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