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", WQ_PERCPU, 0,
445 shost->host_no);
446 if (!fc_host->work_q)
447 return -ENOMEM;
448
449 fc_host->dev_loss_tmo = fc_dev_loss_tmo;
450
451 fc_bsg_hostadd(shost, fc_host);
452 /* ignore any bsg add error - we just can't do sgio */
453
454 return 0;
455 }
456
fc_host_remove(struct transport_container * tc,struct device * dev,struct device * cdev)457 static int fc_host_remove(struct transport_container *tc, struct device *dev,
458 struct device *cdev)
459 {
460 struct Scsi_Host *shost = dev_to_shost(dev);
461 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
462
463 fc_bsg_remove(fc_host->rqst_q);
464 return 0;
465 }
466
467 static DECLARE_TRANSPORT_CLASS(fc_host_class,
468 "fc_host",
469 fc_host_setup,
470 fc_host_remove,
471 NULL);
472
473 /*
474 * Setup and Remove actions for remote ports are handled
475 * in the service functions below.
476 */
477 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
478 "fc_remote_ports",
479 NULL,
480 NULL,
481 NULL);
482
483 /*
484 * Setup and Remove actions for virtual ports are handled
485 * in the service functions below.
486 */
487 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
488 "fc_vports",
489 NULL,
490 NULL,
491 NULL);
492
493 /*
494 * Netlink Infrastructure
495 */
496
497 static atomic_t fc_event_seq;
498
499 /**
500 * fc_get_event_number - Obtain the next sequential FC event number
501 *
502 * Notes:
503 * We could have inlined this, but it would have required fc_event_seq to
504 * be exposed. For now, live with the subroutine call.
505 * Atomic used to avoid lock/unlock...
506 */
507 u32
fc_get_event_number(void)508 fc_get_event_number(void)
509 {
510 return atomic_add_return(1, &fc_event_seq);
511 }
512 EXPORT_SYMBOL(fc_get_event_number);
513
514 /**
515 * fc_host_post_fc_event - routine to do the work of posting an event
516 * on an fc_host.
517 * @shost: host the event occurred on
518 * @event_number: fc event number obtained from get_fc_event_number()
519 * @event_code: fc_host event being posted
520 * @data_len: amount, in bytes, of event data
521 * @data_buf: pointer to event data
522 * @vendor_id: value for Vendor id
523 *
524 * Notes:
525 * This routine assumes no locks are held on entry.
526 */
527 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)528 fc_host_post_fc_event(struct Scsi_Host *shost, u32 event_number,
529 enum fc_host_event_code event_code,
530 u32 data_len, char *data_buf, u64 vendor_id)
531 {
532 struct sk_buff *skb;
533 struct nlmsghdr *nlh;
534 struct fc_nl_event *event;
535 const char *name;
536 size_t len, padding;
537 int err;
538
539 if (!data_buf || data_len < 4)
540 data_len = 0;
541
542 if (!scsi_nl_sock) {
543 err = -ENOENT;
544 goto send_fail;
545 }
546
547 len = FC_NL_MSGALIGN(sizeof(*event) - sizeof(event->event_data) + data_len);
548
549 skb = nlmsg_new(len, GFP_KERNEL);
550 if (!skb) {
551 err = -ENOBUFS;
552 goto send_fail;
553 }
554
555 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
556 if (!nlh) {
557 err = -ENOBUFS;
558 goto send_fail_skb;
559 }
560 event = nlmsg_data(nlh);
561
562 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
563 FC_NL_ASYNC_EVENT, len);
564 event->seconds = ktime_get_real_seconds();
565 event->vendor_id = vendor_id;
566 event->host_no = shost->host_no;
567 event->event_datalen = data_len; /* bytes */
568 event->event_num = event_number;
569 event->event_code = event_code;
570 if (data_len)
571 memcpy(event->event_data_flex, data_buf, data_len);
572 padding = len - offsetof(typeof(*event), event_data_flex) - data_len;
573 memset(event->event_data_flex + data_len, 0, padding);
574
575 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
576 GFP_KERNEL);
577 return;
578
579 send_fail_skb:
580 kfree_skb(skb);
581 send_fail:
582 name = get_fc_host_event_code_name(event_code);
583 printk(KERN_WARNING
584 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
585 __func__, shost->host_no,
586 (name) ? name : "<unknown>",
587 (data_len) ? *((u32 *)data_buf) : 0xFFFFFFFF, err);
588 return;
589 }
590 EXPORT_SYMBOL(fc_host_post_fc_event);
591
592 /**
593 * fc_host_post_event - called to post an even on an fc_host.
594 * @shost: host the event occurred on
595 * @event_number: fc event number obtained from get_fc_event_number()
596 * @event_code: fc_host event being posted
597 * @event_data: 32bits of data for the event being posted
598 *
599 * Notes:
600 * This routine assumes no locks are held on entry.
601 */
602 void
fc_host_post_event(struct Scsi_Host * shost,u32 event_number,enum fc_host_event_code event_code,u32 event_data)603 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
604 enum fc_host_event_code event_code, u32 event_data)
605 {
606 fc_host_post_fc_event(shost, event_number, event_code,
607 (u32)sizeof(u32), (char *)&event_data, 0);
608 }
609 EXPORT_SYMBOL(fc_host_post_event);
610
611
612 /**
613 * fc_host_post_vendor_event - called to post a vendor unique event
614 * on an fc_host
615 * @shost: host the event occurred on
616 * @event_number: fc event number obtained from get_fc_event_number()
617 * @data_len: amount, in bytes, of vendor unique data
618 * @data_buf: pointer to vendor unique data
619 * @vendor_id: Vendor id
620 *
621 * Notes:
622 * This routine assumes no locks are held on entry.
623 */
624 void
fc_host_post_vendor_event(struct Scsi_Host * shost,u32 event_number,u32 data_len,char * data_buf,u64 vendor_id)625 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
626 u32 data_len, char * data_buf, u64 vendor_id)
627 {
628 fc_host_post_fc_event(shost, event_number, FCH_EVT_VENDOR_UNIQUE,
629 data_len, data_buf, vendor_id);
630 }
631 EXPORT_SYMBOL(fc_host_post_vendor_event);
632
633 /**
634 * fc_find_rport_by_wwpn - find the fc_rport pointer for a given wwpn
635 * @shost: host the fc_rport is associated with
636 * @wwpn: wwpn of the fc_rport device
637 *
638 * Notes:
639 * This routine assumes no locks are held on entry.
640 */
641 struct fc_rport *
fc_find_rport_by_wwpn(struct Scsi_Host * shost,u64 wwpn)642 fc_find_rport_by_wwpn(struct Scsi_Host *shost, u64 wwpn)
643 {
644 struct fc_rport *rport;
645 unsigned long flags;
646
647 spin_lock_irqsave(shost->host_lock, flags);
648
649 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
650 if (rport->port_state != FC_PORTSTATE_ONLINE)
651 continue;
652
653 if (rport->port_name == wwpn) {
654 spin_unlock_irqrestore(shost->host_lock, flags);
655 return rport;
656 }
657 }
658
659 spin_unlock_irqrestore(shost->host_lock, flags);
660 return NULL;
661 }
662 EXPORT_SYMBOL(fc_find_rport_by_wwpn);
663
664 static void
fc_li_stats_update(u16 event_type,struct fc_fpin_stats * stats)665 fc_li_stats_update(u16 event_type,
666 struct fc_fpin_stats *stats)
667 {
668 stats->li++;
669 switch (event_type) {
670 case FPIN_LI_UNKNOWN:
671 stats->li_failure_unknown++;
672 break;
673 case FPIN_LI_LINK_FAILURE:
674 stats->li_link_failure_count++;
675 break;
676 case FPIN_LI_LOSS_OF_SYNC:
677 stats->li_loss_of_sync_count++;
678 break;
679 case FPIN_LI_LOSS_OF_SIG:
680 stats->li_loss_of_signals_count++;
681 break;
682 case FPIN_LI_PRIM_SEQ_ERR:
683 stats->li_prim_seq_err_count++;
684 break;
685 case FPIN_LI_INVALID_TX_WD:
686 stats->li_invalid_tx_word_count++;
687 break;
688 case FPIN_LI_INVALID_CRC:
689 stats->li_invalid_crc_count++;
690 break;
691 case FPIN_LI_DEVICE_SPEC:
692 stats->li_device_specific++;
693 break;
694 }
695 }
696
697 static void
fc_delivery_stats_update(u32 reason_code,struct fc_fpin_stats * stats)698 fc_delivery_stats_update(u32 reason_code, struct fc_fpin_stats *stats)
699 {
700 stats->dn++;
701 switch (reason_code) {
702 case FPIN_DELI_UNKNOWN:
703 stats->dn_unknown++;
704 break;
705 case FPIN_DELI_TIMEOUT:
706 stats->dn_timeout++;
707 break;
708 case FPIN_DELI_UNABLE_TO_ROUTE:
709 stats->dn_unable_to_route++;
710 break;
711 case FPIN_DELI_DEVICE_SPEC:
712 stats->dn_device_specific++;
713 break;
714 }
715 }
716
717 static void
fc_cn_stats_update(u16 event_type,struct fc_fpin_stats * stats)718 fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats)
719 {
720 stats->cn++;
721 switch (event_type) {
722 case FPIN_CONGN_CLEAR:
723 stats->cn_clear++;
724 break;
725 case FPIN_CONGN_LOST_CREDIT:
726 stats->cn_lost_credit++;
727 break;
728 case FPIN_CONGN_CREDIT_STALL:
729 stats->cn_credit_stall++;
730 break;
731 case FPIN_CONGN_OVERSUBSCRIPTION:
732 stats->cn_oversubscription++;
733 break;
734 case FPIN_CONGN_DEVICE_SPEC:
735 stats->cn_device_specific++;
736 }
737 }
738
739 /*
740 * fc_fpin_li_stats_update - routine to update Link Integrity
741 * event statistics.
742 * @shost: host the FPIN was received on
743 * @tlv: pointer to link integrity descriptor
744 *
745 */
746 static void
fc_fpin_li_stats_update(struct Scsi_Host * shost,struct fc_tlv_desc * tlv)747 fc_fpin_li_stats_update(struct Scsi_Host *shost, struct fc_tlv_desc *tlv)
748 {
749 u8 i;
750 struct fc_rport *rport = NULL;
751 struct fc_rport *attach_rport = NULL;
752 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
753 struct fc_fn_li_desc *li_desc = (struct fc_fn_li_desc *)tlv;
754 u16 event_type = be16_to_cpu(li_desc->event_type);
755 u64 wwpn;
756
757 rport = fc_find_rport_by_wwpn(shost,
758 be64_to_cpu(li_desc->attached_wwpn));
759 if (rport &&
760 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
761 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
762 attach_rport = rport;
763 fc_li_stats_update(event_type, &attach_rport->fpin_stats);
764 }
765
766 if (be32_to_cpu(li_desc->pname_count) > 0) {
767 for (i = 0;
768 i < be32_to_cpu(li_desc->pname_count);
769 i++) {
770 wwpn = be64_to_cpu(li_desc->pname_list[i]);
771 rport = fc_find_rport_by_wwpn(shost, wwpn);
772 if (rport &&
773 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
774 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
775 if (rport == attach_rport)
776 continue;
777 fc_li_stats_update(event_type,
778 &rport->fpin_stats);
779 }
780 }
781 }
782
783 if (fc_host->port_name == be64_to_cpu(li_desc->attached_wwpn))
784 fc_li_stats_update(event_type, &fc_host->fpin_stats);
785 }
786
787 /*
788 * fc_fpin_delivery_stats_update - routine to update Delivery Notification
789 * event statistics.
790 * @shost: host the FPIN was received on
791 * @tlv: pointer to delivery descriptor
792 *
793 */
794 static void
fc_fpin_delivery_stats_update(struct Scsi_Host * shost,struct fc_tlv_desc * tlv)795 fc_fpin_delivery_stats_update(struct Scsi_Host *shost,
796 struct fc_tlv_desc *tlv)
797 {
798 struct fc_rport *rport = NULL;
799 struct fc_rport *attach_rport = NULL;
800 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
801 struct fc_fn_deli_desc *dn_desc = (struct fc_fn_deli_desc *)tlv;
802 u32 reason_code = be32_to_cpu(dn_desc->deli_reason_code);
803
804 rport = fc_find_rport_by_wwpn(shost,
805 be64_to_cpu(dn_desc->attached_wwpn));
806 if (rport &&
807 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
808 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
809 attach_rport = rport;
810 fc_delivery_stats_update(reason_code,
811 &attach_rport->fpin_stats);
812 }
813
814 if (fc_host->port_name == be64_to_cpu(dn_desc->attached_wwpn))
815 fc_delivery_stats_update(reason_code, &fc_host->fpin_stats);
816 }
817
818 /*
819 * fc_fpin_peer_congn_stats_update - routine to update Peer Congestion
820 * event statistics.
821 * @shost: host the FPIN was received on
822 * @tlv: pointer to peer congestion descriptor
823 *
824 */
825 static void
fc_fpin_peer_congn_stats_update(struct Scsi_Host * shost,struct fc_tlv_desc * tlv)826 fc_fpin_peer_congn_stats_update(struct Scsi_Host *shost,
827 struct fc_tlv_desc *tlv)
828 {
829 u8 i;
830 struct fc_rport *rport = NULL;
831 struct fc_rport *attach_rport = NULL;
832 struct fc_fn_peer_congn_desc *pc_desc =
833 (struct fc_fn_peer_congn_desc *)tlv;
834 u16 event_type = be16_to_cpu(pc_desc->event_type);
835 u64 wwpn;
836
837 rport = fc_find_rport_by_wwpn(shost,
838 be64_to_cpu(pc_desc->attached_wwpn));
839 if (rport &&
840 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
841 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
842 attach_rport = rport;
843 fc_cn_stats_update(event_type, &attach_rport->fpin_stats);
844 }
845
846 if (be32_to_cpu(pc_desc->pname_count) > 0) {
847 for (i = 0;
848 i < be32_to_cpu(pc_desc->pname_count);
849 i++) {
850 wwpn = be64_to_cpu(pc_desc->pname_list[i]);
851 rport = fc_find_rport_by_wwpn(shost, wwpn);
852 if (rport &&
853 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
854 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
855 if (rport == attach_rport)
856 continue;
857 fc_cn_stats_update(event_type,
858 &rport->fpin_stats);
859 }
860 }
861 }
862 }
863
864 /*
865 * fc_fpin_congn_stats_update - routine to update Congestion
866 * event statistics.
867 * @shost: host the FPIN was received on
868 * @tlv: pointer to congestion descriptor
869 *
870 */
871 static void
fc_fpin_congn_stats_update(struct Scsi_Host * shost,struct fc_tlv_desc * tlv)872 fc_fpin_congn_stats_update(struct Scsi_Host *shost,
873 struct fc_tlv_desc *tlv)
874 {
875 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
876 struct fc_fn_congn_desc *congn = (struct fc_fn_congn_desc *)tlv;
877
878 fc_cn_stats_update(be16_to_cpu(congn->event_type),
879 &fc_host->fpin_stats);
880 }
881
882 /**
883 * fc_host_fpin_rcv - routine to process a received FPIN.
884 * @shost: host the FPIN was received on
885 * @fpin_len: length of FPIN payload, in bytes
886 * @fpin_buf: pointer to FPIN payload
887 * @event_acknowledge: 1, if LLDD handles this event.
888 * Notes:
889 * This routine assumes no locks are held on entry.
890 */
891 void
fc_host_fpin_rcv(struct Scsi_Host * shost,u32 fpin_len,char * fpin_buf,u8 event_acknowledge)892 fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf,
893 u8 event_acknowledge)
894 {
895 struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf;
896 struct fc_tlv_desc *tlv;
897 u32 bytes_remain;
898 u32 dtag;
899 enum fc_host_event_code event_code =
900 event_acknowledge ? FCH_EVT_LINK_FPIN_ACK : FCH_EVT_LINK_FPIN;
901
902 /* Update Statistics */
903 tlv = (struct fc_tlv_desc *)&fpin->fpin_desc[0];
904 bytes_remain = fpin_len - offsetof(struct fc_els_fpin, fpin_desc);
905 bytes_remain = min_t(u32, bytes_remain, be32_to_cpu(fpin->desc_len));
906
907 while (bytes_remain >= FC_TLV_DESC_HDR_SZ &&
908 bytes_remain >= FC_TLV_DESC_SZ_FROM_LENGTH(tlv)) {
909 dtag = be32_to_cpu(tlv->desc_tag);
910 switch (dtag) {
911 case ELS_DTAG_LNK_INTEGRITY:
912 fc_fpin_li_stats_update(shost, tlv);
913 break;
914 case ELS_DTAG_DELIVERY:
915 fc_fpin_delivery_stats_update(shost, tlv);
916 break;
917 case ELS_DTAG_PEER_CONGEST:
918 fc_fpin_peer_congn_stats_update(shost, tlv);
919 break;
920 case ELS_DTAG_CONGESTION:
921 fc_fpin_congn_stats_update(shost, tlv);
922 }
923
924 bytes_remain -= FC_TLV_DESC_SZ_FROM_LENGTH(tlv);
925 tlv = fc_tlv_next_desc(tlv);
926 }
927
928 fc_host_post_fc_event(shost, fc_get_event_number(),
929 event_code, fpin_len, fpin_buf, 0);
930 }
931 EXPORT_SYMBOL(fc_host_fpin_rcv);
932
933
fc_transport_init(void)934 static __init int fc_transport_init(void)
935 {
936 int error;
937
938 atomic_set(&fc_event_seq, 0);
939
940 error = transport_class_register(&fc_host_class);
941 if (error)
942 return error;
943 error = transport_class_register(&fc_vport_class);
944 if (error)
945 goto unreg_host_class;
946 error = transport_class_register(&fc_rport_class);
947 if (error)
948 goto unreg_vport_class;
949 error = transport_class_register(&fc_transport_class);
950 if (error)
951 goto unreg_rport_class;
952 return 0;
953
954 unreg_rport_class:
955 transport_class_unregister(&fc_rport_class);
956 unreg_vport_class:
957 transport_class_unregister(&fc_vport_class);
958 unreg_host_class:
959 transport_class_unregister(&fc_host_class);
960 return error;
961 }
962
fc_transport_exit(void)963 static void __exit fc_transport_exit(void)
964 {
965 transport_class_unregister(&fc_transport_class);
966 transport_class_unregister(&fc_rport_class);
967 transport_class_unregister(&fc_host_class);
968 transport_class_unregister(&fc_vport_class);
969 }
970
971 /*
972 * FC Remote Port Attribute Management
973 */
974
975 #define fc_rport_show_function(field, format_string, sz, cast) \
976 static ssize_t \
977 show_fc_rport_##field (struct device *dev, \
978 struct device_attribute *attr, char *buf) \
979 { \
980 struct fc_rport *rport = transport_class_to_rport(dev); \
981 struct Scsi_Host *shost = rport_to_shost(rport); \
982 struct fc_internal *i = to_fc_internal(shost->transportt); \
983 if ((i->f->get_rport_##field) && \
984 !((rport->port_state == FC_PORTSTATE_BLOCKED) || \
985 (rport->port_state == FC_PORTSTATE_DELETED) || \
986 (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
987 i->f->get_rport_##field(rport); \
988 return snprintf(buf, sz, format_string, cast rport->field); \
989 }
990
991 #define fc_rport_store_function(field) \
992 static ssize_t \
993 store_fc_rport_##field(struct device *dev, \
994 struct device_attribute *attr, \
995 const char *buf, size_t count) \
996 { \
997 int val; \
998 struct fc_rport *rport = transport_class_to_rport(dev); \
999 struct Scsi_Host *shost = rport_to_shost(rport); \
1000 struct fc_internal *i = to_fc_internal(shost->transportt); \
1001 char *cp; \
1002 if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
1003 (rport->port_state == FC_PORTSTATE_DELETED) || \
1004 (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
1005 return -EBUSY; \
1006 val = simple_strtoul(buf, &cp, 0); \
1007 if (*cp && (*cp != '\n')) \
1008 return -EINVAL; \
1009 i->f->set_rport_##field(rport, val); \
1010 return count; \
1011 }
1012
1013 #define fc_rport_rd_attr(field, format_string, sz) \
1014 fc_rport_show_function(field, format_string, sz, ) \
1015 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1016 show_fc_rport_##field, NULL)
1017
1018 #define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
1019 fc_rport_show_function(field, format_string, sz, (cast)) \
1020 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1021 show_fc_rport_##field, NULL)
1022
1023 #define fc_rport_rw_attr(field, format_string, sz) \
1024 fc_rport_show_function(field, format_string, sz, ) \
1025 fc_rport_store_function(field) \
1026 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
1027 show_fc_rport_##field, \
1028 store_fc_rport_##field)
1029
1030
1031 #define fc_private_rport_show_function(field, format_string, sz, cast) \
1032 static ssize_t \
1033 show_fc_rport_##field (struct device *dev, \
1034 struct device_attribute *attr, char *buf) \
1035 { \
1036 struct fc_rport *rport = transport_class_to_rport(dev); \
1037 return snprintf(buf, sz, format_string, cast rport->field); \
1038 }
1039
1040 #define fc_private_rport_rd_attr(field, format_string, sz) \
1041 fc_private_rport_show_function(field, format_string, sz, ) \
1042 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1043 show_fc_rport_##field, NULL)
1044
1045 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
1046 fc_private_rport_show_function(field, format_string, sz, (cast)) \
1047 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1048 show_fc_rport_##field, NULL)
1049
1050
1051 #define fc_private_rport_rd_enum_attr(title, maxlen) \
1052 static ssize_t \
1053 show_fc_rport_##title (struct device *dev, \
1054 struct device_attribute *attr, char *buf) \
1055 { \
1056 struct fc_rport *rport = transport_class_to_rport(dev); \
1057 const char *name; \
1058 name = get_fc_##title##_name(rport->title); \
1059 if (!name) \
1060 return -EINVAL; \
1061 return snprintf(buf, maxlen, "%s\n", name); \
1062 } \
1063 static FC_DEVICE_ATTR(rport, title, S_IRUGO, \
1064 show_fc_rport_##title, NULL)
1065
1066
1067 #define SETUP_RPORT_ATTRIBUTE_RD(field) \
1068 i->private_rport_attrs[count] = device_attr_rport_##field; \
1069 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
1070 i->private_rport_attrs[count].store = NULL; \
1071 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1072 if (i->f->show_rport_##field) \
1073 count++
1074
1075 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
1076 i->private_rport_attrs[count] = device_attr_rport_##field; \
1077 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
1078 i->private_rport_attrs[count].store = NULL; \
1079 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1080 count++
1081
1082 #define SETUP_RPORT_ATTRIBUTE_RW(field) \
1083 i->private_rport_attrs[count] = device_attr_rport_##field; \
1084 if (!i->f->set_rport_##field) { \
1085 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
1086 i->private_rport_attrs[count].store = NULL; \
1087 } \
1088 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1089 if (i->f->show_rport_##field) \
1090 count++
1091
1092 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
1093 { \
1094 i->private_rport_attrs[count] = device_attr_rport_##field; \
1095 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1096 count++; \
1097 }
1098
1099
1100 /* The FC Transport Remote Port Attributes: */
1101
1102 /* Fixed Remote Port Attributes */
1103
1104 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
1105
1106 static ssize_t
show_fc_rport_supported_classes(struct device * dev,struct device_attribute * attr,char * buf)1107 show_fc_rport_supported_classes (struct device *dev,
1108 struct device_attribute *attr, char *buf)
1109 {
1110 struct fc_rport *rport = transport_class_to_rport(dev);
1111 if (rport->supported_classes == FC_COS_UNSPECIFIED)
1112 return snprintf(buf, 20, "unspecified\n");
1113 return get_fc_cos_names(rport->supported_classes, buf);
1114 }
1115 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
1116 show_fc_rport_supported_classes, NULL);
1117
1118 /* Dynamic Remote Port Attributes */
1119
1120 /*
1121 * dev_loss_tmo attribute
1122 */
fc_str_to_dev_loss(const char * buf,unsigned long * val)1123 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
1124 {
1125 char *cp;
1126
1127 *val = simple_strtoul(buf, &cp, 0);
1128 if (*cp && (*cp != '\n'))
1129 return -EINVAL;
1130 /*
1131 * Check for overflow; dev_loss_tmo is u32
1132 */
1133 if (*val > UINT_MAX)
1134 return -EINVAL;
1135
1136 return 0;
1137 }
1138
fc_rport_set_dev_loss_tmo(struct fc_rport * rport,unsigned long val)1139 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
1140 unsigned long val)
1141 {
1142 struct Scsi_Host *shost = rport_to_shost(rport);
1143 struct fc_internal *i = to_fc_internal(shost->transportt);
1144
1145 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
1146 (rport->port_state == FC_PORTSTATE_DELETED) ||
1147 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
1148 return -EBUSY;
1149 /*
1150 * Check for overflow; dev_loss_tmo is u32
1151 */
1152 if (val > UINT_MAX)
1153 return -EINVAL;
1154
1155 /*
1156 * If fast_io_fail is off we have to cap
1157 * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
1158 */
1159 if (rport->fast_io_fail_tmo == -1 &&
1160 val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
1161 return -EINVAL;
1162
1163 i->f->set_rport_dev_loss_tmo(rport, val);
1164 return 0;
1165 }
1166
1167 fc_rport_show_function(dev_loss_tmo, "%u\n", 20, )
1168 static ssize_t
store_fc_rport_dev_loss_tmo(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1169 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
1170 const char *buf, size_t count)
1171 {
1172 struct fc_rport *rport = transport_class_to_rport(dev);
1173 unsigned long val;
1174 int rc;
1175
1176 rc = fc_str_to_dev_loss(buf, &val);
1177 if (rc)
1178 return rc;
1179
1180 rc = fc_rport_set_dev_loss_tmo(rport, val);
1181 if (rc)
1182 return rc;
1183 return count;
1184 }
1185 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
1186 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
1187
1188
1189 /* Private Remote Port Attributes */
1190
1191 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1192 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1193 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
1194
1195 static ssize_t
show_fc_rport_roles(struct device * dev,struct device_attribute * attr,char * buf)1196 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
1197 char *buf)
1198 {
1199 struct fc_rport *rport = transport_class_to_rport(dev);
1200
1201 /* identify any roles that are port_id specific */
1202 if ((rport->port_id != -1) &&
1203 (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
1204 FC_WELLKNOWN_PORTID_MASK) {
1205 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
1206 case FC_FPORT_PORTID:
1207 return snprintf(buf, 30, "Fabric Port\n");
1208 case FC_FABCTLR_PORTID:
1209 return snprintf(buf, 30, "Fabric Controller\n");
1210 case FC_DIRSRVR_PORTID:
1211 return snprintf(buf, 30, "Directory Server\n");
1212 case FC_TIMESRVR_PORTID:
1213 return snprintf(buf, 30, "Time Server\n");
1214 case FC_MGMTSRVR_PORTID:
1215 return snprintf(buf, 30, "Management Server\n");
1216 default:
1217 return snprintf(buf, 30, "Unknown Fabric Entity\n");
1218 }
1219 } else {
1220 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
1221 return snprintf(buf, 20, "unknown\n");
1222 return get_fc_port_roles_names(rport->roles, buf);
1223 }
1224 }
1225 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
1226 show_fc_rport_roles, NULL);
1227
fc_rport_set_marginal_state(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1228 static ssize_t fc_rport_set_marginal_state(struct device *dev,
1229 struct device_attribute *attr,
1230 const char *buf, size_t count)
1231 {
1232 struct fc_rport *rport = transport_class_to_rport(dev);
1233 enum fc_port_state port_state;
1234 int ret = 0;
1235
1236 ret = get_fc_port_state_match(buf, &port_state);
1237 if (ret)
1238 return -EINVAL;
1239 if (port_state == FC_PORTSTATE_MARGINAL) {
1240 /*
1241 * Change the state to Marginal only if the
1242 * current rport state is Online
1243 * Allow only Online->Marginal
1244 */
1245 if (rport->port_state == FC_PORTSTATE_ONLINE)
1246 rport->port_state = port_state;
1247 else if (port_state != rport->port_state)
1248 return -EINVAL;
1249 } else if (port_state == FC_PORTSTATE_ONLINE) {
1250 /*
1251 * Change the state to Online only if the
1252 * current rport state is Marginal
1253 * Allow only Marginal->Online
1254 */
1255 if (rport->port_state == FC_PORTSTATE_MARGINAL)
1256 rport->port_state = port_state;
1257 else if (port_state != rport->port_state)
1258 return -EINVAL;
1259 } else
1260 return -EINVAL;
1261 return count;
1262 }
1263
1264 static ssize_t
show_fc_rport_port_state(struct device * dev,struct device_attribute * attr,char * buf)1265 show_fc_rport_port_state(struct device *dev,
1266 struct device_attribute *attr, char *buf)
1267 {
1268 const char *name;
1269 struct fc_rport *rport = transport_class_to_rport(dev);
1270
1271 name = get_fc_port_state_name(rport->port_state);
1272 if (!name)
1273 return -EINVAL;
1274
1275 return snprintf(buf, 20, "%s\n", name);
1276 }
1277
1278 static FC_DEVICE_ATTR(rport, port_state, 0444 | 0200,
1279 show_fc_rport_port_state, fc_rport_set_marginal_state);
1280
1281 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
1282
1283 /*
1284 * fast_io_fail_tmo attribute
1285 */
1286 static ssize_t
show_fc_rport_fast_io_fail_tmo(struct device * dev,struct device_attribute * attr,char * buf)1287 show_fc_rport_fast_io_fail_tmo (struct device *dev,
1288 struct device_attribute *attr, char *buf)
1289 {
1290 struct fc_rport *rport = transport_class_to_rport(dev);
1291
1292 if (rport->fast_io_fail_tmo == -1)
1293 return snprintf(buf, 5, "off\n");
1294 return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
1295 }
1296
1297 static ssize_t
store_fc_rport_fast_io_fail_tmo(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1298 store_fc_rport_fast_io_fail_tmo(struct device *dev,
1299 struct device_attribute *attr, const char *buf,
1300 size_t count)
1301 {
1302 int val;
1303 char *cp;
1304 struct fc_rport *rport = transport_class_to_rport(dev);
1305
1306 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
1307 (rport->port_state == FC_PORTSTATE_DELETED) ||
1308 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
1309 return -EBUSY;
1310 if (strncmp(buf, "off", 3) == 0)
1311 rport->fast_io_fail_tmo = -1;
1312 else {
1313 val = simple_strtoul(buf, &cp, 0);
1314 if ((*cp && (*cp != '\n')) || (val < 0))
1315 return -EINVAL;
1316 /*
1317 * Cap fast_io_fail by dev_loss_tmo or
1318 * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
1319 */
1320 if ((val >= rport->dev_loss_tmo) ||
1321 (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
1322 return -EINVAL;
1323
1324 rport->fast_io_fail_tmo = val;
1325 }
1326 return count;
1327 }
1328 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
1329 show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
1330
1331 #define fc_rport_fpin_statistic(name) \
1332 static ssize_t fc_rport_fpinstat_##name(struct device *cd, \
1333 struct device_attribute *attr, \
1334 char *buf) \
1335 { \
1336 struct fc_rport *rport = transport_class_to_rport(cd); \
1337 \
1338 return snprintf(buf, 20, "0x%llx\n", rport->fpin_stats.name); \
1339 } \
1340 static FC_DEVICE_ATTR(rport, fpin_##name, 0444, fc_rport_fpinstat_##name, NULL)
1341
1342 fc_rport_fpin_statistic(dn);
1343 fc_rport_fpin_statistic(dn_unknown);
1344 fc_rport_fpin_statistic(dn_timeout);
1345 fc_rport_fpin_statistic(dn_unable_to_route);
1346 fc_rport_fpin_statistic(dn_device_specific);
1347 fc_rport_fpin_statistic(cn);
1348 fc_rport_fpin_statistic(cn_clear);
1349 fc_rport_fpin_statistic(cn_lost_credit);
1350 fc_rport_fpin_statistic(cn_credit_stall);
1351 fc_rport_fpin_statistic(cn_oversubscription);
1352 fc_rport_fpin_statistic(cn_device_specific);
1353 fc_rport_fpin_statistic(li);
1354 fc_rport_fpin_statistic(li_failure_unknown);
1355 fc_rport_fpin_statistic(li_link_failure_count);
1356 fc_rport_fpin_statistic(li_loss_of_sync_count);
1357 fc_rport_fpin_statistic(li_loss_of_signals_count);
1358 fc_rport_fpin_statistic(li_prim_seq_err_count);
1359 fc_rport_fpin_statistic(li_invalid_tx_word_count);
1360 fc_rport_fpin_statistic(li_invalid_crc_count);
1361 fc_rport_fpin_statistic(li_device_specific);
1362
1363 static struct attribute *fc_rport_statistics_attrs[] = {
1364 &device_attr_rport_fpin_dn.attr,
1365 &device_attr_rport_fpin_dn_unknown.attr,
1366 &device_attr_rport_fpin_dn_timeout.attr,
1367 &device_attr_rport_fpin_dn_unable_to_route.attr,
1368 &device_attr_rport_fpin_dn_device_specific.attr,
1369 &device_attr_rport_fpin_li.attr,
1370 &device_attr_rport_fpin_li_failure_unknown.attr,
1371 &device_attr_rport_fpin_li_link_failure_count.attr,
1372 &device_attr_rport_fpin_li_loss_of_sync_count.attr,
1373 &device_attr_rport_fpin_li_loss_of_signals_count.attr,
1374 &device_attr_rport_fpin_li_prim_seq_err_count.attr,
1375 &device_attr_rport_fpin_li_invalid_tx_word_count.attr,
1376 &device_attr_rport_fpin_li_invalid_crc_count.attr,
1377 &device_attr_rport_fpin_li_device_specific.attr,
1378 &device_attr_rport_fpin_cn.attr,
1379 &device_attr_rport_fpin_cn_clear.attr,
1380 &device_attr_rport_fpin_cn_lost_credit.attr,
1381 &device_attr_rport_fpin_cn_credit_stall.attr,
1382 &device_attr_rport_fpin_cn_oversubscription.attr,
1383 &device_attr_rport_fpin_cn_device_specific.attr,
1384 NULL
1385 };
1386
1387 static struct attribute_group fc_rport_statistics_group = {
1388 .name = "statistics",
1389 .attrs = fc_rport_statistics_attrs,
1390 };
1391
1392
1393 /*
1394 * FC SCSI Target Attribute Management
1395 */
1396
1397 /*
1398 * Note: in the target show function we recognize when the remote
1399 * port is in the hierarchy and do not allow the driver to get
1400 * involved in sysfs functions. The driver only gets involved if
1401 * it's the "old" style that doesn't use rports.
1402 */
1403 #define fc_starget_show_function(field, format_string, sz, cast) \
1404 static ssize_t \
1405 show_fc_starget_##field (struct device *dev, \
1406 struct device_attribute *attr, char *buf) \
1407 { \
1408 struct scsi_target *starget = transport_class_to_starget(dev); \
1409 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
1410 struct fc_internal *i = to_fc_internal(shost->transportt); \
1411 struct fc_rport *rport = starget_to_rport(starget); \
1412 if (rport) \
1413 fc_starget_##field(starget) = rport->field; \
1414 else if (i->f->get_starget_##field) \
1415 i->f->get_starget_##field(starget); \
1416 return snprintf(buf, sz, format_string, \
1417 cast fc_starget_##field(starget)); \
1418 }
1419
1420 #define fc_starget_rd_attr(field, format_string, sz) \
1421 fc_starget_show_function(field, format_string, sz, ) \
1422 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1423 show_fc_starget_##field, NULL)
1424
1425 #define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
1426 fc_starget_show_function(field, format_string, sz, (cast)) \
1427 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1428 show_fc_starget_##field, NULL)
1429
1430 #define SETUP_STARGET_ATTRIBUTE_RD(field) \
1431 i->private_starget_attrs[count] = device_attr_starget_##field; \
1432 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1433 i->private_starget_attrs[count].store = NULL; \
1434 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1435 if (i->f->show_starget_##field) \
1436 count++
1437
1438 #define SETUP_STARGET_ATTRIBUTE_RW(field) \
1439 i->private_starget_attrs[count] = device_attr_starget_##field; \
1440 if (!i->f->set_starget_##field) { \
1441 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1442 i->private_starget_attrs[count].store = NULL; \
1443 } \
1444 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1445 if (i->f->show_starget_##field) \
1446 count++
1447
1448 /* The FC Transport SCSI Target Attributes: */
1449 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1450 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1451 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1452
1453
1454 /*
1455 * FC Virtual Port Attribute Management
1456 */
1457
1458 #define fc_vport_show_function(field, format_string, sz, cast) \
1459 static ssize_t \
1460 show_fc_vport_##field (struct device *dev, \
1461 struct device_attribute *attr, char *buf) \
1462 { \
1463 struct fc_vport *vport = transport_class_to_vport(dev); \
1464 struct Scsi_Host *shost = vport_to_shost(vport); \
1465 struct fc_internal *i = to_fc_internal(shost->transportt); \
1466 if ((i->f->get_vport_##field) && \
1467 !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))) \
1468 i->f->get_vport_##field(vport); \
1469 return snprintf(buf, sz, format_string, cast vport->field); \
1470 }
1471
1472 #define fc_vport_store_function(field) \
1473 static ssize_t \
1474 store_fc_vport_##field(struct device *dev, \
1475 struct device_attribute *attr, \
1476 const char *buf, size_t count) \
1477 { \
1478 int val; \
1479 struct fc_vport *vport = transport_class_to_vport(dev); \
1480 struct Scsi_Host *shost = vport_to_shost(vport); \
1481 struct fc_internal *i = to_fc_internal(shost->transportt); \
1482 char *cp; \
1483 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1484 return -EBUSY; \
1485 val = simple_strtoul(buf, &cp, 0); \
1486 if (*cp && (*cp != '\n')) \
1487 return -EINVAL; \
1488 i->f->set_vport_##field(vport, val); \
1489 return count; \
1490 }
1491
1492 #define fc_vport_store_str_function(field, slen) \
1493 static ssize_t \
1494 store_fc_vport_##field(struct device *dev, \
1495 struct device_attribute *attr, \
1496 const char *buf, size_t count) \
1497 { \
1498 struct fc_vport *vport = transport_class_to_vport(dev); \
1499 struct Scsi_Host *shost = vport_to_shost(vport); \
1500 struct fc_internal *i = to_fc_internal(shost->transportt); \
1501 unsigned int cnt=count; \
1502 \
1503 /* count may include a LF at end of string */ \
1504 if (buf[cnt-1] == '\n') \
1505 cnt--; \
1506 if (cnt > ((slen) - 1)) \
1507 return -EINVAL; \
1508 memcpy(vport->field, buf, cnt); \
1509 i->f->set_vport_##field(vport); \
1510 return count; \
1511 }
1512
1513 #define fc_vport_rd_attr(field, format_string, sz) \
1514 fc_vport_show_function(field, format_string, sz, ) \
1515 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1516 show_fc_vport_##field, NULL)
1517
1518 #define fc_vport_rd_attr_cast(field, format_string, sz, cast) \
1519 fc_vport_show_function(field, format_string, sz, (cast)) \
1520 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1521 show_fc_vport_##field, NULL)
1522
1523 #define fc_vport_rw_attr(field, format_string, sz) \
1524 fc_vport_show_function(field, format_string, sz, ) \
1525 fc_vport_store_function(field) \
1526 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1527 show_fc_vport_##field, \
1528 store_fc_vport_##field)
1529
1530 #define fc_private_vport_show_function(field, format_string, sz, cast) \
1531 static ssize_t \
1532 show_fc_vport_##field (struct device *dev, \
1533 struct device_attribute *attr, char *buf) \
1534 { \
1535 struct fc_vport *vport = transport_class_to_vport(dev); \
1536 return snprintf(buf, sz, format_string, cast vport->field); \
1537 }
1538
1539 #define fc_private_vport_store_u32_function(field) \
1540 static ssize_t \
1541 store_fc_vport_##field(struct device *dev, \
1542 struct device_attribute *attr, \
1543 const char *buf, size_t count) \
1544 { \
1545 u32 val; \
1546 struct fc_vport *vport = transport_class_to_vport(dev); \
1547 char *cp; \
1548 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1549 return -EBUSY; \
1550 val = simple_strtoul(buf, &cp, 0); \
1551 if (*cp && (*cp != '\n')) \
1552 return -EINVAL; \
1553 vport->field = val; \
1554 return count; \
1555 }
1556
1557
1558 #define fc_private_vport_rd_attr(field, format_string, sz) \
1559 fc_private_vport_show_function(field, format_string, sz, ) \
1560 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1561 show_fc_vport_##field, NULL)
1562
1563 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast) \
1564 fc_private_vport_show_function(field, format_string, sz, (cast)) \
1565 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1566 show_fc_vport_##field, NULL)
1567
1568 #define fc_private_vport_rw_u32_attr(field, format_string, sz) \
1569 fc_private_vport_show_function(field, format_string, sz, ) \
1570 fc_private_vport_store_u32_function(field) \
1571 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1572 show_fc_vport_##field, \
1573 store_fc_vport_##field)
1574
1575
1576 #define fc_private_vport_rd_enum_attr(title, maxlen) \
1577 static ssize_t \
1578 show_fc_vport_##title (struct device *dev, \
1579 struct device_attribute *attr, \
1580 char *buf) \
1581 { \
1582 struct fc_vport *vport = transport_class_to_vport(dev); \
1583 const char *name; \
1584 name = get_fc_##title##_name(vport->title); \
1585 if (!name) \
1586 return -EINVAL; \
1587 return snprintf(buf, maxlen, "%s\n", name); \
1588 } \
1589 static FC_DEVICE_ATTR(vport, title, S_IRUGO, \
1590 show_fc_vport_##title, NULL)
1591
1592
1593 #define SETUP_VPORT_ATTRIBUTE_RD(field) \
1594 i->private_vport_attrs[count] = device_attr_vport_##field; \
1595 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1596 i->private_vport_attrs[count].store = NULL; \
1597 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1598 if (i->f->get_##field) \
1599 count++
1600 /* NOTE: Above MACRO differs: checks function not show bit */
1601
1602 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field) \
1603 i->private_vport_attrs[count] = device_attr_vport_##field; \
1604 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1605 i->private_vport_attrs[count].store = NULL; \
1606 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1607 count++
1608
1609 #define SETUP_VPORT_ATTRIBUTE_WR(field) \
1610 i->private_vport_attrs[count] = device_attr_vport_##field; \
1611 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1612 if (i->f->field) \
1613 count++
1614 /* NOTE: Above MACRO differs: checks function */
1615
1616 #define SETUP_VPORT_ATTRIBUTE_RW(field) \
1617 i->private_vport_attrs[count] = device_attr_vport_##field; \
1618 if (!i->f->set_vport_##field) { \
1619 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1620 i->private_vport_attrs[count].store = NULL; \
1621 } \
1622 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1623 count++
1624 /* NOTE: Above MACRO differs: does not check show bit */
1625
1626 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field) \
1627 { \
1628 i->private_vport_attrs[count] = device_attr_vport_##field; \
1629 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1630 count++; \
1631 }
1632
1633
1634 /* The FC Transport Virtual Port Attributes: */
1635
1636 /* Fixed Virtual Port Attributes */
1637
1638 /* Dynamic Virtual Port Attributes */
1639
1640 /* Private Virtual Port Attributes */
1641
1642 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1643 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1644 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1645 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1646
1647 static ssize_t
show_fc_vport_roles(struct device * dev,struct device_attribute * attr,char * buf)1648 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1649 char *buf)
1650 {
1651 struct fc_vport *vport = transport_class_to_vport(dev);
1652
1653 if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1654 return snprintf(buf, 20, "unknown\n");
1655 return get_fc_port_roles_names(vport->roles, buf);
1656 }
1657 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1658
1659 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1660
1661 fc_private_vport_show_function(symbolic_name, "%s\n",
1662 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1663 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1664 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1665 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1666
1667 static ssize_t
store_fc_vport_delete(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1668 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1669 const char *buf, size_t count)
1670 {
1671 struct fc_vport *vport = transport_class_to_vport(dev);
1672 struct Scsi_Host *shost = vport_to_shost(vport);
1673 unsigned long flags;
1674
1675 spin_lock_irqsave(shost->host_lock, flags);
1676 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1677 spin_unlock_irqrestore(shost->host_lock, flags);
1678 return -EBUSY;
1679 }
1680 vport->flags |= FC_VPORT_DELETING;
1681 spin_unlock_irqrestore(shost->host_lock, flags);
1682
1683 fc_queue_work(shost, &vport->vport_delete_work);
1684 return count;
1685 }
1686 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1687 NULL, store_fc_vport_delete);
1688
1689
1690 /*
1691 * Enable/Disable vport
1692 * Write "1" to disable, write "0" to enable
1693 */
1694 static ssize_t
store_fc_vport_disable(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1695 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1696 const char *buf,
1697 size_t count)
1698 {
1699 struct fc_vport *vport = transport_class_to_vport(dev);
1700 struct Scsi_Host *shost = vport_to_shost(vport);
1701 struct fc_internal *i = to_fc_internal(shost->transportt);
1702 int stat;
1703
1704 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1705 return -EBUSY;
1706
1707 if (*buf == '0') {
1708 if (vport->vport_state != FC_VPORT_DISABLED)
1709 return -EALREADY;
1710 } else if (*buf == '1') {
1711 if (vport->vport_state == FC_VPORT_DISABLED)
1712 return -EALREADY;
1713 } else
1714 return -EINVAL;
1715
1716 stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1717 return stat ? stat : count;
1718 }
1719 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1720 NULL, store_fc_vport_disable);
1721
1722
1723 /*
1724 * Host Attribute Management
1725 */
1726
1727 #define fc_host_show_function(field, format_string, sz, cast) \
1728 static ssize_t \
1729 show_fc_host_##field (struct device *dev, \
1730 struct device_attribute *attr, char *buf) \
1731 { \
1732 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1733 struct fc_internal *i = to_fc_internal(shost->transportt); \
1734 if (i->f->get_host_##field) \
1735 i->f->get_host_##field(shost); \
1736 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1737 }
1738
1739 #define fc_host_store_function(field) \
1740 static ssize_t \
1741 store_fc_host_##field(struct device *dev, \
1742 struct device_attribute *attr, \
1743 const char *buf, size_t count) \
1744 { \
1745 int val; \
1746 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1747 struct fc_internal *i = to_fc_internal(shost->transportt); \
1748 char *cp; \
1749 \
1750 val = simple_strtoul(buf, &cp, 0); \
1751 if (*cp && (*cp != '\n')) \
1752 return -EINVAL; \
1753 i->f->set_host_##field(shost, val); \
1754 return count; \
1755 }
1756
1757 #define fc_host_store_str_function(field, slen) \
1758 static ssize_t \
1759 store_fc_host_##field(struct device *dev, \
1760 struct device_attribute *attr, \
1761 const char *buf, size_t count) \
1762 { \
1763 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1764 struct fc_internal *i = to_fc_internal(shost->transportt); \
1765 unsigned int cnt=count; \
1766 \
1767 /* count may include a LF at end of string */ \
1768 if (buf[cnt-1] == '\n') \
1769 cnt--; \
1770 if (cnt > ((slen) - 1)) \
1771 return -EINVAL; \
1772 memcpy(fc_host_##field(shost), buf, cnt); \
1773 i->f->set_host_##field(shost); \
1774 return count; \
1775 }
1776
1777 #define fc_host_rd_attr(field, format_string, sz) \
1778 fc_host_show_function(field, format_string, sz, ) \
1779 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1780 show_fc_host_##field, NULL)
1781
1782 #define fc_host_rd_attr_cast(field, format_string, sz, cast) \
1783 fc_host_show_function(field, format_string, sz, (cast)) \
1784 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1785 show_fc_host_##field, NULL)
1786
1787 #define fc_host_rw_attr(field, format_string, sz) \
1788 fc_host_show_function(field, format_string, sz, ) \
1789 fc_host_store_function(field) \
1790 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
1791 show_fc_host_##field, \
1792 store_fc_host_##field)
1793
1794 #define fc_host_rd_enum_attr(title, maxlen) \
1795 static ssize_t \
1796 show_fc_host_##title (struct device *dev, \
1797 struct device_attribute *attr, char *buf) \
1798 { \
1799 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1800 struct fc_internal *i = to_fc_internal(shost->transportt); \
1801 const char *name; \
1802 if (i->f->get_host_##title) \
1803 i->f->get_host_##title(shost); \
1804 name = get_fc_##title##_name(fc_host_##title(shost)); \
1805 if (!name) \
1806 return -EINVAL; \
1807 return snprintf(buf, maxlen, "%s\n", name); \
1808 } \
1809 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1810
1811 #define SETUP_HOST_ATTRIBUTE_RD(field) \
1812 i->private_host_attrs[count] = device_attr_host_##field; \
1813 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1814 i->private_host_attrs[count].store = NULL; \
1815 i->host_attrs[count] = &i->private_host_attrs[count]; \
1816 if (i->f->show_host_##field) \
1817 count++
1818
1819 #define SETUP_HOST_ATTRIBUTE_RD_NS(field) \
1820 i->private_host_attrs[count] = device_attr_host_##field; \
1821 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1822 i->private_host_attrs[count].store = NULL; \
1823 i->host_attrs[count] = &i->private_host_attrs[count]; \
1824 count++
1825
1826 #define SETUP_HOST_ATTRIBUTE_RW(field) \
1827 i->private_host_attrs[count] = device_attr_host_##field; \
1828 if (!i->f->set_host_##field) { \
1829 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1830 i->private_host_attrs[count].store = NULL; \
1831 } \
1832 i->host_attrs[count] = &i->private_host_attrs[count]; \
1833 if (i->f->show_host_##field) \
1834 count++
1835
1836
1837 #define fc_private_host_show_function(field, format_string, sz, cast) \
1838 static ssize_t \
1839 show_fc_host_##field (struct device *dev, \
1840 struct device_attribute *attr, char *buf) \
1841 { \
1842 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1843 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1844 }
1845
1846 #define fc_private_host_rd_attr(field, format_string, sz) \
1847 fc_private_host_show_function(field, format_string, sz, ) \
1848 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1849 show_fc_host_##field, NULL)
1850
1851 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
1852 fc_private_host_show_function(field, format_string, sz, (cast)) \
1853 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1854 show_fc_host_##field, NULL)
1855
1856 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
1857 i->private_host_attrs[count] = device_attr_host_##field; \
1858 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1859 i->private_host_attrs[count].store = NULL; \
1860 i->host_attrs[count] = &i->private_host_attrs[count]; \
1861 count++
1862
1863 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
1864 { \
1865 i->private_host_attrs[count] = device_attr_host_##field; \
1866 i->host_attrs[count] = &i->private_host_attrs[count]; \
1867 count++; \
1868 }
1869
1870
1871 /* Fixed Host Attributes */
1872
1873 static ssize_t
show_fc_host_supported_classes(struct device * dev,struct device_attribute * attr,char * buf)1874 show_fc_host_supported_classes (struct device *dev,
1875 struct device_attribute *attr, char *buf)
1876 {
1877 struct Scsi_Host *shost = transport_class_to_shost(dev);
1878
1879 if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1880 return snprintf(buf, 20, "unspecified\n");
1881
1882 return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1883 }
1884 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1885 show_fc_host_supported_classes, NULL);
1886
1887 static ssize_t
show_fc_host_supported_fc4s(struct device * dev,struct device_attribute * attr,char * buf)1888 show_fc_host_supported_fc4s (struct device *dev,
1889 struct device_attribute *attr, char *buf)
1890 {
1891 struct Scsi_Host *shost = transport_class_to_shost(dev);
1892 return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1893 }
1894 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1895 show_fc_host_supported_fc4s, NULL);
1896
1897 static ssize_t
show_fc_host_supported_speeds(struct device * dev,struct device_attribute * attr,char * buf)1898 show_fc_host_supported_speeds (struct device *dev,
1899 struct device_attribute *attr, char *buf)
1900 {
1901 struct Scsi_Host *shost = transport_class_to_shost(dev);
1902
1903 if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1904 return snprintf(buf, 20, "unknown\n");
1905
1906 return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1907 }
1908 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1909 show_fc_host_supported_speeds, NULL);
1910
1911
1912 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1913 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1914 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1915 unsigned long long);
1916 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1917 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1918 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1919 fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
1920 fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1921 fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1922 fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1923 fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1924 fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1925 fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1926
1927
1928 /* Dynamic Host Attributes */
1929
1930 static ssize_t
show_fc_host_active_fc4s(struct device * dev,struct device_attribute * attr,char * buf)1931 show_fc_host_active_fc4s (struct device *dev,
1932 struct device_attribute *attr, char *buf)
1933 {
1934 struct Scsi_Host *shost = transport_class_to_shost(dev);
1935 struct fc_internal *i = to_fc_internal(shost->transportt);
1936
1937 if (i->f->get_host_active_fc4s)
1938 i->f->get_host_active_fc4s(shost);
1939
1940 return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1941 }
1942 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1943 show_fc_host_active_fc4s, NULL);
1944
1945 static ssize_t
show_fc_host_speed(struct device * dev,struct device_attribute * attr,char * buf)1946 show_fc_host_speed (struct device *dev,
1947 struct device_attribute *attr, char *buf)
1948 {
1949 struct Scsi_Host *shost = transport_class_to_shost(dev);
1950 struct fc_internal *i = to_fc_internal(shost->transportt);
1951
1952 if (i->f->get_host_speed)
1953 i->f->get_host_speed(shost);
1954
1955 if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1956 return snprintf(buf, 20, "unknown\n");
1957
1958 return get_fc_port_speed_names(fc_host_speed(shost), buf);
1959 }
1960 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1961 show_fc_host_speed, NULL);
1962
1963
1964 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1965 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1966 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1967 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1968 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1969
1970 fc_private_host_show_function(system_hostname, "%s\n",
1971 FC_SYMBOLIC_NAME_SIZE + 1, )
1972 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1973 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1974 show_fc_host_system_hostname, store_fc_host_system_hostname);
1975
1976
1977 /* Private Host Attributes */
1978
1979 static ssize_t
show_fc_private_host_tgtid_bind_type(struct device * dev,struct device_attribute * attr,char * buf)1980 show_fc_private_host_tgtid_bind_type(struct device *dev,
1981 struct device_attribute *attr, char *buf)
1982 {
1983 struct Scsi_Host *shost = transport_class_to_shost(dev);
1984 const char *name;
1985
1986 name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1987 if (!name)
1988 return -EINVAL;
1989 return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1990 }
1991
1992 #define get_list_head_entry(pos, head, member) \
1993 pos = list_entry((head)->next, typeof(*pos), member)
1994
1995 static ssize_t
store_fc_private_host_tgtid_bind_type(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1996 store_fc_private_host_tgtid_bind_type(struct device *dev,
1997 struct device_attribute *attr, const char *buf, size_t count)
1998 {
1999 struct Scsi_Host *shost = transport_class_to_shost(dev);
2000 struct fc_rport *rport;
2001 enum fc_tgtid_binding_type val;
2002 unsigned long flags;
2003
2004 if (get_fc_tgtid_bind_type_match(buf, &val))
2005 return -EINVAL;
2006
2007 /* if changing bind type, purge all unused consistent bindings */
2008 if (val != fc_host_tgtid_bind_type(shost)) {
2009 spin_lock_irqsave(shost->host_lock, flags);
2010 while (!list_empty(&fc_host_rport_bindings(shost))) {
2011 get_list_head_entry(rport,
2012 &fc_host_rport_bindings(shost), peers);
2013 list_del(&rport->peers);
2014 rport->port_state = FC_PORTSTATE_DELETED;
2015 fc_queue_work(shost, &rport->rport_delete_work);
2016 }
2017 spin_unlock_irqrestore(shost->host_lock, flags);
2018 }
2019
2020 fc_host_tgtid_bind_type(shost) = val;
2021 return count;
2022 }
2023
2024 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
2025 show_fc_private_host_tgtid_bind_type,
2026 store_fc_private_host_tgtid_bind_type);
2027
2028 static ssize_t
store_fc_private_host_issue_lip(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2029 store_fc_private_host_issue_lip(struct device *dev,
2030 struct device_attribute *attr, const char *buf, size_t count)
2031 {
2032 struct Scsi_Host *shost = transport_class_to_shost(dev);
2033 struct fc_internal *i = to_fc_internal(shost->transportt);
2034 int ret;
2035
2036 /* ignore any data value written to the attribute */
2037 if (i->f->issue_fc_host_lip) {
2038 ret = i->f->issue_fc_host_lip(shost);
2039 return ret ? ret: count;
2040 }
2041
2042 return -ENOENT;
2043 }
2044
2045 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
2046 store_fc_private_host_issue_lip);
2047
2048 static ssize_t
store_fc_private_host_dev_loss_tmo(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2049 store_fc_private_host_dev_loss_tmo(struct device *dev,
2050 struct device_attribute *attr,
2051 const char *buf, size_t count)
2052 {
2053 struct Scsi_Host *shost = transport_class_to_shost(dev);
2054 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2055 struct fc_rport *rport;
2056 unsigned long val, flags;
2057 int rc;
2058
2059 rc = fc_str_to_dev_loss(buf, &val);
2060 if (rc)
2061 return rc;
2062
2063 fc_host_dev_loss_tmo(shost) = val;
2064 spin_lock_irqsave(shost->host_lock, flags);
2065 list_for_each_entry(rport, &fc_host->rports, peers)
2066 fc_rport_set_dev_loss_tmo(rport, val);
2067 spin_unlock_irqrestore(shost->host_lock, flags);
2068 return count;
2069 }
2070
2071 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
2072 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
2073 show_fc_host_dev_loss_tmo,
2074 store_fc_private_host_dev_loss_tmo);
2075
2076 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
2077
2078 /*
2079 * Host Statistics Management
2080 */
2081
2082 /* Show a given attribute in the statistics group */
2083 static ssize_t
fc_stat_show(const struct device * dev,char * buf,unsigned long offset)2084 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
2085 {
2086 struct Scsi_Host *shost = transport_class_to_shost(dev);
2087 struct fc_internal *i = to_fc_internal(shost->transportt);
2088 struct fc_host_statistics *stats;
2089 ssize_t ret = -ENOENT;
2090
2091 if (offset > sizeof(struct fc_host_statistics) ||
2092 offset % sizeof(u64) != 0)
2093 WARN_ON(1);
2094
2095 if (i->f->get_fc_host_stats) {
2096 stats = (i->f->get_fc_host_stats)(shost);
2097 if (stats)
2098 ret = snprintf(buf, 20, "0x%llx\n",
2099 (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
2100 }
2101 return ret;
2102 }
2103
2104
2105 /* generate a read-only statistics attribute */
2106 #define fc_host_statistic(name) \
2107 static ssize_t show_fcstat_##name(struct device *cd, \
2108 struct device_attribute *attr, \
2109 char *buf) \
2110 { \
2111 return fc_stat_show(cd, buf, \
2112 offsetof(struct fc_host_statistics, name)); \
2113 } \
2114 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
2115
2116 fc_host_statistic(seconds_since_last_reset);
2117 fc_host_statistic(tx_frames);
2118 fc_host_statistic(tx_words);
2119 fc_host_statistic(rx_frames);
2120 fc_host_statistic(rx_words);
2121 fc_host_statistic(lip_count);
2122 fc_host_statistic(nos_count);
2123 fc_host_statistic(error_frames);
2124 fc_host_statistic(dumped_frames);
2125 fc_host_statistic(link_failure_count);
2126 fc_host_statistic(loss_of_sync_count);
2127 fc_host_statistic(loss_of_signal_count);
2128 fc_host_statistic(prim_seq_protocol_err_count);
2129 fc_host_statistic(invalid_tx_word_count);
2130 fc_host_statistic(invalid_crc_count);
2131 fc_host_statistic(fcp_input_requests);
2132 fc_host_statistic(fcp_output_requests);
2133 fc_host_statistic(fcp_control_requests);
2134 fc_host_statistic(fcp_input_megabytes);
2135 fc_host_statistic(fcp_output_megabytes);
2136 fc_host_statistic(fcp_packet_alloc_failures);
2137 fc_host_statistic(fcp_packet_aborts);
2138 fc_host_statistic(fcp_frame_alloc_failures);
2139 fc_host_statistic(fc_no_free_exch);
2140 fc_host_statistic(fc_no_free_exch_xid);
2141 fc_host_statistic(fc_xid_not_found);
2142 fc_host_statistic(fc_xid_busy);
2143 fc_host_statistic(fc_seq_not_found);
2144 fc_host_statistic(fc_non_bls_resp);
2145 fc_host_statistic(cn_sig_warn);
2146 fc_host_statistic(cn_sig_alarm);
2147
2148
2149 #define fc_host_fpin_statistic(name) \
2150 static ssize_t fc_host_fpinstat_##name(struct device *cd, \
2151 struct device_attribute *attr, \
2152 char *buf) \
2153 { \
2154 struct Scsi_Host *shost = transport_class_to_shost(cd); \
2155 struct fc_host_attrs *fc_host = shost_to_fc_host(shost); \
2156 \
2157 return snprintf(buf, 20, "0x%llx\n", fc_host->fpin_stats.name); \
2158 } \
2159 static FC_DEVICE_ATTR(host, fpin_##name, 0444, fc_host_fpinstat_##name, NULL)
2160
2161 fc_host_fpin_statistic(dn);
2162 fc_host_fpin_statistic(dn_unknown);
2163 fc_host_fpin_statistic(dn_timeout);
2164 fc_host_fpin_statistic(dn_unable_to_route);
2165 fc_host_fpin_statistic(dn_device_specific);
2166 fc_host_fpin_statistic(cn);
2167 fc_host_fpin_statistic(cn_clear);
2168 fc_host_fpin_statistic(cn_lost_credit);
2169 fc_host_fpin_statistic(cn_credit_stall);
2170 fc_host_fpin_statistic(cn_oversubscription);
2171 fc_host_fpin_statistic(cn_device_specific);
2172 fc_host_fpin_statistic(li);
2173 fc_host_fpin_statistic(li_failure_unknown);
2174 fc_host_fpin_statistic(li_link_failure_count);
2175 fc_host_fpin_statistic(li_loss_of_sync_count);
2176 fc_host_fpin_statistic(li_loss_of_signals_count);
2177 fc_host_fpin_statistic(li_prim_seq_err_count);
2178 fc_host_fpin_statistic(li_invalid_tx_word_count);
2179 fc_host_fpin_statistic(li_invalid_crc_count);
2180 fc_host_fpin_statistic(li_device_specific);
2181
2182 static ssize_t
fc_reset_statistics(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2183 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
2184 const char *buf, size_t count)
2185 {
2186 struct Scsi_Host *shost = transport_class_to_shost(dev);
2187 struct fc_internal *i = to_fc_internal(shost->transportt);
2188
2189 /* ignore any data value written to the attribute */
2190 if (i->f->reset_fc_host_stats) {
2191 i->f->reset_fc_host_stats(shost);
2192 return count;
2193 }
2194
2195 return -ENOENT;
2196 }
2197 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
2198 fc_reset_statistics);
2199
2200 static struct attribute *fc_statistics_attrs[] = {
2201 &device_attr_host_seconds_since_last_reset.attr,
2202 &device_attr_host_tx_frames.attr,
2203 &device_attr_host_tx_words.attr,
2204 &device_attr_host_rx_frames.attr,
2205 &device_attr_host_rx_words.attr,
2206 &device_attr_host_lip_count.attr,
2207 &device_attr_host_nos_count.attr,
2208 &device_attr_host_error_frames.attr,
2209 &device_attr_host_dumped_frames.attr,
2210 &device_attr_host_link_failure_count.attr,
2211 &device_attr_host_loss_of_sync_count.attr,
2212 &device_attr_host_loss_of_signal_count.attr,
2213 &device_attr_host_prim_seq_protocol_err_count.attr,
2214 &device_attr_host_invalid_tx_word_count.attr,
2215 &device_attr_host_invalid_crc_count.attr,
2216 &device_attr_host_fcp_input_requests.attr,
2217 &device_attr_host_fcp_output_requests.attr,
2218 &device_attr_host_fcp_control_requests.attr,
2219 &device_attr_host_fcp_input_megabytes.attr,
2220 &device_attr_host_fcp_output_megabytes.attr,
2221 &device_attr_host_fcp_packet_alloc_failures.attr,
2222 &device_attr_host_fcp_packet_aborts.attr,
2223 &device_attr_host_fcp_frame_alloc_failures.attr,
2224 &device_attr_host_fc_no_free_exch.attr,
2225 &device_attr_host_fc_no_free_exch_xid.attr,
2226 &device_attr_host_fc_xid_not_found.attr,
2227 &device_attr_host_fc_xid_busy.attr,
2228 &device_attr_host_fc_seq_not_found.attr,
2229 &device_attr_host_fc_non_bls_resp.attr,
2230 &device_attr_host_cn_sig_warn.attr,
2231 &device_attr_host_cn_sig_alarm.attr,
2232 &device_attr_host_reset_statistics.attr,
2233 &device_attr_host_fpin_dn.attr,
2234 &device_attr_host_fpin_dn_unknown.attr,
2235 &device_attr_host_fpin_dn_timeout.attr,
2236 &device_attr_host_fpin_dn_unable_to_route.attr,
2237 &device_attr_host_fpin_dn_device_specific.attr,
2238 &device_attr_host_fpin_li.attr,
2239 &device_attr_host_fpin_li_failure_unknown.attr,
2240 &device_attr_host_fpin_li_link_failure_count.attr,
2241 &device_attr_host_fpin_li_loss_of_sync_count.attr,
2242 &device_attr_host_fpin_li_loss_of_signals_count.attr,
2243 &device_attr_host_fpin_li_prim_seq_err_count.attr,
2244 &device_attr_host_fpin_li_invalid_tx_word_count.attr,
2245 &device_attr_host_fpin_li_invalid_crc_count.attr,
2246 &device_attr_host_fpin_li_device_specific.attr,
2247 &device_attr_host_fpin_cn.attr,
2248 &device_attr_host_fpin_cn_clear.attr,
2249 &device_attr_host_fpin_cn_lost_credit.attr,
2250 &device_attr_host_fpin_cn_credit_stall.attr,
2251 &device_attr_host_fpin_cn_oversubscription.attr,
2252 &device_attr_host_fpin_cn_device_specific.attr,
2253 NULL
2254 };
2255
2256 static struct attribute_group fc_statistics_group = {
2257 .name = "statistics",
2258 .attrs = fc_statistics_attrs,
2259 };
2260
2261
2262 /* Host Vport Attributes */
2263
2264 static int
fc_parse_wwn(const char * ns,u64 * nm)2265 fc_parse_wwn(const char *ns, u64 *nm)
2266 {
2267 unsigned int i, j;
2268 u8 wwn[8];
2269
2270 memset(wwn, 0, sizeof(wwn));
2271
2272 /* Validate and store the new name */
2273 for (i=0, j=0; i < 16; i++) {
2274 int value;
2275
2276 value = hex_to_bin(*ns++);
2277 if (value >= 0)
2278 j = (j << 4) | value;
2279 else
2280 return -EINVAL;
2281 if (i % 2) {
2282 wwn[i/2] = j & 0xff;
2283 j = 0;
2284 }
2285 }
2286
2287 *nm = wwn_to_u64(wwn);
2288
2289 return 0;
2290 }
2291
2292
2293 /*
2294 * "Short-cut" sysfs variable to create a new vport on a FC Host.
2295 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
2296 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
2297 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
2298 */
2299 static ssize_t
store_fc_host_vport_create(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2300 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
2301 const char *buf, size_t count)
2302 {
2303 struct Scsi_Host *shost = transport_class_to_shost(dev);
2304 struct fc_vport_identifiers vid;
2305 struct fc_vport *vport;
2306 unsigned int cnt=count;
2307 int stat;
2308
2309 memset(&vid, 0, sizeof(vid));
2310
2311 /* count may include a LF at end of string */
2312 if (buf[cnt-1] == '\n')
2313 cnt--;
2314
2315 /* validate we have enough characters for WWPN */
2316 if ((cnt != (16+1+16)) || (buf[16] != ':'))
2317 return -EINVAL;
2318
2319 stat = fc_parse_wwn(&buf[0], &vid.port_name);
2320 if (stat)
2321 return stat;
2322
2323 stat = fc_parse_wwn(&buf[17], &vid.node_name);
2324 if (stat)
2325 return stat;
2326
2327 vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
2328 vid.vport_type = FC_PORTTYPE_NPIV;
2329 /* vid.symbolic_name is already zero/NULL's */
2330 vid.disable = false; /* always enabled */
2331
2332 /* we only allow support on Channel 0 !!! */
2333 stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
2334 return stat ? stat : count;
2335 }
2336 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
2337 store_fc_host_vport_create);
2338
2339
2340 /*
2341 * "Short-cut" sysfs variable to delete a vport on a FC Host.
2342 * Vport is identified by a string containing "<WWPN>:<WWNN>".
2343 * The WWNs are specified as hex characters, and may *not* contain
2344 * any prefixes (e.g. 0x, x, etc)
2345 */
2346 static ssize_t
store_fc_host_vport_delete(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2347 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
2348 const char *buf, size_t count)
2349 {
2350 struct Scsi_Host *shost = transport_class_to_shost(dev);
2351 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2352 struct fc_vport *vport;
2353 u64 wwpn, wwnn;
2354 unsigned long flags;
2355 unsigned int cnt=count;
2356 int stat, match;
2357
2358 /* count may include a LF at end of string */
2359 if (buf[cnt-1] == '\n')
2360 cnt--;
2361
2362 /* validate we have enough characters for WWPN */
2363 if ((cnt != (16+1+16)) || (buf[16] != ':'))
2364 return -EINVAL;
2365
2366 stat = fc_parse_wwn(&buf[0], &wwpn);
2367 if (stat)
2368 return stat;
2369
2370 stat = fc_parse_wwn(&buf[17], &wwnn);
2371 if (stat)
2372 return stat;
2373
2374 spin_lock_irqsave(shost->host_lock, flags);
2375 match = 0;
2376 /* we only allow support on Channel 0 !!! */
2377 list_for_each_entry(vport, &fc_host->vports, peers) {
2378 if ((vport->channel == 0) &&
2379 (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
2380 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
2381 break;
2382 vport->flags |= FC_VPORT_DELETING;
2383 match = 1;
2384 break;
2385 }
2386 }
2387 spin_unlock_irqrestore(shost->host_lock, flags);
2388
2389 if (!match)
2390 return -ENODEV;
2391
2392 stat = fc_vport_terminate(vport);
2393 return stat ? stat : count;
2394 }
2395 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
2396 store_fc_host_vport_delete);
2397
2398
fc_host_match(struct attribute_container * cont,struct device * dev)2399 static int fc_host_match(struct attribute_container *cont,
2400 struct device *dev)
2401 {
2402 struct Scsi_Host *shost;
2403 struct fc_internal *i;
2404
2405 if (!scsi_is_host_device(dev))
2406 return 0;
2407
2408 shost = dev_to_shost(dev);
2409 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2410 != &fc_host_class.class)
2411 return 0;
2412
2413 i = to_fc_internal(shost->transportt);
2414
2415 return &i->t.host_attrs.ac == cont;
2416 }
2417
fc_target_match(struct attribute_container * cont,struct device * dev)2418 static int fc_target_match(struct attribute_container *cont,
2419 struct device *dev)
2420 {
2421 struct Scsi_Host *shost;
2422 struct fc_internal *i;
2423
2424 if (!scsi_is_target_device(dev))
2425 return 0;
2426
2427 shost = dev_to_shost(dev->parent);
2428 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2429 != &fc_host_class.class)
2430 return 0;
2431
2432 i = to_fc_internal(shost->transportt);
2433
2434 return &i->t.target_attrs.ac == cont;
2435 }
2436
fc_rport_dev_release(struct device * dev)2437 static void fc_rport_dev_release(struct device *dev)
2438 {
2439 struct fc_rport *rport = dev_to_rport(dev);
2440 put_device(dev->parent);
2441 kfree(rport);
2442 }
2443
scsi_is_fc_rport(const struct device * dev)2444 int scsi_is_fc_rport(const struct device *dev)
2445 {
2446 return dev->release == fc_rport_dev_release;
2447 }
2448 EXPORT_SYMBOL(scsi_is_fc_rport);
2449
fc_rport_match(struct attribute_container * cont,struct device * dev)2450 static int fc_rport_match(struct attribute_container *cont,
2451 struct device *dev)
2452 {
2453 struct Scsi_Host *shost;
2454 struct fc_internal *i;
2455
2456 if (!scsi_is_fc_rport(dev))
2457 return 0;
2458
2459 shost = dev_to_shost(dev->parent);
2460 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2461 != &fc_host_class.class)
2462 return 0;
2463
2464 i = to_fc_internal(shost->transportt);
2465
2466 return &i->rport_attr_cont.ac == cont;
2467 }
2468
2469
fc_vport_dev_release(struct device * dev)2470 static void fc_vport_dev_release(struct device *dev)
2471 {
2472 struct fc_vport *vport = dev_to_vport(dev);
2473 put_device(dev->parent); /* release kobj parent */
2474 kfree(vport);
2475 }
2476
scsi_is_fc_vport(const struct device * dev)2477 static int scsi_is_fc_vport(const struct device *dev)
2478 {
2479 return dev->release == fc_vport_dev_release;
2480 }
2481
fc_vport_match(struct attribute_container * cont,struct device * dev)2482 static int fc_vport_match(struct attribute_container *cont,
2483 struct device *dev)
2484 {
2485 struct fc_vport *vport;
2486 struct Scsi_Host *shost;
2487 struct fc_internal *i;
2488
2489 if (!scsi_is_fc_vport(dev))
2490 return 0;
2491 vport = dev_to_vport(dev);
2492
2493 shost = vport_to_shost(vport);
2494 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2495 != &fc_host_class.class)
2496 return 0;
2497
2498 i = to_fc_internal(shost->transportt);
2499 return &i->vport_attr_cont.ac == cont;
2500 }
2501
2502
2503 /**
2504 * fc_eh_timed_out - FC Transport I/O timeout intercept handler
2505 * @scmd: The SCSI command which timed out
2506 *
2507 * This routine protects against error handlers getting invoked while a
2508 * rport is in a blocked state, typically due to a temporarily loss of
2509 * connectivity. If the error handlers are allowed to proceed, requests
2510 * to abort i/o, reset the target, etc will likely fail as there is no way
2511 * to communicate with the device to perform the requested function. These
2512 * failures may result in the midlayer taking the device offline, requiring
2513 * manual intervention to restore operation.
2514 *
2515 * This routine, called whenever an i/o times out, validates the state of
2516 * the underlying rport. If the rport is blocked, it returns
2517 * EH_RESET_TIMER, which will continue to reschedule the timeout.
2518 * Eventually, either the device will return, or devloss_tmo will fire,
2519 * and when the timeout then fires, it will be handled normally.
2520 * If the rport is not blocked, normal error handling continues.
2521 *
2522 * Notes:
2523 * This routine assumes no locks are held on entry.
2524 */
fc_eh_timed_out(struct scsi_cmnd * scmd)2525 enum scsi_timeout_action fc_eh_timed_out(struct scsi_cmnd *scmd)
2526 {
2527 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2528
2529 if (rport->port_state == FC_PORTSTATE_BLOCKED)
2530 return SCSI_EH_RESET_TIMER;
2531
2532 return SCSI_EH_NOT_HANDLED;
2533 }
2534 EXPORT_SYMBOL(fc_eh_timed_out);
2535
2536 /*
2537 * Called by fc_user_scan to locate an rport on the shost that
2538 * matches the channel and target id, and invoke scsi_scan_target()
2539 * on the rport.
2540 */
2541 static void
fc_user_scan_tgt(struct Scsi_Host * shost,uint channel,uint id,u64 lun)2542 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2543 {
2544 struct fc_rport *rport;
2545 unsigned long flags;
2546
2547 spin_lock_irqsave(shost->host_lock, flags);
2548
2549 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2550 if (rport->scsi_target_id == -1)
2551 continue;
2552
2553 if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
2554 (rport->port_state != FC_PORTSTATE_MARGINAL))
2555 continue;
2556
2557 if ((channel == rport->channel) &&
2558 (id == rport->scsi_target_id)) {
2559 spin_unlock_irqrestore(shost->host_lock, flags);
2560 scsi_scan_target(&rport->dev, channel, id, lun,
2561 SCSI_SCAN_MANUAL);
2562 return;
2563 }
2564 }
2565
2566 spin_unlock_irqrestore(shost->host_lock, flags);
2567 }
2568
2569 /*
2570 * Called via sysfs scan routines. Necessary, as the FC transport
2571 * wants to place all target objects below the rport object. So this
2572 * routine must invoke the scsi_scan_target() routine with the rport
2573 * object as the parent.
2574 */
2575 static int
fc_user_scan(struct Scsi_Host * shost,uint channel,uint id,u64 lun)2576 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2577 {
2578 uint chlo, chhi;
2579 uint tgtlo, tgthi;
2580
2581 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2582 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2583 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2584 return -EINVAL;
2585
2586 if (channel == SCAN_WILD_CARD) {
2587 chlo = 0;
2588 chhi = shost->max_channel + 1;
2589 } else {
2590 chlo = channel;
2591 chhi = channel + 1;
2592 }
2593
2594 if (id == SCAN_WILD_CARD) {
2595 tgtlo = 0;
2596 tgthi = shost->max_id;
2597 } else {
2598 tgtlo = id;
2599 tgthi = id + 1;
2600 }
2601
2602 for ( ; chlo < chhi; chlo++)
2603 for ( ; tgtlo < tgthi; tgtlo++)
2604 fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2605
2606 return 0;
2607 }
2608
2609 struct scsi_transport_template *
fc_attach_transport(struct fc_function_template * ft)2610 fc_attach_transport(struct fc_function_template *ft)
2611 {
2612 int count;
2613 struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2614 GFP_KERNEL);
2615
2616 if (unlikely(!i))
2617 return NULL;
2618
2619 i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2620 i->t.target_attrs.ac.class = &fc_transport_class.class;
2621 i->t.target_attrs.ac.match = fc_target_match;
2622 i->t.target_size = sizeof(struct fc_starget_attrs);
2623 transport_container_register(&i->t.target_attrs);
2624
2625 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2626 i->t.host_attrs.ac.class = &fc_host_class.class;
2627 i->t.host_attrs.ac.match = fc_host_match;
2628 i->t.host_size = sizeof(struct fc_host_attrs);
2629 if (ft->get_fc_host_stats)
2630 i->t.host_attrs.statistics = &fc_statistics_group;
2631 transport_container_register(&i->t.host_attrs);
2632
2633 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2634 i->rport_attr_cont.ac.class = &fc_rport_class.class;
2635 i->rport_attr_cont.ac.match = fc_rport_match;
2636 i->rport_attr_cont.statistics = &fc_rport_statistics_group;
2637 transport_container_register(&i->rport_attr_cont);
2638
2639 i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2640 i->vport_attr_cont.ac.class = &fc_vport_class.class;
2641 i->vport_attr_cont.ac.match = fc_vport_match;
2642 transport_container_register(&i->vport_attr_cont);
2643
2644 i->f = ft;
2645
2646 /* Transport uses the shost workq for scsi scanning */
2647 i->t.create_work_queue = 1;
2648
2649 i->t.user_scan = fc_user_scan;
2650
2651 /*
2652 * Setup SCSI Target Attributes.
2653 */
2654 count = 0;
2655 SETUP_STARGET_ATTRIBUTE_RD(node_name);
2656 SETUP_STARGET_ATTRIBUTE_RD(port_name);
2657 SETUP_STARGET_ATTRIBUTE_RD(port_id);
2658
2659 BUG_ON(count > FC_STARGET_NUM_ATTRS);
2660
2661 i->starget_attrs[count] = NULL;
2662
2663
2664 /*
2665 * Setup SCSI Host Attributes.
2666 */
2667 count=0;
2668 SETUP_HOST_ATTRIBUTE_RD(node_name);
2669 SETUP_HOST_ATTRIBUTE_RD(port_name);
2670 SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2671 SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2672 SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2673 SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2674 SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2675 if (ft->vport_create) {
2676 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2677 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2678 }
2679 SETUP_HOST_ATTRIBUTE_RD(serial_number);
2680 SETUP_HOST_ATTRIBUTE_RD(manufacturer);
2681 SETUP_HOST_ATTRIBUTE_RD(model);
2682 SETUP_HOST_ATTRIBUTE_RD(model_description);
2683 SETUP_HOST_ATTRIBUTE_RD(hardware_version);
2684 SETUP_HOST_ATTRIBUTE_RD(driver_version);
2685 SETUP_HOST_ATTRIBUTE_RD(firmware_version);
2686 SETUP_HOST_ATTRIBUTE_RD(optionrom_version);
2687
2688 SETUP_HOST_ATTRIBUTE_RD(port_id);
2689 SETUP_HOST_ATTRIBUTE_RD(port_type);
2690 SETUP_HOST_ATTRIBUTE_RD(port_state);
2691 SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2692 SETUP_HOST_ATTRIBUTE_RD(speed);
2693 SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2694 SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2695 SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2696
2697 /* Transport-managed attributes */
2698 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2699 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2700 if (ft->issue_fc_host_lip)
2701 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2702 if (ft->vport_create)
2703 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2704 if (ft->vport_delete)
2705 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2706
2707 BUG_ON(count > FC_HOST_NUM_ATTRS);
2708
2709 i->host_attrs[count] = NULL;
2710
2711 /*
2712 * Setup Remote Port Attributes.
2713 */
2714 count=0;
2715 SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2716 SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2717 SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2718 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2719 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2720 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2721 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2722 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(port_state);
2723 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2724 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2725
2726 BUG_ON(count > FC_RPORT_NUM_ATTRS);
2727
2728 i->rport_attrs[count] = NULL;
2729
2730 /*
2731 * Setup Virtual Port Attributes.
2732 */
2733 count=0;
2734 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2735 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2736 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2737 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2738 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2739 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2740 SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2741 SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2742 SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2743
2744 BUG_ON(count > FC_VPORT_NUM_ATTRS);
2745
2746 i->vport_attrs[count] = NULL;
2747
2748 return &i->t;
2749 }
2750 EXPORT_SYMBOL(fc_attach_transport);
2751
fc_release_transport(struct scsi_transport_template * t)2752 void fc_release_transport(struct scsi_transport_template *t)
2753 {
2754 struct fc_internal *i = to_fc_internal(t);
2755
2756 transport_container_unregister(&i->t.target_attrs);
2757 transport_container_unregister(&i->t.host_attrs);
2758 transport_container_unregister(&i->rport_attr_cont);
2759 transport_container_unregister(&i->vport_attr_cont);
2760
2761 kfree(i);
2762 }
2763 EXPORT_SYMBOL(fc_release_transport);
2764
2765 /**
2766 * fc_queue_work - Queue work to the fc_host workqueue.
2767 * @shost: Pointer to Scsi_Host bound to fc_host.
2768 * @work: Work to queue for execution.
2769 *
2770 * Return value:
2771 * 1 - work queued for execution
2772 * 0 - work is already queued
2773 * -EINVAL - work queue doesn't exist
2774 */
2775 static int
fc_queue_work(struct Scsi_Host * shost,struct work_struct * work)2776 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2777 {
2778 if (unlikely(!fc_host_work_q(shost))) {
2779 printk(KERN_ERR
2780 "ERROR: FC host '%s' attempted to queue work, "
2781 "when no workqueue created.\n", shost->hostt->name);
2782 dump_stack();
2783
2784 return -EINVAL;
2785 }
2786
2787 return queue_work(fc_host_work_q(shost), work);
2788 }
2789
2790 /**
2791 * fc_flush_work - Flush a fc_host's workqueue.
2792 * @shost: Pointer to Scsi_Host bound to fc_host.
2793 */
2794 static void
fc_flush_work(struct Scsi_Host * shost)2795 fc_flush_work(struct Scsi_Host *shost)
2796 {
2797 if (!fc_host_work_q(shost)) {
2798 printk(KERN_ERR
2799 "ERROR: FC host '%s' attempted to flush work, "
2800 "when no workqueue created.\n", shost->hostt->name);
2801 dump_stack();
2802 return;
2803 }
2804
2805 flush_workqueue(fc_host_work_q(shost));
2806 }
2807
2808 /**
2809 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2810 * @shost: Pointer to Scsi_Host bound to fc_host.
2811 * @rport: rport associated with the devloss work
2812 * @work: Work to queue for execution.
2813 * @delay: jiffies to delay the work queuing
2814 *
2815 * Return value:
2816 * 1 on success / 0 already queued / < 0 for error
2817 */
2818 static int
fc_queue_devloss_work(struct Scsi_Host * shost,struct fc_rport * rport,struct delayed_work * work,unsigned long delay)2819 fc_queue_devloss_work(struct Scsi_Host *shost, struct fc_rport *rport,
2820 struct delayed_work *work, unsigned long delay)
2821 {
2822 if (unlikely(!rport->devloss_work_q)) {
2823 printk(KERN_ERR
2824 "ERROR: FC host '%s' attempted to queue work, "
2825 "when no workqueue created.\n", shost->hostt->name);
2826 dump_stack();
2827
2828 return -EINVAL;
2829 }
2830
2831 return queue_delayed_work(rport->devloss_work_q, work, delay);
2832 }
2833
2834 /**
2835 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2836 * @shost: Pointer to Scsi_Host bound to fc_host.
2837 * @rport: rport associated with the devloss work
2838 */
2839 static void
fc_flush_devloss(struct Scsi_Host * shost,struct fc_rport * rport)2840 fc_flush_devloss(struct Scsi_Host *shost, struct fc_rport *rport)
2841 {
2842 if (unlikely(!rport->devloss_work_q)) {
2843 printk(KERN_ERR
2844 "ERROR: FC host '%s' attempted to flush work, "
2845 "when no workqueue created.\n", shost->hostt->name);
2846 dump_stack();
2847 return;
2848 }
2849
2850 flush_workqueue(rport->devloss_work_q);
2851 }
2852
2853
2854 /**
2855 * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2856 * @shost: Which &Scsi_Host
2857 *
2858 * This routine is expected to be called immediately preceding the
2859 * a driver's call to scsi_remove_host().
2860 *
2861 * WARNING: A driver utilizing the fc_transport, which fails to call
2862 * this routine prior to scsi_remove_host(), will leave dangling
2863 * objects in /sys/class/fc_remote_ports. Access to any of these
2864 * objects can result in a system crash !!!
2865 *
2866 * Notes:
2867 * This routine assumes no locks are held on entry.
2868 */
2869 void
fc_remove_host(struct Scsi_Host * shost)2870 fc_remove_host(struct Scsi_Host *shost)
2871 {
2872 struct fc_vport *vport = NULL, *next_vport = NULL;
2873 struct fc_rport *rport = NULL, *next_rport = NULL;
2874 struct workqueue_struct *work_q;
2875 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2876 unsigned long flags;
2877
2878 spin_lock_irqsave(shost->host_lock, flags);
2879
2880 /* Remove any vports */
2881 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2882 vport->flags |= FC_VPORT_DELETING;
2883 fc_queue_work(shost, &vport->vport_delete_work);
2884 }
2885
2886 /* Remove any remote ports */
2887 list_for_each_entry_safe(rport, next_rport,
2888 &fc_host->rports, peers) {
2889 list_del(&rport->peers);
2890 rport->port_state = FC_PORTSTATE_DELETED;
2891 fc_queue_work(shost, &rport->rport_delete_work);
2892 }
2893
2894 list_for_each_entry_safe(rport, next_rport,
2895 &fc_host->rport_bindings, peers) {
2896 list_del(&rport->peers);
2897 rport->port_state = FC_PORTSTATE_DELETED;
2898 fc_queue_work(shost, &rport->rport_delete_work);
2899 }
2900
2901 spin_unlock_irqrestore(shost->host_lock, flags);
2902
2903 /* flush all scan work items */
2904 scsi_flush_work(shost);
2905
2906 /* flush all stgt delete, and rport delete work items, then kill it */
2907 if (fc_host->work_q) {
2908 work_q = fc_host->work_q;
2909 fc_host->work_q = NULL;
2910 destroy_workqueue(work_q);
2911 }
2912 }
2913 EXPORT_SYMBOL(fc_remove_host);
2914
fc_terminate_rport_io(struct fc_rport * rport)2915 static void fc_terminate_rport_io(struct fc_rport *rport)
2916 {
2917 struct Scsi_Host *shost = rport_to_shost(rport);
2918 struct fc_internal *i = to_fc_internal(shost->transportt);
2919
2920 /* Involve the LLDD if possible to terminate all io on the rport. */
2921 if (i->f->terminate_rport_io)
2922 i->f->terminate_rport_io(rport);
2923
2924 /*
2925 * Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
2926 */
2927 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
2928 }
2929
2930 /**
2931 * fc_starget_delete - called to delete the scsi descendants of an rport
2932 * @work: remote port to be operated on.
2933 *
2934 * Deletes target and all sdevs.
2935 */
2936 static void
fc_starget_delete(struct work_struct * work)2937 fc_starget_delete(struct work_struct *work)
2938 {
2939 struct fc_rport *rport =
2940 container_of(work, struct fc_rport, stgt_delete_work);
2941
2942 fc_terminate_rport_io(rport);
2943 scsi_remove_target(&rport->dev);
2944 }
2945
2946
2947 /**
2948 * fc_rport_final_delete - finish rport termination and delete it.
2949 * @work: remote port to be deleted.
2950 */
2951 static void
fc_rport_final_delete(struct work_struct * work)2952 fc_rport_final_delete(struct work_struct *work)
2953 {
2954 struct fc_rport *rport =
2955 container_of(work, struct fc_rport, rport_delete_work);
2956 struct device *dev = &rport->dev;
2957 struct Scsi_Host *shost = rport_to_shost(rport);
2958 struct fc_internal *i = to_fc_internal(shost->transportt);
2959 struct workqueue_struct *work_q;
2960 unsigned long flags;
2961 int do_callback = 0;
2962
2963 fc_terminate_rport_io(rport);
2964
2965 /*
2966 * if a scan is pending, flush the SCSI Host work_q so that
2967 * that we can reclaim the rport scan work element.
2968 */
2969 if (rport->flags & FC_RPORT_SCAN_PENDING)
2970 scsi_flush_work(shost);
2971
2972 /*
2973 * Cancel any outstanding timers. These should really exist
2974 * only when rmmod'ing the LLDD and we're asking for
2975 * immediate termination of the rports
2976 */
2977 spin_lock_irqsave(shost->host_lock, flags);
2978 if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2979 spin_unlock_irqrestore(shost->host_lock, flags);
2980 if (!cancel_delayed_work(&rport->fail_io_work))
2981 fc_flush_devloss(shost, rport);
2982 if (!cancel_delayed_work(&rport->dev_loss_work))
2983 fc_flush_devloss(shost, rport);
2984 cancel_work_sync(&rport->scan_work);
2985 spin_lock_irqsave(shost->host_lock, flags);
2986 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2987 }
2988 spin_unlock_irqrestore(shost->host_lock, flags);
2989
2990 /* Delete SCSI target and sdevs */
2991 if (rport->scsi_target_id != -1)
2992 fc_starget_delete(&rport->stgt_delete_work);
2993
2994 /*
2995 * Notify the driver that the rport is now dead. The LLDD will
2996 * also guarantee that any communication to the rport is terminated
2997 *
2998 * Avoid this call if we already called it when we preserved the
2999 * rport for the binding.
3000 */
3001 spin_lock_irqsave(shost->host_lock, flags);
3002 if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
3003 (i->f->dev_loss_tmo_callbk)) {
3004 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3005 do_callback = 1;
3006 }
3007 spin_unlock_irqrestore(shost->host_lock, flags);
3008
3009 if (do_callback)
3010 i->f->dev_loss_tmo_callbk(rport);
3011
3012 fc_bsg_remove(rport->rqst_q);
3013
3014 if (rport->devloss_work_q) {
3015 work_q = rport->devloss_work_q;
3016 rport->devloss_work_q = NULL;
3017 destroy_workqueue(work_q);
3018 }
3019
3020 transport_remove_device(dev);
3021 device_del(dev);
3022 transport_destroy_device(dev);
3023 scsi_host_put(shost); /* for fc_host->rport list */
3024 put_device(dev); /* for self-reference */
3025 }
3026
3027
3028 /**
3029 * fc_remote_port_create - allocates and creates a remote FC port.
3030 * @shost: scsi host the remote port is connected to.
3031 * @channel: Channel on shost port connected to.
3032 * @ids: The world wide names, fc address, and FC4 port
3033 * roles for the remote port.
3034 *
3035 * Allocates and creates the remoter port structure, including the
3036 * class and sysfs creation.
3037 *
3038 * Notes:
3039 * This routine assumes no locks are held on entry.
3040 */
3041 static struct fc_rport *
fc_remote_port_create(struct Scsi_Host * shost,int channel,struct fc_rport_identifiers * ids)3042 fc_remote_port_create(struct Scsi_Host *shost, int channel,
3043 struct fc_rport_identifiers *ids)
3044 {
3045 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3046 struct fc_internal *fci = to_fc_internal(shost->transportt);
3047 struct fc_rport *rport;
3048 struct device *dev;
3049 unsigned long flags;
3050 int error;
3051 size_t size;
3052
3053 size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
3054 rport = kzalloc(size, GFP_KERNEL);
3055 if (unlikely(!rport)) {
3056 printk(KERN_ERR "%s: allocation failure\n", __func__);
3057 return NULL;
3058 }
3059
3060 rport->maxframe_size = -1;
3061 rport->supported_classes = FC_COS_UNSPECIFIED;
3062 rport->dev_loss_tmo = fc_host->dev_loss_tmo;
3063 memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
3064 memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
3065 rport->port_id = ids->port_id;
3066 rport->roles = ids->roles;
3067 rport->port_state = FC_PORTSTATE_ONLINE;
3068 if (fci->f->dd_fcrport_size)
3069 rport->dd_data = &rport[1];
3070 rport->channel = channel;
3071 rport->fast_io_fail_tmo = -1;
3072
3073 INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
3074 INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
3075 INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
3076 INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
3077 INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
3078
3079 spin_lock_irqsave(shost->host_lock, flags);
3080
3081 rport->number = fc_host->next_rport_number++;
3082 if ((rport->roles & FC_PORT_ROLE_FCP_TARGET) ||
3083 (rport->roles & FC_PORT_ROLE_FCP_DUMMY_INITIATOR))
3084 rport->scsi_target_id = fc_host->next_target_id++;
3085 else
3086 rport->scsi_target_id = -1;
3087 list_add_tail(&rport->peers, &fc_host->rports);
3088 scsi_host_get(shost); /* for fc_host->rport list */
3089
3090 spin_unlock_irqrestore(shost->host_lock, flags);
3091
3092 rport->devloss_work_q = alloc_workqueue("fc_dl_%d_%d", WQ_PERCPU, 0,
3093 shost->host_no, rport->number);
3094 if (!rport->devloss_work_q) {
3095 printk(KERN_ERR "FC Remote Port alloc_workqueue failed\n");
3096 /*
3097 * Note that we have not yet called device_initialize() / get_device()
3098 * Cannot reclaim incremented rport->number because we released host_lock
3099 */
3100 spin_lock_irqsave(shost->host_lock, flags);
3101 list_del(&rport->peers);
3102 scsi_host_put(shost); /* for fc_host->rport list */
3103 spin_unlock_irqrestore(shost->host_lock, flags);
3104 kfree(rport);
3105 return NULL;
3106 }
3107
3108 dev = &rport->dev;
3109 device_initialize(dev); /* takes self reference */
3110 dev->parent = get_device(&shost->shost_gendev); /* parent reference */
3111 dev->release = fc_rport_dev_release;
3112 dev_set_name(dev, "rport-%d:%d-%d",
3113 shost->host_no, channel, rport->number);
3114 transport_setup_device(dev);
3115
3116 error = device_add(dev);
3117 if (error) {
3118 printk(KERN_ERR "FC Remote Port device_add failed\n");
3119 goto delete_rport;
3120 }
3121 transport_add_device(dev);
3122 transport_configure_device(dev);
3123
3124 fc_bsg_rportadd(shost, rport);
3125 /* ignore any bsg add error - we just can't do sgio */
3126
3127 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
3128 /* initiate a scan of the target */
3129 rport->flags |= FC_RPORT_SCAN_PENDING;
3130 scsi_queue_work(shost, &rport->scan_work);
3131 }
3132
3133 return rport;
3134
3135 delete_rport:
3136 transport_destroy_device(dev);
3137 spin_lock_irqsave(shost->host_lock, flags);
3138 list_del(&rport->peers);
3139 scsi_host_put(shost); /* for fc_host->rport list */
3140 spin_unlock_irqrestore(shost->host_lock, flags);
3141 put_device(dev->parent);
3142 kfree(rport);
3143 return NULL;
3144 }
3145
3146 /**
3147 * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
3148 * @shost: scsi host the remote port is connected to.
3149 * @channel: Channel on shost port connected to.
3150 * @ids: The world wide names, fc address, and FC4 port
3151 * roles for the remote port.
3152 *
3153 * The LLDD calls this routine to notify the transport of the existence
3154 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
3155 * of the port, it's FC address (port_id), and the FC4 roles that are
3156 * active for the port.
3157 *
3158 * For ports that are FCP targets (aka scsi targets), the FC transport
3159 * maintains consistent target id bindings on behalf of the LLDD.
3160 * A consistent target id binding is an assignment of a target id to
3161 * a remote port identifier, which persists while the scsi host is
3162 * attached. The remote port can disappear, then later reappear, and
3163 * it's target id assignment remains the same. This allows for shifts
3164 * in FC addressing (if binding by wwpn or wwnn) with no apparent
3165 * changes to the scsi subsystem which is based on scsi host number and
3166 * target id values. Bindings are only valid during the attachment of
3167 * the scsi host. If the host detaches, then later re-attaches, target
3168 * id bindings may change.
3169 *
3170 * This routine is responsible for returning a remote port structure.
3171 * The routine will search the list of remote ports it maintains
3172 * internally on behalf of consistent target id mappings. If found, the
3173 * remote port structure will be reused. Otherwise, a new remote port
3174 * structure will be allocated.
3175 *
3176 * Whenever a remote port is allocated, a new fc_remote_port class
3177 * device is created.
3178 *
3179 * Should not be called from interrupt context.
3180 *
3181 * Notes:
3182 * This routine assumes no locks are held on entry.
3183 */
3184 struct fc_rport *
fc_remote_port_add(struct Scsi_Host * shost,int channel,struct fc_rport_identifiers * ids)3185 fc_remote_port_add(struct Scsi_Host *shost, int channel,
3186 struct fc_rport_identifiers *ids)
3187 {
3188 struct fc_internal *fci = to_fc_internal(shost->transportt);
3189 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3190 struct fc_rport *rport;
3191 unsigned long flags;
3192 int match = 0;
3193
3194 /* ensure any stgt delete functions are done */
3195 fc_flush_work(shost);
3196
3197 /*
3198 * Search the list of "active" rports, for an rport that has been
3199 * deleted, but we've held off the real delete while the target
3200 * is in a "blocked" state.
3201 */
3202 spin_lock_irqsave(shost->host_lock, flags);
3203
3204 list_for_each_entry(rport, &fc_host->rports, peers) {
3205
3206 if ((rport->port_state == FC_PORTSTATE_BLOCKED ||
3207 rport->port_state == FC_PORTSTATE_NOTPRESENT) &&
3208 (rport->channel == channel)) {
3209
3210 switch (fc_host->tgtid_bind_type) {
3211 case FC_TGTID_BIND_BY_WWPN:
3212 case FC_TGTID_BIND_NONE:
3213 if (rport->port_name == ids->port_name)
3214 match = 1;
3215 break;
3216 case FC_TGTID_BIND_BY_WWNN:
3217 if (rport->node_name == ids->node_name)
3218 match = 1;
3219 break;
3220 case FC_TGTID_BIND_BY_ID:
3221 if (rport->port_id == ids->port_id)
3222 match = 1;
3223 break;
3224 }
3225
3226 if (match) {
3227
3228 memcpy(&rport->node_name, &ids->node_name,
3229 sizeof(rport->node_name));
3230 memcpy(&rport->port_name, &ids->port_name,
3231 sizeof(rport->port_name));
3232 rport->port_id = ids->port_id;
3233
3234 rport->port_state = FC_PORTSTATE_ONLINE;
3235 rport->roles = ids->roles;
3236
3237 spin_unlock_irqrestore(shost->host_lock, flags);
3238
3239 if (fci->f->dd_fcrport_size)
3240 memset(rport->dd_data, 0,
3241 fci->f->dd_fcrport_size);
3242
3243 /*
3244 * If we were not a target, cancel the
3245 * io terminate and rport timers, and
3246 * we're done.
3247 *
3248 * If we were a target, but our new role
3249 * doesn't indicate a target, leave the
3250 * timers running expecting the role to
3251 * change as the target fully logs in. If
3252 * it doesn't, the target will be torn down.
3253 *
3254 * If we were a target, and our role shows
3255 * we're still a target, cancel the timers
3256 * and kick off a scan.
3257 */
3258
3259 /* was a target, not in roles */
3260 if ((rport->scsi_target_id != -1) &&
3261 (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
3262 return rport;
3263
3264 /*
3265 * Stop the fail io and dev_loss timers.
3266 * If they flush, the port_state will
3267 * be checked and will NOOP the function.
3268 */
3269 if (!cancel_delayed_work(&rport->fail_io_work))
3270 fc_flush_devloss(shost, rport);
3271 if (!cancel_delayed_work(&rport->dev_loss_work))
3272 fc_flush_devloss(shost, rport);
3273
3274 spin_lock_irqsave(shost->host_lock, flags);
3275
3276 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3277 FC_RPORT_DEVLOSS_PENDING |
3278 FC_RPORT_DEVLOSS_CALLBK_DONE);
3279
3280 spin_unlock_irqrestore(shost->host_lock, flags);
3281
3282 /* if target, initiate a scan */
3283 if (rport->scsi_target_id != -1) {
3284 scsi_target_unblock(&rport->dev,
3285 SDEV_RUNNING);
3286 spin_lock_irqsave(shost->host_lock,
3287 flags);
3288 rport->flags |= FC_RPORT_SCAN_PENDING;
3289 scsi_queue_work(shost,
3290 &rport->scan_work);
3291 spin_unlock_irqrestore(shost->host_lock,
3292 flags);
3293 }
3294
3295 fc_bsg_goose_queue(rport);
3296
3297 return rport;
3298 }
3299 }
3300 }
3301
3302 /*
3303 * Search the bindings array
3304 * Note: if never a FCP target, you won't be on this list
3305 */
3306 if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
3307
3308 /* search for a matching consistent binding */
3309
3310 list_for_each_entry(rport, &fc_host->rport_bindings,
3311 peers) {
3312 if (rport->channel != channel)
3313 continue;
3314
3315 switch (fc_host->tgtid_bind_type) {
3316 case FC_TGTID_BIND_BY_WWPN:
3317 if (rport->port_name == ids->port_name)
3318 match = 1;
3319 break;
3320 case FC_TGTID_BIND_BY_WWNN:
3321 if (rport->node_name == ids->node_name)
3322 match = 1;
3323 break;
3324 case FC_TGTID_BIND_BY_ID:
3325 if (rport->port_id == ids->port_id)
3326 match = 1;
3327 break;
3328 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3329 break;
3330 }
3331
3332 if (match) {
3333 list_move_tail(&rport->peers, &fc_host->rports);
3334 break;
3335 }
3336 }
3337
3338 if (match) {
3339 memcpy(&rport->node_name, &ids->node_name,
3340 sizeof(rport->node_name));
3341 memcpy(&rport->port_name, &ids->port_name,
3342 sizeof(rport->port_name));
3343 rport->port_id = ids->port_id;
3344 rport->port_state = FC_PORTSTATE_ONLINE;
3345 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3346
3347 if (fci->f->dd_fcrport_size)
3348 memset(rport->dd_data, 0,
3349 fci->f->dd_fcrport_size);
3350 spin_unlock_irqrestore(shost->host_lock, flags);
3351
3352 fc_remote_port_rolechg(rport, ids->roles);
3353 return rport;
3354 }
3355 }
3356
3357 spin_unlock_irqrestore(shost->host_lock, flags);
3358
3359 /* No consistent binding found - create new remote port entry */
3360 rport = fc_remote_port_create(shost, channel, ids);
3361
3362 return rport;
3363 }
3364 EXPORT_SYMBOL(fc_remote_port_add);
3365
3366
3367 /**
3368 * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
3369 * @rport: The remote port that no longer exists
3370 *
3371 * The LLDD calls this routine to notify the transport that a remote
3372 * port is no longer part of the topology. Note: Although a port
3373 * may no longer be part of the topology, it may persist in the remote
3374 * ports displayed by the fc_host. We do this under 2 conditions:
3375 *
3376 * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
3377 * This allows the port to temporarily disappear, then reappear without
3378 * disrupting the SCSI device tree attached to it. During the "blocked"
3379 * period the port will still exist.
3380 *
3381 * 2) If the port was a scsi target and disappears for longer than we
3382 * expect, we'll delete the port and the tear down the SCSI device tree
3383 * attached to it. However, we want to semi-persist the target id assigned
3384 * to that port if it eventually does exist. The port structure will
3385 * remain (although with minimal information) so that the target id
3386 * bindings also remain.
3387 *
3388 * If the remote port is not an FCP Target, it will be fully torn down
3389 * and deallocated, including the fc_remote_port class device.
3390 *
3391 * If the remote port is an FCP Target, the port will be placed in a
3392 * temporary blocked state. From the LLDD's perspective, the rport no
3393 * longer exists. From the SCSI midlayer's perspective, the SCSI target
3394 * exists, but all sdevs on it are blocked from further I/O. The following
3395 * is then expected.
3396 *
3397 * If the remote port does not return (signaled by a LLDD call to
3398 * fc_remote_port_add()) within the dev_loss_tmo timeout, then the
3399 * scsi target is removed - killing all outstanding i/o and removing the
3400 * scsi devices attached to it. The port structure will be marked Not
3401 * Present and be partially cleared, leaving only enough information to
3402 * recognize the remote port relative to the scsi target id binding if
3403 * it later appears. The port will remain as long as there is a valid
3404 * binding (e.g. until the user changes the binding type or unloads the
3405 * scsi host with the binding).
3406 *
3407 * If the remote port returns within the dev_loss_tmo value (and matches
3408 * according to the target id binding type), the port structure will be
3409 * reused. If it is no longer a SCSI target, the target will be torn
3410 * down. If it continues to be a SCSI target, then the target will be
3411 * unblocked (allowing i/o to be resumed), and a scan will be activated
3412 * to ensure that all luns are detected.
3413 *
3414 * Called from normal process context only - cannot be called from interrupt.
3415 *
3416 * Notes:
3417 * This routine assumes no locks are held on entry.
3418 */
3419 void
fc_remote_port_delete(struct fc_rport * rport)3420 fc_remote_port_delete(struct fc_rport *rport)
3421 {
3422 struct Scsi_Host *shost = rport_to_shost(rport);
3423 unsigned long timeout = rport->dev_loss_tmo;
3424 unsigned long flags;
3425
3426 /*
3427 * No need to flush the fc_host work_q's, as all adds are synchronous.
3428 *
3429 * We do need to reclaim the rport scan work element, so eventually
3430 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
3431 * there's still a scan pending.
3432 */
3433
3434 spin_lock_irqsave(shost->host_lock, flags);
3435
3436 if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
3437 (rport->port_state != FC_PORTSTATE_MARGINAL)) {
3438 spin_unlock_irqrestore(shost->host_lock, flags);
3439 return;
3440 }
3441
3442 /*
3443 * In the past, we if this was not an FCP-Target, we would
3444 * unconditionally just jump to deleting the rport.
3445 * However, rports can be used as node containers by the LLDD,
3446 * and its not appropriate to just terminate the rport at the
3447 * first sign of a loss in connectivity. The LLDD may want to
3448 * send ELS traffic to re-validate the login. If the rport is
3449 * immediately deleted, it makes it inappropriate for a node
3450 * container.
3451 * So... we now unconditionally wait dev_loss_tmo before
3452 * destroying an rport.
3453 */
3454
3455 rport->port_state = FC_PORTSTATE_BLOCKED;
3456
3457 rport->flags |= FC_RPORT_DEVLOSS_PENDING;
3458
3459 spin_unlock_irqrestore(shost->host_lock, flags);
3460
3461 scsi_block_targets(shost, &rport->dev);
3462
3463 /* see if we need to kill io faster than waiting for device loss */
3464 if ((rport->fast_io_fail_tmo != -1) &&
3465 (rport->fast_io_fail_tmo < timeout))
3466 fc_queue_devloss_work(shost, rport, &rport->fail_io_work,
3467 rport->fast_io_fail_tmo * HZ);
3468
3469 /* cap the length the devices can be blocked until they are deleted */
3470 fc_queue_devloss_work(shost, rport, &rport->dev_loss_work,
3471 timeout * HZ);
3472 }
3473 EXPORT_SYMBOL(fc_remote_port_delete);
3474
3475 /**
3476 * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
3477 * @rport: The remote port that changed.
3478 * @roles: New roles for this port.
3479 *
3480 * Description: The LLDD calls this routine to notify the transport that the
3481 * roles on a remote port may have changed. The largest effect of this is
3482 * if a port now becomes a FCP Target, it must be allocated a
3483 * scsi target id. If the port is no longer a FCP target, any
3484 * scsi target id value assigned to it will persist in case the
3485 * role changes back to include FCP Target. No changes in the scsi
3486 * midlayer will be invoked if the role changes (in the expectation
3487 * that the role will be resumed. If it doesn't normal error processing
3488 * will take place).
3489 *
3490 * Should not be called from interrupt context.
3491 *
3492 * Notes:
3493 * This routine assumes no locks are held on entry.
3494 */
3495 void
fc_remote_port_rolechg(struct fc_rport * rport,u32 roles)3496 fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
3497 {
3498 struct Scsi_Host *shost = rport_to_shost(rport);
3499 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3500 unsigned long flags;
3501 int create = 0;
3502
3503 spin_lock_irqsave(shost->host_lock, flags);
3504 if (roles & FC_PORT_ROLE_FCP_TARGET) {
3505 if (rport->scsi_target_id == -1) {
3506 rport->scsi_target_id = fc_host->next_target_id++;
3507 create = 1;
3508 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3509 create = 1;
3510 }
3511
3512 rport->roles = roles;
3513
3514 spin_unlock_irqrestore(shost->host_lock, flags);
3515
3516 if (create) {
3517 /*
3518 * There may have been a delete timer running on the
3519 * port. Ensure that it is cancelled as we now know
3520 * the port is an FCP Target.
3521 * Note: we know the rport exists and is in an online
3522 * state as the LLDD would not have had an rport
3523 * reference to pass us.
3524 *
3525 * Take no action on the timer_delete() failure as the state
3526 * machine state change will validate the
3527 * transaction.
3528 */
3529 if (!cancel_delayed_work(&rport->fail_io_work))
3530 fc_flush_devloss(shost, rport);
3531 if (!cancel_delayed_work(&rport->dev_loss_work))
3532 fc_flush_devloss(shost, rport);
3533
3534 spin_lock_irqsave(shost->host_lock, flags);
3535 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3536 FC_RPORT_DEVLOSS_PENDING |
3537 FC_RPORT_DEVLOSS_CALLBK_DONE);
3538 spin_unlock_irqrestore(shost->host_lock, flags);
3539
3540 /* ensure any stgt delete functions are done */
3541 fc_flush_work(shost);
3542
3543 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
3544 /* initiate a scan of the target */
3545 spin_lock_irqsave(shost->host_lock, flags);
3546 rport->flags |= FC_RPORT_SCAN_PENDING;
3547 scsi_queue_work(shost, &rport->scan_work);
3548 spin_unlock_irqrestore(shost->host_lock, flags);
3549 }
3550 }
3551 EXPORT_SYMBOL(fc_remote_port_rolechg);
3552
3553 /**
3554 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3555 * @work: rport target that failed to reappear in the allotted time.
3556 *
3557 * Description: An attempt to delete a remote port blocks, and if it fails
3558 * to return in the allotted time this gets called.
3559 */
3560 static void
fc_timeout_deleted_rport(struct work_struct * work)3561 fc_timeout_deleted_rport(struct work_struct *work)
3562 {
3563 struct fc_rport *rport =
3564 container_of(work, struct fc_rport, dev_loss_work.work);
3565 struct Scsi_Host *shost = rport_to_shost(rport);
3566 struct fc_internal *i = to_fc_internal(shost->transportt);
3567 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3568 unsigned long flags;
3569 int do_callback = 0;
3570
3571 spin_lock_irqsave(shost->host_lock, flags);
3572
3573 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3574
3575 /*
3576 * If the port is ONLINE, then it came back. If it was a SCSI
3577 * target, validate it still is. If not, tear down the
3578 * scsi_target on it.
3579 */
3580 if (((rport->port_state == FC_PORTSTATE_ONLINE) ||
3581 (rport->port_state == FC_PORTSTATE_MARGINAL)) &&
3582 (rport->scsi_target_id != -1) &&
3583 !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3584 dev_printk(KERN_ERR, &rport->dev,
3585 "blocked FC remote port time out: no longer"
3586 " a FCP target, removing starget\n");
3587 spin_unlock_irqrestore(shost->host_lock, flags);
3588 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
3589 fc_queue_work(shost, &rport->stgt_delete_work);
3590 return;
3591 }
3592
3593 /* NOOP state - we're flushing workq's */
3594 if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3595 spin_unlock_irqrestore(shost->host_lock, flags);
3596 dev_printk(KERN_ERR, &rport->dev,
3597 "blocked FC remote port time out: leaving"
3598 " rport%s alone\n",
3599 (rport->scsi_target_id != -1) ? " and starget" : "");
3600 return;
3601 }
3602
3603 if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3604 (rport->scsi_target_id == -1)) {
3605 list_del(&rport->peers);
3606 rport->port_state = FC_PORTSTATE_DELETED;
3607 dev_printk(KERN_ERR, &rport->dev,
3608 "blocked FC remote port time out: removing"
3609 " rport%s\n",
3610 (rport->scsi_target_id != -1) ? " and starget" : "");
3611 fc_queue_work(shost, &rport->rport_delete_work);
3612 spin_unlock_irqrestore(shost->host_lock, flags);
3613 return;
3614 }
3615
3616 dev_printk(KERN_ERR, &rport->dev,
3617 "blocked FC remote port time out: removing target and "
3618 "saving binding\n");
3619
3620 list_move_tail(&rport->peers, &fc_host->rport_bindings);
3621
3622 /*
3623 * Note: We do not remove or clear the hostdata area. This allows
3624 * host-specific target data to persist along with the
3625 * scsi_target_id. It's up to the host to manage it's hostdata area.
3626 */
3627
3628 /*
3629 * Reinitialize port attributes that may change if the port comes back.
3630 */
3631 rport->maxframe_size = -1;
3632 rport->supported_classes = FC_COS_UNSPECIFIED;
3633 rport->roles = FC_PORT_ROLE_UNKNOWN;
3634 rport->port_state = FC_PORTSTATE_NOTPRESENT;
3635 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3636
3637 /*
3638 * Pre-emptively kill I/O rather than waiting for the work queue
3639 * item to teardown the starget. (FCOE libFC folks prefer this
3640 * and to have the rport_port_id still set when it's done).
3641 */
3642 spin_unlock_irqrestore(shost->host_lock, flags);
3643 fc_terminate_rport_io(rport);
3644
3645 spin_lock_irqsave(shost->host_lock, flags);
3646
3647 if (rport->port_state == FC_PORTSTATE_NOTPRESENT) { /* still missing */
3648
3649 /* remove the identifiers that aren't used in the consisting binding */
3650 switch (fc_host->tgtid_bind_type) {
3651 case FC_TGTID_BIND_BY_WWPN:
3652 rport->node_name = -1;
3653 rport->port_id = -1;
3654 break;
3655 case FC_TGTID_BIND_BY_WWNN:
3656 rport->port_name = -1;
3657 rport->port_id = -1;
3658 break;
3659 case FC_TGTID_BIND_BY_ID:
3660 rport->node_name = -1;
3661 rport->port_name = -1;
3662 break;
3663 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3664 break;
3665 }
3666
3667 /*
3668 * As this only occurs if the remote port (scsi target)
3669 * went away and didn't come back - we'll remove
3670 * all attached scsi devices.
3671 */
3672 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3673 fc_queue_work(shost, &rport->stgt_delete_work);
3674
3675 do_callback = 1;
3676 }
3677
3678 spin_unlock_irqrestore(shost->host_lock, flags);
3679
3680 /*
3681 * Notify the driver that the rport is now dead. The LLDD will
3682 * also guarantee that any communication to the rport is terminated
3683 *
3684 * Note: we set the CALLBK_DONE flag above to correspond
3685 */
3686 if (do_callback && i->f->dev_loss_tmo_callbk)
3687 i->f->dev_loss_tmo_callbk(rport);
3688 }
3689
3690
3691 /**
3692 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3693 * @work: rport to terminate io on.
3694 *
3695 * Notes: Only requests the failure of the io, not that all are flushed
3696 * prior to returning.
3697 */
3698 static void
fc_timeout_fail_rport_io(struct work_struct * work)3699 fc_timeout_fail_rport_io(struct work_struct *work)
3700 {
3701 struct fc_rport *rport =
3702 container_of(work, struct fc_rport, fail_io_work.work);
3703
3704 if (rport->port_state != FC_PORTSTATE_BLOCKED)
3705 return;
3706
3707 rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3708 fc_terminate_rport_io(rport);
3709 }
3710
3711 /**
3712 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3713 * @work: remote port to be scanned.
3714 */
3715 static void
fc_scsi_scan_rport(struct work_struct * work)3716 fc_scsi_scan_rport(struct work_struct *work)
3717 {
3718 struct fc_rport *rport =
3719 container_of(work, struct fc_rport, scan_work);
3720 struct Scsi_Host *shost = rport_to_shost(rport);
3721 struct fc_internal *i = to_fc_internal(shost->transportt);
3722 unsigned long flags;
3723
3724 if (((rport->port_state == FC_PORTSTATE_ONLINE) ||
3725 (rport->port_state == FC_PORTSTATE_MARGINAL)) &&
3726 (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3727 !(i->f->disable_target_scan)) {
3728 scsi_scan_target(&rport->dev, rport->channel,
3729 rport->scsi_target_id, SCAN_WILD_CARD,
3730 SCSI_SCAN_RESCAN);
3731 }
3732
3733 spin_lock_irqsave(shost->host_lock, flags);
3734 rport->flags &= ~FC_RPORT_SCAN_PENDING;
3735 spin_unlock_irqrestore(shost->host_lock, flags);
3736 }
3737
3738 /**
3739 * fc_block_rport() - Block SCSI eh thread for blocked fc_rport.
3740 * @rport: Remote port that scsi_eh is trying to recover.
3741 *
3742 * This routine can be called from a FC LLD scsi_eh callback. It
3743 * blocks the scsi_eh thread until the fc_rport leaves the
3744 * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3745 * necessary to avoid the scsi_eh failing recovery actions for blocked
3746 * rports which would lead to offlined SCSI devices.
3747 *
3748 * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3749 * FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3750 * passed back to scsi_eh.
3751 */
fc_block_rport(struct fc_rport * rport)3752 int fc_block_rport(struct fc_rport *rport)
3753 {
3754 struct Scsi_Host *shost = rport_to_shost(rport);
3755 unsigned long flags;
3756
3757 spin_lock_irqsave(shost->host_lock, flags);
3758 while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3759 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3760 spin_unlock_irqrestore(shost->host_lock, flags);
3761 msleep(1000);
3762 spin_lock_irqsave(shost->host_lock, flags);
3763 }
3764 spin_unlock_irqrestore(shost->host_lock, flags);
3765
3766 if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3767 return FAST_IO_FAIL;
3768
3769 return 0;
3770 }
3771 EXPORT_SYMBOL(fc_block_rport);
3772
3773 /**
3774 * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3775 * @cmnd: SCSI command that scsi_eh is trying to recover
3776 *
3777 * This routine can be called from a FC LLD scsi_eh callback. It
3778 * blocks the scsi_eh thread until the fc_rport leaves the
3779 * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3780 * necessary to avoid the scsi_eh failing recovery actions for blocked
3781 * rports which would lead to offlined SCSI devices.
3782 *
3783 * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3784 * FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3785 * passed back to scsi_eh.
3786 */
fc_block_scsi_eh(struct scsi_cmnd * cmnd)3787 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3788 {
3789 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3790
3791 if (WARN_ON_ONCE(!rport))
3792 return FAST_IO_FAIL;
3793
3794 return fc_block_rport(rport);
3795 }
3796 EXPORT_SYMBOL(fc_block_scsi_eh);
3797
3798 /*
3799 * fc_eh_should_retry_cmd - Checks if the cmd should be retried or not
3800 * @scmd: The SCSI command to be checked
3801 *
3802 * This checks the rport state to decide if a cmd is
3803 * retryable.
3804 *
3805 * Returns: true if the rport state is not in marginal state.
3806 */
fc_eh_should_retry_cmd(struct scsi_cmnd * scmd)3807 bool fc_eh_should_retry_cmd(struct scsi_cmnd *scmd)
3808 {
3809 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
3810
3811 if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
3812 (scsi_cmd_to_rq(scmd)->cmd_flags & REQ_FAILFAST_TRANSPORT)) {
3813 set_host_byte(scmd, DID_TRANSPORT_MARGINAL);
3814 return false;
3815 }
3816 return true;
3817 }
3818 EXPORT_SYMBOL_GPL(fc_eh_should_retry_cmd);
3819
3820 /**
3821 * fc_vport_setup - allocates and creates a FC virtual port.
3822 * @shost: scsi host the virtual port is connected to.
3823 * @channel: Channel on shost port connected to.
3824 * @pdev: parent device for vport
3825 * @ids: The world wide names, FC4 port roles, etc for
3826 * the virtual port.
3827 * @ret_vport: The pointer to the created vport.
3828 *
3829 * Allocates and creates the vport structure, calls the parent host
3830 * to instantiate the vport, this completes w/ class and sysfs creation.
3831 *
3832 * Notes:
3833 * This routine assumes no locks are held on entry.
3834 */
3835 static int
fc_vport_setup(struct Scsi_Host * shost,int channel,struct device * pdev,struct fc_vport_identifiers * ids,struct fc_vport ** ret_vport)3836 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3837 struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
3838 {
3839 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3840 struct fc_internal *fci = to_fc_internal(shost->transportt);
3841 struct fc_vport *vport;
3842 struct device *dev;
3843 unsigned long flags;
3844 size_t size;
3845 int error;
3846
3847 *ret_vport = NULL;
3848
3849 if ( ! fci->f->vport_create)
3850 return -ENOENT;
3851
3852 size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3853 vport = kzalloc(size, GFP_KERNEL);
3854 if (unlikely(!vport)) {
3855 printk(KERN_ERR "%s: allocation failure\n", __func__);
3856 return -ENOMEM;
3857 }
3858
3859 vport->vport_state = FC_VPORT_UNKNOWN;
3860 vport->vport_last_state = FC_VPORT_UNKNOWN;
3861 vport->node_name = ids->node_name;
3862 vport->port_name = ids->port_name;
3863 vport->roles = ids->roles;
3864 vport->vport_type = ids->vport_type;
3865 if (fci->f->dd_fcvport_size)
3866 vport->dd_data = &vport[1];
3867 vport->shost = shost;
3868 vport->channel = channel;
3869 vport->flags = FC_VPORT_CREATING;
3870 INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3871
3872 spin_lock_irqsave(shost->host_lock, flags);
3873
3874 if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3875 spin_unlock_irqrestore(shost->host_lock, flags);
3876 kfree(vport);
3877 return -ENOSPC;
3878 }
3879 fc_host->npiv_vports_inuse++;
3880 vport->number = fc_host->next_vport_number++;
3881 list_add_tail(&vport->peers, &fc_host->vports);
3882 scsi_host_get(shost); /* for fc_host->vport list */
3883
3884 spin_unlock_irqrestore(shost->host_lock, flags);
3885
3886 dev = &vport->dev;
3887 device_initialize(dev); /* takes self reference */
3888 dev->parent = get_device(pdev); /* takes parent reference */
3889 dev->release = fc_vport_dev_release;
3890 dev_set_name(dev, "vport-%d:%d-%d",
3891 shost->host_no, channel, vport->number);
3892 transport_setup_device(dev);
3893
3894 error = device_add(dev);
3895 if (error) {
3896 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3897 goto delete_vport;
3898 }
3899 transport_add_device(dev);
3900 transport_configure_device(dev);
3901
3902 error = fci->f->vport_create(vport, ids->disable);
3903 if (error) {
3904 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3905 goto delete_vport_all;
3906 }
3907
3908 /*
3909 * if the parent isn't the physical adapter's Scsi_Host, ensure
3910 * the Scsi_Host at least contains a symlink to the vport.
3911 */
3912 if (pdev != &shost->shost_gendev) {
3913 error = sysfs_create_link(&shost->shost_gendev.kobj,
3914 &dev->kobj, dev_name(dev));
3915 if (error)
3916 printk(KERN_ERR
3917 "%s: Cannot create vport symlinks for "
3918 "%s, err=%d\n",
3919 __func__, dev_name(dev), error);
3920 }
3921 spin_lock_irqsave(shost->host_lock, flags);
3922 vport->flags &= ~FC_VPORT_CREATING;
3923 spin_unlock_irqrestore(shost->host_lock, flags);
3924
3925 dev_printk(KERN_NOTICE, pdev,
3926 "%s created via shost%d channel %d\n", dev_name(dev),
3927 shost->host_no, channel);
3928
3929 *ret_vport = vport;
3930
3931 return 0;
3932
3933 delete_vport_all:
3934 transport_remove_device(dev);
3935 device_del(dev);
3936 delete_vport:
3937 transport_destroy_device(dev);
3938 spin_lock_irqsave(shost->host_lock, flags);
3939 list_del(&vport->peers);
3940 scsi_host_put(shost); /* for fc_host->vport list */
3941 fc_host->npiv_vports_inuse--;
3942 spin_unlock_irqrestore(shost->host_lock, flags);
3943 put_device(dev->parent);
3944 kfree(vport);
3945
3946 return error;
3947 }
3948
3949 /**
3950 * fc_vport_create - Admin App or LLDD requests creation of a vport
3951 * @shost: scsi host the virtual port is connected to.
3952 * @channel: channel on shost port connected to.
3953 * @ids: The world wide names, FC4 port roles, etc for
3954 * the virtual port.
3955 *
3956 * Notes:
3957 * This routine assumes no locks are held on entry.
3958 */
3959 struct fc_vport *
fc_vport_create(struct Scsi_Host * shost,int channel,struct fc_vport_identifiers * ids)3960 fc_vport_create(struct Scsi_Host *shost, int channel,
3961 struct fc_vport_identifiers *ids)
3962 {
3963 int stat;
3964 struct fc_vport *vport;
3965
3966 stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3967 ids, &vport);
3968 return stat ? NULL : vport;
3969 }
3970 EXPORT_SYMBOL(fc_vport_create);
3971
3972 /**
3973 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3974 * @vport: fc_vport to be terminated
3975 *
3976 * Calls the LLDD vport_delete() function, then deallocates and removes
3977 * the vport from the shost and object tree.
3978 *
3979 * Notes:
3980 * This routine assumes no locks are held on entry.
3981 */
3982 int
fc_vport_terminate(struct fc_vport * vport)3983 fc_vport_terminate(struct fc_vport *vport)
3984 {
3985 struct Scsi_Host *shost = vport_to_shost(vport);
3986 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3987 struct fc_internal *i = to_fc_internal(shost->transportt);
3988 struct device *dev = &vport->dev;
3989 unsigned long flags;
3990 int stat;
3991
3992 if (i->f->vport_delete)
3993 stat = i->f->vport_delete(vport);
3994 else
3995 stat = -ENOENT;
3996
3997 spin_lock_irqsave(shost->host_lock, flags);
3998 vport->flags &= ~FC_VPORT_DELETING;
3999 if (!stat) {
4000 vport->flags |= FC_VPORT_DELETED;
4001 list_del(&vport->peers);
4002 fc_host->npiv_vports_inuse--;
4003 scsi_host_put(shost); /* for fc_host->vport list */
4004 }
4005 spin_unlock_irqrestore(shost->host_lock, flags);
4006
4007 if (stat)
4008 return stat;
4009
4010 if (dev->parent != &shost->shost_gendev)
4011 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
4012 transport_remove_device(dev);
4013 device_del(dev);
4014 transport_destroy_device(dev);
4015
4016 /*
4017 * Removing our self-reference should mean our
4018 * release function gets called, which will drop the remaining
4019 * parent reference and free the data structure.
4020 */
4021 put_device(dev); /* for self-reference */
4022
4023 return 0; /* SUCCESS */
4024 }
4025 EXPORT_SYMBOL(fc_vport_terminate);
4026
4027 /**
4028 * fc_vport_sched_delete - workq-based delete request for a vport
4029 * @work: vport to be deleted.
4030 */
4031 static void
fc_vport_sched_delete(struct work_struct * work)4032 fc_vport_sched_delete(struct work_struct *work)
4033 {
4034 struct fc_vport *vport =
4035 container_of(work, struct fc_vport, vport_delete_work);
4036 int stat;
4037
4038 stat = fc_vport_terminate(vport);
4039 if (stat)
4040 dev_printk(KERN_ERR, vport->dev.parent,
4041 "%s: %s could not be deleted created via "
4042 "shost%d channel %d - error %d\n", __func__,
4043 dev_name(&vport->dev), vport->shost->host_no,
4044 vport->channel, stat);
4045 }
4046
4047
4048 /*
4049 * BSG support
4050 */
4051
4052 /**
4053 * fc_bsg_job_timeout - handler for when a bsg request timesout
4054 * @req: request that timed out
4055 */
4056 static enum blk_eh_timer_return
fc_bsg_job_timeout(struct request * req)4057 fc_bsg_job_timeout(struct request *req)
4058 {
4059 struct bsg_job *job = blk_mq_rq_to_pdu(req);
4060 struct Scsi_Host *shost = fc_bsg_to_shost(job);
4061 struct fc_rport *rport = fc_bsg_to_rport(job);
4062 struct fc_internal *i = to_fc_internal(shost->transportt);
4063 int err = 0, inflight = 0;
4064
4065 if (rport && rport->port_state == FC_PORTSTATE_BLOCKED)
4066 return BLK_EH_RESET_TIMER;
4067
4068 inflight = bsg_job_get(job);
4069
4070 if (inflight && i->f->bsg_timeout) {
4071 /* call LLDD to abort the i/o as it has timed out */
4072 err = i->f->bsg_timeout(job);
4073 if (err == -EAGAIN) {
4074 bsg_job_put(job);
4075 return BLK_EH_RESET_TIMER;
4076 } else if (err)
4077 printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
4078 "abort failed with status %d\n", err);
4079 }
4080
4081 /* the blk_end_sync_io() doesn't check the error */
4082 if (inflight)
4083 blk_mq_end_request(req, BLK_STS_IOERR);
4084 return BLK_EH_DONE;
4085 }
4086
4087 /**
4088 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
4089 * @shost: scsi host rport attached to
4090 * @job: bsg job to be processed
4091 */
fc_bsg_host_dispatch(struct Scsi_Host * shost,struct bsg_job * job)4092 static int fc_bsg_host_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
4093 {
4094 struct fc_internal *i = to_fc_internal(shost->transportt);
4095 struct fc_bsg_request *bsg_request = job->request;
4096 struct fc_bsg_reply *bsg_reply = job->reply;
4097 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
4098 int ret;
4099
4100 /* check if we really have all the request data needed */
4101 if (job->request_len < cmdlen) {
4102 ret = -ENOMSG;
4103 goto fail_host_msg;
4104 }
4105
4106 /* Validate the host command */
4107 switch (bsg_request->msgcode) {
4108 case FC_BSG_HST_ADD_RPORT:
4109 cmdlen += sizeof(struct fc_bsg_host_add_rport);
4110 break;
4111
4112 case FC_BSG_HST_DEL_RPORT:
4113 cmdlen += sizeof(struct fc_bsg_host_del_rport);
4114 break;
4115
4116 case FC_BSG_HST_ELS_NOLOGIN:
4117 cmdlen += sizeof(struct fc_bsg_host_els);
4118 /* there better be a xmt and rcv payloads */
4119 if ((!job->request_payload.payload_len) ||
4120 (!job->reply_payload.payload_len)) {
4121 ret = -EINVAL;
4122 goto fail_host_msg;
4123 }
4124 break;
4125
4126 case FC_BSG_HST_CT:
4127 cmdlen += sizeof(struct fc_bsg_host_ct);
4128 /* there better be xmt and rcv payloads */
4129 if ((!job->request_payload.payload_len) ||
4130 (!job->reply_payload.payload_len)) {
4131 ret = -EINVAL;
4132 goto fail_host_msg;
4133 }
4134 break;
4135
4136 case FC_BSG_HST_VENDOR:
4137 cmdlen += sizeof(struct fc_bsg_host_vendor);
4138 if ((shost->hostt->vendor_id == 0L) ||
4139 (bsg_request->rqst_data.h_vendor.vendor_id !=
4140 shost->hostt->vendor_id)) {
4141 ret = -ESRCH;
4142 goto fail_host_msg;
4143 }
4144 break;
4145
4146 default:
4147 ret = -EBADR;
4148 goto fail_host_msg;
4149 }
4150
4151 ret = i->f->bsg_request(job);
4152 if (!ret)
4153 return 0;
4154
4155 fail_host_msg:
4156 /* return the errno failure code as the only status */
4157 BUG_ON(job->reply_len < sizeof(uint32_t));
4158 bsg_reply->reply_payload_rcv_len = 0;
4159 bsg_reply->result = ret;
4160 job->reply_len = sizeof(uint32_t);
4161 bsg_job_done(job, bsg_reply->result,
4162 bsg_reply->reply_payload_rcv_len);
4163 return 0;
4164 }
4165
4166
4167 /*
4168 * fc_bsg_goose_queue - restart rport queue in case it was stopped
4169 * @rport: rport to be restarted
4170 */
4171 static void
fc_bsg_goose_queue(struct fc_rport * rport)4172 fc_bsg_goose_queue(struct fc_rport *rport)
4173 {
4174 struct request_queue *q = rport->rqst_q;
4175
4176 if (q)
4177 blk_mq_run_hw_queues(q, true);
4178 }
4179
4180 /**
4181 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
4182 * @shost: scsi host rport attached to
4183 * @job: bsg job to be processed
4184 */
fc_bsg_rport_dispatch(struct Scsi_Host * shost,struct bsg_job * job)4185 static int fc_bsg_rport_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
4186 {
4187 struct fc_internal *i = to_fc_internal(shost->transportt);
4188 struct fc_bsg_request *bsg_request = job->request;
4189 struct fc_bsg_reply *bsg_reply = job->reply;
4190 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
4191 int ret;
4192
4193 /* check if we really have all the request data needed */
4194 if (job->request_len < cmdlen) {
4195 ret = -ENOMSG;
4196 goto fail_rport_msg;
4197 }
4198
4199 /* Validate the rport command */
4200 switch (bsg_request->msgcode) {
4201 case FC_BSG_RPT_ELS:
4202 cmdlen += sizeof(struct fc_bsg_rport_els);
4203 goto check_bidi;
4204
4205 case FC_BSG_RPT_CT:
4206 cmdlen += sizeof(struct fc_bsg_rport_ct);
4207 check_bidi:
4208 /* there better be xmt and rcv payloads */
4209 if ((!job->request_payload.payload_len) ||
4210 (!job->reply_payload.payload_len)) {
4211 ret = -EINVAL;
4212 goto fail_rport_msg;
4213 }
4214 break;
4215 default:
4216 ret = -EBADR;
4217 goto fail_rport_msg;
4218 }
4219
4220 ret = i->f->bsg_request(job);
4221 if (!ret)
4222 return 0;
4223
4224 fail_rport_msg:
4225 /* return the errno failure code as the only status */
4226 BUG_ON(job->reply_len < sizeof(uint32_t));
4227 bsg_reply->reply_payload_rcv_len = 0;
4228 bsg_reply->result = ret;
4229 job->reply_len = sizeof(uint32_t);
4230 bsg_job_done(job, bsg_reply->result,
4231 bsg_reply->reply_payload_rcv_len);
4232 return 0;
4233 }
4234
fc_bsg_dispatch(struct bsg_job * job)4235 static int fc_bsg_dispatch(struct bsg_job *job)
4236 {
4237 struct Scsi_Host *shost = fc_bsg_to_shost(job);
4238
4239 if (scsi_is_fc_rport(job->dev))
4240 return fc_bsg_rport_dispatch(shost, job);
4241 else
4242 return fc_bsg_host_dispatch(shost, job);
4243 }
4244
fc_bsg_rport_prep(struct fc_rport * rport)4245 static blk_status_t fc_bsg_rport_prep(struct fc_rport *rport)
4246 {
4247 if (rport->port_state == FC_PORTSTATE_BLOCKED &&
4248 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
4249 return BLK_STS_RESOURCE;
4250
4251 if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
4252 (rport->port_state != FC_PORTSTATE_MARGINAL))
4253 return BLK_STS_IOERR;
4254
4255 return BLK_STS_OK;
4256 }
4257
4258
fc_bsg_dispatch_prep(struct bsg_job * job)4259 static int fc_bsg_dispatch_prep(struct bsg_job *job)
4260 {
4261 struct fc_rport *rport = fc_bsg_to_rport(job);
4262 blk_status_t ret;
4263
4264 ret = fc_bsg_rport_prep(rport);
4265 switch (ret) {
4266 case BLK_STS_OK:
4267 break;
4268 case BLK_STS_RESOURCE:
4269 return -EAGAIN;
4270 default:
4271 return -EIO;
4272 }
4273
4274 return fc_bsg_dispatch(job);
4275 }
4276
4277 /**
4278 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
4279 * @shost: shost for fc_host
4280 * @fc_host: fc_host adding the structures to
4281 */
4282 static int
fc_bsg_hostadd(struct Scsi_Host * shost,struct fc_host_attrs * fc_host)4283 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
4284 {
4285 struct device *dev = &shost->shost_gendev;
4286 struct fc_internal *i = to_fc_internal(shost->transportt);
4287 struct queue_limits lim;
4288 struct request_queue *q;
4289 char bsg_name[20];
4290
4291 fc_host->rqst_q = NULL;
4292
4293 if (!i->f->bsg_request)
4294 return -ENOTSUPP;
4295
4296 snprintf(bsg_name, sizeof(bsg_name),
4297 "fc_host%d", shost->host_no);
4298 scsi_init_limits(shost, &lim);
4299 lim.max_segments = min_not_zero(lim.max_segments, i->f->max_bsg_segments);
4300 q = bsg_setup_queue(dev, bsg_name, &lim, fc_bsg_dispatch,
4301 fc_bsg_job_timeout, i->f->dd_bsg_size);
4302 if (IS_ERR(q)) {
4303 dev_err(dev,
4304 "fc_host%d: bsg interface failed to initialize - setup queue\n",
4305 shost->host_no);
4306 return PTR_ERR(q);
4307 }
4308 blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4309 fc_host->rqst_q = q;
4310 return 0;
4311 }
4312
4313 /**
4314 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4315 * @shost: shost that rport is attached to
4316 * @rport: rport that the bsg hooks are being attached to
4317 */
4318 static int
fc_bsg_rportadd(struct Scsi_Host * shost,struct fc_rport * rport)4319 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4320 {
4321 struct device *dev = &rport->dev;
4322 struct fc_internal *i = to_fc_internal(shost->transportt);
4323 struct queue_limits lim;
4324 struct request_queue *q;
4325
4326 rport->rqst_q = NULL;
4327
4328 if (!i->f->bsg_request)
4329 return -ENOTSUPP;
4330
4331 scsi_init_limits(shost, &lim);
4332 lim.max_segments = min_not_zero(lim.max_segments, i->f->max_bsg_segments);
4333 q = bsg_setup_queue(dev, dev_name(dev), &lim, fc_bsg_dispatch_prep,
4334 fc_bsg_job_timeout, i->f->dd_bsg_size);
4335 if (IS_ERR(q)) {
4336 dev_err(dev, "failed to setup bsg queue\n");
4337 return PTR_ERR(q);
4338 }
4339 blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4340 rport->rqst_q = q;
4341 return 0;
4342 }
4343
4344
4345 /**
4346 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4347 * @q: the request_queue that is to be torn down.
4348 *
4349 * Notes:
4350 * Before unregistering the queue empty any requests that are blocked
4351 *
4352 *
4353 */
4354 static void
fc_bsg_remove(struct request_queue * q)4355 fc_bsg_remove(struct request_queue *q)
4356 {
4357 bsg_remove_queue(q);
4358 }
4359
4360
4361 /* Original Author: Martin Hicks */
4362 MODULE_AUTHOR("James Smart");
4363 MODULE_DESCRIPTION("FC Transport Attributes");
4364 MODULE_LICENSE("GPL");
4365
4366 module_init(fc_transport_init);
4367 module_exit(fc_transport_exit);
4368