scsi_transport_fc.c 72.6 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
/* 
 *  FiberChannel transport specific attributes exported to sysfs.
 *
 *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  ========
 *
 *  Copyright (C) 2004-2005   James Smart, Emulex Corporation
 *    Rewrite for host, target, device, and remote port attributes,
 *    statistics, and service functions...
 *
 */
#include <linux/module.h>
#include <linux/init.h>
Tim Schmielau's avatar
Tim Schmielau committed
29
#include <linux/sched.h>	/* workqueue stuff, HZ */
Linus Torvalds's avatar
Linus Torvalds committed
30 31 32 33
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
34
#include <scsi/scsi_cmnd.h>
35 36 37
#include <linux/netlink.h>
#include <net/netlink.h>
#include <scsi/scsi_netlink_fc.h>
Linus Torvalds's avatar
Linus Torvalds committed
38 39
#include "scsi_priv.h"

40 41
static int fc_queue_work(struct Scsi_Host *, struct work_struct *);

Linus Torvalds's avatar
Linus Torvalds committed
42 43 44 45 46 47 48 49 50 51 52 53 54 55
/*
 * Redefine so that we can have same named attributes in the
 * sdev/starget/host objects.
 */
#define FC_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)		\
struct class_device_attribute class_device_attr_##_prefix##_##_name = 	\
	__ATTR(_name,_mode,_show,_store)

#define fc_enum_name_search(title, table_type, table)			\
static const char *get_fc_##title##_name(enum table_type table_key)	\
{									\
	int i;								\
	char *name = NULL;						\
									\
56
	for (i = 0; i < ARRAY_SIZE(table); i++) {			\
Linus Torvalds's avatar
Linus Torvalds committed
57 58 59 60 61 62 63 64 65 66 67 68 69 70
		if (table[i].value == table_key) {			\
			name = table[i].name;				\
			break;						\
		}							\
	}								\
	return name;							\
}

#define fc_enum_name_match(title, table_type, table)			\
static int get_fc_##title##_match(const char *table_key,		\
		enum table_type *value)					\
{									\
	int i;								\
									\
71
	for (i = 0; i < ARRAY_SIZE(table); i++) {			\
Linus Torvalds's avatar
Linus Torvalds committed
72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98
		if (strncmp(table_key, table[i].name,			\
				table[i].matchlen) == 0) {		\
			*value = table[i].value;			\
			return 0; /* success */				\
		}							\
	}								\
	return 1; /* failure */						\
}


/* Convert fc_port_type values to ascii string name */
static struct {
	enum fc_port_type	value;
	char			*name;
} fc_port_type_names[] = {
	{ FC_PORTTYPE_UNKNOWN,		"Unknown" },
	{ FC_PORTTYPE_OTHER,		"Other" },
	{ FC_PORTTYPE_NOTPRESENT,	"Not Present" },
	{ FC_PORTTYPE_NPORT,	"NPort (fabric via point-to-point)" },
	{ FC_PORTTYPE_NLPORT,	"NLPort (fabric via loop)" },
	{ FC_PORTTYPE_LPORT,	"LPort (private loop)" },
	{ FC_PORTTYPE_PTP,	"Point-To-Point (direct nport connection" },
};
fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
#define FC_PORTTYPE_MAX_NAMELEN		50


99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121
/* Convert fc_host_event_code values to ascii string name */
static const struct {
	enum fc_host_event_code		value;
	char				*name;
} fc_host_event_code_names[] = {
	{ FCH_EVT_LIP,			"lip" },
	{ FCH_EVT_LINKUP,		"link_up" },
	{ FCH_EVT_LINKDOWN,		"link_down" },
	{ FCH_EVT_LIPRESET,		"lip_reset" },
	{ FCH_EVT_RSCN,			"rscn" },
	{ FCH_EVT_ADAPTER_CHANGE,	"adapter_chg" },
	{ FCH_EVT_PORT_UNKNOWN,		"port_unknown" },
	{ FCH_EVT_PORT_ONLINE,		"port_online" },
	{ FCH_EVT_PORT_OFFLINE,		"port_offline" },
	{ FCH_EVT_PORT_FABRIC,		"port_fabric" },
	{ FCH_EVT_LINK_UNKNOWN,		"link_unknown" },
	{ FCH_EVT_VENDOR_UNIQUE,	"vendor_unique" },
};
fc_enum_name_search(host_event_code, fc_host_event_code,
		fc_host_event_code_names)
#define FC_HOST_EVENT_CODE_MAX_NAMELEN	30


Linus Torvalds's avatar
Linus Torvalds committed
122 123 124 125 126 127 128 129 130 131 132 133 134 135 136
/* Convert fc_port_state values to ascii string name */
static struct {
	enum fc_port_state	value;
	char			*name;
} fc_port_state_names[] = {
	{ FC_PORTSTATE_UNKNOWN,		"Unknown" },
	{ FC_PORTSTATE_NOTPRESENT,	"Not Present" },
	{ FC_PORTSTATE_ONLINE,		"Online" },
	{ FC_PORTSTATE_OFFLINE,		"Offline" },
	{ FC_PORTSTATE_BLOCKED,		"Blocked" },
	{ FC_PORTSTATE_BYPASSED,	"Bypassed" },
	{ FC_PORTSTATE_DIAGNOSTICS,	"Diagnostics" },
	{ FC_PORTSTATE_LINKDOWN,	"Linkdown" },
	{ FC_PORTSTATE_ERROR,		"Error" },
	{ FC_PORTSTATE_LOOPBACK,	"Loopback" },
137
	{ FC_PORTSTATE_DELETED,		"Deleted" },
Linus Torvalds's avatar
Linus Torvalds committed
138 139 140 141 142 143
};
fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
#define FC_PORTSTATE_MAX_NAMELEN	20


/* Convert fc_tgtid_binding_type values to ascii string name */
144
static const struct {
Linus Torvalds's avatar
Linus Torvalds committed
145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168
	enum fc_tgtid_binding_type	value;
	char				*name;
	int				matchlen;
} fc_tgtid_binding_type_names[] = {
	{ FC_TGTID_BIND_NONE, "none", 4 },
	{ FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
	{ FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
	{ FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
};
fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
		fc_tgtid_binding_type_names)
fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
		fc_tgtid_binding_type_names)
#define FC_BINDTYPE_MAX_NAMELEN	30


#define fc_bitfield_name_search(title, table)			\
static ssize_t							\
get_fc_##title##_names(u32 table_key, char *buf)		\
{								\
	char *prefix = "";					\
	ssize_t len = 0;					\
	int i;							\
								\
169
	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
Linus Torvalds's avatar
Linus Torvalds committed
170 171 172 173 174 175 176 177 178 179 180 181
		if (table[i].value & table_key) {		\
			len += sprintf(buf + len, "%s%s",	\
				prefix, table[i].name);		\
			prefix = ", ";				\
		}						\
	}							\
	len += sprintf(buf + len, "\n");			\
	return len;						\
}


/* Convert FC_COS bit values to ascii string name */
182
static const struct {
Linus Torvalds's avatar
Linus Torvalds committed
183 184 185 186 187 188 189 190 191 192 193 194 195
	u32 			value;
	char			*name;
} fc_cos_names[] = {
	{ FC_COS_CLASS1,	"Class 1" },
	{ FC_COS_CLASS2,	"Class 2" },
	{ FC_COS_CLASS3,	"Class 3" },
	{ FC_COS_CLASS4,	"Class 4" },
	{ FC_COS_CLASS6,	"Class 6" },
};
fc_bitfield_name_search(cos, fc_cos_names)


/* Convert FC_PORTSPEED bit values to ascii string name */
196
static const struct {
Linus Torvalds's avatar
Linus Torvalds committed
197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221
	u32 			value;
	char			*name;
} fc_port_speed_names[] = {
	{ FC_PORTSPEED_1GBIT,		"1 Gbit" },
	{ FC_PORTSPEED_2GBIT,		"2 Gbit" },
	{ FC_PORTSPEED_4GBIT,		"4 Gbit" },
	{ FC_PORTSPEED_10GBIT,		"10 Gbit" },
	{ FC_PORTSPEED_NOT_NEGOTIATED,	"Not Negotiated" },
};
fc_bitfield_name_search(port_speed, fc_port_speed_names)


static int
show_fc_fc4s (char *buf, u8 *fc4_list)
{
	int i, len=0;

	for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
		len += sprintf(buf + len , "0x%02x ", *fc4_list);
	len += sprintf(buf + len, "\n");
	return len;
}


/* Convert FC_RPORT_ROLE bit values to ascii string name */
222
static const struct {
Linus Torvalds's avatar
Linus Torvalds committed
223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243
	u32 			value;
	char			*name;
} fc_remote_port_role_names[] = {
	{ FC_RPORT_ROLE_FCP_TARGET,	"FCP Target" },
	{ FC_RPORT_ROLE_FCP_INITIATOR,	"FCP Initiator" },
	{ FC_RPORT_ROLE_IP_PORT,	"IP Port" },
};
fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names)

/*
 * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 */
#define FC_WELLKNOWN_PORTID_MASK	0xfffff0
#define FC_WELLKNOWN_ROLE_MASK  	0x00000f
#define FC_FPORT_PORTID			0x00000e
#define FC_FABCTLR_PORTID		0x00000d
#define FC_DIRSRVR_PORTID		0x00000c
#define FC_TIMESRVR_PORTID		0x00000b
#define FC_MGMTSRVR_PORTID		0x00000a


244
static void fc_timeout_deleted_rport(void *data);
245
static void fc_timeout_fail_rport_io(void *data);
Linus Torvalds's avatar
Linus Torvalds committed
246 247 248 249 250 251 252
static void fc_scsi_scan_rport(void *data);

/*
 * Attribute counts pre object type...
 * Increase these values if you add attributes
 */
#define FC_STARGET_NUM_ATTRS 	3
253
#define FC_RPORT_NUM_ATTRS	10
254
#define FC_HOST_NUM_ATTRS	17
Linus Torvalds's avatar
Linus Torvalds committed
255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283

struct fc_internal {
	struct scsi_transport_template t;
	struct fc_function_template *f;

	/*
	 * For attributes : each object has :
	 *   An array of the actual attributes structures
	 *   An array of null-terminated pointers to the attribute
	 *     structures - used for mid-layer interaction.
	 *
	 * The attribute containers for the starget and host are are
	 * part of the midlayer. As the remote port is specific to the
	 * fc transport, we must provide the attribute container.
	 */
	struct class_device_attribute private_starget_attrs[
							FC_STARGET_NUM_ATTRS];
	struct class_device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];

	struct class_device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
	struct class_device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];

	struct transport_container rport_attr_cont;
	struct class_device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
	struct class_device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
};

#define to_fc_internal(tmpl)	container_of(tmpl, struct fc_internal, t)

284 285
static int fc_target_setup(struct transport_container *tc, struct device *dev,
			   struct class_device *cdev)
Linus Torvalds's avatar
Linus Torvalds committed
286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313
{
	struct scsi_target *starget = to_scsi_target(dev);
	struct fc_rport *rport = starget_to_rport(starget);

	/*
	 * if parent is remote port, use values from remote port.
	 * Otherwise, this host uses the fc_transport, but not the
	 * remote port interface. As such, initialize to known non-values.
	 */
	if (rport) {
		fc_starget_node_name(starget) = rport->node_name;
		fc_starget_port_name(starget) = rport->port_name;
		fc_starget_port_id(starget) = rport->port_id;
	} else {
		fc_starget_node_name(starget) = -1;
		fc_starget_port_name(starget) = -1;
		fc_starget_port_id(starget) = -1;
	}

	return 0;
}

static DECLARE_TRANSPORT_CLASS(fc_transport_class,
			       "fc_transport",
			       fc_target_setup,
			       NULL,
			       NULL);

314 315
static int fc_host_setup(struct transport_container *tc, struct device *dev,
			 struct class_device *cdev)
Linus Torvalds's avatar
Linus Torvalds committed
316 317
{
	struct Scsi_Host *shost = dev_to_shost(dev);
318
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
Linus Torvalds's avatar
Linus Torvalds committed
319 320 321 322 323 324

	/* 
	 * Set default values easily detected by the midlayer as
	 * failure cases.  The scsi lldd is responsible for initializing
	 * all transport attributes to valid values per host.
	 */
325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342
	fc_host->node_name = -1;
	fc_host->port_name = -1;
	fc_host->permanent_port_name = -1;
	fc_host->supported_classes = FC_COS_UNSPECIFIED;
	memset(fc_host->supported_fc4s, 0,
		sizeof(fc_host->supported_fc4s));
	fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
	fc_host->maxframe_size = -1;
	memset(fc_host->serial_number, 0,
		sizeof(fc_host->serial_number));

	fc_host->port_id = -1;
	fc_host->port_type = FC_PORTTYPE_UNKNOWN;
	fc_host->port_state = FC_PORTSTATE_UNKNOWN;
	memset(fc_host->active_fc4s, 0,
		sizeof(fc_host->active_fc4s));
	fc_host->speed = FC_PORTSPEED_UNKNOWN;
	fc_host->fabric_name = -1;
343 344
	memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
	memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369

	fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;

	INIT_LIST_HEAD(&fc_host->rports);
	INIT_LIST_HEAD(&fc_host->rport_bindings);
	fc_host->next_rport_number = 0;
	fc_host->next_target_id = 0;

	snprintf(fc_host->work_q_name, KOBJ_NAME_LEN, "fc_wq_%d",
		shost->host_no);
	fc_host->work_q = create_singlethread_workqueue(
					fc_host->work_q_name);
	if (!fc_host->work_q)
		return -ENOMEM;

	snprintf(fc_host->devloss_work_q_name, KOBJ_NAME_LEN, "fc_dl_%d",
		shost->host_no);
	fc_host->devloss_work_q = create_singlethread_workqueue(
					fc_host->devloss_work_q_name);
	if (!fc_host->devloss_work_q) {
		destroy_workqueue(fc_host->work_q);
		fc_host->work_q = NULL;
		return -ENOMEM;
	}

Linus Torvalds's avatar
Linus Torvalds committed
370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397
	return 0;
}

static DECLARE_TRANSPORT_CLASS(fc_host_class,
			       "fc_host",
			       fc_host_setup,
			       NULL,
			       NULL);

/*
 * Setup and Remove actions for remote ports are handled
 * in the service functions below.
 */
static DECLARE_TRANSPORT_CLASS(fc_rport_class,
			       "fc_remote_ports",
			       NULL,
			       NULL,
			       NULL);

/*
 * Module Parameters
 */

/*
 * dev_loss_tmo: the default number of seconds that the FC transport
 *   should insulate the loss of a remote port.
 *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 */
398
static unsigned int fc_dev_loss_tmo = 60;		/* seconds */
Linus Torvalds's avatar
Linus Torvalds committed
399 400 401 402 403 404 405 406

module_param_named(dev_loss_tmo, fc_dev_loss_tmo, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(dev_loss_tmo,
		 "Maximum number of seconds that the FC transport should"
		 " insulate the loss of a remote port. Once this value is"
		 " exceeded, the scsi target is removed. Value should be"
		 " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");

407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482
/**
 * Netlink Infrastructure
 **/

static atomic_t fc_event_seq;

/**
 * fc_get_event_number - Obtain the next sequential FC event number
 *
 * Notes:
 *   We could have inline'd this, but it would have required fc_event_seq to
 *   be exposed. For now, live with the subroutine call.
 *   Atomic used to avoid lock/unlock...
 **/
u32
fc_get_event_number(void)
{
	return atomic_add_return(1, &fc_event_seq);
}
EXPORT_SYMBOL(fc_get_event_number);


/**
 * fc_host_post_event - called to post an even on an fc_host.
 *
 * @shost:		host the event occurred on
 * @event_number:	fc event number obtained from get_fc_event_number()
 * @event_code:		fc_host event being posted
 * @event_data:		32bits of data for the event being posted
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
void
fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
		enum fc_host_event_code event_code, u32 event_data)
{
	struct sk_buff *skb;
	struct nlmsghdr	*nlh;
	struct fc_nl_event *event;
	const char *name;
	u32 len, skblen;
	int err;

	if (!scsi_nl_sock) {
		err = -ENOENT;
		goto send_fail;
	}

	len = FC_NL_MSGALIGN(sizeof(*event));
	skblen = NLMSG_SPACE(len);

	skb = alloc_skb(skblen, GFP_KERNEL);
	if (!skb) {
		err = -ENOBUFS;
		goto send_fail;
	}

	nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
				skblen - sizeof(*nlh), 0);
	if (!nlh) {
		err = -ENOBUFS;
		goto send_fail_skb;
	}
	event = NLMSG_DATA(nlh);

	INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
				FC_NL_ASYNC_EVENT, len);
	event->seconds = get_seconds();
	event->vendor_id = 0;
	event->host_no = shost->host_no;
	event->event_datalen = sizeof(u32);	/* bytes */
	event->event_num = event_number;
	event->event_code = event_code;
	event->event_data = event_data;

483 484
	err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
			      GFP_KERNEL);
485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517
	if (err && (err != -ESRCH))	/* filter no recipient errors */
		/* nlmsg_multicast already kfree_skb'd */
		goto send_fail;

	return;

send_fail_skb:
	kfree_skb(skb);
send_fail:
	name = get_fc_host_event_code_name(event_code);
	printk(KERN_WARNING
		"%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
		__FUNCTION__, shost->host_no,
		(name) ? name : "<unknown>", event_data, err);
	return;
}
EXPORT_SYMBOL(fc_host_post_event);


/**
 * fc_host_post_vendor_event - called to post a vendor unique event on
 *                             a fc_host
 *
 * @shost:		host the event occurred on
 * @event_number:	fc event number obtained from get_fc_event_number()
 * @data_len:		amount, in bytes, of vendor unique data
 * @data_buf:		pointer to vendor unique data
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
void
fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
518
		u32 data_len, char * data_buf, u64 vendor_id)
519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557
{
	struct sk_buff *skb;
	struct nlmsghdr	*nlh;
	struct fc_nl_event *event;
	u32 len, skblen;
	int err;

	if (!scsi_nl_sock) {
		err = -ENOENT;
		goto send_vendor_fail;
	}

	len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
	skblen = NLMSG_SPACE(len);

	skb = alloc_skb(skblen, GFP_KERNEL);
	if (!skb) {
		err = -ENOBUFS;
		goto send_vendor_fail;
	}

	nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
				skblen - sizeof(*nlh), 0);
	if (!nlh) {
		err = -ENOBUFS;
		goto send_vendor_fail_skb;
	}
	event = NLMSG_DATA(nlh);

	INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
				FC_NL_ASYNC_EVENT, len);
	event->seconds = get_seconds();
	event->vendor_id = vendor_id;
	event->host_no = shost->host_no;
	event->event_datalen = data_len;	/* bytes */
	event->event_num = event_number;
	event->event_code = FCH_EVT_VENDOR_UNIQUE;
	memcpy(&event->event_data, data_buf, data_len);

558 559
	err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
			      GFP_KERNEL);
560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576
	if (err && (err != -ESRCH))	/* filter no recipient errors */
		/* nlmsg_multicast already kfree_skb'd */
		goto send_vendor_fail;

	return;

send_vendor_fail_skb:
	kfree_skb(skb);
send_vendor_fail:
	printk(KERN_WARNING
		"%s: Dropped Event : host %d vendor_unique - err %d\n",
		__FUNCTION__, shost->host_no, err);
	return;
}
EXPORT_SYMBOL(fc_host_post_vendor_event);


Linus Torvalds's avatar
Linus Torvalds committed
577 578 579

static __init int fc_transport_init(void)
{
580 581 582 583 584
	int error;

	atomic_set(&fc_event_seq, 0);

	error = transport_class_register(&fc_host_class);
Linus Torvalds's avatar
Linus Torvalds committed
585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610
	if (error)
		return error;
	error = transport_class_register(&fc_rport_class);
	if (error)
		return error;
	return transport_class_register(&fc_transport_class);
}

static void __exit fc_transport_exit(void)
{
	transport_class_unregister(&fc_transport_class);
	transport_class_unregister(&fc_rport_class);
	transport_class_unregister(&fc_host_class);
}

/*
 * FC Remote Port Attribute Management
 */

#define fc_rport_show_function(field, format_string, sz, cast)		\
static ssize_t								\
show_fc_rport_##field (struct class_device *cdev, char *buf)		\
{									\
	struct fc_rport *rport = transport_class_to_rport(cdev);	\
	struct Scsi_Host *shost = rport_to_shost(rport);		\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
611 612
	if ((i->f->get_rport_##field) &&				\
	    !((rport->port_state == FC_PORTSTATE_BLOCKED) ||		\
613
	      (rport->port_state == FC_PORTSTATE_DELETED) ||		\
614
	      (rport->port_state == FC_PORTSTATE_NOTPRESENT)))		\
Linus Torvalds's avatar
Linus Torvalds committed
615 616 617 618 619 620 621 622 623 624 625 626 627
		i->f->get_rport_##field(rport);				\
	return snprintf(buf, sz, format_string, cast rport->field); 	\
}

#define fc_rport_store_function(field)					\
static ssize_t								\
store_fc_rport_##field(struct class_device *cdev, const char *buf,	\
			   size_t count)				\
{									\
	int val;							\
	struct fc_rport *rport = transport_class_to_rport(cdev);	\
	struct Scsi_Host *shost = rport_to_shost(rport);		\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
628
	char *cp;							\
629
	if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||		\
630
	    (rport->port_state == FC_PORTSTATE_DELETED) ||		\
631 632
	    (rport->port_state == FC_PORTSTATE_NOTPRESENT))		\
		return -EBUSY;						\
633 634 635
	val = simple_strtoul(buf, &cp, 0);				\
	if (*cp && (*cp != '\n'))					\
		return -EINVAL;						\
Linus Torvalds's avatar
Linus Torvalds committed
636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716
	i->f->set_rport_##field(rport, val);				\
	return count;							\
}

#define fc_rport_rd_attr(field, format_string, sz)			\
	fc_rport_show_function(field, format_string, sz, )		\
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,			\
			 show_fc_rport_##field, NULL)

#define fc_rport_rd_attr_cast(field, format_string, sz, cast)		\
	fc_rport_show_function(field, format_string, sz, (cast))	\
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,			\
			  show_fc_rport_##field, NULL)

#define fc_rport_rw_attr(field, format_string, sz)			\
	fc_rport_show_function(field, format_string, sz, )		\
	fc_rport_store_function(field)					\
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,		\
			show_fc_rport_##field,				\
			store_fc_rport_##field)


#define fc_private_rport_show_function(field, format_string, sz, cast)	\
static ssize_t								\
show_fc_rport_##field (struct class_device *cdev, char *buf)		\
{									\
	struct fc_rport *rport = transport_class_to_rport(cdev);	\
	return snprintf(buf, sz, format_string, cast rport->field); 	\
}

#define fc_private_rport_rd_attr(field, format_string, sz)		\
	fc_private_rport_show_function(field, format_string, sz, )	\
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,			\
			 show_fc_rport_##field, NULL)

#define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)	\
	fc_private_rport_show_function(field, format_string, sz, (cast)) \
static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,			\
			  show_fc_rport_##field, NULL)


#define fc_private_rport_rd_enum_attr(title, maxlen)			\
static ssize_t								\
show_fc_rport_##title (struct class_device *cdev, char *buf)		\
{									\
	struct fc_rport *rport = transport_class_to_rport(cdev);	\
	const char *name;						\
	name = get_fc_##title##_name(rport->title);			\
	if (!name)							\
		return -EINVAL;						\
	return snprintf(buf, maxlen, "%s\n", name);			\
}									\
static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO,			\
			show_fc_rport_##title, NULL)


#define SETUP_RPORT_ATTRIBUTE_RD(field)					\
	i->private_rport_attrs[count] = class_device_attr_rport_##field; \
	i->private_rport_attrs[count].attr.mode = S_IRUGO;		\
	i->private_rport_attrs[count].store = NULL;			\
	i->rport_attrs[count] = &i->private_rport_attrs[count];		\
	if (i->f->show_rport_##field)					\
		count++

#define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)				\
	i->private_rport_attrs[count] = class_device_attr_rport_##field; \
	i->private_rport_attrs[count].attr.mode = S_IRUGO;		\
	i->private_rport_attrs[count].store = NULL;			\
	i->rport_attrs[count] = &i->private_rport_attrs[count];		\
	count++

#define SETUP_RPORT_ATTRIBUTE_RW(field)					\
	i->private_rport_attrs[count] = class_device_attr_rport_##field; \
	if (!i->f->set_rport_##field) {					\
		i->private_rport_attrs[count].attr.mode = S_IRUGO;	\
		i->private_rport_attrs[count].store = NULL;		\
	}								\
	i->rport_attrs[count] = &i->private_rport_attrs[count];		\
	if (i->f->show_rport_##field)					\
		count++

717 718 719 720 721 722 723
#define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)				\
{									\
	i->private_rport_attrs[count] = class_device_attr_rport_##field; \
	i->rport_attrs[count] = &i->private_rport_attrs[count];		\
	count++;							\
}

Linus Torvalds's avatar
Linus Torvalds committed
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743

/* The FC Transport Remote Port Attributes: */

/* Fixed Remote Port Attributes */

fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);

static ssize_t
show_fc_rport_supported_classes (struct class_device *cdev, char *buf)
{
	struct fc_rport *rport = transport_class_to_rport(cdev);
	if (rport->supported_classes == FC_COS_UNSPECIFIED)
		return snprintf(buf, 20, "unspecified\n");
	return get_fc_cos_names(rport->supported_classes, buf);
}
static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
		show_fc_rport_supported_classes, NULL);

/* Dynamic Remote Port Attributes */

744 745 746 747 748 749 750 751 752 753 754 755
/*
 * dev_loss_tmo attribute
 */
fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
static ssize_t
store_fc_rport_dev_loss_tmo(struct class_device *cdev, const char *buf,
			   size_t count)
{
	int val;
	struct fc_rport *rport = transport_class_to_rport(cdev);
	struct Scsi_Host *shost = rport_to_shost(rport);
	struct fc_internal *i = to_fc_internal(shost->transportt);
756
	char *cp;
757
	if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
758
	    (rport->port_state == FC_PORTSTATE_DELETED) ||
759 760
	    (rport->port_state == FC_PORTSTATE_NOTPRESENT))
		return -EBUSY;
761 762 763
	val = simple_strtoul(buf, &cp, 0);
	if ((*cp && (*cp != '\n')) ||
	    (val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
764 765 766 767 768 769
		return -EINVAL;
	i->f->set_rport_dev_loss_tmo(rport, val);
	return count;
}
static FC_CLASS_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
		show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
Linus Torvalds's avatar
Linus Torvalds committed
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812


/* Private Remote Port Attributes */

fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);

static ssize_t
show_fc_rport_roles (struct class_device *cdev, char *buf)
{
	struct fc_rport *rport = transport_class_to_rport(cdev);

	/* identify any roles that are port_id specific */
	if ((rport->port_id != -1) &&
	    (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
					FC_WELLKNOWN_PORTID_MASK) {
		switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
		case FC_FPORT_PORTID:
			return snprintf(buf, 30, "Fabric Port\n");
		case FC_FABCTLR_PORTID:
			return snprintf(buf, 30, "Fabric Controller\n");
		case FC_DIRSRVR_PORTID:
			return snprintf(buf, 30, "Directory Server\n");
		case FC_TIMESRVR_PORTID:
			return snprintf(buf, 30, "Time Server\n");
		case FC_MGMTSRVR_PORTID:
			return snprintf(buf, 30, "Management Server\n");
		default:
			return snprintf(buf, 30, "Unknown Fabric Entity\n");
		}
	} else {
		if (rport->roles == FC_RPORT_ROLE_UNKNOWN)
			return snprintf(buf, 20, "unknown\n");
		return get_fc_remote_port_roles_names(rport->roles, buf);
	}
}
static FC_CLASS_DEVICE_ATTR(rport, roles, S_IRUGO,
		show_fc_rport_roles, NULL);

fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);

813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850
/*
 * fast_io_fail_tmo attribute
 */
static ssize_t
show_fc_rport_fast_io_fail_tmo (struct class_device *cdev, char *buf)
{
	struct fc_rport *rport = transport_class_to_rport(cdev);

	if (rport->fast_io_fail_tmo == -1)
		return snprintf(buf, 5, "off\n");
	return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
}

static ssize_t
store_fc_rport_fast_io_fail_tmo(struct class_device *cdev, const char *buf,
			   size_t count)
{
	int val;
	char *cp;
	struct fc_rport *rport = transport_class_to_rport(cdev);

	if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
	    (rport->port_state == FC_PORTSTATE_DELETED) ||
	    (rport->port_state == FC_PORTSTATE_NOTPRESENT))
		return -EBUSY;
	if (strncmp(buf, "off", 3) == 0)
		rport->fast_io_fail_tmo = -1;
	else {
		val = simple_strtoul(buf, &cp, 0);
		if ((*cp && (*cp != '\n')) ||
		    (val < 0) || (val >= rport->dev_loss_tmo))
			return -EINVAL;
		rport->fast_io_fail_tmo = val;
	}
	return count;
}
static FC_CLASS_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
	show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
Linus Torvalds's avatar
Linus Torvalds committed
851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935


/*
 * FC SCSI Target Attribute Management
 */

/*
 * Note: in the target show function we recognize when the remote
 *  port is in the heirarchy and do not allow the driver to get
 *  involved in sysfs functions. The driver only gets involved if
 *  it's the "old" style that doesn't use rports.
 */
#define fc_starget_show_function(field, format_string, sz, cast)	\
static ssize_t								\
show_fc_starget_##field (struct class_device *cdev, char *buf)		\
{									\
	struct scsi_target *starget = transport_class_to_starget(cdev);	\
	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);	\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
	struct fc_rport *rport = starget_to_rport(starget);		\
	if (rport)							\
		fc_starget_##field(starget) = rport->field;		\
	else if (i->f->get_starget_##field)				\
		i->f->get_starget_##field(starget);			\
	return snprintf(buf, sz, format_string, 			\
		cast fc_starget_##field(starget)); 			\
}

#define fc_starget_rd_attr(field, format_string, sz)			\
	fc_starget_show_function(field, format_string, sz, )		\
static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,			\
			 show_fc_starget_##field, NULL)

#define fc_starget_rd_attr_cast(field, format_string, sz, cast)		\
	fc_starget_show_function(field, format_string, sz, (cast))	\
static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,			\
			  show_fc_starget_##field, NULL)

#define SETUP_STARGET_ATTRIBUTE_RD(field)				\
	i->private_starget_attrs[count] = class_device_attr_starget_##field; \
	i->private_starget_attrs[count].attr.mode = S_IRUGO;		\
	i->private_starget_attrs[count].store = NULL;			\
	i->starget_attrs[count] = &i->private_starget_attrs[count];	\
	if (i->f->show_starget_##field)					\
		count++

#define SETUP_STARGET_ATTRIBUTE_RW(field)				\
	i->private_starget_attrs[count] = class_device_attr_starget_##field; \
	if (!i->f->set_starget_##field) {				\
		i->private_starget_attrs[count].attr.mode = S_IRUGO;	\
		i->private_starget_attrs[count].store = NULL;		\
	}								\
	i->starget_attrs[count] = &i->private_starget_attrs[count];	\
	if (i->f->show_starget_##field)					\
		count++

/* The FC Transport SCSI Target Attributes: */
fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
fc_starget_rd_attr(port_id, "0x%06x\n", 20);


/*
 * Host Attribute Management
 */

#define fc_host_show_function(field, format_string, sz, cast)		\
static ssize_t								\
show_fc_host_##field (struct class_device *cdev, char *buf)		\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
	if (i->f->get_host_##field)					\
		i->f->get_host_##field(shost);				\
	return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
}

#define fc_host_store_function(field)					\
static ssize_t								\
store_fc_host_##field(struct class_device *cdev, const char *buf,	\
			   size_t count)				\
{									\
	int val;							\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
936
	char *cp;							\
Linus Torvalds's avatar
Linus Torvalds committed
937
									\
938 939 940
	val = simple_strtoul(buf, &cp, 0);				\
	if (*cp && (*cp != '\n'))					\
		return -EINVAL;						\
Linus Torvalds's avatar
Linus Torvalds committed
941 942 943 944
	i->f->set_host_##field(shost, val);				\
	return count;							\
}

945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
#define fc_host_store_str_function(field, slen)				\
static ssize_t								\
store_fc_host_##field(struct class_device *cdev, const char *buf,	\
			   size_t count)				\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
	unsigned int cnt=count;						\
									\
	/* count may include a LF at end of string */			\
	if (buf[cnt-1] == '\n')						\
		cnt--;							\
	if (cnt > ((slen) - 1))						\
		return -EINVAL;						\
	memcpy(fc_host_##field(shost), buf, cnt);			\
	i->f->set_host_##field(shost);					\
	return count;							\
}

Linus Torvalds's avatar
Linus Torvalds committed
964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
#define fc_host_rd_attr(field, format_string, sz)			\
	fc_host_show_function(field, format_string, sz, )		\
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,			\
			 show_fc_host_##field, NULL)

#define fc_host_rd_attr_cast(field, format_string, sz, cast)		\
	fc_host_show_function(field, format_string, sz, (cast))		\
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,			\
			  show_fc_host_##field, NULL)

#define fc_host_rw_attr(field, format_string, sz)			\
	fc_host_show_function(field, format_string, sz, )		\
	fc_host_store_function(field)					\
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,		\
			show_fc_host_##field,				\
			store_fc_host_##field)

#define fc_host_rd_enum_attr(title, maxlen)				\
static ssize_t								\
show_fc_host_##title (struct class_device *cdev, char *buf)		\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
	const char *name;						\
	if (i->f->get_host_##title)					\
		i->f->get_host_##title(shost);				\
	name = get_fc_##title##_name(fc_host_##title(shost));		\
	if (!name)							\
		return -EINVAL;						\
	return snprintf(buf, maxlen, "%s\n", name);			\
}									\
static FC_CLASS_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)

#define SETUP_HOST_ATTRIBUTE_RD(field)					\
	i->private_host_attrs[count] = class_device_attr_host_##field;	\
	i->private_host_attrs[count].attr.mode = S_IRUGO;		\
	i->private_host_attrs[count].store = NULL;			\
	i->host_attrs[count] = &i->private_host_attrs[count];		\
	if (i->f->show_host_##field)					\
		count++

#define SETUP_HOST_ATTRIBUTE_RW(field)					\
	i->private_host_attrs[count] = class_device_attr_host_##field;	\
	if (!i->f->set_host_##field) {					\
		i->private_host_attrs[count].attr.mode = S_IRUGO;	\
		i->private_host_attrs[count].store = NULL;		\
	}								\
	i->host_attrs[count] = &i->private_host_attrs[count];		\
	if (i->f->show_host_##field)					\
		count++


#define fc_private_host_show_function(field, format_string, sz, cast)	\
static ssize_t								\
show_fc_host_##field (struct class_device *cdev, char *buf)		\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
}

#define fc_private_host_rd_attr(field, format_string, sz)		\
	fc_private_host_show_function(field, format_string, sz, )	\
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,			\
			 show_fc_host_##field, NULL)

#define fc_private_host_rd_attr_cast(field, format_string, sz, cast)	\
	fc_private_host_show_function(field, format_string, sz, (cast)) \
static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,			\
			  show_fc_host_##field, NULL)

#define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)			\
	i->private_host_attrs[count] = class_device_attr_host_##field;	\
	i->private_host_attrs[count].attr.mode = S_IRUGO;		\
	i->private_host_attrs[count].store = NULL;			\
	i->host_attrs[count] = &i->private_host_attrs[count];		\
	count++

#define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)			\
1042
{									\
Linus Torvalds's avatar
Linus Torvalds committed
1043 1044
	i->private_host_attrs[count] = class_device_attr_host_##field;	\
	i->host_attrs[count] = &i->private_host_attrs[count];		\
1045 1046
	count++;							\
}
Linus Torvalds's avatar
Linus Torvalds committed
1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088


/* Fixed Host Attributes */

static ssize_t
show_fc_host_supported_classes (struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);

	if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
		return snprintf(buf, 20, "unspecified\n");

	return get_fc_cos_names(fc_host_supported_classes(shost), buf);
}
static FC_CLASS_DEVICE_ATTR(host, supported_classes, S_IRUGO,
		show_fc_host_supported_classes, NULL);

static ssize_t
show_fc_host_supported_fc4s (struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
}
static FC_CLASS_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
		show_fc_host_supported_fc4s, NULL);

static ssize_t
show_fc_host_supported_speeds (struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);

	if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
		return snprintf(buf, 20, "unknown\n");

	return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
}
static FC_CLASS_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
		show_fc_host_supported_speeds, NULL);


fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1089 1090
fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
			     unsigned long long);
Linus Torvalds's avatar
Linus Torvalds committed
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));


/* Dynamic Host Attributes */

static ssize_t
show_fc_host_active_fc4s (struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	struct fc_internal *i = to_fc_internal(shost->transportt);

	if (i->f->get_host_active_fc4s)
		i->f->get_host_active_fc4s(shost);

	return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
}
static FC_CLASS_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
		show_fc_host_active_fc4s, NULL);

static ssize_t
show_fc_host_speed (struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	struct fc_internal *i = to_fc_internal(shost->transportt);

	if (i->f->get_host_speed)
		i->f->get_host_speed(shost);

	if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
		return snprintf(buf, 20, "unknown\n");

	return get_fc_port_speed_names(fc_host_speed(shost), buf);
}
static FC_CLASS_DEVICE_ATTR(host, speed, S_IRUGO,
		show_fc_host_speed, NULL);


fc_host_rd_attr(port_id, "0x%06x\n", 20);
fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1133
fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
Linus Torvalds's avatar
Linus Torvalds committed
1134

1135 1136 1137 1138 1139 1140
fc_private_host_show_function(system_hostname, "%s\n",
		FC_SYMBOLIC_NAME_SIZE + 1, )
fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
static FC_CLASS_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
		show_fc_host_system_hostname, store_fc_host_system_hostname);

Linus Torvalds's avatar
Linus Torvalds committed
1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155

/* Private Host Attributes */

static ssize_t
show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	const char *name;

	name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
	if (!name)
		return -EINVAL;
	return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
}

1156 1157 1158
#define get_list_head_entry(pos, head, member) 		\
	pos = list_entry((head)->next, typeof(*pos), member)

Linus Torvalds's avatar
Linus Torvalds committed
1159 1160 1161 1162 1163
static ssize_t
store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
	const char *buf, size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
1164
	struct fc_rport *rport;
Linus Torvalds's avatar
Linus Torvalds committed
1165 1166 1167 1168 1169 1170 1171 1172 1173
 	enum fc_tgtid_binding_type val;
	unsigned long flags;

	if (get_fc_tgtid_bind_type_match(buf, &val))
		return -EINVAL;

	/* if changing bind type, purge all unused consistent bindings */
	if (val != fc_host_tgtid_bind_type(shost)) {
		spin_lock_irqsave(shost->host_lock, flags);
1174 1175 1176
		while (!list_empty(&fc_host_rport_bindings(shost))) {
			get_list_head_entry(rport,
				&fc_host_rport_bindings(shost), peers);
1177 1178 1179
			list_del(&rport->peers);
			rport->port_state = FC_PORTSTATE_DELETED;
			fc_queue_work(shost, &rport->rport_delete_work);
1180
		}
Linus Torvalds's avatar
Linus Torvalds committed
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191
		spin_unlock_irqrestore(shost->host_lock, flags);
	}

	fc_host_tgtid_bind_type(shost) = val;
	return count;
}

static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
			show_fc_private_host_tgtid_bind_type,
			store_fc_private_host_tgtid_bind_type);

1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211
static ssize_t
store_fc_private_host_issue_lip(struct class_device *cdev,
	const char *buf, size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	struct fc_internal *i = to_fc_internal(shost->transportt);
	int ret;

	/* ignore any data value written to the attribute */
	if (i->f->issue_fc_host_lip) {
		ret = i->f->issue_fc_host_lip(shost);
		return ret ? ret: count;
	}

	return -ENOENT;
}

static FC_CLASS_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
			store_fc_private_host_issue_lip);

Linus Torvalds's avatar
Linus Torvalds committed
1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387
/*
 * Host Statistics Management
 */

/* Show a given an attribute in the statistics group */
static ssize_t
fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	struct fc_internal *i = to_fc_internal(shost->transportt);
	struct fc_host_statistics *stats;
	ssize_t ret = -ENOENT;

	if (offset > sizeof(struct fc_host_statistics) ||
	    offset % sizeof(u64) != 0)
		WARN_ON(1);

	if (i->f->get_fc_host_stats) {
		stats = (i->f->get_fc_host_stats)(shost);
		if (stats)
			ret = snprintf(buf, 20, "0x%llx\n",
			      (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
	}
	return ret;
}


/* generate a read-only statistics attribute */
#define fc_host_statistic(name)						\
static ssize_t show_fcstat_##name(struct class_device *cd, char *buf) 	\
{									\
	return fc_stat_show(cd, buf, 					\
			    offsetof(struct fc_host_statistics, name));	\
}									\
static FC_CLASS_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)

fc_host_statistic(seconds_since_last_reset);
fc_host_statistic(tx_frames);
fc_host_statistic(tx_words);
fc_host_statistic(rx_frames);
fc_host_statistic(rx_words);
fc_host_statistic(lip_count);
fc_host_statistic(nos_count);
fc_host_statistic(error_frames);
fc_host_statistic(dumped_frames);
fc_host_statistic(link_failure_count);
fc_host_statistic(loss_of_sync_count);
fc_host_statistic(loss_of_signal_count);
fc_host_statistic(prim_seq_protocol_err_count);
fc_host_statistic(invalid_tx_word_count);
fc_host_statistic(invalid_crc_count);
fc_host_statistic(fcp_input_requests);
fc_host_statistic(fcp_output_requests);
fc_host_statistic(fcp_control_requests);
fc_host_statistic(fcp_input_megabytes);
fc_host_statistic(fcp_output_megabytes);

static ssize_t
fc_reset_statistics(struct class_device *cdev, const char *buf,
			   size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	struct fc_internal *i = to_fc_internal(shost->transportt);

	/* ignore any data value written to the attribute */
	if (i->f->reset_fc_host_stats) {
		i->f->reset_fc_host_stats(shost);
		return count;
	}

	return -ENOENT;
}
static FC_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
				fc_reset_statistics);


static struct attribute *fc_statistics_attrs[] = {
	&class_device_attr_host_seconds_since_last_reset.attr,
	&class_device_attr_host_tx_frames.attr,
	&class_device_attr_host_tx_words.attr,
	&class_device_attr_host_rx_frames.attr,
	&class_device_attr_host_rx_words.attr,
	&class_device_attr_host_lip_count.attr,
	&class_device_attr_host_nos_count.attr,
	&class_device_attr_host_error_frames.attr,
	&class_device_attr_host_dumped_frames.attr,
	&class_device_attr_host_link_failure_count.attr,
	&class_device_attr_host_loss_of_sync_count.attr,
	&class_device_attr_host_loss_of_signal_count.attr,
	&class_device_attr_host_prim_seq_protocol_err_count.attr,
	&class_device_attr_host_invalid_tx_word_count.attr,
	&class_device_attr_host_invalid_crc_count.attr,
	&class_device_attr_host_fcp_input_requests.attr,
	&class_device_attr_host_fcp_output_requests.attr,
	&class_device_attr_host_fcp_control_requests.attr,
	&class_device_attr_host_fcp_input_megabytes.attr,
	&class_device_attr_host_fcp_output_megabytes.attr,
	&class_device_attr_host_reset_statistics.attr,
	NULL
};

static struct attribute_group fc_statistics_group = {
	.name = "statistics",
	.attrs = fc_statistics_attrs,
};

static int fc_host_match(struct attribute_container *cont,
			  struct device *dev)
{
	struct Scsi_Host *shost;
	struct fc_internal *i;

	if (!scsi_is_host_device(dev))
		return 0;

	shost = dev_to_shost(dev);
	if (!shost->transportt  || shost->transportt->host_attrs.ac.class
	    != &fc_host_class.class)
		return 0;

	i = to_fc_internal(shost->transportt);

	return &i->t.host_attrs.ac == cont;
}

static int fc_target_match(struct attribute_container *cont,
			    struct device *dev)
{
	struct Scsi_Host *shost;
	struct fc_internal *i;

	if (!scsi_is_target_device(dev))
		return 0;

	shost = dev_to_shost(dev->parent);
	if (!shost->transportt  || shost->transportt->host_attrs.ac.class
	    != &fc_host_class.class)
		return 0;

	i = to_fc_internal(shost->transportt);

	return &i->t.target_attrs.ac == cont;
}

static void fc_rport_dev_release(struct device *dev)
{
	struct fc_rport *rport = dev_to_rport(dev);
	put_device(dev->parent);
	kfree(rport);
}

int scsi_is_fc_rport(const struct device *dev)
{
	return dev->release == fc_rport_dev_release;
}
EXPORT_SYMBOL(scsi_is_fc_rport);

static int fc_rport_match(struct attribute_container *cont,
			    struct device *dev)
{
	struct Scsi_Host *shost;
	struct fc_internal *i;

	if (!scsi_is_fc_rport(dev))
		return 0;

	shost = dev_to_shost(dev->parent);
	if (!shost->transportt  || shost->transportt->host_attrs.ac.class
	    != &fc_host_class.class)
		return 0;

	i = to_fc_internal(shost->transportt);

	return &i->rport_attr_cont.ac == cont;
}

1388

1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422
/**
 * fc_timed_out - FC Transport I/O timeout intercept handler
 *
 * @scmd:	The SCSI command which timed out
 *
 * This routine protects against error handlers getting invoked while a
 * rport is in a blocked state, typically due to a temporarily loss of
 * connectivity. If the error handlers are allowed to proceed, requests
 * to abort i/o, reset the target, etc will likely fail as there is no way
 * to communicate with the device to perform the requested function. These
 * failures may result in the midlayer taking the device offline, requiring
 * manual intervention to restore operation.
 *
 * This routine, called whenever an i/o times out, validates the state of
 * the underlying rport. If the rport is blocked, it returns
 * EH_RESET_TIMER, which will continue to reschedule the timeout.
 * Eventually, either the device will return, or devloss_tmo will fire,
 * and when the timeout then fires, it will be handled normally.
 * If the rport is not blocked, normal error handling continues.
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
static enum scsi_eh_timer_return
fc_timed_out(struct scsi_cmnd *scmd)
{
	struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));

	if (rport->port_state == FC_PORTSTATE_BLOCKED)
		return EH_RESET_TIMER;

	return EH_NOT_HANDLED;
}

1423 1424 1425
/*
 * Must be called with shost->host_lock held
 */
1426 1427
static int fc_user_scan(struct Scsi_Host *shost, uint channel,
		uint id, uint lun)
1428 1429 1430
{
	struct fc_rport *rport;

1431 1432 1433
	list_for_each_entry(rport, &fc_host_rports(shost), peers) {
		if (rport->scsi_target_id == -1)
			continue;
1434

1435 1436 1437 1438 1439 1440 1441 1442
		if ((channel == SCAN_WILD_CARD || channel == rport->channel) &&
		    (id == SCAN_WILD_CARD || id == rport->scsi_target_id)) {
			scsi_scan_target(&rport->dev, rport->channel,
					 rport->scsi_target_id, lun, 1);
		}
	}

	return 0;
1443 1444
}

Linus Torvalds's avatar
Linus Torvalds committed
1445 1446 1447 1448
struct scsi_transport_template *
fc_attach_transport(struct fc_function_template *ft)
{
	int count;
1449 1450
	struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
					GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477

	if (unlikely(!i))
		return NULL;

	i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
	i->t.target_attrs.ac.class = &fc_transport_class.class;
	i->t.target_attrs.ac.match = fc_target_match;
	i->t.target_size = sizeof(struct fc_starget_attrs);
	transport_container_register(&i->t.target_attrs);

	i->t.host_attrs.ac.attrs = &i->host_attrs[0];
	i->t.host_attrs.ac.class = &fc_host_class.class;
	i->t.host_attrs.ac.match = fc_host_match;
	i->t.host_size = sizeof(struct fc_host_attrs);
	if (ft->get_fc_host_stats)
		i->t.host_attrs.statistics = &fc_statistics_group;
	transport_container_register(&i->t.host_attrs);

	i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
	i->rport_attr_cont.ac.class = &fc_rport_class.class;
	i->rport_attr_cont.ac.match = fc_rport_match;
	transport_container_register(&i->rport_attr_cont);

	i->f = ft;

	/* Transport uses the shost workq for scsi scanning */
	i->t.create_work_queue = 1;
1478

1479 1480
	i->t.eh_timed_out = fc_timed_out;

1481
	i->t.user_scan = fc_user_scan;
Linus Torvalds's avatar
Linus Torvalds committed
1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501
	
	/*
	 * Setup SCSI Target Attributes.
	 */
	count = 0;
	SETUP_STARGET_ATTRIBUTE_RD(node_name);
	SETUP_STARGET_ATTRIBUTE_RD(port_name);
	SETUP_STARGET_ATTRIBUTE_RD(port_id);

	BUG_ON(count > FC_STARGET_NUM_ATTRS);

	i->starget_attrs[count] = NULL;


	/*
	 * Setup SCSI Host Attributes.
	 */
	count=0;
	SETUP_HOST_ATTRIBUTE_RD(node_name);
	SETUP_HOST_ATTRIBUTE_RD(port_name);
1502
	SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
Linus Torvalds's avatar
Linus Torvalds committed
1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514
	SETUP_HOST_ATTRIBUTE_RD(supported_classes);
	SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
	SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
	SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
	SETUP_HOST_ATTRIBUTE_RD(serial_number);

	SETUP_HOST_ATTRIBUTE_RD(port_id);
	SETUP_HOST_ATTRIBUTE_RD(port_type);
	SETUP_HOST_ATTRIBUTE_RD(port_state);
	SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
	SETUP_HOST_ATTRIBUTE_RD(speed);
	SETUP_HOST_ATTRIBUTE_RD(fabric_name);
1515
	SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
1516
	SETUP_HOST_ATTRIBUTE_RW(system_hostname);
Linus Torvalds's avatar
Linus Torvalds committed
1517 1518 1519

	/* Transport-managed attributes */
	SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
1520 1521
	if (ft->issue_fc_host_lip)
		SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
Linus Torvalds's avatar
Linus Torvalds committed
1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539

	BUG_ON(count > FC_HOST_NUM_ATTRS);

	i->host_attrs[count] = NULL;

	/*
	 * Setup Remote Port Attributes.
	 */
	count=0;
	SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
	SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
	SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
1540 1541
	if (ft->terminate_rport_io)
		SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
Linus Torvalds's avatar
Linus Torvalds committed
1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562

	BUG_ON(count > FC_RPORT_NUM_ATTRS);

	i->rport_attrs[count] = NULL;

	return &i->t;
}
EXPORT_SYMBOL(fc_attach_transport);

void fc_release_transport(struct scsi_transport_template *t)
{
	struct fc_internal *i = to_fc_internal(t);

	transport_container_unregister(&i->t.target_attrs);
	transport_container_unregister(&i->t.host_attrs);
	transport_container_unregister(&i->rport_attr_cont);

	kfree(i);
}
EXPORT_SYMBOL(fc_release_transport);

1563 1564 1565 1566 1567 1568
/**
 * fc_queue_work - Queue work to the fc_host workqueue.
 * @shost:	Pointer to Scsi_Host bound to fc_host.
 * @work:	Work to queue for execution.
 *
 * Return value:
1569 1570 1571
 * 	1 - work queued for execution
 *	0 - work is already queued
 *	-EINVAL - work queue doesn't exist
1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612
 **/
static int
fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
{
	if (unlikely(!fc_host_work_q(shost))) {
		printk(KERN_ERR
			"ERROR: FC host '%s' attempted to queue work, "
			"when no workqueue created.\n", shost->hostt->name);
		dump_stack();

		return -EINVAL;
	}

	return queue_work(fc_host_work_q(shost), work);
}

/**
 * fc_flush_work - Flush a fc_host's workqueue.
 * @shost:	Pointer to Scsi_Host bound to fc_host.
 **/
static void
fc_flush_work(struct Scsi_Host *shost)
{
	if (!fc_host_work_q(shost)) {
		printk(KERN_ERR
			"ERROR: FC host '%s' attempted to flush work, "
			"when no workqueue created.\n", shost->hostt->name);
		dump_stack();
		return;
	}

	flush_workqueue(fc_host_work_q(shost));
}

/**
 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
 * @shost:	Pointer to Scsi_Host bound to fc_host.
 * @work:	Work to queue for execution.
 * @delay:	jiffies to delay the work queuing
 *
 * Return value:
1613
 * 	1 on success / 0 already queued / < 0 for error
1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627
 **/
static int
fc_queue_devloss_work(struct Scsi_Host *shost, struct work_struct *work,
				unsigned long delay)
{
	if (unlikely(!fc_host_devloss_work_q(shost))) {
		printk(KERN_ERR
			"ERROR: FC host '%s' attempted to queue work, "
			"when no workqueue created.\n", shost->hostt->name);
		dump_stack();

		return -EINVAL;
	}

1628 1629 1630
	if (delay == 0)
		return queue_work(fc_host_devloss_work_q(shost), work);

1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
	return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
}

/**
 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
 * @shost:	Pointer to Scsi_Host bound to fc_host.
 **/
static void
fc_flush_devloss(struct Scsi_Host *shost)
{
	if (!fc_host_devloss_work_q(shost)) {
		printk(KERN_ERR
			"ERROR: FC host '%s' attempted to flush work, "
			"when no workqueue created.\n", shost->hostt->name);
		dump_stack();
		return;
	}

	flush_workqueue(fc_host_devloss_work_q(shost));
}

Linus Torvalds's avatar
Linus Torvalds committed
1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672

/**
 * fc_remove_host - called to terminate any fc_transport-related elements
 *                  for a scsi host.
 * @rport:	remote port to be unblocked.
 *
 * This routine is expected to be called immediately preceeding the
 * a driver's call to scsi_remove_host().
 *
 * WARNING: A driver utilizing the fc_transport, which fails to call
 *   this routine prior to scsi_remote_host(), will leave dangling
 *   objects in /sys/class/fc_remote_ports. Access to any of these
 *   objects can result in a system crash !!!
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
void
fc_remove_host(struct Scsi_Host *shost)
{
	struct fc_rport *rport, *next_rport;
1673 1674
	struct workqueue_struct *work_q;
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
Linus Torvalds's avatar
Linus Torvalds committed
1675 1676 1677

	/* Remove any remote ports */
	list_for_each_entry_safe(rport, next_rport,
1678 1679 1680 1681 1682 1683
			&fc_host->rports, peers) {
		list_del(&rport->peers);
		rport->port_state = FC_PORTSTATE_DELETED;
		fc_queue_work(shost, &rport->rport_delete_work);
	}

Linus Torvalds's avatar
Linus Torvalds committed
1684
	list_for_each_entry_safe(rport, next_rport,
1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706
			&fc_host->rport_bindings, peers) {
		list_del(&rport->peers);
		rport->port_state = FC_PORTSTATE_DELETED;
		fc_queue_work(shost, &rport->rport_delete_work);
	}

	/* flush all scan work items */
	scsi_flush_work(shost);

	/* flush all stgt delete, and rport delete work items, then kill it  */
	if (fc_host->work_q) {
		work_q = fc_host->work_q;
		fc_host->work_q = NULL;
		destroy_workqueue(work_q);
	}

	/* flush all devloss work items, then kill it  */
	if (fc_host->devloss_work_q) {
		work_q = fc_host->devloss_work_q;
		fc_host->devloss_work_q = NULL;
		destroy_workqueue(work_q);
	}
Linus Torvalds's avatar
Linus Torvalds committed
1707 1708 1709
}
EXPORT_SYMBOL(fc_remove_host);

1710 1711 1712 1713 1714 1715 1716

/**
 * fc_starget_delete - called to delete the scsi decendents of an rport
 *                  (target and all sdevs)
 *
 * @data:	remote port to be operated on.
 **/
1717
static void
1718
fc_starget_delete(void *data)
1719
{
1720
	struct fc_rport *rport = (struct fc_rport *)data;
1721
	struct Scsi_Host *shost = rport_to_shost(rport);
1722
	unsigned long flags;
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733
	struct fc_internal *i = to_fc_internal(shost->transportt);

	/*
	 * Involve the LLDD if possible. All io on the rport is to
	 * be terminated, either as part of the dev_loss_tmo callback
	 * processing, or via the terminate_rport_io function.
	 */
	if (i->f->dev_loss_tmo_callbk)
		i->f->dev_loss_tmo_callbk(rport);
	else if (i->f->terminate_rport_io)
		i->f->terminate_rport_io(rport);
1734

1735 1736 1737
	spin_lock_irqsave(shost->host_lock, flags);
	if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
		spin_unlock_irqrestore(shost->host_lock, flags);
1738 1739
		if (!cancel_delayed_work(&rport->fail_io_work))
			fc_flush_devloss(shost);
1740 1741 1742 1743 1744 1745
		if (!cancel_delayed_work(&rport->dev_loss_work))
			fc_flush_devloss(shost);
		spin_lock_irqsave(shost->host_lock, flags);
		rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
	}
	spin_unlock_irqrestore(shost->host_lock, flags);
1746 1747 1748 1749

	scsi_remove_target(&rport->dev);
}

1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761

/**
 * fc_rport_final_delete - finish rport termination and delete it.
 *
 * @data:	remote port to be deleted.
 **/
static void
fc_rport_final_delete(void *data)
{
	struct fc_rport *rport = (struct fc_rport *)data;
	struct device *dev = &rport->dev;
	struct Scsi_Host *shost = rport_to_shost(rport);
1762
	struct fc_internal *i = to_fc_internal(shost->transportt);
1763 1764 1765 1766 1767 1768 1769 1770

	/*
	 * if a scan is pending, flush the SCSI Host work_q so that 
	 * that we can reclaim the rport scan work element.
	 */
	if (rport->flags & FC_RPORT_SCAN_PENDING)
		scsi_flush_work(shost);

1771 1772 1773 1774 1775 1776 1777 1778
	/* Delete SCSI target and sdevs */
	if (rport->scsi_target_id != -1)
		fc_starget_delete(data);
	else if (i->f->dev_loss_tmo_callbk)
		i->f->dev_loss_tmo_callbk(rport);
	else if (i->f->terminate_rport_io)
		i->f->terminate_rport_io(rport);

1779 1780 1781
	transport_remove_device(dev);
	device_del(dev);
	transport_destroy_device(dev);
1782 1783
	put_device(&shost->shost_gendev);	/* for fc_host->rport list */
	put_device(dev);			/* for self-reference */
1784 1785 1786
}


Linus Torvalds's avatar
Linus Torvalds committed
1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803
/**
 * fc_rport_create - allocates and creates a remote FC port.
 * @shost:	scsi host the remote port is connected to.
 * @channel:	Channel on shost port connected to.
 * @ids:	The world wide names, fc address, and FC4 port
 *		roles for the remote port.
 *
 * Allocates and creates the remoter port structure, including the
 * class and sysfs creation.
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
struct fc_rport *
fc_rport_create(struct Scsi_Host *shost, int channel,
	struct fc_rport_identifiers  *ids)
{
1804
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
Linus Torvalds's avatar
Linus Torvalds committed
1805 1806 1807 1808 1809 1810 1811 1812
	struct fc_internal *fci = to_fc_internal(shost->transportt);
	struct fc_rport *rport;
	struct device *dev;
	unsigned long flags;
	int error;
	size_t size;

	size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
1813
	rport = kzalloc(size, GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829
	if (unlikely(!rport)) {
		printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
		return NULL;
	}

	rport->maxframe_size = -1;
	rport->supported_classes = FC_COS_UNSPECIFIED;
	rport->dev_loss_tmo = fc_dev_loss_tmo;
	memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
	memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
	rport->port_id = ids->port_id;
	rport->roles = ids->roles;
	rport->port_state = FC_PORTSTATE_ONLINE;
	if (fci->f->dd_fcrport_size)
		rport->dd_data = &rport[1];
	rport->channel = channel;
1830
	rport->fast_io_fail_tmo = -1;
Linus Torvalds's avatar
Linus Torvalds committed
1831

1832
	INIT_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport, rport);
1833
	INIT_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io, rport);
Linus Torvalds's avatar
Linus Torvalds committed
1834
	INIT_WORK(&rport->scan_work, fc_scsi_scan_rport, rport);
1835 1836
	INIT_WORK(&rport->stgt_delete_work, fc_starget_delete, rport);
	INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete, rport);
Linus Torvalds's avatar
Linus Torvalds committed
1837 1838 1839 1840 1841 1842 1843 1844

	spin_lock_irqsave(shost->host_lock, flags);

	rport->number = fc_host->next_rport_number++;
	if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
		rport->scsi_target_id = fc_host->next_target_id++;
	else
		rport->scsi_target_id = -1;
1845
	list_add_tail(&rport->peers, &fc_host->rports);
1846
	get_device(&shost->shost_gendev);	/* for fc_host->rport list */
Linus Torvalds's avatar
Linus Torvalds committed
1847 1848 1849 1850

	spin_unlock_irqrestore(shost->host_lock, flags);

	dev = &rport->dev;
1851 1852
	device_initialize(dev);			/* takes self reference */
	dev->parent = get_device(&shost->shost_gendev); /* parent reference */
Linus Torvalds's avatar
Linus Torvalds committed
1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865
	dev->release = fc_rport_dev_release;
	sprintf(dev->bus_id, "rport-%d:%d-%d",
		shost->host_no, channel, rport->number);
	transport_setup_device(dev);

	error = device_add(dev);
	if (error) {
		printk(KERN_ERR "FC Remote Port device_add failed\n");
		goto delete_rport;
	}
	transport_add_device(dev);
	transport_configure_device(dev);

1866
	if (rport->roles & FC_RPORT_ROLE_FCP_TARGET) {
Linus Torvalds's avatar
Linus Torvalds committed
1867
		/* initiate a scan of the target */
1868
		rport->flags |= FC_RPORT_SCAN_PENDING;
Linus Torvalds's avatar
Linus Torvalds committed
1869
		scsi_queue_work(shost, &rport->scan_work);
1870
	}
Linus Torvalds's avatar
Linus Torvalds committed
1871 1872 1873 1874 1875 1876 1877

	return rport;

delete_rport:
	transport_destroy_device(dev);
	spin_lock_irqsave(shost->host_lock, flags);
	list_del(&rport->peers);
1878
	put_device(&shost->shost_gendev);	/* for fc_host->rport list */
Linus Torvalds's avatar
Linus Torvalds committed
1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927
	spin_unlock_irqrestore(shost->host_lock, flags);
	put_device(dev->parent);
	kfree(rport);
	return NULL;
}

/**
 * fc_remote_port_add - notifies the fc transport of the existence
 *		of a remote FC port.
 * @shost:	scsi host the remote port is connected to.
 * @channel:	Channel on shost port connected to.
 * @ids:	The world wide names, fc address, and FC4 port
 *		roles for the remote port.
 *
 * The LLDD calls this routine to notify the transport of the existence
 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
 * of the port, it's FC address (port_id), and the FC4 roles that are
 * active for the port.
 *
 * For ports that are FCP targets (aka scsi targets), the FC transport
 * maintains consistent target id bindings on behalf of the LLDD.
 * A consistent target id binding is an assignment of a target id to
 * a remote port identifier, which persists while the scsi host is
 * attached. The remote port can disappear, then later reappear, and
 * it's target id assignment remains the same. This allows for shifts
 * in FC addressing (if binding by wwpn or wwnn) with no apparent
 * changes to the scsi subsystem which is based on scsi host number and
 * target id values.  Bindings are only valid during the attachment of
 * the scsi host. If the host detaches, then later re-attaches, target
 * id bindings may change.
 *
 * This routine is responsible for returning a remote port structure.
 * The routine will search the list of remote ports it maintains
 * internally on behalf of consistent target id mappings. If found, the
 * remote port structure will be reused. Otherwise, a new remote port
 * structure will be allocated.
 *
 * Whenever a remote port is allocated, a new fc_remote_port class
 * device is created.
 *
 * Should not be called from interrupt context.
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
struct fc_rport *
fc_remote_port_add(struct Scsi_Host *shost, int channel,
	struct fc_rport_identifiers  *ids)
{
1928
	struct fc_internal *fci = to_fc_internal(shost->transportt);
1929
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
Linus Torvalds's avatar
Linus Torvalds committed
1930 1931 1932 1933
	struct fc_rport *rport;
	unsigned long flags;
	int match = 0;

1934 1935 1936
	/* ensure any stgt delete functions are done */
	fc_flush_work(shost);

1937 1938 1939 1940 1941 1942 1943
	/*
	 * Search the list of "active" rports, for an rport that has been
	 * deleted, but we've held off the real delete while the target
	 * is in a "blocked" state.
	 */
	spin_lock_irqsave(shost->host_lock, flags);

1944
	list_for_each_entry(rport, &fc_host->rports, peers) {
1945 1946 1947 1948

		if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
			(rport->channel == channel)) {

1949
			switch (fc_host->tgtid_bind_type) {
1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996
			case FC_TGTID_BIND_BY_WWPN:
			case FC_TGTID_BIND_NONE:
				if (rport->port_name == ids->port_name)
					match = 1;
				break;
			case FC_TGTID_BIND_BY_WWNN:
				if (rport->node_name == ids->node_name)
					match = 1;
				break;
			case FC_TGTID_BIND_BY_ID:
				if (rport->port_id == ids->port_id)
					match = 1;
				break;
			}

			if (match) {
				struct work_struct *work = 
							&rport->dev_loss_work;

				memcpy(&rport->node_name, &ids->node_name,
					sizeof(rport->node_name));
				memcpy(&rport->port_name, &ids->port_name,
					sizeof(rport->port_name));
				rport->port_id = ids->port_id;

				rport->port_state = FC_PORTSTATE_ONLINE;
				rport->roles = ids->roles;

				spin_unlock_irqrestore(shost->host_lock, flags);

				if (fci->f->dd_fcrport_size)
					memset(rport->dd_data, 0,
						fci->f->dd_fcrport_size);

				/*
				 * If we were blocked, we were a target.
				 * If no longer a target, we leave the timer
				 * running in case the port changes roles
				 * prior to the timer expiring. If the timer
				 * fires, the target will be torn down.
				 */
				if (!(ids->roles & FC_RPORT_ROLE_FCP_TARGET))
					return rport;

				/* restart the target */

				/*
1997
				 * Stop the target timers first. Take no action
1998 1999 2000 2001
				 * on the del_timer failure as the state
				 * machine state change will validate the
				 * transaction.
				 */
2002 2003
				if (!cancel_delayed_work(&rport->fail_io_work))
					fc_flush_devloss(shost);
2004
				if (!cancel_delayed_work(work))
2005 2006 2007 2008 2009
					fc_flush_devloss(shost);

				spin_lock_irqsave(shost->host_lock, flags);

				rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2010 2011

				/* initiate a scan of the target */
2012
				rport->flags |= FC_RPORT_SCAN_PENDING;
2013 2014
				scsi_queue_work(shost, &rport->scan_work);

2015 2016
				spin_unlock_irqrestore(shost->host_lock, flags);

2017 2018
				scsi_target_unblock(&rport->dev);

2019 2020 2021 2022 2023 2024
				return rport;
			}
		}
	}

	/* Search the bindings array */
2025
	if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
Linus Torvalds's avatar
Linus Torvalds committed
2026 2027 2028

		/* search for a matching consistent binding */

2029
		list_for_each_entry(rport, &fc_host->rport_bindings,
Linus Torvalds's avatar
Linus Torvalds committed
2030 2031 2032 2033
					peers) {
			if (rport->channel != channel)
				continue;

2034
			switch (fc_host->tgtid_bind_type) {
Linus Torvalds's avatar
Linus Torvalds committed
2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051
			case FC_TGTID_BIND_BY_WWPN:
				if (rport->port_name == ids->port_name)
					match = 1;
				break;
			case FC_TGTID_BIND_BY_WWNN:
				if (rport->node_name == ids->node_name)
					match = 1;
				break;
			case FC_TGTID_BIND_BY_ID:
				if (rport->port_id == ids->port_id)
					match = 1;
				break;
			case FC_TGTID_BIND_NONE: /* to keep compiler happy */
				break;
			}

			if (match) {
2052
				list_move_tail(&rport->peers, &fc_host->rports);
Linus Torvalds's avatar
Linus Torvalds committed
2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065
				break;
			}
		}

		if (match) {
			memcpy(&rport->node_name, &ids->node_name,
				sizeof(rport->node_name));
			memcpy(&rport->port_name, &ids->port_name,
				sizeof(rport->port_name));
			rport->port_id = ids->port_id;
			rport->roles = ids->roles;
			rport->port_state = FC_PORTSTATE_ONLINE;

2066 2067 2068 2069
			if (fci->f->dd_fcrport_size)
				memset(rport->dd_data, 0,
						fci->f->dd_fcrport_size);

2070
			if (rport->roles & FC_RPORT_ROLE_FCP_TARGET) {
Linus Torvalds's avatar
Linus Torvalds committed
2071
				/* initiate a scan of the target */
2072
				rport->flags |= FC_RPORT_SCAN_PENDING;
Linus Torvalds's avatar
Linus Torvalds committed
2073
				scsi_queue_work(shost, &rport->scan_work);
2074 2075 2076 2077
				spin_unlock_irqrestore(shost->host_lock, flags);
				scsi_target_unblock(&rport->dev);
			} else
				spin_unlock_irqrestore(shost->host_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
2078 2079 2080 2081 2082

			return rport;
		}
	}

2083 2084
	spin_unlock_irqrestore(shost->host_lock, flags);

Linus Torvalds's avatar
Linus Torvalds committed
2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100
	/* No consistent binding found - create new remote port entry */
	rport = fc_rport_create(shost, channel, ids);

	return rport;
}
EXPORT_SYMBOL(fc_remote_port_add);


/**
 * fc_remote_port_delete - notifies the fc transport that a remote
 *		port is no longer in existence.
 * @rport:	The remote port that no longer exists
 *
 * The LLDD calls this routine to notify the transport that a remote
 * port is no longer part of the topology. Note: Although a port
 * may no longer be part of the topology, it may persist in the remote
2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111
 * ports displayed by the fc_host. We do this under 2 conditions:
 * - If the port was a scsi target, we delay its deletion by "blocking" it.
 *   This allows the port to temporarily disappear, then reappear without
 *   disrupting the SCSI device tree attached to it. During the "blocked"
 *   period the port will still exist.
 * - If the port was a scsi target and disappears for longer than we
 *   expect, we'll delete the port and the tear down the SCSI device tree
 *   attached to it. However, we want to semi-persist the target id assigned
 *   to that port if it eventually does exist. The port structure will
 *   remain (although with minimal information) so that the target id
 *   bindings remails.
Linus Torvalds's avatar
Linus Torvalds committed
2112 2113 2114 2115
 *
 * If the remote port is not an FCP Target, it will be fully torn down
 * and deallocated, including the fc_remote_port class device.
 *
2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129
 * If the remote port is an FCP Target, the port will be placed in a
 * temporary blocked state. From the LLDD's perspective, the rport no
 * longer exists. From the SCSI midlayer's perspective, the SCSI target
 * exists, but all sdevs on it are blocked from further I/O. The following
 * is then expected:
 *   If the remote port does not return (signaled by a LLDD call to
 *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
 *   scsi target is removed - killing all outstanding i/o and removing the
 *   scsi devices attached ot it. The port structure will be marked Not
 *   Present and be partially cleared, leaving only enough information to
 *   recognize the remote port relative to the scsi target id binding if
 *   it later appears.  The port will remain as long as there is a valid
 *   binding (e.g. until the user changes the binding type or unloads the
 *   scsi host with the binding).
Linus Torvalds's avatar
Linus Torvalds committed
2130
 *
2131 2132 2133 2134 2135 2136 2137 2138
 *   If the remote port returns within the dev_loss_tmo value (and matches
 *   according to the target id binding type), the port structure will be
 *   reused. If it is no longer a SCSI target, the target will be torn
 *   down. If it continues to be a SCSI target, then the target will be
 *   unblocked (allowing i/o to be resumed), and a scan will be activated
 *   to ensure that all luns are detected.
 *
 * Called from normal process context only - cannot be called from interrupt.
Linus Torvalds's avatar
Linus Torvalds committed
2139 2140 2141 2142 2143 2144 2145
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
void
fc_remote_port_delete(struct fc_rport  *rport)
{
2146
	struct Scsi_Host *shost = rport_to_shost(rport);
2147
	struct fc_internal *i = to_fc_internal(shost->transportt);
2148
	int timeout = rport->dev_loss_tmo;
2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159
	unsigned long flags;

	/*
	 * No need to flush the fc_host work_q's, as all adds are synchronous.
	 *
	 * We do need to reclaim the rport scan work element, so eventually
	 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
	 * there's still a scan pending.
	 */

	spin_lock_irqsave(shost->host_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
2160

2161 2162
	/* If no scsi target id mapping, delete it */
	if (rport->scsi_target_id == -1) {
2163 2164 2165 2166
		list_del(&rport->peers);
		rport->port_state = FC_PORTSTATE_DELETED;
		fc_queue_work(shost, &rport->rport_delete_work);
		spin_unlock_irqrestore(shost->host_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
2167 2168 2169
		return;
	}

2170 2171 2172 2173 2174 2175
	rport->port_state = FC_PORTSTATE_BLOCKED;

	rport->flags |= FC_RPORT_DEVLOSS_PENDING;

	spin_unlock_irqrestore(shost->host_lock, flags);