to_fc_internal(shost->transportt); \
678 if ((i->f->get_rport_##field) && \
679 !((rport->port_state == FC_PORTSTATE_BLOCKED) || \
680 (rport->port_state == FC_PORTSTATE_DELETED) || \
681 (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
682 i->f->get_rport_##field(rport); \
683 return snprintf(buf, sz, format_string, cast rport->field); \
684 }
685
686 #define fc_rport_store_function(field) \
687 static ssize_t \
688 store_fc_rport_##field(struct device *dev, \
689 struct device_attribute *attr, \
690 const char *buf, size_t count) \
691 { \
692 int val; \
693 struct fc_rport *rport = transport_class_to_rport(dev); \
694 struct Scsi_Host *shost = rport_to_shost(rport); \
695 struct fc_internal *i = to_fc_internal(shost->transportt); \
696 char *cp; \
697 if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
698 (rport->port_state == FC_PORTSTATE_DELETED) || \
699 (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
700 return -EBUSY; \
701 val = simple_strtoul(buf, &cp, 0); \
702 if (*cp && (*cp != '\n')) \
703 return -EINVAL; \
704 i->f->set_rport_##field(rport, val); \
705 return count; \
706 }
707
708 #define fc_rport_rd_attr(field, format_string, sz) \
709 fc_rport_show_function(field, format_string, sz, ) \
710 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
711 show_fc_rport_##field, NULL)
712
713 #define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
714 fc_rport_show_function(field, format_string, sz, (cast)) \
715 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
716 show_fc_rport_##field, NULL)
717
718 #define fc_rport_rw_attr(field, format_string, sz) \
719 fc_rport_show_function(field, format_string, sz, ) \
720 fc_rport_store_function(field) \
721 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
722 show_fc_rport_##field, \
723 store_fc_rport_##field)
724
725
726 #define fc_private_rport_show_function(field, format_string, sz, cast) \
727 static ssize_t \
728 show_fc_rport_##field (struct device *dev, \
729 struct device_attribute *attr, char *buf) \
730 { \
731 struct fc_rport *rport = transport_class_to_rport(dev); \
732 return snprintf(buf, sz, format_string, cast rport->field); \
733 }
734
735 #define fc_private_rport_rd_attr(field, format_string, sz) \
736 fc_private_rport_show_function(field, format_string, sz, ) \
737 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
738 show_fc_rport_##field, NULL)
739
740 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
741 fc_private_rport_show_function(field, format_string, sz, (cast)) \
742 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
743 show_fc_rport_##field, NULL)
744
745
746 #define fc_private_rport_rd_enum_attr(title, maxlen) \
747 static ssize_t \
748 show_fc_rport_##title (struct device *dev, \
749 struct device_attribute *attr, char *buf) \
750 { \
751 struct fc_rport *rport = transport_class_to_rport(dev); \
752 const char *name; \
753 name = get_fc_##title##_name(rport->title); \
754 if (!name) \
755 return -EINVAL; \
756 return snprintf(buf, maxlen, "%s\n", name); \
757 } \
758 static FC_DEVICE_ATTR(rport, title, S_IRUGO, \
759 show_fc_rport_##title, NULL)
760
761
762 #define SETUP_RPORT_ATTRIBUTE_RD(field) \
763 i->private_rport_attrs[count] = device_attr_rport_##field; \
764 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
765 i->private_rport_attrs[count].store = NULL; \
766 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
767 if (i->f->show_rport_##field) \
768 count++
769
770 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
771 i->private_rport_attrs[count] = device_attr_rport_##field; \
772 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
773 i->private_rport_attrs[count].store = NULL; \
774 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
775 count++
776
777 #define SETUP_RPORT_ATTRIBUTE_RW(field) \
778 i->private_rport_attrs[count] = device_attr_rport_##field; \
779 if (!i->f->set_rport_##field) { \
780 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
781 i->private_rport_attrs[count].store = NULL; \
782 } \
783 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
784 if (i->f->show_rport_##field) \
785 count++
786
787 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
788 { \
789 i->private_rport_attrs[count] = device_attr_rport_##field; \
790 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
791 count++; \
792 }
793
794
795 /* The FC Transport Remote Port Attributes: */
796
797 /* Fixed Remote Port Attributes */
798
799 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
800
801 static ssize_t
802 show_fc_rport_supported_classes (struct device *dev,
803 struct device_attribute *attr, char *buf)
804 {
805 struct fc_rport *rport = transport_class_to_rport(dev);
806 if (rport->supported_classes == FC_COS_UNSPECIFIED)
807 return snprintf(buf, 20, "unspecified\n");
808 return get_fc_cos_names(rport->supported_classes, buf);
809 }
810 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
811 show_fc_rport_supported_classes, NULL);
812
813 /* Dynamic Remote Port Attributes */
814
815 /*
816 * dev_loss_tmo attribute
817 */
818 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
819 static ssize_t
820 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
821 const char *buf, size_t count)
822 {
823 int val;
824 struct fc_rport *rport = transport_class_to_rport(dev);
825 struct Scsi_Host *shost = rport_to_shost(rport);
826 struct fc_internal *i = to_fc_internal(shost->transportt);
827 char *cp;
828 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
829 (rport->port_state == FC_PORTSTATE_DELETED) ||
830 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
831 return -EBUSY;
832 val = simple_strtoul(buf, &cp, 0);
833 if ((*cp && (*cp != '\n')) ||
834 (val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
835 return -EINVAL;
836 i->f->set_rport_dev_loss_tmo(rport, val);
837 return count;
838 }
839 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
840 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
841
842
843 /* Private Remote Port Attributes */
844
845 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
846 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
847 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
848
849 static ssize_t
850 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
851 char *buf)
852 {
853 struct fc_rport *rport = transport_class_to_rport(dev);
854
855 /* identify any roles that are port_id specific */
856 if ((rport->port_id != -1) &&
857 (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
858 FC_WELLKNOWN_PORTID_MASK) {
859 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
860 case FC_FPORT_PORTID:
861 return snprintf(buf, 30, "Fabric Port\n");
862 case FC_FABCTLR_PORTID:
863 return snprintf(buf, 30, "Fabric Controller\n");
864 case FC_DIRSRVR_PORTID:
865 return snprintf(buf, 30, "Directory Server\n");
866 case FC_TIMESRVR_PORTID:
867 return snprintf(buf, 30, "Time Server\n");
868 case FC_MGMTSRVR_PORTID:
869 return snprintf(buf, 30, "Management Server\n");
870 default:
871 return snprintf(buf, 30, "Unknown Fabric Entity\n");
872 }
873 } else {
874 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
875 return snprintf(buf, 20, "unknown\n");
876 return get_fc_port_roles_names(rport->roles, buf);
877 }
878 }
879 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
880 show_fc_rport_roles, NULL);
881
882 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
883 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
884
885 /*
886 * fast_io_fail_tmo attribute
887 */
888 static ssize_t
889 show_fc_rport_fast_io_fail_tmo (struct device *dev,
890 struct device_attribute *attr, char *buf)
891 {
892 struct fc_rport *rport = transport_class_to_rport(dev);
893
894 if (rport->fast_io_fail_tmo == -1)
895 return snprintf(buf, 5, "off\n");
896 return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
897 }
898
899 static ssize_t
900 store_fc_rport_fast_io_fail_tmo(struct device *dev,
901 struct device_attribute *attr, const char *buf,
902 size_t count)
903 {
904 int val;
905 char *cp;
906 struct fc_rport *rport = transport_class_to_rport(dev);
907
908 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
909 (rport->port_state == FC_PORTSTATE_DELETED) ||
910 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
911 return -EBUSY;
912 if (strncmp(buf, "off", 3) == 0)
913 rport->fast_io_fail_tmo = -1;
914 else {
915 val = simple_strtoul(buf, &cp, 0);
916 if ((*cp && (*cp != '\n')) ||
917 (val < 0) || (val >= rport->dev_loss_tmo))
918 return -EINVAL;
919 rport->fast_io_fail_tmo = val;
920 }
921 return count;
922 }
923 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
924 show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
925
926
927 /*
928 * FC SCSI Target Attribute Management
929 */
930
931 /*
932 * Note: in the target show function we recognize when the remote
933 * port is in the heirarchy and do not allow the driver to get
934 * involved in sysfs functions. The driver only gets involved if
935 * it's the "old" style that doesn't use rports.
936 */
937 #define fc_starget_show_function(field, format_string, sz, cast) \
938 static ssize_t \
939 show_fc_starget_##field (struct device *dev, \
940 struct device_attribute *attr, char *buf) \
941 { \
942 struct scsi_target *starget = transport_class_to_starget(dev); \
943 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
944 struct fc_internal *i = to_fc_internal(shost->transportt); \
945 struct fc_rport *rport = starget_to_rport(starget); \
946 if (rport) \
947 fc_starget_##field(starget) = rport->field; \
948 else if (i->f->get_starget_##field) \
949 i->f->get_starget_##field(starget); \
950 return snprintf(buf, sz, format_string, \
951 cast fc_starget_##field(starget)); \
952 }
953
954 #define fc_starget_rd_attr(field, format_string, sz) \
955 fc_starget_show_function(field, format_string, sz, ) \
956 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
957 show_fc_starget_##field, NULL)
958
959 #define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
960 fc_starget_show_function(field, format_string, sz, (cast)) \
961 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
962 show_fc_starget_##field, NULL)
963
964 #define SETUP_STARGET_ATTRIBUTE_RD(field) \
965 i->private_starget_attrs[count] = device_attr_starget_##field; \
966 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
967 i->private_starget_attrs[count].store = NULL; \
968 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
969 if (i->f->show_starget_##field) \
970 count++
971
972 #define SETUP_STARGET_ATTRIBUTE_RW(field) \
973 i->private_starget_attrs[count] = device_attr_starget_##field; \
974 if (!i->f->set_starget_##field) { \
975 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
976 i->private_starget_attrs[count].store = NULL; \
977 } \
978 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
979 if (i->f->show_starget_##field) \
980 count++
981
982 /* The FC Transport SCSI Target Attributes: */
983 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
984 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
985 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
986
987
988 /*
989 * FC Virtual Port Attribute Management
990 */
991
992 #define fc_vport_show_function(field, format_string, sz, cast) \
993 static ssize_t \
994 show_fc_vport_##field (struct device *dev, \
995 struct device_attribute *attr, char *buf) \
996 { \
997 struct fc_vport *vport = transport_class_to_vport(dev); \
998 struct Scsi_Host *shost = vport_to_shost(vport); \
999 struct fc_internal *i = to_fc_internal(shost->transportt); \
1000 if ((i->f->get_vport_##field) && \
1001 !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))) \
1002 i->f->get_vport_##field(vport); \
1003 return snprintf(buf, sz, format_string, cast vport->field); \
1004 }
1005
1006 #define fc_vport_store_function(field) \
1007 static ssize_t \
1008 store_fc_vport_##field(struct device *dev, \
1009 struct device_attribute *attr, \
1010 const char *buf, size_t count) \
1011 { \
1012 int val; \
1013 struct fc_vport *vport = transport_class_to_vport(dev); \
1014 struct Scsi_Host *shost = vport_to_shost(vport); \
1015 struct fc_internal *i = to_fc_internal(shost->transportt); \
1016 char *cp; \
1017 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1018 return -EBUSY; \
1019 val = simple_strtoul(buf, &cp, 0); \
1020 if (*cp && (*cp != '\n')) \
1021 return -EINVAL; \
1022 i->f->set_vport_##field(vport, val); \
1023 return count; \
1024 }
1025
1026 #define fc_vport_store_str_function(field, slen) \
1027 static ssize_t \
1028 store_fc_vport_##field(struct device *dev, \
1029 struct device_attribute *attr, \
1030 const char *buf, size_t count) \
1031 { \
1032 struct fc_vport *vport = transport_class_to_vport(dev); \
1033 struct Scsi_Host *shost = vport_to_shost(vport); \
1034 struct fc_internal *i = to_fc_internal(shost->transportt); \
1035 unsigned int cnt=count; \
1036 \
1037 /* count may include a LF at end of string */ \
1038 if (buf[cnt-1] == '\n') \
1039 cnt--; \
1040 if (cnt > ((slen) - 1)) \
1041 return -EINVAL; \
1042 memcpy(vport->field, buf, cnt); \
1043 i->f->set_vport_##field(vport); \
1044 return count; \
1045 }
1046
1047 #define fc_vport_rd_attr(field, format_string, sz) \
1048 fc_vport_show_function(field, format_string, sz, ) \
1049 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1050 show_fc_vport_##field, NULL)
1051
1052 #define fc_vport_rd_attr_cast(field, format_string, sz, cast) \
1053 fc_vport_show_function(field, format_string, sz, (cast)) \
1054 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1055 show_fc_vport_##field, NULL)
1056
1057 #define fc_vport_rw_attr(field, format_string, sz) \
1058 fc_vport_show_function(field, format_string, sz, ) \
1059 fc_vport_store_function(field) \
1060 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1061 show_fc_vport_##field, \
1062 store_fc_vport_##field)
1063
1064 #define fc_private_vport_show_function(field, format_string, sz, cast) \
1065 static ssize_t \
1066 show_fc_vport_##field (struct device *dev, \
1067 struct device_attribute *attr, char *buf) \
1068 { \
1069 struct fc_vport *vport = transport_class_to_vport(dev); \
1070 return snprintf(buf, sz, format_string, cast vport->field); \
1071 }
1072
1073 #define fc_private_vport_store_u32_function(field) \
1074 static ssize_t \
1075 store_fc_vport_##field(struct device *dev, \
1076 struct device_attribute *attr, \
1077 const char *buf, size_t count) \
1078 { \
1079 u32 val; \
1080 struct fc_vport *vport = transport_class_to_vport(dev); \
1081 char *cp; \
1082 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1083 return -EBUSY; \
1084 val = simple_strtoul(buf, &cp, 0); \
1085 if (*cp && (*cp != '\n')) \
1086 return -EINVAL; \
1087 vport->field = val; \
1088 return count; \
1089 }
1090
1091
1092 #define fc_private_vport_rd_attr(field, format_string, sz) \
1093 fc_private_vport_show_function(field, format_string, sz, ) \
1094 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1095 show_fc_vport_##field, NULL)
1096
1097 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast) \
1098 fc_private_vport_show_function(field, format_string, sz, (cast)) \
1099 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1100 show_fc_vport_##field, NULL)
1101
1102 #define fc_private_vport_rw_u32_attr(field, format_string, sz) \
1103 fc_private_vport_show_function(field, format_string, sz, ) \
1104 fc_private_vport_store_u32_function(field) \
1105 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1106 show_fc_vport_##field, \
1107 store_fc_vport_##field)
1108
1109
1110 #define fc_private_vport_rd_enum_attr(title, maxlen) \
1111 static ssize_t \
1112 show_fc_vport_##title (struct device *dev, \
1113 struct device_attribute *attr, \
1114 char *buf) \
1115 { \
1116 struct fc_vport *vport = transport_class_to_vport(dev); \
1117 const char *name; \
1118 name = get_fc_##title##_name(vport->title); \
1119 if (!name) \
1120 return -EINVAL; \
1121 return snprintf(buf, maxlen, "%s\n", name); \
1122 } \
1123 static FC_DEVICE_ATTR(vport, title, S_IRUGO, \
1124 show_fc_vport_##title, NULL)
1125
1126
1127 #define SETUP_VPORT_ATTRIBUTE_RD(field) \
1128 i->private_vport_attrs[count] = device_attr_vport_##field; \
1129 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1130 i->private_vport_attrs[count].store = NULL; \
1131 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1132 if (i->f->get_##field) \
1133 count++
1134 /* NOTE: Above MACRO differs: checks function not show bit */
1135
1136 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field) \
1137 i->private_vport_attrs[count] = device_attr_vport_##field; \
1138 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1139 i->private_vport_attrs[count].store = NULL; \
1140 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1141 count++
1142
1143 #define SETUP_VPORT_ATTRIBUTE_WR(field) \
1144 i->private_vport_attrs[count] = device_attr_vport_##field; \
1145 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1146 if (i->f->field) \
1147 count++
1148 /* NOTE: Above MACRO differs: checks function */
1149
1150 #define SETUP_VPORT_ATTRIBUTE_RW(field) \
1151 i->private_vport_attrs[count] = device_attr_vport_##field; \
1152 if (!i->f->set_vport_##field) { \
1153 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1154 i->private_vport_attrs[count].store = NULL; \
1155 } \
1156 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1157 count++
1158 /* NOTE: Above MACRO differs: does not check show bit */
1159
1160 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field) \
1161 { \
1162 i->private_vport_attrs[count] = device_attr_vport_##field; \
1163 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1164 count++; \
1165 }
1166
1167
1168 /* The FC Transport Virtual Port Attributes: */
1169
1170 /* Fixed Virtual Port Attributes */
1171
1172 /* Dynamic Virtual Port Attributes */
1173
1174 /* Private Virtual Port Attributes */
1175
1176 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1177 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1178 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1179 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1180
1181 static ssize_t
1182 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1183 char *buf)
1184 {
1185 struct fc_vport *vport = transport_class_to_vport(dev);
1186
1187 if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1188 return snprintf(buf, 20, "unknown\n");
1189 return get_fc_port_roles_names(vport->roles, buf);
1190 }
1191 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1192
1193 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1194
1195 fc_private_vport_show_function(symbolic_name, "%s\n",
1196 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1197 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1198 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1199 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1200
1201 static ssize_t
1202 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1203 const char *buf, size_t count)
1204 {
1205 struct fc_vport *vport = transport_class_to_vport(dev);
1206 struct Scsi_Host *shost = vport_to_shost(vport);
1207
1208 fc_queue_work(shost, &vport->vport_delete_work);
1209 return count;
1210 }
1211 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1212 NULL, store_fc_vport_delete);
1213
1214
1215 /*
1216 * Enable/Disable vport
1217 * Write "1" to disable, write "0" to enable
1218 */
1219 static ssize_t
1220 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1221 const char *buf,
1222 size_t count)
1223 {
1224 struct fc_vport *vport = transport_class_to_vport(dev);
1225 struct Scsi_Host *shost = vport_to_shost(vport);
1226 struct fc_internal *i = to_fc_internal(shost->transportt);
1227 int stat;
1228
1229 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1230 return -EBUSY;
1231
1232 if (*buf == '0') {
1233 if (vport->vport_state != FC_VPORT_DISABLED)
1234 return -EALREADY;
1235 } else if (*buf == '1') {
1236 if (vport->vport_state == FC_VPORT_DISABLED)
1237 return -EALREADY;
1238 } else
1239 return -EINVAL;
1240
1241 stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1242 return stat ? stat : count;
1243 }
1244 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1245 NULL, store_fc_vport_disable);
1246
1247
1248 /*
1249 * Host Attribute Management
1250 */
1251
1252 #define fc_host_show_function(field, format_string, sz, cast) \
1253 static ssize_t \
1254 show_fc_host_##field (struct device *dev, \
1255 struct device_attribute *attr, char *buf) \
1256 { \
1257 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1258 struct fc_internal *i = to_fc_internal(shost->transportt); \
1259 if (i->f->get_host_##field) \
1260 i->f->get_host_##field(shost); \
1261 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1262 }
1263
1264 #define fc_host_store_function(field) \
1265 static ssize_t \
1266 store_fc_host_##field(struct device *dev, \
1267 struct device_attribute *attr, \
1268 const char *buf, size_t count) \
1269 { \
1270 int val; \
1271 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1272 struct fc_internal *i = to_fc_internal(shost->transportt); \
1273 char *cp; \
1274 \
1275 val = simple_strtoul(buf, &cp, 0); \
1276 if (*cp && (*cp != '\n')) \
1277 return -EINVAL; \
1278 i->f->set_host_##field(shost, val); \
1279 return count; \
1280 }
1281
1282 #define fc_host_store_str_function(field, slen) \
1283 static ssize_t \
1284 store_fc_host_##field(struct device *dev, \
1285 struct device_attribute *attr, \
1286 const char *buf, size_t count) \
1287 { \
1288 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1289 struct fc_internal *i = to_fc_internal(shost->transportt); \
1290 unsigned int cnt=count; \
1291 \
1292 /* count may include a LF at end of string */ \
1293 if (buf[cnt-1] == '\n') \
1294 cnt--; \
1295 if (cnt > ((slen) - 1)) \
1296 return -EINVAL; \
1297 memcpy(fc_host_##field(shost), buf, cnt); \
1298 i->f->set_host_##field(shost); \
1299 return count; \
1300 }
1301
1302 #define fc_host_rd_attr(field, format_string, sz) \
1303 fc_host_show_function(field, format_string, sz, ) \
1304 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1305 show_fc_host_##field, NULL)
1306
1307 #define fc_host_rd_attr_cast(field, format_string, sz, cast) \
1308 fc_host_show_function(field, format_string, sz, (cast)) \
1309 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1310 show_fc_host_##field, NULL)
1311
1312 #define fc_host_rw_attr(field, format_string, sz) \
1313 fc_host_show_function(field, format_string, sz, ) \
1314 fc_host_store_function(field) \
1315 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
1316 show_fc_host_##field, \
1317 store_fc_host_##field)
1318
1319 #define fc_host_rd_enum_attr(title, maxlen) \
1320 static ssize_t \
1321 show_fc_host_##title (struct device *dev, \
1322 struct device_attribute *attr, char *buf) \
1323 { \
1324 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1325 struct fc_internal *i = to_fc_internal(shost->transportt); \
1326 const char *name; \
1327 if (i->f->get_host_##title) \
1328 i->f->get_host_##title(shost); \
1329 name = get_fc_##title##_name(fc_host_##title(shost)); \
1330 if (!name) \
1331 return -EINVAL; \
1332 return snprintf(buf, maxlen, "%s\n", name); \
1333 } \
1334 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1335
1336 #define SETUP_HOST_ATTRIBUTE_RD(field) \
1337 i->private_host_attrs[count] = device_attr_host_##field; \
1338 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1339 i->private_host_attrs[count].store = NULL; \
1340 i->host_attrs[count] = &i->private_host_attrs[count]; \
1341 if (i->f->show_host_##field) \
1342 count++
1343
1344 #define SETUP_HOST_ATTRIBUTE_RD_NS(field) \
1345 i->private_host_attrs[count] = device_attr_host_##field; \
1346 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1347 i->private_host_attrs[count].store = NULL; \
1348 i->host_attrs[count] = &i->private_host_attrs[count]; \
1349 count++
1350
1351 #define SETUP_HOST_ATTRIBUTE_RW(field) \
1352 i->private_host_attrs[count] = device_attr_host_##field; \
1353 if (!i->f->set_host_##field) { \
1354 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1355 i->private_host_attrs[count].store = NULL; \
1356 } \
1357 i->host_attrs[count] = &i->private_host_attrs[count]; \
1358 if (i->f->show_host_##field) \
1359 count++
1360
1361
1362 #define fc_private_host_show_function(field, format_string, sz, cast) \
1363 static ssize_t \
1364 show_fc_host_##field (struct device *dev, \
1365 struct device_attribute *attr, char *buf) \
1366 { \
1367 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1368 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1369 }
1370
1371 #define fc_private_host_rd_attr(field, format_string, sz) \
1372 fc_private_host_show_function(field, format_string, sz, ) \
1373 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1374 show_fc_host_##field, NULL)
1375
1376 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
1377 fc_private_host_show_function(field, format_string, sz, (cast)) \
1378 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1379 show_fc_host_##field, NULL)
1380
1381 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
1382 i->private_host_attrs[count] = device_attr_host_##field; \
1383 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1384 i->private_host_attrs[count].store = NULL; \
1385 i->host_attrs[count] = &i->private_host_attrs[count]; \
1386 count++
1387
1388 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
1389 { \
1390 i->private_host_attrs[count] = device_attr_host_##field; \
1391 i->host_attrs[count] = &i->private_host_attrs[count]; \
1392 count++; \
1393 }
1394
1395
1396 /* Fixed Host Attributes */
1397
1398 static ssize_t
1399 show_fc_host_supported_classes (struct device *dev,
1400 struct device_attribute *attr, char *buf)
1401 {
1402 struct Scsi_Host *shost = transport_class_to_shost(dev);
1403
1404 if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1405 return snprintf(buf, 20, "unspecified\n");
1406
1407 return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1408 }
1409 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1410 show_fc_host_supported_classes, NULL);
1411
1412 static ssize_t
1413 show_fc_host_supported_fc4s (struct device *dev,
1414 struct device_attribute *attr, char *buf)
1415 {
1416 struct Scsi_Host *shost = transport_class_to_shost(dev);
1417 return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1418 }
1419 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1420 show_fc_host_supported_fc4s, NULL);
1421
1422 static ssize_t
1423 show_fc_host_supported_speeds (struct device *dev,
1424 struct device_attribute *attr, char *buf)
1425 {
1426 struct Scsi_Host *shost = transport_class_to_shost(dev);
1427
1428 if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1429 return snprintf(buf, 20, "unknown\n");
1430
1431 return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1432 }
1433 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1434 show_fc_host_supported_speeds, NULL);
1435
1436
1437 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1438 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1439 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1440 unsigned long long);
1441 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1442 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1443 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1444
1445
1446 /* Dynamic Host Attributes */
1447
1448 static ssize_t
1449 show_fc_host_active_fc4s (struct device *dev,
1450 struct device_attribute *attr, char *buf)
1451 {
1452 struct Scsi_Host *shost = transport_class_to_shost(dev);
1453 struct fc_internal *i = to_fc_internal(shost->transportt);
1454
1455 if (i->f->get_host_active_fc4s)
1456 i->f->get_host_active_fc4s(shost);
1457
1458 return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1459 }
1460 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1461 show_fc_host_active_fc4s, NULL);
1462
1463 static ssize_t
1464 show_fc_host_speed (struct device *dev,
1465 struct device_attribute *attr, char *buf)
1466 {
1467 struct Scsi_Host *shost = transport_class_to_shost(dev);
1468 struct fc_internal *i = to_fc_internal(shost->transportt);
1469
1470 if (i->f->get_host_speed)
1471 i->f->get_host_speed(shost);
1472
1473 if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1474 return snprintf(buf, 20, "unknown\n");
1475
1476 return get_fc_port_speed_names(fc_host_speed(shost), buf);
1477 }
1478 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1479 show_fc_host_speed, NULL);
1480
1481
1482 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1483 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1484 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1485 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1486 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1487
1488 fc_private_host_show_function(system_hostname, "%s\n",
1489 FC_SYMBOLIC_NAME_SIZE + 1, )
1490 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1491 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1492 show_fc_host_system_hostname, store_fc_host_system_hostname);
1493
1494
1495 /* Private Host Attributes */
1496
1497 static ssize_t
1498 show_fc_private_host_tgtid_bind_type(struct device *dev,
1499 struct device_attribute *attr, char *buf)
1500 {
1501 struct Scsi_Host *shost = transport_class_to_shost(dev);
1502 const char *name;
1503
1504 name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1505 if (!name)
1506 return -EINVAL;
1507 return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1508 }
1509
1510 #define get_list_head_entry(pos, head, member) \
1511 pos = list_entry((head)->next, typeof(*pos), member)
1512
1513 static ssize_t
1514 store_fc_private_host_tgtid_bind_type(struct device *dev,
1515 struct device_attribute *attr, const char *buf, size_t count)
1516 {
1517 struct Scsi_Host *shost = transport_class_to_shost(dev);
1518 struct fc_rport *rport;
1519 enum fc_tgtid_binding_type val;
1520 unsigned long flags;
1521
1522 if (get_fc_tgtid_bind_type_match(buf, &val))
1523 return -EINVAL;
1524
1525 /* if changing bind type, purge all unused consistent bindings */
1526 if (val != fc_host_tgtid_bind_type(shost)) {
1527 spin_lock_irqsave(shost->host_lock, flags);
1528 while (!list_empty(&fc_host_rport_bindings(shost))) {
1529 get_list_head_entry(rport,
1530 &fc_host_rport_bindings(shost), peers);
1531 list_del(&rport->peers);
1532 rport->port_state = FC_PORTSTATE_DELETED;
1533 fc_queue_work(shost, &rport->rport_delete_work);
1534 }
1535 spin_unlock_irqrestore(shost->host_lock, flags);
1536 }
1537
1538 fc_host_tgtid_bind_type(shost) = val;
1539 return count;
1540 }
1541
1542 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1543 show_fc_private_host_tgtid_bind_type,
1544 store_fc_private_host_tgtid_bind_type);
1545
1546 static ssize_t
1547 store_fc_private_host_issue_lip(struct device *dev,
1548 struct device_attribute *attr, const char *buf, size_t count)
1549 {
1550 struct Scsi_Host *shost = transport_class_to_shost(dev);
1551 struct fc_internal *i = to_fc_internal(shost->transportt);
1552 int ret;
1553
1554 /* ignore any data value written to the attribute */
1555 if (i->f->issue_fc_host_lip) {
1556 ret = i->f->issue_fc_host_lip(shost);
1557 return ret ? ret: count;
1558 }
1559
1560 return -ENOENT;
1561 }
1562
1563 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1564 store_fc_private_host_issue_lip);
1565
1566 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1567
1568
1569 /*
1570 * Host Statistics Management
1571 */
1572
1573 /* Show a given an attribute in the statistics group */
1574 static ssize_t
1575 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1576 {
1577 struct Scsi_Host *shost = transport_class_to_shost(dev);
1578 struct fc_internal *i = to_fc_internal(shost->transportt);
1579 struct fc_host_statistics *stats;
1580 ssize_t ret = -ENOENT;
1581
1582 if (offset > sizeof(struct fc_host_statistics) ||
1583 offset % sizeof(u64) != 0)
1584 WARN_ON(1);
1585
1586 if (i->f->get_fc_host_stats) {
1587 stats = (i->f->get_fc_host_stats)(shost);
1588 if (stats)
1589 ret = snprintf(buf, 20, "0x%llx\n",
1590 (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1591 }
1592 return ret;
1593 }
1594
1595
1596 /* generate a read-only statistics attribute */
1597 #define fc_host_statistic(name) \
1598 static ssize_t show_fcstat_##name(struct device *cd, \
1599 struct device_attribute *attr, \
1600 char *buf) \
1601 { \
1602 return fc_stat_show(cd, buf, \
1603 offsetof(struct fc_host_statistics, name)); \
1604 } \
1605 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1606
1607 fc_host_statistic(seconds_since_last_reset);
1608 fc_host_statistic(tx_frames);
1609 fc_host_statistic(tx_words);
1610 fc_host_statistic(rx_frames);
1611 fc_host_statistic(rx_words);
1612 fc_host_statistic(lip_count);
1613 fc_host_statistic(nos_count);
1614 fc_host_statistic(error_frames);
1615 fc_host_statistic(dumped_frames);
1616 fc_host_statistic(link_failure_count);
1617 fc_host_statistic(loss_of_sync_count);
1618 fc_host_statistic(loss_of_signal_count);
1619 fc_host_statistic(prim_seq_protocol_err_count);
1620 fc_host_statistic(invalid_tx_word_count);
1621 fc_host_statistic(invalid_crc_count);
1622 fc_host_statistic(fcp_input_requests);
1623 fc_host_statistic(fcp_output_requests);
1624 fc_host_statistic(fcp_control_requests);
1625 fc_host_statistic(fcp_input_megabytes);
1626 fc_host_statistic(fcp_output_megabytes);
1627
1628 static ssize_t
1629 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1630 const char *buf, size_t count)
1631 {
1632 struct Scsi_Host *shost = transport_class_to_shost(dev);
1633 struct fc_internal *i = to_fc_internal(shost->transportt);
1634
1635 /* ignore any data value written to the attribute */
1636 if (i->f->reset_fc_host_stats) {
1637 i->f->reset_fc_host_stats(shost);
1638 return count;
1639 }
1640
1641 return -ENOENT;
1642 }
1643 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1644 fc_reset_statistics);
1645
1646 static struct attribute *fc_statistics_attrs[] = {
1647 &device_attr_host_seconds_since_last_reset.attr,
1648 &device_attr_host_tx_frames.attr,
1649 &device_attr_host_tx_words.attr,
1650 &device_attr_host_rx_frames.attr,
1651 &device_attr_host_rx_words.attr,
1652 &device_attr_host_lip_count.attr,
1653 &device_attr_host_nos_count.attr,
1654 &device_attr_host_error_frames.attr,
1655 &device_attr_host_dumped_frames.attr,
1656 &device_attr_host_link_failure_count.attr,
1657 &device_attr_host_loss_of_sync_count.attr,
1658 &device_attr_host_loss_of_signal_count.attr,
1659 &device_attr_host_prim_seq_protocol_err_count.attr,
1660 &device_attr_host_invalid_tx_word_count.attr,
1661 &device_attr_host_invalid_crc_count.attr,
1662 &device_attr_host_fcp_input_requests.attr,
1663 &device_attr_host_fcp_output_requests.attr,
1664 &device_attr_host_fcp_control_requests.attr,
1665 &device_attr_host_fcp_input_megabytes.attr,
1666 &device_attr_host_fcp_output_megabytes.attr,
1667 &device_attr_host_reset_statistics.attr,
1668 NULL
1669 };
1670
1671 static struct attribute_group fc_statistics_group = {
1672 .name = "statistics",
1673 .attrs = fc_statistics_attrs,
1674 };
1675
1676
1677 /* Host Vport Attributes */
1678
1679 static int
1680 fc_parse_wwn(const char *ns, u64 *nm)
1681 {
1682 unsigned int i, j;
1683 u8 wwn[8];
1684
1685 memset(wwn, 0, sizeof(wwn));
1686
1687 /* Validate and store the new name */
1688 for (i=0, j=0; i < 16; i++) {
1689 if ((*ns >= 'a') && (*ns <= 'f'))
1690 j = ((j << 4) | ((*ns++ -'a') + 10));
1691 else if ((*ns >= 'A') && (*ns <= 'F'))
1692 j = ((j << 4) | ((*ns++ -'A') + 10));
1693 else if ((*ns >= '0') && (*ns <= '9'))
1694 j = ((j << 4) | (*ns++ -'0'));
1695 else
1696 return -EINVAL;
1697 if (i % 2) {
1698 wwn[i/2] = j & 0xff;
1699 j = 0;
1700 }
1701 }
1702
1703 *nm = wwn_to_u64(wwn);
1704
1705 return 0;
1706 }
1707
1708
1709 /*
1710 * "Short-cut" sysfs variable to create a new vport on a FC Host.
1711 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1712 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1713 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1714 */
1715 static ssize_t
1716 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1717 const char *buf, size_t count)
1718 {
1719 struct Scsi_Host *shost = transport_class_to_shost(dev);
1720 struct fc_vport_identifiers vid;
1721 struct fc_vport *vport;
1722 unsigned int cnt=count;
1723 int stat;
1724
1725 memset(&vid, 0, sizeof(vid));
1726
1727 /* count may include a LF at end of string */
1728 if (buf[cnt-1] == '\n')
1729 cnt--;
1730
1731 /* validate we have enough characters for WWPN */
1732 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1733 return -EINVAL;
1734
1735 stat = fc_parse_wwn(&buf[0], &vid.port_name);
1736 if (stat)
1737 return stat;
1738
1739 stat = fc_parse_wwn(&buf[17], &vid.node_name);
1740 if (stat)
1741 return stat;
1742
1743 vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1744 vid.vport_type = FC_PORTTYPE_NPIV;
1745 /* vid.symbolic_name is already zero/NULL's */
1746 vid.disable = false; /* always enabled */
1747
1748 /* we only allow support on Channel 0 !!! */
1749 stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1750 return stat ? stat : count;
1751 }
1752 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1753 store_fc_host_vport_create);
1754
1755
1756 /*
1757 * "Short-cut" sysfs variable to delete a vport on a FC Host.
1758 * Vport is identified by a string containing "<WWPN>:<WWNN>".
1759 * The WWNs are specified as hex characters, and may *not* contain
1760 * any prefixes (e.g. 0x, x, etc)
1761 */
1762 static ssize_t
1763 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1764 const char *buf, size_t count)
1765 {
1766 struct Scsi_Host *shost = transport_class_to_shost(dev);
1767 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1768 struct fc_vport *vport;
1769 u64 wwpn, wwnn;
1770 unsigned long flags;
1771 unsigned int cnt=count;
1772 int stat, match;
1773
1774 /* count may include a LF at end of string */
1775 if (buf[cnt-1] == '\n')
1776 cnt--;
1777
1778 /* validate we have enough characters for WWPN */
1779 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1780 return -EINVAL;
1781
1782 stat = fc_parse_wwn(&buf[0], &wwpn);
1783 if (stat)
1784 return stat;
1785
1786 stat = fc_parse_wwn(&buf[17], &wwnn);
1787 if (stat)
1788 return stat;
1789
1790 spin_lock_irqsave(shost->host_lock, flags);
1791 match = 0;
1792 /* we only allow support on Channel 0 !!! */
1793 list_for_each_entry(vport, &fc_host->vports, peers) {
1794 if ((vport->channel == 0) &&
1795 (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1796 match = 1;
1797 break;
1798 }
1799 }
1800 spin_unlock_irqrestore(shost->host_lock, flags);
1801
1802 if (!match)
1803 return -ENODEV;
1804
1805 stat = fc_vport_terminate(vport);
1806 return stat ? stat : count;
1807 }
1808 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1809 store_fc_host_vport_delete);
1810
1811
1812 static int fc_host_match(struct attribute_container *cont,
1813 struct device *dev)
1814 {
1815 struct Scsi_Host *shost;
1816 struct fc_internal *i;
1817
1818 if (!scsi_is_host_device(dev))
1819 return 0;
1820
1821 shost = dev_to_shost(dev);
1822 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1823 != &fc_host_class.class)
1824 return 0;
1825
1826 i = to_fc_internal(shost->transportt);
1827
1828 return &i->t.host_attrs.ac == cont;
1829 }
1830
1831 static int fc_target_match(struct attribute_container *cont,
1832 struct device *dev)
1833 {
1834 struct Scsi_Host *shost;
1835 struct fc_internal *i;
1836
1837 if (!scsi_is_target_device(dev))
1838 return 0;
1839
1840 shost = dev_to_shost(dev->parent);
1841 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1842 != &fc_host_class.class)
1843 return 0;
1844
1845 i = to_fc_internal(shost->transportt);
1846
1847 return &i->t.target_attrs.ac == cont;
1848 }
1849
1850 static void fc_rport_dev_release(struct device *dev)
1851 {
1852 struct fc_rport *rport = dev_to_rport(dev);
1853 put_device(dev->parent);
1854 kfree(rport);
1855 }
1856
1857 int scsi_is_fc_rport(const struct device *dev)
1858 {
1859 return dev->release == fc_rport_dev_release;
1860 }
1861 EXPORT_SYMBOL(scsi_is_fc_rport);
1862
1863 static int fc_rport_match(struct attribute_container *cont,
1864 struct device *dev)
1865 {
1866 struct Scsi_Host *shost;
1867 struct fc_internal *i;
1868
1869 if (!scsi_is_fc_rport(dev))
1870 return 0;
1871
1872 shost = dev_to_shost(dev->parent);
1873 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1874 != &fc_host_class.class)
1875 return 0;
1876
1877 i = to_fc_internal(shost->transportt);
1878
1879 return &i->rport_attr_cont.ac == cont;
1880 }
1881
1882
1883 static void fc_vport_dev_release(struct device *dev)
1884 {
1885 struct fc_vport *vport = dev_to_vport(dev);
1886 put_device(dev->parent); /* release kobj parent */
1887 kfree(vport);
1888 }
1889
1890 int scsi_is_fc_vport(const struct device *dev)
1891 {
1892 return dev->release == fc_vport_dev_release;
1893 }
1894 EXPORT_SYMBOL(scsi_is_fc_vport);
1895
1896 static int fc_vport_match(struct attribute_container *cont,
1897 struct device *dev)
1898 {
1899 struct fc_vport *vport;
1900 struct Scsi_Host *shost;
1901 struct fc_internal *i;
1902
1903 if (!scsi_is_fc_vport(dev))
1904 return 0;
1905 vport = dev_to_vport(dev);
1906
1907 shost = vport_to_shost(vport);
1908 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1909 != &fc_host_class.class)
1910 return 0;
1911
1912 i = to_fc_internal(shost->transportt);
1913 return &i->vport_attr_cont.ac == cont;
1914 }
1915
1916
1917 /**
1918 * fc_timed_out - FC Transport I/O timeout intercept handler
1919 * @scmd: The SCSI command which timed out
1920 *
1921 * This routine protects against error handlers getting invoked while a
1922 * rport is in a blocked state, typically due to a temporarily loss of
1923 * connectivity. If the error handlers are allowed to proceed, requests
1924 * to abort i/o, reset the target, etc will likely fail as there is no way
1925 * to communicate with the device to perform the requested function. These
1926 * failures may result in the midlayer taking the device offline, requiring
1927 * manual intervention to restore operation.
1928 *
1929 * This routine, called whenever an i/o times out, validates the state of
1930 * the underlying rport. If the rport is blocked, it returns
1931 * EH_RESET_TIMER, which will continue to reschedule the timeout.
1932 * Eventually, either the device will return, or devloss_tmo will fire,
1933 * and when the timeout then fires, it will be handled normally.
1934 * If the rport is not blocked, normal error handling continues.
1935 *
1936 * Notes:
1937 * This routine assumes no locks are held on entry.
1938 */
1939 static enum blk_eh_timer_return
1940 fc_timed_out(struct scsi_cmnd *scmd)
1941 {
1942 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1943
1944 if (rport->port_state == FC_PORTSTATE_BLOCKED)
1945 return BLK_EH_RESET_TIMER;
1946
1947 return BLK_EH_NOT_HANDLED;
1948 }
1949
1950 /*
1951 * Called by fc_user_scan to locate an rport on the shost that
1952 * matches the channel and target id, and invoke scsi_scan_target()
1953 * on the rport.
1954 */
1955 static void
1956 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1957 {
1958 struct fc_rport *rport;
1959 unsigned long flags;
1960
1961 spin_lock_irqsave(shost->host_lock, flags);
1962
1963 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1964 if (rport->scsi_target_id == -1)
1965 continue;
1966
1967 if (rport->port_state != FC_PORTSTATE_ONLINE)
1968 continue;
1969
1970 if ((channel == rport->channel) &&
1971 (id == rport->scsi_target_id)) {
1972 spin_unlock_irqrestore(shost->host_lock, flags);
1973 scsi_scan_target(&rport->dev, channel, id, lun, 1);
1974 return;
1975 }
1976 }
1977
1978 spin_unlock_irqrestore(shost->host_lock, flags);
1979 }
1980
1981 /*
1982 * Called via sysfs scan routines. Necessary, as the FC transport
1983 * wants to place all target objects below the rport object. So this
1984 * routine must invoke the scsi_scan_target() routine with the rport
1985 * object as the parent.
1986 */
1987 static int
1988 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1989 {
1990 uint chlo, chhi;
1991 uint tgtlo, tgthi;
1992
1993 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
1994 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
1995 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1996 return -EINVAL;
1997
1998 if (channel == SCAN_WILD_CARD) {
1999 chlo = 0;
2000 chhi = shost->max_channel + 1;
2001 } else {
2002 chlo = channel;
2003 chhi = channel + 1;
2004 }
2005
2006 if (id == SCAN_WILD_CARD) {
2007 tgtlo = 0;
2008 tgthi = shost->max_id;
2009 } else {
2010 tgtlo = id;
2011 tgthi = id + 1;
2012 }
2013
2014 for ( ; chlo < chhi; chlo++)
2015 for ( ; tgtlo < tgthi; tgtlo++)
2016 fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2017
2018 return 0;
2019 }
2020
2021 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2022 int result)
2023 {
2024 struct fc_internal *i = to_fc_internal(shost->transportt);
2025 return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2026 }
2027
2028 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2029 {
2030 struct fc_internal *i = to_fc_internal(shost->transportt);
2031 return i->f->it_nexus_response(shost, nexus, result);
2032 }
2033
2034 struct scsi_transport_template *
2035 fc_attach_transport(struct fc_function_template *ft)
2036 {
2037 int count;
2038 struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2039 GFP_KERNEL);
2040
2041 if (unlikely(!i))
2042 return NULL;
2043
2044 i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2045 i->t.target_attrs.ac.class = &fc_transport_class.class;
2046 i->t.target_attrs.ac.match = fc_target_match;
2047 i->t.target_size = sizeof(struct fc_starget_attrs);
2048 transport_container_register(&i->t.target_attrs);
2049
2050 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2051 i->t.host_attrs.ac.class = &fc_host_class.class;
2052 i->t.host_attrs.ac.match = fc_host_match;
2053 i->t.host_size = sizeof(struct fc_host_attrs);
2054 if (ft->get_fc_host_stats)
2055 i->t.host_attrs.statistics = &fc_statistics_group;
2056 transport_container_register(&i->t.host_attrs);
2057
2058 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2059 i->rport_attr_cont.ac.class = &fc_rport_class.class;
2060 i->rport_attr_cont.ac.match = fc_rport_match;
2061 transport_container_register(&i->rport_attr_cont);
2062
2063 i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2064 i->vport_attr_cont.ac.class = &fc_vport_class.class;
2065 i->vport_attr_cont.ac.match = fc_vport_match;
2066 transport_container_register(&i->vport_attr_cont);
2067
2068 i->f = ft;
2069
2070 /* Transport uses the shost workq for scsi scanning */
2071 i->t.create_work_queue = 1;
2072
2073 i->t.eh_timed_out = fc_timed_out;
2074
2075 i->t.user_scan = fc_user_scan;
2076
2077 /* target-mode drivers' functions */
2078 i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2079 i->t.it_nexus_response = fc_it_nexus_response;
2080
2081 /*
2082 * Setup SCSI Target Attributes.
2083 */
2084 count = 0;
2085 SETUP_STARGET_ATTRIBUTE_RD(node_name);
2086 SETUP_STARGET_ATTRIBUTE_RD(port_name);
2087 SETUP_STARGET_ATTRIBUTE_RD(port_id);
2088
2089 BUG_ON(count > FC_STARGET_NUM_ATTRS);
2090
2091 i->starget_attrs[count] = NULL;
2092
2093
2094 /*
2095 * Setup SCSI Host Attributes.
2096 */
2097 count=0;
2098 SETUP_HOST_ATTRIBUTE_RD(node_name);
2099 SETUP_HOST_ATTRIBUTE_RD(port_name);
2100 SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2101 SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2102 SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2103 SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2104 SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2105 if (ft->vport_create) {
2106 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2107 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2108 }
2109 SETUP_HOST_ATTRIBUTE_RD(serial_number);
2110
2111 SETUP_HOST_ATTRIBUTE_RD(port_id);
2112 SETUP_HOST_ATTRIBUTE_RD(port_type);
2113 SETUP_HOST_ATTRIBUTE_RD(port_state);
2114 SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2115 SETUP_HOST_ATTRIBUTE_RD(speed);
2116 SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2117 SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2118 SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2119
2120 /* Transport-managed attributes */
2121 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2122 if (ft->issue_fc_host_lip)
2123 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2124 if (ft->vport_create)
2125 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2126 if (ft->vport_delete)
2127 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2128
2129 BUG_ON(count > FC_HOST_NUM_ATTRS);
2130
2131 i->host_attrs[count] = NULL;
2132
2133 /*
2134 * Setup Remote Port Attributes.
2135 */
2136 count=0;
2137 SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2138 SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2139 SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2140 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2141 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2142 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2143 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2144 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2145 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2146 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2147
2148 BUG_ON(count > FC_RPORT_NUM_ATTRS);
2149
2150 i->rport_attrs[count] = NULL;
2151
2152 /*
2153 * Setup Virtual Port Attributes.
2154 */
2155 count=0;
2156 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2157 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2158 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2159 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2160 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2161 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2162 SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2163 SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2164 SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2165
2166 BUG_ON(count > FC_VPORT_NUM_ATTRS);
2167
2168 i->vport_attrs[count] = NULL;
2169
2170 return &i->t;
2171 }
2172 EXPORT_SYMBOL(fc_attach_transport);
2173
2174 void fc_release_transport(struct scsi_transport_template *t)
2175 {
2176 struct fc_internal *i = to_fc_internal(t);
2177
2178 transport_container_unregister(&i->t.target_attrs);
2179 transport_container_unregister(&i->t.host_attrs);
2180 transport_container_unregister(&i->rport_attr_cont);
2181 transport_container_unregister(&i->vport_attr_cont);
2182
2183 kfree(i);
2184 }
2185 EXPORT_SYMBOL(fc_release_transport);
2186
2187 /**
2188 * fc_queue_work - Queue work to the fc_host workqueue.
2189 * @shost: Pointer to Scsi_Host bound to fc_host.
2190 * @work: Work to queue for execution.
2191 *
2192 * Return value:
2193 * 1 - work queued for execution
2194 * 0 - work is already queued
2195 * -EINVAL - work queue doesn't exist
2196 */
2197 static int
2198 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2199 {
2200 if (unlikely(!fc_host_work_q(shost))) {
2201 printk(KERN_ERR
2202 "ERROR: FC host '%s' attempted to queue work, "
2203 "when no workqueue created.\n", shost->hostt->name);
2204 dump_stack();
2205
2206 return -EINVAL;
2207 }
2208
2209 return queue_work(fc_host_work_q(shost), work);
2210 }
2211
2212 /**
2213 * fc_flush_work - Flush a fc_host's workqueue.
2214 * @shost: Pointer to Scsi_Host bound to fc_host.
2215 */
2216 static void
2217 fc_flush_work(struct Scsi_Host *shost)
2218 {
2219 if (!fc_host_work_q(shost)) {
2220 printk(KERN_ERR
2221 "ERROR: FC host '%s' attempted to flush work, "
2222 "when no workqueue created.\n", shost->hostt->name);
2223 dump_stack();
2224 return;
2225 }
2226
2227 flush_workqueue(fc_host_work_q(shost));
2228 }
2229
2230 /**
2231 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2232 * @shost: Pointer to Scsi_Host bound to fc_host.
2233 * @work: Work to queue for execution.
2234 * @delay: jiffies to delay the work queuing
2235 *
2236 * Return value:
2237 * 1 on success / 0 already queued / < 0 for error
2238 */
2239 static int
2240 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2241 unsigned long delay)
2242 {
2243 if (unlikely(!fc_host_devloss_work_q(shost))) {
2244 printk(KERN_ERR
2245 "ERROR: FC host '%s' attempted to queue work, "
2246 "when no workqueue created.\n", shost->hostt->name);
2247 dump_stack();
2248
2249 return -EINVAL;
2250 }
2251
2252 return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2253 }
2254
2255 /**
2256 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2257 * @shost: Pointer to Scsi_Host bound to fc_host.
2258 */
2259 static void
2260 fc_flush_devloss(struct Scsi_Host *shost)
2261 {
2262 if (!fc_host_devloss_work_q(shost)) {
2263 printk(KERN_ERR
2264 "ERROR: FC host '%s' attempted to flush work, "
2265 "when no workqueue created.\n", shost->hostt->name);
2266 dump_stack();
2267 return;
2268 }
2269
2270 flush_workqueue(fc_host_devloss_work_q(shost));
2271 }
2272
2273
2274 /**
2275 * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2276 * @shost: Which &Scsi_Host
2277 *
2278 * This routine is expected to be called immediately preceeding the
2279 * a driver's call to scsi_remove_host().
2280 *
2281 * WARNING: A driver utilizing the fc_transport, which fails to call
2282 * this routine prior to scsi_remove_host(), will leave dangling
2283 * objects in /sys/class/fc_remote_ports. Access to any of these
2284 * objects can result in a system crash !!!
2285 *
2286 * Notes:
2287 * This routine assumes no locks are held on entry.
2288 */
2289 void
2290 fc_remove_host(struct Scsi_Host *shost)
2291 {
2292 struct fc_vport *vport = NULL, *next_vport = NULL;
2293 struct fc_rport *rport = NULL, *next_rport = NULL;
2294 struct workqueue_struct *work_q;
2295 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2296 unsigned long flags;
2297
2298 spin_lock_irqsave(shost->host_lock, flags);
2299
2300 /* Remove any vports */
2301 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2302 fc_queue_work(shost, &vport->vport_delete_work);
2303
2304 /* Remove any remote ports */
2305 list_for_each_entry_safe(rport, next_rport,
2306 &fc_host->rports, peers) {
2307 list_del(&rport->peers);
2308 rport->port_state = FC_PORTSTATE_DELETED;
2309 fc_queue_work(shost, &rport->rport_delete_work);
2310 }
2311
2312 list_for_each_entry_safe(rport, next_rport,
2313 &fc_host->rport_bindings, peers) {
2314 list_del(&rport->peers);
2315 rport->port_state = FC_PORTSTATE_DELETED;
2316 fc_queue_work(shost, &rport->rport_delete_work);
2317 }
2318
2319 spin_unlock_irqrestore(shost->host_lock, flags);
2320
2321 /* flush all scan work items */
2322 scsi_flush_work(shost);
2323
2324 /* flush all stgt delete, and rport delete work items, then kill it */
2325 if (fc_host->work_q) {
2326 work_q = fc_host->work_q;
2327 fc_host->work_q = NULL;
2328 destroy_workqueue(work_q);
2329 }
2330
2331 /* flush all devloss work items, then kill it */
2332 if (fc_host->devloss_work_q) {
2333 work_q = fc_host->devloss_work_q;
2334 fc_host->devloss_work_q = NULL;
2335 destroy_workqueue(work_q);
2336 }
2337 }
2338 EXPORT_SYMBOL(fc_remove_host);
2339
2340 static void fc_terminate_rport_io(struct fc_rport *rport)
2341 {
2342 struct Scsi_Host *shost = rport_to_shost(rport);
2343 struct fc_internal *i = to_fc_internal(shost->transportt);
2344
2345 /* Involve the LLDD if possible to terminate all io on the rport. */
2346 if (i->f->terminate_rport_io)
2347 i->f->terminate_rport_io(rport);
2348
2349 /*
2350 * must unblock to flush queued IO. The caller will have set
2351 * the port_state or flags, so that fc_remote_port_chkready will
2352 * fail IO.
2353 */
2354 scsi_target_unblock(&rport->dev);
2355 }
2356
2357 /**
2358 * fc_starget_delete - called to delete the scsi decendents of an rport
2359 * @work: remote port to be operated on.
2360 *
2361 * Deletes target and all sdevs.
2362 */
2363 static void
2364 fc_starget_delete(struct work_struct *work)
2365 {
2366 struct fc_rport *rport =
2367 container_of(work, struct fc_rport, stgt_delete_work);
2368
2369 fc_terminate_rport_io(rport);
2370 scsi_remove_target(&rport->dev);
2371 }
2372
2373
2374 /**
2375 * fc_rport_final_delete - finish rport termination and delete it.
2376 * @work: remote port to be deleted.
2377 */
2378 static void
2379 fc_rport_final_delete(struct work_struct *work)
2380 {
2381 struct fc_rport *rport =
2382 container_of(work, struct fc_rport, rport_delete_work);
2383 struct device *dev = &rport->dev;
2384 struct Scsi_Host *shost = rport_to_shost(rport);
2385 struct fc_internal *i = to_fc_internal(shost->transportt);
2386 unsigned long flags;
2387
2388 /*
2389 * if a scan is pending, flush the SCSI Host work_q so that
2390 * that we can reclaim the rport scan work element.
2391 */
2392 if (rport->flags & FC_RPORT_SCAN_PENDING)
2393 scsi_flush_work(shost);
2394
2395 fc_terminate_rport_io(rport);
2396
2397 /*
2398 * Cancel any outstanding timers. These should really exist
2399 * only when rmmod'ing the LLDD and we're asking for
2400 * immediate termination of the rports
2401 */
2402 spin_lock_irqsave(shost->host_lock, flags);
2403 if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2404 spin_unlock_irqrestore(shost->host_lock, flags);
2405 if (!cancel_delayed_work(&rport->fail_io_work))
2406 fc_flush_devloss(shost);
2407 if (!cancel_delayed_work(&rport->dev_loss_work))
2408 fc_flush_devloss(shost);
2409 spin_lock_irqsave(shost->host_lock, flags);
2410 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2411 }
2412 spin_unlock_irqrestore(shost->host_lock, flags);
2413
2414 /* Delete SCSI target and sdevs */
2415 if (rport->scsi_target_id != -1)
2416 fc_starget_delete(&rport->stgt_delete_work);
2417
2418 /*
2419 * Notify the driver that the rport is now dead. The LLDD will
2420 * also guarantee that any communication to the rport is terminated
2421 *
2422 * Avoid this call if we already called it when we preserved the
2423 * rport for the binding.
2424 */
2425 if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2426 (i->f->dev_loss_tmo_callbk))
2427 i->f->dev_loss_tmo_callbk(rport);
2428
2429 fc_bsg_remove(rport->rqst_q);
2430
2431 transport_remove_device(dev);
2432 device_del(dev);
2433 transport_destroy_device(dev);
2434 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2435 put_device(dev); /* for self-reference */
2436 }
2437
2438
2439 /**
2440 * fc_rport_create - allocates and creates a remote FC port.
2441 * @shost: scsi host the remote port is connected to.
2442 * @channel: Channel on shost port connected to.
2443 * @ids: The world wide names, fc address, and FC4 port
2444 * roles for the remote port.
2445 *
2446 * Allocates and creates the remoter port structure, including the
2447 * class and sysfs creation.
2448 *
2449 * Notes:
2450 * This routine assumes no locks are held on entry.
2451 */
2452 static struct fc_rport *
2453 fc_rport_create(struct Scsi_Host *shost, int channel,
2454 struct fc_rport_identifiers *ids)
2455 {
2456 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2457 struct fc_internal *fci = to_fc_internal(shost->transportt);
2458 struct fc_rport *rport;
2459 struct device *dev;
2460 unsigned long flags;
2461 int error;
2462 size_t size;
2463
2464 size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2465 rport = kzalloc(size, GFP_KERNEL);
2466 if (unlikely(!rport)) {
2467 printk(KERN_ERR "%s: allocation failure\n", __func__);
2468 return NULL;
2469 }
2470
2471 rport->maxframe_size = -1;
2472 rport->supported_classes = FC_COS_UNSPECIFIED;
2473 rport->dev_loss_tmo = fc_dev_loss_tmo;
2474 memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2475 memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2476 rport->port_id = ids->port_id;
2477 rport->roles = ids->roles;
2478 rport->port_state = FC_PORTSTATE_ONLINE;
2479 if (fci->f->dd_fcrport_size)
2480 rport->dd_data = &rport[1];
2481 rport->channel = channel;
2482 rport->fast_io_fail_tmo = -1;
2483
2484 INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2485 INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2486 INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2487 INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2488 INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2489
2490 spin_lock_irqsave(shost->host_lock, flags);
2491
2492 rport->number = fc_host->next_rport_number++;
2493 if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2494 rport->scsi_target_id = fc_host->next_target_id++;
2495 else
2496 rport->scsi_target_id = -1;
2497 list_add_tail(&rport->peers, &fc_host->rports);
2498 get_device(&shost->shost_gendev); /* for fc_host->rport list */
2499
2500 spin_unlock_irqrestore(shost->host_lock, flags);
2501
2502 dev = &rport->dev;
2503 device_initialize(dev); /* takes self reference */
2504 dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2505 dev->release = fc_rport_dev_release;
2506 dev_set_name(dev, "rport-%d:%d-%d",
2507 shost->host_no, channel, rport->number);
2508 transport_setup_device(dev);
2509
2510 error = device_add(dev);
2511 if (error) {
2512 printk(KERN_ERR "FC Remote Port device_add failed\n");
2513 goto delete_rport;
2514 }
2515 transport_add_device(dev);
2516 transport_configure_device(dev);
2517
2518 fc_bsg_rportadd(shost, rport);
2519 /* ignore any bsg add error - we just can't do sgio */
2520
2521 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2522 /* initiate a scan of the target */
2523 rport->flags |= FC_RPORT_SCAN_PENDING;
2524 scsi_queue_work(shost, &rport->scan_work);
2525 }
2526
2527 return rport;
2528
2529 delete_rport:
2530 transport_destroy_device(dev);
2531 spin_lock_irqsave(shost->host_lock, flags);
2532 list_del(&rport->peers);
2533 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2534 spin_unlock_irqrestore(shost->host_lock, flags);
2535 put_device(dev->parent);
2536 kfree(rport);
2537 return NULL;
2538 }
2539
2540 /**
2541 * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2542 * @shost: scsi host the remote port is connected to.
2543 * @channel: Channel on shost port connected to.
2544 * @ids: The world wide names, fc address, and FC4 port
2545 * roles for the remote port.
2546 *
2547 * The LLDD calls this routine to notify the transport of the existence
2548 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2549 * of the port, it's FC address (port_id), and the FC4 roles that are
2550 * active for the port.
2551 *
2552 * For ports that are FCP targets (aka scsi targets), the FC transport
2553 * maintains consistent target id bindings on behalf of the LLDD.
2554 * A consistent target id binding is an assignment of a target id to
2555 * a remote port identifier, which persists while the scsi host is
2556 * attached. The remote port can disappear, then later reappear, and
2557 * it's target id assignment remains the same. This allows for shifts
2558 * in FC addressing (if binding by wwpn or wwnn) with no apparent
2559 * changes to the scsi subsystem which is based on scsi host number and
2560 * target id values. Bindings are only valid during the attachment of
2561 * the scsi host. If the host detaches, then later re-attaches, target
2562 * id bindings may change.
2563 *
2564 * This routine is responsible for returning a remote port structure.
2565 * The routine will search the list of remote ports it maintains
2566 * internally on behalf of consistent target id mappings. If found, the
2567 * remote port structure will be reused. Otherwise, a new remote port
2568 * structure will be allocated.
2569 *
2570 * Whenever a remote port is allocated, a new fc_remote_port class
2571 * device is created.
2572 *
2573 * Should not be called from interrupt context.
2574 *
2575 * Notes:
2576 * This routine assumes no locks are held on entry.
2577 */
2578 struct fc_rport *
2579 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2580 struct fc_rport_identifiers *ids)
2581 {
2582 struct fc_internal *fci = to_fc_internal(shost->transportt);
2583 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2584 struct fc_rport *rport;
2585 unsigned long flags;
2586 int match = 0;
2587
2588 /* ensure any stgt delete functions are done */
2589 fc_flush_work(shost);
2590
2591 /*
2592 * Search the list of "active" rports, for an rport that has been
2593 * deleted, but we've held off the real delete while the target
2594 * is in a "blocked" state.
2595 */
2596 spin_lock_irqsave(shost->host_lock, flags);
2597
2598 list_for_each_entry(rport, &fc_host->rports, peers) {
2599
2600 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2601 (rport->channel == channel)) {
2602
2603 switch (fc_host->tgtid_bind_type) {
2604 case FC_TGTID_BIND_BY_WWPN:
2605 case FC_TGTID_BIND_NONE:
2606 if (rport->port_name == ids->port_name)
2607 match = 1;
2608 break;
2609 case FC_TGTID_BIND_BY_WWNN:
2610 if (rport->node_name == ids->node_name)
2611 match = 1;
2612 break;
2613 case FC_TGTID_BIND_BY_ID:
2614 if (rport->port_id == ids->port_id)
2615 match = 1;
2616 break;
2617 }
2618
2619 if (match) {
2620
2621 memcpy(&rport->node_name, &ids->node_name,
2622 sizeof(rport->node_name));
2623 memcpy(&rport->port_name, &ids->port_name,
2624 sizeof(rport->port_name));
2625 rport->port_id = ids->port_id;
2626
2627 rport->port_state = FC_PORTSTATE_ONLINE;
2628 rport->roles = ids->roles;
2629
2630 spin_unlock_irqrestore(shost->host_lock, flags);
2631
2632 if (fci->f->dd_fcrport_size)
2633 memset(rport->dd_data, 0,
2634 fci->f->dd_fcrport_size);
2635
2636 /*
2637 * If we were not a target, cancel the
2638 * io terminate and rport timers, and
2639 * we're done.
2640 *
2641 * If we were a target, but our new role
2642 * doesn't indicate a target, leave the
2643 * timers running expecting the role to
2644 * change as the target fully logs in. If
2645 * it doesn't, the target will be torn down.
2646 *
2647 * If we were a target, and our role shows
2648 * we're still a target, cancel the timers
2649 * and kick off a scan.
2650 */
2651
2652 /* was a target, not in roles */
2653 if ((rport->scsi_target_id != -1) &&
2654 (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2655 return rport;
2656
2657 /*
2658 * Stop the fail io and dev_loss timers.
2659 * If they flush, the port_state will
2660 * be checked and will NOOP the function.
2661 */
2662 if (!cancel_delayed_work(&rport->fail_io_work))
2663 fc_flush_devloss(shost);
2664 if (!cancel_delayed_work(&rport->dev_loss_work))
2665 fc_flush_devloss(shost);
2666
2667 spin_lock_irqsave(shost->host_lock, flags);
2668
2669 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2670 FC_RPORT_DEVLOSS_PENDING |
2671 FC_RPORT_DEVLOSS_CALLBK_DONE);
2672
2673 /* if target, initiate a scan */
2674 if (rport->scsi_target_id != -1) {
2675 rport->flags |= FC_RPORT_SCAN_PENDING;
2676 scsi_queue_work(shost,
2677 &rport->scan_work);
2678 spin_unlock_irqrestore(shost->host_lock,
2679 flags);
2680 scsi_target_unblock(&rport->dev);
2681 } else
2682 spin_unlock_irqrestore(shost->host_lock,
2683 flags);
2684
2685 fc_bsg_goose_queue(rport);
2686
2687 return rport;
2688 }
2689 }
2690 }
2691
2692 /*
2693 * Search the bindings array
2694 * Note: if never a FCP target, you won't be on this list
2695 */
2696 if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2697
2698 /* search for a matching consistent binding */
2699
2700 list_for_each_entry(rport, &fc_host->rport_bindings,
2701 peers) {
2702 if (rport->channel != channel)
2703 continue;
2704
2705 switch (fc_host->tgtid_bind_type) {
2706 case FC_TGTID_BIND_BY_WWPN:
2707 if (rport->port_name == ids->port_name)
2708 match = 1;
2709 break;
2710 case FC_TGTID_BIND_BY_WWNN:
2711 if (rport->node_name == ids->node_name)
2712 match = 1;
2713 break;
2714 case FC_TGTID_BIND_BY_ID:
2715 if (rport->port_id == ids->port_id)
2716 match = 1;
2717 break;
2718 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2719 break;
2720 }
2721
2722 if (match) {
2723 list_move_tail(&rport->peers, &fc_host->rports);
2724 break;
2725 }
2726 }
2727
2728 if (match) {
2729 memcpy(&rport->node_name, &ids->node_name,
2730 sizeof(rport->node_name));
2731 memcpy(&rport->port_name, &ids->port_name,
2732 sizeof(rport->port_name));
2733 rport->port_id = ids->port_id;
2734 rport->roles = ids->roles;
2735 rport->port_state = FC_PORTSTATE_ONLINE;
2736 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2737
2738 if (fci->f->dd_fcrport_size)
2739 memset(rport->dd_data, 0,
2740 fci->f->dd_fcrport_size);
2741
2742 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2743 /* initiate a scan of the target */
2744 rport->flags |= FC_RPORT_SCAN_PENDING;
2745 scsi_queue_work(shost, &rport->scan_work);
2746 spin_unlock_irqrestore(shost->host_lock, flags);
2747 scsi_target_unblock(&rport->dev);
2748 } else
2749 spin_unlock_irqrestore(shost->host_lock, flags);
2750
2751 return rport;
2752 }
2753 }
2754
2755 spin_unlock_irqrestore(shost->host_lock, flags);
2756
2757 /* No consistent binding found - create new remote port entry */
2758 rport = fc_rport_create(shost, channel, ids);
2759
2760 return rport;
2761 }
2762 EXPORT_SYMBOL(fc_remote_port_add);
2763
2764
2765 /**
2766 * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2767 * @rport: The remote port that no longer exists
2768 *
2769 * The LLDD calls this routine to notify the transport that a remote
2770 * port is no longer part of the topology. Note: Although a port
2771 * may no longer be part of the topology, it may persist in the remote
2772 * ports displayed by the fc_host. We do this under 2 conditions:
2773 * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2774 * This allows the port to temporarily disappear, then reappear without
2775 * disrupting the SCSI device tree attached to it. During the "blocked"
2776 * period the port will still exist.
2777 * 2) If the port was a scsi target and disappears for longer than we
2778 * expect, we'll delete the port and the tear down the SCSI device tree
2779 * attached to it. However, we want to semi-persist the target id assigned
2780 * to that port if it eventually does exist. The port structure will
2781 * remain (although with minimal information) so that the target id
2782 * bindings remails.
2783 *
2784 * If the remote port is not an FCP Target, it will be fully torn down
2785 * and deallocated, including the fc_remote_port class device.
2786 *
2787 * If the remote port is an FCP Target, the port will be placed in a
2788 * temporary blocked state. From the LLDD's perspective, the rport no
2789 * longer exists. From the SCSI midlayer's perspective, the SCSI target
2790 * exists, but all sdevs on it are blocked from further I/O. The following
2791 * is then expected.
2792 *
2793 * If the remote port does not return (signaled by a LLDD call to
2794 * fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2795 * scsi target is removed - killing all outstanding i/o and removing the
2796 * scsi devices attached ot it. The port structure will be marked Not
2797 * Present and be partially cleared, leaving only enough information to
2798 * recognize the remote port relative to the scsi target id binding if
2799 * it later appears. The port will remain as long as there is a valid
2800 * binding (e.g. until the user changes the binding type or unloads the
2801 * scsi host with the binding).
2802 *
2803 * If the remote port returns within the dev_loss_tmo value (and matches
2804 * according to the target id binding type), the port structure will be
2805 * reused. If it is no longer a SCSI target, the target will be torn
2806 * down. If it continues to be a SCSI target, then the target will be
2807 * unblocked (allowing i/o to be resumed), and a scan will be activated
2808 * to ensure that all luns are detected.
2809 *
2810 * Called from normal process context only - cannot be called from interrupt.
2811 *
2812 * Notes:
2813 * This routine assumes no locks are held on entry.
2814 */
2815 void
2816 fc_remote_port_delete(struct fc_rport *rport)
2817 {
2818 struct Scsi_Host *shost = rport_to_shost(rport);
2819 int timeout = rport->dev_loss_tmo;
2820 unsigned long flags;
2821
2822 /*
2823 * No need to flush the fc_host work_q's, as all adds are synchronous.
2824 *
2825 * We do need to reclaim the rport scan work element, so eventually
2826 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2827 * there's still a scan pending.
2828 */
2829
2830 spin_lock_irqsave(shost->host_lock, flags);
2831
2832 if (rport->port_state != FC_PORTSTATE_ONLINE) {
2833 spin_unlock_irqrestore(shost->host_lock, flags);
2834 return;
2835 }
2836
2837 /*
2838 * In the past, we if this was not an FCP-Target, we would
2839 * unconditionally just jump to deleting the rport.
2840 * However, rports can be used as node containers by the LLDD,
2841 * and its not appropriate to just terminate the rport at the
2842 * first sign of a loss in connectivity. The LLDD may want to
2843 * send ELS traffic to re-validate the login. If the rport is
2844 * immediately deleted, it makes it inappropriate for a node
2845 * container.
2846 * So... we now unconditionally wait dev_loss_tmo before
2847 * destroying an rport.
2848 */
2849
2850 rport->port_state = FC_PORTSTATE_BLOCKED;
2851
2852 rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2853
2854 spin_unlock_irqrestore(shost->host_lock, flags);
2855
2856 if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2857 shost->active_mode & MODE_TARGET)
2858 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2859
2860 scsi_target_block(&rport->dev);
2861
2862 /* see if we need to kill io faster than waiting for device loss */
2863 if ((rport->fast_io_fail_tmo != -1) &&
2864 (rport->fast_io_fail_tmo < timeout))
2865 fc_queue_devloss_work(shost, &rport->fail_io_work,
2866 rport->fast_io_fail_tmo * HZ);
2867
2868 /* cap the length the devices can be blocked until they are deleted */
2869 fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2870 }
2871 EXPORT_SYMBOL(fc_remote_port_delete);
2872
2873 /**
2874 * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
2875 * @rport: The remote port that changed.
2876 * @roles: New roles for this port.
2877 *
2878 * Description: The LLDD calls this routine to notify the transport that the
2879 * roles on a remote port may have changed. The largest effect of this is
2880 * if a port now becomes a FCP Target, it must be allocated a
2881 * scsi target id. If the port is no longer a FCP target, any
2882 * scsi target id value assigned to it will persist in case the
2883 * role changes back to include FCP Target. No changes in the scsi
2884 * midlayer will be invoked if the role changes (in the expectation
2885 * that the role will be resumed. If it doesn't normal error processing
2886 * will take place).
2887 *
2888 * Should not be called from interrupt context.
2889 *
2890 * Notes:
2891 * This routine assumes no locks are held on entry.
2892 */
2893 void
2894 fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
2895 {
2896 struct Scsi_Host *shost = rport_to_shost(rport);
2897 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2898 unsigned long flags;
2899 int create = 0;
2900 int ret;
2901
2902 spin_lock_irqsave(shost->host_lock, flags);
2903 if (roles & FC_PORT_ROLE_FCP_TARGET) {
2904 if (rport->scsi_target_id == -1) {
2905 rport->scsi_target_id = fc_host->next_target_id++;
2906 create = 1;
2907 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
2908 create = 1;
2909 } else if (shost->active_mode & MODE_TARGET) {
2910 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
2911 (char *)&rport->node_name);
2912 if (ret)
2913 printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
2914 ret);
2915 }
2916
2917 rport->roles = roles;
2918
2919 spin_unlock_irqrestore(shost->host_lock, flags);
2920
2921 if (create) {
2922 /*
2923 * There may have been a delete timer running on the
2924 * port. Ensure that it is cancelled as we now know
2925 * the port is an FCP Target.
2926 * Note: we know the rport is exists and in an online
2927 * state as the LLDD would not have had an rport
2928 * reference to pass us.
2929 *
2930 * Take no action on the del_timer failure as the state
2931 * machine state change will validate the
2932 * transaction.
2933 */
2934 if (!cancel_delayed_work(&rport->fail_io_work))
2935 fc_flush_devloss(shost);
2936 if (!cancel_delayed_work(&rport->dev_loss_work))
2937 fc_flush_devloss(shost);
2938
2939 spin_lock_irqsave(shost->host_lock, flags);
2940 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2941 FC_RPORT_DEVLOSS_PENDING);
2942 spin_unlock_irqrestore(shost->host_lock, flags);
2943
2944 /* ensure any stgt delete functions are done */
2945 fc_flush_work(shost);
2946
2947 /* initiate a scan of the target */
2948 spin_lock_irqsave(shost->host_lock, flags);
2949 rport->flags |= FC_RPORT_SCAN_PENDING;
2950 scsi_queue_work(shost, &rport->scan_work);
2951 spin_unlock_irqrestore(shost->host_lock, flags);
2952 scsi_target_unblock(&rport->dev);
2953 }
2954 }
2955 EXPORT_SYMBOL(fc_remote_port_rolechg);
2956
2957 /**
2958 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
2959 * @work: rport target that failed to reappear in the allotted time.
2960 *
2961 * Description: An attempt to delete a remote port blocks, and if it fails
2962 * to return in the allotted time this gets called.
2963 */
2964 static void
2965 fc_timeout_deleted_rport(struct work_struct *work)
2966 {
2967 struct fc_rport *rport =
2968 container_of(work, struct fc_rport, dev_loss_work.work);
2969 struct Scsi_Host *shost = rport_to_shost(rport);
2970 struct fc_internal *i = to_fc_internal(shost->transportt);
2971 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2972 unsigned long flags;
2973
2974 spin_lock_irqsave(shost->host_lock, flags);
2975
2976 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2977
2978 /*
2979 * If the port is ONLINE, then it came back. If it was a SCSI
2980 * target, validate it still is. If not, tear down the
2981 * scsi_target on it.
2982 */
2983 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
2984 (rport->scsi_target_id != -1) &&
2985 !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
2986 dev_printk(KERN_ERR, &rport->dev,
2987 "blocked FC remote port time out: no longer"
2988 " a FCP target, removing starget\n");
2989 spin_unlock_irqrestore(shost->host_lock, flags);
2990 scsi_target_unblock(&rport->dev);
2991 fc_queue_work(shost, &rport->stgt_delete_work);
2992 return;
2993 }
2994
2995 /* NOOP state - we're flushing workq's */
2996 if (rport->port_state != FC_PORTSTATE_BLOCKED) {
2997 spin_unlock_irqrestore(shost->host_lock, flags);
2998 dev_printk(KERN_ERR, &rport->dev,
2999 "blocked FC remote port time out: leaving"
3000 " rport%s alone\n",
3001 (rport->scsi_target_id != -1) ? " and starget" : "");
3002 return;
3003 }
3004
3005 if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3006 (rport->scsi_target_id == -1)) {
3007 list_del(&rport->peers);
3008 rport->port_state = FC_PORTSTATE_DELETED;
3009 dev_printk(KERN_ERR, &rport->dev,
3010 "blocked FC remote port time out: removing"
3011 " rport%s\n",
3012 (rport->scsi_target_id != -1) ? " and starget" : "");
3013 fc_queue_work(shost, &rport->rport_delete_work);
3014 spin_unlock_irqrestore(shost->host_lock, flags);
3015 return;
3016 }
3017
3018 dev_printk(KERN_ERR, &rport->dev,
3019 "blocked FC remote port time out: removing target and "
3020 "saving binding\n");
3021
3022 list_move_tail(&rport->peers, &fc_host->rport_bindings);
3023
3024 /*
3025 * Note: We do not remove or clear the hostdata area. This allows
3026 * host-specific target data to persist along with the
3027 * scsi_target_id. It's up to the host to manage it's hostdata area.
3028 */
3029
3030 /*
3031 * Reinitialize port attributes that may change if the port comes back.
3032 */
3033 rport->maxframe_size = -1;
3034 rport->supported_classes = FC_COS_UNSPECIFIED;
3035 rport->roles = FC_PORT_ROLE_UNKNOWN;
3036 rport->port_state = FC_PORTSTATE_NOTPRESENT;
3037 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3038 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3039
3040 /*
3041 * Pre-emptively kill I/O rather than waiting for the work queue
3042 * item to teardown the starget. (FCOE libFC folks prefer this
3043 * and to have the rport_port_id still set when it's done).
3044 */
3045 spin_unlock_irqrestore(shost->host_lock, flags);
3046 fc_terminate_rport_io(rport);
3047
3048 BUG_ON(rport->port_state != FC_PORTSTATE_NOTPRESENT);
3049
3050 /* remove the identifiers that aren't used in the consisting binding */
3051 switch (fc_host->tgtid_bind_type) {
3052 case FC_TGTID_BIND_BY_WWPN:
3053 rport->node_name = -1;
3054 rport->port_id = -1;
3055 break;
3056 case FC_TGTID_BIND_BY_WWNN:
3057 rport->port_name = -1;
3058 rport->port_id = -1;
3059 break;
3060 case FC_TGTID_BIND_BY_ID:
3061 rport->node_name = -1;
3062 rport->port_name = -1;
3063 break;
3064 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3065 break;
3066 }
3067
3068 /*
3069 * As this only occurs if the remote port (scsi target)
3070 * went away and didn't come back - we'll remove
3071 * all attached scsi devices.
3072 */
3073 fc_queue_work(shost, &rport->stgt_delete_work);
3074
3075 /*
3076 * Notify the driver that the rport is now dead. The LLDD will
3077 * also guarantee that any communication to the rport is terminated
3078 *
3079 * Note: we set the CALLBK_DONE flag above to correspond
3080 */
3081 if (i->f->dev_loss_tmo_callbk)
3082 i->f->dev_loss_tmo_callbk(rport);
3083 }
3084
3085
3086 /**
3087 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3088 * @work: rport to terminate io on.
3089 *
3090 * Notes: Only requests the failure of the io, not that all are flushed
3091 * prior to returning.
3092 */
3093 static void
3094 fc_timeout_fail_rport_io(struct work_struct *work)
3095 {
3096 struct fc_rport *rport =
3097 container_of(work, struct fc_rport, fail_io_work.work);
3098
3099 if (rport->port_state != FC_PORTSTATE_BLOCKED)
3100 return;
3101
3102 rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3103 fc_terminate_rport_io(rport);
3104 }
3105
3106 /**
3107 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3108 * @work: remote port to be scanned.
3109 */
3110 static void
3111 fc_scsi_scan_rport(struct work_struct *work)
3112 {
3113 struct fc_rport *rport =
3114 container_of(work, struct fc_rport, scan_work);
3115 struct Scsi_Host *shost = rport_to_shost(rport);
3116 struct fc_internal *i = to_fc_internal(shost->transportt);
3117 unsigned long flags;
3118
3119 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3120 (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3121 !(i->f->disable_target_scan)) {
3122 scsi_scan_target(&rport->dev, rport->channel,
3123 rport->scsi_target_id, SCAN_WILD_CARD, 1);
3124 }
3125
3126 spin_lock_irqsave(shost->host_lock, flags);
3127 rport->flags &= ~FC_RPORT_SCAN_PENDING;
3128 spin_unlock_irqrestore(shost->host_lock, flags);
3129 }
3130
3131
3132 /**
3133 * fc_vport_setup - allocates and creates a FC virtual port.
3134 * @shost: scsi host the virtual port is connected to.
3135 * @channel: Channel on shost port connected to.
3136 * @pdev: parent device for vport
3137 * @ids: The world wide names, FC4 port roles, etc for
3138 * the virtual port.
3139 * @ret_vport: The pointer to the created vport.
3140 *
3141 * Allocates and creates the vport structure, calls the parent host
3142 * to instantiate the vport, the completes w/ class and sysfs creation.
3143 *
3144 * Notes:
3145 * This routine assumes no locks are held on entry.
3146 */
3147 static int
3148 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3149 struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
3150 {
3151 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3152 struct fc_internal *fci = to_fc_internal(shost->transportt);
3153 struct fc_vport *vport;
3154 struct device *dev;
3155 unsigned long flags;
3156 size_t size;
3157 int error;
3158
3159 *ret_vport = NULL;
3160
3161 if ( ! fci->f->vport_create)
3162 return -ENOENT;
3163
3164 size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3165 vport = kzalloc(size, GFP_KERNEL);
3166 if (unlikely(!vport)) {
3167 printk(KERN_ERR "%s: allocation failure\n", __func__);
3168 return -ENOMEM;
3169 }
3170
3171 vport->vport_state = FC_VPORT_UNKNOWN;
3172 vport->vport_last_state = FC_VPORT_UNKNOWN;
3173 vport->node_name = ids->node_name;
3174 vport->port_name = ids->port_name;
3175 vport->roles = ids->roles;
3176 vport->vport_type = ids->vport_type;
3177 if (fci->f->dd_fcvport_size)
3178 vport->dd_data = &vport[1];
3179 vport->shost = shost;
3180 vport->channel = channel;
3181 vport->flags = FC_VPORT_CREATING;
3182 INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3183
3184 spin_lock_irqsave(shost->host_lock, flags);
3185
3186 if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3187 spin_unlock_irqrestore(shost->host_lock, flags);
3188 kfree(vport);
3189 return -ENOSPC;
3190 }
3191 fc_host->npiv_vports_inuse++;
3192 vport->number = fc_host->next_vport_number++;
3193 list_add_tail(&vport->peers, &fc_host->vports);
3194 get_device(&shost->shost_gendev); /* for fc_host->vport list */
3195
3196 spin_unlock_irqrestore(shost->host_lock, flags);
3197
3198 dev = &vport->dev;
3199 device_initialize(dev); /* takes self reference */
3200 dev->parent = get_device(pdev); /* takes parent reference */
3201 dev->release = fc_vport_dev_release;
3202 dev_set_name(dev, "vport-%d:%d-%d",
3203 shost->host_no, channel, vport->number);
3204 transport_setup_device(dev);
3205
3206 error = device_add(dev);
3207 if (error) {
3208 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3209 goto delete_vport;
3210 }
3211 transport_add_device(dev);
3212 transport_configure_device(dev);
3213
3214 error = fci->f->vport_create(vport, ids->disable);
3215 if (error) {
3216 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3217 goto delete_vport_all;
3218 }
3219
3220 /*
3221 * if the parent isn't the physical adapter's Scsi_Host, ensure
3222 * the Scsi_Host at least contains ia symlink to the vport.
3223 */
3224 if (pdev != &shost->shost_gendev) {
3225 error = sysfs_create_link(&shost->shost_gendev.kobj,
3226 &dev->kobj, dev_name(dev));
3227 if (error)
3228 printk(KERN_ERR
3229 "%s: Cannot create vport symlinks for "
3230 "%s, err=%d\n",
3231 __func__, dev_name(dev), error);
3232 }
3233 spin_lock_irqsave(shost->host_lock, flags);
3234 vport->flags &= ~FC_VPORT_CREATING;
3235 spin_unlock_irqrestore(shost->host_lock, flags);
3236
3237 dev_printk(KERN_NOTICE, pdev,
3238 "%s created via shost%d channel %d\n", dev_name(dev),
3239 shost->host_no, channel);
3240
3241 *ret_vport = vport;
3242
3243 return 0;
3244
3245 delete_vport_all:
3246 transport_remove_device(dev);
3247 device_del(dev);
3248 delete_vport:
3249 transport_destroy_device(dev);
3250 spin_lock_irqsave(shost->host_lock, flags);
3251 list_del(&vport->peers);
3252 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3253 fc_host->npiv_vports_inuse--;
3254 spin_unlock_irqrestore(shost->host_lock, flags);
3255 put_device(dev->parent);
3256 kfree(vport);
3257
3258 return error;
3259 }
3260
3261 /**
3262 * fc_vport_create - Admin App or LLDD requests creation of a vport
3263 * @shost: scsi host the virtual port is connected to.
3264 * @channel: channel on shost port connected to.
3265 * @ids: The world wide names, FC4 port roles, etc for
3266 * the virtual port.
3267 *
3268 * Notes:
3269 * This routine assumes no locks are held on entry.
3270 */
3271 struct fc_vport *
3272 fc_vport_create(struct Scsi_Host *shost, int channel,
3273 struct fc_vport_identifiers *ids)
3274 {
3275 int stat;
3276 struct fc_vport *vport;
3277
3278 stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3279 ids, &vport);
3280 return stat ? NULL : vport;
3281 }
3282 EXPORT_SYMBOL(fc_vport_create);
3283
3284 /**
3285 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3286 * @vport: fc_vport to be terminated
3287 *
3288 * Calls the LLDD vport_delete() function, then deallocates and removes
3289 * the vport from the shost and object tree.
3290 *
3291 * Notes:
3292 * This routine assumes no locks are held on entry.
3293 */
3294 int
3295 fc_vport_terminate(struct fc_vport *vport)
3296 {
3297 struct Scsi_Host *shost = vport_to_shost(vport);
3298 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3299 struct fc_internal *i = to_fc_internal(shost->transportt);
3300 struct device *dev = &vport->dev;
3301 unsigned long flags;
3302 int stat;
3303
3304 spin_lock_irqsave(shost->host_lock, flags);
3305 if (vport->flags & FC_VPORT_CREATING) {
3306 spin_unlock_irqrestore(shost->host_lock, flags);
3307 return -EBUSY;
3308 }
3309 if (vport->flags & (FC_VPORT_DEL)) {
3310 spin_unlock_irqrestore(shost->host_lock, flags);
3311 return -EALREADY;
3312 }
3313 vport->flags |= FC_VPORT_DELETING;
3314 spin_unlock_irqrestore(shost->host_lock, flags);
3315
3316 if (i->f->vport_delete)
3317 stat = i->f->vport_delete(vport);
3318 else
3319 stat = -ENOENT;
3320
3321 spin_lock_irqsave(shost->host_lock, flags);
3322 vport->flags &= ~FC_VPORT_DELETING;
3323 if (!stat) {
3324 vport->flags |= FC_VPORT_DELETED;
3325 list_del(&vport->peers);
3326 fc_host->npiv_vports_inuse--;
3327 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3328 }
3329 spin_unlock_irqrestore(shost->host_lock, flags);
3330
3331 if (stat)
3332 return stat;
3333
3334 if (dev->parent != &shost->shost_gendev)
3335 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3336 transport_remove_device(dev);
3337 device_del(dev);
3338 transport_destroy_device(dev);
3339
3340 /*
3341 * Removing our self-reference should mean our
3342 * release function gets called, which will drop the remaining
3343 * parent reference and free the data structure.
3344 */
3345 put_device(dev); /* for self-reference */
3346
3347 return 0; /* SUCCESS */
3348 }
3349 EXPORT_SYMBOL(fc_vport_terminate);
3350
3351 /**
3352 * fc_vport_sched_delete - workq-based delete request for a vport
3353 * @work: vport to be deleted.
3354 */
3355 static void
3356 fc_vport_sched_delete(struct work_struct *work)
3357 {
3358 struct fc_vport *vport =
3359 container_of(work, struct fc_vport, vport_delete_work);
3360 int stat;
3361
3362 stat = fc_vport_terminate(vport);
3363 if (stat)
3364 dev_printk(KERN_ERR, vport->dev.parent,
3365 "%s: %s could not be deleted created via "
3366 "shost%d channel %d - error %d\n", __func__,
3367 dev_name(&vport->dev), vport->shost->host_no,
3368 vport->channel, stat);
3369 }
3370
3371
3372 /*
3373 * BSG support
3374 */
3375
3376
3377 /**
3378 * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3379 * @job: fc_bsg_job that is to be torn down
3380 */
3381 static void
3382 fc_destroy_bsgjob(struct fc_bsg_job *job)
3383 {
3384 unsigned long flags;
3385
3386 spin_lock_irqsave(&job->job_lock, flags);
3387 if (job->ref_cnt) {
3388 spin_unlock_irqrestore(&job->job_lock, flags);
3389 return;
3390 }
3391 spin_unlock_irqrestore(&job->job_lock, flags);
3392
3393 put_device(job->dev); /* release reference for the request */
3394
3395 kfree(job->request_payload.sg_list);
3396 kfree(job->reply_payload.sg_list);
3397 kfree(job);
3398 }
3399
3400 /**
3401 * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3402 * completed
3403 * @job: fc_bsg_job that is complete
3404 */
3405 static void
3406 fc_bsg_jobdone(struct fc_bsg_job *job)
3407 {
3408 struct request *req = job->req;
3409 struct request *rsp = req->next_rq;
3410 int err;
3411
3412 err = job->req->errors = job->reply->result;
3413
3414 if (err < 0)
3415 /* we're only returning the result field in the reply */
3416 job->req->sense_len = sizeof(uint32_t);
3417 else
3418 job->req->sense_len = job->reply_len;
3419
3420 /* we assume all request payload was transferred, residual == 0 */
3421 req->resid_len = 0;
3422
3423 if (rsp) {
3424 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3425
3426 /* set reply (bidi) residual */
3427 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3428 rsp->resid_len);
3429 }
3430 blk_complete_request(req);
3431 }
3432
3433 /**
3434 * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3435 * @rq: BSG request that holds the job to be destroyed
3436 */
3437 static void fc_bsg_softirq_done(struct request *rq)
3438 {
3439 struct fc_bsg_job *job = rq->special;
3440 unsigned long flags;
3441
3442 spin_lock_irqsave(&job->job_lock, flags);
3443 job->state_flags |= FC_RQST_STATE_DONE;
3444 job->ref_cnt--;
3445 spin_unlock_irqrestore(&job->job_lock, flags);
3446
3447 blk_end_request_all(rq, rq->errors);
3448 fc_destroy_bsgjob(job);
3449 }
3450
3451 /**
3452 * fc_bsg_job_timeout - handler for when a bsg request timesout
3453 * @req: request that timed out
3454 */
3455 static enum blk_eh_timer_return
3456 fc_bsg_job_timeout(struct request *req)
3457 {
3458 struct fc_bsg_job *job = (void *) req->special;
3459 struct Scsi_Host *shost = job->shost;
3460 struct fc_internal *i = to_fc_internal(shost->transportt);
3461 unsigned long flags;
3462 int err = 0, done = 0;
3463
3464 if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3465 return BLK_EH_RESET_TIMER;
3466
3467 spin_lock_irqsave(&job->job_lock, flags);
3468 if (job->state_flags & FC_RQST_STATE_DONE)
3469 done = 1;
3470 else
3471 job->ref_cnt++;
3472 spin_unlock_irqrestore(&job->job_lock, flags);
3473
3474 if (!done && i->f->bsg_timeout) {
3475 /* call LLDD to abort the i/o as it has timed out */
3476 err = i->f->bsg_timeout(job);
3477 if (err)
3478 printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3479 "abort failed with status %d\n", err);
3480 }
3481
3482 /* the blk_end_sync_io() doesn't check the error */
3483 if (done)
3484 return BLK_EH_NOT_HANDLED;
3485 else
3486 return BLK_EH_HANDLED;
3487 }
3488
3489 static int
3490 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3491 {
3492 size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3493
3494 BUG_ON(!req->nr_phys_segments);
3495
3496 buf->sg_list = kzalloc(sz, GFP_KERNEL);
3497 if (!buf->sg_list)
3498 return -ENOMEM;
3499 sg_init_table(buf->sg_list, req->nr_phys_segments);
3500 buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3501 buf->payload_len = blk_rq_bytes(req);
3502 return 0;
3503 }
3504
3505
3506 /**
3507 * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3508 * bsg request
3509 * @shost: SCSI Host corresponding to the bsg object
3510 * @rport: (optional) FC Remote Port corresponding to the bsg object
3511 * @req: BSG request that needs a job structure
3512 */
3513 static int
3514 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3515 struct request *req)
3516 {
3517 struct fc_internal *i = to_fc_internal(shost->transportt);
3518 struct request *rsp = req->next_rq;
3519 struct fc_bsg_job *job;
3520 int ret;
3521
3522 BUG_ON(req->special);
3523
3524 job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3525 GFP_KERNEL);
3526 if (!job)
3527 return -ENOMEM;
3528
3529 /*
3530 * Note: this is a bit silly.
3531 * The request gets formatted as a SGIO v4 ioctl request, which
3532 * then gets reformatted as a blk request, which then gets
3533 * reformatted as a fc bsg request. And on completion, we have
3534 * to wrap return results such that SGIO v4 thinks it was a scsi
3535 * status. I hope this was all worth it.
3536 */
3537
3538 req->special = job;
3539 job->shost = shost;
3540 job->rport = rport;
3541 job->req = req;
3542 if (i->f->dd_bsg_size)
3543 job->dd_data = (void *)&job[1];
3544 spin_lock_init(&job->job_lock);
3545 job->request = (struct fc_bsg_request *)req->cmd;
3546 job->request_len = req->cmd_len;
3547 job->reply = req->sense;
3548 job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3549 * allocated */
3550 if (req->bio) {
3551 ret = fc_bsg_map_buffer(&job->request_payload, req);
3552 if (ret)
3553 goto failjob_rls_job;
3554 }
3555 if (rsp && rsp->bio) {
3556 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3557 if (ret)
3558 goto failjob_rls_rqst_payload;
3559 }
3560 job->job_done = fc_bsg_jobdone;
3561 if (rport)
3562 job->dev = &rport->dev;
3563 else
3564 job->dev = &shost->shost_gendev;
3565 get_device(job->dev); /* take a reference for the request */
3566
3567 job->ref_cnt = 1;
3568
3569 return 0;
3570
3571
3572 failjob_rls_rqst_payload:
3573 kfree(job->request_payload.sg_list);
3574 failjob_rls_job:
3575 kfree(job);
3576 return -ENOMEM;
3577 }
3578
3579
3580 enum fc_dispatch_result {
3581 FC_DISPATCH_BREAK, /* on return, q is locked, break from q loop */
3582 FC_DISPATCH_LOCKED, /* on return, q is locked, continue on */
3583 FC_DISPATCH_UNLOCKED, /* on return, q is unlocked, continue on */
3584 };
3585
3586
3587 /**
3588 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3589 * @q: fc host request queue
3590 * @shost: scsi host rport attached to
3591 * @job: bsg job to be processed
3592 */
3593 static enum fc_dispatch_result
3594 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3595 struct fc_bsg_job *job)
3596 {
3597 struct fc_internal *i = to_fc_internal(shost->transportt);
3598 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3599 int ret;
3600
3601 /* Validate the host command */
3602 switch (job->request->msgcode) {
3603 case FC_BSG_HST_ADD_RPORT:
3604 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3605 break;
3606
3607 case FC_BSG_HST_DEL_RPORT:
3608 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3609 break;
3610
3611 case FC_BSG_HST_ELS_NOLOGIN:
3612 cmdlen += sizeof(struct fc_bsg_host_els);
3613 /* there better be a xmt and rcv payloads */
3614 if ((!job->request_payload.payload_len) ||
3615 (!job->reply_payload.payload_len)) {
3616 ret = -EINVAL;
3617 goto fail_host_msg;
3618 }
3619 break;
3620
3621 case FC_BSG_HST_CT:
3622 cmdlen += sizeof(struct fc_bsg_host_ct);
3623 /* there better be xmt and rcv payloads */
3624 if ((!job->request_payload.payload_len) ||
3625 (!job->reply_payload.payload_len)) {
3626 ret = -EINVAL;
3627 goto fail_host_msg;
3628 }
3629 break;
3630
3631 case FC_BSG_HST_VENDOR:
3632 cmdlen += sizeof(struct fc_bsg_host_vendor);
3633 if ((shost->hostt->vendor_id == 0L) ||
3634 (job->request->rqst_data.h_vendor.vendor_id !=
3635 shost->hostt->vendor_id)) {
3636 ret = -ESRCH;
3637 goto fail_host_msg;
3638 }
3639 break;
3640
3641 default:
3642 ret = -EBADR;
3643 goto fail_host_msg;
3644 }
3645
3646 /* check if we really have all the request data needed */
3647 if (job->request_len < cmdlen) {
3648 ret = -ENOMSG;
3649 goto fail_host_msg;
3650 }
3651
3652 ret = i->f->bsg_request(job);
3653 if (!ret)
3654 return FC_DISPATCH_UNLOCKED;
3655
3656 fail_host_msg:
3657 /* return the errno failure code as the only status */
3658 BUG_ON(job->reply_len < sizeof(uint32_t));
3659 job->reply->result = ret;
3660 job->reply_len = sizeof(uint32_t);
3661 fc_bsg_jobdone(job);
3662 return FC_DISPATCH_UNLOCKED;
3663 }
3664
3665
3666 /*
3667 * fc_bsg_goose_queue - restart rport queue in case it was stopped
3668 * @rport: rport to be restarted
3669 */
3670 static void
3671 fc_bsg_goose_queue(struct fc_rport *rport)
3672 {
3673 int flagset;
3674 unsigned long flags;
3675
3676 if (!rport->rqst_q)
3677 return;
3678
3679 get_device(&rport->dev);
3680
3681 spin_lock_irqsave(rport->rqst_q->queue_lock, flags);
3682 flagset = test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags) &&
3683 !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags);
3684 if (flagset)
3685 queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q);
3686 __blk_run_queue(rport->rqst_q);
3687 if (flagset)
3688 queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q);
3689 spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags);
3690
3691 put_device(&rport->dev);
3692 }
3693
3694
3695 /**
3696 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3697 * @q: rport request queue
3698 * @shost: scsi host rport attached to
3699 * @rport: rport request destined to
3700 * @job: bsg job to be processed
3701 */
3702 static enum fc_dispatch_result
3703 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3704 struct fc_rport *rport, struct fc_bsg_job *job)
3705 {
3706 struct fc_internal *i = to_fc_internal(shost->transportt);
3707 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3708 int ret;
3709
3710 /* Validate the rport command */
3711 switch (job->request->msgcode) {
3712 case FC_BSG_RPT_ELS:
3713 cmdlen += sizeof(struct fc_bsg_rport_els);
3714 goto check_bidi;
3715
3716 case FC_BSG_RPT_CT:
3717 cmdlen += sizeof(struct fc_bsg_rport_ct);
3718 check_bidi:
3719 /* there better be xmt and rcv payloads */
3720 if ((!job->request_payload.payload_len) ||
3721 (!job->reply_payload.payload_len)) {
3722 ret = -EINVAL;
3723 goto fail_rport_msg;
3724 }
3725 break;
3726 default:
3727 ret = -EBADR;
3728 goto fail_rport_msg;
3729 }
3730
3731 /* check if we really have all the request data needed */
3732 if (job->request_len < cmdlen) {
3733 ret = -ENOMSG;
3734 goto fail_rport_msg;
3735 }
3736
3737 ret = i->f->bsg_request(job);
3738 if (!ret)
3739 return FC_DISPATCH_UNLOCKED;
3740
3741 fail_rport_msg:
3742 /* return the errno failure code as the only status */
3743 BUG_ON(job->reply_len < sizeof(uint32_t));
3744 job->reply->result = ret;
3745 job->reply_len = sizeof(uint32_t);
3746 fc_bsg_jobdone(job);
3747 return FC_DISPATCH_UNLOCKED;
3748 }
3749
3750
3751 /**
3752 * fc_bsg_request_handler - generic handler for bsg requests
3753 * @q: request queue to manage
3754 * @shost: Scsi_Host related to the bsg object
3755 * @rport: FC remote port related to the bsg object (optional)
3756 * @dev: device structure for bsg object
3757 */
3758 static void
3759 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3760 struct fc_rport *rport, struct device *dev)
3761 {
3762 struct request *req;
3763 struct fc_bsg_job *job;
3764 enum fc_dispatch_result ret;
3765
3766 if (!get_device(dev))
3767 return;
3768
3769 while (!blk_queue_plugged(q)) {
3770 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED))
3771 break;
3772
3773 req = blk_fetch_request(q);
3774 if (!req)
3775 break;
3776
3777 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3778 req->errors = -ENXIO;
3779 spin_unlock_irq(q->queue_lock);
3780 blk_end_request(req, -ENXIO, blk_rq_bytes(req));
3781 spin_lock_irq(q->queue_lock);
3782 continue;
3783 }
3784
3785 spin_unlock_irq(q->queue_lock);
3786
3787 ret = fc_req_to_bsgjob(shost, rport, req);
3788 if (ret) {
3789 req->errors = ret;
3790 blk_end_request(req, ret, blk_rq_bytes(req));
3791 spin_lock_irq(q->queue_lock);
3792 continue;
3793 }
3794
3795 job = req->special;
3796
3797 /* check if we have the msgcode value at least */
3798 if (job->request_len < sizeof(uint32_t)) {
3799 BUG_ON(job->reply_len < sizeof(uint32_t));
3800 job->reply->result = -ENOMSG;
3801 job->reply_len = sizeof(uint32_t);
3802 fc_bsg_jobdone(job);
3803 spin_lock_irq(q->queue_lock);
3804 continue;
3805 }
3806
3807 /* the dispatch routines will unlock the queue_lock */
3808 if (rport)
3809 ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3810 else
3811 ret = fc_bsg_host_dispatch(q, shost, job);
3812
3813 /* did dispatcher hit state that can't process any more */
3814 if (ret == FC_DISPATCH_BREAK)
3815 break;
3816
3817 /* did dispatcher had released the lock */
3818 if (ret == FC_DISPATCH_UNLOCKED)
3819 spin_lock_irq(q->queue_lock);
3820 }
3821
3822 spin_unlock_irq(q->queue_lock);
3823 put_device(dev);
3824 spin_lock_irq(q->queue_lock);
3825 }
3826
3827
3828 /**
3829 * fc_bsg_host_handler - handler for bsg requests for a fc host
3830 * @q: fc host request queue
3831 */
3832 static void
3833 fc_bsg_host_handler(struct request_queue *q)
3834 {
3835 struct Scsi_Host *shost = q->queuedata;
3836
3837 fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
3838 }
3839
3840
3841 /**
3842 * fc_bsg_rport_handler - handler for bsg requests for a fc rport
3843 * @q: rport request queue
3844 */
3845 static void
3846 fc_bsg_rport_handler(struct request_queue *q)
3847 {
3848 struct fc_rport *rport = q->queuedata;
3849 struct Scsi_Host *shost = rport_to_shost(rport);
3850
3851 fc_bsg_request_handler(q, shost, rport, &rport->dev);
3852 }
3853
3854
3855 /**
3856 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
3857 * @shost: shost for fc_host
3858 * @fc_host: fc_host adding the structures to
3859 */
3860 static int
3861 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
3862 {
3863 struct device *dev = &shost->shost_gendev;
3864 struct fc_internal *i = to_fc_internal(shost->transportt);
3865 struct request_queue *q;
3866 int err;
3867 char bsg_name[20];
3868
3869 fc_host->rqst_q = NULL;
3870
3871 if (!i->f->bsg_request)
3872 return -ENOTSUPP;
3873
3874 snprintf(bsg_name, sizeof(bsg_name),
3875 "fc_host%d", shost->host_no);
3876
3877 q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
3878 if (!q) {
3879 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3880 "initialize - no request queue\n",
3881 shost->host_no);
3882 return -ENOMEM;
3883 }
3884
3885 q->queuedata = shost;
3886 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3887 blk_queue_softirq_done(q, fc_bsg_softirq_done);
3888 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3889 blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
3890
3891 err = bsg_register_queue(q, dev, bsg_name, NULL);
3892 if (err) {
3893 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3894 "initialize - register queue\n",
3895 shost->host_no);
3896 blk_cleanup_queue(q);
3897 return err;
3898 }
3899
3900 fc_host->rqst_q = q;
3901 return 0;
3902 }
3903
3904
3905 /**
3906 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
3907 * @shost: shost that rport is attached to
3908 * @rport: rport that the bsg hooks are being attached to
3909 */
3910 static int
3911 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
3912 {
3913 struct device *dev = &rport->dev;
3914 struct fc_internal *i = to_fc_internal(shost->transportt);
3915 struct request_queue *q;
3916 int err;
3917
3918 rport->rqst_q = NULL;
3919
3920 if (!i->f->bsg_request)
3921 return -ENOTSUPP;
3922
3923 q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
3924 if (!q) {
3925 printk(KERN_ERR "%s: bsg interface failed to "
3926 "initialize - no request queue\n",
3927 dev->kobj.name);
3928 return -ENOMEM;
3929 }
3930
3931 q->queuedata = rport;
3932 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3933 blk_queue_softirq_done(q, fc_bsg_softirq_done);
3934 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3935 blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
3936
3937 err = bsg_register_queue(q, dev, NULL, NULL);
3938 if (err) {
3939 printk(KERN_ERR "%s: bsg interface failed to "
3940 "initialize - register queue\n",
3941 dev->kobj.name);
3942 blk_cleanup_queue(q);
3943 return err;
3944 }
3945
3946 rport->rqst_q = q;
3947 return 0;
3948 }
3949
3950
3951 /**
3952 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
3953 * @q: the request_queue that is to be torn down.
3954 */
3955 static void
3956 fc_bsg_remove(struct request_queue *q)
3957 {
3958 if (q) {
3959 bsg_unregister_queue(q);
3960 blk_cleanup_queue(q);
3961 }
3962 }
3963
3964
3965 /* Original Author: Martin Hicks */
3966 MODULE_AUTHOR("James Smart");
3967 MODULE_DESCRIPTION("FC Transport Attributes");
3968 MODULE_LICENSE("GPL");
3969
3970 module_init(fc_transport_init);
3971 module_exit(fc_transport_exit);
Linux for Ginger Game Console