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drm/i915: Fix crash while aborting hibernation
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / scsi_transport_fc.c
blob653f22a8deb9f7ee829667e72e45352f22ea00ea
1 /*
2 * FiberChannel transport specific attributes exported to sysfs.
3 *
4 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 * ========
21 *
22 * Copyright (C) 2004-2007 James Smart, Emulex Corporation
23 * Rewrite for host, target, device, and remote port attributes,
24 * statistics, and service functions...
25 * Add vports, etc
26 *
27 */
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/delay.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_host.h>
33 #include <scsi/scsi_transport.h>
34 #include <scsi/scsi_transport_fc.h>
35 #include <scsi/scsi_cmnd.h>
36 #include <linux/netlink.h>
37 #include <net/netlink.h>
38 #include <scsi/scsi_netlink_fc.h>
39 #include <scsi/scsi_bsg_fc.h>
40 #include "scsi_priv.h"
41 #include "scsi_transport_fc_internal.h"
42
43 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
44 static void fc_vport_sched_delete(struct work_struct *work);
45 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
46 struct device *pdev, struct fc_vport_identifiers *ids,
47 struct fc_vport **vport);
48 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
49 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
50 static void fc_bsg_remove(struct request_queue *);
51 static void fc_bsg_goose_queue(struct fc_rport *);
52
53 /*
54 * Redefine so that we can have same named attributes in the
55 * sdev/starget/host objects.
56 */
57 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
58 struct device_attribute device_attr_##_prefix##_##_name = \
59 __ATTR(_name,_mode,_show,_store)
60
61 #define fc_enum_name_search(title, table_type, table) \
62 static const char *get_fc_##title##_name(enum table_type table_key) \
63 { \
64 int i; \
65 char *name = NULL; \
66 \
67 for (i = 0; i < ARRAY_SIZE(table); i++) { \
68 if (table[i].value == table_key) { \
69 name = table[i].name; \
70 break; \
71 } \
72 } \
73 return name; \
74 }
75
76 #define fc_enum_name_match(title, table_type, table) \
77 static int get_fc_##title##_match(const char *table_key, \
78 enum table_type *value) \
79 { \
80 int i; \
81 \
82 for (i = 0; i < ARRAY_SIZE(table); i++) { \
83 if (strncmp(table_key, table[i].name, \
84 table[i].matchlen) == 0) { \
85 *value = table[i].value; \
86 return 0; /* success */ \
87 } \
88 } \
89 return 1; /* failure */ \
90 }
91
92
93 /* Convert fc_port_type values to ascii string name */
94 static struct {
95 enum fc_port_type value;
96 char *name;
97 } fc_port_type_names[] = {
98 { FC_PORTTYPE_UNKNOWN, "Unknown" },
99 { FC_PORTTYPE_OTHER, "Other" },
100 { FC_PORTTYPE_NOTPRESENT, "Not Present" },
101 { FC_PORTTYPE_NPORT, "NPort (fabric via point-to-point)" },
102 { FC_PORTTYPE_NLPORT, "NLPort (fabric via loop)" },
103 { FC_PORTTYPE_LPORT, "LPort (private loop)" },
104 { FC_PORTTYPE_PTP, "Point-To-Point (direct nport connection)" },
105 { FC_PORTTYPE_NPIV, "NPIV VPORT" },
106 };
107 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
108 #define FC_PORTTYPE_MAX_NAMELEN 50
109
110 /* Reuse fc_port_type enum function for vport_type */
111 #define get_fc_vport_type_name get_fc_port_type_name
112
113
114 /* Convert fc_host_event_code values to ascii string name */
115 static const struct {
116 enum fc_host_event_code value;
117 char *name;
118 } fc_host_event_code_names[] = {
119 { FCH_EVT_LIP, "lip" },
120 { FCH_EVT_LINKUP, "link_up" },
121 { FCH_EVT_LINKDOWN, "link_down" },
122 { FCH_EVT_LIPRESET, "lip_reset" },
123 { FCH_EVT_RSCN, "rscn" },
124 { FCH_EVT_ADAPTER_CHANGE, "adapter_chg" },
125 { FCH_EVT_PORT_UNKNOWN, "port_unknown" },
126 { FCH_EVT_PORT_ONLINE, "port_online" },
127 { FCH_EVT_PORT_OFFLINE, "port_offline" },
128 { FCH_EVT_PORT_FABRIC, "port_fabric" },
129 { FCH_EVT_LINK_UNKNOWN, "link_unknown" },
130 { FCH_EVT_VENDOR_UNIQUE, "vendor_unique" },
131 };
132 fc_enum_name_search(host_event_code, fc_host_event_code,
133 fc_host_event_code_names)
134 #define FC_HOST_EVENT_CODE_MAX_NAMELEN 30
135
136
137 /* Convert fc_port_state values to ascii string name */
138 static struct {
139 enum fc_port_state value;
140 char *name;
141 } fc_port_state_names[] = {
142 { FC_PORTSTATE_UNKNOWN, "Unknown" },
143 { FC_PORTSTATE_NOTPRESENT, "Not Present" },
144 { FC_PORTSTATE_ONLINE, "Online" },
145 { FC_PORTSTATE_OFFLINE, "Offline" },
146 { FC_PORTSTATE_BLOCKED, "Blocked" },
147 { FC_PORTSTATE_BYPASSED, "Bypassed" },
148 { FC_PORTSTATE_DIAGNOSTICS, "Diagnostics" },
149 { FC_PORTSTATE_LINKDOWN, "Linkdown" },
150 { FC_PORTSTATE_ERROR, "Error" },
151 { FC_PORTSTATE_LOOPBACK, "Loopback" },
152 { FC_PORTSTATE_DELETED, "Deleted" },
153 };
154 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
155 #define FC_PORTSTATE_MAX_NAMELEN 20
156
157
158 /* Convert fc_vport_state values to ascii string name */
159 static struct {
160 enum fc_vport_state value;
161 char *name;
162 } fc_vport_state_names[] = {
163 { FC_VPORT_UNKNOWN, "Unknown" },
164 { FC_VPORT_ACTIVE, "Active" },
165 { FC_VPORT_DISABLED, "Disabled" },
166 { FC_VPORT_LINKDOWN, "Linkdown" },
167 { FC_VPORT_INITIALIZING, "Initializing" },
168 { FC_VPORT_NO_FABRIC_SUPP, "No Fabric Support" },
169 { FC_VPORT_NO_FABRIC_RSCS, "No Fabric Resources" },
170 { FC_VPORT_FABRIC_LOGOUT, "Fabric Logout" },
171 { FC_VPORT_FABRIC_REJ_WWN, "Fabric Rejected WWN" },
172 { FC_VPORT_FAILED, "VPort Failed" },
173 };
174 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
175 #define FC_VPORTSTATE_MAX_NAMELEN 24
176
177 /* Reuse fc_vport_state enum function for vport_last_state */
178 #define get_fc_vport_last_state_name get_fc_vport_state_name
179
180
181 /* Convert fc_tgtid_binding_type values to ascii string name */
182 static const struct {
183 enum fc_tgtid_binding_type value;
184 char *name;
185 int matchlen;
186 } fc_tgtid_binding_type_names[] = {
187 { FC_TGTID_BIND_NONE, "none", 4 },
188 { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
189 { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
190 { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
191 };
192 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
193 fc_tgtid_binding_type_names)
194 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
195 fc_tgtid_binding_type_names)
196 #define FC_BINDTYPE_MAX_NAMELEN 30
197
198
199 #define fc_bitfield_name_search(title, table) \
200 static ssize_t \
201 get_fc_##title##_names(u32 table_key, char *buf) \
202 { \
203 char *prefix = ""; \
204 ssize_t len = 0; \
205 int i; \
206 \
207 for (i = 0; i < ARRAY_SIZE(table); i++) { \
208 if (table[i].value & table_key) { \
209 len += sprintf(buf + len, "%s%s", \
210 prefix, table[i].name); \
211 prefix = ", "; \
212 } \
213 } \
214 len += sprintf(buf + len, "\n"); \
215 return len; \
216 }
217
218
219 /* Convert FC_COS bit values to ascii string name */
220 static const struct {
221 u32 value;
222 char *name;
223 } fc_cos_names[] = {
224 { FC_COS_CLASS1, "Class 1" },
225 { FC_COS_CLASS2, "Class 2" },
226 { FC_COS_CLASS3, "Class 3" },
227 { FC_COS_CLASS4, "Class 4" },
228 { FC_COS_CLASS6, "Class 6" },
229 };
230 fc_bitfield_name_search(cos, fc_cos_names)
231
232
233 /* Convert FC_PORTSPEED bit values to ascii string name */
234 static const struct {
235 u32 value;
236 char *name;
237 } fc_port_speed_names[] = {
238 { FC_PORTSPEED_1GBIT, "1 Gbit" },
239 { FC_PORTSPEED_2GBIT, "2 Gbit" },
240 { FC_PORTSPEED_4GBIT, "4 Gbit" },
241 { FC_PORTSPEED_10GBIT, "10 Gbit" },
242 { FC_PORTSPEED_8GBIT, "8 Gbit" },
243 { FC_PORTSPEED_16GBIT, "16 Gbit" },
244 { FC_PORTSPEED_NOT_NEGOTIATED, "Not Negotiated" },
245 };
246 fc_bitfield_name_search(port_speed, fc_port_speed_names)
247
248
249 static int
250 show_fc_fc4s (char *buf, u8 *fc4_list)
251 {
252 int i, len=0;
253
254 for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
255 len += sprintf(buf + len , "0x%02x ", *fc4_list);
256 len += sprintf(buf + len, "\n");
257 return len;
258 }
259
260
261 /* Convert FC_PORT_ROLE bit values to ascii string name */
262 static const struct {
263 u32 value;
264 char *name;
265 } fc_port_role_names[] = {
266 { FC_PORT_ROLE_FCP_TARGET, "FCP Target" },
267 { FC_PORT_ROLE_FCP_INITIATOR, "FCP Initiator" },
268 { FC_PORT_ROLE_IP_PORT, "IP Port" },
269 };
270 fc_bitfield_name_search(port_roles, fc_port_role_names)
271
272 /*
273 * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
274 */
275 #define FC_WELLKNOWN_PORTID_MASK 0xfffff0
276 #define FC_WELLKNOWN_ROLE_MASK 0x00000f
277 #define FC_FPORT_PORTID 0x00000e
278 #define FC_FABCTLR_PORTID 0x00000d
279 #define FC_DIRSRVR_PORTID 0x00000c
280 #define FC_TIMESRVR_PORTID 0x00000b
281 #define FC_MGMTSRVR_PORTID 0x00000a
282
283
284 static void fc_timeout_deleted_rport(struct work_struct *work);
285 static void fc_timeout_fail_rport_io(struct work_struct *work);
286 static void fc_scsi_scan_rport(struct work_struct *work);
287
288 /*
289 * Attribute counts pre object type...
290 * Increase these values if you add attributes
291 */
292 #define FC_STARGET_NUM_ATTRS 3
293 #define FC_RPORT_NUM_ATTRS 10
294 #define FC_VPORT_NUM_ATTRS 9
295 #define FC_HOST_NUM_ATTRS 22
296
297 struct fc_internal {
298 struct scsi_transport_template t;
299 struct fc_function_template *f;
300
301 /*
302 * For attributes : each object has :
303 * An array of the actual attributes structures
304 * An array of null-terminated pointers to the attribute
305 * structures - used for mid-layer interaction.
306 *
307 * The attribute containers for the starget and host are are
308 * part of the midlayer. As the remote port is specific to the
309 * fc transport, we must provide the attribute container.
310 */
311 struct device_attribute private_starget_attrs[
312 FC_STARGET_NUM_ATTRS];
313 struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
314
315 struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
316 struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
317
318 struct transport_container rport_attr_cont;
319 struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
320 struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
321
322 struct transport_container vport_attr_cont;
323 struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
324 struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
325 };
326
327 #define to_fc_internal(tmpl) container_of(tmpl, struct fc_internal, t)
328
329 static int fc_target_setup(struct transport_container *tc, struct device *dev,
330 struct device *cdev)
331 {
332 struct scsi_target *starget = to_scsi_target(dev);
333 struct fc_rport *rport = starget_to_rport(starget);
334
335 /*
336 * if parent is remote port, use values from remote port.
337 * Otherwise, this host uses the fc_transport, but not the
338 * remote port interface. As such, initialize to known non-values.
339 */
340 if (rport) {
341 fc_starget_node_name(starget) = rport->node_name;
342 fc_starget_port_name(starget) = rport->port_name;
343 fc_starget_port_id(starget) = rport->port_id;
344 } else {
345 fc_starget_node_name(starget) = -1;
346 fc_starget_port_name(starget) = -1;
347 fc_starget_port_id(starget) = -1;
348 }
349
350 return 0;
351 }
352
353 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
354 "fc_transport",
355 fc_target_setup,
356 NULL,
357 NULL);
358
359 static int fc_host_setup(struct transport_container *tc, struct device *dev,
360 struct device *cdev)
361 {
362 struct Scsi_Host *shost = dev_to_shost(dev);
363 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
364
365 /*
366 * Set default values easily detected by the midlayer as
367 * failure cases. The scsi lldd is responsible for initializing
368 * all transport attributes to valid values per host.
369 */
370 fc_host->node_name = -1;
371 fc_host->port_name = -1;
372 fc_host->permanent_port_name = -1;
373 fc_host->supported_classes = FC_COS_UNSPECIFIED;
374 memset(fc_host->supported_fc4s, 0,
375 sizeof(fc_host->supported_fc4s));
376 fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
377 fc_host->maxframe_size = -1;
378 fc_host->max_npiv_vports = 0;
379 memset(fc_host->serial_number, 0,
380 sizeof(fc_host->serial_number));
381
382 fc_host->port_id = -1;
383 fc_host->port_type = FC_PORTTYPE_UNKNOWN;
384 fc_host->port_state = FC_PORTSTATE_UNKNOWN;
385 memset(fc_host->active_fc4s, 0,
386 sizeof(fc_host->active_fc4s));
387 fc_host->speed = FC_PORTSPEED_UNKNOWN;
388 fc_host->fabric_name = -1;
389 memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
390 memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
391
392 fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
393
394 INIT_LIST_HEAD(&fc_host->rports);
395 INIT_LIST_HEAD(&fc_host->rport_bindings);
396 INIT_LIST_HEAD(&fc_host->vports);
397 fc_host->next_rport_number = 0;
398 fc_host->next_target_id = 0;
399 fc_host->next_vport_number = 0;
400 fc_host->npiv_vports_inuse = 0;
401
402 snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
403 "fc_wq_%d", shost->host_no);
404 fc_host->work_q = create_singlethread_workqueue(
405 fc_host->work_q_name);
406 if (!fc_host->work_q)
407 return -ENOMEM;
408
409 snprintf(fc_host->devloss_work_q_name,
410 sizeof(fc_host->devloss_work_q_name),
411 "fc_dl_%d", shost->host_no);
412 fc_host->devloss_work_q = create_singlethread_workqueue(
413 fc_host->devloss_work_q_name);
414 if (!fc_host->devloss_work_q) {
415 destroy_workqueue(fc_host->work_q);
416 fc_host->work_q = NULL;
417 return -ENOMEM;
418 }
419
420 fc_bsg_hostadd(shost, fc_host);
421 /* ignore any bsg add error - we just can't do sgio */
422
423 return 0;
424 }
425
426 static int fc_host_remove(struct transport_container *tc, struct device *dev,
427 struct device *cdev)
428 {
429 struct Scsi_Host *shost = dev_to_shost(dev);
430 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
431
432 fc_bsg_remove(fc_host->rqst_q);
433 return 0;
434 }
435
436 static DECLARE_TRANSPORT_CLASS(fc_host_class,
437 "fc_host",
438 fc_host_setup,
439 fc_host_remove,
440 NULL);
441
442 /*
443 * Setup and Remove actions for remote ports are handled
444 * in the service functions below.
445 */
446 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
447 "fc_remote_ports",
448 NULL,
449 NULL,
450 NULL);
451
452 /*
453 * Setup and Remove actions for virtual ports are handled
454 * in the service functions below.
455 */
456 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
457 "fc_vports",
458 NULL,
459 NULL,
460 NULL);
461
462 /*
463 * Module Parameters
464 */
465
466 /*
467 * dev_loss_tmo: the default number of seconds that the FC transport
468 * should insulate the loss of a remote port.
469 * The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
470 */
471 static unsigned int fc_dev_loss_tmo = 60; /* seconds */
472
473 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
474 MODULE_PARM_DESC(dev_loss_tmo,
475 "Maximum number of seconds that the FC transport should"
476 " insulate the loss of a remote port. Once this value is"
477 " exceeded, the scsi target is removed. Value should be"
478 " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
479
480 /*
481 * Netlink Infrastructure
482 */
483
484 static atomic_t fc_event_seq;
485
486 /**
487 * fc_get_event_number - Obtain the next sequential FC event number
488 *
489 * Notes:
490 * We could have inlined this, but it would have required fc_event_seq to
491 * be exposed. For now, live with the subroutine call.
492 * Atomic used to avoid lock/unlock...
493 */
494 u32
495 fc_get_event_number(void)
496 {
497 return atomic_add_return(1, &fc_event_seq);
498 }
499 EXPORT_SYMBOL(fc_get_event_number);
500
501
502 /**
503 * fc_host_post_event - called to post an even on an fc_host.
504 * @shost: host the event occurred on
505 * @event_number: fc event number obtained from get_fc_event_number()
506 * @event_code: fc_host event being posted
507 * @event_data: 32bits of data for the event being posted
508 *
509 * Notes:
510 * This routine assumes no locks are held on entry.
511 */
512 void
513 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
514 enum fc_host_event_code event_code, u32 event_data)
515 {
516 struct sk_buff *skb;
517 struct nlmsghdr *nlh;
518 struct fc_nl_event *event;
519 const char *name;
520 u32 len, skblen;
521 int err;
522
523 if (!scsi_nl_sock) {
524 err = -ENOENT;
525 goto send_fail;
526 }
527
528 len = FC_NL_MSGALIGN(sizeof(*event));
529 skblen = NLMSG_SPACE(len);
530
531 skb = alloc_skb(skblen, GFP_KERNEL);
532 if (!skb) {
533 err = -ENOBUFS;
534 goto send_fail;
535 }
536
537 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
538 skblen - sizeof(*nlh), 0);
539 if (!nlh) {
540 err = -ENOBUFS;
541 goto send_fail_skb;
542 }
543 event = NLMSG_DATA(nlh);
544
545 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
546 FC_NL_ASYNC_EVENT, len);
547 event->seconds = get_seconds();
548 event->vendor_id = 0;
549 event->host_no = shost->host_no;
550 event->event_datalen = sizeof(u32); /* bytes */
551 event->event_num = event_number;
552 event->event_code = event_code;
553 event->event_data = event_data;
554
555 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
556 GFP_KERNEL);
557 return;
558
559 send_fail_skb:
560 kfree_skb(skb);
561 send_fail:
562 name = get_fc_host_event_code_name(event_code);
563 printk(KERN_WARNING
564 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
565 __func__, shost->host_no,
566 (name) ? name : "<unknown>", event_data, err);
567 return;
568 }
569 EXPORT_SYMBOL(fc_host_post_event);
570
571
572 /**
573 * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
574 * @shost: host the event occurred on
575 * @event_number: fc event number obtained from get_fc_event_number()
576 * @data_len: amount, in bytes, of vendor unique data
577 * @data_buf: pointer to vendor unique data
578 * @vendor_id: Vendor id
579 *
580 * Notes:
581 * This routine assumes no locks are held on entry.
582 */
583 void
584 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
585 u32 data_len, char * data_buf, u64 vendor_id)
586 {
587 struct sk_buff *skb;
588 struct nlmsghdr *nlh;
589 struct fc_nl_event *event;
590 u32 len, skblen;
591 int err;
592
593 if (!scsi_nl_sock) {
594 err = -ENOENT;
595 goto send_vendor_fail;
596 }
597
598 len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
599 skblen = NLMSG_SPACE(len);
600
601 skb = alloc_skb(skblen, GFP_KERNEL);
602 if (!skb) {
603 err = -ENOBUFS;
604 goto send_vendor_fail;
605 }
606
607 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
608 skblen - sizeof(*nlh), 0);
609 if (!nlh) {
610 err = -ENOBUFS;
611 goto send_vendor_fail_skb;
612 }
613 event = NLMSG_DATA(nlh);
614
615 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
616 FC_NL_ASYNC_EVENT, len);
617 event->seconds = get_seconds();
618 event->vendor_id = vendor_id;
619 event->host_no = shost->host_no;
620 event->event_datalen = data_len; /* bytes */
621 event->event_num = event_number;
622 event->event_code = FCH_EVT_VENDOR_UNIQUE;
623 memcpy(&event->event_data, data_buf, data_len);
624
625 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
626 GFP_KERNEL);
627 return;
628
629 send_vendor_fail_skb:
630 kfree_skb(skb);
631 send_vendor_fail:
632 printk(KERN_WARNING
633 "%s: Dropped Event : host %d vendor_unique - err %d\n",
634 __func__, shost->host_no, err);
635 return;
636 }
637 EXPORT_SYMBOL(fc_host_post_vendor_event);
638
639
640
641 static __init int fc_transport_init(void)
642 {
643 int error;
644
645 atomic_set(&fc_event_seq, 0);
646
647 error = transport_class_register(&fc_host_class);
648 if (error)
649 return error;
650 error = transport_class_register(&fc_vport_class);
651 if (error)
652 goto unreg_host_class;
653 error = transport_class_register(&fc_rport_class);
654 if (error)
655 goto unreg_vport_class;
656 error = transport_class_register(&fc_transport_class);
657 if (error)
658 goto unreg_rport_class;
659 return 0;
660
661 unreg_rport_class:
662 transport_class_unregister(&fc_rport_class);
663 unreg_vport_class:
664 transport_class_unregister(&fc_vport_class);
665 unreg_host_class:
666 transport_class_unregister(&fc_host_class);
667 return error;
668 }
669
670 static void __exit fc_transport_exit(void)
671 {
672 transport_class_unregister(&fc_transport_class);
673 transport_class_unregister(&fc_rport_class);
674 transport_class_unregister(&fc_host_class);
675 transport_class_unregister(&fc_vport_class);
676 }
677
678 /*
679 * FC Remote Port Attribute Management
680 */
681
682 #define fc_rport_show_function(field, format_string, sz, cast) \
683 static ssize_t \
684 show_fc_rport_##field (struct device *dev, \
685 struct device_attribute *attr, char *buf) \
686 { \
687 struct fc_rport *rport = transport_class_to_rport(dev); \
688 struct Scsi_Host *shost = rport_to_shost(rport); \
689 struct fc_internal *i = to_fc_internal(shost->transportt); \
690 if ((i->f->get_rport_##field) && \
691 !((rport->port_state == FC_PORTSTATE_BLOCKED) || \
692 (rport->port_state == FC_PORTSTATE_DELETED) || \
693 (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
694 i->f->get_rport_##field(rport); \
695 return snprintf(buf, sz, format_string, cast rport->field); \
696 }
697
698 #define fc_rport_store_function(field) \
699 static ssize_t \
700 store_fc_rport_##field(struct device *dev, \
701 struct device_attribute *attr, \
702 const char *buf, size_t count) \
703 { \
704 int val; \
705 struct fc_rport *rport = transport_class_to_rport(dev); \
706 struct Scsi_Host *shost = rport_to_shost(rport); \
707 struct fc_internal *i = to_fc_internal(shost->transportt); \
708 char *cp; \
709 if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
710 (rport->port_state == FC_PORTSTATE_DELETED) || \
711 (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
712 return -EBUSY; \
713 val = simple_strtoul(buf, &cp, 0); \
714 if (*cp && (*cp != '\n')) \
715 return -EINVAL; \
716 i->f->set_rport_##field(rport, val); \
717 return count; \
718 }
719
720 #define fc_rport_rd_attr(field, format_string, sz) \
721 fc_rport_show_function(field, format_string, sz, ) \
722 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
723 show_fc_rport_##field, NULL)
724
725 #define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
726 fc_rport_show_function(field, format_string, sz, (cast)) \
727 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
728 show_fc_rport_##field, NULL)
729
730 #define fc_rport_rw_attr(field, format_string, sz) \
731 fc_rport_show_function(field, format_string, sz, ) \
732 fc_rport_store_function(field) \
733 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
734 show_fc_rport_##field, \
735 store_fc_rport_##field)
736
737
738 #define fc_private_rport_show_function(field, format_string, sz, cast) \
739 static ssize_t \
740 show_fc_rport_##field (struct device *dev, \
741 struct device_attribute *attr, char *buf) \
742 { \
743 struct fc_rport *rport = transport_class_to_rport(dev); \
744 return snprintf(buf, sz, format_string, cast rport->field); \
745 }
746
747 #define fc_private_rport_rd_attr(field, format_string, sz) \
748 fc_private_rport_show_function(field, format_string, sz, ) \
749 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
750 show_fc_rport_##field, NULL)
751
752 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
753 fc_private_rport_show_function(field, format_string, sz, (cast)) \
754 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
755 show_fc_rport_##field, NULL)
756
757
758 #define fc_private_rport_rd_enum_attr(title, maxlen) \
759 static ssize_t \
760 show_fc_rport_##title (struct device *dev, \
761 struct device_attribute *attr, char *buf) \
762 { \
763 struct fc_rport *rport = transport_class_to_rport(dev); \
764 const char *name; \
765 name = get_fc_##title##_name(rport->title); \
766 if (!name) \
767 return -EINVAL; \
768 return snprintf(buf, maxlen, "%s\n", name); \
769 } \
770 static FC_DEVICE_ATTR(rport, title, S_IRUGO, \
771 show_fc_rport_##title, NULL)
772
773
774 #define SETUP_RPORT_ATTRIBUTE_RD(field) \
775 i->private_rport_attrs[count] = device_attr_rport_##field; \
776 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
777 i->private_rport_attrs[count].store = NULL; \
778 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
779 if (i->f->show_rport_##field) \
780 count++
781
782 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
783 i->private_rport_attrs[count] = device_attr_rport_##field; \
784 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
785 i->private_rport_attrs[count].store = NULL; \
786 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
787 count++
788
789 #define SETUP_RPORT_ATTRIBUTE_RW(field) \
790 i->private_rport_attrs[count] = device_attr_rport_##field; \
791 if (!i->f->set_rport_##field) { \
792 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
793 i->private_rport_attrs[count].store = NULL; \
794 } \
795 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
796 if (i->f->show_rport_##field) \
797 count++
798
799 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
800 { \
801 i->private_rport_attrs[count] = device_attr_rport_##field; \
802 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
803 count++; \
804 }
805
806
807 /* The FC Transport Remote Port Attributes: */
808
809 /* Fixed Remote Port Attributes */
810
811 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
812
813 static ssize_t
814 show_fc_rport_supported_classes (struct device *dev,
815 struct device_attribute *attr, char *buf)
816 {
817 struct fc_rport *rport = transport_class_to_rport(dev);
818 if (rport->supported_classes == FC_COS_UNSPECIFIED)
819 return snprintf(buf, 20, "unspecified\n");
820 return get_fc_cos_names(rport->supported_classes, buf);
821 }
822 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
823 show_fc_rport_supported_classes, NULL);
824
825 /* Dynamic Remote Port Attributes */
826
827 /*
828 * dev_loss_tmo attribute
829 */
830 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
831 static ssize_t
832 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
833 const char *buf, size_t count)
834 {
835 int val;
836 struct fc_rport *rport = transport_class_to_rport(dev);
837 struct Scsi_Host *shost = rport_to_shost(rport);
838 struct fc_internal *i = to_fc_internal(shost->transportt);
839 char *cp;
840 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
841 (rport->port_state == FC_PORTSTATE_DELETED) ||
842 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
843 return -EBUSY;
844 val = simple_strtoul(buf, &cp, 0);
845 if ((*cp && (*cp != '\n')) ||
846 (val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
847 return -EINVAL;
848 i->f->set_rport_dev_loss_tmo(rport, val);
849 return count;
850 }
851 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
852 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
853
854
855 /* Private Remote Port Attributes */
856
857 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
858 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
859 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
860
861 static ssize_t
862 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
863 char *buf)
864 {
865 struct fc_rport *rport = transport_class_to_rport(dev);
866
867 /* identify any roles that are port_id specific */
868 if ((rport->port_id != -1) &&
869 (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
870 FC_WELLKNOWN_PORTID_MASK) {
871 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
872 case FC_FPORT_PORTID:
873 return snprintf(buf, 30, "Fabric Port\n");
874 case FC_FABCTLR_PORTID:
875 return snprintf(buf, 30, "Fabric Controller\n");
876 case FC_DIRSRVR_PORTID:
877 return snprintf(buf, 30, "Directory Server\n");
878 case FC_TIMESRVR_PORTID:
879 return snprintf(buf, 30, "Time Server\n");
880 case FC_MGMTSRVR_PORTID:
881 return snprintf(buf, 30, "Management Server\n");
882 default:
883 return snprintf(buf, 30, "Unknown Fabric Entity\n");
884 }
885 } else {
886 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
887 return snprintf(buf, 20, "unknown\n");
888 return get_fc_port_roles_names(rport->roles, buf);
889 }
890 }
891 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
892 show_fc_rport_roles, NULL);
893
894 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
895 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
896
897 /*
898 * fast_io_fail_tmo attribute
899 */
900 static ssize_t
901 show_fc_rport_fast_io_fail_tmo (struct device *dev,
902 struct device_attribute *attr, char *buf)
903 {
904 struct fc_rport *rport = transport_class_to_rport(dev);
905
906 if (rport->fast_io_fail_tmo == -1)
907 return snprintf(buf, 5, "off\n");
908 return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
909 }
910
911 static ssize_t
912 store_fc_rport_fast_io_fail_tmo(struct device *dev,
913 struct device_attribute *attr, const char *buf,
914 size_t count)
915 {
916 int val;
917 char *cp;
918 struct fc_rport *rport = transport_class_to_rport(dev);
919
920 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
921 (rport->port_state == FC_PORTSTATE_DELETED) ||
922 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
923 return -EBUSY;
924 if (strncmp(buf, "off", 3) == 0)
925 rport->fast_io_fail_tmo = -1;
926 else {
927 val = simple_strtoul(buf, &cp, 0);
928 if ((*cp && (*cp != '\n')) ||
929 (val < 0) || (val >= rport->dev_loss_tmo))
930 return -EINVAL;
931 rport->fast_io_fail_tmo = val;
932 }
933 return count;
934 }
935 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
936 show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
937
938
939 /*
940 * FC SCSI Target Attribute Management
941 */
942
943 /*
944 * Note: in the target show function we recognize when the remote
945 * port is in the heirarchy and do not allow the driver to get
946 * involved in sysfs functions. The driver only gets involved if
947 * it's the "old" style that doesn't use rports.
948 */
949 #define fc_starget_show_function(field, format_string, sz, cast) \
950 static ssize_t \
951 show_fc_starget_##field (struct device *dev, \
952 struct device_attribute *attr, char *buf) \
953 { \
954 struct scsi_target *starget = transport_class_to_starget(dev); \
955 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
956 struct fc_internal *i = to_fc_internal(shost->transportt); \
957 struct fc_rport *rport = starget_to_rport(starget); \
958 if (rport) \
959 fc_starget_##field(starget) = rport->field; \
960 else if (i->f->get_starget_##field) \
961 i->f->get_starget_##field(starget); \
962 return snprintf(buf, sz, format_string, \
963 cast fc_starget_##field(starget)); \
964 }
965
966 #define fc_starget_rd_attr(field, format_string, sz) \
967 fc_starget_show_function(field, format_string, sz, ) \
968 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
969 show_fc_starget_##field, NULL)
970
971 #define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
972 fc_starget_show_function(field, format_string, sz, (cast)) \
973 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
974 show_fc_starget_##field, NULL)
975
976 #define SETUP_STARGET_ATTRIBUTE_RD(field) \
977 i->private_starget_attrs[count] = device_attr_starget_##field; \
978 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
979 i->private_starget_attrs[count].store = NULL; \
980 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
981 if (i->f->show_starget_##field) \
982 count++
983
984 #define SETUP_STARGET_ATTRIBUTE_RW(field) \
985 i->private_starget_attrs[count] = device_attr_starget_##field; \
986 if (!i->f->set_starget_##field) { \
987 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
988 i->private_starget_attrs[count].store = NULL; \
989 } \
990 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
991 if (i->f->show_starget_##field) \
992 count++
993
994 /* The FC Transport SCSI Target Attributes: */
995 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
996 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
997 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
998
999
1000 /*
1001 * FC Virtual Port Attribute Management
1002 */
1003
1004 #define fc_vport_show_function(field, format_string, sz, cast) \
1005 static ssize_t \
1006 show_fc_vport_##field (struct device *dev, \
1007 struct device_attribute *attr, char *buf) \
1008 { \
1009 struct fc_vport *vport = transport_class_to_vport(dev); \
1010 struct Scsi_Host *shost = vport_to_shost(vport); \
1011 struct fc_internal *i = to_fc_internal(shost->transportt); \
1012 if ((i->f->get_vport_##field) && \
1013 !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))) \
1014 i->f->get_vport_##field(vport); \
1015 return snprintf(buf, sz, format_string, cast vport->field); \
1016 }
1017
1018 #define fc_vport_store_function(field) \
1019 static ssize_t \
1020 store_fc_vport_##field(struct device *dev, \
1021 struct device_attribute *attr, \
1022 const char *buf, size_t count) \
1023 { \
1024 int val; \
1025 struct fc_vport *vport = transport_class_to_vport(dev); \
1026 struct Scsi_Host *shost = vport_to_shost(vport); \
1027 struct fc_internal *i = to_fc_internal(shost->transportt); \
1028 char *cp; \
1029 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1030 return -EBUSY; \
1031 val = simple_strtoul(buf, &cp, 0); \
1032 if (*cp && (*cp != '\n')) \
1033 return -EINVAL; \
1034 i->f->set_vport_##field(vport, val); \
1035 return count; \
1036 }
1037
1038 #define fc_vport_store_str_function(field, slen) \
1039 static ssize_t \
1040 store_fc_vport_##field(struct device *dev, \
1041 struct device_attribute *attr, \
1042 const char *buf, size_t count) \
1043 { \
1044 struct fc_vport *vport = transport_class_to_vport(dev); \
1045 struct Scsi_Host *shost = vport_to_shost(vport); \
1046 struct fc_internal *i = to_fc_internal(shost->transportt); \
1047 unsigned int cnt=count; \
1048 \
1049 /* count may include a LF at end of string */ \
1050 if (buf[cnt-1] == '\n') \
1051 cnt--; \
1052 if (cnt > ((slen) - 1)) \
1053 return -EINVAL; \
1054 memcpy(vport->field, buf, cnt); \
1055 i->f->set_vport_##field(vport); \
1056 return count; \
1057 }
1058
1059 #define fc_vport_rd_attr(field, format_string, sz) \
1060 fc_vport_show_function(field, format_string, sz, ) \
1061 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1062 show_fc_vport_##field, NULL)
1063
1064 #define fc_vport_rd_attr_cast(field, format_string, sz, cast) \
1065 fc_vport_show_function(field, format_string, sz, (cast)) \
1066 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1067 show_fc_vport_##field, NULL)
1068
1069 #define fc_vport_rw_attr(field, format_string, sz) \
1070 fc_vport_show_function(field, format_string, sz, ) \
1071 fc_vport_store_function(field) \
1072 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1073 show_fc_vport_##field, \
1074 store_fc_vport_##field)
1075
1076 #define fc_private_vport_show_function(field, format_string, sz, cast) \
1077 static ssize_t \
1078 show_fc_vport_##field (struct device *dev, \
1079 struct device_attribute *attr, char *buf) \
1080 { \
1081 struct fc_vport *vport = transport_class_to_vport(dev); \
1082 return snprintf(buf, sz, format_string, cast vport->field); \
1083 }
1084
1085 #define fc_private_vport_store_u32_function(field) \
1086 static ssize_t \
1087 store_fc_vport_##field(struct device *dev, \
1088 struct device_attribute *attr, \
1089 const char *buf, size_t count) \
1090 { \
1091 u32 val; \
1092 struct fc_vport *vport = transport_class_to_vport(dev); \
1093 char *cp; \
1094 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1095 return -EBUSY; \
1096 val = simple_strtoul(buf, &cp, 0); \
1097 if (*cp && (*cp != '\n')) \
1098 return -EINVAL; \
1099 vport->field = val; \
1100 return count; \
1101 }
1102
1103
1104 #define fc_private_vport_rd_attr(field, format_string, sz) \
1105 fc_private_vport_show_function(field, format_string, sz, ) \
1106 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1107 show_fc_vport_##field, NULL)
1108
1109 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast) \
1110 fc_private_vport_show_function(field, format_string, sz, (cast)) \
1111 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1112 show_fc_vport_##field, NULL)
1113
1114 #define fc_private_vport_rw_u32_attr(field, format_string, sz) \
1115 fc_private_vport_show_function(field, format_string, sz, ) \
1116 fc_private_vport_store_u32_function(field) \
1117 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1118 show_fc_vport_##field, \
1119 store_fc_vport_##field)
1120
1121
1122 #define fc_private_vport_rd_enum_attr(title, maxlen) \
1123 static ssize_t \
1124 show_fc_vport_##title (struct device *dev, \
1125 struct device_attribute *attr, \
1126 char *buf) \
1127 { \
1128 struct fc_vport *vport = transport_class_to_vport(dev); \
1129 const char *name; \
1130 name = get_fc_##title##_name(vport->title); \
1131 if (!name) \
1132 return -EINVAL; \
1133 return snprintf(buf, maxlen, "%s\n", name); \
1134 } \
1135 static FC_DEVICE_ATTR(vport, title, S_IRUGO, \
1136 show_fc_vport_##title, NULL)
1137
1138
1139 #define SETUP_VPORT_ATTRIBUTE_RD(field) \
1140 i->private_vport_attrs[count] = device_attr_vport_##field; \
1141 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1142 i->private_vport_attrs[count].store = NULL; \
1143 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1144 if (i->f->get_##field) \
1145 count++
1146 /* NOTE: Above MACRO differs: checks function not show bit */
1147
1148 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field) \
1149 i->private_vport_attrs[count] = device_attr_vport_##field; \
1150 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1151 i->private_vport_attrs[count].store = NULL; \
1152 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1153 count++
1154
1155 #define SETUP_VPORT_ATTRIBUTE_WR(field) \
1156 i->private_vport_attrs[count] = device_attr_vport_##field; \
1157 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1158 if (i->f->field) \
1159 count++
1160 /* NOTE: Above MACRO differs: checks function */
1161
1162 #define SETUP_VPORT_ATTRIBUTE_RW(field) \
1163 i->private_vport_attrs[count] = device_attr_vport_##field; \
1164 if (!i->f->set_vport_##field) { \
1165 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1166 i->private_vport_attrs[count].store = NULL; \
1167 } \
1168 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1169 count++
1170 /* NOTE: Above MACRO differs: does not check show bit */
1171
1172 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field) \
1173 { \
1174 i->private_vport_attrs[count] = device_attr_vport_##field; \
1175 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1176 count++; \
1177 }
1178
1179
1180 /* The FC Transport Virtual Port Attributes: */
1181
1182 /* Fixed Virtual Port Attributes */
1183
1184 /* Dynamic Virtual Port Attributes */
1185
1186 /* Private Virtual Port Attributes */
1187
1188 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1189 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1190 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1191 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1192
1193 static ssize_t
1194 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1195 char *buf)
1196 {
1197 struct fc_vport *vport = transport_class_to_vport(dev);
1198
1199 if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1200 return snprintf(buf, 20, "unknown\n");
1201 return get_fc_port_roles_names(vport->roles, buf);
1202 }
1203 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1204
1205 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1206
1207 fc_private_vport_show_function(symbolic_name, "%s\n",
1208 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1209 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1210 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1211 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1212
1213 static ssize_t
1214 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1215 const char *buf, size_t count)
1216 {
1217 struct fc_vport *vport = transport_class_to_vport(dev);
1218 struct Scsi_Host *shost = vport_to_shost(vport);
1219
1220 fc_queue_work(shost, &vport->vport_delete_work);
1221 return count;
1222 }
1223 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1224 NULL, store_fc_vport_delete);
1225
1226
1227 /*
1228 * Enable/Disable vport
1229 * Write "1" to disable, write "0" to enable
1230 */
1231 static ssize_t
1232 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1233 const char *buf,
1234 size_t count)
1235 {
1236 struct fc_vport *vport = transport_class_to_vport(dev);
1237 struct Scsi_Host *shost = vport_to_shost(vport);
1238 struct fc_internal *i = to_fc_internal(shost->transportt);
1239 int stat;
1240
1241 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1242 return -EBUSY;
1243
1244 if (*buf == '0') {
1245 if (vport->vport_state != FC_VPORT_DISABLED)
1246 return -EALREADY;
1247 } else if (*buf == '1') {
1248 if (vport->vport_state == FC_VPORT_DISABLED)
1249 return -EALREADY;
1250 } else
1251 return -EINVAL;
1252
1253 stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1254 return stat ? stat : count;
1255 }
1256 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1257 NULL, store_fc_vport_disable);
1258
1259
1260 /*
1261 * Host Attribute Management
1262 */
1263
1264 #define fc_host_show_function(field, format_string, sz, cast) \
1265 static ssize_t \
1266 show_fc_host_##field (struct device *dev, \
1267 struct device_attribute *attr, char *buf) \
1268 { \
1269 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1270 struct fc_internal *i = to_fc_internal(shost->transportt); \
1271 if (i->f->get_host_##field) \
1272 i->f->get_host_##field(shost); \
1273 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1274 }
1275
1276 #define fc_host_store_function(field) \
1277 static ssize_t \
1278 store_fc_host_##field(struct device *dev, \
1279 struct device_attribute *attr, \
1280 const char *buf, size_t count) \
1281 { \
1282 int val; \
1283 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1284 struct fc_internal *i = to_fc_internal(shost->transportt); \
1285 char *cp; \
1286 \
1287 val = simple_strtoul(buf, &cp, 0); \
1288 if (*cp && (*cp != '\n')) \
1289 return -EINVAL; \
1290 i->f->set_host_##field(shost, val); \
1291 return count; \
1292 }
1293
1294 #define fc_host_store_str_function(field, slen) \
1295 static ssize_t \
1296 store_fc_host_##field(struct device *dev, \
1297 struct device_attribute *attr, \
1298 const char *buf, size_t count) \
1299 { \
1300 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1301 struct fc_internal *i = to_fc_internal(shost->transportt); \
1302 unsigned int cnt=count; \
1303 \
1304 /* count may include a LF at end of string */ \
1305 if (buf[cnt-1] == '\n') \
1306 cnt--; \
1307 if (cnt > ((slen) - 1)) \
1308 return -EINVAL; \
1309 memcpy(fc_host_##field(shost), buf, cnt); \
1310 i->f->set_host_##field(shost); \
1311 return count; \
1312 }
1313
1314 #define fc_host_rd_attr(field, format_string, sz) \
1315 fc_host_show_function(field, format_string, sz, ) \
1316 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1317 show_fc_host_##field, NULL)
1318
1319 #define fc_host_rd_attr_cast(field, format_string, sz, cast) \
1320 fc_host_show_function(field, format_string, sz, (cast)) \
1321 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1322 show_fc_host_##field, NULL)
1323
1324 #define fc_host_rw_attr(field, format_string, sz) \
1325 fc_host_show_function(field, format_string, sz, ) \
1326 fc_host_store_function(field) \
1327 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
1328 show_fc_host_##field, \
1329 store_fc_host_##field)
1330
1331 #define fc_host_rd_enum_attr(title, maxlen) \
1332 static ssize_t \
1333 show_fc_host_##title (struct device *dev, \
1334 struct device_attribute *attr, char *buf) \
1335 { \
1336 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1337 struct fc_internal *i = to_fc_internal(shost->transportt); \
1338 const char *name; \
1339 if (i->f->get_host_##title) \
1340 i->f->get_host_##title(shost); \
1341 name = get_fc_##title##_name(fc_host_##title(shost)); \
1342 if (!name) \
1343 return -EINVAL; \
1344 return snprintf(buf, maxlen, "%s\n", name); \
1345 } \
1346 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1347
1348 #define SETUP_HOST_ATTRIBUTE_RD(field) \
1349 i->private_host_attrs[count] = device_attr_host_##field; \
1350 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1351 i->private_host_attrs[count].store = NULL; \
1352 i->host_attrs[count] = &i->private_host_attrs[count]; \
1353 if (i->f->show_host_##field) \
1354 count++
1355
1356 #define SETUP_HOST_ATTRIBUTE_RD_NS(field) \
1357 i->private_host_attrs[count] = device_attr_host_##field; \
1358 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1359 i->private_host_attrs[count].store = NULL; \
1360 i->host_attrs[count] = &i->private_host_attrs[count]; \
1361 count++
1362
1363 #define SETUP_HOST_ATTRIBUTE_RW(field) \
1364 i->private_host_attrs[count] = device_attr_host_##field; \
1365 if (!i->f->set_host_##field) { \
1366 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1367 i->private_host_attrs[count].store = NULL; \
1368 } \
1369 i->host_attrs[count] = &i->private_host_attrs[count]; \
1370 if (i->f->show_host_##field) \
1371 count++
1372
1373
1374 #define fc_private_host_show_function(field, format_string, sz, cast) \
1375 static ssize_t \
1376 show_fc_host_##field (struct device *dev, \
1377 struct device_attribute *attr, char *buf) \
1378 { \
1379 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1380 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1381 }
1382
1383 #define fc_private_host_rd_attr(field, format_string, sz) \
1384 fc_private_host_show_function(field, format_string, sz, ) \
1385 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1386 show_fc_host_##field, NULL)
1387
1388 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
1389 fc_private_host_show_function(field, format_string, sz, (cast)) \
1390 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1391 show_fc_host_##field, NULL)
1392
1393 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
1394 i->private_host_attrs[count] = device_attr_host_##field; \
1395 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1396 i->private_host_attrs[count].store = NULL; \
1397 i->host_attrs[count] = &i->private_host_attrs[count]; \
1398 count++
1399
1400 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
1401 { \
1402 i->private_host_attrs[count] = device_attr_host_##field; \
1403 i->host_attrs[count] = &i->private_host_attrs[count]; \
1404 count++; \
1405 }
1406
1407
1408 /* Fixed Host Attributes */
1409
1410 static ssize_t
1411 show_fc_host_supported_classes (struct device *dev,
1412 struct device_attribute *attr, char *buf)
1413 {
1414 struct Scsi_Host *shost = transport_class_to_shost(dev);
1415
1416 if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1417 return snprintf(buf, 20, "unspecified\n");
1418
1419 return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1420 }
1421 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1422 show_fc_host_supported_classes, NULL);
1423
1424 static ssize_t
1425 show_fc_host_supported_fc4s (struct device *dev,
1426 struct device_attribute *attr, char *buf)
1427 {
1428 struct Scsi_Host *shost = transport_class_to_shost(dev);
1429 return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1430 }
1431 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1432 show_fc_host_supported_fc4s, NULL);
1433
1434 static ssize_t
1435 show_fc_host_supported_speeds (struct device *dev,
1436 struct device_attribute *attr, char *buf)
1437 {
1438 struct Scsi_Host *shost = transport_class_to_shost(dev);
1439
1440 if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1441 return snprintf(buf, 20, "unknown\n");
1442
1443 return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1444 }
1445 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1446 show_fc_host_supported_speeds, NULL);
1447
1448
1449 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1450 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1451 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1452 unsigned long long);
1453 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1454 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1455 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1456
1457
1458 /* Dynamic Host Attributes */
1459
1460 static ssize_t
1461 show_fc_host_active_fc4s (struct device *dev,
1462 struct device_attribute *attr, char *buf)
1463 {
1464 struct Scsi_Host *shost = transport_class_to_shost(dev);
1465 struct fc_internal *i = to_fc_internal(shost->transportt);
1466
1467 if (i->f->get_host_active_fc4s)
1468 i->f->get_host_active_fc4s(shost);
1469
1470 return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1471 }
1472 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1473 show_fc_host_active_fc4s, NULL);
1474
1475 static ssize_t
1476 show_fc_host_speed (struct device *dev,
1477 struct device_attribute *attr, char *buf)
1478 {
1479 struct Scsi_Host *shost = transport_class_to_shost(dev);
1480 struct fc_internal *i = to_fc_internal(shost->transportt);
1481
1482 if (i->f->get_host_speed)
1483 i->f->get_host_speed(shost);
1484
1485 if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1486 return snprintf(buf, 20, "unknown\n");
1487
1488 return get_fc_port_speed_names(fc_host_speed(shost), buf);
1489 }
1490 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1491 show_fc_host_speed, NULL);
1492
1493
1494 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1495 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1496 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1497 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1498 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1499
1500 fc_private_host_show_function(system_hostname, "%s\n",
1501 FC_SYMBOLIC_NAME_SIZE + 1, )
1502 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1503 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1504 show_fc_host_system_hostname, store_fc_host_system_hostname);
1505
1506
1507 /* Private Host Attributes */
1508
1509 static ssize_t
1510 show_fc_private_host_tgtid_bind_type(struct device *dev,
1511 struct device_attribute *attr, char *buf)
1512 {
1513 struct Scsi_Host *shost = transport_class_to_shost(dev);
1514 const char *name;
1515
1516 name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1517 if (!name)
1518 return -EINVAL;
1519 return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1520 }
1521
1522 #define get_list_head_entry(pos, head, member) \
1523 pos = list_entry((head)->next, typeof(*pos), member)
1524
1525 static ssize_t
1526 store_fc_private_host_tgtid_bind_type(struct device *dev,
1527 struct device_attribute *attr, const char *buf, size_t count)
1528 {
1529 struct Scsi_Host *shost = transport_class_to_shost(dev);
1530 struct fc_rport *rport;
1531 enum fc_tgtid_binding_type val;
1532 unsigned long flags;
1533
1534 if (get_fc_tgtid_bind_type_match(buf, &val))
1535 return -EINVAL;
1536
1537 /* if changing bind type, purge all unused consistent bindings */
1538 if (val != fc_host_tgtid_bind_type(shost)) {
1539 spin_lock_irqsave(shost->host_lock, flags);
1540 while (!list_empty(&fc_host_rport_bindings(shost))) {
1541 get_list_head_entry(rport,
1542 &fc_host_rport_bindings(shost), peers);
1543 list_del(&rport->peers);
1544 rport->port_state = FC_PORTSTATE_DELETED;
1545 fc_queue_work(shost, &rport->rport_delete_work);
1546 }
1547 spin_unlock_irqrestore(shost->host_lock, flags);
1548 }
1549
1550 fc_host_tgtid_bind_type(shost) = val;
1551 return count;
1552 }
1553
1554 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1555 show_fc_private_host_tgtid_bind_type,
1556 store_fc_private_host_tgtid_bind_type);
1557
1558 static ssize_t
1559 store_fc_private_host_issue_lip(struct device *dev,
1560 struct device_attribute *attr, const char *buf, size_t count)
1561 {
1562 struct Scsi_Host *shost = transport_class_to_shost(dev);
1563 struct fc_internal *i = to_fc_internal(shost->transportt);
1564 int ret;
1565
1566 /* ignore any data value written to the attribute */
1567 if (i->f->issue_fc_host_lip) {
1568 ret = i->f->issue_fc_host_lip(shost);
1569 return ret ? ret: count;
1570 }
1571
1572 return -ENOENT;
1573 }
1574
1575 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1576 store_fc_private_host_issue_lip);
1577
1578 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1579
1580
1581 /*
1582 * Host Statistics Management
1583 */
1584
1585 /* Show a given an attribute in the statistics group */
1586 static ssize_t
1587 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1588 {
1589 struct Scsi_Host *shost = transport_class_to_shost(dev);
1590 struct fc_internal *i = to_fc_internal(shost->transportt);
1591 struct fc_host_statistics *stats;
1592 ssize_t ret = -ENOENT;
1593
1594 if (offset > sizeof(struct fc_host_statistics) ||
1595 offset % sizeof(u64) != 0)
1596 WARN_ON(1);
1597
1598 if (i->f->get_fc_host_stats) {
1599 stats = (i->f->get_fc_host_stats)(shost);
1600 if (stats)
1601 ret = snprintf(buf, 20, "0x%llx\n",
1602 (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1603 }
1604 return ret;
1605 }
1606
1607
1608 /* generate a read-only statistics attribute */
1609 #define fc_host_statistic(name) \
1610 static ssize_t show_fcstat_##name(struct device *cd, \
1611 struct device_attribute *attr, \
1612 char *buf) \
1613 { \
1614 return fc_stat_show(cd, buf, \
1615 offsetof(struct fc_host_statistics, name)); \
1616 } \
1617 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1618
1619 fc_host_statistic(seconds_since_last_reset);
1620 fc_host_statistic(tx_frames);
1621 fc_host_statistic(tx_words);
1622 fc_host_statistic(rx_frames);
1623 fc_host_statistic(rx_words);
1624 fc_host_statistic(lip_count);
1625 fc_host_statistic(nos_count);
1626 fc_host_statistic(error_frames);
1627 fc_host_statistic(dumped_frames);
1628 fc_host_statistic(link_failure_count);
1629 fc_host_statistic(loss_of_sync_count);
1630 fc_host_statistic(loss_of_signal_count);
1631 fc_host_statistic(prim_seq_protocol_err_count);
1632 fc_host_statistic(invalid_tx_word_count);
1633 fc_host_statistic(invalid_crc_count);
1634 fc_host_statistic(fcp_input_requests);
1635 fc_host_statistic(fcp_output_requests);
1636 fc_host_statistic(fcp_control_requests);
1637 fc_host_statistic(fcp_input_megabytes);
1638 fc_host_statistic(fcp_output_megabytes);
1639
1640 static ssize_t
1641 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1642 const char *buf, size_t count)
1643 {
1644 struct Scsi_Host *shost = transport_class_to_shost(dev);
1645 struct fc_internal *i = to_fc_internal(shost->transportt);
1646
1647 /* ignore any data value written to the attribute */
1648 if (i->f->reset_fc_host_stats) {
1649 i->f->reset_fc_host_stats(shost);
1650 return count;
1651 }
1652
1653 return -ENOENT;
1654 }
1655 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1656 fc_reset_statistics);
1657
1658 static struct attribute *fc_statistics_attrs[] = {
1659 &device_attr_host_seconds_since_last_reset.attr,
1660 &device_attr_host_tx_frames.attr,
1661 &device_attr_host_tx_words.attr,
1662 &device_attr_host_rx_frames.attr,
1663 &device_attr_host_rx_words.attr,
1664 &device_attr_host_lip_count.attr,
1665 &device_attr_host_nos_count.attr,
1666 &device_attr_host_error_frames.attr,
1667 &device_attr_host_dumped_frames.attr,
1668 &device_attr_host_link_failure_count.attr,
1669 &device_attr_host_loss_of_sync_count.attr,
1670 &device_attr_host_loss_of_signal_count.attr,
1671 &device_attr_host_prim_seq_protocol_err_count.attr,
1672 &device_attr_host_invalid_tx_word_count.attr,
1673 &device_attr_host_invalid_crc_count.attr,
1674 &device_attr_host_fcp_input_requests.attr,
1675 &device_attr_host_fcp_output_requests.attr,
1676 &device_attr_host_fcp_control_requests.attr,
1677 &device_attr_host_fcp_input_megabytes.attr,
1678 &device_attr_host_fcp_output_megabytes.attr,
1679 &device_attr_host_reset_statistics.attr,
1680 NULL
1681 };
1682
1683 static struct attribute_group fc_statistics_group = {
1684 .name = "statistics",
1685 .attrs = fc_statistics_attrs,
1686 };
1687
1688
1689 /* Host Vport Attributes */
1690
1691 static int
1692 fc_parse_wwn(const char *ns, u64 *nm)
1693 {
1694 unsigned int i, j;
1695 u8 wwn[8];
1696
1697 memset(wwn, 0, sizeof(wwn));
1698
1699 /* Validate and store the new name */
1700 for (i=0, j=0; i < 16; i++) {
1701 if ((*ns >= 'a') && (*ns <= 'f'))
1702 j = ((j << 4) | ((*ns++ -'a') + 10));
1703 else if ((*ns >= 'A') && (*ns <= 'F'))
1704 j = ((j << 4) | ((*ns++ -'A') + 10));
1705 else if ((*ns >= '0') && (*ns <= '9'))
1706 j = ((j << 4) | (*ns++ -'0'));
1707 else
1708 return -EINVAL;
1709 if (i % 2) {
1710 wwn[i/2] = j & 0xff;
1711 j = 0;
1712 }
1713 }
1714
1715 *nm = wwn_to_u64(wwn);
1716
1717 return 0;
1718 }
1719
1720
1721 /*
1722 * "Short-cut" sysfs variable to create a new vport on a FC Host.
1723 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1724 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1725 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1726 */
1727 static ssize_t
1728 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1729 const char *buf, size_t count)
1730 {
1731 struct Scsi_Host *shost = transport_class_to_shost(dev);
1732 struct fc_vport_identifiers vid;
1733 struct fc_vport *vport;
1734 unsigned int cnt=count;
1735 int stat;
1736
1737 memset(&vid, 0, sizeof(vid));
1738
1739 /* count may include a LF at end of string */
1740 if (buf[cnt-1] == '\n')
1741 cnt--;
1742
1743 /* validate we have enough characters for WWPN */
1744 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1745 return -EINVAL;
1746
1747 stat = fc_parse_wwn(&buf[0], &vid.port_name);
1748 if (stat)
1749 return stat;
1750
1751 stat = fc_parse_wwn(&buf[17], &vid.node_name);
1752 if (stat)
1753 return stat;
1754
1755 vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1756 vid.vport_type = FC_PORTTYPE_NPIV;
1757 /* vid.symbolic_name is already zero/NULL's */
1758 vid.disable = false; /* always enabled */
1759
1760 /* we only allow support on Channel 0 !!! */
1761 stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1762 return stat ? stat : count;
1763 }
1764 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1765 store_fc_host_vport_create);
1766
1767
1768 /*
1769 * "Short-cut" sysfs variable to delete a vport on a FC Host.
1770 * Vport is identified by a string containing "<WWPN>:<WWNN>".
1771 * The WWNs are specified as hex characters, and may *not* contain
1772 * any prefixes (e.g. 0x, x, etc)
1773 */
1774 static ssize_t
1775 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1776 const char *buf, size_t count)
1777 {
1778 struct Scsi_Host *shost = transport_class_to_shost(dev);
1779 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1780 struct fc_vport *vport;
1781 u64 wwpn, wwnn;
1782 unsigned long flags;
1783 unsigned int cnt=count;
1784 int stat, match;
1785
1786 /* count may include a LF at end of string */
1787 if (buf[cnt-1] == '\n')
1788 cnt--;
1789
1790 /* validate we have enough characters for WWPN */
1791 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1792 return -EINVAL;
1793
1794 stat = fc_parse_wwn(&buf[0], &wwpn);
1795 if (stat)
1796 return stat;
1797
1798 stat = fc_parse_wwn(&buf[17], &wwnn);
1799 if (stat)
1800 return stat;
1801
1802 spin_lock_irqsave(shost->host_lock, flags);
1803 match = 0;
1804 /* we only allow support on Channel 0 !!! */
1805 list_for_each_entry(vport, &fc_host->vports, peers) {
1806 if ((vport->channel == 0) &&
1807 (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1808 match = 1;
1809 break;
1810 }
1811 }
1812 spin_unlock_irqrestore(shost->host_lock, flags);
1813
1814 if (!match)
1815 return -ENODEV;
1816
1817 stat = fc_vport_terminate(vport);
1818 return stat ? stat : count;
1819 }
1820 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1821 store_fc_host_vport_delete);
1822
1823
1824 static int fc_host_match(struct attribute_container *cont,
1825 struct device *dev)
1826 {
1827 struct Scsi_Host *shost;
1828 struct fc_internal *i;
1829
1830 if (!scsi_is_host_device(dev))
1831 return 0;
1832
1833 shost = dev_to_shost(dev);
1834 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1835 != &fc_host_class.class)
1836 return 0;
1837
1838 i = to_fc_internal(shost->transportt);
1839
1840 return &i->t.host_attrs.ac == cont;
1841 }
1842
1843 static int fc_target_match(struct attribute_container *cont,
1844 struct device *dev)
1845 {
1846 struct Scsi_Host *shost;
1847 struct fc_internal *i;
1848
1849 if (!scsi_is_target_device(dev))
1850 return 0;
1851
1852 shost = dev_to_shost(dev->parent);
1853 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1854 != &fc_host_class.class)
1855 return 0;
1856
1857 i = to_fc_internal(shost->transportt);
1858
1859 return &i->t.target_attrs.ac == cont;
1860 }
1861
1862 static void fc_rport_dev_release(struct device *dev)
1863 {
1864 struct fc_rport *rport = dev_to_rport(dev);
1865 put_device(dev->parent);
1866 kfree(rport);
1867 }
1868
1869 int scsi_is_fc_rport(const struct device *dev)
1870 {
1871 return dev->release == fc_rport_dev_release;
1872 }
1873 EXPORT_SYMBOL(scsi_is_fc_rport);
1874
1875 static int fc_rport_match(struct attribute_container *cont,
1876 struct device *dev)
1877 {
1878 struct Scsi_Host *shost;
1879 struct fc_internal *i;
1880
1881 if (!scsi_is_fc_rport(dev))
1882 return 0;
1883
1884 shost = dev_to_shost(dev->parent);
1885 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1886 != &fc_host_class.class)
1887 return 0;
1888
1889 i = to_fc_internal(shost->transportt);
1890
1891 return &i->rport_attr_cont.ac == cont;
1892 }
1893
1894
1895 static void fc_vport_dev_release(struct device *dev)
1896 {
1897 struct fc_vport *vport = dev_to_vport(dev);
1898 put_device(dev->parent); /* release kobj parent */
1899 kfree(vport);
1900 }
1901
1902 int scsi_is_fc_vport(const struct device *dev)
1903 {
1904 return dev->release == fc_vport_dev_release;
1905 }
1906 EXPORT_SYMBOL(scsi_is_fc_vport);
1907
1908 static int fc_vport_match(struct attribute_container *cont,
1909 struct device *dev)
1910 {
1911 struct fc_vport *vport;
1912 struct Scsi_Host *shost;
1913 struct fc_internal *i;
1914
1915 if (!scsi_is_fc_vport(dev))
1916 return 0;
1917 vport = dev_to_vport(dev);
1918
1919 shost = vport_to_shost(vport);
1920 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1921 != &fc_host_class.class)
1922 return 0;
1923
1924 i = to_fc_internal(shost->transportt);
1925 return &i->vport_attr_cont.ac == cont;
1926 }
1927
1928
1929 /**
1930 * fc_timed_out - FC Transport I/O timeout intercept handler
1931 * @scmd: The SCSI command which timed out
1932 *
1933 * This routine protects against error handlers getting invoked while a
1934 * rport is in a blocked state, typically due to a temporarily loss of
1935 * connectivity. If the error handlers are allowed to proceed, requests
1936 * to abort i/o, reset the target, etc will likely fail as there is no way
1937 * to communicate with the device to perform the requested function. These
1938 * failures may result in the midlayer taking the device offline, requiring
1939 * manual intervention to restore operation.
1940 *
1941 * This routine, called whenever an i/o times out, validates the state of
1942 * the underlying rport. If the rport is blocked, it returns
1943 * EH_RESET_TIMER, which will continue to reschedule the timeout.
1944 * Eventually, either the device will return, or devloss_tmo will fire,
1945 * and when the timeout then fires, it will be handled normally.
1946 * If the rport is not blocked, normal error handling continues.
1947 *
1948 * Notes:
1949 * This routine assumes no locks are held on entry.
1950 */
1951 static enum blk_eh_timer_return
1952 fc_timed_out(struct scsi_cmnd *scmd)
1953 {
1954 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1955
1956 if (rport->port_state == FC_PORTSTATE_BLOCKED)
1957 return BLK_EH_RESET_TIMER;
1958
1959 return BLK_EH_NOT_HANDLED;
1960 }
1961
1962 /*
1963 * Called by fc_user_scan to locate an rport on the shost that
1964 * matches the channel and target id, and invoke scsi_scan_target()
1965 * on the rport.
1966 */
1967 static void
1968 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1969 {
1970 struct fc_rport *rport;
1971 unsigned long flags;
1972
1973 spin_lock_irqsave(shost->host_lock, flags);
1974
1975 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1976 if (rport->scsi_target_id == -1)
1977 continue;
1978
1979 if (rport->port_state != FC_PORTSTATE_ONLINE)
1980 continue;
1981
1982 if ((channel == rport->channel) &&
1983 (id == rport->scsi_target_id)) {
1984 spin_unlock_irqrestore(shost->host_lock, flags);
1985 scsi_scan_target(&rport->dev, channel, id, lun, 1);
1986 return;
1987 }
1988 }
1989
1990 spin_unlock_irqrestore(shost->host_lock, flags);
1991 }
1992
1993 /*
1994 * Called via sysfs scan routines. Necessary, as the FC transport
1995 * wants to place all target objects below the rport object. So this
1996 * routine must invoke the scsi_scan_target() routine with the rport
1997 * object as the parent.
1998 */
1999 static int
2000 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2001 {
2002 uint chlo, chhi;
2003 uint tgtlo, tgthi;
2004
2005 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2006 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2007 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2008 return -EINVAL;
2009
2010 if (channel == SCAN_WILD_CARD) {
2011 chlo = 0;
2012 chhi = shost->max_channel + 1;
2013 } else {
2014 chlo = channel;
2015 chhi = channel + 1;
2016 }
2017
2018 if (id == SCAN_WILD_CARD) {
2019 tgtlo = 0;
2020 tgthi = shost->max_id;
2021 } else {
2022 tgtlo = id;
2023 tgthi = id + 1;
2024 }
2025
2026 for ( ; chlo < chhi; chlo++)
2027 for ( ; tgtlo < tgthi; tgtlo++)
2028 fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2029
2030 return 0;
2031 }
2032
2033 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2034 int result)
2035 {
2036 struct fc_internal *i = to_fc_internal(shost->transportt);
2037 return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2038 }
2039
2040 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2041 {
2042 struct fc_internal *i = to_fc_internal(shost->transportt);
2043 return i->f->it_nexus_response(shost, nexus, result);
2044 }
2045
2046 struct scsi_transport_template *
2047 fc_attach_transport(struct fc_function_template *ft)
2048 {
2049 int count;
2050 struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2051 GFP_KERNEL);
2052
2053 if (unlikely(!i))
2054 return NULL;
2055
2056 i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2057 i->t.target_attrs.ac.class = &fc_transport_class.class;
2058 i->t.target_attrs.ac.match = fc_target_match;
2059 i->t.target_size = sizeof(struct fc_starget_attrs);
2060 transport_container_register(&i->t.target_attrs);
2061
2062 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2063 i->t.host_attrs.ac.class = &fc_host_class.class;
2064 i->t.host_attrs.ac.match = fc_host_match;
2065 i->t.host_size = sizeof(struct fc_host_attrs);
2066 if (ft->get_fc_host_stats)
2067 i->t.host_attrs.statistics = &fc_statistics_group;
2068 transport_container_register(&i->t.host_attrs);
2069
2070 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2071 i->rport_attr_cont.ac.class = &fc_rport_class.class;
2072 i->rport_attr_cont.ac.match = fc_rport_match;
2073 transport_container_register(&i->rport_attr_cont);
2074
2075 i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2076 i->vport_attr_cont.ac.class = &fc_vport_class.class;
2077 i->vport_attr_cont.ac.match = fc_vport_match;
2078 transport_container_register(&i->vport_attr_cont);
2079
2080 i->f = ft;
2081
2082 /* Transport uses the shost workq for scsi scanning */
2083 i->t.create_work_queue = 1;
2084
2085 i->t.eh_timed_out = fc_timed_out;
2086
2087 i->t.user_scan = fc_user_scan;
2088
2089 /* target-mode drivers' functions */
2090 i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2091 i->t.it_nexus_response = fc_it_nexus_response;
2092
2093 /*
2094 * Setup SCSI Target Attributes.
2095 */
2096 count = 0;
2097 SETUP_STARGET_ATTRIBUTE_RD(node_name);
2098 SETUP_STARGET_ATTRIBUTE_RD(port_name);
2099 SETUP_STARGET_ATTRIBUTE_RD(port_id);
2100
2101 BUG_ON(count > FC_STARGET_NUM_ATTRS);
2102
2103 i->starget_attrs[count] = NULL;
2104
2105
2106 /*
2107 * Setup SCSI Host Attributes.
2108 */
2109 count=0;
2110 SETUP_HOST_ATTRIBUTE_RD(node_name);
2111 SETUP_HOST_ATTRIBUTE_RD(port_name);
2112 SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2113 SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2114 SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2115 SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2116 SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2117 if (ft->vport_create) {
2118 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2119 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2120 }
2121 SETUP_HOST_ATTRIBUTE_RD(serial_number);
2122
2123 SETUP_HOST_ATTRIBUTE_RD(port_id);
2124 SETUP_HOST_ATTRIBUTE_RD(port_type);
2125 SETUP_HOST_ATTRIBUTE_RD(port_state);
2126 SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2127 SETUP_HOST_ATTRIBUTE_RD(speed);
2128 SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2129 SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2130 SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2131
2132 /* Transport-managed attributes */
2133 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2134 if (ft->issue_fc_host_lip)
2135 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2136 if (ft->vport_create)
2137 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2138 if (ft->vport_delete)
2139 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2140
2141 BUG_ON(count > FC_HOST_NUM_ATTRS);
2142
2143 i->host_attrs[count] = NULL;
2144
2145 /*
2146 * Setup Remote Port Attributes.
2147 */
2148 count=0;
2149 SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2150 SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2151 SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2152 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2153 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2154 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2155 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2156 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2157 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2158 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2159
2160 BUG_ON(count > FC_RPORT_NUM_ATTRS);
2161
2162 i->rport_attrs[count] = NULL;
2163
2164 /*
2165 * Setup Virtual Port Attributes.
2166 */
2167 count=0;
2168 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2169 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2170 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2171 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2172 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2173 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2174 SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2175 SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2176 SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2177
2178 BUG_ON(count > FC_VPORT_NUM_ATTRS);
2179
2180 i->vport_attrs[count] = NULL;
2181
2182 return &i->t;
2183 }
2184 EXPORT_SYMBOL(fc_attach_transport);
2185
2186 void fc_release_transport(struct scsi_transport_template *t)
2187 {
2188 struct fc_internal *i = to_fc_internal(t);
2189
2190 transport_container_unregister(&i->t.target_attrs);
2191 transport_container_unregister(&i->t.host_attrs);
2192 transport_container_unregister(&i->rport_attr_cont);
2193 transport_container_unregister(&i->vport_attr_cont);
2194
2195 kfree(i);
2196 }
2197 EXPORT_SYMBOL(fc_release_transport);
2198
2199 /**
2200 * fc_queue_work - Queue work to the fc_host workqueue.
2201 * @shost: Pointer to Scsi_Host bound to fc_host.
2202 * @work: Work to queue for execution.
2203 *
2204 * Return value:
2205 * 1 - work queued for execution
2206 * 0 - work is already queued
2207 * -EINVAL - work queue doesn't exist
2208 */
2209 static int
2210 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2211 {
2212 if (unlikely(!fc_host_work_q(shost))) {
2213 printk(KERN_ERR
2214 "ERROR: FC host '%s' attempted to queue work, "
2215 "when no workqueue created.\n", shost->hostt->name);
2216 dump_stack();
2217
2218 return -EINVAL;
2219 }
2220
2221 return queue_work(fc_host_work_q(shost), work);
2222 }
2223
2224 /**
2225 * fc_flush_work - Flush a fc_host's workqueue.
2226 * @shost: Pointer to Scsi_Host bound to fc_host.
2227 */
2228 static void
2229 fc_flush_work(struct Scsi_Host *shost)
2230 {
2231 if (!fc_host_work_q(shost)) {
2232 printk(KERN_ERR
2233 "ERROR: FC host '%s' attempted to flush work, "
2234 "when no workqueue created.\n", shost->hostt->name);
2235 dump_stack();
2236 return;
2237 }
2238
2239 flush_workqueue(fc_host_work_q(shost));
2240 }
2241
2242 /**
2243 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2244 * @shost: Pointer to Scsi_Host bound to fc_host.
2245 * @work: Work to queue for execution.
2246 * @delay: jiffies to delay the work queuing
2247 *
2248 * Return value:
2249 * 1 on success / 0 already queued / < 0 for error
2250 */
2251 static int
2252 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2253 unsigned long delay)
2254 {
2255 if (unlikely(!fc_host_devloss_work_q(shost))) {
2256 printk(KERN_ERR
2257 "ERROR: FC host '%s' attempted to queue work, "
2258 "when no workqueue created.\n", shost->hostt->name);
2259 dump_stack();
2260
2261 return -EINVAL;
2262 }
2263
2264 return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2265 }
2266
2267 /**
2268 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2269 * @shost: Pointer to Scsi_Host bound to fc_host.
2270 */
2271 static void
2272 fc_flush_devloss(struct Scsi_Host *shost)
2273 {
2274 if (!fc_host_devloss_work_q(shost)) {
2275 printk(KERN_ERR
2276 "ERROR: FC host '%s' attempted to flush work, "
2277 "when no workqueue created.\n", shost->hostt->name);
2278 dump_stack();
2279 return;
2280 }
2281
2282 flush_workqueue(fc_host_devloss_work_q(shost));
2283 }
2284
2285
2286 /**
2287 * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2288 * @shost: Which &Scsi_Host
2289 *
2290 * This routine is expected to be called immediately preceeding the
2291 * a driver's call to scsi_remove_host().
2292 *
2293 * WARNING: A driver utilizing the fc_transport, which fails to call
2294 * this routine prior to scsi_remove_host(), will leave dangling
2295 * objects in /sys/class/fc_remote_ports. Access to any of these
2296 * objects can result in a system crash !!!
2297 *
2298 * Notes:
2299 * This routine assumes no locks are held on entry.
2300 */
2301 void
2302 fc_remove_host(struct Scsi_Host *shost)
2303 {
2304 struct fc_vport *vport = NULL, *next_vport = NULL;
2305 struct fc_rport *rport = NULL, *next_rport = NULL;
2306 struct workqueue_struct *work_q;
2307 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2308 unsigned long flags;
2309
2310 spin_lock_irqsave(shost->host_lock, flags);
2311
2312 /* Remove any vports */
2313 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2314 fc_queue_work(shost, &vport->vport_delete_work);
2315
2316 /* Remove any remote ports */
2317 list_for_each_entry_safe(rport, next_rport,
2318 &fc_host->rports, peers) {
2319 list_del(&rport->peers);
2320 rport->port_state = FC_PORTSTATE_DELETED;
2321 fc_queue_work(shost, &rport->rport_delete_work);
2322 }
2323
2324 list_for_each_entry_safe(rport, next_rport,
2325 &fc_host->rport_bindings, peers) {
2326 list_del(&rport->peers);
2327 rport->port_state = FC_PORTSTATE_DELETED;
2328 fc_queue_work(shost, &rport->rport_delete_work);
2329 }
2330
2331 spin_unlock_irqrestore(shost->host_lock, flags);
2332
2333 /* flush all scan work items */
2334 scsi_flush_work(shost);
2335
2336 /* flush all stgt delete, and rport delete work items, then kill it */
2337 if (fc_host->work_q) {
2338 work_q = fc_host->work_q;
2339 fc_host->work_q = NULL;
2340 destroy_workqueue(work_q);
2341 }
2342
2343 /* flush all devloss work items, then kill it */
2344 if (fc_host->devloss_work_q) {
2345 work_q = fc_host->devloss_work_q;
2346 fc_host->devloss_work_q = NULL;
2347 destroy_workqueue(work_q);
2348 }
2349 }
2350 EXPORT_SYMBOL(fc_remove_host);
2351
2352 static void fc_terminate_rport_io(struct fc_rport *rport)
2353 {
2354 struct Scsi_Host *shost = rport_to_shost(rport);
2355 struct fc_internal *i = to_fc_internal(shost->transportt);
2356
2357 /* Involve the LLDD if possible to terminate all io on the rport. */
2358 if (i->f->terminate_rport_io)
2359 i->f->terminate_rport_io(rport);
2360
2361 /*
2362 * must unblock to flush queued IO. The caller will have set
2363 * the port_state or flags, so that fc_remote_port_chkready will
2364 * fail IO.
2365 */
2366 scsi_target_unblock(&rport->dev);
2367 }
2368
2369 /**
2370 * fc_starget_delete - called to delete the scsi decendents of an rport
2371 * @work: remote port to be operated on.
2372 *
2373 * Deletes target and all sdevs.
2374 */
2375 static void
2376 fc_starget_delete(struct work_struct *work)
2377 {
2378 struct fc_rport *rport =
2379 container_of(work, struct fc_rport, stgt_delete_work);
2380
2381 fc_terminate_rport_io(rport);
2382 scsi_remove_target(&rport->dev);
2383 }
2384
2385
2386 /**
2387 * fc_rport_final_delete - finish rport termination and delete it.
2388 * @work: remote port to be deleted.
2389 */
2390 static void
2391 fc_rport_final_delete(struct work_struct *work)
2392 {
2393 struct fc_rport *rport =
2394 container_of(work, struct fc_rport, rport_delete_work);
2395 struct device *dev = &rport->dev;
2396 struct Scsi_Host *shost = rport_to_shost(rport);
2397 struct fc_internal *i = to_fc_internal(shost->transportt);
2398 unsigned long flags;
2399 int do_callback = 0;
2400
2401 /*
2402 * if a scan is pending, flush the SCSI Host work_q so that
2403 * that we can reclaim the rport scan work element.
2404 */
2405 if (rport->flags & FC_RPORT_SCAN_PENDING)
2406 scsi_flush_work(shost);
2407
2408 fc_terminate_rport_io(rport);
2409
2410 /*
2411 * Cancel any outstanding timers. These should really exist
2412 * only when rmmod'ing the LLDD and we're asking for
2413 * immediate termination of the rports
2414 */
2415 spin_lock_irqsave(shost->host_lock, flags);
2416 if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2417 spin_unlock_irqrestore(shost->host_lock, flags);
2418 if (!cancel_delayed_work(&rport->fail_io_work))
2419 fc_flush_devloss(shost);
2420 if (!cancel_delayed_work(&rport->dev_loss_work))
2421 fc_flush_devloss(shost);
2422 spin_lock_irqsave(shost->host_lock, flags);
2423 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2424 }
2425 spin_unlock_irqrestore(shost->host_lock, flags);
2426
2427 /* Delete SCSI target and sdevs */
2428 if (rport->scsi_target_id != -1)
2429 fc_starget_delete(&rport->stgt_delete_work);
2430
2431 /*
2432 * Notify the driver that the rport is now dead. The LLDD will
2433 * also guarantee that any communication to the rport is terminated
2434 *
2435 * Avoid this call if we already called it when we preserved the
2436 * rport for the binding.
2437 */
2438 spin_lock_irqsave(shost->host_lock, flags);
2439 if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2440 (i->f->dev_loss_tmo_callbk)) {
2441 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2442 do_callback = 1;
2443 }
2444 spin_unlock_irqrestore(shost->host_lock, flags);
2445
2446 if (do_callback)
2447 i->f->dev_loss_tmo_callbk(rport);
2448
2449 fc_bsg_remove(rport->rqst_q);
2450
2451 transport_remove_device(dev);
2452 device_del(dev);
2453 transport_destroy_device(dev);
2454 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2455 put_device(dev); /* for self-reference */
2456 }
2457
2458
2459 /**
2460 * fc_rport_create - allocates and creates a remote FC port.
2461 * @shost: scsi host the remote port is connected to.
2462 * @channel: Channel on shost port connected to.
2463 * @ids: The world wide names, fc address, and FC4 port
2464 * roles for the remote port.
2465 *
2466 * Allocates and creates the remoter port structure, including the
2467 * class and sysfs creation.
2468 *
2469 * Notes:
2470 * This routine assumes no locks are held on entry.
2471 */
2472 static struct fc_rport *
2473 fc_rport_create(struct Scsi_Host *shost, int channel,
2474 struct fc_rport_identifiers *ids)
2475 {
2476 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2477 struct fc_internal *fci = to_fc_internal(shost->transportt);
2478 struct fc_rport *rport;
2479 struct device *dev;
2480 unsigned long flags;
2481 int error;
2482 size_t size;
2483
2484 size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2485 rport = kzalloc(size, GFP_KERNEL);
2486 if (unlikely(!rport)) {
2487 printk(KERN_ERR "%s: allocation failure\n", __func__);
2488 return NULL;
2489 }
2490
2491 rport->maxframe_size = -1;
2492 rport->supported_classes = FC_COS_UNSPECIFIED;
2493 rport->dev_loss_tmo = fc_dev_loss_tmo;
2494 memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2495 memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2496 rport->port_id = ids->port_id;
2497 rport->roles = ids->roles;
2498 rport->port_state = FC_PORTSTATE_ONLINE;
2499 if (fci->f->dd_fcrport_size)
2500 rport->dd_data = &rport[1];
2501 rport->channel = channel;
2502 rport->fast_io_fail_tmo = -1;
2503
2504 INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2505 INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2506 INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2507 INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2508 INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2509
2510 spin_lock_irqsave(shost->host_lock, flags);
2511
2512 rport->number = fc_host->next_rport_number++;
2513 if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2514 rport->scsi_target_id = fc_host->next_target_id++;
2515 else
2516 rport->scsi_target_id = -1;
2517 list_add_tail(&rport->peers, &fc_host->rports);
2518 get_device(&shost->shost_gendev); /* for fc_host->rport list */
2519
2520 spin_unlock_irqrestore(shost->host_lock, flags);
2521
2522 dev = &rport->dev;
2523 device_initialize(dev); /* takes self reference */
2524 dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2525 dev->release = fc_rport_dev_release;
2526 dev_set_name(dev, "rport-%d:%d-%d",
2527 shost->host_no, channel, rport->number);
2528 transport_setup_device(dev);
2529
2530 error = device_add(dev);
2531 if (error) {
2532 printk(KERN_ERR "FC Remote Port device_add failed\n");
2533 goto delete_rport;
2534 }
2535 transport_add_device(dev);
2536 transport_configure_device(dev);
2537
2538 fc_bsg_rportadd(shost, rport);
2539 /* ignore any bsg add error - we just can't do sgio */
2540
2541 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2542 /* initiate a scan of the target */
2543 rport->flags |= FC_RPORT_SCAN_PENDING;
2544 scsi_queue_work(shost, &rport->scan_work);
2545 }
2546
2547 return rport;
2548
2549 delete_rport:
2550 transport_destroy_device(dev);
2551 spin_lock_irqsave(shost->host_lock, flags);
2552 list_del(&rport->peers);
2553 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2554 spin_unlock_irqrestore(shost->host_lock, flags);
2555 put_device(dev->parent);
2556 kfree(rport);
2557 return NULL;
2558 }
2559
2560 /**
2561 * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2562 * @shost: scsi host the remote port is connected to.
2563 * @channel: Channel on shost port connected to.
2564 * @ids: The world wide names, fc address, and FC4 port
2565 * roles for the remote port.
2566 *
2567 * The LLDD calls this routine to notify the transport of the existence
2568 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2569 * of the port, it's FC address (port_id), and the FC4 roles that are
2570 * active for the port.
2571 *
2572 * For ports that are FCP targets (aka scsi targets), the FC transport
2573 * maintains consistent target id bindings on behalf of the LLDD.
2574 * A consistent target id binding is an assignment of a target id to
2575 * a remote port identifier, which persists while the scsi host is
2576 * attached. The remote port can disappear, then later reappear, and
2577 * it's target id assignment remains the same. This allows for shifts
2578 * in FC addressing (if binding by wwpn or wwnn) with no apparent
2579 * changes to the scsi subsystem which is based on scsi host number and
2580 * target id values. Bindings are only valid during the attachment of
2581 * the scsi host. If the host detaches, then later re-attaches, target
2582 * id bindings may change.
2583 *
2584 * This routine is responsible for returning a remote port structure.
2585 * The routine will search the list of remote ports it maintains
2586 * internally on behalf of consistent target id mappings. If found, the
2587 * remote port structure will be reused. Otherwise, a new remote port
2588 * structure will be allocated.
2589 *
2590 * Whenever a remote port is allocated, a new fc_remote_port class
2591 * device is created.
2592 *
2593 * Should not be called from interrupt context.
2594 *
2595 * Notes:
2596 * This routine assumes no locks are held on entry.
2597 */
2598 struct fc_rport *
2599 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2600 struct fc_rport_identifiers *ids)
2601 {
2602 struct fc_internal *fci = to_fc_internal(shost->transportt);
2603 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2604 struct fc_rport *rport;
2605 unsigned long flags;
2606 int match = 0;
2607
2608 /* ensure any stgt delete functions are done */
2609 fc_flush_work(shost);
2610
2611 /*
2612 * Search the list of "active" rports, for an rport that has been
2613 * deleted, but we've held off the real delete while the target
2614 * is in a "blocked" state.
2615 */
2616 spin_lock_irqsave(shost->host_lock, flags);
2617
2618 list_for_each_entry(rport, &fc_host->rports, peers) {
2619
2620 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2621 (rport->channel == channel)) {
2622
2623 switch (fc_host->tgtid_bind_type) {
2624 case FC_TGTID_BIND_BY_WWPN:
2625 case FC_TGTID_BIND_NONE:
2626 if (rport->port_name == ids->port_name)
2627 match = 1;
2628 break;
2629 case FC_TGTID_BIND_BY_WWNN:
2630 if (rport->node_name == ids->node_name)
2631 match = 1;
2632 break;
2633 case FC_TGTID_BIND_BY_ID:
2634 if (rport->port_id == ids->port_id)
2635 match = 1;
2636 break;
2637 }
2638
2639 if (match) {
2640
2641 memcpy(&rport->node_name, &ids->node_name,
2642 sizeof(rport->node_name));
2643 memcpy(&rport->port_name, &ids->port_name,
2644 sizeof(rport->port_name));
2645 rport->port_id = ids->port_id;
2646
2647 rport->port_state = FC_PORTSTATE_ONLINE;
2648 rport->roles = ids->roles;
2649
2650 spin_unlock_irqrestore(shost->host_lock, flags);
2651
2652 if (fci->f->dd_fcrport_size)
2653 memset(rport->dd_data, 0,
2654 fci->f->dd_fcrport_size);
2655
2656 /*
2657 * If we were not a target, cancel the
2658 * io terminate and rport timers, and
2659 * we're done.
2660 *
2661 * If we were a target, but our new role
2662 * doesn't indicate a target, leave the
2663 * timers running expecting the role to
2664 * change as the target fully logs in. If
2665 * it doesn't, the target will be torn down.
2666 *
2667 * If we were a target, and our role shows
2668 * we're still a target, cancel the timers
2669 * and kick off a scan.
2670 */
2671
2672 /* was a target, not in roles */
2673 if ((rport->scsi_target_id != -1) &&
2674 (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2675 return rport;
2676
2677 /*
2678 * Stop the fail io and dev_loss timers.
2679 * If they flush, the port_state will
2680 * be checked and will NOOP the function.
2681 */
2682 if (!cancel_delayed_work(&rport->fail_io_work))
2683 fc_flush_devloss(shost);
2684 if (!cancel_delayed_work(&rport->dev_loss_work))
2685 fc_flush_devloss(shost);
2686
2687 spin_lock_irqsave(shost->host_lock, flags);
2688
2689 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2690 FC_RPORT_DEVLOSS_PENDING |
2691 FC_RPORT_DEVLOSS_CALLBK_DONE);
2692
2693 /* if target, initiate a scan */
2694 if (rport->scsi_target_id != -1) {
2695 rport->flags |= FC_RPORT_SCAN_PENDING;
2696 scsi_queue_work(shost,
2697 &rport->scan_work);
2698 spin_unlock_irqrestore(shost->host_lock,
2699 flags);
2700 scsi_target_unblock(&rport->dev);
2701 } else
2702 spin_unlock_irqrestore(shost->host_lock,
2703 flags);
2704
2705 fc_bsg_goose_queue(rport);
2706
2707 return rport;
2708 }
2709 }
2710 }
2711
2712 /*
2713 * Search the bindings array
2714 * Note: if never a FCP target, you won't be on this list
2715 */
2716 if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2717
2718 /* search for a matching consistent binding */
2719
2720 list_for_each_entry(rport, &fc_host->rport_bindings,
2721 peers) {
2722 if (rport->channel != channel)
2723 continue;
2724
2725 switch (fc_host->tgtid_bind_type) {
2726 case FC_TGTID_BIND_BY_WWPN:
2727 if (rport->port_name == ids->port_name)
2728 match = 1;
2729 break;
2730 case FC_TGTID_BIND_BY_WWNN:
2731 if (rport->node_name == ids->node_name)
2732 match = 1;
2733 break;
2734 case FC_TGTID_BIND_BY_ID:
2735 if (rport->port_id == ids->port_id)
2736 match = 1;
2737 break;
2738 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2739 break;
2740 }
2741
2742 if (match) {
2743 list_move_tail(&rport->peers, &fc_host->rports);
2744 break;
2745 }
2746 }
2747
2748 if (match) {
2749 memcpy(&rport->node_name, &ids->node_name,
2750 sizeof(rport->node_name));
2751 memcpy(&rport->port_name, &ids->port_name,
2752 sizeof(rport->port_name));
2753 rport->port_id = ids->port_id;
2754 rport->roles = ids->roles;
2755 rport->port_state = FC_PORTSTATE_ONLINE;
2756 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2757
2758 if (fci->f->dd_fcrport_size)
2759 memset(rport->dd_data, 0,
2760 fci->f->dd_fcrport_size);
2761
2762 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2763 /* initiate a scan of the target */
2764 rport->flags |= FC_RPORT_SCAN_PENDING;
2765 scsi_queue_work(shost, &rport->scan_work);
2766 spin_unlock_irqrestore(shost->host_lock, flags);
2767 scsi_target_unblock(&rport->dev);
2768 } else
2769 spin_unlock_irqrestore(shost->host_lock, flags);
2770
2771 return rport;
2772 }
2773 }
2774
2775 spin_unlock_irqrestore(shost->host_lock, flags);
2776
2777 /* No consistent binding found - create new remote port entry */
2778 rport = fc_rport_create(shost, channel, ids);
2779
2780 return rport;
2781 }
2782 EXPORT_SYMBOL(fc_remote_port_add);
2783
2784
2785 /**
2786 * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2787 * @rport: The remote port that no longer exists
2788 *
2789 * The LLDD calls this routine to notify the transport that a remote
2790 * port is no longer part of the topology. Note: Although a port
2791 * may no longer be part of the topology, it may persist in the remote
2792 * ports displayed by the fc_host. We do this under 2 conditions:
2793 * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2794 * This allows the port to temporarily disappear, then reappear without
2795 * disrupting the SCSI device tree attached to it. During the "blocked"
2796 * period the port will still exist.
2797 * 2) If the port was a scsi target and disappears for longer than we
2798 * expect, we'll delete the port and the tear down the SCSI device tree
2799 * attached to it. However, we want to semi-persist the target id assigned
2800 * to that port if it eventually does exist. The port structure will
2801 * remain (although with minimal information) so that the target id
2802 * bindings remails.
2803 *
2804 * If the remote port is not an FCP Target, it will be fully torn down
2805 * and deallocated, including the fc_remote_port class device.
2806 *
2807 * If the remote port is an FCP Target, the port will be placed in a
2808 * temporary blocked state. From the LLDD's perspective, the rport no
2809 * longer exists. From the SCSI midlayer's perspective, the SCSI target
2810 * exists, but all sdevs on it are blocked from further I/O. The following
2811 * is then expected.
2812 *
2813 * If the remote port does not return (signaled by a LLDD call to
2814 * fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2815 * scsi target is removed - killing all outstanding i/o and removing the
2816 * scsi devices attached ot it. The port structure will be marked Not
2817 * Present and be partially cleared, leaving only enough information to
2818 * recognize the remote port relative to the scsi target id binding if
2819 * it later appears. The port will remain as long as there is a valid
2820 * binding (e.g. until the user changes the binding type or unloads the
2821 * scsi host with the binding).
2822 *
2823 * If the remote port returns within the dev_loss_tmo value (and matches
2824 * according to the target id binding type), the port structure will be
2825 * reused. If it is no longer a SCSI target, the target will be torn
2826 * down. If it continues to be a SCSI target, then the target will be
2827 * unblocked (allowing i/o to be resumed), and a scan will be activated
2828 * to ensure that all luns are detected.
2829 *
2830 * Called from normal process context only - cannot be called from interrupt.
2831 *
2832 * Notes:
2833 * This routine assumes no locks are held on entry.
2834 */
2835 void
2836 fc_remote_port_delete(struct fc_rport *rport)
2837 {
2838 struct Scsi_Host *shost = rport_to_shost(rport);
2839 int timeout = rport->dev_loss_tmo;
2840 unsigned long flags;
2841
2842 /*
2843 * No need to flush the fc_host work_q's, as all adds are synchronous.
2844 *
2845 * We do need to reclaim the rport scan work element, so eventually
2846 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2847 * there's still a scan pending.
2848 */
2849
2850 spin_lock_irqsave(shost->host_lock, flags);
2851
2852 if (rport->port_state != FC_PORTSTATE_ONLINE) {
2853 spin_unlock_irqrestore(shost->host_lock, flags);
2854 return;
2855 }
2856
2857 /*
2858 * In the past, we if this was not an FCP-Target, we would
2859 * unconditionally just jump to deleting the rport.
2860 * However, rports can be used as node containers by the LLDD,
2861 * and its not appropriate to just terminate the rport at the
2862 * first sign of a loss in connectivity. The LLDD may want to
2863 * send ELS traffic to re-validate the login. If the rport is
2864 * immediately deleted, it makes it inappropriate for a node
2865 * container.
2866 * So... we now unconditionally wait dev_loss_tmo before
2867 * destroying an rport.
2868 */
2869
2870 rport->port_state = FC_PORTSTATE_BLOCKED;
2871
2872 rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2873
2874 spin_unlock_irqrestore(shost->host_lock, flags);
2875
2876 if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2877 shost->active_mode & MODE_TARGET)
2878 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2879
2880 scsi_target_block(&rport->dev);
2881
2882 /* see if we need to kill io faster than waiting for device loss */
2883 if ((rport->fast_io_fail_tmo != -1) &&
2884 (rport->fast_io_fail_tmo < timeout))
2885 fc_queue_devloss_work(shost, &rport->fail_io_work,
2886 rport->fast_io_fail_tmo * HZ);
2887
2888 /* cap the length the devices can be blocked until they are deleted */
2889 fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2890 }
2891 EXPORT_SYMBOL(fc_remote_port_delete);
2892
2893 /**
2894 * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
2895 * @rport: The remote port that changed.
2896 * @roles: New roles for this port.
2897 *
2898 * Description: The LLDD calls this routine to notify the transport that the
2899 * roles on a remote port may have changed. The largest effect of this is
2900 * if a port now becomes a FCP Target, it must be allocated a
2901 * scsi target id. If the port is no longer a FCP target, any
2902 * scsi target id value assigned to it will persist in case the
2903 * role changes back to include FCP Target. No changes in the scsi
2904 * midlayer will be invoked if the role changes (in the expectation
2905 * that the role will be resumed. If it doesn't normal error processing
2906 * will take place).
2907 *
2908 * Should not be called from interrupt context.
2909 *
2910 * Notes:
2911 * This routine assumes no locks are held on entry.
2912 */
2913 void
2914 fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
2915 {
2916 struct Scsi_Host *shost = rport_to_shost(rport);
2917 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2918 unsigned long flags;
2919 int create = 0;
2920 int ret;
2921
2922 spin_lock_irqsave(shost->host_lock, flags);
2923 if (roles & FC_PORT_ROLE_FCP_TARGET) {
2924 if (rport->scsi_target_id == -1) {
2925 rport->scsi_target_id = fc_host->next_target_id++;
2926 create = 1;
2927 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
2928 create = 1;
2929 } else if (shost->active_mode & MODE_TARGET) {
2930 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
2931 (char *)&rport->node_name);
2932 if (ret)
2933 printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
2934 ret);
2935 }
2936
2937 rport->roles = roles;
2938
2939 spin_unlock_irqrestore(shost->host_lock, flags);
2940
2941 if (create) {
2942 /*
2943 * There may have been a delete timer running on the
2944 * port. Ensure that it is cancelled as we now know
2945 * the port is an FCP Target.
2946 * Note: we know the rport is exists and in an online
2947 * state as the LLDD would not have had an rport
2948 * reference to pass us.
2949 *
2950 * Take no action on the del_timer failure as the state
2951 * machine state change will validate the
2952 * transaction.
2953 */
2954 if (!cancel_delayed_work(&rport->fail_io_work))
2955 fc_flush_devloss(shost);
2956 if (!cancel_delayed_work(&rport->dev_loss_work))
2957 fc_flush_devloss(shost);
2958
2959 spin_lock_irqsave(shost->host_lock, flags);
2960 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2961 FC_RPORT_DEVLOSS_PENDING);
2962 spin_unlock_irqrestore(shost->host_lock, flags);
2963
2964 /* ensure any stgt delete functions are done */
2965 fc_flush_work(shost);
2966
2967 /* initiate a scan of the target */
2968 spin_lock_irqsave(shost->host_lock, flags);
2969 rport->flags |= FC_RPORT_SCAN_PENDING;
2970 scsi_queue_work(shost, &rport->scan_work);
2971 spin_unlock_irqrestore(shost->host_lock, flags);
2972 scsi_target_unblock(&rport->dev);
2973 }
2974 }
2975 EXPORT_SYMBOL(fc_remote_port_rolechg);
2976
2977 /**
2978 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
2979 * @work: rport target that failed to reappear in the allotted time.
2980 *
2981 * Description: An attempt to delete a remote port blocks, and if it fails
2982 * to return in the allotted time this gets called.
2983 */
2984 static void
2985 fc_timeout_deleted_rport(struct work_struct *work)
2986 {
2987 struct fc_rport *rport =
2988 container_of(work, struct fc_rport, dev_loss_work.work);
2989 struct Scsi_Host *shost = rport_to_shost(rport);
2990 struct fc_internal *i = to_fc_internal(shost->transportt);
2991 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2992 unsigned long flags;
2993 int do_callback = 0;
2994
2995 spin_lock_irqsave(shost->host_lock, flags);
2996
2997 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2998
2999 /*
3000 * If the port is ONLINE, then it came back. If it was a SCSI
3001 * target, validate it still is. If not, tear down the
3002 * scsi_target on it.
3003 */
3004 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3005 (rport->scsi_target_id != -1) &&
3006 !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3007 dev_printk(KERN_ERR, &rport->dev,
3008 "blocked FC remote port time out: no longer"
3009 " a FCP target, removing starget\n");
3010 spin_unlock_irqrestore(shost->host_lock, flags);
3011 scsi_target_unblock(&rport->dev);
3012 fc_queue_work(shost, &rport->stgt_delete_work);
3013 return;
3014 }
3015
3016 /* NOOP state - we're flushing workq's */
3017 if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3018 spin_unlock_irqrestore(shost->host_lock, flags);
3019 dev_printk(KERN_ERR, &rport->dev,
3020 "blocked FC remote port time out: leaving"
3021 " rport%s alone\n",
3022 (rport->scsi_target_id != -1) ? " and starget" : "");
3023 return;
3024 }
3025
3026 if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3027 (rport->scsi_target_id == -1)) {
3028 list_del(&rport->peers);
3029 rport->port_state = FC_PORTSTATE_DELETED;
3030 dev_printk(KERN_ERR, &rport->dev,
3031 "blocked FC remote port time out: removing"
3032 " rport%s\n",
3033 (rport->scsi_target_id != -1) ? " and starget" : "");
3034 fc_queue_work(shost, &rport->rport_delete_work);
3035 spin_unlock_irqrestore(shost->host_lock, flags);
3036 return;
3037 }
3038
3039 dev_printk(KERN_ERR, &rport->dev,
3040 "blocked FC remote port time out: removing target and "
3041 "saving binding\n");
3042
3043 list_move_tail(&rport->peers, &fc_host->rport_bindings);
3044
3045 /*
3046 * Note: We do not remove or clear the hostdata area. This allows
3047 * host-specific target data to persist along with the
3048 * scsi_target_id. It's up to the host to manage it's hostdata area.
3049 */
3050
3051 /*
3052 * Reinitialize port attributes that may change if the port comes back.
3053 */
3054 rport->maxframe_size = -1;
3055 rport->supported_classes = FC_COS_UNSPECIFIED;
3056 rport->roles = FC_PORT_ROLE_UNKNOWN;
3057 rport->port_state = FC_PORTSTATE_NOTPRESENT;
3058 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3059
3060 /*
3061 * Pre-emptively kill I/O rather than waiting for the work queue
3062 * item to teardown the starget. (FCOE libFC folks prefer this
3063 * and to have the rport_port_id still set when it's done).
3064 */
3065 spin_unlock_irqrestore(shost->host_lock, flags);
3066 fc_terminate_rport_io(rport);
3067
3068 spin_lock_irqsave(shost->host_lock, flags);
3069
3070 if (rport->port_state == FC_PORTSTATE_NOTPRESENT) { /* still missing */
3071
3072 /* remove the identifiers that aren't used in the consisting binding */
3073 switch (fc_host->tgtid_bind_type) {
3074 case FC_TGTID_BIND_BY_WWPN:
3075 rport->node_name = -1;
3076 rport->port_id = -1;
3077 break;
3078 case FC_TGTID_BIND_BY_WWNN:
3079 rport->port_name = -1;
3080 rport->port_id = -1;
3081 break;
3082 case FC_TGTID_BIND_BY_ID:
3083 rport->node_name = -1;
3084 rport->port_name = -1;
3085 break;
3086 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3087 break;
3088 }
3089
3090 /*
3091 * As this only occurs if the remote port (scsi target)
3092 * went away and didn't come back - we'll remove
3093 * all attached scsi devices.
3094 */
3095 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3096 fc_queue_work(shost, &rport->stgt_delete_work);
3097
3098 do_callback = 1;
3099 }
3100
3101 spin_unlock_irqrestore(shost->host_lock, flags);
3102
3103 /*
3104 * Notify the driver that the rport is now dead. The LLDD will
3105 * also guarantee that any communication to the rport is terminated
3106 *
3107 * Note: we set the CALLBK_DONE flag above to correspond
3108 */
3109 if (do_callback && i->f->dev_loss_tmo_callbk)
3110 i->f->dev_loss_tmo_callbk(rport);
3111 }
3112
3113
3114 /**
3115 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3116 * @work: rport to terminate io on.
3117 *
3118 * Notes: Only requests the failure of the io, not that all are flushed
3119 * prior to returning.
3120 */
3121 static void
3122 fc_timeout_fail_rport_io(struct work_struct *work)
3123 {
3124 struct fc_rport *rport =
3125 container_of(work, struct fc_rport, fail_io_work.work);
3126
3127 if (rport->port_state != FC_PORTSTATE_BLOCKED)
3128 return;
3129
3130 rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3131 fc_terminate_rport_io(rport);
3132 }
3133
3134 /**
3135 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3136 * @work: remote port to be scanned.
3137 */
3138 static void
3139 fc_scsi_scan_rport(struct work_struct *work)
3140 {
3141 struct fc_rport *rport =
3142 container_of(work, struct fc_rport, scan_work);
3143 struct Scsi_Host *shost = rport_to_shost(rport);
3144 struct fc_internal *i = to_fc_internal(shost->transportt);
3145 unsigned long flags;
3146
3147 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3148 (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3149 !(i->f->disable_target_scan)) {
3150 scsi_scan_target(&rport->dev, rport->channel,
3151 rport->scsi_target_id, SCAN_WILD_CARD, 1);
3152 }
3153
3154 spin_lock_irqsave(shost->host_lock, flags);
3155 rport->flags &= ~FC_RPORT_SCAN_PENDING;
3156 spin_unlock_irqrestore(shost->host_lock, flags);
3157 }
3158
3159 /**
3160 * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3161 * @cmnd: SCSI command that scsi_eh is trying to recover
3162 *
3163 * This routine can be called from a FC LLD scsi_eh callback. It
3164 * blocks the scsi_eh thread until the fc_rport leaves the
3165 * FC_PORTSTATE_BLOCKED. This is necessary to avoid the scsi_eh
3166 * failing recovery actions for blocked rports which would lead to
3167 * offlined SCSI devices.
3168 */
3169 void fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3170 {
3171 struct Scsi_Host *shost = cmnd->device->host;
3172 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3173 unsigned long flags;
3174
3175 spin_lock_irqsave(shost->host_lock, flags);
3176 while (rport->port_state == FC_PORTSTATE_BLOCKED) {
3177 spin_unlock_irqrestore(shost->host_lock, flags);
3178 msleep(1000);
3179 spin_lock_irqsave(shost->host_lock, flags);
3180 }
3181 spin_unlock_irqrestore(shost->host_lock, flags);
3182 }
3183 EXPORT_SYMBOL(fc_block_scsi_eh);
3184
3185 /**
3186 * fc_vport_setup - allocates and creates a FC virtual port.
3187 * @shost: scsi host the virtual port is connected to.
3188 * @channel: Channel on shost port connected to.
3189 * @pdev: parent device for vport
3190 * @ids: The world wide names, FC4 port roles, etc for
3191 * the virtual port.
3192 * @ret_vport: The pointer to the created vport.
3193 *
3194 * Allocates and creates the vport structure, calls the parent host
3195 * to instantiate the vport, the completes w/ class and sysfs creation.
3196 *
3197 * Notes:
3198 * This routine assumes no locks are held on entry.
3199 */
3200 static int
3201 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3202 struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
3203 {
3204 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3205 struct fc_internal *fci = to_fc_internal(shost->transportt);
3206 struct fc_vport *vport;
3207 struct device *dev;
3208 unsigned long flags;
3209 size_t size;
3210 int error;
3211
3212 *ret_vport = NULL;
3213
3214 if ( ! fci->f->vport_create)
3215 return -ENOENT;
3216
3217 size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3218 vport = kzalloc(size, GFP_KERNEL);
3219 if (unlikely(!vport)) {
3220 printk(KERN_ERR "%s: allocation failure\n", __func__);
3221 return -ENOMEM;
3222 }
3223
3224 vport->vport_state = FC_VPORT_UNKNOWN;
3225 vport->vport_last_state = FC_VPORT_UNKNOWN;
3226 vport->node_name = ids->node_name;
3227 vport->port_name = ids->port_name;
3228 vport->roles = ids->roles;
3229 vport->vport_type = ids->vport_type;
3230 if (fci->f->dd_fcvport_size)
3231 vport->dd_data = &vport[1];
3232 vport->shost = shost;
3233 vport->channel = channel;
3234 vport->flags = FC_VPORT_CREATING;
3235 INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3236
3237 spin_lock_irqsave(shost->host_lock, flags);
3238
3239 if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3240 spin_unlock_irqrestore(shost->host_lock, flags);
3241 kfree(vport);
3242 return -ENOSPC;
3243 }
3244 fc_host->npiv_vports_inuse++;
3245 vport->number = fc_host->next_vport_number++;
3246 list_add_tail(&vport->peers, &fc_host->vports);
3247 get_device(&shost->shost_gendev); /* for fc_host->vport list */
3248
3249 spin_unlock_irqrestore(shost->host_lock, flags);
3250
3251 dev = &vport->dev;
3252 device_initialize(dev); /* takes self reference */
3253 dev->parent = get_device(pdev); /* takes parent reference */
3254 dev->release = fc_vport_dev_release;
3255 dev_set_name(dev, "vport-%d:%d-%d",
3256 shost->host_no, channel, vport->number);
3257 transport_setup_device(dev);
3258
3259 error = device_add(dev);
3260 if (error) {
3261 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3262 goto delete_vport;
3263 }
3264 transport_add_device(dev);
3265 transport_configure_device(dev);
3266
3267 error = fci->f->vport_create(vport, ids->disable);
3268 if (error) {
3269 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3270 goto delete_vport_all;
3271 }
3272
3273 /*
3274 * if the parent isn't the physical adapter's Scsi_Host, ensure
3275 * the Scsi_Host at least contains ia symlink to the vport.
3276 */
3277 if (pdev != &shost->shost_gendev) {
3278 error = sysfs_create_link(&shost->shost_gendev.kobj,
3279 &dev->kobj, dev_name(dev));
3280 if (error)
3281 printk(KERN_ERR
3282 "%s: Cannot create vport symlinks for "
3283 "%s, err=%d\n",
3284 __func__, dev_name(dev), error);
3285 }
3286 spin_lock_irqsave(shost->host_lock, flags);
3287 vport->flags &= ~FC_VPORT_CREATING;
3288 spin_unlock_irqrestore(shost->host_lock, flags);
3289
3290 dev_printk(KERN_NOTICE, pdev,
3291 "%s created via shost%d channel %d\n", dev_name(dev),
3292 shost->host_no, channel);
3293
3294 *ret_vport = vport;
3295
3296 return 0;
3297
3298 delete_vport_all:
3299 transport_remove_device(dev);
3300 device_del(dev);
3301 delete_vport:
3302 transport_destroy_device(dev);
3303 spin_lock_irqsave(shost->host_lock, flags);
3304 list_del(&vport->peers);
3305 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3306 fc_host->npiv_vports_inuse--;
3307 spin_unlock_irqrestore(shost->host_lock, flags);
3308 put_device(dev->parent);
3309 kfree(vport);
3310
3311 return error;
3312 }
3313
3314 /**
3315 * fc_vport_create - Admin App or LLDD requests creation of a vport
3316 * @shost: scsi host the virtual port is connected to.
3317 * @channel: channel on shost port connected to.
3318 * @ids: The world wide names, FC4 port roles, etc for
3319 * the virtual port.
3320 *
3321 * Notes:
3322 * This routine assumes no locks are held on entry.
3323 */
3324 struct fc_vport *
3325 fc_vport_create(struct Scsi_Host *shost, int channel,
3326 struct fc_vport_identifiers *ids)
3327 {
3328 int stat;
3329 struct fc_vport *vport;
3330
3331 stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3332 ids, &vport);
3333 return stat ? NULL : vport;
3334 }
3335 EXPORT_SYMBOL(fc_vport_create);
3336
3337 /**
3338 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3339 * @vport: fc_vport to be terminated
3340 *
3341 * Calls the LLDD vport_delete() function, then deallocates and removes
3342 * the vport from the shost and object tree.
3343 *
3344 * Notes:
3345 * This routine assumes no locks are held on entry.
3346 */
3347 int
3348 fc_vport_terminate(struct fc_vport *vport)
3349 {
3350 struct Scsi_Host *shost = vport_to_shost(vport);
3351 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3352 struct fc_internal *i = to_fc_internal(shost->transportt);
3353 struct device *dev = &vport->dev;
3354 unsigned long flags;
3355 int stat;
3356
3357 spin_lock_irqsave(shost->host_lock, flags);
3358 if (vport->flags & FC_VPORT_CREATING) {
3359 spin_unlock_irqrestore(shost->host_lock, flags);
3360 return -EBUSY;
3361 }
3362 if (vport->flags & (FC_VPORT_DEL)) {
3363 spin_unlock_irqrestore(shost->host_lock, flags);
3364 return -EALREADY;
3365 }
3366 vport->flags |= FC_VPORT_DELETING;
3367 spin_unlock_irqrestore(shost->host_lock, flags);
3368
3369 if (i->f->vport_delete)
3370 stat = i->f->vport_delete(vport);
3371 else
3372 stat = -ENOENT;
3373
3374 spin_lock_irqsave(shost->host_lock, flags);
3375 vport->flags &= ~FC_VPORT_DELETING;
3376 if (!stat) {
3377 vport->flags |= FC_VPORT_DELETED;
3378 list_del(&vport->peers);
3379 fc_host->npiv_vports_inuse--;
3380 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3381 }
3382 spin_unlock_irqrestore(shost->host_lock, flags);
3383
3384 if (stat)
3385 return stat;
3386
3387 if (dev->parent != &shost->shost_gendev)
3388 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3389 transport_remove_device(dev);
3390 device_del(dev);
3391 transport_destroy_device(dev);
3392
3393 /*
3394 * Removing our self-reference should mean our
3395 * release function gets called, which will drop the remaining
3396 * parent reference and free the data structure.
3397 */
3398 put_device(dev); /* for self-reference */
3399
3400 return 0; /* SUCCESS */
3401 }
3402 EXPORT_SYMBOL(fc_vport_terminate);
3403
3404 /**
3405 * fc_vport_sched_delete - workq-based delete request for a vport
3406 * @work: vport to be deleted.
3407 */
3408 static void
3409 fc_vport_sched_delete(struct work_struct *work)
3410 {
3411 struct fc_vport *vport =
3412 container_of(work, struct fc_vport, vport_delete_work);
3413 int stat;
3414
3415 stat = fc_vport_terminate(vport);
3416 if (stat)
3417 dev_printk(KERN_ERR, vport->dev.parent,
3418 "%s: %s could not be deleted created via "
3419 "shost%d channel %d - error %d\n", __func__,
3420 dev_name(&vport->dev), vport->shost->host_no,
3421 vport->channel, stat);
3422 }
3423
3424
3425 /*
3426 * BSG support
3427 */
3428
3429
3430 /**
3431 * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3432 * @job: fc_bsg_job that is to be torn down
3433 */
3434 static void
3435 fc_destroy_bsgjob(struct fc_bsg_job *job)
3436 {
3437 unsigned long flags;
3438
3439 spin_lock_irqsave(&job->job_lock, flags);
3440 if (job->ref_cnt) {
3441 spin_unlock_irqrestore(&job->job_lock, flags);
3442 return;
3443 }
3444 spin_unlock_irqrestore(&job->job_lock, flags);
3445
3446 put_device(job->dev); /* release reference for the request */
3447
3448 kfree(job->request_payload.sg_list);
3449 kfree(job->reply_payload.sg_list);
3450 kfree(job);
3451 }
3452
3453 /**
3454 * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3455 * completed
3456 * @job: fc_bsg_job that is complete
3457 */
3458 static void
3459 fc_bsg_jobdone(struct fc_bsg_job *job)
3460 {
3461 struct request *req = job->req;
3462 struct request *rsp = req->next_rq;
3463 int err;
3464
3465 err = job->req->errors = job->reply->result;
3466
3467 if (err < 0)
3468 /* we're only returning the result field in the reply */
3469 job->req->sense_len = sizeof(uint32_t);
3470 else
3471 job->req->sense_len = job->reply_len;
3472
3473 /* we assume all request payload was transferred, residual == 0 */
3474 req->resid_len = 0;
3475
3476 if (rsp) {
3477 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3478
3479 /* set reply (bidi) residual */
3480 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3481 rsp->resid_len);
3482 }
3483 blk_complete_request(req);
3484 }
3485
3486 /**
3487 * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3488 * @rq: BSG request that holds the job to be destroyed
3489 */
3490 static void fc_bsg_softirq_done(struct request *rq)
3491 {
3492 struct fc_bsg_job *job = rq->special;
3493 unsigned long flags;
3494
3495 spin_lock_irqsave(&job->job_lock, flags);
3496 job->state_flags |= FC_RQST_STATE_DONE;
3497 job->ref_cnt--;
3498 spin_unlock_irqrestore(&job->job_lock, flags);
3499
3500 blk_end_request_all(rq, rq->errors);
3501 fc_destroy_bsgjob(job);
3502 }
3503
3504 /**
3505 * fc_bsg_job_timeout - handler for when a bsg request timesout
3506 * @req: request that timed out
3507 */
3508 static enum blk_eh_timer_return
3509 fc_bsg_job_timeout(struct request *req)
3510 {
3511 struct fc_bsg_job *job = (void *) req->special;
3512 struct Scsi_Host *shost = job->shost;
3513 struct fc_internal *i = to_fc_internal(shost->transportt);
3514 unsigned long flags;
3515 int err = 0, done = 0;
3516
3517 if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3518 return BLK_EH_RESET_TIMER;
3519
3520 spin_lock_irqsave(&job->job_lock, flags);
3521 if (job->state_flags & FC_RQST_STATE_DONE)
3522 done = 1;
3523 else
3524 job->ref_cnt++;
3525 spin_unlock_irqrestore(&job->job_lock, flags);
3526
3527 if (!done && i->f->bsg_timeout) {
3528 /* call LLDD to abort the i/o as it has timed out */
3529 err = i->f->bsg_timeout(job);
3530 if (err == -EAGAIN) {
3531 job->ref_cnt--;
3532 return BLK_EH_RESET_TIMER;
3533 } else if (err)
3534 printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3535 "abort failed with status %d\n", err);
3536 }
3537
3538 /* the blk_end_sync_io() doesn't check the error */
3539 if (done)
3540 return BLK_EH_NOT_HANDLED;
3541 else
3542 return BLK_EH_HANDLED;
3543 }
3544
3545 static int
3546 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3547 {
3548 size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3549
3550 BUG_ON(!req->nr_phys_segments);
3551
3552 buf->sg_list = kzalloc(sz, GFP_KERNEL);
3553 if (!buf->sg_list)
3554 return -ENOMEM;
3555 sg_init_table(buf->sg_list, req->nr_phys_segments);
3556 buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3557 buf->payload_len = blk_rq_bytes(req);
3558 return 0;
3559 }
3560
3561
3562 /**
3563 * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3564 * bsg request
3565 * @shost: SCSI Host corresponding to the bsg object
3566 * @rport: (optional) FC Remote Port corresponding to the bsg object
3567 * @req: BSG request that needs a job structure
3568 */
3569 static int
3570 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3571 struct request *req)
3572 {
3573 struct fc_internal *i = to_fc_internal(shost->transportt);
3574 struct request *rsp = req->next_rq;
3575 struct fc_bsg_job *job;
3576 int ret;
3577
3578 BUG_ON(req->special);
3579
3580 job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3581 GFP_KERNEL);
3582 if (!job)
3583 return -ENOMEM;
3584
3585 /*
3586 * Note: this is a bit silly.
3587 * The request gets formatted as a SGIO v4 ioctl request, which
3588 * then gets reformatted as a blk request, which then gets
3589 * reformatted as a fc bsg request. And on completion, we have
3590 * to wrap return results such that SGIO v4 thinks it was a scsi
3591 * status. I hope this was all worth it.
3592 */
3593
3594 req->special = job;
3595 job->shost = shost;
3596 job->rport = rport;
3597 job->req = req;
3598 if (i->f->dd_bsg_size)
3599 job->dd_data = (void *)&job[1];
3600 spin_lock_init(&job->job_lock);
3601 job->request = (struct fc_bsg_request *)req->cmd;
3602 job->request_len = req->cmd_len;
3603 job->reply = req->sense;
3604 job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3605 * allocated */
3606 if (req->bio) {
3607 ret = fc_bsg_map_buffer(&job->request_payload, req);
3608 if (ret)
3609 goto failjob_rls_job;
3610 }
3611 if (rsp && rsp->bio) {
3612 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3613 if (ret)
3614 goto failjob_rls_rqst_payload;
3615 }
3616 job->job_done = fc_bsg_jobdone;
3617 if (rport)
3618 job->dev = &rport->dev;
3619 else
3620 job->dev = &shost->shost_gendev;
3621 get_device(job->dev); /* take a reference for the request */
3622
3623 job->ref_cnt = 1;
3624
3625 return 0;
3626
3627
3628 failjob_rls_rqst_payload:
3629 kfree(job->request_payload.sg_list);
3630 failjob_rls_job:
3631 kfree(job);
3632 return -ENOMEM;
3633 }
3634
3635
3636 enum fc_dispatch_result {
3637 FC_DISPATCH_BREAK, /* on return, q is locked, break from q loop */
3638 FC_DISPATCH_LOCKED, /* on return, q is locked, continue on */
3639 FC_DISPATCH_UNLOCKED, /* on return, q is unlocked, continue on */
3640 };
3641
3642
3643 /**
3644 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3645 * @q: fc host request queue
3646 * @shost: scsi host rport attached to
3647 * @job: bsg job to be processed
3648 */
3649 static enum fc_dispatch_result
3650 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3651 struct fc_bsg_job *job)
3652 {
3653 struct fc_internal *i = to_fc_internal(shost->transportt);
3654 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3655 int ret;
3656
3657 /* Validate the host command */
3658 switch (job->request->msgcode) {
3659 case FC_BSG_HST_ADD_RPORT:
3660 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3661 break;
3662
3663 case FC_BSG_HST_DEL_RPORT:
3664 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3665 break;
3666
3667 case FC_BSG_HST_ELS_NOLOGIN:
3668 cmdlen += sizeof(struct fc_bsg_host_els);
3669 /* there better be a xmt and rcv payloads */
3670 if ((!job->request_payload.payload_len) ||
3671 (!job->reply_payload.payload_len)) {
3672 ret = -EINVAL;
3673 goto fail_host_msg;
3674 }
3675 break;
3676
3677 case FC_BSG_HST_CT:
3678 cmdlen += sizeof(struct fc_bsg_host_ct);
3679 /* there better be xmt and rcv payloads */
3680 if ((!job->request_payload.payload_len) ||
3681 (!job->reply_payload.payload_len)) {
3682 ret = -EINVAL;
3683 goto fail_host_msg;
3684 }
3685 break;
3686
3687 case FC_BSG_HST_VENDOR:
3688 cmdlen += sizeof(struct fc_bsg_host_vendor);
3689 if ((shost->hostt->vendor_id == 0L) ||
3690 (job->request->rqst_data.h_vendor.vendor_id !=
3691 shost->hostt->vendor_id)) {
3692 ret = -ESRCH;
3693 goto fail_host_msg;
3694 }
3695 break;
3696
3697 default:
3698 ret = -EBADR;
3699 goto fail_host_msg;
3700 }
3701
3702 /* check if we really have all the request data needed */
3703 if (job->request_len < cmdlen) {
3704 ret = -ENOMSG;
3705 goto fail_host_msg;
3706 }
3707
3708 ret = i->f->bsg_request(job);
3709 if (!ret)
3710 return FC_DISPATCH_UNLOCKED;
3711
3712 fail_host_msg:
3713 /* return the errno failure code as the only status */
3714 BUG_ON(job->reply_len < sizeof(uint32_t));
3715 job->reply->reply_payload_rcv_len = 0;
3716 job->reply->result = ret;
3717 job->reply_len = sizeof(uint32_t);
3718 fc_bsg_jobdone(job);
3719 return FC_DISPATCH_UNLOCKED;
3720 }
3721
3722
3723 /*
3724 * fc_bsg_goose_queue - restart rport queue in case it was stopped
3725 * @rport: rport to be restarted
3726 */
3727 static void
3728 fc_bsg_goose_queue(struct fc_rport *rport)
3729 {
3730 int flagset;
3731 unsigned long flags;
3732
3733 if (!rport->rqst_q)
3734 return;
3735
3736 get_device(&rport->dev);
3737
3738 spin_lock_irqsave(rport->rqst_q->queue_lock, flags);
3739 flagset = test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags) &&
3740 !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags);
3741 if (flagset)
3742 queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q);
3743 __blk_run_queue(rport->rqst_q);
3744 if (flagset)
3745 queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q);
3746 spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags);
3747
3748 put_device(&rport->dev);
3749 }
3750
3751
3752 /**
3753 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3754 * @q: rport request queue
3755 * @shost: scsi host rport attached to
3756 * @rport: rport request destined to
3757 * @job: bsg job to be processed
3758 */
3759 static enum fc_dispatch_result
3760 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3761 struct fc_rport *rport, struct fc_bsg_job *job)
3762 {
3763 struct fc_internal *i = to_fc_internal(shost->transportt);
3764 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3765 int ret;
3766
3767 /* Validate the rport command */
3768 switch (job->request->msgcode) {
3769 case FC_BSG_RPT_ELS:
3770 cmdlen += sizeof(struct fc_bsg_rport_els);
3771 goto check_bidi;
3772
3773 case FC_BSG_RPT_CT:
3774 cmdlen += sizeof(struct fc_bsg_rport_ct);
3775 check_bidi:
3776 /* there better be xmt and rcv payloads */
3777 if ((!job->request_payload.payload_len) ||
3778 (!job->reply_payload.payload_len)) {
3779 ret = -EINVAL;
3780 goto fail_rport_msg;
3781 }
3782 break;
3783 default:
3784 ret = -EBADR;
3785 goto fail_rport_msg;
3786 }
3787
3788 /* check if we really have all the request data needed */
3789 if (job->request_len < cmdlen) {
3790 ret = -ENOMSG;
3791 goto fail_rport_msg;
3792 }
3793
3794 ret = i->f->bsg_request(job);
3795 if (!ret)
3796 return FC_DISPATCH_UNLOCKED;
3797
3798 fail_rport_msg:
3799 /* return the errno failure code as the only status */
3800 BUG_ON(job->reply_len < sizeof(uint32_t));
3801 job->reply->reply_payload_rcv_len = 0;
3802 job->reply->result = ret;
3803 job->reply_len = sizeof(uint32_t);
3804 fc_bsg_jobdone(job);
3805 return FC_DISPATCH_UNLOCKED;
3806 }
3807
3808
3809 /**
3810 * fc_bsg_request_handler - generic handler for bsg requests
3811 * @q: request queue to manage
3812 * @shost: Scsi_Host related to the bsg object
3813 * @rport: FC remote port related to the bsg object (optional)
3814 * @dev: device structure for bsg object
3815 */
3816 static void
3817 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3818 struct fc_rport *rport, struct device *dev)
3819 {
3820 struct request *req;
3821 struct fc_bsg_job *job;
3822 enum fc_dispatch_result ret;
3823
3824 if (!get_device(dev))
3825 return;
3826
3827 while (!blk_queue_plugged(q)) {
3828 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
3829 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3830 break;
3831
3832 req = blk_fetch_request(q);
3833 if (!req)
3834 break;
3835
3836 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3837 req->errors = -ENXIO;
3838 spin_unlock_irq(q->queue_lock);
3839 blk_end_request(req, -ENXIO, blk_rq_bytes(req));
3840 spin_lock_irq(q->queue_lock);
3841 continue;
3842 }
3843
3844 spin_unlock_irq(q->queue_lock);
3845
3846 ret = fc_req_to_bsgjob(shost, rport, req);
3847 if (ret) {
3848 req->errors = ret;
3849 blk_end_request(req, ret, blk_rq_bytes(req));
3850 spin_lock_irq(q->queue_lock);
3851 continue;
3852 }
3853
3854 job = req->special;
3855
3856 /* check if we have the msgcode value at least */
3857 if (job->request_len < sizeof(uint32_t)) {
3858 BUG_ON(job->reply_len < sizeof(uint32_t));
3859 job->reply->reply_payload_rcv_len = 0;
3860 job->reply->result = -ENOMSG;
3861 job->reply_len = sizeof(uint32_t);
3862 fc_bsg_jobdone(job);
3863 spin_lock_irq(q->queue_lock);
3864 continue;
3865 }
3866
3867 /* the dispatch routines will unlock the queue_lock */
3868 if (rport)
3869 ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3870 else
3871 ret = fc_bsg_host_dispatch(q, shost, job);
3872
3873 /* did dispatcher hit state that can't process any more */
3874 if (ret == FC_DISPATCH_BREAK)
3875 break;
3876
3877 /* did dispatcher had released the lock */
3878 if (ret == FC_DISPATCH_UNLOCKED)
3879 spin_lock_irq(q->queue_lock);
3880 }
3881
3882 spin_unlock_irq(q->queue_lock);
3883 put_device(dev);
3884 spin_lock_irq(q->queue_lock);
3885 }
3886
3887
3888 /**
3889 * fc_bsg_host_handler - handler for bsg requests for a fc host
3890 * @q: fc host request queue
3891 */
3892 static void
3893 fc_bsg_host_handler(struct request_queue *q)
3894 {
3895 struct Scsi_Host *shost = q->queuedata;
3896
3897 fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
3898 }
3899
3900
3901 /**
3902 * fc_bsg_rport_handler - handler for bsg requests for a fc rport
3903 * @q: rport request queue
3904 */
3905 static void
3906 fc_bsg_rport_handler(struct request_queue *q)
3907 {
3908 struct fc_rport *rport = q->queuedata;
3909 struct Scsi_Host *shost = rport_to_shost(rport);
3910
3911 fc_bsg_request_handler(q, shost, rport, &rport->dev);
3912 }
3913
3914
3915 /**
3916 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
3917 * @shost: shost for fc_host
3918 * @fc_host: fc_host adding the structures to
3919 */
3920 static int
3921 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
3922 {
3923 struct device *dev = &shost->shost_gendev;
3924 struct fc_internal *i = to_fc_internal(shost->transportt);
3925 struct request_queue *q;
3926 int err;
3927 char bsg_name[20];
3928
3929 fc_host->rqst_q = NULL;
3930
3931 if (!i->f->bsg_request)
3932 return -ENOTSUPP;
3933
3934 snprintf(bsg_name, sizeof(bsg_name),
3935 "fc_host%d", shost->host_no);
3936
3937 q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
3938 if (!q) {
3939 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3940 "initialize - no request queue\n",
3941 shost->host_no);
3942 return -ENOMEM;
3943 }
3944
3945 q->queuedata = shost;
3946 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3947 blk_queue_softirq_done(q, fc_bsg_softirq_done);
3948 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3949 blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
3950
3951 err = bsg_register_queue(q, dev, bsg_name, NULL);
3952 if (err) {
3953 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3954 "initialize - register queue\n",
3955 shost->host_no);
3956 blk_cleanup_queue(q);
3957 return err;
3958 }
3959
3960 fc_host->rqst_q = q;
3961 return 0;
3962 }
3963
3964
3965 /**
3966 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
3967 * @shost: shost that rport is attached to
3968 * @rport: rport that the bsg hooks are being attached to
3969 */
3970 static int
3971 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
3972 {
3973 struct device *dev = &rport->dev;
3974 struct fc_internal *i = to_fc_internal(shost->transportt);
3975 struct request_queue *q;
3976 int err;
3977
3978 rport->rqst_q = NULL;
3979
3980 if (!i->f->bsg_request)
3981 return -ENOTSUPP;
3982
3983 q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
3984 if (!q) {
3985 printk(KERN_ERR "%s: bsg interface failed to "
3986 "initialize - no request queue\n",
3987 dev->kobj.name);
3988 return -ENOMEM;
3989 }
3990
3991 q->queuedata = rport;
3992 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3993 blk_queue_softirq_done(q, fc_bsg_softirq_done);
3994 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3995 blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
3996
3997 err = bsg_register_queue(q, dev, NULL, NULL);
3998 if (err) {
3999 printk(KERN_ERR "%s: bsg interface failed to "
4000 "initialize - register queue\n",
4001 dev->kobj.name);
4002 blk_cleanup_queue(q);
4003 return err;
4004 }
4005
4006 rport->rqst_q = q;
4007 return 0;
4008 }
4009
4010
4011 /**
4012 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4013 * @q: the request_queue that is to be torn down.
4014 */
4015 static void
4016 fc_bsg_remove(struct request_queue *q)
4017 {
4018 if (q) {
4019 bsg_unregister_queue(q);
4020 blk_cleanup_queue(q);
4021 }
4022 }
4023
4024
4025 /* Original Author: Martin Hicks */
4026 MODULE_AUTHOR("James Smart");
4027 MODULE_DESCRIPTION("FC Transport Attributes");
4028 MODULE_LICENSE("GPL");
4029
4030 module_init(fc_transport_init);
4031 module_exit(fc_transport_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree