1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * FiberChannel transport specific attributes exported to sysfs.
4 *
5 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
6 * Copyright (C) 2004-2007 James Smart, Emulex Corporation
7 * Rewrite for host, target, device, and remote port attributes,
8 * statistics, and service functions...
9 * Add vports, etc
10 */
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/slab.h>
14 #include <linux/delay.h>
15 #include <linux/kernel.h>
16 #include <linux/bsg-lib.h>
17 #include <scsi/scsi_device.h>
18 #include <scsi/scsi_host.h>
19 #include <scsi/scsi_transport.h>
20 #include <scsi/scsi_transport_fc.h>
21 #include <scsi/scsi_cmnd.h>
22 #include <net/netlink.h>
23 #include <scsi/scsi_netlink_fc.h>
24 #include <scsi/scsi_bsg_fc.h>
25 #include <uapi/scsi/fc/fc_els.h>
26 #include "scsi_priv.h"
27
28 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
29 static void fc_vport_sched_delete(struct work_struct *work);
30 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
31 struct device *pdev, struct fc_vport_identifiers *ids,
32 struct fc_vport **vport);
33 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
34 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
35 static void fc_bsg_remove(struct request_queue *);
36 static void fc_bsg_goose_queue(struct fc_rport *);
37 static void fc_li_stats_update(u16 event_type,
38 struct fc_fpin_stats *stats);
39 static void fc_delivery_stats_update(u32 reason_code,
40 struct fc_fpin_stats *stats);
41 static void fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats);
42
43 /*
44 * Module Parameters
45 */
46
47 /*
48 * dev_loss_tmo: the default number of seconds that the FC transport
49 * should insulate the loss of a remote port.
50 * The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
51 */
52 static unsigned int fc_dev_loss_tmo = 60; /* seconds */
53
54 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
55 MODULE_PARM_DESC(dev_loss_tmo,
56 "Maximum number of seconds that the FC transport should"
57 " insulate the loss of a remote port. Once this value is"
58 " exceeded, the scsi target is removed. Value should be"
59 " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
60 " fast_io_fail_tmo is not set.");
61
62 /*
63 * Redefine so that we can have same named attributes in the
64 * sdev/starget/host objects.
65 */
66 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
67 struct device_attribute device_attr_##_prefix##_##_name = \
68 __ATTR(_name,_mode,_show,_store)
69
70 #define fc_enum_name_search(title, table_type, table) \
71 static const char *get_fc_##title##_name(enum table_type table_key) \
72 { \
73 int i; \
74 char *name = NULL; \
75 \
76 for (i = 0; i < ARRAY_SIZE(table); i++) { \
77 if (table[i].value == table_key) { \
78 name = table[i].name; \
79 break; \
80 } \
81 } \
82 return name; \
83 }
84
85 #define fc_enum_name_match(title, table_type, table) \
86 static int get_fc_##title##_match(const char *table_key, \
87 enum table_type *value) \
88 { \
89 int i; \
90 \
91 for (i = 0; i < ARRAY_SIZE(table); i++) { \
92 if (strncmp(table_key, table[i].name, \
93 table[i].matchlen) == 0) { \
94 *value = table[i].value; \
95 return 0; /* success */ \
96 } \
97 } \
98 return 1; /* failure */ \
99 }
100
101
102 /* Convert fc_port_type values to ascii string name */
103 static struct {
104 enum fc_port_type value;
105 char *name;
106 } fc_port_type_names[] = {
107 { FC_PORTTYPE_UNKNOWN, "Unknown" },
108 { FC_PORTTYPE_OTHER, "Other" },
109 { FC_PORTTYPE_NOTPRESENT, "Not Present" },
110 { FC_PORTTYPE_NPORT, "NPort (fabric via point-to-point)" },
111 { FC_PORTTYPE_NLPORT, "NLPort (fabric via loop)" },
112 { FC_PORTTYPE_LPORT, "LPort (private loop)" },
113 { FC_PORTTYPE_PTP, "Point-To-Point (direct nport connection)" },
114 { FC_PORTTYPE_NPIV, "NPIV VPORT" },
115 };
116 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
117 #define FC_PORTTYPE_MAX_NAMELEN 50
118
119 /* Reuse fc_port_type enum function for vport_type */
120 #define get_fc_vport_type_name get_fc_port_type_name
121
122
123 /* Convert fc_host_event_code values to ascii string name */
124 static const struct {
125 enum fc_host_event_code value;
126 char *name;
127 } fc_host_event_code_names[] = {
128 { FCH_EVT_LIP, "lip" },
129 { FCH_EVT_LINKUP, "link_up" },
130 { FCH_EVT_LINKDOWN, "link_down" },
131 { FCH_EVT_LIPRESET, "lip_reset" },
132 { FCH_EVT_RSCN, "rscn" },
133 { FCH_EVT_ADAPTER_CHANGE, "adapter_chg" },
134 { FCH_EVT_PORT_UNKNOWN, "port_unknown" },
135 { FCH_EVT_PORT_ONLINE, "port_online" },
136 { FCH_EVT_PORT_OFFLINE, "port_offline" },
137 { FCH_EVT_PORT_FABRIC, "port_fabric" },
138 { FCH_EVT_LINK_UNKNOWN, "link_unknown" },
139 { FCH_EVT_LINK_FPIN, "link_FPIN" },
140 { FCH_EVT_LINK_FPIN_ACK, "link_FPIN_ACK" },
141 { FCH_EVT_VENDOR_UNIQUE, "vendor_unique" },
142 };
143 fc_enum_name_search(host_event_code, fc_host_event_code,
144 fc_host_event_code_names)
145 #define FC_HOST_EVENT_CODE_MAX_NAMELEN 30
146
147
148 /* Convert fc_port_state values to ascii string name */
149 static struct {
150 enum fc_port_state value;
151 char *name;
152 int matchlen;
153 } fc_port_state_names[] = {
154 { FC_PORTSTATE_UNKNOWN, "Unknown", 7},
155 { FC_PORTSTATE_NOTPRESENT, "Not Present", 11 },
156 { FC_PORTSTATE_ONLINE, "Online", 6 },
157 { FC_PORTSTATE_OFFLINE, "Offline", 7 },
158 { FC_PORTSTATE_BLOCKED, "Blocked", 7 },
159 { FC_PORTSTATE_BYPASSED, "Bypassed", 8 },
160 { FC_PORTSTATE_DIAGNOSTICS, "Diagnostics", 11 },
161 { FC_PORTSTATE_LINKDOWN, "Linkdown", 8 },
162 { FC_PORTSTATE_ERROR, "Error", 5 },
163 { FC_PORTSTATE_LOOPBACK, "Loopback", 8 },
164 { FC_PORTSTATE_DELETED, "Deleted", 7 },
165 { FC_PORTSTATE_MARGINAL, "Marginal", 8 },
166 };
167 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
168 fc_enum_name_match(port_state, fc_port_state, fc_port_state_names)
169 #define FC_PORTSTATE_MAX_NAMELEN 20
170
171
172 /* Convert fc_vport_state values to ascii string name */
173 static struct {
174 enum fc_vport_state value;
175 char *name;
176 } fc_vport_state_names[] = {
177 { FC_VPORT_UNKNOWN, "Unknown" },
178 { FC_VPORT_ACTIVE, "Active" },
179 { FC_VPORT_DISABLED, "Disabled" },
180 { FC_VPORT_LINKDOWN, "Linkdown" },
181 { FC_VPORT_INITIALIZING, "Initializing" },
182 { FC_VPORT_NO_FABRIC_SUPP, "No Fabric Support" },
183 { FC_VPORT_NO_FABRIC_RSCS, "No Fabric Resources" },
184 { FC_VPORT_FABRIC_LOGOUT, "Fabric Logout" },
185 { FC_VPORT_FABRIC_REJ_WWN, "Fabric Rejected WWN" },
186 { FC_VPORT_FAILED, "VPort Failed" },
187 };
188 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
189 #define FC_VPORTSTATE_MAX_NAMELEN 24
190
191 /* Reuse fc_vport_state enum function for vport_last_state */
192 #define get_fc_vport_last_state_name get_fc_vport_state_name
193
194
195 /* Convert fc_tgtid_binding_type values to ascii string name */
196 static const struct {
197 enum fc_tgtid_binding_type value;
198 char *name;
199 int matchlen;
200 } fc_tgtid_binding_type_names[] = {
201 { FC_TGTID_BIND_NONE, "none", 4 },
202 { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
203 { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
204 { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
205 };
206 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
207 fc_tgtid_binding_type_names)
208 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
209 fc_tgtid_binding_type_names)
210 #define FC_BINDTYPE_MAX_NAMELEN 30
211
212
213 #define fc_bitfield_name_search(title, table) \
214 static ssize_t \
215 get_fc_##title##_names(u32 table_key, char *buf) \
216 { \
217 char *prefix = ""; \
218 ssize_t len = 0; \
219 int i; \
220 \
221 for (i = 0; i < ARRAY_SIZE(table); i++) { \
222 if (table[i].value & table_key) { \
223 len += sprintf(buf + len, "%s%s", \
224 prefix, table[i].name); \
225 prefix = ", "; \
226 } \
227 } \
228 len += sprintf(buf + len, "\n"); \
229 return len; \
230 }
231
232
233 /* Convert FC_COS bit values to ascii string name */
234 static const struct {
235 u32 value;
236 char *name;
237 } fc_cos_names[] = {
238 { FC_COS_CLASS1, "Class 1" },
239 { FC_COS_CLASS2, "Class 2" },
240 { FC_COS_CLASS3, "Class 3" },
241 { FC_COS_CLASS4, "Class 4" },
242 { FC_COS_CLASS6, "Class 6" },
243 };
244 fc_bitfield_name_search(cos, fc_cos_names)
245
246
247 /* Convert FC_PORTSPEED bit values to ascii string name */
248 static const struct {
249 u32 value;
250 char *name;
251 } fc_port_speed_names[] = {
252 { FC_PORTSPEED_1GBIT, "1 Gbit" },
253 { FC_PORTSPEED_2GBIT, "2 Gbit" },
254 { FC_PORTSPEED_4GBIT, "4 Gbit" },
255 { FC_PORTSPEED_10GBIT, "10 Gbit" },
256 { FC_PORTSPEED_8GBIT, "8 Gbit" },
257 { FC_PORTSPEED_16GBIT, "16 Gbit" },
258 { FC_PORTSPEED_32GBIT, "32 Gbit" },
259 { FC_PORTSPEED_20GBIT, "20 Gbit" },
260 { FC_PORTSPEED_40GBIT, "40 Gbit" },
261 { FC_PORTSPEED_50GBIT, "50 Gbit" },
262 { FC_PORTSPEED_100GBIT, "100 Gbit" },
263 { FC_PORTSPEED_25GBIT, "25 Gbit" },
264 { FC_PORTSPEED_64GBIT, "64 Gbit" },
265 { FC_PORTSPEED_128GBIT, "128 Gbit" },
266 { FC_PORTSPEED_256GBIT, "256 Gbit" },
267 { FC_PORTSPEED_NOT_NEGOTIATED, "Not Negotiated" },
268 };
fc_bitfield_name_search(port_speed,fc_port_speed_names)269 fc_bitfield_name_search(port_speed, fc_port_speed_names)
270
271
272 static int
273 show_fc_fc4s (char *buf, u8 *fc4_list)
274 {
275 int i, len=0;
276
277 for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
278 len += sprintf(buf + len , "0x%02x ", *fc4_list);
279 len += sprintf(buf + len, "\n");
280 return len;
281 }
282
283
284 /* Convert FC_PORT_ROLE bit values to ascii string name */
285 static const struct {
286 u32 value;
287 char *name;
288 } fc_port_role_names[] = {
289 { FC_PORT_ROLE_FCP_TARGET, "FCP Target" },
290 { FC_PORT_ROLE_FCP_INITIATOR, "FCP Initiator" },
291 { FC_PORT_ROLE_IP_PORT, "IP Port" },
292 { FC_PORT_ROLE_FCP_DUMMY_INITIATOR, "FCP Dummy Initiator" },
293 { FC_PORT_ROLE_NVME_INITIATOR, "NVMe Initiator" },
294 { FC_PORT_ROLE_NVME_TARGET, "NVMe Target" },
295 { FC_PORT_ROLE_NVME_DISCOVERY, "NVMe Discovery" },
296 };
297 fc_bitfield_name_search(port_roles, fc_port_role_names)
298
299 /*
300 * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
301 */
302 #define FC_WELLKNOWN_PORTID_MASK 0xfffff0
303 #define FC_WELLKNOWN_ROLE_MASK 0x00000f
304 #define FC_FPORT_PORTID 0x00000e
305 #define FC_FABCTLR_PORTID 0x00000d
306 #define FC_DIRSRVR_PORTID 0x00000c
307 #define FC_TIMESRVR_PORTID 0x00000b
308 #define FC_MGMTSRVR_PORTID 0x00000a
309
310
311 static void fc_timeout_deleted_rport(struct work_struct *work);
312 static void fc_timeout_fail_rport_io(struct work_struct *work);
313 static void fc_scsi_scan_rport(struct work_struct *work);
314
315 /*
316 * Attribute counts pre object type...
317 * Increase these values if you add attributes
318 */
319 #define FC_STARGET_NUM_ATTRS 3
320 #define FC_RPORT_NUM_ATTRS 10
321 #define FC_VPORT_NUM_ATTRS 9
322 #define FC_HOST_NUM_ATTRS 29
323
324 struct fc_internal {
325 struct scsi_transport_template t;
326 struct fc_function_template *f;
327
328 /*
329 * For attributes : each object has :
330 * An array of the actual attributes structures
331 * An array of null-terminated pointers to the attribute
332 * structures - used for mid-layer interaction.
333 *
334 * The attribute containers for the starget and host are are
335 * part of the midlayer. As the remote port is specific to the
336 * fc transport, we must provide the attribute container.
337 */
338 struct device_attribute private_starget_attrs[
339 FC_STARGET_NUM_ATTRS];
340 struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
341
342 struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
343 struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
344
345 struct transport_container rport_attr_cont;
346 struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
347 struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
348
349 struct transport_container vport_attr_cont;
350 struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
351 struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
352 };
353
354 #define to_fc_internal(tmpl) container_of(tmpl, struct fc_internal, t)
355
fc_target_setup(struct transport_container * tc,struct device * dev,struct device * cdev)356 static int fc_target_setup(struct transport_container *tc, struct device *dev,
357 struct device *cdev)
358 {
359 struct scsi_target *starget = to_scsi_target(dev);
360 struct fc_rport *rport = starget_to_rport(starget);
361
362 /*
363 * if parent is remote port, use values from remote port.
364 * Otherwise, this host uses the fc_transport, but not the
365 * remote port interface. As such, initialize to known non-values.
366 */
367 if (rport) {
368 fc_starget_node_name(starget) = rport->node_name;
369 fc_starget_port_name(starget) = rport->port_name;
370 fc_starget_port_id(starget) = rport->port_id;
371 } else {
372 fc_starget_node_name(starget) = -1;
373 fc_starget_port_name(starget) = -1;
374 fc_starget_port_id(starget) = -1;
375 }
376
377 return 0;
378 }
379
380 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
381 "fc_transport",
382 fc_target_setup,
383 NULL,
384 NULL);
385
fc_host_setup(struct transport_container * tc,struct device * dev,struct device * cdev)386 static int fc_host_setup(struct transport_container *tc, struct device *dev,
387 struct device *cdev)
388 {
389 struct Scsi_Host *shost = dev_to_shost(dev);
390 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
391
392 /*
393 * Set default values easily detected by the midlayer as
394 * failure cases. The scsi lldd is responsible for initializing
395 * all transport attributes to valid values per host.
396 */
397 fc_host->node_name = -1;
398 fc_host->port_name = -1;
399 fc_host->permanent_port_name = -1;
400 fc_host->supported_classes = FC_COS_UNSPECIFIED;
401 memset(fc_host->supported_fc4s, 0,
402 sizeof(fc_host->supported_fc4s));
403 fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
404 fc_host->maxframe_size = -1;
405 fc_host->max_npiv_vports = 0;
406 memset(fc_host->serial_number, 0,
407 sizeof(fc_host->serial_number));
408 memset(fc_host->manufacturer, 0,
409 sizeof(fc_host->manufacturer));
410 memset(fc_host->model, 0,
411 sizeof(fc_host->model));
412 memset(fc_host->model_description, 0,
413 sizeof(fc_host->model_description));
414 memset(fc_host->hardware_version, 0,
415 sizeof(fc_host->hardware_version));
416 memset(fc_host->driver_version, 0,
417 sizeof(fc_host->driver_version));
418 memset(fc_host->firmware_version, 0,
419 sizeof(fc_host->firmware_version));
420 memset(fc_host->optionrom_version, 0,
421 sizeof(fc_host->optionrom_version));
422
423 fc_host->port_id = -1;
424 fc_host->port_type = FC_PORTTYPE_UNKNOWN;
425 fc_host->port_state = FC_PORTSTATE_UNKNOWN;
426 memset(fc_host->active_fc4s, 0,
427 sizeof(fc_host->active_fc4s));
428 fc_host->speed = FC_PORTSPEED_UNKNOWN;
429 fc_host->fabric_name = -1;
430 memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
431 memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
432 memset(&fc_host->fpin_stats, 0, sizeof(fc_host->fpin_stats));
433
434 fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
435
436 INIT_LIST_HEAD(&fc_host->rports);
437 INIT_LIST_HEAD(&fc_host->rport_bindings);
438 INIT_LIST_HEAD(&fc_host->vports);
439 fc_host->next_rport_number = 0;
440 fc_host->next_target_id = 0;
441 fc_host->next_vport_number = 0;
442 fc_host->npiv_vports_inuse = 0;
443
444 fc_host->work_q = alloc_workqueue("fc_wq_%d", 0, 0, shost->host_no);
445 if (!fc_host->work_q)
446 return -ENOMEM;
447
448 fc_host->dev_loss_tmo = fc_dev_loss_tmo;
449 fc_host->devloss_work_q = alloc_workqueue("fc_dl_%d", 0, 0,
450 shost->host_no);
451 if (!fc_host->devloss_work_q) {
452 destroy_workqueue(fc_host->work_q);
453 fc_host->work_q = NULL;
454 return -ENOMEM;
455 }
456
457 fc_bsg_hostadd(shost, fc_host);
458 /* ignore any bsg add error - we just can't do sgio */
459
460 return 0;
461 }
462
fc_host_remove(struct transport_container * tc,struct device * dev,struct device * cdev)463 static int fc_host_remove(struct transport_container *tc, struct device *dev,
464 struct device *cdev)
465 {
466 struct Scsi_Host *shost = dev_to_shost(dev);
467 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
468
469 fc_bsg_remove(fc_host->rqst_q);
470 return 0;
471 }
472
473 static DECLARE_TRANSPORT_CLASS(fc_host_class,
474 "fc_host",
475 fc_host_setup,
476 fc_host_remove,
477 NULL);
478
479 /*
480 * Setup and Remove actions for remote ports are handled
481 * in the service functions below.
482 */
483 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
484 "fc_remote_ports",
485 NULL,
486 NULL,
487 NULL);
488
489 /*
490 * Setup and Remove actions for virtual ports are handled
491 * in the service functions below.
492 */
493 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
494 "fc_vports",
495 NULL,
496 NULL,
497 NULL);
498
499 /*
500 * Netlink Infrastructure
501 */
502
503 static atomic_t fc_event_seq;
504
505 /**
506 * fc_get_event_number - Obtain the next sequential FC event number
507 *
508 * Notes:
509 * We could have inlined this, but it would have required fc_event_seq to
510 * be exposed. For now, live with the subroutine call.
511 * Atomic used to avoid lock/unlock...
512 */
513 u32
fc_get_event_number(void)514 fc_get_event_number(void)
515 {
516 return atomic_add_return(1, &fc_event_seq);
517 }
518 EXPORT_SYMBOL(fc_get_event_number);
519
520 /**
521 * fc_host_post_fc_event - routine to do the work of posting an event
522 * on an fc_host.
523 * @shost: host the event occurred on
524 * @event_number: fc event number obtained from get_fc_event_number()
525 * @event_code: fc_host event being posted
526 * @data_len: amount, in bytes, of event data
527 * @data_buf: pointer to event data
528 * @vendor_id: value for Vendor id
529 *
530 * Notes:
531 * This routine assumes no locks are held on entry.
532 */
533 void
fc_host_post_fc_event(struct Scsi_Host * shost,u32 event_number,enum fc_host_event_code event_code,u32 data_len,char * data_buf,u64 vendor_id)534 fc_host_post_fc_event(struct Scsi_Host *shost, u32 event_number,
535 enum fc_host_event_code event_code,
536 u32 data_len, char *data_buf, u64 vendor_id)
537 {
538 struct sk_buff *skb;
539 struct nlmsghdr *nlh;
540 struct fc_nl_event *event;
541 const char *name;
542 size_t len, padding;
543 int err;
544
545 if (!data_buf || data_len < 4)
546 data_len = 0;
547
548 if (!scsi_nl_sock) {
549 err = -ENOENT;
550 goto send_fail;
551 }
552
553 len = FC_NL_MSGALIGN(sizeof(*event) - sizeof(event->event_data) + data_len);
554
555 skb = nlmsg_new(len, GFP_KERNEL);
556 if (!skb) {
557 err = -ENOBUFS;
558 goto send_fail;
559 }
560
561 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
562 if (!nlh) {
563 err = -ENOBUFS;
564 goto send_fail_skb;
565 }
566 event = nlmsg_data(nlh);
567
568 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
569 FC_NL_ASYNC_EVENT, len);
570 event->seconds = ktime_get_real_seconds();
571 event->vendor_id = vendor_id;
572 event->host_no = shost->host_no;
573 event->event_datalen = data_len; /* bytes */
574 event->event_num = event_number;
575 event->event_code = event_code;
576 if (data_len)
577 memcpy(event->event_data_flex, data_buf, data_len);
578 padding = len - offsetof(typeof(*event), event_data_flex) - data_len;
579 memset(event->event_data_flex + data_len, 0, padding);
580
581 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
582 GFP_KERNEL);
583 return;
584
585 send_fail_skb:
586 kfree_skb(skb);
587 send_fail:
588 name = get_fc_host_event_code_name(event_code);
589 printk(KERN_WARNING
590 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
591 __func__, shost->host_no,
592 (name) ? name : "<unknown>",
593 (data_len) ? *((u32 *)data_buf) : 0xFFFFFFFF, err);
594 return;
595 }
596 EXPORT_SYMBOL(fc_host_post_fc_event);
597
598 /**
599 * fc_host_post_event - called to post an even on an fc_host.
600 * @shost: host the event occurred on
601 * @event_number: fc event number obtained from get_fc_event_number()
602 * @event_code: fc_host event being posted
603 * @event_data: 32bits of data for the event being posted
604 *
605 * Notes:
606 * This routine assumes no locks are held on entry.
607 */
608 void
fc_host_post_event(struct Scsi_Host * shost,u32 event_number,enum fc_host_event_code event_code,u32 event_data)609 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
610 enum fc_host_event_code event_code, u32 event_data)
611 {
612 fc_host_post_fc_event(shost, event_number, event_code,
613 (u32)sizeof(u32), (char *)&event_data, 0);
614 }
615 EXPORT_SYMBOL(fc_host_post_event);
616
617
618 /**
619 * fc_host_post_vendor_event - called to post a vendor unique event
620 * on an fc_host
621 * @shost: host the event occurred on
622 * @event_number: fc event number obtained from get_fc_event_number()
623 * @data_len: amount, in bytes, of vendor unique data
624 * @data_buf: pointer to vendor unique data
625 * @vendor_id: Vendor id
626 *
627 * Notes:
628 * This routine assumes no locks are held on entry.
629 */
630 void
fc_host_post_vendor_event(struct Scsi_Host * shost,u32 event_number,u32 data_len,char * data_buf,u64 vendor_id)631 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
632 u32 data_len, char * data_buf, u64 vendor_id)
633 {
634 fc_host_post_fc_event(shost, event_number, FCH_EVT_VENDOR_UNIQUE,
635 data_len, data_buf, vendor_id);
636 }
637 EXPORT_SYMBOL(fc_host_post_vendor_event);
638
639 /**
640 * fc_find_rport_by_wwpn - find the fc_rport pointer for a given wwpn
641 * @shost: host the fc_rport is associated with
642 * @wwpn: wwpn of the fc_rport device
643 *
644 * Notes:
645 * This routine assumes no locks are held on entry.
646 */
647 struct fc_rport *
fc_find_rport_by_wwpn(struct Scsi_Host * shost,u64 wwpn)648 fc_find_rport_by_wwpn(struct Scsi_Host *shost, u64 wwpn)
649 {
650 struct fc_rport *rport;
651 unsigned long flags;
652
653 spin_lock_irqsave(shost->host_lock, flags);
654
655 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
656 if (rport->port_state != FC_PORTSTATE_ONLINE)
657 continue;
658
659 if (rport->port_name == wwpn) {
660 spin_unlock_irqrestore(shost->host_lock, flags);
661 return rport;
662 }
663 }
664
665 spin_unlock_irqrestore(shost->host_lock, flags);
666 return NULL;
667 }
668 EXPORT_SYMBOL(fc_find_rport_by_wwpn);
669
670 static void
fc_li_stats_update(u16 event_type,struct fc_fpin_stats * stats)671 fc_li_stats_update(u16 event_type,
672 struct fc_fpin_stats *stats)
673 {
674 stats->li++;
675 switch (event_type) {
676 case FPIN_LI_UNKNOWN:
677 stats->li_failure_unknown++;
678 break;
679 case FPIN_LI_LINK_FAILURE:
680 stats->li_link_failure_count++;
681 break;
682 case FPIN_LI_LOSS_OF_SYNC:
683 stats->li_loss_of_sync_count++;
684 break;
685 case FPIN_LI_LOSS_OF_SIG:
686 stats->li_loss_of_signals_count++;
687 break;
688 case FPIN_LI_PRIM_SEQ_ERR:
689 stats->li_prim_seq_err_count++;
690 break;
691 case FPIN_LI_INVALID_TX_WD:
692 stats->li_invalid_tx_word_count++;
693 break;
694 case FPIN_LI_INVALID_CRC:
695 stats->li_invalid_crc_count++;
696 break;
697 case FPIN_LI_DEVICE_SPEC:
698 stats->li_device_specific++;
699 break;
700 }
701 }
702
703 static void
fc_delivery_stats_update(u32 reason_code,struct fc_fpin_stats * stats)704 fc_delivery_stats_update(u32 reason_code, struct fc_fpin_stats *stats)
705 {
706 stats->dn++;
707 switch (reason_code) {
708 case FPIN_DELI_UNKNOWN:
709 stats->dn_unknown++;
710 break;
711 case FPIN_DELI_TIMEOUT:
712 stats->dn_timeout++;
713 break;
714 case FPIN_DELI_UNABLE_TO_ROUTE:
715 stats->dn_unable_to_route++;
716 break;
717 case FPIN_DELI_DEVICE_SPEC:
718 stats->dn_device_specific++;
719 break;
720 }
721 }
722
723 static void
fc_cn_stats_update(u16 event_type,struct fc_fpin_stats * stats)724 fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats)
725 {
726 stats->cn++;
727 switch (event_type) {
728 case FPIN_CONGN_CLEAR:
729 stats->cn_clear++;
730 break;
731 case FPIN_CONGN_LOST_CREDIT:
732 stats->cn_lost_credit++;
733 break;
734 case FPIN_CONGN_CREDIT_STALL:
735 stats->cn_credit_stall++;
736 break;
737 case FPIN_CONGN_OVERSUBSCRIPTION:
738 stats->cn_oversubscription++;
739 break;
740 case FPIN_CONGN_DEVICE_SPEC:
741 stats->cn_device_specific++;
742 }
743 }
744
745 /*
746 * fc_fpin_li_stats_update - routine to update Link Integrity
747 * event statistics.
748 * @shost: host the FPIN was received on
749 * @tlv: pointer to link integrity descriptor
750 *
751 */
752 static void
fc_fpin_li_stats_update(struct Scsi_Host * shost,struct fc_tlv_desc * tlv)753 fc_fpin_li_stats_update(struct Scsi_Host *shost, struct fc_tlv_desc *tlv)
754 {
755 u8 i;
756 struct fc_rport *rport = NULL;
757 struct fc_rport *attach_rport = NULL;
758 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
759 struct fc_fn_li_desc *li_desc = (struct fc_fn_li_desc *)tlv;
760 u16 event_type = be16_to_cpu(li_desc->event_type);
761 u64 wwpn;
762
763 rport = fc_find_rport_by_wwpn(shost,
764 be64_to_cpu(li_desc->attached_wwpn));
765 if (rport &&
766 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
767 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
768 attach_rport = rport;
769 fc_li_stats_update(event_type, &attach_rport->fpin_stats);
770 }
771
772 if (be32_to_cpu(li_desc->pname_count) > 0) {
773 for (i = 0;
774 i < be32_to_cpu(li_desc->pname_count);
775 i++) {
776 wwpn = be64_to_cpu(li_desc->pname_list[i]);
777 rport = fc_find_rport_by_wwpn(shost, wwpn);
778 if (rport &&
779 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
780 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
781 if (rport == attach_rport)
782 continue;
783 fc_li_stats_update(event_type,
784 &rport->fpin_stats);
785 }
786 }
787 }
788
789 if (fc_host->port_name == be64_to_cpu(li_desc->attached_wwpn))
790 fc_li_stats_update(event_type, &fc_host->fpin_stats);
791 }
792
793 /*
794 * fc_fpin_delivery_stats_update - routine to update Delivery Notification
795 * event statistics.
796 * @shost: host the FPIN was received on
797 * @tlv: pointer to delivery descriptor
798 *
799 */
800 static void
fc_fpin_delivery_stats_update(struct Scsi_Host * shost,struct fc_tlv_desc * tlv)801 fc_fpin_delivery_stats_update(struct Scsi_Host *shost,
802 struct fc_tlv_desc *tlv)
803 {
804 struct fc_rport *rport = NULL;
805 struct fc_rport *attach_rport = NULL;
806 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
807 struct fc_fn_deli_desc *dn_desc = (struct fc_fn_deli_desc *)tlv;
808 u32 reason_code = be32_to_cpu(dn_desc->deli_reason_code);
809
810 rport = fc_find_rport_by_wwpn(shost,
811 be64_to_cpu(dn_desc->attached_wwpn));
812 if (rport &&
813 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
814 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
815 attach_rport = rport;
816 fc_delivery_stats_update(reason_code,
817 &attach_rport->fpin_stats);
818 }
819
820 if (fc_host->port_name == be64_to_cpu(dn_desc->attached_wwpn))
821 fc_delivery_stats_update(reason_code, &fc_host->fpin_stats);
822 }
823
824 /*
825 * fc_fpin_peer_congn_stats_update - routine to update Peer Congestion
826 * event statistics.
827 * @shost: host the FPIN was received on
828 * @tlv: pointer to peer congestion descriptor
829 *
830 */
831 static void
fc_fpin_peer_congn_stats_update(struct Scsi_Host * shost,struct fc_tlv_desc * tlv)832 fc_fpin_peer_congn_stats_update(struct Scsi_Host *shost,
833 struct fc_tlv_desc *tlv)
834 {
835 u8 i;
836 struct fc_rport *rport = NULL;
837 struct fc_rport *attach_rport = NULL;
838 struct fc_fn_peer_congn_desc *pc_desc =
839 (struct fc_fn_peer_congn_desc *)tlv;
840 u16 event_type = be16_to_cpu(pc_desc->event_type);
841 u64 wwpn;
842
843 rport = fc_find_rport_by_wwpn(shost,
844 be64_to_cpu(pc_desc->attached_wwpn));
845 if (rport &&
846 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
847 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
848 attach_rport = rport;
849 fc_cn_stats_update(event_type, &attach_rport->fpin_stats);
850 }
851
852 if (be32_to_cpu(pc_desc->pname_count) > 0) {
853 for (i = 0;
854 i < be32_to_cpu(pc_desc->pname_count);
855 i++) {
856 wwpn = be64_to_cpu(pc_desc->pname_list[i]);
857 rport = fc_find_rport_by_wwpn(shost, wwpn);
858 if (rport &&
859 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
860 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
861 if (rport == attach_rport)
862 continue;
863 fc_cn_stats_update(event_type,
864 &rport->fpin_stats);
865 }
866 }
867 }
868 }
869
870 /*
871 * fc_fpin_congn_stats_update - routine to update Congestion
872 * event statistics.
873 * @shost: host the FPIN was received on
874 * @tlv: pointer to congestion descriptor
875 *
876 */
877 static void
fc_fpin_congn_stats_update(struct Scsi_Host * shost,struct fc_tlv_desc * tlv)878 fc_fpin_congn_stats_update(struct Scsi_Host *shost,
879 struct fc_tlv_desc *tlv)
880 {
881 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
882 struct fc_fn_congn_desc *congn = (struct fc_fn_congn_desc *)tlv;
883
884 fc_cn_stats_update(be16_to_cpu(congn->event_type),
885 &fc_host->fpin_stats);
886 }
887
888 /**
889 * fc_host_fpin_rcv - routine to process a received FPIN.
890 * @shost: host the FPIN was received on
891 * @fpin_len: length of FPIN payload, in bytes
892 * @fpin_buf: pointer to FPIN payload
893 * @event_acknowledge: 1, if LLDD handles this event.
894 * Notes:
895 * This routine assumes no locks are held on entry.
896 */
897 void
fc_host_fpin_rcv(struct Scsi_Host * shost,u32 fpin_len,char * fpin_buf,u8 event_acknowledge)898 fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf,
899 u8 event_acknowledge)
900 {
901 struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf;
902 struct fc_tlv_desc *tlv;
903 u32 bytes_remain;
904 u32 dtag;
905 enum fc_host_event_code event_code =
906 event_acknowledge ? FCH_EVT_LINK_FPIN_ACK : FCH_EVT_LINK_FPIN;
907
908 /* Update Statistics */
909 tlv = (struct fc_tlv_desc *)&fpin->fpin_desc[0];
910 bytes_remain = fpin_len - offsetof(struct fc_els_fpin, fpin_desc);
911 bytes_remain = min_t(u32, bytes_remain, be32_to_cpu(fpin->desc_len));
912
913 while (bytes_remain >= FC_TLV_DESC_HDR_SZ &&
914 bytes_remain >= FC_TLV_DESC_SZ_FROM_LENGTH(tlv)) {
915 dtag = be32_to_cpu(tlv->desc_tag);
916 switch (dtag) {
917 case ELS_DTAG_LNK_INTEGRITY:
918 fc_fpin_li_stats_update(shost, tlv);
919 break;
920 case ELS_DTAG_DELIVERY:
921 fc_fpin_delivery_stats_update(shost, tlv);
922 break;
923 case ELS_DTAG_PEER_CONGEST:
924 fc_fpin_peer_congn_stats_update(shost, tlv);
925 break;
926 case ELS_DTAG_CONGESTION:
927 fc_fpin_congn_stats_update(shost, tlv);
928 }
929
930 bytes_remain -= FC_TLV_DESC_SZ_FROM_LENGTH(tlv);
931 tlv = fc_tlv_next_desc(tlv);
932 }
933
934 fc_host_post_fc_event(shost, fc_get_event_number(),
935 event_code, fpin_len, fpin_buf, 0);
936 }
937 EXPORT_SYMBOL(fc_host_fpin_rcv);
938
939
fc_transport_init(void)940 static __init int fc_transport_init(void)
941 {
942 int error;
943
944 atomic_set(&fc_event_seq, 0);
945
946 error = transport_class_register(&fc_host_class);
947 if (error)
948 return error;
949 error = transport_class_register(&fc_vport_class);
950 if (error)
951 goto unreg_host_class;
952 error = transport_class_register(&fc_rport_class);
953 if (error)
954 goto unreg_vport_class;
955 error = transport_class_register(&fc_transport_class);
956 if (error)
957 goto unreg_rport_class;
958 return 0;
959
960 unreg_rport_class:
961 transport_class_unregister(&fc_rport_class);
962 unreg_vport_class:
963 transport_class_unregister(&fc_vport_class);
964 unreg_host_class:
965 transport_class_unregister(&fc_host_class);
966 return error;
967 }
968
fc_transport_exit(void)969 static void __exit fc_transport_exit(void)
970 {
971 transport_class_unregister(&fc_transport_class);
972 transport_class_unregister(&fc_rport_class);
973 transport_class_unregister(&fc_host_class);
974 transport_class_unregister(&fc_vport_class);
975 }
976
977 /*
978 * FC Remote Port Attribute Management
979 */
980
981 #define fc_rport_show_function(field, format_string, sz, cast) \
982 static ssize_t \
983 show_fc_rport_##field (struct device *dev, \
984 struct device_attribute *attr, char *buf) \
985 { \
986 struct fc_rport *rport = transport_class_to_rport(dev); \
987 struct Scsi_Host *shost = rport_to_shost(rport); \
988 struct fc_internal *i = to_fc_internal(shost->transportt); \
989 if ((i->f->get_rport_##field) && \
990 !((rport->port_state == FC_PORTSTATE_BLOCKED) || \
991 (rport->port_state == FC_PORTSTATE_DELETED) || \
992 (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
993 i->f->get_rport_##field(rport); \
994 return snprintf(buf, sz, format_string, cast rport->field); \
995 }
996
997 #define fc_rport_store_function(field) \
998 static ssize_t \
999 store_fc_rport_##field(struct device *dev, \
1000 struct device_attribute *attr, \
1001 const char *buf, size_t count) \
1002 { \
1003 int val; \
1004 struct fc_rport *rport = transport_class_to_rport(dev); \
1005 struct Scsi_Host *shost = rport_to_shost(rport); \
1006 struct fc_internal *i = to_fc_internal(shost->transportt); \
1007 char *cp; \
1008 if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
1009 (rport->port_state == FC_PORTSTATE_DELETED) || \
1010 (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
1011 return -EBUSY; \
1012 val = simple_strtoul(buf, &cp, 0); \
1013 if (*cp && (*cp != '\n')) \
1014 return -EINVAL; \
1015 i->f->set_rport_##field(rport, val); \
1016 return count; \
1017 }
1018
1019 #define fc_rport_rd_attr(field, format_string, sz) \
1020 fc_rport_show_function(field, format_string, sz, ) \
1021 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1022 show_fc_rport_##field, NULL)
1023
1024 #define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
1025 fc_rport_show_function(field, format_string, sz, (cast)) \
1026 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1027 show_fc_rport_##field, NULL)
1028
1029 #define fc_rport_rw_attr(field, format_string, sz) \
1030 fc_rport_show_function(field, format_string, sz, ) \
1031 fc_rport_store_function(field) \
1032 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
1033 show_fc_rport_##field, \
1034 store_fc_rport_##field)
1035
1036
1037 #define fc_private_rport_show_function(field, format_string, sz, cast) \
1038 static ssize_t \
1039 show_fc_rport_##field (struct device *dev, \
1040 struct device_attribute *attr, char *buf) \
1041 { \
1042 struct fc_rport *rport = transport_class_to_rport(dev); \
1043 return snprintf(buf, sz, format_string, cast rport->field); \
1044 }
1045
1046 #define fc_private_rport_rd_attr(field, format_string, sz) \
1047 fc_private_rport_show_function(field, format_string, sz, ) \
1048 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1049 show_fc_rport_##field, NULL)
1050
1051 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
1052 fc_private_rport_show_function(field, format_string, sz, (cast)) \
1053 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1054 show_fc_rport_##field, NULL)
1055
1056
1057 #define fc_private_rport_rd_enum_attr(title, maxlen) \
1058 static ssize_t \
1059 show_fc_rport_##title (struct device *dev, \
1060 struct device_attribute *attr, char *buf) \
1061 { \
1062 struct fc_rport *rport = transport_class_to_rport(dev); \
1063 const char *name; \
1064 name = get_fc_##title##_name(rport->title); \
1065 if (!name) \
1066 return -EINVAL; \
1067 return snprintf(buf, maxlen, "%s\n", name); \
1068 } \
1069 static FC_DEVICE_ATTR(rport, title, S_IRUGO, \
1070 show_fc_rport_##title, NULL)
1071
1072
1073 #define SETUP_RPORT_ATTRIBUTE_RD(field) \
1074 i->private_rport_attrs[count] = device_attr_rport_##field; \
1075 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
1076 i->private_rport_attrs[count].store = NULL; \
1077 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1078 if (i->f->show_rport_##field) \
1079 count++
1080
1081 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
1082 i->private_rport_attrs[count] = device_attr_rport_##field; \
1083 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
1084 i->private_rport_attrs[count].store = NULL; \
1085 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1086 count++
1087
1088 #define SETUP_RPORT_ATTRIBUTE_RW(field) \
1089 i->private_rport_attrs[count] = device_attr_rport_##field; \
1090 if (!i->f->set_rport_##field) { \
1091 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
1092 i->private_rport_attrs[count].store = NULL; \
1093 } \
1094 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1095 if (i->f->show_rport_##field) \
1096 count++
1097
1098 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
1099 { \
1100 i->private_rport_attrs[count] = device_attr_rport_##field; \
1101 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1102 count++; \
1103 }
1104
1105
1106 /* The FC Transport Remote Port Attributes: */
1107
1108 /* Fixed Remote Port Attributes */
1109
1110 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
1111
1112 static ssize_t
show_fc_rport_supported_classes(struct device * dev,struct device_attribute * attr,char * buf)1113 show_fc_rport_supported_classes (struct device *dev,
1114 struct device_attribute *attr, char *buf)
1115 {
1116 struct fc_rport *rport = transport_class_to_rport(dev);
1117 if (rport->supported_classes == FC_COS_UNSPECIFIED)
1118 return snprintf(buf, 20, "unspecified\n");
1119 return get_fc_cos_names(rport->supported_classes, buf);
1120 }
1121 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
1122 show_fc_rport_supported_classes, NULL);
1123
1124 /* Dynamic Remote Port Attributes */
1125
1126 /*
1127 * dev_loss_tmo attribute
1128 */
fc_str_to_dev_loss(const char * buf,unsigned long * val)1129 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
1130 {
1131 char *cp;
1132
1133 *val = simple_strtoul(buf, &cp, 0);
1134 if (*cp && (*cp != '\n'))
1135 return -EINVAL;
1136 /*
1137 * Check for overflow; dev_loss_tmo is u32
1138 */
1139 if (*val > UINT_MAX)
1140 return -EINVAL;
1141
1142 return 0;
1143 }
1144
fc_rport_set_dev_loss_tmo(struct fc_rport * rport,unsigned long val)1145 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
1146 unsigned long val)
1147 {
1148 struct Scsi_Host *shost = rport_to_shost(rport);
1149 struct fc_internal *i = to_fc_internal(shost->transportt);
1150
1151 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
1152 (rport->port_state == FC_PORTSTATE_DELETED) ||
1153 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
1154 return -EBUSY;
1155 /*
1156 * Check for overflow; dev_loss_tmo is u32
1157 */
1158 if (val > UINT_MAX)
1159 return -EINVAL;
1160
1161 /*
1162 * If fast_io_fail is off we have to cap
1163 * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
1164 */
1165 if (rport->fast_io_fail_tmo == -1 &&
1166 val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
1167 return -EINVAL;
1168
1169 i->f->set_rport_dev_loss_tmo(rport, val);
1170 return 0;
1171 }
1172
1173 fc_rport_show_function(dev_loss_tmo, "%u\n", 20, )
1174 static ssize_t
store_fc_rport_dev_loss_tmo(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1175 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
1176 const char *buf, size_t count)
1177 {
1178 struct fc_rport *rport = transport_class_to_rport(dev);
1179 unsigned long val;
1180 int rc;
1181
1182 rc = fc_str_to_dev_loss(buf, &val);
1183 if (rc)
1184 return rc;
1185
1186 rc = fc_rport_set_dev_loss_tmo(rport, val);
1187 if (rc)
1188 return rc;
1189 return count;
1190 }
1191 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
1192 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
1193
1194
1195 /* Private Remote Port Attributes */
1196
1197 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1198 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1199 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
1200
1201 static ssize_t
show_fc_rport_roles(struct device * dev,struct device_attribute * attr,char * buf)1202 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
1203 char *buf)
1204 {
1205 struct fc_rport *rport = transport_class_to_rport(dev);
1206
1207 /* identify any roles that are port_id specific */
1208 if ((rport->port_id != -1) &&
1209 (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
1210 FC_WELLKNOWN_PORTID_MASK) {
1211 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
1212 case FC_FPORT_PORTID:
1213 return snprintf(buf, 30, "Fabric Port\n");
1214 case FC_FABCTLR_PORTID:
1215 return snprintf(buf, 30, "Fabric Controller\n");
1216 case FC_DIRSRVR_PORTID:
1217 return snprintf(buf, 30, "Directory Server\n");
1218 case FC_TIMESRVR_PORTID:
1219 return snprintf(buf, 30, "Time Server\n");
1220 case FC_MGMTSRVR_PORTID:
1221 return snprintf(buf, 30, "Management Server\n");
1222 default:
1223 return snprintf(buf, 30, "Unknown Fabric Entity\n");
1224 }
1225 } else {
1226 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
1227 return snprintf(buf, 20, "unknown\n");
1228 return get_fc_port_roles_names(rport->roles, buf);
1229 }
1230 }
1231 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
1232 show_fc_rport_roles, NULL);
1233
fc_rport_set_marginal_state(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1234 static ssize_t fc_rport_set_marginal_state(struct device *dev,
1235 struct device_attribute *attr,
1236 const char *buf, size_t count)
1237 {
1238 struct fc_rport *rport = transport_class_to_rport(dev);
1239 enum fc_port_state port_state;
1240 int ret = 0;
1241
1242 ret = get_fc_port_state_match(buf, &port_state);
1243 if (ret)
1244 return -EINVAL;
1245 if (port_state == FC_PORTSTATE_MARGINAL) {
1246 /*
1247 * Change the state to Marginal only if the
1248 * current rport state is Online
1249 * Allow only Online->Marginal
1250 */
1251 if (rport->port_state == FC_PORTSTATE_ONLINE)
1252 rport->port_state = port_state;
1253 else if (port_state != rport->port_state)
1254 return -EINVAL;
1255 } else if (port_state == FC_PORTSTATE_ONLINE) {
1256 /*
1257 * Change the state to Online only if the
1258 * current rport state is Marginal
1259 * Allow only Marginal->Online
1260 */
1261 if (rport->port_state == FC_PORTSTATE_MARGINAL)
1262 rport->port_state = port_state;
1263 else if (port_state != rport->port_state)
1264 return -EINVAL;
1265 } else
1266 return -EINVAL;
1267 return count;
1268 }
1269
1270 static ssize_t
show_fc_rport_port_state(struct device * dev,struct device_attribute * attr,char * buf)1271 show_fc_rport_port_state(struct device *dev,
1272 struct device_attribute *attr, char *buf)
1273 {
1274 const char *name;
1275 struct fc_rport *rport = transport_class_to_rport(dev);
1276
1277 name = get_fc_port_state_name(rport->port_state);
1278 if (!name)
1279 return -EINVAL;
1280
1281 return snprintf(buf, 20, "%s\n", name);
1282 }
1283
1284 static FC_DEVICE_ATTR(rport, port_state, 0444 | 0200,
1285 show_fc_rport_port_state, fc_rport_set_marginal_state);
1286
1287 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
1288
1289 /*
1290 * fast_io_fail_tmo attribute
1291 */
1292 static ssize_t
show_fc_rport_fast_io_fail_tmo(struct device * dev,struct device_attribute * attr,char * buf)1293 show_fc_rport_fast_io_fail_tmo (struct device *dev,
1294 struct device_attribute *attr, char *buf)
1295 {
1296 struct fc_rport *rport = transport_class_to_rport(dev);
1297
1298 if (rport->fast_io_fail_tmo == -1)
1299 return snprintf(buf, 5, "off\n");
1300 return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
1301 }
1302
1303 static ssize_t
store_fc_rport_fast_io_fail_tmo(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1304 store_fc_rport_fast_io_fail_tmo(struct device *dev,
1305 struct device_attribute *attr, const char *buf,
1306 size_t count)
1307 {
1308 int val;
1309 char *cp;
1310 struct fc_rport *rport = transport_class_to_rport(dev);
1311
1312 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
1313 (rport->port_state == FC_PORTSTATE_DELETED) ||
1314 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
1315 return -EBUSY;
1316 if (strncmp(buf, "off", 3) == 0)
1317 rport->fast_io_fail_tmo = -1;
1318 else {
1319 val = simple_strtoul(buf, &cp, 0);
1320 if ((*cp && (*cp != '\n')) || (val < 0))
1321 return -EINVAL;
1322 /*
1323 * Cap fast_io_fail by dev_loss_tmo or
1324 * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
1325 */
1326 if ((val >= rport->dev_loss_tmo) ||
1327 (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
1328 return -EINVAL;
1329
1330 rport->fast_io_fail_tmo = val;
1331 }
1332 return count;
1333 }
1334 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
1335 show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
1336
1337 #define fc_rport_fpin_statistic(name) \
1338 static ssize_t fc_rport_fpinstat_##name(struct device *cd, \
1339 struct device_attribute *attr, \
1340 char *buf) \
1341 { \
1342 struct fc_rport *rport = transport_class_to_rport(cd); \
1343 \
1344 return snprintf(buf, 20, "0x%llx\n", rport->fpin_stats.name); \
1345 } \
1346 static FC_DEVICE_ATTR(rport, fpin_##name, 0444, fc_rport_fpinstat_##name, NULL)
1347
1348 fc_rport_fpin_statistic(dn);
1349 fc_rport_fpin_statistic(dn_unknown);
1350 fc_rport_fpin_statistic(dn_timeout);
1351 fc_rport_fpin_statistic(dn_unable_to_route);
1352 fc_rport_fpin_statistic(dn_device_specific);
1353 fc_rport_fpin_statistic(cn);
1354 fc_rport_fpin_statistic(cn_clear);
1355 fc_rport_fpin_statistic(cn_lost_credit);
1356 fc_rport_fpin_statistic(cn_credit_stall);
1357 fc_rport_fpin_statistic(cn_oversubscription);
1358 fc_rport_fpin_statistic(cn_device_specific);
1359 fc_rport_fpin_statistic(li);
1360 fc_rport_fpin_statistic(li_failure_unknown);
1361 fc_rport_fpin_statistic(li_link_failure_count);
1362 fc_rport_fpin_statistic(li_loss_of_sync_count);
1363 fc_rport_fpin_statistic(li_loss_of_signals_count);
1364 fc_rport_fpin_statistic(li_prim_seq_err_count);
1365 fc_rport_fpin_statistic(li_invalid_tx_word_count);
1366 fc_rport_fpin_statistic(li_invalid_crc_count);
1367 fc_rport_fpin_statistic(li_device_specific);
1368
1369 static struct attribute *fc_rport_statistics_attrs[] = {
1370 &device_attr_rport_fpin_dn.attr,
1371 &device_attr_rport_fpin_dn_unknown.attr,
1372 &device_attr_rport_fpin_dn_timeout.attr,
1373 &device_attr_rport_fpin_dn_unable_to_route.attr,
1374 &device_attr_rport_fpin_dn_device_specific.attr,
1375 &device_attr_rport_fpin_li.attr,
1376 &device_attr_rport_fpin_li_failure_unknown.attr,
1377 &device_attr_rport_fpin_li_link_failure_count.attr,
1378 &device_attr_rport_fpin_li_loss_of_sync_count.attr,
1379 &device_attr_rport_fpin_li_loss_of_signals_count.attr,
1380 &device_attr_rport_fpin_li_prim_seq_err_count.attr,
1381 &device_attr_rport_fpin_li_invalid_tx_word_count.attr,
1382 &device_attr_rport_fpin_li_invalid_crc_count.attr,
1383 &device_attr_rport_fpin_li_device_specific.attr,
1384 &device_attr_rport_fpin_cn.attr,
1385 &device_attr_rport_fpin_cn_clear.attr,
1386 &device_attr_rport_fpin_cn_lost_credit.attr,
1387 &device_attr_rport_fpin_cn_credit_stall.attr,
1388 &device_attr_rport_fpin_cn_oversubscription.attr,
1389 &device_attr_rport_fpin_cn_device_specific.attr,
1390 NULL
1391 };
1392
1393 static struct attribute_group fc_rport_statistics_group = {
1394 .name = "statistics",
1395 .attrs = fc_rport_statistics_attrs,
1396 };
1397
1398
1399 /*
1400 * FC SCSI Target Attribute Management
1401 */
1402
1403 /*
1404 * Note: in the target show function we recognize when the remote
1405 * port is in the hierarchy and do not allow the driver to get
1406 * involved in sysfs functions. The driver only gets involved if
1407 * it's the "old" style that doesn't use rports.
1408 */
1409 #define fc_starget_show_function(field, format_string, sz, cast) \
1410 static ssize_t \
1411 show_fc_starget_##field (struct device *dev, \
1412 struct device_attribute *attr, char *buf) \
1413 { \
1414 struct scsi_target *starget = transport_class_to_starget(dev); \
1415 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
1416 struct fc_internal *i = to_fc_internal(shost->transportt); \
1417 struct fc_rport *rport = starget_to_rport(starget); \
1418 if (rport) \
1419 fc_starget_##field(starget) = rport->field; \
1420 else if (i->f->get_starget_##field) \
1421 i->f->get_starget_##field(starget); \
1422 return snprintf(buf, sz, format_string, \
1423 cast fc_starget_##field(starget)); \
1424 }
1425
1426 #define fc_starget_rd_attr(field, format_string, sz) \
1427 fc_starget_show_function(field, format_string, sz, ) \
1428 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1429 show_fc_starget_##field, NULL)
1430
1431 #define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
1432 fc_starget_show_function(field, format_string, sz, (cast)) \
1433 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1434 show_fc_starget_##field, NULL)
1435
1436 #define SETUP_STARGET_ATTRIBUTE_RD(field) \
1437 i->private_starget_attrs[count] = device_attr_starget_##field; \
1438 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1439 i->private_starget_attrs[count].store = NULL; \
1440 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1441 if (i->f->show_starget_##field) \
1442 count++
1443
1444 #define SETUP_STARGET_ATTRIBUTE_RW(field) \
1445 i->private_starget_attrs[count] = device_attr_starget_##field; \
1446 if (!i->f->set_starget_##field) { \
1447 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1448 i->private_starget_attrs[count].store = NULL; \
1449 } \
1450 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1451 if (i->f->show_starget_##field) \
1452 count++
1453
1454 /* The FC Transport SCSI Target Attributes: */
1455 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1456 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1457 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1458
1459
1460 /*
1461 * FC Virtual Port Attribute Management
1462 */
1463
1464 #define fc_vport_show_function(field, format_string, sz, cast) \
1465 static ssize_t \
1466 show_fc_vport_##field (struct device *dev, \
1467 struct device_attribute *attr, char *buf) \
1468 { \
1469 struct fc_vport *vport = transport_class_to_vport(dev); \
1470 struct Scsi_Host *shost = vport_to_shost(vport); \
1471 struct fc_internal *i = to_fc_internal(shost->transportt); \
1472 if ((i->f->get_vport_##field) && \
1473 !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))) \
1474 i->f->get_vport_##field(vport); \
1475 return snprintf(buf, sz, format_string, cast vport->field); \
1476 }
1477
1478 #define fc_vport_store_function(field) \
1479 static ssize_t \
1480 store_fc_vport_##field(struct device *dev, \
1481 struct device_attribute *attr, \
1482 const char *buf, size_t count) \
1483 { \
1484 int val; \
1485 struct fc_vport *vport = transport_class_to_vport(dev); \
1486 struct Scsi_Host *shost = vport_to_shost(vport); \
1487 struct fc_internal *i = to_fc_internal(shost->transportt); \
1488 char *cp; \
1489 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1490 return -EBUSY; \
1491 val = simple_strtoul(buf, &cp, 0); \
1492 if (*cp && (*cp != '\n')) \
1493 return -EINVAL; \
1494 i->f->set_vport_##field(vport, val); \
1495 return count; \
1496 }
1497
1498 #define fc_vport_store_str_function(field, slen) \
1499 static ssize_t \
1500 store_fc_vport_##field(struct device *dev, \
1501 struct device_attribute *attr, \
1502 const char *buf, size_t count) \
1503 { \
1504 struct fc_vport *vport = transport_class_to_vport(dev); \
1505 struct Scsi_Host *shost = vport_to_shost(vport); \
1506 struct fc_internal *i = to_fc_internal(shost->transportt); \
1507 unsigned int cnt=count; \
1508 \
1509 /* count may include a LF at end of string */ \
1510 if (buf[cnt-1] == '\n') \
1511 cnt--; \
1512 if (cnt > ((slen) - 1)) \
1513 return -EINVAL; \
1514 memcpy(vport->field, buf, cnt); \
1515 i->f->set_vport_##field(vport); \
1516 return count; \
1517 }
1518
1519 #define fc_vport_rd_attr(field, format_string, sz) \
1520 fc_vport_show_function(field, format_string, sz, ) \
1521 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1522 show_fc_vport_##field, NULL)
1523
1524 #define fc_vport_rd_attr_cast(field, format_string, sz, cast) \
1525 fc_vport_show_function(field, format_string, sz, (cast)) \
1526 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1527 show_fc_vport_##field, NULL)
1528
1529 #define fc_vport_rw_attr(field, format_string, sz) \
1530 fc_vport_show_function(field, format_string, sz, ) \
1531 fc_vport_store_function(field) \
1532 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1533 show_fc_vport_##field, \
1534 store_fc_vport_##field)
1535
1536 #define fc_private_vport_show_function(field, format_string, sz, cast) \
1537 static ssize_t \
1538 show_fc_vport_##field (struct device *dev, \
1539 struct device_attribute *attr, char *buf) \
1540 { \
1541 struct fc_vport *vport = transport_class_to_vport(dev); \
1542 return snprintf(buf, sz, format_string, cast vport->field); \
1543 }
1544
1545 #define fc_private_vport_store_u32_function(field) \
1546 static ssize_t \
1547 store_fc_vport_##field(struct device *dev, \
1548 struct device_attribute *attr, \
1549 const char *buf, size_t count) \
1550 { \
1551 u32 val; \
1552 struct fc_vport *vport = transport_class_to_vport(dev); \
1553 char *cp; \
1554 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1555 return -EBUSY; \
1556 val = simple_strtoul(buf, &cp, 0); \
1557 if (*cp && (*cp != '\n')) \
1558 return -EINVAL; \
1559 vport->field = val; \
1560 return count; \
1561 }
1562
1563
1564 #define fc_private_vport_rd_attr(field, format_string, sz) \
1565 fc_private_vport_show_function(field, format_string, sz, ) \
1566 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1567 show_fc_vport_##field, NULL)
1568
1569 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast) \
1570 fc_private_vport_show_function(field, format_string, sz, (cast)) \
1571 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1572 show_fc_vport_##field, NULL)
1573
1574 #define fc_private_vport_rw_u32_attr(field, format_string, sz) \
1575 fc_private_vport_show_function(field, format_string, sz, ) \
1576 fc_private_vport_store_u32_function(field) \
1577 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1578 show_fc_vport_##field, \
1579 store_fc_vport_##field)
1580
1581
1582 #define fc_private_vport_rd_enum_attr(title, maxlen) \
1583 static ssize_t \
1584 show_fc_vport_##title (struct device *dev, \
1585 struct device_attribute *attr, \
1586 char *buf) \
1587 { \
1588 struct fc_vport *vport = transport_class_to_vport(dev); \
1589 const char *name; \
1590 name = get_fc_##title##_name(vport->title); \
1591 if (!name) \
1592 return -EINVAL; \
1593 return snprintf(buf, maxlen, "%s\n", name); \
1594 } \
1595 static FC_DEVICE_ATTR(vport, title, S_IRUGO, \
1596 show_fc_vport_##title, NULL)
1597
1598
1599 #define SETUP_VPORT_ATTRIBUTE_RD(field) \
1600 i->private_vport_attrs[count] = device_attr_vport_##field; \
1601 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1602 i->private_vport_attrs[count].store = NULL; \
1603 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1604 if (i->f->get_##field) \
1605 count++
1606 /* NOTE: Above MACRO differs: checks function not show bit */
1607
1608 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field) \
1609 i->private_vport_attrs[count] = device_attr_vport_##field; \
1610 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1611 i->private_vport_attrs[count].store = NULL; \
1612 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1613 count++
1614
1615 #define SETUP_VPORT_ATTRIBUTE_WR(field) \
1616 i->private_vport_attrs[count] = device_attr_vport_##field; \
1617 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1618 if (i->f->field) \
1619 count++
1620 /* NOTE: Above MACRO differs: checks function */
1621
1622 #define SETUP_VPORT_ATTRIBUTE_RW(field) \
1623 i->private_vport_attrs[count] = device_attr_vport_##field; \
1624 if (!i->f->set_vport_##field) { \
1625 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1626 i->private_vport_attrs[count].store = NULL; \
1627 } \
1628 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1629 count++
1630 /* NOTE: Above MACRO differs: does not check show bit */
1631
1632 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field) \
1633 { \
1634 i->private_vport_attrs[count] = device_attr_vport_##field; \
1635 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1636 count++; \
1637 }
1638
1639
1640 /* The FC Transport Virtual Port Attributes: */
1641
1642 /* Fixed Virtual Port Attributes */
1643
1644 /* Dynamic Virtual Port Attributes */
1645
1646 /* Private Virtual Port Attributes */
1647
1648 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1649 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1650 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1651 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1652
1653 static ssize_t
show_fc_vport_roles(struct device * dev,struct device_attribute * attr,char * buf)1654 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1655 char *buf)
1656 {
1657 struct fc_vport *vport = transport_class_to_vport(dev);
1658
1659 if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1660 return snprintf(buf, 20, "unknown\n");
1661 return get_fc_port_roles_names(vport->roles, buf);
1662 }
1663 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1664
1665 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1666
1667 fc_private_vport_show_function(symbolic_name, "%s\n",
1668 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1669 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1670 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1671 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1672
1673 static ssize_t
store_fc_vport_delete(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1674 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1675 const char *buf, size_t count)
1676 {
1677 struct fc_vport *vport = transport_class_to_vport(dev);
1678 struct Scsi_Host *shost = vport_to_shost(vport);
1679 unsigned long flags;
1680
1681 spin_lock_irqsave(shost->host_lock, flags);
1682 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1683 spin_unlock_irqrestore(shost->host_lock, flags);
1684 return -EBUSY;
1685 }
1686 vport->flags |= FC_VPORT_DELETING;
1687 spin_unlock_irqrestore(shost->host_lock, flags);
1688
1689 fc_queue_work(shost, &vport->vport_delete_work);
1690 return count;
1691 }
1692 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1693 NULL, store_fc_vport_delete);
1694
1695
1696 /*
1697 * Enable/Disable vport
1698 * Write "1" to disable, write "0" to enable
1699 */
1700 static ssize_t
store_fc_vport_disable(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1701 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1702 const char *buf,
1703 size_t count)
1704 {
1705 struct fc_vport *vport = transport_class_to_vport(dev);
1706 struct Scsi_Host *shost = vport_to_shost(vport);
1707 struct fc_internal *i = to_fc_internal(shost->transportt);
1708 int stat;
1709
1710 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1711 return -EBUSY;
1712
1713 if (*buf == '0') {
1714 if (vport->vport_state != FC_VPORT_DISABLED)
1715 return -EALREADY;
1716 } else if (*buf == '1') {
1717 if (vport->vport_state == FC_VPORT_DISABLED)
1718 return -EALREADY;
1719 } else
1720 return -EINVAL;
1721
1722 stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1723 return stat ? stat : count;
1724 }
1725 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1726 NULL, store_fc_vport_disable);
1727
1728
1729 /*
1730 * Host Attribute Management
1731 */
1732
1733 #define fc_host_show_function(field, format_string, sz, cast) \
1734 static ssize_t \
1735 show_fc_host_##field (struct device *dev, \
1736 struct device_attribute *attr, char *buf) \
1737 { \
1738 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1739 struct fc_internal *i = to_fc_internal(shost->transportt); \
1740 if (i->f->get_host_##field) \
1741 i->f->get_host_##field(shost); \
1742 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1743 }
1744
1745 #define fc_host_store_function(field) \
1746 static ssize_t \
1747 store_fc_host_##field(struct device *dev, \
1748 struct device_attribute *attr, \
1749 const char *buf, size_t count) \
1750 { \
1751 int val; \
1752 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1753 struct fc_internal *i = to_fc_internal(shost->transportt); \
1754 char *cp; \
1755 \
1756 val = simple_strtoul(buf, &cp, 0); \
1757 if (*cp && (*cp != '\n')) \
1758 return -EINVAL; \
1759 i->f->set_host_##field(shost, val); \
1760 return count; \
1761 }
1762
1763 #define fc_host_store_str_function(field, slen) \
1764 static ssize_t \
1765 store_fc_host_##field(struct device *dev, \
1766 struct device_attribute *attr, \
1767 const char *buf, size_t count) \
1768 { \
1769 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1770 struct fc_internal *i = to_fc_internal(shost->transportt); \
1771 unsigned int cnt=count; \
1772 \
1773 /* count may include a LF at end of string */ \
1774 if (buf[cnt-1] == '\n') \
1775 cnt--; \
1776 if (cnt > ((slen) - 1)) \
1777 return -EINVAL; \
1778 memcpy(fc_host_##field(shost), buf, cnt); \
1779 i->f->set_host_##field(shost); \
1780 return count; \
1781 }
1782
1783 #define fc_host_rd_attr(field, format_string, sz) \
1784 fc_host_show_function(field, format_string, sz, ) \
1785 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1786 show_fc_host_##field, NULL)
1787
1788 #define fc_host_rd_attr_cast(field, format_string, sz, cast) \
1789 fc_host_show_function(field, format_string, sz, (cast)) \
1790 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1791 show_fc_host_##field, NULL)
1792
1793 #define fc_host_rw_attr(field, format_string, sz) \
1794 fc_host_show_function(field, format_string, sz, ) \
1795 fc_host_store_function(field) \
1796 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
1797 show_fc_host_##field, \
1798 store_fc_host_##field)
1799
1800 #define fc_host_rd_enum_attr(title, maxlen) \
1801 static ssize_t \
1802 show_fc_host_##title (struct device *dev, \
1803 struct device_attribute *attr, char *buf) \
1804 { \
1805 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1806 struct fc_internal *i = to_fc_internal(shost->transportt); \
1807 const char *name; \
1808 if (i->f->get_host_##title) \
1809 i->f->get_host_##title(shost); \
1810 name = get_fc_##title##_name(fc_host_##title(shost)); \
1811 if (!name) \
1812 return -EINVAL; \
1813 return snprintf(buf, maxlen, "%s\n", name); \
1814 } \
1815 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1816
1817 #define SETUP_HOST_ATTRIBUTE_RD(field) \
1818 i->private_host_attrs[count] = device_attr_host_##field; \
1819 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1820 i->private_host_attrs[count].store = NULL; \
1821 i->host_attrs[count] = &i->private_host_attrs[count]; \
1822 if (i->f->show_host_##field) \
1823 count++
1824
1825 #define SETUP_HOST_ATTRIBUTE_RD_NS(field) \
1826 i->private_host_attrs[count] = device_attr_host_##field; \
1827 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1828 i->private_host_attrs[count].store = NULL; \
1829 i->host_attrs[count] = &i->private_host_attrs[count]; \
1830 count++
1831
1832 #define SETUP_HOST_ATTRIBUTE_RW(field) \
1833 i->private_host_attrs[count] = device_attr_host_##field; \
1834 if (!i->f->set_host_##field) { \
1835 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1836 i->private_host_attrs[count].store = NULL; \
1837 } \
1838 i->host_attrs[count] = &i->private_host_attrs[count]; \
1839 if (i->f->show_host_##field) \
1840 count++
1841
1842
1843 #define fc_private_host_show_function(field, format_string, sz, cast) \
1844 static ssize_t \
1845 show_fc_host_##field (struct device *dev, \
1846 struct device_attribute *attr, char *buf) \
1847 { \
1848 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1849 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1850 }
1851
1852 #define fc_private_host_rd_attr(field, format_string, sz) \
1853 fc_private_host_show_function(field, format_string, sz, ) \
1854 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1855 show_fc_host_##field, NULL)
1856
1857 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
1858 fc_private_host_show_function(field, format_string, sz, (cast)) \
1859 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1860 show_fc_host_##field, NULL)
1861
1862 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
1863 i->private_host_attrs[count] = device_attr_host_##field; \
1864 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1865 i->private_host_attrs[count].store = NULL; \
1866 i->host_attrs[count] = &i->private_host_attrs[count]; \
1867 count++
1868
1869 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
1870 { \
1871 i->private_host_attrs[count] = device_attr_host_##field; \
1872 i->host_attrs[count] = &i->private_host_attrs[count]; \
1873 count++; \
1874 }
1875
1876
1877 /* Fixed Host Attributes */
1878
1879 static ssize_t
show_fc_host_supported_classes(struct device * dev,struct device_attribute * attr,char * buf)1880 show_fc_host_supported_classes (struct device *dev,
1881 struct device_attribute *attr, char *buf)
1882 {
1883 struct Scsi_Host *shost = transport_class_to_shost(dev);
1884
1885 if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1886 return snprintf(buf, 20, "unspecified\n");
1887
1888 return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1889 }
1890 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1891 show_fc_host_supported_classes, NULL);
1892
1893 static ssize_t
show_fc_host_supported_fc4s(struct device * dev,struct device_attribute * attr,char * buf)1894 show_fc_host_supported_fc4s (struct device *dev,
1895 struct device_attribute *attr, char *buf)
1896 {
1897 struct Scsi_Host *shost = transport_class_to_shost(dev);
1898 return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1899 }
1900 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1901 show_fc_host_supported_fc4s, NULL);
1902
1903 static ssize_t
show_fc_host_supported_speeds(struct device * dev,struct device_attribute * attr,char * buf)1904 show_fc_host_supported_speeds (struct device *dev,
1905 struct device_attribute *attr, char *buf)
1906 {
1907 struct Scsi_Host *shost = transport_class_to_shost(dev);
1908
1909 if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1910 return snprintf(buf, 20, "unknown\n");
1911
1912 return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1913 }
1914 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1915 show_fc_host_supported_speeds, NULL);
1916
1917
1918 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1919 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1920 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1921 unsigned long long);
1922 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1923 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1924 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1925 fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
1926 fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1927 fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1928 fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1929 fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1930 fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1931 fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1932
1933
1934 /* Dynamic Host Attributes */
1935
1936 static ssize_t
show_fc_host_active_fc4s(struct device * dev,struct device_attribute * attr,char * buf)1937 show_fc_host_active_fc4s (struct device *dev,
1938 struct device_attribute *attr, char *buf)
1939 {
1940 struct Scsi_Host *shost = transport_class_to_shost(dev);
1941 struct fc_internal *i = to_fc_internal(shost->transportt);
1942
1943 if (i->f->get_host_active_fc4s)
1944 i->f->get_host_active_fc4s(shost);
1945
1946 return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1947 }
1948 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1949 show_fc_host_active_fc4s, NULL);
1950
1951 static ssize_t
show_fc_host_speed(struct device * dev,struct device_attribute * attr,char * buf)1952 show_fc_host_speed (struct device *dev,
1953 struct device_attribute *attr, char *buf)
1954 {
1955 struct Scsi_Host *shost = transport_class_to_shost(dev);
1956 struct fc_internal *i = to_fc_internal(shost->transportt);
1957
1958 if (i->f->get_host_speed)
1959 i->f->get_host_speed(shost);
1960
1961 if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1962 return snprintf(buf, 20, "unknown\n");
1963
1964 return get_fc_port_speed_names(fc_host_speed(shost), buf);
1965 }
1966 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1967 show_fc_host_speed, NULL);
1968
1969
1970 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1971 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1972 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1973 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1974 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1975
1976 fc_private_host_show_function(system_hostname, "%s\n",
1977 FC_SYMBOLIC_NAME_SIZE + 1, )
1978 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1979 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1980 show_fc_host_system_hostname, store_fc_host_system_hostname);
1981
1982
1983 /* Private Host Attributes */
1984
1985 static ssize_t
show_fc_private_host_tgtid_bind_type(struct device * dev,struct device_attribute * attr,char * buf)1986 show_fc_private_host_tgtid_bind_type(struct device *dev,
1987 struct device_attribute *attr, char *buf)
1988 {
1989 struct Scsi_Host *shost = transport_class_to_shost(dev);
1990 const char *name;
1991
1992 name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1993 if (!name)
1994 return -EINVAL;
1995 return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1996 }
1997
1998 #define get_list_head_entry(pos, head, member) \
1999 pos = list_entry((head)->next, typeof(*pos), member)
2000
2001 static ssize_t
store_fc_private_host_tgtid_bind_type(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2002 store_fc_private_host_tgtid_bind_type(struct device *dev,
2003 struct device_attribute *attr, const char *buf, size_t count)
2004 {
2005 struct Scsi_Host *shost = transport_class_to_shost(dev);
2006 struct fc_rport *rport;
2007 enum fc_tgtid_binding_type val;
2008 unsigned long flags;
2009
2010 if (get_fc_tgtid_bind_type_match(buf, &val))
2011 return -EINVAL;
2012
2013 /* if changing bind type, purge all unused consistent bindings */
2014 if (val != fc_host_tgtid_bind_type(shost)) {
2015 spin_lock_irqsave(shost->host_lock, flags);
2016 while (!list_empty(&fc_host_rport_bindings(shost))) {
2017 get_list_head_entry(rport,
2018 &fc_host_rport_bindings(shost), peers);
2019 list_del(&rport->peers);
2020 rport->port_state = FC_PORTSTATE_DELETED;
2021 fc_queue_work(shost, &rport->rport_delete_work);
2022 }
2023 spin_unlock_irqrestore(shost->host_lock, flags);
2024 }
2025
2026 fc_host_tgtid_bind_type(shost) = val;
2027 return count;
2028 }
2029
2030 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
2031 show_fc_private_host_tgtid_bind_type,
2032 store_fc_private_host_tgtid_bind_type);
2033
2034 static ssize_t
store_fc_private_host_issue_lip(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2035 store_fc_private_host_issue_lip(struct device *dev,
2036 struct device_attribute *attr, const char *buf, size_t count)
2037 {
2038 struct Scsi_Host *shost = transport_class_to_shost(dev);
2039 struct fc_internal *i = to_fc_internal(shost->transportt);
2040 int ret;
2041
2042 /* ignore any data value written to the attribute */
2043 if (i->f->issue_fc_host_lip) {
2044 ret = i->f->issue_fc_host_lip(shost);
2045 return ret ? ret: count;
2046 }
2047
2048 return -ENOENT;
2049 }
2050
2051 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
2052 store_fc_private_host_issue_lip);
2053
2054 static ssize_t
store_fc_private_host_dev_loss_tmo(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2055 store_fc_private_host_dev_loss_tmo(struct device *dev,
2056 struct device_attribute *attr,
2057 const char *buf, size_t count)
2058 {
2059 struct Scsi_Host *shost = transport_class_to_shost(dev);
2060 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2061 struct fc_rport *rport;
2062 unsigned long val, flags;
2063 int rc;
2064
2065 rc = fc_str_to_dev_loss(buf, &val);
2066 if (rc)
2067 return rc;
2068
2069 fc_host_dev_loss_tmo(shost) = val;
2070 spin_lock_irqsave(shost->host_lock, flags);
2071 list_for_each_entry(rport, &fc_host->rports, peers)
2072 fc_rport_set_dev_loss_tmo(rport, val);
2073 spin_unlock_irqrestore(shost->host_lock, flags);
2074 return count;
2075 }
2076
2077 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
2078 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
2079 show_fc_host_dev_loss_tmo,
2080 store_fc_private_host_dev_loss_tmo);
2081
2082 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
2083
2084 /*
2085 * Host Statistics Management
2086 */
2087
2088 /* Show a given attribute in the statistics group */
2089 static ssize_t
fc_stat_show(const struct device * dev,char * buf,unsigned long offset)2090 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
2091 {
2092 struct Scsi_Host *shost = transport_class_to_shost(dev);
2093 struct fc_internal *i = to_fc_internal(shost->transportt);
2094 struct fc_host_statistics *stats;
2095 ssize_t ret = -ENOENT;
2096
2097 if (offset > sizeof(struct fc_host_statistics) ||
2098 offset % sizeof(u64) != 0)
2099 WARN_ON(1);
2100
2101 if (i->f->get_fc_host_stats) {
2102 stats = (i->f->get_fc_host_stats)(shost);
2103 if (stats)
2104 ret = snprintf(buf, 20, "0x%llx\n",
2105 (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
2106 }
2107 return ret;
2108 }
2109
2110
2111 /* generate a read-only statistics attribute */
2112 #define fc_host_statistic(name) \
2113 static ssize_t show_fcstat_##name(struct device *cd, \
2114 struct device_attribute *attr, \
2115 char *buf) \
2116 { \
2117 return fc_stat_show(cd, buf, \
2118 offsetof(struct fc_host_statistics, name)); \
2119 } \
2120 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
2121
2122 fc_host_statistic(seconds_since_last_reset);
2123 fc_host_statistic(tx_frames);
2124 fc_host_statistic(tx_words);
2125 fc_host_statistic(rx_frames);
2126 fc_host_statistic(rx_words);
2127 fc_host_statistic(lip_count);
2128 fc_host_statistic(nos_count);
2129 fc_host_statistic(error_frames);
2130 fc_host_statistic(dumped_frames);
2131 fc_host_statistic(link_failure_count);
2132 fc_host_statistic(loss_of_sync_count);
2133 fc_host_statistic(loss_of_signal_count);
2134 fc_host_statistic(prim_seq_protocol_err_count);
2135 fc_host_statistic(invalid_tx_word_count);
2136 fc_host_statistic(invalid_crc_count);
2137 fc_host_statistic(fcp_input_requests);
2138 fc_host_statistic(fcp_output_requests);
2139 fc_host_statistic(fcp_control_requests);
2140 fc_host_statistic(fcp_input_megabytes);
2141 fc_host_statistic(fcp_output_megabytes);
2142 fc_host_statistic(fcp_packet_alloc_failures);
2143 fc_host_statistic(fcp_packet_aborts);
2144 fc_host_statistic(fcp_frame_alloc_failures);
2145 fc_host_statistic(fc_no_free_exch);
2146 fc_host_statistic(fc_no_free_exch_xid);
2147 fc_host_statistic(fc_xid_not_found);
2148 fc_host_statistic(fc_xid_busy);
2149 fc_host_statistic(fc_seq_not_found);
2150 fc_host_statistic(fc_non_bls_resp);
2151 fc_host_statistic(cn_sig_warn);
2152 fc_host_statistic(cn_sig_alarm);
2153
2154
2155 #define fc_host_fpin_statistic(name) \
2156 static ssize_t fc_host_fpinstat_##name(struct device *cd, \
2157 struct device_attribute *attr, \
2158 char *buf) \
2159 { \
2160 struct Scsi_Host *shost = transport_class_to_shost(cd); \
2161 struct fc_host_attrs *fc_host = shost_to_fc_host(shost); \
2162 \
2163 return snprintf(buf, 20, "0x%llx\n", fc_host->fpin_stats.name); \
2164 } \
2165 static FC_DEVICE_ATTR(host, fpin_##name, 0444, fc_host_fpinstat_##name, NULL)
2166
2167 fc_host_fpin_statistic(dn);
2168 fc_host_fpin_statistic(dn_unknown);
2169 fc_host_fpin_statistic(dn_timeout);
2170 fc_host_fpin_statistic(dn_unable_to_route);
2171 fc_host_fpin_statistic(dn_device_specific);
2172 fc_host_fpin_statistic(cn);
2173 fc_host_fpin_statistic(cn_clear);
2174 fc_host_fpin_statistic(cn_lost_credit);
2175 fc_host_fpin_statistic(cn_credit_stall);
2176 fc_host_fpin_statistic(cn_oversubscription);
2177 fc_host_fpin_statistic(cn_device_specific);
2178 fc_host_fpin_statistic(li);
2179 fc_host_fpin_statistic(li_failure_unknown);
2180 fc_host_fpin_statistic(li_link_failure_count);
2181 fc_host_fpin_statistic(li_loss_of_sync_count);
2182 fc_host_fpin_statistic(li_loss_of_signals_count);
2183 fc_host_fpin_statistic(li_prim_seq_err_count);
2184 fc_host_fpin_statistic(li_invalid_tx_word_count);
2185 fc_host_fpin_statistic(li_invalid_crc_count);
2186 fc_host_fpin_statistic(li_device_specific);
2187
2188 static ssize_t
fc_reset_statistics(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2189 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
2190 const char *buf, size_t count)
2191 {
2192 struct Scsi_Host *shost = transport_class_to_shost(dev);
2193 struct fc_internal *i = to_fc_internal(shost->transportt);
2194
2195 /* ignore any data value written to the attribute */
2196 if (i->f->reset_fc_host_stats) {
2197 i->f->reset_fc_host_stats(shost);
2198 return count;
2199 }
2200
2201 return -ENOENT;
2202 }
2203 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
2204 fc_reset_statistics);
2205
2206 static struct attribute *fc_statistics_attrs[] = {
2207 &device_attr_host_seconds_since_last_reset.attr,
2208 &device_attr_host_tx_frames.attr,
2209 &device_attr_host_tx_words.attr,
2210 &device_attr_host_rx_frames.attr,
2211 &device_attr_host_rx_words.attr,
2212 &device_attr_host_lip_count.attr,
2213 &device_attr_host_nos_count.attr,
2214 &device_attr_host_error_frames.attr,
2215 &device_attr_host_dumped_frames.attr,
2216 &device_attr_host_link_failure_count.attr,
2217 &device_attr_host_loss_of_sync_count.attr,
2218 &device_attr_host_loss_of_signal_count.attr,
2219 &device_attr_host_prim_seq_protocol_err_count.attr,
2220 &device_attr_host_invalid_tx_word_count.attr,
2221 &device_attr_host_invalid_crc_count.attr,
2222 &device_attr_host_fcp_input_requests.attr,
2223 &device_attr_host_fcp_output_requests.attr,
2224 &device_attr_host_fcp_control_requests.attr,
2225 &device_attr_host_fcp_input_megabytes.attr,
2226 &device_attr_host_fcp_output_megabytes.attr,
2227 &device_attr_host_fcp_packet_alloc_failures.attr,
2228 &device_attr_host_fcp_packet_aborts.attr,
2229 &device_attr_host_fcp_frame_alloc_failures.attr,
2230 &device_attr_host_fc_no_free_exch.attr,
2231 &device_attr_host_fc_no_free_exch_xid.attr,
2232 &device_attr_host_fc_xid_not_found.attr,
2233 &device_attr_host_fc_xid_busy.attr,
2234 &device_attr_host_fc_seq_not_found.attr,
2235 &device_attr_host_fc_non_bls_resp.attr,
2236 &device_attr_host_cn_sig_warn.attr,
2237 &device_attr_host_cn_sig_alarm.attr,
2238 &device_attr_host_reset_statistics.attr,
2239 &device_attr_host_fpin_dn.attr,
2240 &device_attr_host_fpin_dn_unknown.attr,
2241 &device_attr_host_fpin_dn_timeout.attr,
2242 &device_attr_host_fpin_dn_unable_to_route.attr,
2243 &device_attr_host_fpin_dn_device_specific.attr,
2244 &device_attr_host_fpin_li.attr,
2245 &device_attr_host_fpin_li_failure_unknown.attr,
2246 &device_attr_host_fpin_li_link_failure_count.attr,
2247 &device_attr_host_fpin_li_loss_of_sync_count.attr,
2248 &device_attr_host_fpin_li_loss_of_signals_count.attr,
2249 &device_attr_host_fpin_li_prim_seq_err_count.attr,
2250 &device_attr_host_fpin_li_invalid_tx_word_count.attr,
2251 &device_attr_host_fpin_li_invalid_crc_count.attr,
2252 &device_attr_host_fpin_li_device_specific.attr,
2253 &device_attr_host_fpin_cn.attr,
2254 &device_attr_host_fpin_cn_clear.attr,
2255 &device_attr_host_fpin_cn_lost_credit.attr,
2256 &device_attr_host_fpin_cn_credit_stall.attr,
2257 &device_attr_host_fpin_cn_oversubscription.attr,
2258 &device_attr_host_fpin_cn_device_specific.attr,
2259 NULL
2260 };
2261
2262 static struct attribute_group fc_statistics_group = {
2263 .name = "statistics",
2264 .attrs = fc_statistics_attrs,
2265 };
2266
2267
2268 /* Host Vport Attributes */
2269
2270 static int
fc_parse_wwn(const char * ns,u64 * nm)2271 fc_parse_wwn(const char *ns, u64 *nm)
2272 {
2273 unsigned int i, j;
2274 u8 wwn[8];
2275
2276 memset(wwn, 0, sizeof(wwn));
2277
2278 /* Validate and store the new name */
2279 for (i=0, j=0; i < 16; i++) {
2280 int value;
2281
2282 value = hex_to_bin(*ns++);
2283 if (value >= 0)
2284 j = (j << 4) | value;
2285 else
2286 return -EINVAL;
2287 if (i % 2) {
2288 wwn[i/2] = j & 0xff;
2289 j = 0;
2290 }
2291 }
2292
2293 *nm = wwn_to_u64(wwn);
2294
2295 return 0;
2296 }
2297
2298
2299 /*
2300 * "Short-cut" sysfs variable to create a new vport on a FC Host.
2301 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
2302 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
2303 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
2304 */
2305 static ssize_t
store_fc_host_vport_create(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2306 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
2307 const char *buf, size_t count)
2308 {
2309 struct Scsi_Host *shost = transport_class_to_shost(dev);
2310 struct fc_vport_identifiers vid;
2311 struct fc_vport *vport;
2312 unsigned int cnt=count;
2313 int stat;
2314
2315 memset(&vid, 0, sizeof(vid));
2316
2317 /* count may include a LF at end of string */
2318 if (buf[cnt-1] == '\n')
2319 cnt--;
2320
2321 /* validate we have enough characters for WWPN */
2322 if ((cnt != (16+1+16)) || (buf[16] != ':'))
2323 return -EINVAL;
2324
2325 stat = fc_parse_wwn(&buf[0], &vid.port_name);
2326 if (stat)
2327 return stat;
2328
2329 stat = fc_parse_wwn(&buf[17], &vid.node_name);
2330 if (stat)
2331 return stat;
2332
2333 vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
2334 vid.vport_type = FC_PORTTYPE_NPIV;
2335 /* vid.symbolic_name is already zero/NULL's */
2336 vid.disable = false; /* always enabled */
2337
2338 /* we only allow support on Channel 0 !!! */
2339 stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
2340 return stat ? stat : count;
2341 }
2342 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
2343 store_fc_host_vport_create);
2344
2345
2346 /*
2347 * "Short-cut" sysfs variable to delete a vport on a FC Host.
2348 * Vport is identified by a string containing "<WWPN>:<WWNN>".
2349 * The WWNs are specified as hex characters, and may *not* contain
2350 * any prefixes (e.g. 0x, x, etc)
2351 */
2352 static ssize_t
store_fc_host_vport_delete(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2353 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
2354 const char *buf, size_t count)
2355 {
2356 struct Scsi_Host *shost = transport_class_to_shost(dev);
2357 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2358 struct fc_vport *vport;
2359 u64 wwpn, wwnn;
2360 unsigned long flags;
2361 unsigned int cnt=count;
2362 int stat, match;
2363
2364 /* count may include a LF at end of string */
2365 if (buf[cnt-1] == '\n')
2366 cnt--;
2367
2368 /* validate we have enough characters for WWPN */
2369 if ((cnt != (16+1+16)) || (buf[16] != ':'))
2370 return -EINVAL;
2371
2372 stat = fc_parse_wwn(&buf[0], &wwpn);
2373 if (stat)
2374 return stat;
2375
2376 stat = fc_parse_wwn(&buf[17], &wwnn);
2377 if (stat)
2378 return stat;
2379
2380 spin_lock_irqsave(shost->host_lock, flags);
2381 match = 0;
2382 /* we only allow support on Channel 0 !!! */
2383 list_for_each_entry(vport, &fc_host->vports, peers) {
2384 if ((vport->channel == 0) &&
2385 (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
2386 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
2387 break;
2388 vport->flags |= FC_VPORT_DELETING;
2389 match = 1;
2390 break;
2391 }
2392 }
2393 spin_unlock_irqrestore(shost->host_lock, flags);
2394
2395 if (!match)
2396 return -ENODEV;
2397
2398 stat = fc_vport_terminate(vport);
2399 return stat ? stat : count;
2400 }
2401 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
2402 store_fc_host_vport_delete);
2403
2404
fc_host_match(struct attribute_container * cont,struct device * dev)2405 static int fc_host_match(struct attribute_container *cont,
2406 struct device *dev)
2407 {
2408 struct Scsi_Host *shost;
2409 struct fc_internal *i;
2410
2411 if (!scsi_is_host_device(dev))
2412 return 0;
2413
2414 shost = dev_to_shost(dev);
2415 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2416 != &fc_host_class.class)
2417 return 0;
2418
2419 i = to_fc_internal(shost->transportt);
2420
2421 return &i->t.host_attrs.ac == cont;
2422 }
2423
fc_target_match(struct attribute_container * cont,struct device * dev)2424 static int fc_target_match(struct attribute_container *cont,
2425 struct device *dev)
2426 {
2427 struct Scsi_Host *shost;
2428 struct fc_internal *i;
2429
2430 if (!scsi_is_target_device(dev))
2431 return 0;
2432
2433 shost = dev_to_shost(dev->parent);
2434 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2435 != &fc_host_class.class)
2436 return 0;
2437
2438 i = to_fc_internal(shost->transportt);
2439
2440 return &i->t.target_attrs.ac == cont;
2441 }
2442
fc_rport_dev_release(struct device * dev)2443 static void fc_rport_dev_release(struct device *dev)
2444 {
2445 struct fc_rport *rport = dev_to_rport(dev);
2446 put_device(dev->parent);
2447 kfree(rport);
2448 }
2449
scsi_is_fc_rport(const struct device * dev)2450 int scsi_is_fc_rport(const struct device *dev)
2451 {
2452 return dev->release == fc_rport_dev_release;
2453 }
2454 EXPORT_SYMBOL(scsi_is_fc_rport);
2455
fc_rport_match(struct attribute_container * cont,struct device * dev)2456 static int fc_rport_match(struct attribute_container *cont,
2457 struct device *dev)
2458 {
2459 struct Scsi_Host *shost;
2460 struct fc_internal *i;
2461
2462 if (!scsi_is_fc_rport(dev))
2463 return 0;
2464
2465 shost = dev_to_shost(dev->parent);
2466 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2467 != &fc_host_class.class)
2468 return 0;
2469
2470 i = to_fc_internal(shost->transportt);
2471
2472 return &i->rport_attr_cont.ac == cont;
2473 }
2474
2475
fc_vport_dev_release(struct device * dev)2476 static void fc_vport_dev_release(struct device *dev)
2477 {
2478 struct fc_vport *vport = dev_to_vport(dev);
2479 put_device(dev->parent); /* release kobj parent */
2480 kfree(vport);
2481 }
2482
scsi_is_fc_vport(const struct device * dev)2483 static int scsi_is_fc_vport(const struct device *dev)
2484 {
2485 return dev->release == fc_vport_dev_release;
2486 }
2487
fc_vport_match(struct attribute_container * cont,struct device * dev)2488 static int fc_vport_match(struct attribute_container *cont,
2489 struct device *dev)
2490 {
2491 struct fc_vport *vport;
2492 struct Scsi_Host *shost;
2493 struct fc_internal *i;
2494
2495 if (!scsi_is_fc_vport(dev))
2496 return 0;
2497 vport = dev_to_vport(dev);
2498
2499 shost = vport_to_shost(vport);
2500 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2501 != &fc_host_class.class)
2502 return 0;
2503
2504 i = to_fc_internal(shost->transportt);
2505 return &i->vport_attr_cont.ac == cont;
2506 }
2507
2508
2509 /**
2510 * fc_eh_timed_out - FC Transport I/O timeout intercept handler
2511 * @scmd: The SCSI command which timed out
2512 *
2513 * This routine protects against error handlers getting invoked while a
2514 * rport is in a blocked state, typically due to a temporarily loss of
2515 * connectivity. If the error handlers are allowed to proceed, requests
2516 * to abort i/o, reset the target, etc will likely fail as there is no way
2517 * to communicate with the device to perform the requested function. These
2518 * failures may result in the midlayer taking the device offline, requiring
2519 * manual intervention to restore operation.
2520 *
2521 * This routine, called whenever an i/o times out, validates the state of
2522 * the underlying rport. If the rport is blocked, it returns
2523 * EH_RESET_TIMER, which will continue to reschedule the timeout.
2524 * Eventually, either the device will return, or devloss_tmo will fire,
2525 * and when the timeout then fires, it will be handled normally.
2526 * If the rport is not blocked, normal error handling continues.
2527 *
2528 * Notes:
2529 * This routine assumes no locks are held on entry.
2530 */
fc_eh_timed_out(struct scsi_cmnd * scmd)2531 enum scsi_timeout_action fc_eh_timed_out(struct scsi_cmnd *scmd)
2532 {
2533 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2534
2535 if (rport->port_state == FC_PORTSTATE_BLOCKED)
2536 return SCSI_EH_RESET_TIMER;
2537
2538 return SCSI_EH_NOT_HANDLED;
2539 }
2540 EXPORT_SYMBOL(fc_eh_timed_out);
2541
2542 /*
2543 * Called by fc_user_scan to locate an rport on the shost that
2544 * matches the channel and target id, and invoke scsi_scan_target()
2545 * on the rport.
2546 */
2547 static void
fc_user_scan_tgt(struct Scsi_Host * shost,uint channel,uint id,u64 lun)2548 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2549 {
2550 struct fc_rport *rport;
2551 unsigned long flags;
2552
2553 spin_lock_irqsave(shost->host_lock, flags);
2554
2555 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2556 if (rport->scsi_target_id == -1)
2557 continue;
2558
2559 if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
2560 (rport->port_state != FC_PORTSTATE_MARGINAL))
2561 continue;
2562
2563 if ((channel == rport->channel) &&
2564 (id == rport->scsi_target_id)) {
2565 spin_unlock_irqrestore(shost->host_lock, flags);
2566 scsi_scan_target(&rport->dev, channel, id, lun,
2567 SCSI_SCAN_MANUAL);
2568 return;
2569 }
2570 }
2571
2572 spin_unlock_irqrestore(shost->host_lock, flags);
2573 }
2574
2575 /*
2576 * Called via sysfs scan routines. Necessary, as the FC transport
2577 * wants to place all target objects below the rport object. So this
2578 * routine must invoke the scsi_scan_target() routine with the rport
2579 * object as the parent.
2580 */
2581 static int
fc_user_scan(struct Scsi_Host * shost,uint channel,uint id,u64 lun)2582 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2583 {
2584 uint chlo, chhi;
2585 uint tgtlo, tgthi;
2586
2587 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2588 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2589 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2590 return -EINVAL;
2591
2592 if (channel == SCAN_WILD_CARD) {
2593 chlo = 0;
2594 chhi = shost->max_channel + 1;
2595 } else {
2596 chlo = channel;
2597 chhi = channel + 1;
2598 }
2599
2600 if (id == SCAN_WILD_CARD) {
2601 tgtlo = 0;
2602 tgthi = shost->max_id;
2603 } else {
2604 tgtlo = id;
2605 tgthi = id + 1;
2606 }
2607
2608 for ( ; chlo < chhi; chlo++)
2609 for ( ; tgtlo < tgthi; tgtlo++)
2610 fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2611
2612 return 0;
2613 }
2614
2615 struct scsi_transport_template *
fc_attach_transport(struct fc_function_template * ft)2616 fc_attach_transport(struct fc_function_template *ft)
2617 {
2618 int count;
2619 struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2620 GFP_KERNEL);
2621
2622 if (unlikely(!i))
2623 return NULL;
2624
2625 i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2626 i->t.target_attrs.ac.class = &fc_transport_class.class;
2627 i->t.target_attrs.ac.match = fc_target_match;
2628 i->t.target_size = sizeof(struct fc_starget_attrs);
2629 transport_container_register(&i->t.target_attrs);
2630
2631 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2632 i->t.host_attrs.ac.class = &fc_host_class.class;
2633 i->t.host_attrs.ac.match = fc_host_match;
2634 i->t.host_size = sizeof(struct fc_host_attrs);
2635 if (ft->get_fc_host_stats)
2636 i->t.host_attrs.statistics = &fc_statistics_group;
2637 transport_container_register(&i->t.host_attrs);
2638
2639 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2640 i->rport_attr_cont.ac.class = &fc_rport_class.class;
2641 i->rport_attr_cont.ac.match = fc_rport_match;
2642 i->rport_attr_cont.statistics = &fc_rport_statistics_group;
2643 transport_container_register(&i->rport_attr_cont);
2644
2645 i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2646 i->vport_attr_cont.ac.class = &fc_vport_class.class;
2647 i->vport_attr_cont.ac.match = fc_vport_match;
2648 transport_container_register(&i->vport_attr_cont);
2649
2650 i->f = ft;
2651
2652 /* Transport uses the shost workq for scsi scanning */
2653 i->t.create_work_queue = 1;
2654
2655 i->t.user_scan = fc_user_scan;
2656
2657 /*
2658 * Setup SCSI Target Attributes.
2659 */
2660 count = 0;
2661 SETUP_STARGET_ATTRIBUTE_RD(node_name);
2662 SETUP_STARGET_ATTRIBUTE_RD(port_name);
2663 SETUP_STARGET_ATTRIBUTE_RD(port_id);
2664
2665 BUG_ON(count > FC_STARGET_NUM_ATTRS);
2666
2667 i->starget_attrs[count] = NULL;
2668
2669
2670 /*
2671 * Setup SCSI Host Attributes.
2672 */
2673 count=0;
2674 SETUP_HOST_ATTRIBUTE_RD(node_name);
2675 SETUP_HOST_ATTRIBUTE_RD(port_name);
2676 SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2677 SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2678 SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2679 SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2680 SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2681 if (ft->vport_create) {
2682 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2683 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2684 }
2685 SETUP_HOST_ATTRIBUTE_RD(serial_number);
2686 SETUP_HOST_ATTRIBUTE_RD(manufacturer);
2687 SETUP_HOST_ATTRIBUTE_RD(model);
2688 SETUP_HOST_ATTRIBUTE_RD(model_description);
2689 SETUP_HOST_ATTRIBUTE_RD(hardware_version);
2690 SETUP_HOST_ATTRIBUTE_RD(driver_version);
2691 SETUP_HOST_ATTRIBUTE_RD(firmware_version);
2692 SETUP_HOST_ATTRIBUTE_RD(optionrom_version);
2693
2694 SETUP_HOST_ATTRIBUTE_RD(port_id);
2695 SETUP_HOST_ATTRIBUTE_RD(port_type);
2696 SETUP_HOST_ATTRIBUTE_RD(port_state);
2697 SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2698 SETUP_HOST_ATTRIBUTE_RD(speed);
2699 SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2700 SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2701 SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2702
2703 /* Transport-managed attributes */
2704 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2705 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2706 if (ft->issue_fc_host_lip)
2707 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2708 if (ft->vport_create)
2709 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2710 if (ft->vport_delete)
2711 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2712
2713 BUG_ON(count > FC_HOST_NUM_ATTRS);
2714
2715 i->host_attrs[count] = NULL;
2716
2717 /*
2718 * Setup Remote Port Attributes.
2719 */
2720 count=0;
2721 SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2722 SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2723 SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2724 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2725 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2726 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2727 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2728 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(port_state);
2729 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2730 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2731
2732 BUG_ON(count > FC_RPORT_NUM_ATTRS);
2733
2734 i->rport_attrs[count] = NULL;
2735
2736 /*
2737 * Setup Virtual Port Attributes.
2738 */
2739 count=0;
2740 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2741 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2742 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2743 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2744 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2745 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2746 SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2747 SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2748 SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2749
2750 BUG_ON(count > FC_VPORT_NUM_ATTRS);
2751
2752 i->vport_attrs[count] = NULL;
2753
2754 return &i->t;
2755 }
2756 EXPORT_SYMBOL(fc_attach_transport);
2757
fc_release_transport(struct scsi_transport_template * t)2758 void fc_release_transport(struct scsi_transport_template *t)
2759 {
2760 struct fc_internal *i = to_fc_internal(t);
2761
2762 transport_container_unregister(&i->t.target_attrs);
2763 transport_container_unregister(&i->t.host_attrs);
2764 transport_container_unregister(&i->rport_attr_cont);
2765 transport_container_unregister(&i->vport_attr_cont);
2766
2767 kfree(i);
2768 }
2769 EXPORT_SYMBOL(fc_release_transport);
2770
2771 /**
2772 * fc_queue_work - Queue work to the fc_host workqueue.
2773 * @shost: Pointer to Scsi_Host bound to fc_host.
2774 * @work: Work to queue for execution.
2775 *
2776 * Return value:
2777 * 1 - work queued for execution
2778 * 0 - work is already queued
2779 * -EINVAL - work queue doesn't exist
2780 */
2781 static int
fc_queue_work(struct Scsi_Host * shost,struct work_struct * work)2782 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2783 {
2784 if (unlikely(!fc_host_work_q(shost))) {
2785 printk(KERN_ERR
2786 "ERROR: FC host '%s' attempted to queue work, "
2787 "when no workqueue created.\n", shost->hostt->name);
2788 dump_stack();
2789
2790 return -EINVAL;
2791 }
2792
2793 return queue_work(fc_host_work_q(shost), work);
2794 }
2795
2796 /**
2797 * fc_flush_work - Flush a fc_host's workqueue.
2798 * @shost: Pointer to Scsi_Host bound to fc_host.
2799 */
2800 static void
fc_flush_work(struct Scsi_Host * shost)2801 fc_flush_work(struct Scsi_Host *shost)
2802 {
2803 if (!fc_host_work_q(shost)) {
2804 printk(KERN_ERR
2805 "ERROR: FC host '%s' attempted to flush work, "
2806 "when no workqueue created.\n", shost->hostt->name);
2807 dump_stack();
2808 return;
2809 }
2810
2811 flush_workqueue(fc_host_work_q(shost));
2812 }
2813
2814 /**
2815 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2816 * @shost: Pointer to Scsi_Host bound to fc_host.
2817 * @work: Work to queue for execution.
2818 * @delay: jiffies to delay the work queuing
2819 *
2820 * Return value:
2821 * 1 on success / 0 already queued / < 0 for error
2822 */
2823 static int
fc_queue_devloss_work(struct Scsi_Host * shost,struct delayed_work * work,unsigned long delay)2824 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2825 unsigned long delay)
2826 {
2827 if (unlikely(!fc_host_devloss_work_q(shost))) {
2828 printk(KERN_ERR
2829 "ERROR: FC host '%s' attempted to queue work, "
2830 "when no workqueue created.\n", shost->hostt->name);
2831 dump_stack();
2832
2833 return -EINVAL;
2834 }
2835
2836 return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2837 }
2838
2839 /**
2840 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2841 * @shost: Pointer to Scsi_Host bound to fc_host.
2842 */
2843 static void
fc_flush_devloss(struct Scsi_Host * shost)2844 fc_flush_devloss(struct Scsi_Host *shost)
2845 {
2846 if (!fc_host_devloss_work_q(shost)) {
2847 printk(KERN_ERR
2848 "ERROR: FC host '%s' attempted to flush work, "
2849 "when no workqueue created.\n", shost->hostt->name);
2850 dump_stack();
2851 return;
2852 }
2853
2854 flush_workqueue(fc_host_devloss_work_q(shost));
2855 }
2856
2857
2858 /**
2859 * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2860 * @shost: Which &Scsi_Host
2861 *
2862 * This routine is expected to be called immediately preceding the
2863 * a driver's call to scsi_remove_host().
2864 *
2865 * WARNING: A driver utilizing the fc_transport, which fails to call
2866 * this routine prior to scsi_remove_host(), will leave dangling
2867 * objects in /sys/class/fc_remote_ports. Access to any of these
2868 * objects can result in a system crash !!!
2869 *
2870 * Notes:
2871 * This routine assumes no locks are held on entry.
2872 */
2873 void
fc_remove_host(struct Scsi_Host * shost)2874 fc_remove_host(struct Scsi_Host *shost)
2875 {
2876 struct fc_vport *vport = NULL, *next_vport = NULL;
2877 struct fc_rport *rport = NULL, *next_rport = NULL;
2878 struct workqueue_struct *work_q;
2879 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2880 unsigned long flags;
2881
2882 spin_lock_irqsave(shost->host_lock, flags);
2883
2884 /* Remove any vports */
2885 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2886 vport->flags |= FC_VPORT_DELETING;
2887 fc_queue_work(shost, &vport->vport_delete_work);
2888 }
2889
2890 /* Remove any remote ports */
2891 list_for_each_entry_safe(rport, next_rport,
2892 &fc_host->rports, peers) {
2893 list_del(&rport->peers);
2894 rport->port_state = FC_PORTSTATE_DELETED;
2895 fc_queue_work(shost, &rport->rport_delete_work);
2896 }
2897
2898 list_for_each_entry_safe(rport, next_rport,
2899 &fc_host->rport_bindings, peers) {
2900 list_del(&rport->peers);
2901 rport->port_state = FC_PORTSTATE_DELETED;
2902 fc_queue_work(shost, &rport->rport_delete_work);
2903 }
2904
2905 spin_unlock_irqrestore(shost->host_lock, flags);
2906
2907 /* flush all scan work items */
2908 scsi_flush_work(shost);
2909
2910 /* flush all stgt delete, and rport delete work items, then kill it */
2911 if (fc_host->work_q) {
2912 work_q = fc_host->work_q;
2913 fc_host->work_q = NULL;
2914 destroy_workqueue(work_q);
2915 }
2916
2917 /* flush all devloss work items, then kill it */
2918 if (fc_host->devloss_work_q) {
2919 work_q = fc_host->devloss_work_q;
2920 fc_host->devloss_work_q = NULL;
2921 destroy_workqueue(work_q);
2922 }
2923 }
2924 EXPORT_SYMBOL(fc_remove_host);
2925
fc_terminate_rport_io(struct fc_rport * rport)2926 static void fc_terminate_rport_io(struct fc_rport *rport)
2927 {
2928 struct Scsi_Host *shost = rport_to_shost(rport);
2929 struct fc_internal *i = to_fc_internal(shost->transportt);
2930
2931 /* Involve the LLDD if possible to terminate all io on the rport. */
2932 if (i->f->terminate_rport_io)
2933 i->f->terminate_rport_io(rport);
2934
2935 /*
2936 * Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
2937 */
2938 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
2939 }
2940
2941 /**
2942 * fc_starget_delete - called to delete the scsi descendants of an rport
2943 * @work: remote port to be operated on.
2944 *
2945 * Deletes target and all sdevs.
2946 */
2947 static void
fc_starget_delete(struct work_struct * work)2948 fc_starget_delete(struct work_struct *work)
2949 {
2950 struct fc_rport *rport =
2951 container_of(work, struct fc_rport, stgt_delete_work);
2952
2953 fc_terminate_rport_io(rport);
2954 scsi_remove_target(&rport->dev);
2955 }
2956
2957
2958 /**
2959 * fc_rport_final_delete - finish rport termination and delete it.
2960 * @work: remote port to be deleted.
2961 */
2962 static void
fc_rport_final_delete(struct work_struct * work)2963 fc_rport_final_delete(struct work_struct *work)
2964 {
2965 struct fc_rport *rport =
2966 container_of(work, struct fc_rport, rport_delete_work);
2967 struct device *dev = &rport->dev;
2968 struct Scsi_Host *shost = rport_to_shost(rport);
2969 struct fc_internal *i = to_fc_internal(shost->transportt);
2970 unsigned long flags;
2971 int do_callback = 0;
2972
2973 fc_terminate_rport_io(rport);
2974
2975 /*
2976 * if a scan is pending, flush the SCSI Host work_q so that
2977 * that we can reclaim the rport scan work element.
2978 */
2979 if (rport->flags & FC_RPORT_SCAN_PENDING)
2980 scsi_flush_work(shost);
2981
2982 /*
2983 * Cancel any outstanding timers. These should really exist
2984 * only when rmmod'ing the LLDD and we're asking for
2985 * immediate termination of the rports
2986 */
2987 spin_lock_irqsave(shost->host_lock, flags);
2988 if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2989 spin_unlock_irqrestore(shost->host_lock, flags);
2990 if (!cancel_delayed_work(&rport->fail_io_work))
2991 fc_flush_devloss(shost);
2992 if (!cancel_delayed_work(&rport->dev_loss_work))
2993 fc_flush_devloss(shost);
2994 cancel_work_sync(&rport->scan_work);
2995 spin_lock_irqsave(shost->host_lock, flags);
2996 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2997 }
2998 spin_unlock_irqrestore(shost->host_lock, flags);
2999
3000 /* Delete SCSI target and sdevs */
3001 if (rport->scsi_target_id != -1)
3002 fc_starget_delete(&rport->stgt_delete_work);
3003
3004 /*
3005 * Notify the driver that the rport is now dead. The LLDD will
3006 * also guarantee that any communication to the rport is terminated
3007 *
3008 * Avoid this call if we already called it when we preserved the
3009 * rport for the binding.
3010 */
3011 spin_lock_irqsave(shost->host_lock, flags);
3012 if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
3013 (i->f->dev_loss_tmo_callbk)) {
3014 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3015 do_callback = 1;
3016 }
3017 spin_unlock_irqrestore(shost->host_lock, flags);
3018
3019 if (do_callback)
3020 i->f->dev_loss_tmo_callbk(rport);
3021
3022 fc_bsg_remove(rport->rqst_q);
3023
3024 transport_remove_device(dev);
3025 device_del(dev);
3026 transport_destroy_device(dev);
3027 scsi_host_put(shost); /* for fc_host->rport list */
3028 put_device(dev); /* for self-reference */
3029 }
3030
3031
3032 /**
3033 * fc_remote_port_create - allocates and creates a remote FC port.
3034 * @shost: scsi host the remote port is connected to.
3035 * @channel: Channel on shost port connected to.
3036 * @ids: The world wide names, fc address, and FC4 port
3037 * roles for the remote port.
3038 *
3039 * Allocates and creates the remoter port structure, including the
3040 * class and sysfs creation.
3041 *
3042 * Notes:
3043 * This routine assumes no locks are held on entry.
3044 */
3045 static struct fc_rport *
fc_remote_port_create(struct Scsi_Host * shost,int channel,struct fc_rport_identifiers * ids)3046 fc_remote_port_create(struct Scsi_Host *shost, int channel,
3047 struct fc_rport_identifiers *ids)
3048 {
3049 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3050 struct fc_internal *fci = to_fc_internal(shost->transportt);
3051 struct fc_rport *rport;
3052 struct device *dev;
3053 unsigned long flags;
3054 int error;
3055 size_t size;
3056
3057 size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
3058 rport = kzalloc(size, GFP_KERNEL);
3059 if (unlikely(!rport)) {
3060 printk(KERN_ERR "%s: allocation failure\n", __func__);
3061 return NULL;
3062 }
3063
3064 rport->maxframe_size = -1;
3065 rport->supported_classes = FC_COS_UNSPECIFIED;
3066 rport->dev_loss_tmo = fc_host->dev_loss_tmo;
3067 memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
3068 memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
3069 rport->port_id = ids->port_id;
3070 rport->roles = ids->roles;
3071 rport->port_state = FC_PORTSTATE_ONLINE;
3072 if (fci->f->dd_fcrport_size)
3073 rport->dd_data = &rport[1];
3074 rport->channel = channel;
3075 rport->fast_io_fail_tmo = -1;
3076
3077 INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
3078 INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
3079 INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
3080 INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
3081 INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
3082
3083 spin_lock_irqsave(shost->host_lock, flags);
3084
3085 rport->number = fc_host->next_rport_number++;
3086 if ((rport->roles & FC_PORT_ROLE_FCP_TARGET) ||
3087 (rport->roles & FC_PORT_ROLE_FCP_DUMMY_INITIATOR))
3088 rport->scsi_target_id = fc_host->next_target_id++;
3089 else
3090 rport->scsi_target_id = -1;
3091 list_add_tail(&rport->peers, &fc_host->rports);
3092 scsi_host_get(shost); /* for fc_host->rport list */
3093
3094 spin_unlock_irqrestore(shost->host_lock, flags);
3095
3096 dev = &rport->dev;
3097 device_initialize(dev); /* takes self reference */
3098 dev->parent = get_device(&shost->shost_gendev); /* parent reference */
3099 dev->release = fc_rport_dev_release;
3100 dev_set_name(dev, "rport-%d:%d-%d",
3101 shost->host_no, channel, rport->number);
3102 transport_setup_device(dev);
3103
3104 error = device_add(dev);
3105 if (error) {
3106 printk(KERN_ERR "FC Remote Port device_add failed\n");
3107 goto delete_rport;
3108 }
3109 transport_add_device(dev);
3110 transport_configure_device(dev);
3111
3112 fc_bsg_rportadd(shost, rport);
3113 /* ignore any bsg add error - we just can't do sgio */
3114
3115 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
3116 /* initiate a scan of the target */
3117 rport->flags |= FC_RPORT_SCAN_PENDING;
3118 scsi_queue_work(shost, &rport->scan_work);
3119 }
3120
3121 return rport;
3122
3123 delete_rport:
3124 transport_destroy_device(dev);
3125 spin_lock_irqsave(shost->host_lock, flags);
3126 list_del(&rport->peers);
3127 scsi_host_put(shost); /* for fc_host->rport list */
3128 spin_unlock_irqrestore(shost->host_lock, flags);
3129 put_device(dev->parent);
3130 kfree(rport);
3131 return NULL;
3132 }
3133
3134 /**
3135 * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
3136 * @shost: scsi host the remote port is connected to.
3137 * @channel: Channel on shost port connected to.
3138 * @ids: The world wide names, fc address, and FC4 port
3139 * roles for the remote port.
3140 *
3141 * The LLDD calls this routine to notify the transport of the existence
3142 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
3143 * of the port, it's FC address (port_id), and the FC4 roles that are
3144 * active for the port.
3145 *
3146 * For ports that are FCP targets (aka scsi targets), the FC transport
3147 * maintains consistent target id bindings on behalf of the LLDD.
3148 * A consistent target id binding is an assignment of a target id to
3149 * a remote port identifier, which persists while the scsi host is
3150 * attached. The remote port can disappear, then later reappear, and
3151 * it's target id assignment remains the same. This allows for shifts
3152 * in FC addressing (if binding by wwpn or wwnn) with no apparent
3153 * changes to the scsi subsystem which is based on scsi host number and
3154 * target id values. Bindings are only valid during the attachment of
3155 * the scsi host. If the host detaches, then later re-attaches, target
3156 * id bindings may change.
3157 *
3158 * This routine is responsible for returning a remote port structure.
3159 * The routine will search the list of remote ports it maintains
3160 * internally on behalf of consistent target id mappings. If found, the
3161 * remote port structure will be reused. Otherwise, a new remote port
3162 * structure will be allocated.
3163 *
3164 * Whenever a remote port is allocated, a new fc_remote_port class
3165 * device is created.
3166 *
3167 * Should not be called from interrupt context.
3168 *
3169 * Notes:
3170 * This routine assumes no locks are held on entry.
3171 */
3172 struct fc_rport *
fc_remote_port_add(struct Scsi_Host * shost,int channel,struct fc_rport_identifiers * ids)3173 fc_remote_port_add(struct Scsi_Host *shost, int channel,
3174 struct fc_rport_identifiers *ids)
3175 {
3176 struct fc_internal *fci = to_fc_internal(shost->transportt);
3177 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3178 struct fc_rport *rport;
3179 unsigned long flags;
3180 int match = 0;
3181
3182 /* ensure any stgt delete functions are done */
3183 fc_flush_work(shost);
3184
3185 /*
3186 * Search the list of "active" rports, for an rport that has been
3187 * deleted, but we've held off the real delete while the target
3188 * is in a "blocked" state.
3189 */
3190 spin_lock_irqsave(shost->host_lock, flags);
3191
3192 list_for_each_entry(rport, &fc_host->rports, peers) {
3193
3194 if ((rport->port_state == FC_PORTSTATE_BLOCKED ||
3195 rport->port_state == FC_PORTSTATE_NOTPRESENT) &&
3196 (rport->channel == channel)) {
3197
3198 switch (fc_host->tgtid_bind_type) {
3199 case FC_TGTID_BIND_BY_WWPN:
3200 case FC_TGTID_BIND_NONE:
3201 if (rport->port_name == ids->port_name)
3202 match = 1;
3203 break;
3204 case FC_TGTID_BIND_BY_WWNN:
3205 if (rport->node_name == ids->node_name)
3206 match = 1;
3207 break;
3208 case FC_TGTID_BIND_BY_ID:
3209 if (rport->port_id == ids->port_id)
3210 match = 1;
3211 break;
3212 }
3213
3214 if (match) {
3215
3216 memcpy(&rport->node_name, &ids->node_name,
3217 sizeof(rport->node_name));
3218 memcpy(&rport->port_name, &ids->port_name,
3219 sizeof(rport->port_name));
3220 rport->port_id = ids->port_id;
3221
3222 rport->port_state = FC_PORTSTATE_ONLINE;
3223 rport->roles = ids->roles;
3224
3225 spin_unlock_irqrestore(shost->host_lock, flags);
3226
3227 if (fci->f->dd_fcrport_size)
3228 memset(rport->dd_data, 0,
3229 fci->f->dd_fcrport_size);
3230
3231 /*
3232 * If we were not a target, cancel the
3233 * io terminate and rport timers, and
3234 * we're done.
3235 *
3236 * If we were a target, but our new role
3237 * doesn't indicate a target, leave the
3238 * timers running expecting the role to
3239 * change as the target fully logs in. If
3240 * it doesn't, the target will be torn down.
3241 *
3242 * If we were a target, and our role shows
3243 * we're still a target, cancel the timers
3244 * and kick off a scan.
3245 */
3246
3247 /* was a target, not in roles */
3248 if ((rport->scsi_target_id != -1) &&
3249 (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
3250 return rport;
3251
3252 /*
3253 * Stop the fail io and dev_loss timers.
3254 * If they flush, the port_state will
3255 * be checked and will NOOP the function.
3256 */
3257 if (!cancel_delayed_work(&rport->fail_io_work))
3258 fc_flush_devloss(shost);
3259 if (!cancel_delayed_work(&rport->dev_loss_work))
3260 fc_flush_devloss(shost);
3261
3262 spin_lock_irqsave(shost->host_lock, flags);
3263
3264 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3265 FC_RPORT_DEVLOSS_PENDING |
3266 FC_RPORT_DEVLOSS_CALLBK_DONE);
3267
3268 spin_unlock_irqrestore(shost->host_lock, flags);
3269
3270 /* if target, initiate a scan */
3271 if (rport->scsi_target_id != -1) {
3272 scsi_target_unblock(&rport->dev,
3273 SDEV_RUNNING);
3274 spin_lock_irqsave(shost->host_lock,
3275 flags);
3276 rport->flags |= FC_RPORT_SCAN_PENDING;
3277 scsi_queue_work(shost,
3278 &rport->scan_work);
3279 spin_unlock_irqrestore(shost->host_lock,
3280 flags);
3281 }
3282
3283 fc_bsg_goose_queue(rport);
3284
3285 return rport;
3286 }
3287 }
3288 }
3289
3290 /*
3291 * Search the bindings array
3292 * Note: if never a FCP target, you won't be on this list
3293 */
3294 if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
3295
3296 /* search for a matching consistent binding */
3297
3298 list_for_each_entry(rport, &fc_host->rport_bindings,
3299 peers) {
3300 if (rport->channel != channel)
3301 continue;
3302
3303 switch (fc_host->tgtid_bind_type) {
3304 case FC_TGTID_BIND_BY_WWPN:
3305 if (rport->port_name == ids->port_name)
3306 match = 1;
3307 break;
3308 case FC_TGTID_BIND_BY_WWNN:
3309 if (rport->node_name == ids->node_name)
3310 match = 1;
3311 break;
3312 case FC_TGTID_BIND_BY_ID:
3313 if (rport->port_id == ids->port_id)
3314 match = 1;
3315 break;
3316 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3317 break;
3318 }
3319
3320 if (match) {
3321 list_move_tail(&rport->peers, &fc_host->rports);
3322 break;
3323 }
3324 }
3325
3326 if (match) {
3327 memcpy(&rport->node_name, &ids->node_name,
3328 sizeof(rport->node_name));
3329 memcpy(&rport->port_name, &ids->port_name,
3330 sizeof(rport->port_name));
3331 rport->port_id = ids->port_id;
3332 rport->port_state = FC_PORTSTATE_ONLINE;
3333 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3334
3335 if (fci->f->dd_fcrport_size)
3336 memset(rport->dd_data, 0,
3337 fci->f->dd_fcrport_size);
3338 spin_unlock_irqrestore(shost->host_lock, flags);
3339
3340 fc_remote_port_rolechg(rport, ids->roles);
3341 return rport;
3342 }
3343 }
3344
3345 spin_unlock_irqrestore(shost->host_lock, flags);
3346
3347 /* No consistent binding found - create new remote port entry */
3348 rport = fc_remote_port_create(shost, channel, ids);
3349
3350 return rport;
3351 }
3352 EXPORT_SYMBOL(fc_remote_port_add);
3353
3354
3355 /**
3356 * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
3357 * @rport: The remote port that no longer exists
3358 *
3359 * The LLDD calls this routine to notify the transport that a remote
3360 * port is no longer part of the topology. Note: Although a port
3361 * may no longer be part of the topology, it may persist in the remote
3362 * ports displayed by the fc_host. We do this under 2 conditions:
3363 *
3364 * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
3365 * This allows the port to temporarily disappear, then reappear without
3366 * disrupting the SCSI device tree attached to it. During the "blocked"
3367 * period the port will still exist.
3368 *
3369 * 2) If the port was a scsi target and disappears for longer than we
3370 * expect, we'll delete the port and the tear down the SCSI device tree
3371 * attached to it. However, we want to semi-persist the target id assigned
3372 * to that port if it eventually does exist. The port structure will
3373 * remain (although with minimal information) so that the target id
3374 * bindings also remain.
3375 *
3376 * If the remote port is not an FCP Target, it will be fully torn down
3377 * and deallocated, including the fc_remote_port class device.
3378 *
3379 * If the remote port is an FCP Target, the port will be placed in a
3380 * temporary blocked state. From the LLDD's perspective, the rport no
3381 * longer exists. From the SCSI midlayer's perspective, the SCSI target
3382 * exists, but all sdevs on it are blocked from further I/O. The following
3383 * is then expected.
3384 *
3385 * If the remote port does not return (signaled by a LLDD call to
3386 * fc_remote_port_add()) within the dev_loss_tmo timeout, then the
3387 * scsi target is removed - killing all outstanding i/o and removing the
3388 * scsi devices attached to it. The port structure will be marked Not
3389 * Present and be partially cleared, leaving only enough information to
3390 * recognize the remote port relative to the scsi target id binding if
3391 * it later appears. The port will remain as long as there is a valid
3392 * binding (e.g. until the user changes the binding type or unloads the
3393 * scsi host with the binding).
3394 *
3395 * If the remote port returns within the dev_loss_tmo value (and matches
3396 * according to the target id binding type), the port structure will be
3397 * reused. If it is no longer a SCSI target, the target will be torn
3398 * down. If it continues to be a SCSI target, then the target will be
3399 * unblocked (allowing i/o to be resumed), and a scan will be activated
3400 * to ensure that all luns are detected.
3401 *
3402 * Called from normal process context only - cannot be called from interrupt.
3403 *
3404 * Notes:
3405 * This routine assumes no locks are held on entry.
3406 */
3407 void
fc_remote_port_delete(struct fc_rport * rport)3408 fc_remote_port_delete(struct fc_rport *rport)
3409 {
3410 struct Scsi_Host *shost = rport_to_shost(rport);
3411 unsigned long timeout = rport->dev_loss_tmo;
3412 unsigned long flags;
3413
3414 /*
3415 * No need to flush the fc_host work_q's, as all adds are synchronous.
3416 *
3417 * We do need to reclaim the rport scan work element, so eventually
3418 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
3419 * there's still a scan pending.
3420 */
3421
3422 spin_lock_irqsave(shost->host_lock, flags);
3423
3424 if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
3425 (rport->port_state != FC_PORTSTATE_MARGINAL)) {
3426 spin_unlock_irqrestore(shost->host_lock, flags);
3427 return;
3428 }
3429
3430 /*
3431 * In the past, we if this was not an FCP-Target, we would
3432 * unconditionally just jump to deleting the rport.
3433 * However, rports can be used as node containers by the LLDD,
3434 * and its not appropriate to just terminate the rport at the
3435 * first sign of a loss in connectivity. The LLDD may want to
3436 * send ELS traffic to re-validate the login. If the rport is
3437 * immediately deleted, it makes it inappropriate for a node
3438 * container.
3439 * So... we now unconditionally wait dev_loss_tmo before
3440 * destroying an rport.
3441 */
3442
3443 rport->port_state = FC_PORTSTATE_BLOCKED;
3444
3445 rport->flags |= FC_RPORT_DEVLOSS_PENDING;
3446
3447 spin_unlock_irqrestore(shost->host_lock, flags);
3448
3449 scsi_block_targets(shost, &rport->dev);
3450
3451 /* see if we need to kill io faster than waiting for device loss */
3452 if ((rport->fast_io_fail_tmo != -1) &&
3453 (rport->fast_io_fail_tmo < timeout))
3454 fc_queue_devloss_work(shost, &rport->fail_io_work,
3455 rport->fast_io_fail_tmo * HZ);
3456
3457 /* cap the length the devices can be blocked until they are deleted */
3458 fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
3459 }
3460 EXPORT_SYMBOL(fc_remote_port_delete);
3461
3462 /**
3463 * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
3464 * @rport: The remote port that changed.
3465 * @roles: New roles for this port.
3466 *
3467 * Description: The LLDD calls this routine to notify the transport that the
3468 * roles on a remote port may have changed. The largest effect of this is
3469 * if a port now becomes a FCP Target, it must be allocated a
3470 * scsi target id. If the port is no longer a FCP target, any
3471 * scsi target id value assigned to it will persist in case the
3472 * role changes back to include FCP Target. No changes in the scsi
3473 * midlayer will be invoked if the role changes (in the expectation
3474 * that the role will be resumed. If it doesn't normal error processing
3475 * will take place).
3476 *
3477 * Should not be called from interrupt context.
3478 *
3479 * Notes:
3480 * This routine assumes no locks are held on entry.
3481 */
3482 void
fc_remote_port_rolechg(struct fc_rport * rport,u32 roles)3483 fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
3484 {
3485 struct Scsi_Host *shost = rport_to_shost(rport);
3486 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3487 unsigned long flags;
3488 int create = 0;
3489
3490 spin_lock_irqsave(shost->host_lock, flags);
3491 if (roles & FC_PORT_ROLE_FCP_TARGET) {
3492 if (rport->scsi_target_id == -1) {
3493 rport->scsi_target_id = fc_host->next_target_id++;
3494 create = 1;
3495 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3496 create = 1;
3497 }
3498
3499 rport->roles = roles;
3500
3501 spin_unlock_irqrestore(shost->host_lock, flags);
3502
3503 if (create) {
3504 /*
3505 * There may have been a delete timer running on the
3506 * port. Ensure that it is cancelled as we now know
3507 * the port is an FCP Target.
3508 * Note: we know the rport exists and is in an online
3509 * state as the LLDD would not have had an rport
3510 * reference to pass us.
3511 *
3512 * Take no action on the del_timer failure as the state
3513 * machine state change will validate the
3514 * transaction.
3515 */
3516 if (!cancel_delayed_work(&rport->fail_io_work))
3517 fc_flush_devloss(shost);
3518 if (!cancel_delayed_work(&rport->dev_loss_work))
3519 fc_flush_devloss(shost);
3520
3521 spin_lock_irqsave(shost->host_lock, flags);
3522 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3523 FC_RPORT_DEVLOSS_PENDING |
3524 FC_RPORT_DEVLOSS_CALLBK_DONE);
3525 spin_unlock_irqrestore(shost->host_lock, flags);
3526
3527 /* ensure any stgt delete functions are done */
3528 fc_flush_work(shost);
3529
3530 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
3531 /* initiate a scan of the target */
3532 spin_lock_irqsave(shost->host_lock, flags);
3533 rport->flags |= FC_RPORT_SCAN_PENDING;
3534 scsi_queue_work(shost, &rport->scan_work);
3535 spin_unlock_irqrestore(shost->host_lock, flags);
3536 }
3537 }
3538 EXPORT_SYMBOL(fc_remote_port_rolechg);
3539
3540 /**
3541 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3542 * @work: rport target that failed to reappear in the allotted time.
3543 *
3544 * Description: An attempt to delete a remote port blocks, and if it fails
3545 * to return in the allotted time this gets called.
3546 */
3547 static void
fc_timeout_deleted_rport(struct work_struct * work)3548 fc_timeout_deleted_rport(struct work_struct *work)
3549 {
3550 struct fc_rport *rport =
3551 container_of(work, struct fc_rport, dev_loss_work.work);
3552 struct Scsi_Host *shost = rport_to_shost(rport);
3553 struct fc_internal *i = to_fc_internal(shost->transportt);
3554 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3555 unsigned long flags;
3556 int do_callback = 0;
3557
3558 spin_lock_irqsave(shost->host_lock, flags);
3559
3560 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3561
3562 /*
3563 * If the port is ONLINE, then it came back. If it was a SCSI
3564 * target, validate it still is. If not, tear down the
3565 * scsi_target on it.
3566 */
3567 if (((rport->port_state == FC_PORTSTATE_ONLINE) ||
3568 (rport->port_state == FC_PORTSTATE_MARGINAL)) &&
3569 (rport->scsi_target_id != -1) &&
3570 !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3571 dev_printk(KERN_ERR, &rport->dev,
3572 "blocked FC remote port time out: no longer"
3573 " a FCP target, removing starget\n");
3574 spin_unlock_irqrestore(shost->host_lock, flags);
3575 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
3576 fc_queue_work(shost, &rport->stgt_delete_work);
3577 return;
3578 }
3579
3580 /* NOOP state - we're flushing workq's */
3581 if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3582 spin_unlock_irqrestore(shost->host_lock, flags);
3583 dev_printk(KERN_ERR, &rport->dev,
3584 "blocked FC remote port time out: leaving"
3585 " rport%s alone\n",
3586 (rport->scsi_target_id != -1) ? " and starget" : "");
3587 return;
3588 }
3589
3590 if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3591 (rport->scsi_target_id == -1)) {
3592 list_del(&rport->peers);
3593 rport->port_state = FC_PORTSTATE_DELETED;
3594 dev_printk(KERN_ERR, &rport->dev,
3595 "blocked FC remote port time out: removing"
3596 " rport%s\n",
3597 (rport->scsi_target_id != -1) ? " and starget" : "");
3598 fc_queue_work(shost, &rport->rport_delete_work);
3599 spin_unlock_irqrestore(shost->host_lock, flags);
3600 return;
3601 }
3602
3603 dev_printk(KERN_ERR, &rport->dev,
3604 "blocked FC remote port time out: removing target and "
3605 "saving binding\n");
3606
3607 list_move_tail(&rport->peers, &fc_host->rport_bindings);
3608
3609 /*
3610 * Note: We do not remove or clear the hostdata area. This allows
3611 * host-specific target data to persist along with the
3612 * scsi_target_id. It's up to the host to manage it's hostdata area.
3613 */
3614
3615 /*
3616 * Reinitialize port attributes that may change if the port comes back.
3617 */
3618 rport->maxframe_size = -1;
3619 rport->supported_classes = FC_COS_UNSPECIFIED;
3620 rport->roles = FC_PORT_ROLE_UNKNOWN;
3621 rport->port_state = FC_PORTSTATE_NOTPRESENT;
3622 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3623
3624 /*
3625 * Pre-emptively kill I/O rather than waiting for the work queue
3626 * item to teardown the starget. (FCOE libFC folks prefer this
3627 * and to have the rport_port_id still set when it's done).
3628 */
3629 spin_unlock_irqrestore(shost->host_lock, flags);
3630 fc_terminate_rport_io(rport);
3631
3632 spin_lock_irqsave(shost->host_lock, flags);
3633
3634 if (rport->port_state == FC_PORTSTATE_NOTPRESENT) { /* still missing */
3635
3636 /* remove the identifiers that aren't used in the consisting binding */
3637 switch (fc_host->tgtid_bind_type) {
3638 case FC_TGTID_BIND_BY_WWPN:
3639 rport->node_name = -1;
3640 rport->port_id = -1;
3641 break;
3642 case FC_TGTID_BIND_BY_WWNN:
3643 rport->port_name = -1;
3644 rport->port_id = -1;
3645 break;
3646 case FC_TGTID_BIND_BY_ID:
3647 rport->node_name = -1;
3648 rport->port_name = -1;
3649 break;
3650 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3651 break;
3652 }
3653
3654 /*
3655 * As this only occurs if the remote port (scsi target)
3656 * went away and didn't come back - we'll remove
3657 * all attached scsi devices.
3658 */
3659 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3660 fc_queue_work(shost, &rport->stgt_delete_work);
3661
3662 do_callback = 1;
3663 }
3664
3665 spin_unlock_irqrestore(shost->host_lock, flags);
3666
3667 /*
3668 * Notify the driver that the rport is now dead. The LLDD will
3669 * also guarantee that any communication to the rport is terminated
3670 *
3671 * Note: we set the CALLBK_DONE flag above to correspond
3672 */
3673 if (do_callback && i->f->dev_loss_tmo_callbk)
3674 i->f->dev_loss_tmo_callbk(rport);
3675 }
3676
3677
3678 /**
3679 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3680 * @work: rport to terminate io on.
3681 *
3682 * Notes: Only requests the failure of the io, not that all are flushed
3683 * prior to returning.
3684 */
3685 static void
fc_timeout_fail_rport_io(struct work_struct * work)3686 fc_timeout_fail_rport_io(struct work_struct *work)
3687 {
3688 struct fc_rport *rport =
3689 container_of(work, struct fc_rport, fail_io_work.work);
3690
3691 if (rport->port_state != FC_PORTSTATE_BLOCKED)
3692 return;
3693
3694 rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3695 fc_terminate_rport_io(rport);
3696 }
3697
3698 /**
3699 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3700 * @work: remote port to be scanned.
3701 */
3702 static void
fc_scsi_scan_rport(struct work_struct * work)3703 fc_scsi_scan_rport(struct work_struct *work)
3704 {
3705 struct fc_rport *rport =
3706 container_of(work, struct fc_rport, scan_work);
3707 struct Scsi_Host *shost = rport_to_shost(rport);
3708 struct fc_internal *i = to_fc_internal(shost->transportt);
3709 unsigned long flags;
3710
3711 if (((rport->port_state == FC_PORTSTATE_ONLINE) ||
3712 (rport->port_state == FC_PORTSTATE_MARGINAL)) &&
3713 (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3714 !(i->f->disable_target_scan)) {
3715 scsi_scan_target(&rport->dev, rport->channel,
3716 rport->scsi_target_id, SCAN_WILD_CARD,
3717 SCSI_SCAN_RESCAN);
3718 }
3719
3720 spin_lock_irqsave(shost->host_lock, flags);
3721 rport->flags &= ~FC_RPORT_SCAN_PENDING;
3722 spin_unlock_irqrestore(shost->host_lock, flags);
3723 }
3724
3725 /**
3726 * fc_block_rport() - Block SCSI eh thread for blocked fc_rport.
3727 * @rport: Remote port that scsi_eh is trying to recover.
3728 *
3729 * This routine can be called from a FC LLD scsi_eh callback. It
3730 * blocks the scsi_eh thread until the fc_rport leaves the
3731 * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3732 * necessary to avoid the scsi_eh failing recovery actions for blocked
3733 * rports which would lead to offlined SCSI devices.
3734 *
3735 * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3736 * FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3737 * passed back to scsi_eh.
3738 */
fc_block_rport(struct fc_rport * rport)3739 int fc_block_rport(struct fc_rport *rport)
3740 {
3741 struct Scsi_Host *shost = rport_to_shost(rport);
3742 unsigned long flags;
3743
3744 spin_lock_irqsave(shost->host_lock, flags);
3745 while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3746 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3747 spin_unlock_irqrestore(shost->host_lock, flags);
3748 msleep(1000);
3749 spin_lock_irqsave(shost->host_lock, flags);
3750 }
3751 spin_unlock_irqrestore(shost->host_lock, flags);
3752
3753 if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3754 return FAST_IO_FAIL;
3755
3756 return 0;
3757 }
3758 EXPORT_SYMBOL(fc_block_rport);
3759
3760 /**
3761 * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3762 * @cmnd: SCSI command that scsi_eh is trying to recover
3763 *
3764 * This routine can be called from a FC LLD scsi_eh callback. It
3765 * blocks the scsi_eh thread until the fc_rport leaves the
3766 * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3767 * necessary to avoid the scsi_eh failing recovery actions for blocked
3768 * rports which would lead to offlined SCSI devices.
3769 *
3770 * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3771 * FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3772 * passed back to scsi_eh.
3773 */
fc_block_scsi_eh(struct scsi_cmnd * cmnd)3774 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3775 {
3776 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3777
3778 if (WARN_ON_ONCE(!rport))
3779 return FAST_IO_FAIL;
3780
3781 return fc_block_rport(rport);
3782 }
3783 EXPORT_SYMBOL(fc_block_scsi_eh);
3784
3785 /*
3786 * fc_eh_should_retry_cmd - Checks if the cmd should be retried or not
3787 * @scmd: The SCSI command to be checked
3788 *
3789 * This checks the rport state to decide if a cmd is
3790 * retryable.
3791 *
3792 * Returns: true if the rport state is not in marginal state.
3793 */
fc_eh_should_retry_cmd(struct scsi_cmnd * scmd)3794 bool fc_eh_should_retry_cmd(struct scsi_cmnd *scmd)
3795 {
3796 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
3797
3798 if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
3799 (scsi_cmd_to_rq(scmd)->cmd_flags & REQ_FAILFAST_TRANSPORT)) {
3800 set_host_byte(scmd, DID_TRANSPORT_MARGINAL);
3801 return false;
3802 }
3803 return true;
3804 }
3805 EXPORT_SYMBOL_GPL(fc_eh_should_retry_cmd);
3806
3807 /**
3808 * fc_vport_setup - allocates and creates a FC virtual port.
3809 * @shost: scsi host the virtual port is connected to.
3810 * @channel: Channel on shost port connected to.
3811 * @pdev: parent device for vport
3812 * @ids: The world wide names, FC4 port roles, etc for
3813 * the virtual port.
3814 * @ret_vport: The pointer to the created vport.
3815 *
3816 * Allocates and creates the vport structure, calls the parent host
3817 * to instantiate the vport, this completes w/ class and sysfs creation.
3818 *
3819 * Notes:
3820 * This routine assumes no locks are held on entry.
3821 */
3822 static int
fc_vport_setup(struct Scsi_Host * shost,int channel,struct device * pdev,struct fc_vport_identifiers * ids,struct fc_vport ** ret_vport)3823 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3824 struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
3825 {
3826 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3827 struct fc_internal *fci = to_fc_internal(shost->transportt);
3828 struct fc_vport *vport;
3829 struct device *dev;
3830 unsigned long flags;
3831 size_t size;
3832 int error;
3833
3834 *ret_vport = NULL;
3835
3836 if ( ! fci->f->vport_create)
3837 return -ENOENT;
3838
3839 size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3840 vport = kzalloc(size, GFP_KERNEL);
3841 if (unlikely(!vport)) {
3842 printk(KERN_ERR "%s: allocation failure\n", __func__);
3843 return -ENOMEM;
3844 }
3845
3846 vport->vport_state = FC_VPORT_UNKNOWN;
3847 vport->vport_last_state = FC_VPORT_UNKNOWN;
3848 vport->node_name = ids->node_name;
3849 vport->port_name = ids->port_name;
3850 vport->roles = ids->roles;
3851 vport->vport_type = ids->vport_type;
3852 if (fci->f->dd_fcvport_size)
3853 vport->dd_data = &vport[1];
3854 vport->shost = shost;
3855 vport->channel = channel;
3856 vport->flags = FC_VPORT_CREATING;
3857 INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3858
3859 spin_lock_irqsave(shost->host_lock, flags);
3860
3861 if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3862 spin_unlock_irqrestore(shost->host_lock, flags);
3863 kfree(vport);
3864 return -ENOSPC;
3865 }
3866 fc_host->npiv_vports_inuse++;
3867 vport->number = fc_host->next_vport_number++;
3868 list_add_tail(&vport->peers, &fc_host->vports);
3869 scsi_host_get(shost); /* for fc_host->vport list */
3870
3871 spin_unlock_irqrestore(shost->host_lock, flags);
3872
3873 dev = &vport->dev;
3874 device_initialize(dev); /* takes self reference */
3875 dev->parent = get_device(pdev); /* takes parent reference */
3876 dev->release = fc_vport_dev_release;
3877 dev_set_name(dev, "vport-%d:%d-%d",
3878 shost->host_no, channel, vport->number);
3879 transport_setup_device(dev);
3880
3881 error = device_add(dev);
3882 if (error) {
3883 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3884 goto delete_vport;
3885 }
3886 transport_add_device(dev);
3887 transport_configure_device(dev);
3888
3889 error = fci->f->vport_create(vport, ids->disable);
3890 if (error) {
3891 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3892 goto delete_vport_all;
3893 }
3894
3895 /*
3896 * if the parent isn't the physical adapter's Scsi_Host, ensure
3897 * the Scsi_Host at least contains a symlink to the vport.
3898 */
3899 if (pdev != &shost->shost_gendev) {
3900 error = sysfs_create_link(&shost->shost_gendev.kobj,
3901 &dev->kobj, dev_name(dev));
3902 if (error)
3903 printk(KERN_ERR
3904 "%s: Cannot create vport symlinks for "
3905 "%s, err=%d\n",
3906 __func__, dev_name(dev), error);
3907 }
3908 spin_lock_irqsave(shost->host_lock, flags);
3909 vport->flags &= ~FC_VPORT_CREATING;
3910 spin_unlock_irqrestore(shost->host_lock, flags);
3911
3912 dev_printk(KERN_NOTICE, pdev,
3913 "%s created via shost%d channel %d\n", dev_name(dev),
3914 shost->host_no, channel);
3915
3916 *ret_vport = vport;
3917
3918 return 0;
3919
3920 delete_vport_all:
3921 transport_remove_device(dev);
3922 device_del(dev);
3923 delete_vport:
3924 transport_destroy_device(dev);
3925 spin_lock_irqsave(shost->host_lock, flags);
3926 list_del(&vport->peers);
3927 scsi_host_put(shost); /* for fc_host->vport list */
3928 fc_host->npiv_vports_inuse--;
3929 spin_unlock_irqrestore(shost->host_lock, flags);
3930 put_device(dev->parent);
3931 kfree(vport);
3932
3933 return error;
3934 }
3935
3936 /**
3937 * fc_vport_create - Admin App or LLDD requests creation of a vport
3938 * @shost: scsi host the virtual port is connected to.
3939 * @channel: channel on shost port connected to.
3940 * @ids: The world wide names, FC4 port roles, etc for
3941 * the virtual port.
3942 *
3943 * Notes:
3944 * This routine assumes no locks are held on entry.
3945 */
3946 struct fc_vport *
fc_vport_create(struct Scsi_Host * shost,int channel,struct fc_vport_identifiers * ids)3947 fc_vport_create(struct Scsi_Host *shost, int channel,
3948 struct fc_vport_identifiers *ids)
3949 {
3950 int stat;
3951 struct fc_vport *vport;
3952
3953 stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3954 ids, &vport);
3955 return stat ? NULL : vport;
3956 }
3957 EXPORT_SYMBOL(fc_vport_create);
3958
3959 /**
3960 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3961 * @vport: fc_vport to be terminated
3962 *
3963 * Calls the LLDD vport_delete() function, then deallocates and removes
3964 * the vport from the shost and object tree.
3965 *
3966 * Notes:
3967 * This routine assumes no locks are held on entry.
3968 */
3969 int
fc_vport_terminate(struct fc_vport * vport)3970 fc_vport_terminate(struct fc_vport *vport)
3971 {
3972 struct Scsi_Host *shost = vport_to_shost(vport);
3973 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3974 struct fc_internal *i = to_fc_internal(shost->transportt);
3975 struct device *dev = &vport->dev;
3976 unsigned long flags;
3977 int stat;
3978
3979 if (i->f->vport_delete)
3980 stat = i->f->vport_delete(vport);
3981 else
3982 stat = -ENOENT;
3983
3984 spin_lock_irqsave(shost->host_lock, flags);
3985 vport->flags &= ~FC_VPORT_DELETING;
3986 if (!stat) {
3987 vport->flags |= FC_VPORT_DELETED;
3988 list_del(&vport->peers);
3989 fc_host->npiv_vports_inuse--;
3990 scsi_host_put(shost); /* for fc_host->vport list */
3991 }
3992 spin_unlock_irqrestore(shost->host_lock, flags);
3993
3994 if (stat)
3995 return stat;
3996
3997 if (dev->parent != &shost->shost_gendev)
3998 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3999 transport_remove_device(dev);
4000 device_del(dev);
4001 transport_destroy_device(dev);
4002
4003 /*
4004 * Removing our self-reference should mean our
4005 * release function gets called, which will drop the remaining
4006 * parent reference and free the data structure.
4007 */
4008 put_device(dev); /* for self-reference */
4009
4010 return 0; /* SUCCESS */
4011 }
4012 EXPORT_SYMBOL(fc_vport_terminate);
4013
4014 /**
4015 * fc_vport_sched_delete - workq-based delete request for a vport
4016 * @work: vport to be deleted.
4017 */
4018 static void
fc_vport_sched_delete(struct work_struct * work)4019 fc_vport_sched_delete(struct work_struct *work)
4020 {
4021 struct fc_vport *vport =
4022 container_of(work, struct fc_vport, vport_delete_work);
4023 int stat;
4024
4025 stat = fc_vport_terminate(vport);
4026 if (stat)
4027 dev_printk(KERN_ERR, vport->dev.parent,
4028 "%s: %s could not be deleted created via "
4029 "shost%d channel %d - error %d\n", __func__,
4030 dev_name(&vport->dev), vport->shost->host_no,
4031 vport->channel, stat);
4032 }
4033
4034
4035 /*
4036 * BSG support
4037 */
4038
4039 /**
4040 * fc_bsg_job_timeout - handler for when a bsg request timesout
4041 * @req: request that timed out
4042 */
4043 static enum blk_eh_timer_return
fc_bsg_job_timeout(struct request * req)4044 fc_bsg_job_timeout(struct request *req)
4045 {
4046 struct bsg_job *job = blk_mq_rq_to_pdu(req);
4047 struct Scsi_Host *shost = fc_bsg_to_shost(job);
4048 struct fc_rport *rport = fc_bsg_to_rport(job);
4049 struct fc_internal *i = to_fc_internal(shost->transportt);
4050 int err = 0, inflight = 0;
4051
4052 if (rport && rport->port_state == FC_PORTSTATE_BLOCKED)
4053 return BLK_EH_RESET_TIMER;
4054
4055 inflight = bsg_job_get(job);
4056
4057 if (inflight && i->f->bsg_timeout) {
4058 /* call LLDD to abort the i/o as it has timed out */
4059 err = i->f->bsg_timeout(job);
4060 if (err == -EAGAIN) {
4061 bsg_job_put(job);
4062 return BLK_EH_RESET_TIMER;
4063 } else if (err)
4064 printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
4065 "abort failed with status %d\n", err);
4066 }
4067
4068 /* the blk_end_sync_io() doesn't check the error */
4069 if (inflight)
4070 blk_mq_end_request(req, BLK_STS_IOERR);
4071 return BLK_EH_DONE;
4072 }
4073
4074 /**
4075 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
4076 * @shost: scsi host rport attached to
4077 * @job: bsg job to be processed
4078 */
fc_bsg_host_dispatch(struct Scsi_Host * shost,struct bsg_job * job)4079 static int fc_bsg_host_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
4080 {
4081 struct fc_internal *i = to_fc_internal(shost->transportt);
4082 struct fc_bsg_request *bsg_request = job->request;
4083 struct fc_bsg_reply *bsg_reply = job->reply;
4084 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
4085 int ret;
4086
4087 /* check if we really have all the request data needed */
4088 if (job->request_len < cmdlen) {
4089 ret = -ENOMSG;
4090 goto fail_host_msg;
4091 }
4092
4093 /* Validate the host command */
4094 switch (bsg_request->msgcode) {
4095 case FC_BSG_HST_ADD_RPORT:
4096 cmdlen += sizeof(struct fc_bsg_host_add_rport);
4097 break;
4098
4099 case FC_BSG_HST_DEL_RPORT:
4100 cmdlen += sizeof(struct fc_bsg_host_del_rport);
4101 break;
4102
4103 case FC_BSG_HST_ELS_NOLOGIN:
4104 cmdlen += sizeof(struct fc_bsg_host_els);
4105 /* there better be a xmt and rcv payloads */
4106 if ((!job->request_payload.payload_len) ||
4107 (!job->reply_payload.payload_len)) {
4108 ret = -EINVAL;
4109 goto fail_host_msg;
4110 }
4111 break;
4112
4113 case FC_BSG_HST_CT:
4114 cmdlen += sizeof(struct fc_bsg_host_ct);
4115 /* there better be xmt and rcv payloads */
4116 if ((!job->request_payload.payload_len) ||
4117 (!job->reply_payload.payload_len)) {
4118 ret = -EINVAL;
4119 goto fail_host_msg;
4120 }
4121 break;
4122
4123 case FC_BSG_HST_VENDOR:
4124 cmdlen += sizeof(struct fc_bsg_host_vendor);
4125 if ((shost->hostt->vendor_id == 0L) ||
4126 (bsg_request->rqst_data.h_vendor.vendor_id !=
4127 shost->hostt->vendor_id)) {
4128 ret = -ESRCH;
4129 goto fail_host_msg;
4130 }
4131 break;
4132
4133 default:
4134 ret = -EBADR;
4135 goto fail_host_msg;
4136 }
4137
4138 ret = i->f->bsg_request(job);
4139 if (!ret)
4140 return 0;
4141
4142 fail_host_msg:
4143 /* return the errno failure code as the only status */
4144 BUG_ON(job->reply_len < sizeof(uint32_t));
4145 bsg_reply->reply_payload_rcv_len = 0;
4146 bsg_reply->result = ret;
4147 job->reply_len = sizeof(uint32_t);
4148 bsg_job_done(job, bsg_reply->result,
4149 bsg_reply->reply_payload_rcv_len);
4150 return 0;
4151 }
4152
4153
4154 /*
4155 * fc_bsg_goose_queue - restart rport queue in case it was stopped
4156 * @rport: rport to be restarted
4157 */
4158 static void
fc_bsg_goose_queue(struct fc_rport * rport)4159 fc_bsg_goose_queue(struct fc_rport *rport)
4160 {
4161 struct request_queue *q = rport->rqst_q;
4162
4163 if (q)
4164 blk_mq_run_hw_queues(q, true);
4165 }
4166
4167 /**
4168 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
4169 * @shost: scsi host rport attached to
4170 * @job: bsg job to be processed
4171 */
fc_bsg_rport_dispatch(struct Scsi_Host * shost,struct bsg_job * job)4172 static int fc_bsg_rport_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
4173 {
4174 struct fc_internal *i = to_fc_internal(shost->transportt);
4175 struct fc_bsg_request *bsg_request = job->request;
4176 struct fc_bsg_reply *bsg_reply = job->reply;
4177 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
4178 int ret;
4179
4180 /* check if we really have all the request data needed */
4181 if (job->request_len < cmdlen) {
4182 ret = -ENOMSG;
4183 goto fail_rport_msg;
4184 }
4185
4186 /* Validate the rport command */
4187 switch (bsg_request->msgcode) {
4188 case FC_BSG_RPT_ELS:
4189 cmdlen += sizeof(struct fc_bsg_rport_els);
4190 goto check_bidi;
4191
4192 case FC_BSG_RPT_CT:
4193 cmdlen += sizeof(struct fc_bsg_rport_ct);
4194 check_bidi:
4195 /* there better be xmt and rcv payloads */
4196 if ((!job->request_payload.payload_len) ||
4197 (!job->reply_payload.payload_len)) {
4198 ret = -EINVAL;
4199 goto fail_rport_msg;
4200 }
4201 break;
4202 default:
4203 ret = -EBADR;
4204 goto fail_rport_msg;
4205 }
4206
4207 ret = i->f->bsg_request(job);
4208 if (!ret)
4209 return 0;
4210
4211 fail_rport_msg:
4212 /* return the errno failure code as the only status */
4213 BUG_ON(job->reply_len < sizeof(uint32_t));
4214 bsg_reply->reply_payload_rcv_len = 0;
4215 bsg_reply->result = ret;
4216 job->reply_len = sizeof(uint32_t);
4217 bsg_job_done(job, bsg_reply->result,
4218 bsg_reply->reply_payload_rcv_len);
4219 return 0;
4220 }
4221
fc_bsg_dispatch(struct bsg_job * job)4222 static int fc_bsg_dispatch(struct bsg_job *job)
4223 {
4224 struct Scsi_Host *shost = fc_bsg_to_shost(job);
4225
4226 if (scsi_is_fc_rport(job->dev))
4227 return fc_bsg_rport_dispatch(shost, job);
4228 else
4229 return fc_bsg_host_dispatch(shost, job);
4230 }
4231
fc_bsg_rport_prep(struct fc_rport * rport)4232 static blk_status_t fc_bsg_rport_prep(struct fc_rport *rport)
4233 {
4234 if (rport->port_state == FC_PORTSTATE_BLOCKED &&
4235 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
4236 return BLK_STS_RESOURCE;
4237
4238 if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
4239 (rport->port_state != FC_PORTSTATE_MARGINAL))
4240 return BLK_STS_IOERR;
4241
4242 return BLK_STS_OK;
4243 }
4244
4245
fc_bsg_dispatch_prep(struct bsg_job * job)4246 static int fc_bsg_dispatch_prep(struct bsg_job *job)
4247 {
4248 struct fc_rport *rport = fc_bsg_to_rport(job);
4249 blk_status_t ret;
4250
4251 ret = fc_bsg_rport_prep(rport);
4252 switch (ret) {
4253 case BLK_STS_OK:
4254 break;
4255 case BLK_STS_RESOURCE:
4256 return -EAGAIN;
4257 default:
4258 return -EIO;
4259 }
4260
4261 return fc_bsg_dispatch(job);
4262 }
4263
4264 /**
4265 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
4266 * @shost: shost for fc_host
4267 * @fc_host: fc_host adding the structures to
4268 */
4269 static int
fc_bsg_hostadd(struct Scsi_Host * shost,struct fc_host_attrs * fc_host)4270 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
4271 {
4272 struct device *dev = &shost->shost_gendev;
4273 struct fc_internal *i = to_fc_internal(shost->transportt);
4274 struct queue_limits lim;
4275 struct request_queue *q;
4276 char bsg_name[20];
4277
4278 fc_host->rqst_q = NULL;
4279
4280 if (!i->f->bsg_request)
4281 return -ENOTSUPP;
4282
4283 snprintf(bsg_name, sizeof(bsg_name),
4284 "fc_host%d", shost->host_no);
4285 scsi_init_limits(shost, &lim);
4286 lim.max_segments = min_not_zero(lim.max_segments, i->f->max_bsg_segments);
4287 q = bsg_setup_queue(dev, bsg_name, &lim, fc_bsg_dispatch,
4288 fc_bsg_job_timeout, i->f->dd_bsg_size);
4289 if (IS_ERR(q)) {
4290 dev_err(dev,
4291 "fc_host%d: bsg interface failed to initialize - setup queue\n",
4292 shost->host_no);
4293 return PTR_ERR(q);
4294 }
4295 blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4296 fc_host->rqst_q = q;
4297 return 0;
4298 }
4299
4300 /**
4301 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4302 * @shost: shost that rport is attached to
4303 * @rport: rport that the bsg hooks are being attached to
4304 */
4305 static int
fc_bsg_rportadd(struct Scsi_Host * shost,struct fc_rport * rport)4306 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4307 {
4308 struct device *dev = &rport->dev;
4309 struct fc_internal *i = to_fc_internal(shost->transportt);
4310 struct queue_limits lim;
4311 struct request_queue *q;
4312
4313 rport->rqst_q = NULL;
4314
4315 if (!i->f->bsg_request)
4316 return -ENOTSUPP;
4317
4318 scsi_init_limits(shost, &lim);
4319 lim.max_segments = min_not_zero(lim.max_segments, i->f->max_bsg_segments);
4320 q = bsg_setup_queue(dev, dev_name(dev), &lim, fc_bsg_dispatch_prep,
4321 fc_bsg_job_timeout, i->f->dd_bsg_size);
4322 if (IS_ERR(q)) {
4323 dev_err(dev, "failed to setup bsg queue\n");
4324 return PTR_ERR(q);
4325 }
4326 blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4327 rport->rqst_q = q;
4328 return 0;
4329 }
4330
4331
4332 /**
4333 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4334 * @q: the request_queue that is to be torn down.
4335 *
4336 * Notes:
4337 * Before unregistering the queue empty any requests that are blocked
4338 *
4339 *
4340 */
4341 static void
fc_bsg_remove(struct request_queue * q)4342 fc_bsg_remove(struct request_queue *q)
4343 {
4344 bsg_remove_queue(q);
4345 }
4346
4347
4348 /* Original Author: Martin Hicks */
4349 MODULE_AUTHOR("James Smart");
4350 MODULE_DESCRIPTION("FC Transport Attributes");
4351 MODULE_LICENSE("GPL");
4352
4353 module_init(fc_transport_init);
4354 module_exit(fc_transport_exit);
4355