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mfd: Fix incorrect error check for wm8350-core
[linux-2.6/kvm.git] / drivers / scsi / scsi_transport_fc.c
blob6531c91501be4beae3d9a8e60cff08b26617bd2a
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 return error;
653 error = transport_class_register(&fc_rport_class);
654 if (error)
655 return error;
656 return transport_class_register(&fc_transport_class);
657 }
658
659 static void __exit fc_transport_exit(void)
660 {
661 transport_class_unregister(&fc_transport_class);
662 transport_class_unregister(&fc_rport_class);
663 transport_class_unregister(&fc_host_class);
664 transport_class_unregister(&fc_vport_class);
665 }
666
667 /*
668 * FC Remote Port Attribute Management
669 */
670
671 #define fc_rport_show_function(field, format_string, sz, cast) \
672 static ssize_t \
673 show_fc_rport_##field (struct device *dev, \
674 struct device_attribute *attr, char *buf) \
675 { \
676 struct fc_rport *rport = transport_class_to_rport(dev); \
677 struct Scsi_Host *shost = rport_to_shost(rport); \
678 struct fc_internal *i = to_fc_internal(shost->transportt); \
679 if ((i->f->get_rport_##field) && \
680 !((rport->port_state == FC_PORTSTATE_BLOCKED) || \
681 (rport->port_state == FC_PORTSTATE_DELETED) || \
682 (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
683 i->f->get_rport_##field(rport); \
684 return snprintf(buf, sz, format_string, cast rport->field); \
685 }
686
687 #define fc_rport_store_function(field) \
688 static ssize_t \
689 store_fc_rport_##field(struct device *dev, \
690 struct device_attribute *attr, \
691 const char *buf, size_t count) \
692 { \
693 int val; \
694 struct fc_rport *rport = transport_class_to_rport(dev); \
695 struct Scsi_Host *shost = rport_to_shost(rport); \
696 struct fc_internal *i = to_fc_internal(shost->transportt); \
697 char *cp; \
698 if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
699 (rport->port_state == FC_PORTSTATE_DELETED) || \
700 (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
701 return -EBUSY; \
702 val = simple_strtoul(buf, &cp, 0); \
703 if (*cp && (*cp != '\n')) \
704 return -EINVAL; \
705 i->f->set_rport_##field(rport, val); \
706 return count; \
707 }
708
709 #define fc_rport_rd_attr(field, format_string, sz) \
710 fc_rport_show_function(field, format_string, sz, ) \
711 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
712 show_fc_rport_##field, NULL)
713
714 #define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
715 fc_rport_show_function(field, format_string, sz, (cast)) \
716 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
717 show_fc_rport_##field, NULL)
718
719 #define fc_rport_rw_attr(field, format_string, sz) \
720 fc_rport_show_function(field, format_string, sz, ) \
721 fc_rport_store_function(field) \
722 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
723 show_fc_rport_##field, \
724 store_fc_rport_##field)
725
726
727 #define fc_private_rport_show_function(field, format_string, sz, cast) \
728 static ssize_t \
729 show_fc_rport_##field (struct device *dev, \
730 struct device_attribute *attr, char *buf) \
731 { \
732 struct fc_rport *rport = transport_class_to_rport(dev); \
733 return snprintf(buf, sz, format_string, cast rport->field); \
734 }
735
736 #define fc_private_rport_rd_attr(field, format_string, sz) \
737 fc_private_rport_show_function(field, format_string, sz, ) \
738 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
739 show_fc_rport_##field, NULL)
740
741 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
742 fc_private_rport_show_function(field, format_string, sz, (cast)) \
743 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
744 show_fc_rport_##field, NULL)
745
746
747 #define fc_private_rport_rd_enum_attr(title, maxlen) \
748 static ssize_t \
749 show_fc_rport_##title (struct device *dev, \
750 struct device_attribute *attr, char *buf) \
751 { \
752 struct fc_rport *rport = transport_class_to_rport(dev); \
753 const char *name; \
754 name = get_fc_##title##_name(rport->title); \
755 if (!name) \
756 return -EINVAL; \
757 return snprintf(buf, maxlen, "%s\n", name); \
758 } \
759 static FC_DEVICE_ATTR(rport, title, S_IRUGO, \
760 show_fc_rport_##title, NULL)
761
762
763 #define SETUP_RPORT_ATTRIBUTE_RD(field) \
764 i->private_rport_attrs[count] = device_attr_rport_##field; \
765 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
766 i->private_rport_attrs[count].store = NULL; \
767 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
768 if (i->f->show_rport_##field) \
769 count++
770
771 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
772 i->private_rport_attrs[count] = device_attr_rport_##field; \
773 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
774 i->private_rport_attrs[count].store = NULL; \
775 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
776 count++
777
778 #define SETUP_RPORT_ATTRIBUTE_RW(field) \
779 i->private_rport_attrs[count] = device_attr_rport_##field; \
780 if (!i->f->set_rport_##field) { \
781 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
782 i->private_rport_attrs[count].store = NULL; \
783 } \
784 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
785 if (i->f->show_rport_##field) \
786 count++
787
788 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
789 { \
790 i->private_rport_attrs[count] = device_attr_rport_##field; \
791 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
792 count++; \
793 }
794
795
796 /* The FC Transport Remote Port Attributes: */
797
798 /* Fixed Remote Port Attributes */
799
800 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
801
802 static ssize_t
803 show_fc_rport_supported_classes (struct device *dev,
804 struct device_attribute *attr, char *buf)
805 {
806 struct fc_rport *rport = transport_class_to_rport(dev);
807 if (rport->supported_classes == FC_COS_UNSPECIFIED)
808 return snprintf(buf, 20, "unspecified\n");
809 return get_fc_cos_names(rport->supported_classes, buf);
810 }
811 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
812 show_fc_rport_supported_classes, NULL);
813
814 /* Dynamic Remote Port Attributes */
815
816 /*
817 * dev_loss_tmo attribute
818 */
819 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
820 static ssize_t
821 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
822 const char *buf, size_t count)
823 {
824 int val;
825 struct fc_rport *rport = transport_class_to_rport(dev);
826 struct Scsi_Host *shost = rport_to_shost(rport);
827 struct fc_internal *i = to_fc_internal(shost->transportt);
828 char *cp;
829 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
830 (rport->port_state == FC_PORTSTATE_DELETED) ||
831 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
832 return -EBUSY;
833 val = simple_strtoul(buf, &cp, 0);
834 if ((*cp && (*cp != '\n')) ||
835 (val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
836 return -EINVAL;
837 i->f->set_rport_dev_loss_tmo(rport, val);
838 return count;
839 }
840 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
841 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
842
843
844 /* Private Remote Port Attributes */
845
846 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
847 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
848 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
849
850 static ssize_t
851 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
852 char *buf)
853 {
854 struct fc_rport *rport = transport_class_to_rport(dev);
855
856 /* identify any roles that are port_id specific */
857 if ((rport->port_id != -1) &&
858 (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
859 FC_WELLKNOWN_PORTID_MASK) {
860 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
861 case FC_FPORT_PORTID:
862 return snprintf(buf, 30, "Fabric Port\n");
863 case FC_FABCTLR_PORTID:
864 return snprintf(buf, 30, "Fabric Controller\n");
865 case FC_DIRSRVR_PORTID:
866 return snprintf(buf, 30, "Directory Server\n");
867 case FC_TIMESRVR_PORTID:
868 return snprintf(buf, 30, "Time Server\n");
869 case FC_MGMTSRVR_PORTID:
870 return snprintf(buf, 30, "Management Server\n");
871 default:
872 return snprintf(buf, 30, "Unknown Fabric Entity\n");
873 }
874 } else {
875 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
876 return snprintf(buf, 20, "unknown\n");
877 return get_fc_port_roles_names(rport->roles, buf);
878 }
879 }
880 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
881 show_fc_rport_roles, NULL);
882
883 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
884 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
885
886 /*
887 * fast_io_fail_tmo attribute
888 */
889 static ssize_t
890 show_fc_rport_fast_io_fail_tmo (struct device *dev,
891 struct device_attribute *attr, char *buf)
892 {
893 struct fc_rport *rport = transport_class_to_rport(dev);
894
895 if (rport->fast_io_fail_tmo == -1)
896 return snprintf(buf, 5, "off\n");
897 return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
898 }
899
900 static ssize_t
901 store_fc_rport_fast_io_fail_tmo(struct device *dev,
902 struct device_attribute *attr, const char *buf,
903 size_t count)
904 {
905 int val;
906 char *cp;
907 struct fc_rport *rport = transport_class_to_rport(dev);
908
909 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
910 (rport->port_state == FC_PORTSTATE_DELETED) ||
911 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
912 return -EBUSY;
913 if (strncmp(buf, "off", 3) == 0)
914 rport->fast_io_fail_tmo = -1;
915 else {
916 val = simple_strtoul(buf, &cp, 0);
917 if ((*cp && (*cp != '\n')) ||
918 (val < 0) || (val >= rport->dev_loss_tmo))
919 return -EINVAL;
920 rport->fast_io_fail_tmo = val;
921 }
922 return count;
923 }
924 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
925 show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
926
927
928 /*
929 * FC SCSI Target Attribute Management
930 */
931
932 /*
933 * Note: in the target show function we recognize when the remote
934 * port is in the heirarchy and do not allow the driver to get
935 * involved in sysfs functions. The driver only gets involved if
936 * it's the "old" style that doesn't use rports.
937 */
938 #define fc_starget_show_function(field, format_string, sz, cast) \
939 static ssize_t \
940 show_fc_starget_##field (struct device *dev, \
941 struct device_attribute *attr, char *buf) \
942 { \
943 struct scsi_target *starget = transport_class_to_starget(dev); \
944 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
945 struct fc_internal *i = to_fc_internal(shost->transportt); \
946 struct fc_rport *rport = starget_to_rport(starget); \
947 if (rport) \
948 fc_starget_##field(starget) = rport->field; \
949 else if (i->f->get_starget_##field) \
950 i->f->get_starget_##field(starget); \
951 return snprintf(buf, sz, format_string, \
952 cast fc_starget_##field(starget)); \
953 }
954
955 #define fc_starget_rd_attr(field, format_string, sz) \
956 fc_starget_show_function(field, format_string, sz, ) \
957 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
958 show_fc_starget_##field, NULL)
959
960 #define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
961 fc_starget_show_function(field, format_string, sz, (cast)) \
962 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
963 show_fc_starget_##field, NULL)
964
965 #define SETUP_STARGET_ATTRIBUTE_RD(field) \
966 i->private_starget_attrs[count] = device_attr_starget_##field; \
967 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
968 i->private_starget_attrs[count].store = NULL; \
969 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
970 if (i->f->show_starget_##field) \
971 count++
972
973 #define SETUP_STARGET_ATTRIBUTE_RW(field) \
974 i->private_starget_attrs[count] = device_attr_starget_##field; \
975 if (!i->f->set_starget_##field) { \
976 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
977 i->private_starget_attrs[count].store = NULL; \
978 } \
979 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
980 if (i->f->show_starget_##field) \
981 count++
982
983 /* The FC Transport SCSI Target Attributes: */
984 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
985 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
986 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
987
988
989 /*
990 * FC Virtual Port Attribute Management
991 */
992
993 #define fc_vport_show_function(field, format_string, sz, cast) \
994 static ssize_t \
995 show_fc_vport_##field (struct device *dev, \
996 struct device_attribute *attr, char *buf) \
997 { \
998 struct fc_vport *vport = transport_class_to_vport(dev); \
999 struct Scsi_Host *shost = vport_to_shost(vport); \
1000 struct fc_internal *i = to_fc_internal(shost->transportt); \
1001 if ((i->f->get_vport_##field) && \
1002 !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))) \
1003 i->f->get_vport_##field(vport); \
1004 return snprintf(buf, sz, format_string, cast vport->field); \
1005 }
1006
1007 #define fc_vport_store_function(field) \
1008 static ssize_t \
1009 store_fc_vport_##field(struct device *dev, \
1010 struct device_attribute *attr, \
1011 const char *buf, size_t count) \
1012 { \
1013 int val; \
1014 struct fc_vport *vport = transport_class_to_vport(dev); \
1015 struct Scsi_Host *shost = vport_to_shost(vport); \
1016 struct fc_internal *i = to_fc_internal(shost->transportt); \
1017 char *cp; \
1018 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1019 return -EBUSY; \
1020 val = simple_strtoul(buf, &cp, 0); \
1021 if (*cp && (*cp != '\n')) \
1022 return -EINVAL; \
1023 i->f->set_vport_##field(vport, val); \
1024 return count; \
1025 }
1026
1027 #define fc_vport_store_str_function(field, slen) \
1028 static ssize_t \
1029 store_fc_vport_##field(struct device *dev, \
1030 struct device_attribute *attr, \
1031 const char *buf, size_t count) \
1032 { \
1033 struct fc_vport *vport = transport_class_to_vport(dev); \
1034 struct Scsi_Host *shost = vport_to_shost(vport); \
1035 struct fc_internal *i = to_fc_internal(shost->transportt); \
1036 unsigned int cnt=count; \
1037 \
1038 /* count may include a LF at end of string */ \
1039 if (buf[cnt-1] == '\n') \
1040 cnt--; \
1041 if (cnt > ((slen) - 1)) \
1042 return -EINVAL; \
1043 memcpy(vport->field, buf, cnt); \
1044 i->f->set_vport_##field(vport); \
1045 return count; \
1046 }
1047
1048 #define fc_vport_rd_attr(field, format_string, sz) \
1049 fc_vport_show_function(field, format_string, sz, ) \
1050 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1051 show_fc_vport_##field, NULL)
1052
1053 #define fc_vport_rd_attr_cast(field, format_string, sz, cast) \
1054 fc_vport_show_function(field, format_string, sz, (cast)) \
1055 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1056 show_fc_vport_##field, NULL)
1057
1058 #define fc_vport_rw_attr(field, format_string, sz) \
1059 fc_vport_show_function(field, format_string, sz, ) \
1060 fc_vport_store_function(field) \
1061 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1062 show_fc_vport_##field, \
1063 store_fc_vport_##field)
1064
1065 #define fc_private_vport_show_function(field, format_string, sz, cast) \
1066 static ssize_t \
1067 show_fc_vport_##field (struct device *dev, \
1068 struct device_attribute *attr, char *buf) \
1069 { \
1070 struct fc_vport *vport = transport_class_to_vport(dev); \
1071 return snprintf(buf, sz, format_string, cast vport->field); \
1072 }
1073
1074 #define fc_private_vport_store_u32_function(field) \
1075 static ssize_t \
1076 store_fc_vport_##field(struct device *dev, \
1077 struct device_attribute *attr, \
1078 const char *buf, size_t count) \
1079 { \
1080 u32 val; \
1081 struct fc_vport *vport = transport_class_to_vport(dev); \
1082 char *cp; \
1083 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1084 return -EBUSY; \
1085 val = simple_strtoul(buf, &cp, 0); \
1086 if (*cp && (*cp != '\n')) \
1087 return -EINVAL; \
1088 vport->field = val; \
1089 return count; \
1090 }
1091
1092
1093 #define fc_private_vport_rd_attr(field, format_string, sz) \
1094 fc_private_vport_show_function(field, format_string, sz, ) \
1095 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1096 show_fc_vport_##field, NULL)
1097
1098 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast) \
1099 fc_private_vport_show_function(field, format_string, sz, (cast)) \
1100 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1101 show_fc_vport_##field, NULL)
1102
1103 #define fc_private_vport_rw_u32_attr(field, format_string, sz) \
1104 fc_private_vport_show_function(field, format_string, sz, ) \
1105 fc_private_vport_store_u32_function(field) \
1106 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1107 show_fc_vport_##field, \
1108 store_fc_vport_##field)
1109
1110
1111 #define fc_private_vport_rd_enum_attr(title, maxlen) \
1112 static ssize_t \
1113 show_fc_vport_##title (struct device *dev, \
1114 struct device_attribute *attr, \
1115 char *buf) \
1116 { \
1117 struct fc_vport *vport = transport_class_to_vport(dev); \
1118 const char *name; \
1119 name = get_fc_##title##_name(vport->title); \
1120 if (!name) \
1121 return -EINVAL; \
1122 return snprintf(buf, maxlen, "%s\n", name); \
1123 } \
1124 static FC_DEVICE_ATTR(vport, title, S_IRUGO, \
1125 show_fc_vport_##title, NULL)
1126
1127
1128 #define SETUP_VPORT_ATTRIBUTE_RD(field) \
1129 i->private_vport_attrs[count] = device_attr_vport_##field; \
1130 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1131 i->private_vport_attrs[count].store = NULL; \
1132 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1133 if (i->f->get_##field) \
1134 count++
1135 /* NOTE: Above MACRO differs: checks function not show bit */
1136
1137 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field) \
1138 i->private_vport_attrs[count] = device_attr_vport_##field; \
1139 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1140 i->private_vport_attrs[count].store = NULL; \
1141 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1142 count++
1143
1144 #define SETUP_VPORT_ATTRIBUTE_WR(field) \
1145 i->private_vport_attrs[count] = device_attr_vport_##field; \
1146 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1147 if (i->f->field) \
1148 count++
1149 /* NOTE: Above MACRO differs: checks function */
1150
1151 #define SETUP_VPORT_ATTRIBUTE_RW(field) \
1152 i->private_vport_attrs[count] = device_attr_vport_##field; \
1153 if (!i->f->set_vport_##field) { \
1154 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1155 i->private_vport_attrs[count].store = NULL; \
1156 } \
1157 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1158 count++
1159 /* NOTE: Above MACRO differs: does not check show bit */
1160
1161 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field) \
1162 { \
1163 i->private_vport_attrs[count] = device_attr_vport_##field; \
1164 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1165 count++; \
1166 }
1167
1168
1169 /* The FC Transport Virtual Port Attributes: */
1170
1171 /* Fixed Virtual Port Attributes */
1172
1173 /* Dynamic Virtual Port Attributes */
1174
1175 /* Private Virtual Port Attributes */
1176
1177 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1178 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1179 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1180 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1181
1182 static ssize_t
1183 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1184 char *buf)
1185 {
1186 struct fc_vport *vport = transport_class_to_vport(dev);
1187
1188 if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1189 return snprintf(buf, 20, "unknown\n");
1190 return get_fc_port_roles_names(vport->roles, buf);
1191 }
1192 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1193
1194 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1195
1196 fc_private_vport_show_function(symbolic_name, "%s\n",
1197 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1198 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1199 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1200 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1201
1202 static ssize_t
1203 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1204 const char *buf, size_t count)
1205 {
1206 struct fc_vport *vport = transport_class_to_vport(dev);
1207 struct Scsi_Host *shost = vport_to_shost(vport);
1208
1209 fc_queue_work(shost, &vport->vport_delete_work);
1210 return count;
1211 }
1212 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1213 NULL, store_fc_vport_delete);
1214
1215
1216 /*
1217 * Enable/Disable vport
1218 * Write "1" to disable, write "0" to enable
1219 */
1220 static ssize_t
1221 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1222 const char *buf,
1223 size_t count)
1224 {
1225 struct fc_vport *vport = transport_class_to_vport(dev);
1226 struct Scsi_Host *shost = vport_to_shost(vport);
1227 struct fc_internal *i = to_fc_internal(shost->transportt);
1228 int stat;
1229
1230 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1231 return -EBUSY;
1232
1233 if (*buf == '0') {
1234 if (vport->vport_state != FC_VPORT_DISABLED)
1235 return -EALREADY;
1236 } else if (*buf == '1') {
1237 if (vport->vport_state == FC_VPORT_DISABLED)
1238 return -EALREADY;
1239 } else
1240 return -EINVAL;
1241
1242 stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1243 return stat ? stat : count;
1244 }
1245 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1246 NULL, store_fc_vport_disable);
1247
1248
1249 /*
1250 * Host Attribute Management
1251 */
1252
1253 #define fc_host_show_function(field, format_string, sz, cast) \
1254 static ssize_t \
1255 show_fc_host_##field (struct device *dev, \
1256 struct device_attribute *attr, char *buf) \
1257 { \
1258 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1259 struct fc_internal *i = to_fc_internal(shost->transportt); \
1260 if (i->f->get_host_##field) \
1261 i->f->get_host_##field(shost); \
1262 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1263 }
1264
1265 #define fc_host_store_function(field) \
1266 static ssize_t \
1267 store_fc_host_##field(struct device *dev, \
1268 struct device_attribute *attr, \
1269 const char *buf, size_t count) \
1270 { \
1271 int val; \
1272 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1273 struct fc_internal *i = to_fc_internal(shost->transportt); \
1274 char *cp; \
1275 \
1276 val = simple_strtoul(buf, &cp, 0); \
1277 if (*cp && (*cp != '\n')) \
1278 return -EINVAL; \
1279 i->f->set_host_##field(shost, val); \
1280 return count; \
1281 }
1282
1283 #define fc_host_store_str_function(field, slen) \
1284 static ssize_t \
1285 store_fc_host_##field(struct device *dev, \
1286 struct device_attribute *attr, \
1287 const char *buf, size_t count) \
1288 { \
1289 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1290 struct fc_internal *i = to_fc_internal(shost->transportt); \
1291 unsigned int cnt=count; \
1292 \
1293 /* count may include a LF at end of string */ \
1294 if (buf[cnt-1] == '\n') \
1295 cnt--; \
1296 if (cnt > ((slen) - 1)) \
1297 return -EINVAL; \
1298 memcpy(fc_host_##field(shost), buf, cnt); \
1299 i->f->set_host_##field(shost); \
1300 return count; \
1301 }
1302
1303 #define fc_host_rd_attr(field, format_string, sz) \
1304 fc_host_show_function(field, format_string, sz, ) \
1305 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1306 show_fc_host_##field, NULL)
1307
1308 #define fc_host_rd_attr_cast(field, format_string, sz, cast) \
1309 fc_host_show_function(field, format_string, sz, (cast)) \
1310 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1311 show_fc_host_##field, NULL)
1312
1313 #define fc_host_rw_attr(field, format_string, sz) \
1314 fc_host_show_function(field, format_string, sz, ) \
1315 fc_host_store_function(field) \
1316 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
1317 show_fc_host_##field, \
1318 store_fc_host_##field)
1319
1320 #define fc_host_rd_enum_attr(title, maxlen) \
1321 static ssize_t \
1322 show_fc_host_##title (struct device *dev, \
1323 struct device_attribute *attr, char *buf) \
1324 { \
1325 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1326 struct fc_internal *i = to_fc_internal(shost->transportt); \
1327 const char *name; \
1328 if (i->f->get_host_##title) \
1329 i->f->get_host_##title(shost); \
1330 name = get_fc_##title##_name(fc_host_##title(shost)); \
1331 if (!name) \
1332 return -EINVAL; \
1333 return snprintf(buf, maxlen, "%s\n", name); \
1334 } \
1335 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1336
1337 #define SETUP_HOST_ATTRIBUTE_RD(field) \
1338 i->private_host_attrs[count] = device_attr_host_##field; \
1339 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1340 i->private_host_attrs[count].store = NULL; \
1341 i->host_attrs[count] = &i->private_host_attrs[count]; \
1342 if (i->f->show_host_##field) \
1343 count++
1344
1345 #define SETUP_HOST_ATTRIBUTE_RD_NS(field) \
1346 i->private_host_attrs[count] = device_attr_host_##field; \
1347 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1348 i->private_host_attrs[count].store = NULL; \
1349 i->host_attrs[count] = &i->private_host_attrs[count]; \
1350 count++
1351
1352 #define SETUP_HOST_ATTRIBUTE_RW(field) \
1353 i->private_host_attrs[count] = device_attr_host_##field; \
1354 if (!i->f->set_host_##field) { \
1355 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1356 i->private_host_attrs[count].store = NULL; \
1357 } \
1358 i->host_attrs[count] = &i->private_host_attrs[count]; \
1359 if (i->f->show_host_##field) \
1360 count++
1361
1362
1363 #define fc_private_host_show_function(field, format_string, sz, cast) \
1364 static ssize_t \
1365 show_fc_host_##field (struct device *dev, \
1366 struct device_attribute *attr, char *buf) \
1367 { \
1368 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1369 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1370 }
1371
1372 #define fc_private_host_rd_attr(field, format_string, sz) \
1373 fc_private_host_show_function(field, format_string, sz, ) \
1374 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1375 show_fc_host_##field, NULL)
1376
1377 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
1378 fc_private_host_show_function(field, format_string, sz, (cast)) \
1379 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1380 show_fc_host_##field, NULL)
1381
1382 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
1383 i->private_host_attrs[count] = device_attr_host_##field; \
1384 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1385 i->private_host_attrs[count].store = NULL; \
1386 i->host_attrs[count] = &i->private_host_attrs[count]; \
1387 count++
1388
1389 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
1390 { \
1391 i->private_host_attrs[count] = device_attr_host_##field; \
1392 i->host_attrs[count] = &i->private_host_attrs[count]; \
1393 count++; \
1394 }
1395
1396
1397 /* Fixed Host Attributes */
1398
1399 static ssize_t
1400 show_fc_host_supported_classes (struct device *dev,
1401 struct device_attribute *attr, char *buf)
1402 {
1403 struct Scsi_Host *shost = transport_class_to_shost(dev);
1404
1405 if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1406 return snprintf(buf, 20, "unspecified\n");
1407
1408 return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1409 }
1410 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1411 show_fc_host_supported_classes, NULL);
1412
1413 static ssize_t
1414 show_fc_host_supported_fc4s (struct device *dev,
1415 struct device_attribute *attr, char *buf)
1416 {
1417 struct Scsi_Host *shost = transport_class_to_shost(dev);
1418 return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1419 }
1420 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1421 show_fc_host_supported_fc4s, NULL);
1422
1423 static ssize_t
1424 show_fc_host_supported_speeds (struct device *dev,
1425 struct device_attribute *attr, char *buf)
1426 {
1427 struct Scsi_Host *shost = transport_class_to_shost(dev);
1428
1429 if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1430 return snprintf(buf, 20, "unknown\n");
1431
1432 return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1433 }
1434 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1435 show_fc_host_supported_speeds, NULL);
1436
1437
1438 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1439 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1440 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1441 unsigned long long);
1442 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1443 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1444 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1445
1446
1447 /* Dynamic Host Attributes */
1448
1449 static ssize_t
1450 show_fc_host_active_fc4s (struct device *dev,
1451 struct device_attribute *attr, char *buf)
1452 {
1453 struct Scsi_Host *shost = transport_class_to_shost(dev);
1454 struct fc_internal *i = to_fc_internal(shost->transportt);
1455
1456 if (i->f->get_host_active_fc4s)
1457 i->f->get_host_active_fc4s(shost);
1458
1459 return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1460 }
1461 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1462 show_fc_host_active_fc4s, NULL);
1463
1464 static ssize_t
1465 show_fc_host_speed (struct device *dev,
1466 struct device_attribute *attr, char *buf)
1467 {
1468 struct Scsi_Host *shost = transport_class_to_shost(dev);
1469 struct fc_internal *i = to_fc_internal(shost->transportt);
1470
1471 if (i->f->get_host_speed)
1472 i->f->get_host_speed(shost);
1473
1474 if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1475 return snprintf(buf, 20, "unknown\n");
1476
1477 return get_fc_port_speed_names(fc_host_speed(shost), buf);
1478 }
1479 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1480 show_fc_host_speed, NULL);
1481
1482
1483 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1484 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1485 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1486 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1487 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1488
1489 fc_private_host_show_function(system_hostname, "%s\n",
1490 FC_SYMBOLIC_NAME_SIZE + 1, )
1491 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1492 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1493 show_fc_host_system_hostname, store_fc_host_system_hostname);
1494
1495
1496 /* Private Host Attributes */
1497
1498 static ssize_t
1499 show_fc_private_host_tgtid_bind_type(struct device *dev,
1500 struct device_attribute *attr, char *buf)
1501 {
1502 struct Scsi_Host *shost = transport_class_to_shost(dev);
1503 const char *name;
1504
1505 name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1506 if (!name)
1507 return -EINVAL;
1508 return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1509 }
1510
1511 #define get_list_head_entry(pos, head, member) \
1512 pos = list_entry((head)->next, typeof(*pos), member)
1513
1514 static ssize_t
1515 store_fc_private_host_tgtid_bind_type(struct device *dev,
1516 struct device_attribute *attr, const char *buf, size_t count)
1517 {
1518 struct Scsi_Host *shost = transport_class_to_shost(dev);
1519 struct fc_rport *rport;
1520 enum fc_tgtid_binding_type val;
1521 unsigned long flags;
1522
1523 if (get_fc_tgtid_bind_type_match(buf, &val))
1524 return -EINVAL;
1525
1526 /* if changing bind type, purge all unused consistent bindings */
1527 if (val != fc_host_tgtid_bind_type(shost)) {
1528 spin_lock_irqsave(shost->host_lock, flags);
1529 while (!list_empty(&fc_host_rport_bindings(shost))) {
1530 get_list_head_entry(rport,
1531 &fc_host_rport_bindings(shost), peers);
1532 list_del(&rport->peers);
1533 rport->port_state = FC_PORTSTATE_DELETED;
1534 fc_queue_work(shost, &rport->rport_delete_work);
1535 }
1536 spin_unlock_irqrestore(shost->host_lock, flags);
1537 }
1538
1539 fc_host_tgtid_bind_type(shost) = val;
1540 return count;
1541 }
1542
1543 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1544 show_fc_private_host_tgtid_bind_type,
1545 store_fc_private_host_tgtid_bind_type);
1546
1547 static ssize_t
1548 store_fc_private_host_issue_lip(struct device *dev,
1549 struct device_attribute *attr, const char *buf, size_t count)
1550 {
1551 struct Scsi_Host *shost = transport_class_to_shost(dev);
1552 struct fc_internal *i = to_fc_internal(shost->transportt);
1553 int ret;
1554
1555 /* ignore any data value written to the attribute */
1556 if (i->f->issue_fc_host_lip) {
1557 ret = i->f->issue_fc_host_lip(shost);
1558 return ret ? ret: count;
1559 }
1560
1561 return -ENOENT;
1562 }
1563
1564 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1565 store_fc_private_host_issue_lip);
1566
1567 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1568
1569
1570 /*
1571 * Host Statistics Management
1572 */
1573
1574 /* Show a given an attribute in the statistics group */
1575 static ssize_t
1576 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1577 {
1578 struct Scsi_Host *shost = transport_class_to_shost(dev);
1579 struct fc_internal *i = to_fc_internal(shost->transportt);
1580 struct fc_host_statistics *stats;
1581 ssize_t ret = -ENOENT;
1582
1583 if (offset > sizeof(struct fc_host_statistics) ||
1584 offset % sizeof(u64) != 0)
1585 WARN_ON(1);
1586
1587 if (i->f->get_fc_host_stats) {
1588 stats = (i->f->get_fc_host_stats)(shost);
1589 if (stats)
1590 ret = snprintf(buf, 20, "0x%llx\n",
1591 (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1592 }
1593 return ret;
1594 }
1595
1596
1597 /* generate a read-only statistics attribute */
1598 #define fc_host_statistic(name) \
1599 static ssize_t show_fcstat_##name(struct device *cd, \
1600 struct device_attribute *attr, \
1601 char *buf) \
1602 { \
1603 return fc_stat_show(cd, buf, \
1604 offsetof(struct fc_host_statistics, name)); \
1605 } \
1606 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1607
1608 fc_host_statistic(seconds_since_last_reset);
1609 fc_host_statistic(tx_frames);
1610 fc_host_statistic(tx_words);
1611 fc_host_statistic(rx_frames);
1612 fc_host_statistic(rx_words);
1613 fc_host_statistic(lip_count);
1614 fc_host_statistic(nos_count);
1615 fc_host_statistic(error_frames);
1616 fc_host_statistic(dumped_frames);
1617 fc_host_statistic(link_failure_count);
1618 fc_host_statistic(loss_of_sync_count);
1619 fc_host_statistic(loss_of_signal_count);
1620 fc_host_statistic(prim_seq_protocol_err_count);
1621 fc_host_statistic(invalid_tx_word_count);
1622 fc_host_statistic(invalid_crc_count);
1623 fc_host_statistic(fcp_input_requests);
1624 fc_host_statistic(fcp_output_requests);
1625 fc_host_statistic(fcp_control_requests);
1626 fc_host_statistic(fcp_input_megabytes);
1627 fc_host_statistic(fcp_output_megabytes);
1628
1629 static ssize_t
1630 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1631 const char *buf, size_t count)
1632 {
1633 struct Scsi_Host *shost = transport_class_to_shost(dev);
1634 struct fc_internal *i = to_fc_internal(shost->transportt);
1635
1636 /* ignore any data value written to the attribute */
1637 if (i->f->reset_fc_host_stats) {
1638 i->f->reset_fc_host_stats(shost);
1639 return count;
1640 }
1641
1642 return -ENOENT;
1643 }
1644 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1645 fc_reset_statistics);
1646
1647 static struct attribute *fc_statistics_attrs[] = {
1648 &device_attr_host_seconds_since_last_reset.attr,
1649 &device_attr_host_tx_frames.attr,
1650 &device_attr_host_tx_words.attr,
1651 &device_attr_host_rx_frames.attr,
1652 &device_attr_host_rx_words.attr,
1653 &device_attr_host_lip_count.attr,
1654 &device_attr_host_nos_count.attr,
1655 &device_attr_host_error_frames.attr,
1656 &device_attr_host_dumped_frames.attr,
1657 &device_attr_host_link_failure_count.attr,
1658 &device_attr_host_loss_of_sync_count.attr,
1659 &device_attr_host_loss_of_signal_count.attr,
1660 &device_attr_host_prim_seq_protocol_err_count.attr,
1661 &device_attr_host_invalid_tx_word_count.attr,
1662 &device_attr_host_invalid_crc_count.attr,
1663 &device_attr_host_fcp_input_requests.attr,
1664 &device_attr_host_fcp_output_requests.attr,
1665 &device_attr_host_fcp_control_requests.attr,
1666 &device_attr_host_fcp_input_megabytes.attr,
1667 &device_attr_host_fcp_output_megabytes.attr,
1668 &device_attr_host_reset_statistics.attr,
1669 NULL
1670 };
1671
1672 static struct attribute_group fc_statistics_group = {
1673 .name = "statistics",
1674 .attrs = fc_statistics_attrs,
1675 };
1676
1677
1678 /* Host Vport Attributes */
1679
1680 static int
1681 fc_parse_wwn(const char *ns, u64 *nm)
1682 {
1683 unsigned int i, j;
1684 u8 wwn[8];
1685
1686 memset(wwn, 0, sizeof(wwn));
1687
1688 /* Validate and store the new name */
1689 for (i=0, j=0; i < 16; i++) {
1690 if ((*ns >= 'a') && (*ns <= 'f'))
1691 j = ((j << 4) | ((*ns++ -'a') + 10));
1692 else if ((*ns >= 'A') && (*ns <= 'F'))
1693 j = ((j << 4) | ((*ns++ -'A') + 10));
1694 else if ((*ns >= '0') && (*ns <= '9'))
1695 j = ((j << 4) | (*ns++ -'0'));
1696 else
1697 return -EINVAL;
1698 if (i % 2) {
1699 wwn[i/2] = j & 0xff;
1700 j = 0;
1701 }
1702 }
1703
1704 *nm = wwn_to_u64(wwn);
1705
1706 return 0;
1707 }
1708
1709
1710 /*
1711 * "Short-cut" sysfs variable to create a new vport on a FC Host.
1712 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1713 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1714 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1715 */
1716 static ssize_t
1717 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1718 const char *buf, size_t count)
1719 {
1720 struct Scsi_Host *shost = transport_class_to_shost(dev);
1721 struct fc_vport_identifiers vid;
1722 struct fc_vport *vport;
1723 unsigned int cnt=count;
1724 int stat;
1725
1726 memset(&vid, 0, sizeof(vid));
1727
1728 /* count may include a LF at end of string */
1729 if (buf[cnt-1] == '\n')
1730 cnt--;
1731
1732 /* validate we have enough characters for WWPN */
1733 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1734 return -EINVAL;
1735
1736 stat = fc_parse_wwn(&buf[0], &vid.port_name);
1737 if (stat)
1738 return stat;
1739
1740 stat = fc_parse_wwn(&buf[17], &vid.node_name);
1741 if (stat)
1742 return stat;
1743
1744 vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1745 vid.vport_type = FC_PORTTYPE_NPIV;
1746 /* vid.symbolic_name is already zero/NULL's */
1747 vid.disable = false; /* always enabled */
1748
1749 /* we only allow support on Channel 0 !!! */
1750 stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1751 return stat ? stat : count;
1752 }
1753 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1754 store_fc_host_vport_create);
1755
1756
1757 /*
1758 * "Short-cut" sysfs variable to delete a vport on a FC Host.
1759 * Vport is identified by a string containing "<WWPN>:<WWNN>".
1760 * The WWNs are specified as hex characters, and may *not* contain
1761 * any prefixes (e.g. 0x, x, etc)
1762 */
1763 static ssize_t
1764 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1765 const char *buf, size_t count)
1766 {
1767 struct Scsi_Host *shost = transport_class_to_shost(dev);
1768 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1769 struct fc_vport *vport;
1770 u64 wwpn, wwnn;
1771 unsigned long flags;
1772 unsigned int cnt=count;
1773 int stat, match;
1774
1775 /* count may include a LF at end of string */
1776 if (buf[cnt-1] == '\n')
1777 cnt--;
1778
1779 /* validate we have enough characters for WWPN */
1780 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1781 return -EINVAL;
1782
1783 stat = fc_parse_wwn(&buf[0], &wwpn);
1784 if (stat)
1785 return stat;
1786
1787 stat = fc_parse_wwn(&buf[17], &wwnn);
1788 if (stat)
1789 return stat;
1790
1791 spin_lock_irqsave(shost->host_lock, flags);
1792 match = 0;
1793 /* we only allow support on Channel 0 !!! */
1794 list_for_each_entry(vport, &fc_host->vports, peers) {
1795 if ((vport->channel == 0) &&
1796 (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1797 match = 1;
1798 break;
1799 }
1800 }
1801 spin_unlock_irqrestore(shost->host_lock, flags);
1802
1803 if (!match)
1804 return -ENODEV;
1805
1806 stat = fc_vport_terminate(vport);
1807 return stat ? stat : count;
1808 }
1809 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1810 store_fc_host_vport_delete);
1811
1812
1813 static int fc_host_match(struct attribute_container *cont,
1814 struct device *dev)
1815 {
1816 struct Scsi_Host *shost;
1817 struct fc_internal *i;
1818
1819 if (!scsi_is_host_device(dev))
1820 return 0;
1821
1822 shost = dev_to_shost(dev);
1823 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1824 != &fc_host_class.class)
1825 return 0;
1826
1827 i = to_fc_internal(shost->transportt);
1828
1829 return &i->t.host_attrs.ac == cont;
1830 }
1831
1832 static int fc_target_match(struct attribute_container *cont,
1833 struct device *dev)
1834 {
1835 struct Scsi_Host *shost;
1836 struct fc_internal *i;
1837
1838 if (!scsi_is_target_device(dev))
1839 return 0;
1840
1841 shost = dev_to_shost(dev->parent);
1842 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1843 != &fc_host_class.class)
1844 return 0;
1845
1846 i = to_fc_internal(shost->transportt);
1847
1848 return &i->t.target_attrs.ac == cont;
1849 }
1850
1851 static void fc_rport_dev_release(struct device *dev)
1852 {
1853 struct fc_rport *rport = dev_to_rport(dev);
1854 put_device(dev->parent);
1855 kfree(rport);
1856 }
1857
1858 int scsi_is_fc_rport(const struct device *dev)
1859 {
1860 return dev->release == fc_rport_dev_release;
1861 }
1862 EXPORT_SYMBOL(scsi_is_fc_rport);
1863
1864 static int fc_rport_match(struct attribute_container *cont,
1865 struct device *dev)
1866 {
1867 struct Scsi_Host *shost;
1868 struct fc_internal *i;
1869
1870 if (!scsi_is_fc_rport(dev))
1871 return 0;
1872
1873 shost = dev_to_shost(dev->parent);
1874 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1875 != &fc_host_class.class)
1876 return 0;
1877
1878 i = to_fc_internal(shost->transportt);
1879
1880 return &i->rport_attr_cont.ac == cont;
1881 }
1882
1883
1884 static void fc_vport_dev_release(struct device *dev)
1885 {
1886 struct fc_vport *vport = dev_to_vport(dev);
1887 put_device(dev->parent); /* release kobj parent */
1888 kfree(vport);
1889 }
1890
1891 int scsi_is_fc_vport(const struct device *dev)
1892 {
1893 return dev->release == fc_vport_dev_release;
1894 }
1895 EXPORT_SYMBOL(scsi_is_fc_vport);
1896
1897 static int fc_vport_match(struct attribute_container *cont,
1898 struct device *dev)
1899 {
1900 struct fc_vport *vport;
1901 struct Scsi_Host *shost;
1902 struct fc_internal *i;
1903
1904 if (!scsi_is_fc_vport(dev))
1905 return 0;
1906 vport = dev_to_vport(dev);
1907
1908 shost = vport_to_shost(vport);
1909 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1910 != &fc_host_class.class)
1911 return 0;
1912
1913 i = to_fc_internal(shost->transportt);
1914 return &i->vport_attr_cont.ac == cont;
1915 }
1916
1917
1918 /**
1919 * fc_timed_out - FC Transport I/O timeout intercept handler
1920 * @scmd: The SCSI command which timed out
1921 *
1922 * This routine protects against error handlers getting invoked while a
1923 * rport is in a blocked state, typically due to a temporarily loss of
1924 * connectivity. If the error handlers are allowed to proceed, requests
1925 * to abort i/o, reset the target, etc will likely fail as there is no way
1926 * to communicate with the device to perform the requested function. These
1927 * failures may result in the midlayer taking the device offline, requiring
1928 * manual intervention to restore operation.
1929 *
1930 * This routine, called whenever an i/o times out, validates the state of
1931 * the underlying rport. If the rport is blocked, it returns
1932 * EH_RESET_TIMER, which will continue to reschedule the timeout.
1933 * Eventually, either the device will return, or devloss_tmo will fire,
1934 * and when the timeout then fires, it will be handled normally.
1935 * If the rport is not blocked, normal error handling continues.
1936 *
1937 * Notes:
1938 * This routine assumes no locks are held on entry.
1939 */
1940 static enum blk_eh_timer_return
1941 fc_timed_out(struct scsi_cmnd *scmd)
1942 {
1943 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1944
1945 if (rport->port_state == FC_PORTSTATE_BLOCKED)
1946 return BLK_EH_RESET_TIMER;
1947
1948 return BLK_EH_NOT_HANDLED;
1949 }
1950
1951 /*
1952 * Called by fc_user_scan to locate an rport on the shost that
1953 * matches the channel and target id, and invoke scsi_scan_target()
1954 * on the rport.
1955 */
1956 static void
1957 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1958 {
1959 struct fc_rport *rport;
1960 unsigned long flags;
1961
1962 spin_lock_irqsave(shost->host_lock, flags);
1963
1964 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1965 if (rport->scsi_target_id == -1)
1966 continue;
1967
1968 if (rport->port_state != FC_PORTSTATE_ONLINE)
1969 continue;
1970
1971 if ((channel == rport->channel) &&
1972 (id == rport->scsi_target_id)) {
1973 spin_unlock_irqrestore(shost->host_lock, flags);
1974 scsi_scan_target(&rport->dev, channel, id, lun, 1);
1975 return;
1976 }
1977 }
1978
1979 spin_unlock_irqrestore(shost->host_lock, flags);
1980 }
1981
1982 /*
1983 * Called via sysfs scan routines. Necessary, as the FC transport
1984 * wants to place all target objects below the rport object. So this
1985 * routine must invoke the scsi_scan_target() routine with the rport
1986 * object as the parent.
1987 */
1988 static int
1989 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1990 {
1991 uint chlo, chhi;
1992 uint tgtlo, tgthi;
1993
1994 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
1995 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
1996 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1997 return -EINVAL;
1998
1999 if (channel == SCAN_WILD_CARD) {
2000 chlo = 0;
2001 chhi = shost->max_channel + 1;
2002 } else {
2003 chlo = channel;
2004 chhi = channel + 1;
2005 }
2006
2007 if (id == SCAN_WILD_CARD) {
2008 tgtlo = 0;
2009 tgthi = shost->max_id;
2010 } else {
2011 tgtlo = id;
2012 tgthi = id + 1;
2013 }
2014
2015 for ( ; chlo < chhi; chlo++)
2016 for ( ; tgtlo < tgthi; tgtlo++)
2017 fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2018
2019 return 0;
2020 }
2021
2022 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2023 int result)
2024 {
2025 struct fc_internal *i = to_fc_internal(shost->transportt);
2026 return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2027 }
2028
2029 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2030 {
2031 struct fc_internal *i = to_fc_internal(shost->transportt);
2032 return i->f->it_nexus_response(shost, nexus, result);
2033 }
2034
2035 struct scsi_transport_template *
2036 fc_attach_transport(struct fc_function_template *ft)
2037 {
2038 int count;
2039 struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2040 GFP_KERNEL);
2041
2042 if (unlikely(!i))
2043 return NULL;
2044
2045 i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2046 i->t.target_attrs.ac.class = &fc_transport_class.class;
2047 i->t.target_attrs.ac.match = fc_target_match;
2048 i->t.target_size = sizeof(struct fc_starget_attrs);
2049 transport_container_register(&i->t.target_attrs);
2050
2051 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2052 i->t.host_attrs.ac.class = &fc_host_class.class;
2053 i->t.host_attrs.ac.match = fc_host_match;
2054 i->t.host_size = sizeof(struct fc_host_attrs);
2055 if (ft->get_fc_host_stats)
2056 i->t.host_attrs.statistics = &fc_statistics_group;
2057 transport_container_register(&i->t.host_attrs);
2058
2059 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2060 i->rport_attr_cont.ac.class = &fc_rport_class.class;
2061 i->rport_attr_cont.ac.match = fc_rport_match;
2062 transport_container_register(&i->rport_attr_cont);
2063
2064 i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2065 i->vport_attr_cont.ac.class = &fc_vport_class.class;
2066 i->vport_attr_cont.ac.match = fc_vport_match;
2067 transport_container_register(&i->vport_attr_cont);
2068
2069 i->f = ft;
2070
2071 /* Transport uses the shost workq for scsi scanning */
2072 i->t.create_work_queue = 1;
2073
2074 i->t.eh_timed_out = fc_timed_out;
2075
2076 i->t.user_scan = fc_user_scan;
2077
2078 /* target-mode drivers' functions */
2079 i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2080 i->t.it_nexus_response = fc_it_nexus_response;
2081
2082 /*
2083 * Setup SCSI Target Attributes.
2084 */
2085 count = 0;
2086 SETUP_STARGET_ATTRIBUTE_RD(node_name);
2087 SETUP_STARGET_ATTRIBUTE_RD(port_name);
2088 SETUP_STARGET_ATTRIBUTE_RD(port_id);
2089
2090 BUG_ON(count > FC_STARGET_NUM_ATTRS);
2091
2092 i->starget_attrs[count] = NULL;
2093
2094
2095 /*
2096 * Setup SCSI Host Attributes.
2097 */
2098 count=0;
2099 SETUP_HOST_ATTRIBUTE_RD(node_name);
2100 SETUP_HOST_ATTRIBUTE_RD(port_name);
2101 SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2102 SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2103 SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2104 SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2105 SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2106 if (ft->vport_create) {
2107 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2108 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2109 }
2110 SETUP_HOST_ATTRIBUTE_RD(serial_number);
2111
2112 SETUP_HOST_ATTRIBUTE_RD(port_id);
2113 SETUP_HOST_ATTRIBUTE_RD(port_type);
2114 SETUP_HOST_ATTRIBUTE_RD(port_state);
2115 SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2116 SETUP_HOST_ATTRIBUTE_RD(speed);
2117 SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2118 SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2119 SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2120
2121 /* Transport-managed attributes */
2122 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2123 if (ft->issue_fc_host_lip)
2124 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2125 if (ft->vport_create)
2126 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2127 if (ft->vport_delete)
2128 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2129
2130 BUG_ON(count > FC_HOST_NUM_ATTRS);
2131
2132 i->host_attrs[count] = NULL;
2133
2134 /*
2135 * Setup Remote Port Attributes.
2136 */
2137 count=0;
2138 SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2139 SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2140 SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2141 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2142 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2143 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2144 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2145 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2146 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2147 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2148
2149 BUG_ON(count > FC_RPORT_NUM_ATTRS);
2150
2151 i->rport_attrs[count] = NULL;
2152
2153 /*
2154 * Setup Virtual Port Attributes.
2155 */
2156 count=0;
2157 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2158 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2159 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2160 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2161 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2162 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2163 SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2164 SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2165 SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2166
2167 BUG_ON(count > FC_VPORT_NUM_ATTRS);
2168
2169 i->vport_attrs[count] = NULL;
2170
2171 return &i->t;
2172 }
2173 EXPORT_SYMBOL(fc_attach_transport);
2174
2175 void fc_release_transport(struct scsi_transport_template *t)
2176 {
2177 struct fc_internal *i = to_fc_internal(t);
2178
2179 transport_container_unregister(&i->t.target_attrs);
2180 transport_container_unregister(&i->t.host_attrs);
2181 transport_container_unregister(&i->rport_attr_cont);
2182 transport_container_unregister(&i->vport_attr_cont);
2183
2184 kfree(i);
2185 }
2186 EXPORT_SYMBOL(fc_release_transport);
2187
2188 /**
2189 * fc_queue_work - Queue work to the fc_host workqueue.
2190 * @shost: Pointer to Scsi_Host bound to fc_host.
2191 * @work: Work to queue for execution.
2192 *
2193 * Return value:
2194 * 1 - work queued for execution
2195 * 0 - work is already queued
2196 * -EINVAL - work queue doesn't exist
2197 */
2198 static int
2199 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2200 {
2201 if (unlikely(!fc_host_work_q(shost))) {
2202 printk(KERN_ERR
2203 "ERROR: FC host '%s' attempted to queue work, "
2204 "when no workqueue created.\n", shost->hostt->name);
2205 dump_stack();
2206
2207 return -EINVAL;
2208 }
2209
2210 return queue_work(fc_host_work_q(shost), work);
2211 }
2212
2213 /**
2214 * fc_flush_work - Flush a fc_host's workqueue.
2215 * @shost: Pointer to Scsi_Host bound to fc_host.
2216 */
2217 static void
2218 fc_flush_work(struct Scsi_Host *shost)
2219 {
2220 if (!fc_host_work_q(shost)) {
2221 printk(KERN_ERR
2222 "ERROR: FC host '%s' attempted to flush work, "
2223 "when no workqueue created.\n", shost->hostt->name);
2224 dump_stack();
2225 return;
2226 }
2227
2228 flush_workqueue(fc_host_work_q(shost));
2229 }
2230
2231 /**
2232 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2233 * @shost: Pointer to Scsi_Host bound to fc_host.
2234 * @work: Work to queue for execution.
2235 * @delay: jiffies to delay the work queuing
2236 *
2237 * Return value:
2238 * 1 on success / 0 already queued / < 0 for error
2239 */
2240 static int
2241 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2242 unsigned long delay)
2243 {
2244 if (unlikely(!fc_host_devloss_work_q(shost))) {
2245 printk(KERN_ERR
2246 "ERROR: FC host '%s' attempted to queue work, "
2247 "when no workqueue created.\n", shost->hostt->name);
2248 dump_stack();
2249
2250 return -EINVAL;
2251 }
2252
2253 return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2254 }
2255
2256 /**
2257 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2258 * @shost: Pointer to Scsi_Host bound to fc_host.
2259 */
2260 static void
2261 fc_flush_devloss(struct Scsi_Host *shost)
2262 {
2263 if (!fc_host_devloss_work_q(shost)) {
2264 printk(KERN_ERR
2265 "ERROR: FC host '%s' attempted to flush work, "
2266 "when no workqueue created.\n", shost->hostt->name);
2267 dump_stack();
2268 return;
2269 }
2270
2271 flush_workqueue(fc_host_devloss_work_q(shost));
2272 }
2273
2274
2275 /**
2276 * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2277 * @shost: Which &Scsi_Host
2278 *
2279 * This routine is expected to be called immediately preceeding the
2280 * a driver's call to scsi_remove_host().
2281 *
2282 * WARNING: A driver utilizing the fc_transport, which fails to call
2283 * this routine prior to scsi_remove_host(), will leave dangling
2284 * objects in /sys/class/fc_remote_ports. Access to any of these
2285 * objects can result in a system crash !!!
2286 *
2287 * Notes:
2288 * This routine assumes no locks are held on entry.
2289 */
2290 void
2291 fc_remove_host(struct Scsi_Host *shost)
2292 {
2293 struct fc_vport *vport = NULL, *next_vport = NULL;
2294 struct fc_rport *rport = NULL, *next_rport = NULL;
2295 struct workqueue_struct *work_q;
2296 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2297 unsigned long flags;
2298
2299 spin_lock_irqsave(shost->host_lock, flags);
2300
2301 /* Remove any vports */
2302 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2303 fc_queue_work(shost, &vport->vport_delete_work);
2304
2305 /* Remove any remote ports */
2306 list_for_each_entry_safe(rport, next_rport,
2307 &fc_host->rports, peers) {
2308 list_del(&rport->peers);
2309 rport->port_state = FC_PORTSTATE_DELETED;
2310 fc_queue_work(shost, &rport->rport_delete_work);
2311 }
2312
2313 list_for_each_entry_safe(rport, next_rport,
2314 &fc_host->rport_bindings, peers) {
2315 list_del(&rport->peers);
2316 rport->port_state = FC_PORTSTATE_DELETED;
2317 fc_queue_work(shost, &rport->rport_delete_work);
2318 }
2319
2320 spin_unlock_irqrestore(shost->host_lock, flags);
2321
2322 /* flush all scan work items */
2323 scsi_flush_work(shost);
2324
2325 /* flush all stgt delete, and rport delete work items, then kill it */
2326 if (fc_host->work_q) {
2327 work_q = fc_host->work_q;
2328 fc_host->work_q = NULL;
2329 destroy_workqueue(work_q);
2330 }
2331
2332 /* flush all devloss work items, then kill it */
2333 if (fc_host->devloss_work_q) {
2334 work_q = fc_host->devloss_work_q;
2335 fc_host->devloss_work_q = NULL;
2336 destroy_workqueue(work_q);
2337 }
2338 }
2339 EXPORT_SYMBOL(fc_remove_host);
2340
2341 static void fc_terminate_rport_io(struct fc_rport *rport)
2342 {
2343 struct Scsi_Host *shost = rport_to_shost(rport);
2344 struct fc_internal *i = to_fc_internal(shost->transportt);
2345
2346 /* Involve the LLDD if possible to terminate all io on the rport. */
2347 if (i->f->terminate_rport_io)
2348 i->f->terminate_rport_io(rport);
2349
2350 /*
2351 * must unblock to flush queued IO. The caller will have set
2352 * the port_state or flags, so that fc_remote_port_chkready will
2353 * fail IO.
2354 */
2355 scsi_target_unblock(&rport->dev);
2356 }
2357
2358 /**
2359 * fc_starget_delete - called to delete the scsi decendents of an rport
2360 * @work: remote port to be operated on.
2361 *
2362 * Deletes target and all sdevs.
2363 */
2364 static void
2365 fc_starget_delete(struct work_struct *work)
2366 {
2367 struct fc_rport *rport =
2368 container_of(work, struct fc_rport, stgt_delete_work);
2369
2370 fc_terminate_rport_io(rport);
2371 scsi_remove_target(&rport->dev);
2372 }
2373
2374
2375 /**
2376 * fc_rport_final_delete - finish rport termination and delete it.
2377 * @work: remote port to be deleted.
2378 */
2379 static void
2380 fc_rport_final_delete(struct work_struct *work)
2381 {
2382 struct fc_rport *rport =
2383 container_of(work, struct fc_rport, rport_delete_work);
2384 struct device *dev = &rport->dev;
2385 struct Scsi_Host *shost = rport_to_shost(rport);
2386 struct fc_internal *i = to_fc_internal(shost->transportt);
2387 unsigned long flags;
2388 int do_callback = 0;
2389
2390 /*
2391 * if a scan is pending, flush the SCSI Host work_q so that
2392 * that we can reclaim the rport scan work element.
2393 */
2394 if (rport->flags & FC_RPORT_SCAN_PENDING)
2395 scsi_flush_work(shost);
2396
2397 fc_terminate_rport_io(rport);
2398
2399 /*
2400 * Cancel any outstanding timers. These should really exist
2401 * only when rmmod'ing the LLDD and we're asking for
2402 * immediate termination of the rports
2403 */
2404 spin_lock_irqsave(shost->host_lock, flags);
2405 if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2406 spin_unlock_irqrestore(shost->host_lock, flags);
2407 if (!cancel_delayed_work(&rport->fail_io_work))
2408 fc_flush_devloss(shost);
2409 if (!cancel_delayed_work(&rport->dev_loss_work))
2410 fc_flush_devloss(shost);
2411 spin_lock_irqsave(shost->host_lock, flags);
2412 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2413 }
2414 spin_unlock_irqrestore(shost->host_lock, flags);
2415
2416 /* Delete SCSI target and sdevs */
2417 if (rport->scsi_target_id != -1)
2418 fc_starget_delete(&rport->stgt_delete_work);
2419
2420 /*
2421 * Notify the driver that the rport is now dead. The LLDD will
2422 * also guarantee that any communication to the rport is terminated
2423 *
2424 * Avoid this call if we already called it when we preserved the
2425 * rport for the binding.
2426 */
2427 spin_lock_irqsave(shost->host_lock, flags);
2428 if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2429 (i->f->dev_loss_tmo_callbk)) {
2430 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2431 do_callback = 1;
2432 }
2433 spin_unlock_irqrestore(shost->host_lock, flags);
2434
2435 if (do_callback)
2436 i->f->dev_loss_tmo_callbk(rport);
2437
2438 fc_bsg_remove(rport->rqst_q);
2439
2440 transport_remove_device(dev);
2441 device_del(dev);
2442 transport_destroy_device(dev);
2443 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2444 put_device(dev); /* for self-reference */
2445 }
2446
2447
2448 /**
2449 * fc_rport_create - allocates and creates a remote FC port.
2450 * @shost: scsi host the remote port is connected to.
2451 * @channel: Channel on shost port connected to.
2452 * @ids: The world wide names, fc address, and FC4 port
2453 * roles for the remote port.
2454 *
2455 * Allocates and creates the remoter port structure, including the
2456 * class and sysfs creation.
2457 *
2458 * Notes:
2459 * This routine assumes no locks are held on entry.
2460 */
2461 static struct fc_rport *
2462 fc_rport_create(struct Scsi_Host *shost, int channel,
2463 struct fc_rport_identifiers *ids)
2464 {
2465 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2466 struct fc_internal *fci = to_fc_internal(shost->transportt);
2467 struct fc_rport *rport;
2468 struct device *dev;
2469 unsigned long flags;
2470 int error;
2471 size_t size;
2472
2473 size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2474 rport = kzalloc(size, GFP_KERNEL);
2475 if (unlikely(!rport)) {
2476 printk(KERN_ERR "%s: allocation failure\n", __func__);
2477 return NULL;
2478 }
2479
2480 rport->maxframe_size = -1;
2481 rport->supported_classes = FC_COS_UNSPECIFIED;
2482 rport->dev_loss_tmo = fc_dev_loss_tmo;
2483 memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2484 memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2485 rport->port_id = ids->port_id;
2486 rport->roles = ids->roles;
2487 rport->port_state = FC_PORTSTATE_ONLINE;
2488 if (fci->f->dd_fcrport_size)
2489 rport->dd_data = &rport[1];
2490 rport->channel = channel;
2491 rport->fast_io_fail_tmo = -1;
2492
2493 INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2494 INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2495 INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2496 INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2497 INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2498
2499 spin_lock_irqsave(shost->host_lock, flags);
2500
2501 rport->number = fc_host->next_rport_number++;
2502 if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2503 rport->scsi_target_id = fc_host->next_target_id++;
2504 else
2505 rport->scsi_target_id = -1;
2506 list_add_tail(&rport->peers, &fc_host->rports);
2507 get_device(&shost->shost_gendev); /* for fc_host->rport list */
2508
2509 spin_unlock_irqrestore(shost->host_lock, flags);
2510
2511 dev = &rport->dev;
2512 device_initialize(dev); /* takes self reference */
2513 dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2514 dev->release = fc_rport_dev_release;
2515 dev_set_name(dev, "rport-%d:%d-%d",
2516 shost->host_no, channel, rport->number);
2517 transport_setup_device(dev);
2518
2519 error = device_add(dev);
2520 if (error) {
2521 printk(KERN_ERR "FC Remote Port device_add failed\n");
2522 goto delete_rport;
2523 }
2524 transport_add_device(dev);
2525 transport_configure_device(dev);
2526
2527 fc_bsg_rportadd(shost, rport);
2528 /* ignore any bsg add error - we just can't do sgio */
2529
2530 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2531 /* initiate a scan of the target */
2532 rport->flags |= FC_RPORT_SCAN_PENDING;
2533 scsi_queue_work(shost, &rport->scan_work);
2534 }
2535
2536 return rport;
2537
2538 delete_rport:
2539 transport_destroy_device(dev);
2540 spin_lock_irqsave(shost->host_lock, flags);
2541 list_del(&rport->peers);
2542 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2543 spin_unlock_irqrestore(shost->host_lock, flags);
2544 put_device(dev->parent);
2545 kfree(rport);
2546 return NULL;
2547 }
2548
2549 /**
2550 * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2551 * @shost: scsi host the remote port is connected to.
2552 * @channel: Channel on shost port connected to.
2553 * @ids: The world wide names, fc address, and FC4 port
2554 * roles for the remote port.
2555 *
2556 * The LLDD calls this routine to notify the transport of the existence
2557 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2558 * of the port, it's FC address (port_id), and the FC4 roles that are
2559 * active for the port.
2560 *
2561 * For ports that are FCP targets (aka scsi targets), the FC transport
2562 * maintains consistent target id bindings on behalf of the LLDD.
2563 * A consistent target id binding is an assignment of a target id to
2564 * a remote port identifier, which persists while the scsi host is
2565 * attached. The remote port can disappear, then later reappear, and
2566 * it's target id assignment remains the same. This allows for shifts
2567 * in FC addressing (if binding by wwpn or wwnn) with no apparent
2568 * changes to the scsi subsystem which is based on scsi host number and
2569 * target id values. Bindings are only valid during the attachment of
2570 * the scsi host. If the host detaches, then later re-attaches, target
2571 * id bindings may change.
2572 *
2573 * This routine is responsible for returning a remote port structure.
2574 * The routine will search the list of remote ports it maintains
2575 * internally on behalf of consistent target id mappings. If found, the
2576 * remote port structure will be reused. Otherwise, a new remote port
2577 * structure will be allocated.
2578 *
2579 * Whenever a remote port is allocated, a new fc_remote_port class
2580 * device is created.
2581 *
2582 * Should not be called from interrupt context.
2583 *
2584 * Notes:
2585 * This routine assumes no locks are held on entry.
2586 */
2587 struct fc_rport *
2588 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2589 struct fc_rport_identifiers *ids)
2590 {
2591 struct fc_internal *fci = to_fc_internal(shost->transportt);
2592 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2593 struct fc_rport *rport;
2594 unsigned long flags;
2595 int match = 0;
2596
2597 /* ensure any stgt delete functions are done */
2598 fc_flush_work(shost);
2599
2600 /*
2601 * Search the list of "active" rports, for an rport that has been
2602 * deleted, but we've held off the real delete while the target
2603 * is in a "blocked" state.
2604 */
2605 spin_lock_irqsave(shost->host_lock, flags);
2606
2607 list_for_each_entry(rport, &fc_host->rports, peers) {
2608
2609 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2610 (rport->channel == channel)) {
2611
2612 switch (fc_host->tgtid_bind_type) {
2613 case FC_TGTID_BIND_BY_WWPN:
2614 case FC_TGTID_BIND_NONE:
2615 if (rport->port_name == ids->port_name)
2616 match = 1;
2617 break;
2618 case FC_TGTID_BIND_BY_WWNN:
2619 if (rport->node_name == ids->node_name)
2620 match = 1;
2621 break;
2622 case FC_TGTID_BIND_BY_ID:
2623 if (rport->port_id == ids->port_id)
2624 match = 1;
2625 break;
2626 }
2627
2628 if (match) {
2629
2630 memcpy(&rport->node_name, &ids->node_name,
2631 sizeof(rport->node_name));
2632 memcpy(&rport->port_name, &ids->port_name,
2633 sizeof(rport->port_name));
2634 rport->port_id = ids->port_id;
2635
2636 rport->port_state = FC_PORTSTATE_ONLINE;
2637 rport->roles = ids->roles;
2638
2639 spin_unlock_irqrestore(shost->host_lock, flags);
2640
2641 if (fci->f->dd_fcrport_size)
2642 memset(rport->dd_data, 0,
2643 fci->f->dd_fcrport_size);
2644
2645 /*
2646 * If we were not a target, cancel the
2647 * io terminate and rport timers, and
2648 * we're done.
2649 *
2650 * If we were a target, but our new role
2651 * doesn't indicate a target, leave the
2652 * timers running expecting the role to
2653 * change as the target fully logs in. If
2654 * it doesn't, the target will be torn down.
2655 *
2656 * If we were a target, and our role shows
2657 * we're still a target, cancel the timers
2658 * and kick off a scan.
2659 */
2660
2661 /* was a target, not in roles */
2662 if ((rport->scsi_target_id != -1) &&
2663 (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2664 return rport;
2665
2666 /*
2667 * Stop the fail io and dev_loss timers.
2668 * If they flush, the port_state will
2669 * be checked and will NOOP the function.
2670 */
2671 if (!cancel_delayed_work(&rport->fail_io_work))
2672 fc_flush_devloss(shost);
2673 if (!cancel_delayed_work(&rport->dev_loss_work))
2674 fc_flush_devloss(shost);
2675
2676 spin_lock_irqsave(shost->host_lock, flags);
2677
2678 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2679 FC_RPORT_DEVLOSS_PENDING |
2680 FC_RPORT_DEVLOSS_CALLBK_DONE);
2681
2682 /* if target, initiate a scan */
2683 if (rport->scsi_target_id != -1) {
2684 rport->flags |= FC_RPORT_SCAN_PENDING;
2685 scsi_queue_work(shost,
2686 &rport->scan_work);
2687 spin_unlock_irqrestore(shost->host_lock,
2688 flags);
2689 scsi_target_unblock(&rport->dev);
2690 } else
2691 spin_unlock_irqrestore(shost->host_lock,
2692 flags);
2693
2694 fc_bsg_goose_queue(rport);
2695
2696 return rport;
2697 }
2698 }
2699 }
2700
2701 /*
2702 * Search the bindings array
2703 * Note: if never a FCP target, you won't be on this list
2704 */
2705 if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2706
2707 /* search for a matching consistent binding */
2708
2709 list_for_each_entry(rport, &fc_host->rport_bindings,
2710 peers) {
2711 if (rport->channel != channel)
2712 continue;
2713
2714 switch (fc_host->tgtid_bind_type) {
2715 case FC_TGTID_BIND_BY_WWPN:
2716 if (rport->port_name == ids->port_name)
2717 match = 1;
2718 break;
2719 case FC_TGTID_BIND_BY_WWNN:
2720 if (rport->node_name == ids->node_name)
2721 match = 1;
2722 break;
2723 case FC_TGTID_BIND_BY_ID:
2724 if (rport->port_id == ids->port_id)
2725 match = 1;
2726 break;
2727 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2728 break;
2729 }
2730
2731 if (match) {
2732 list_move_tail(&rport->peers, &fc_host->rports);
2733 break;
2734 }
2735 }
2736
2737 if (match) {
2738 memcpy(&rport->node_name, &ids->node_name,
2739 sizeof(rport->node_name));
2740 memcpy(&rport->port_name, &ids->port_name,
2741 sizeof(rport->port_name));
2742 rport->port_id = ids->port_id;
2743 rport->roles = ids->roles;
2744 rport->port_state = FC_PORTSTATE_ONLINE;
2745 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2746
2747 if (fci->f->dd_fcrport_size)
2748 memset(rport->dd_data, 0,
2749 fci->f->dd_fcrport_size);
2750
2751 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2752 /* initiate a scan of the target */
2753 rport->flags |= FC_RPORT_SCAN_PENDING;
2754 scsi_queue_work(shost, &rport->scan_work);
2755 spin_unlock_irqrestore(shost->host_lock, flags);
2756 scsi_target_unblock(&rport->dev);
2757 } else
2758 spin_unlock_irqrestore(shost->host_lock, flags);
2759
2760 return rport;
2761 }
2762 }
2763
2764 spin_unlock_irqrestore(shost->host_lock, flags);
2765
2766 /* No consistent binding found - create new remote port entry */
2767 rport = fc_rport_create(shost, channel, ids);
2768
2769 return rport;
2770 }
2771 EXPORT_SYMBOL(fc_remote_port_add);
2772
2773
2774 /**
2775 * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2776 * @rport: The remote port that no longer exists
2777 *
2778 * The LLDD calls this routine to notify the transport that a remote
2779 * port is no longer part of the topology. Note: Although a port
2780 * may no longer be part of the topology, it may persist in the remote
2781 * ports displayed by the fc_host. We do this under 2 conditions:
2782 * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2783 * This allows the port to temporarily disappear, then reappear without
2784 * disrupting the SCSI device tree attached to it. During the "blocked"
2785 * period the port will still exist.
2786 * 2) If the port was a scsi target and disappears for longer than we
2787 * expect, we'll delete the port and the tear down the SCSI device tree
2788 * attached to it. However, we want to semi-persist the target id assigned
2789 * to that port if it eventually does exist. The port structure will
2790 * remain (although with minimal information) so that the target id
2791 * bindings remails.
2792 *
2793 * If the remote port is not an FCP Target, it will be fully torn down
2794 * and deallocated, including the fc_remote_port class device.
2795 *
2796 * If the remote port is an FCP Target, the port will be placed in a
2797 * temporary blocked state. From the LLDD's perspective, the rport no
2798 * longer exists. From the SCSI midlayer's perspective, the SCSI target
2799 * exists, but all sdevs on it are blocked from further I/O. The following
2800 * is then expected.
2801 *
2802 * If the remote port does not return (signaled by a LLDD call to
2803 * fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2804 * scsi target is removed - killing all outstanding i/o and removing the
2805 * scsi devices attached ot it. The port structure will be marked Not
2806 * Present and be partially cleared, leaving only enough information to
2807 * recognize the remote port relative to the scsi target id binding if
2808 * it later appears. The port will remain as long as there is a valid
2809 * binding (e.g. until the user changes the binding type or unloads the
2810 * scsi host with the binding).
2811 *
2812 * If the remote port returns within the dev_loss_tmo value (and matches
2813 * according to the target id binding type), the port structure will be
2814 * reused. If it is no longer a SCSI target, the target will be torn
2815 * down. If it continues to be a SCSI target, then the target will be
2816 * unblocked (allowing i/o to be resumed), and a scan will be activated
2817 * to ensure that all luns are detected.
2818 *
2819 * Called from normal process context only - cannot be called from interrupt.
2820 *
2821 * Notes:
2822 * This routine assumes no locks are held on entry.
2823 */
2824 void
2825 fc_remote_port_delete(struct fc_rport *rport)
2826 {
2827 struct Scsi_Host *shost = rport_to_shost(rport);
2828 int timeout = rport->dev_loss_tmo;
2829 unsigned long flags;
2830
2831 /*
2832 * No need to flush the fc_host work_q's, as all adds are synchronous.
2833 *
2834 * We do need to reclaim the rport scan work element, so eventually
2835 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2836 * there's still a scan pending.
2837 */
2838
2839 spin_lock_irqsave(shost->host_lock, flags);
2840
2841 if (rport->port_state != FC_PORTSTATE_ONLINE) {
2842 spin_unlock_irqrestore(shost->host_lock, flags);
2843 return;
2844 }
2845
2846 /*
2847 * In the past, we if this was not an FCP-Target, we would
2848 * unconditionally just jump to deleting the rport.
2849 * However, rports can be used as node containers by the LLDD,
2850 * and its not appropriate to just terminate the rport at the
2851 * first sign of a loss in connectivity. The LLDD may want to
2852 * send ELS traffic to re-validate the login. If the rport is
2853 * immediately deleted, it makes it inappropriate for a node
2854 * container.
2855 * So... we now unconditionally wait dev_loss_tmo before
2856 * destroying an rport.
2857 */
2858
2859 rport->port_state = FC_PORTSTATE_BLOCKED;
2860
2861 rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2862
2863 spin_unlock_irqrestore(shost->host_lock, flags);
2864
2865 if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2866 shost->active_mode & MODE_TARGET)
2867 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2868
2869 scsi_target_block(&rport->dev);
2870
2871 /* see if we need to kill io faster than waiting for device loss */
2872 if ((rport->fast_io_fail_tmo != -1) &&
2873 (rport->fast_io_fail_tmo < timeout))
2874 fc_queue_devloss_work(shost, &rport->fail_io_work,
2875 rport->fast_io_fail_tmo * HZ);
2876
2877 /* cap the length the devices can be blocked until they are deleted */
2878 fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2879 }
2880 EXPORT_SYMBOL(fc_remote_port_delete);
2881
2882 /**
2883 * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
2884 * @rport: The remote port that changed.
2885 * @roles: New roles for this port.
2886 *
2887 * Description: The LLDD calls this routine to notify the transport that the
2888 * roles on a remote port may have changed. The largest effect of this is
2889 * if a port now becomes a FCP Target, it must be allocated a
2890 * scsi target id. If the port is no longer a FCP target, any
2891 * scsi target id value assigned to it will persist in case the
2892 * role changes back to include FCP Target. No changes in the scsi
2893 * midlayer will be invoked if the role changes (in the expectation
2894 * that the role will be resumed. If it doesn't normal error processing
2895 * will take place).
2896 *
2897 * Should not be called from interrupt context.
2898 *
2899 * Notes:
2900 * This routine assumes no locks are held on entry.
2901 */
2902 void
2903 fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
2904 {
2905 struct Scsi_Host *shost = rport_to_shost(rport);
2906 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2907 unsigned long flags;
2908 int create = 0;
2909 int ret;
2910
2911 spin_lock_irqsave(shost->host_lock, flags);
2912 if (roles & FC_PORT_ROLE_FCP_TARGET) {
2913 if (rport->scsi_target_id == -1) {
2914 rport->scsi_target_id = fc_host->next_target_id++;
2915 create = 1;
2916 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
2917 create = 1;
2918 } else if (shost->active_mode & MODE_TARGET) {
2919 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
2920 (char *)&rport->node_name);
2921 if (ret)
2922 printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
2923 ret);
2924 }
2925
2926 rport->roles = roles;
2927
2928 spin_unlock_irqrestore(shost->host_lock, flags);
2929
2930 if (create) {
2931 /*
2932 * There may have been a delete timer running on the
2933 * port. Ensure that it is cancelled as we now know
2934 * the port is an FCP Target.
2935 * Note: we know the rport is exists and in an online
2936 * state as the LLDD would not have had an rport
2937 * reference to pass us.
2938 *
2939 * Take no action on the del_timer failure as the state
2940 * machine state change will validate the
2941 * transaction.
2942 */
2943 if (!cancel_delayed_work(&rport->fail_io_work))
2944 fc_flush_devloss(shost);
2945 if (!cancel_delayed_work(&rport->dev_loss_work))
2946 fc_flush_devloss(shost);
2947
2948 spin_lock_irqsave(shost->host_lock, flags);
2949 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2950 FC_RPORT_DEVLOSS_PENDING);
2951 spin_unlock_irqrestore(shost->host_lock, flags);
2952
2953 /* ensure any stgt delete functions are done */
2954 fc_flush_work(shost);
2955
2956 /* initiate a scan of the target */
2957 spin_lock_irqsave(shost->host_lock, flags);
2958 rport->flags |= FC_RPORT_SCAN_PENDING;
2959 scsi_queue_work(shost, &rport->scan_work);
2960 spin_unlock_irqrestore(shost->host_lock, flags);
2961 scsi_target_unblock(&rport->dev);
2962 }
2963 }
2964 EXPORT_SYMBOL(fc_remote_port_rolechg);
2965
2966 /**
2967 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
2968 * @work: rport target that failed to reappear in the allotted time.
2969 *
2970 * Description: An attempt to delete a remote port blocks, and if it fails
2971 * to return in the allotted time this gets called.
2972 */
2973 static void
2974 fc_timeout_deleted_rport(struct work_struct *work)
2975 {
2976 struct fc_rport *rport =
2977 container_of(work, struct fc_rport, dev_loss_work.work);
2978 struct Scsi_Host *shost = rport_to_shost(rport);
2979 struct fc_internal *i = to_fc_internal(shost->transportt);
2980 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2981 unsigned long flags;
2982 int do_callback = 0;
2983
2984 spin_lock_irqsave(shost->host_lock, flags);
2985
2986 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2987
2988 /*
2989 * If the port is ONLINE, then it came back. If it was a SCSI
2990 * target, validate it still is. If not, tear down the
2991 * scsi_target on it.
2992 */
2993 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
2994 (rport->scsi_target_id != -1) &&
2995 !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
2996 dev_printk(KERN_ERR, &rport->dev,
2997 "blocked FC remote port time out: no longer"
2998 " a FCP target, removing starget\n");
2999 spin_unlock_irqrestore(shost->host_lock, flags);
3000 scsi_target_unblock(&rport->dev);
3001 fc_queue_work(shost, &rport->stgt_delete_work);
3002 return;
3003 }
3004
3005 /* NOOP state - we're flushing workq's */
3006 if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3007 spin_unlock_irqrestore(shost->host_lock, flags);
3008 dev_printk(KERN_ERR, &rport->dev,
3009 "blocked FC remote port time out: leaving"
3010 " rport%s alone\n",
3011 (rport->scsi_target_id != -1) ? " and starget" : "");
3012 return;
3013 }
3014
3015 if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3016 (rport->scsi_target_id == -1)) {
3017 list_del(&rport->peers);
3018 rport->port_state = FC_PORTSTATE_DELETED;
3019 dev_printk(KERN_ERR, &rport->dev,
3020 "blocked FC remote port time out: removing"
3021 " rport%s\n",
3022 (rport->scsi_target_id != -1) ? " and starget" : "");
3023 fc_queue_work(shost, &rport->rport_delete_work);
3024 spin_unlock_irqrestore(shost->host_lock, flags);
3025 return;
3026 }
3027
3028 dev_printk(KERN_ERR, &rport->dev,
3029 "blocked FC remote port time out: removing target and "
3030 "saving binding\n");
3031
3032 list_move_tail(&rport->peers, &fc_host->rport_bindings);
3033
3034 /*
3035 * Note: We do not remove or clear the hostdata area. This allows
3036 * host-specific target data to persist along with the
3037 * scsi_target_id. It's up to the host to manage it's hostdata area.
3038 */
3039
3040 /*
3041 * Reinitialize port attributes that may change if the port comes back.
3042 */
3043 rport->maxframe_size = -1;
3044 rport->supported_classes = FC_COS_UNSPECIFIED;
3045 rport->roles = FC_PORT_ROLE_UNKNOWN;
3046 rport->port_state = FC_PORTSTATE_NOTPRESENT;
3047 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3048
3049 /*
3050 * Pre-emptively kill I/O rather than waiting for the work queue
3051 * item to teardown the starget. (FCOE libFC folks prefer this
3052 * and to have the rport_port_id still set when it's done).
3053 */
3054 spin_unlock_irqrestore(shost->host_lock, flags);
3055 fc_terminate_rport_io(rport);
3056
3057 spin_lock_irqsave(shost->host_lock, flags);
3058
3059 if (rport->port_state == FC_PORTSTATE_NOTPRESENT) { /* still missing */
3060
3061 /* remove the identifiers that aren't used in the consisting binding */
3062 switch (fc_host->tgtid_bind_type) {
3063 case FC_TGTID_BIND_BY_WWPN:
3064 rport->node_name = -1;
3065 rport->port_id = -1;
3066 break;
3067 case FC_TGTID_BIND_BY_WWNN:
3068 rport->port_name = -1;
3069 rport->port_id = -1;
3070 break;
3071 case FC_TGTID_BIND_BY_ID:
3072 rport->node_name = -1;
3073 rport->port_name = -1;
3074 break;
3075 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3076 break;
3077 }
3078
3079 /*
3080 * As this only occurs if the remote port (scsi target)
3081 * went away and didn't come back - we'll remove
3082 * all attached scsi devices.
3083 */
3084 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3085 fc_queue_work(shost, &rport->stgt_delete_work);
3086
3087 do_callback = 1;
3088 }
3089
3090 spin_unlock_irqrestore(shost->host_lock, flags);
3091
3092 /*
3093 * Notify the driver that the rport is now dead. The LLDD will
3094 * also guarantee that any communication to the rport is terminated
3095 *
3096 * Note: we set the CALLBK_DONE flag above to correspond
3097 */
3098 if (do_callback && i->f->dev_loss_tmo_callbk)
3099 i->f->dev_loss_tmo_callbk(rport);
3100 }
3101
3102
3103 /**
3104 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3105 * @work: rport to terminate io on.
3106 *
3107 * Notes: Only requests the failure of the io, not that all are flushed
3108 * prior to returning.
3109 */
3110 static void
3111 fc_timeout_fail_rport_io(struct work_struct *work)
3112 {
3113 struct fc_rport *rport =
3114 container_of(work, struct fc_rport, fail_io_work.work);
3115
3116 if (rport->port_state != FC_PORTSTATE_BLOCKED)
3117 return;
3118
3119 rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3120 fc_terminate_rport_io(rport);
3121 }
3122
3123 /**
3124 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3125 * @work: remote port to be scanned.
3126 */
3127 static void
3128 fc_scsi_scan_rport(struct work_struct *work)
3129 {
3130 struct fc_rport *rport =
3131 container_of(work, struct fc_rport, scan_work);
3132 struct Scsi_Host *shost = rport_to_shost(rport);
3133 struct fc_internal *i = to_fc_internal(shost->transportt);
3134 unsigned long flags;
3135
3136 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3137 (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3138 !(i->f->disable_target_scan)) {
3139 scsi_scan_target(&rport->dev, rport->channel,
3140 rport->scsi_target_id, SCAN_WILD_CARD, 1);
3141 }
3142
3143 spin_lock_irqsave(shost->host_lock, flags);
3144 rport->flags &= ~FC_RPORT_SCAN_PENDING;
3145 spin_unlock_irqrestore(shost->host_lock, flags);
3146 }
3147
3148 /**
3149 * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3150 * @cmnd: SCSI command that scsi_eh is trying to recover
3151 *
3152 * This routine can be called from a FC LLD scsi_eh callback. It
3153 * blocks the scsi_eh thread until the fc_rport leaves the
3154 * FC_PORTSTATE_BLOCKED. This is necessary to avoid the scsi_eh
3155 * failing recovery actions for blocked rports which would lead to
3156 * offlined SCSI devices.
3157 */
3158 void fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3159 {
3160 struct Scsi_Host *shost = cmnd->device->host;
3161 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3162 unsigned long flags;
3163
3164 spin_lock_irqsave(shost->host_lock, flags);
3165 while (rport->port_state == FC_PORTSTATE_BLOCKED) {
3166 spin_unlock_irqrestore(shost->host_lock, flags);
3167 msleep(1000);
3168 spin_lock_irqsave(shost->host_lock, flags);
3169 }
3170 spin_unlock_irqrestore(shost->host_lock, flags);
3171 }
3172 EXPORT_SYMBOL(fc_block_scsi_eh);
3173
3174 /**
3175 * fc_vport_setup - allocates and creates a FC virtual port.
3176 * @shost: scsi host the virtual port is connected to.
3177 * @channel: Channel on shost port connected to.
3178 * @pdev: parent device for vport
3179 * @ids: The world wide names, FC4 port roles, etc for
3180 * the virtual port.
3181 * @ret_vport: The pointer to the created vport.
3182 *
3183 * Allocates and creates the vport structure, calls the parent host
3184 * to instantiate the vport, the completes w/ class and sysfs creation.
3185 *
3186 * Notes:
3187 * This routine assumes no locks are held on entry.
3188 */
3189 static int
3190 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3191 struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
3192 {
3193 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3194 struct fc_internal *fci = to_fc_internal(shost->transportt);
3195 struct fc_vport *vport;
3196 struct device *dev;
3197 unsigned long flags;
3198 size_t size;
3199 int error;
3200
3201 *ret_vport = NULL;
3202
3203 if ( ! fci->f->vport_create)
3204 return -ENOENT;
3205
3206 size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3207 vport = kzalloc(size, GFP_KERNEL);
3208 if (unlikely(!vport)) {
3209 printk(KERN_ERR "%s: allocation failure\n", __func__);
3210 return -ENOMEM;
3211 }
3212
3213 vport->vport_state = FC_VPORT_UNKNOWN;
3214 vport->vport_last_state = FC_VPORT_UNKNOWN;
3215 vport->node_name = ids->node_name;
3216 vport->port_name = ids->port_name;
3217 vport->roles = ids->roles;
3218 vport->vport_type = ids->vport_type;
3219 if (fci->f->dd_fcvport_size)
3220 vport->dd_data = &vport[1];
3221 vport->shost = shost;
3222 vport->channel = channel;
3223 vport->flags = FC_VPORT_CREATING;
3224 INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3225
3226 spin_lock_irqsave(shost->host_lock, flags);
3227
3228 if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3229 spin_unlock_irqrestore(shost->host_lock, flags);
3230 kfree(vport);
3231 return -ENOSPC;
3232 }
3233 fc_host->npiv_vports_inuse++;
3234 vport->number = fc_host->next_vport_number++;
3235 list_add_tail(&vport->peers, &fc_host->vports);
3236 get_device(&shost->shost_gendev); /* for fc_host->vport list */
3237
3238 spin_unlock_irqrestore(shost->host_lock, flags);
3239
3240 dev = &vport->dev;
3241 device_initialize(dev); /* takes self reference */
3242 dev->parent = get_device(pdev); /* takes parent reference */
3243 dev->release = fc_vport_dev_release;
3244 dev_set_name(dev, "vport-%d:%d-%d",
3245 shost->host_no, channel, vport->number);
3246 transport_setup_device(dev);
3247
3248 error = device_add(dev);
3249 if (error) {
3250 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3251 goto delete_vport;
3252 }
3253 transport_add_device(dev);
3254 transport_configure_device(dev);
3255
3256 error = fci->f->vport_create(vport, ids->disable);
3257 if (error) {
3258 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3259 goto delete_vport_all;
3260 }
3261
3262 /*
3263 * if the parent isn't the physical adapter's Scsi_Host, ensure
3264 * the Scsi_Host at least contains ia symlink to the vport.
3265 */
3266 if (pdev != &shost->shost_gendev) {
3267 error = sysfs_create_link(&shost->shost_gendev.kobj,
3268 &dev->kobj, dev_name(dev));
3269 if (error)
3270 printk(KERN_ERR
3271 "%s: Cannot create vport symlinks for "
3272 "%s, err=%d\n",
3273 __func__, dev_name(dev), error);
3274 }
3275 spin_lock_irqsave(shost->host_lock, flags);
3276 vport->flags &= ~FC_VPORT_CREATING;
3277 spin_unlock_irqrestore(shost->host_lock, flags);
3278
3279 dev_printk(KERN_NOTICE, pdev,
3280 "%s created via shost%d channel %d\n", dev_name(dev),
3281 shost->host_no, channel);
3282
3283 *ret_vport = vport;
3284
3285 return 0;
3286
3287 delete_vport_all:
3288 transport_remove_device(dev);
3289 device_del(dev);
3290 delete_vport:
3291 transport_destroy_device(dev);
3292 spin_lock_irqsave(shost->host_lock, flags);
3293 list_del(&vport->peers);
3294 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3295 fc_host->npiv_vports_inuse--;
3296 spin_unlock_irqrestore(shost->host_lock, flags);
3297 put_device(dev->parent);
3298 kfree(vport);
3299
3300 return error;
3301 }
3302
3303 /**
3304 * fc_vport_create - Admin App or LLDD requests creation of a vport
3305 * @shost: scsi host the virtual port is connected to.
3306 * @channel: channel on shost port connected to.
3307 * @ids: The world wide names, FC4 port roles, etc for
3308 * the virtual port.
3309 *
3310 * Notes:
3311 * This routine assumes no locks are held on entry.
3312 */
3313 struct fc_vport *
3314 fc_vport_create(struct Scsi_Host *shost, int channel,
3315 struct fc_vport_identifiers *ids)
3316 {
3317 int stat;
3318 struct fc_vport *vport;
3319
3320 stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3321 ids, &vport);
3322 return stat ? NULL : vport;
3323 }
3324 EXPORT_SYMBOL(fc_vport_create);
3325
3326 /**
3327 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3328 * @vport: fc_vport to be terminated
3329 *
3330 * Calls the LLDD vport_delete() function, then deallocates and removes
3331 * the vport from the shost and object tree.
3332 *
3333 * Notes:
3334 * This routine assumes no locks are held on entry.
3335 */
3336 int
3337 fc_vport_terminate(struct fc_vport *vport)
3338 {
3339 struct Scsi_Host *shost = vport_to_shost(vport);
3340 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3341 struct fc_internal *i = to_fc_internal(shost->transportt);
3342 struct device *dev = &vport->dev;
3343 unsigned long flags;
3344 int stat;
3345
3346 spin_lock_irqsave(shost->host_lock, flags);
3347 if (vport->flags & FC_VPORT_CREATING) {
3348 spin_unlock_irqrestore(shost->host_lock, flags);
3349 return -EBUSY;
3350 }
3351 if (vport->flags & (FC_VPORT_DEL)) {
3352 spin_unlock_irqrestore(shost->host_lock, flags);
3353 return -EALREADY;
3354 }
3355 vport->flags |= FC_VPORT_DELETING;
3356 spin_unlock_irqrestore(shost->host_lock, flags);
3357
3358 if (i->f->vport_delete)
3359 stat = i->f->vport_delete(vport);
3360 else
3361 stat = -ENOENT;
3362
3363 spin_lock_irqsave(shost->host_lock, flags);
3364 vport->flags &= ~FC_VPORT_DELETING;
3365 if (!stat) {
3366 vport->flags |= FC_VPORT_DELETED;
3367 list_del(&vport->peers);
3368 fc_host->npiv_vports_inuse--;
3369 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3370 }
3371 spin_unlock_irqrestore(shost->host_lock, flags);
3372
3373 if (stat)
3374 return stat;
3375
3376 if (dev->parent != &shost->shost_gendev)
3377 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3378 transport_remove_device(dev);
3379 device_del(dev);
3380 transport_destroy_device(dev);
3381
3382 /*
3383 * Removing our self-reference should mean our
3384 * release function gets called, which will drop the remaining
3385 * parent reference and free the data structure.
3386 */
3387 put_device(dev); /* for self-reference */
3388
3389 return 0; /* SUCCESS */
3390 }
3391 EXPORT_SYMBOL(fc_vport_terminate);
3392
3393 /**
3394 * fc_vport_sched_delete - workq-based delete request for a vport
3395 * @work: vport to be deleted.
3396 */
3397 static void
3398 fc_vport_sched_delete(struct work_struct *work)
3399 {
3400 struct fc_vport *vport =
3401 container_of(work, struct fc_vport, vport_delete_work);
3402 int stat;
3403
3404 stat = fc_vport_terminate(vport);
3405 if (stat)
3406 dev_printk(KERN_ERR, vport->dev.parent,
3407 "%s: %s could not be deleted created via "
3408 "shost%d channel %d - error %d\n", __func__,
3409 dev_name(&vport->dev), vport->shost->host_no,
3410 vport->channel, stat);
3411 }
3412
3413
3414 /*
3415 * BSG support
3416 */
3417
3418
3419 /**
3420 * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3421 * @job: fc_bsg_job that is to be torn down
3422 */
3423 static void
3424 fc_destroy_bsgjob(struct fc_bsg_job *job)
3425 {
3426 unsigned long flags;
3427
3428 spin_lock_irqsave(&job->job_lock, flags);
3429 if (job->ref_cnt) {
3430 spin_unlock_irqrestore(&job->job_lock, flags);
3431 return;
3432 }
3433 spin_unlock_irqrestore(&job->job_lock, flags);
3434
3435 put_device(job->dev); /* release reference for the request */
3436
3437 kfree(job->request_payload.sg_list);
3438 kfree(job->reply_payload.sg_list);
3439 kfree(job);
3440 }
3441
3442 /**
3443 * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3444 * completed
3445 * @job: fc_bsg_job that is complete
3446 */
3447 static void
3448 fc_bsg_jobdone(struct fc_bsg_job *job)
3449 {
3450 struct request *req = job->req;
3451 struct request *rsp = req->next_rq;
3452 int err;
3453
3454 err = job->req->errors = job->reply->result;
3455
3456 if (err < 0)
3457 /* we're only returning the result field in the reply */
3458 job->req->sense_len = sizeof(uint32_t);
3459 else
3460 job->req->sense_len = job->reply_len;
3461
3462 /* we assume all request payload was transferred, residual == 0 */
3463 req->resid_len = 0;
3464
3465 if (rsp) {
3466 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3467
3468 /* set reply (bidi) residual */
3469 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3470 rsp->resid_len);
3471 }
3472 blk_complete_request(req);
3473 }
3474
3475 /**
3476 * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3477 * @rq: BSG request that holds the job to be destroyed
3478 */
3479 static void fc_bsg_softirq_done(struct request *rq)
3480 {
3481 struct fc_bsg_job *job = rq->special;
3482 unsigned long flags;
3483
3484 spin_lock_irqsave(&job->job_lock, flags);
3485 job->state_flags |= FC_RQST_STATE_DONE;
3486 job->ref_cnt--;
3487 spin_unlock_irqrestore(&job->job_lock, flags);
3488
3489 blk_end_request_all(rq, rq->errors);
3490 fc_destroy_bsgjob(job);
3491 }
3492
3493 /**
3494 * fc_bsg_job_timeout - handler for when a bsg request timesout
3495 * @req: request that timed out
3496 */
3497 static enum blk_eh_timer_return
3498 fc_bsg_job_timeout(struct request *req)
3499 {
3500 struct fc_bsg_job *job = (void *) req->special;
3501 struct Scsi_Host *shost = job->shost;
3502 struct fc_internal *i = to_fc_internal(shost->transportt);
3503 unsigned long flags;
3504 int err = 0, done = 0;
3505
3506 if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3507 return BLK_EH_RESET_TIMER;
3508
3509 spin_lock_irqsave(&job->job_lock, flags);
3510 if (job->state_flags & FC_RQST_STATE_DONE)
3511 done = 1;
3512 else
3513 job->ref_cnt++;
3514 spin_unlock_irqrestore(&job->job_lock, flags);
3515
3516 if (!done && i->f->bsg_timeout) {
3517 /* call LLDD to abort the i/o as it has timed out */
3518 err = i->f->bsg_timeout(job);
3519 if (err)
3520 printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3521 "abort failed with status %d\n", err);
3522 }
3523
3524 /* the blk_end_sync_io() doesn't check the error */
3525 if (done)
3526 return BLK_EH_NOT_HANDLED;
3527 else
3528 return BLK_EH_HANDLED;
3529 }
3530
3531 static int
3532 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3533 {
3534 size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3535
3536 BUG_ON(!req->nr_phys_segments);
3537
3538 buf->sg_list = kzalloc(sz, GFP_KERNEL);
3539 if (!buf->sg_list)
3540 return -ENOMEM;
3541 sg_init_table(buf->sg_list, req->nr_phys_segments);
3542 buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3543 buf->payload_len = blk_rq_bytes(req);
3544 return 0;
3545 }
3546
3547
3548 /**
3549 * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3550 * bsg request
3551 * @shost: SCSI Host corresponding to the bsg object
3552 * @rport: (optional) FC Remote Port corresponding to the bsg object
3553 * @req: BSG request that needs a job structure
3554 */
3555 static int
3556 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3557 struct request *req)
3558 {
3559 struct fc_internal *i = to_fc_internal(shost->transportt);
3560 struct request *rsp = req->next_rq;
3561 struct fc_bsg_job *job;
3562 int ret;
3563
3564 BUG_ON(req->special);
3565
3566 job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3567 GFP_KERNEL);
3568 if (!job)
3569 return -ENOMEM;
3570
3571 /*
3572 * Note: this is a bit silly.
3573 * The request gets formatted as a SGIO v4 ioctl request, which
3574 * then gets reformatted as a blk request, which then gets
3575 * reformatted as a fc bsg request. And on completion, we have
3576 * to wrap return results such that SGIO v4 thinks it was a scsi
3577 * status. I hope this was all worth it.
3578 */
3579
3580 req->special = job;
3581 job->shost = shost;
3582 job->rport = rport;
3583 job->req = req;
3584 if (i->f->dd_bsg_size)
3585 job->dd_data = (void *)&job[1];
3586 spin_lock_init(&job->job_lock);
3587 job->request = (struct fc_bsg_request *)req->cmd;
3588 job->request_len = req->cmd_len;
3589 job->reply = req->sense;
3590 job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3591 * allocated */
3592 if (req->bio) {
3593 ret = fc_bsg_map_buffer(&job->request_payload, req);
3594 if (ret)
3595 goto failjob_rls_job;
3596 }
3597 if (rsp && rsp->bio) {
3598 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3599 if (ret)
3600 goto failjob_rls_rqst_payload;
3601 }
3602 job->job_done = fc_bsg_jobdone;
3603 if (rport)
3604 job->dev = &rport->dev;
3605 else
3606 job->dev = &shost->shost_gendev;
3607 get_device(job->dev); /* take a reference for the request */
3608
3609 job->ref_cnt = 1;
3610
3611 return 0;
3612
3613
3614 failjob_rls_rqst_payload:
3615 kfree(job->request_payload.sg_list);
3616 failjob_rls_job:
3617 kfree(job);
3618 return -ENOMEM;
3619 }
3620
3621
3622 enum fc_dispatch_result {
3623 FC_DISPATCH_BREAK, /* on return, q is locked, break from q loop */
3624 FC_DISPATCH_LOCKED, /* on return, q is locked, continue on */
3625 FC_DISPATCH_UNLOCKED, /* on return, q is unlocked, continue on */
3626 };
3627
3628
3629 /**
3630 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3631 * @q: fc host request queue
3632 * @shost: scsi host rport attached to
3633 * @job: bsg job to be processed
3634 */
3635 static enum fc_dispatch_result
3636 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3637 struct fc_bsg_job *job)
3638 {
3639 struct fc_internal *i = to_fc_internal(shost->transportt);
3640 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3641 int ret;
3642
3643 /* Validate the host command */
3644 switch (job->request->msgcode) {
3645 case FC_BSG_HST_ADD_RPORT:
3646 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3647 break;
3648
3649 case FC_BSG_HST_DEL_RPORT:
3650 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3651 break;
3652
3653 case FC_BSG_HST_ELS_NOLOGIN:
3654 cmdlen += sizeof(struct fc_bsg_host_els);
3655 /* there better be a xmt and rcv payloads */
3656 if ((!job->request_payload.payload_len) ||
3657 (!job->reply_payload.payload_len)) {
3658 ret = -EINVAL;
3659 goto fail_host_msg;
3660 }
3661 break;
3662
3663 case FC_BSG_HST_CT:
3664 cmdlen += sizeof(struct fc_bsg_host_ct);
3665 /* there better be xmt and rcv payloads */
3666 if ((!job->request_payload.payload_len) ||
3667 (!job->reply_payload.payload_len)) {
3668 ret = -EINVAL;
3669 goto fail_host_msg;
3670 }
3671 break;
3672
3673 case FC_BSG_HST_VENDOR:
3674 cmdlen += sizeof(struct fc_bsg_host_vendor);
3675 if ((shost->hostt->vendor_id == 0L) ||
3676 (job->request->rqst_data.h_vendor.vendor_id !=
3677 shost->hostt->vendor_id)) {
3678 ret = -ESRCH;
3679 goto fail_host_msg;
3680 }
3681 break;
3682
3683 default:
3684 ret = -EBADR;
3685 goto fail_host_msg;
3686 }
3687
3688 /* check if we really have all the request data needed */
3689 if (job->request_len < cmdlen) {
3690 ret = -ENOMSG;
3691 goto fail_host_msg;
3692 }
3693
3694 ret = i->f->bsg_request(job);
3695 if (!ret)
3696 return FC_DISPATCH_UNLOCKED;
3697
3698 fail_host_msg:
3699 /* return the errno failure code as the only status */
3700 BUG_ON(job->reply_len < sizeof(uint32_t));
3701 job->reply->reply_payload_rcv_len = 0;
3702 job->reply->result = ret;
3703 job->reply_len = sizeof(uint32_t);
3704 fc_bsg_jobdone(job);
3705 return FC_DISPATCH_UNLOCKED;
3706 }
3707
3708
3709 /*
3710 * fc_bsg_goose_queue - restart rport queue in case it was stopped
3711 * @rport: rport to be restarted
3712 */
3713 static void
3714 fc_bsg_goose_queue(struct fc_rport *rport)
3715 {
3716 int flagset;
3717 unsigned long flags;
3718
3719 if (!rport->rqst_q)
3720 return;
3721
3722 get_device(&rport->dev);
3723
3724 spin_lock_irqsave(rport->rqst_q->queue_lock, flags);
3725 flagset = test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags) &&
3726 !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags);
3727 if (flagset)
3728 queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q);
3729 __blk_run_queue(rport->rqst_q);
3730 if (flagset)
3731 queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q);
3732 spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags);
3733
3734 put_device(&rport->dev);
3735 }
3736
3737
3738 /**
3739 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3740 * @q: rport request queue
3741 * @shost: scsi host rport attached to
3742 * @rport: rport request destined to
3743 * @job: bsg job to be processed
3744 */
3745 static enum fc_dispatch_result
3746 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3747 struct fc_rport *rport, struct fc_bsg_job *job)
3748 {
3749 struct fc_internal *i = to_fc_internal(shost->transportt);
3750 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3751 int ret;
3752
3753 /* Validate the rport command */
3754 switch (job->request->msgcode) {
3755 case FC_BSG_RPT_ELS:
3756 cmdlen += sizeof(struct fc_bsg_rport_els);
3757 goto check_bidi;
3758
3759 case FC_BSG_RPT_CT:
3760 cmdlen += sizeof(struct fc_bsg_rport_ct);
3761 check_bidi:
3762 /* there better be xmt and rcv payloads */
3763 if ((!job->request_payload.payload_len) ||
3764 (!job->reply_payload.payload_len)) {
3765 ret = -EINVAL;
3766 goto fail_rport_msg;
3767 }
3768 break;
3769 default:
3770 ret = -EBADR;
3771 goto fail_rport_msg;
3772 }
3773
3774 /* check if we really have all the request data needed */
3775 if (job->request_len < cmdlen) {
3776 ret = -ENOMSG;
3777 goto fail_rport_msg;
3778 }
3779
3780 ret = i->f->bsg_request(job);
3781 if (!ret)
3782 return FC_DISPATCH_UNLOCKED;
3783
3784 fail_rport_msg:
3785 /* return the errno failure code as the only status */
3786 BUG_ON(job->reply_len < sizeof(uint32_t));
3787 job->reply->reply_payload_rcv_len = 0;
3788 job->reply->result = ret;
3789 job->reply_len = sizeof(uint32_t);
3790 fc_bsg_jobdone(job);
3791 return FC_DISPATCH_UNLOCKED;
3792 }
3793
3794
3795 /**
3796 * fc_bsg_request_handler - generic handler for bsg requests
3797 * @q: request queue to manage
3798 * @shost: Scsi_Host related to the bsg object
3799 * @rport: FC remote port related to the bsg object (optional)
3800 * @dev: device structure for bsg object
3801 */
3802 static void
3803 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3804 struct fc_rport *rport, struct device *dev)
3805 {
3806 struct request *req;
3807 struct fc_bsg_job *job;
3808 enum fc_dispatch_result ret;
3809
3810 if (!get_device(dev))
3811 return;
3812
3813 while (!blk_queue_plugged(q)) {
3814 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
3815 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3816 break;
3817
3818 req = blk_fetch_request(q);
3819 if (!req)
3820 break;
3821
3822 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3823 req->errors = -ENXIO;
3824 spin_unlock_irq(q->queue_lock);
3825 blk_end_request(req, -ENXIO, blk_rq_bytes(req));
3826 spin_lock_irq(q->queue_lock);
3827 continue;
3828 }
3829
3830 spin_unlock_irq(q->queue_lock);
3831
3832 ret = fc_req_to_bsgjob(shost, rport, req);
3833 if (ret) {
3834 req->errors = ret;
3835 blk_end_request(req, ret, blk_rq_bytes(req));
3836 spin_lock_irq(q->queue_lock);
3837 continue;
3838 }
3839
3840 job = req->special;
3841
3842 /* check if we have the msgcode value at least */
3843 if (job->request_len < sizeof(uint32_t)) {
3844 BUG_ON(job->reply_len < sizeof(uint32_t));
3845 job->reply->reply_payload_rcv_len = 0;
3846 job->reply->result = -ENOMSG;
3847 job->reply_len = sizeof(uint32_t);
3848 fc_bsg_jobdone(job);
3849 spin_lock_irq(q->queue_lock);
3850 continue;
3851 }
3852
3853 /* the dispatch routines will unlock the queue_lock */
3854 if (rport)
3855 ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3856 else
3857 ret = fc_bsg_host_dispatch(q, shost, job);
3858
3859 /* did dispatcher hit state that can't process any more */
3860 if (ret == FC_DISPATCH_BREAK)
3861 break;
3862
3863 /* did dispatcher had released the lock */
3864 if (ret == FC_DISPATCH_UNLOCKED)
3865 spin_lock_irq(q->queue_lock);
3866 }
3867
3868 spin_unlock_irq(q->queue_lock);
3869 put_device(dev);
3870 spin_lock_irq(q->queue_lock);
3871 }
3872
3873
3874 /**
3875 * fc_bsg_host_handler - handler for bsg requests for a fc host
3876 * @q: fc host request queue
3877 */
3878 static void
3879 fc_bsg_host_handler(struct request_queue *q)
3880 {
3881 struct Scsi_Host *shost = q->queuedata;
3882
3883 fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
3884 }
3885
3886
3887 /**
3888 * fc_bsg_rport_handler - handler for bsg requests for a fc rport
3889 * @q: rport request queue
3890 */
3891 static void
3892 fc_bsg_rport_handler(struct request_queue *q)
3893 {
3894 struct fc_rport *rport = q->queuedata;
3895 struct Scsi_Host *shost = rport_to_shost(rport);
3896
3897 fc_bsg_request_handler(q, shost, rport, &rport->dev);
3898 }
3899
3900
3901 /**
3902 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
3903 * @shost: shost for fc_host
3904 * @fc_host: fc_host adding the structures to
3905 */
3906 static int
3907 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
3908 {
3909 struct device *dev = &shost->shost_gendev;
3910 struct fc_internal *i = to_fc_internal(shost->transportt);
3911 struct request_queue *q;
3912 int err;
3913 char bsg_name[20];
3914
3915 fc_host->rqst_q = NULL;
3916
3917 if (!i->f->bsg_request)
3918 return -ENOTSUPP;
3919
3920 snprintf(bsg_name, sizeof(bsg_name),
3921 "fc_host%d", shost->host_no);
3922
3923 q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
3924 if (!q) {
3925 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3926 "initialize - no request queue\n",
3927 shost->host_no);
3928 return -ENOMEM;
3929 }
3930
3931 q->queuedata = shost;
3932 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3933 blk_queue_softirq_done(q, fc_bsg_softirq_done);
3934 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3935 blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
3936
3937 err = bsg_register_queue(q, dev, bsg_name, NULL);
3938 if (err) {
3939 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3940 "initialize - register queue\n",
3941 shost->host_no);
3942 blk_cleanup_queue(q);
3943 return err;
3944 }
3945
3946 fc_host->rqst_q = q;
3947 return 0;
3948 }
3949
3950
3951 /**
3952 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
3953 * @shost: shost that rport is attached to
3954 * @rport: rport that the bsg hooks are being attached to
3955 */
3956 static int
3957 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
3958 {
3959 struct device *dev = &rport->dev;
3960 struct fc_internal *i = to_fc_internal(shost->transportt);
3961 struct request_queue *q;
3962 int err;
3963
3964 rport->rqst_q = NULL;
3965
3966 if (!i->f->bsg_request)
3967 return -ENOTSUPP;
3968
3969 q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
3970 if (!q) {
3971 printk(KERN_ERR "%s: bsg interface failed to "
3972 "initialize - no request queue\n",
3973 dev->kobj.name);
3974 return -ENOMEM;
3975 }
3976
3977 q->queuedata = rport;
3978 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3979 blk_queue_softirq_done(q, fc_bsg_softirq_done);
3980 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3981 blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
3982
3983 err = bsg_register_queue(q, dev, NULL, NULL);
3984 if (err) {
3985 printk(KERN_ERR "%s: bsg interface failed to "
3986 "initialize - register queue\n",
3987 dev->kobj.name);
3988 blk_cleanup_queue(q);
3989 return err;
3990 }
3991
3992 rport->rqst_q = q;
3993 return 0;
3994 }
3995
3996
3997 /**
3998 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
3999 * @q: the request_queue that is to be torn down.
4000 */
4001 static void
4002 fc_bsg_remove(struct request_queue *q)
4003 {
4004 if (q) {
4005 bsg_unregister_queue(q);
4006 blk_cleanup_queue(q);
4007 }
4008 }
4009
4010
4011 /* Original Author: Martin Hicks */
4012 MODULE_AUTHOR("James Smart");
4013 MODULE_DESCRIPTION("FC Transport Attributes");
4014 MODULE_LICENSE("GPL");
4015
4016 module_init(fc_transport_init);
4017 module_exit(fc_transport_exit);
kernel-based virtual machine