1 /*
2  * iSCSI transport class definitions
3  *
4  * Copyright (C) IBM Corporation, 2004
5  * Copyright (C) Mike Christie, 2004 - 2005
6  * Copyright (C) Dmitry Yusupov, 2004 - 2005
7  * Copyright (C) Alex Aizman, 2004 - 2005
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22  */
23 #include <linux/module.h>
24 #include <linux/mutex.h>
25 #include <linux/slab.h>
26 #include <linux/bsg-lib.h>
27 #include <linux/idr.h>
28 #include <net/tcp.h>
29 #include <scsi/scsi.h>
30 #include <scsi/scsi_host.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_transport.h>
33 #include <scsi/scsi_transport_iscsi.h>
34 #include <scsi/iscsi_if.h>
35 #include <scsi/scsi_cmnd.h>
36 #include <scsi/scsi_bsg_iscsi.h>
37 
38 #define ISCSI_TRANSPORT_VERSION "2.0-870"
39 
40 static int dbg_session;
41 module_param_named(debug_session, dbg_session, int,
42 		   S_IRUGO | S_IWUSR);
43 MODULE_PARM_DESC(debug_session,
44 		 "Turn on debugging for sessions in scsi_transport_iscsi "
45 		 "module. Set to 1 to turn on, and zero to turn off. Default "
46 		 "is off.");
47 
48 static int dbg_conn;
49 module_param_named(debug_conn, dbg_conn, int,
50 		   S_IRUGO | S_IWUSR);
51 MODULE_PARM_DESC(debug_conn,
52 		 "Turn on debugging for connections in scsi_transport_iscsi "
53 		 "module. Set to 1 to turn on, and zero to turn off. Default "
54 		 "is off.");
55 
56 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)		\
57 	do {								\
58 		if (dbg_session)					\
59 			iscsi_cls_session_printk(KERN_INFO, _session,	\
60 						 "%s: " dbg_fmt,	\
61 						 __func__, ##arg);	\
62 	} while (0);
63 
64 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)			\
65 	do {								\
66 		if (dbg_conn)						\
67 			iscsi_cls_conn_printk(KERN_INFO, _conn,		\
68 					      "%s: " dbg_fmt,		\
69 					      __func__, ##arg);	\
70 	} while (0);
71 
72 struct iscsi_internal {
73 	struct scsi_transport_template t;
74 	struct iscsi_transport *iscsi_transport;
75 	struct list_head list;
76 	struct device dev;
77 
78 	struct transport_container conn_cont;
79 	struct transport_container session_cont;
80 };
81 
82 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
83 static struct workqueue_struct *iscsi_eh_timer_workq;
84 
85 static DEFINE_IDA(iscsi_sess_ida);
86 /*
87  * list of registered transports and lock that must
88  * be held while accessing list. The iscsi_transport_lock must
89  * be acquired after the rx_queue_mutex.
90  */
91 static LIST_HEAD(iscsi_transports);
92 static DEFINE_SPINLOCK(iscsi_transport_lock);
93 
94 #define to_iscsi_internal(tmpl) \
95 	container_of(tmpl, struct iscsi_internal, t)
96 
97 #define dev_to_iscsi_internal(_dev) \
98 	container_of(_dev, struct iscsi_internal, dev)
99 
100 static void iscsi_transport_release(struct device *dev)
101 {
102 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
103 	kfree(priv);
104 }
105 
106 /*
107  * iscsi_transport_class represents the iscsi_transports that are
108  * registered.
109  */
110 static struct class iscsi_transport_class = {
111 	.name = "iscsi_transport",
112 	.dev_release = iscsi_transport_release,
113 };
114 
115 static ssize_t
116 show_transport_handle(struct device *dev, struct device_attribute *attr,
117 		      char *buf)
118 {
119 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
120 	return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
121 }
122 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
123 
124 #define show_transport_attr(name, format)				\
125 static ssize_t								\
126 show_transport_##name(struct device *dev, 				\
127 		      struct device_attribute *attr,char *buf)		\
128 {									\
129 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);	\
130 	return sprintf(buf, format"\n", priv->iscsi_transport->name);	\
131 }									\
132 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
133 
134 show_transport_attr(caps, "0x%x");
135 
136 static struct attribute *iscsi_transport_attrs[] = {
137 	&dev_attr_handle.attr,
138 	&dev_attr_caps.attr,
139 	NULL,
140 };
141 
142 static struct attribute_group iscsi_transport_group = {
143 	.attrs = iscsi_transport_attrs,
144 };
145 
146 /*
147  * iSCSI endpoint attrs
148  */
149 #define iscsi_dev_to_endpoint(_dev) \
150 	container_of(_dev, struct iscsi_endpoint, dev)
151 
152 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)	\
153 struct device_attribute dev_attr_##_prefix##_##_name =	\
154         __ATTR(_name,_mode,_show,_store)
155 
156 static void iscsi_endpoint_release(struct device *dev)
157 {
158 	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
159 	kfree(ep);
160 }
161 
162 static struct class iscsi_endpoint_class = {
163 	.name = "iscsi_endpoint",
164 	.dev_release = iscsi_endpoint_release,
165 };
166 
167 static ssize_t
168 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
169 {
170 	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
171 	return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
172 }
173 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
174 
175 static struct attribute *iscsi_endpoint_attrs[] = {
176 	&dev_attr_ep_handle.attr,
177 	NULL,
178 };
179 
180 static struct attribute_group iscsi_endpoint_group = {
181 	.attrs = iscsi_endpoint_attrs,
182 };
183 
184 #define ISCSI_MAX_EPID -1
185 
186 static int iscsi_match_epid(struct device *dev, const void *data)
187 {
188 	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
189 	const uint64_t *epid = data;
190 
191 	return *epid == ep->id;
192 }
193 
194 struct iscsi_endpoint *
195 iscsi_create_endpoint(int dd_size)
196 {
197 	struct device *dev;
198 	struct iscsi_endpoint *ep;
199 	uint64_t id;
200 	int err;
201 
202 	for (id = 1; id < ISCSI_MAX_EPID; id++) {
203 		dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
204 					iscsi_match_epid);
205 		if (!dev)
206 			break;
207 		else
208 			put_device(dev);
209 	}
210 	if (id == ISCSI_MAX_EPID) {
211 		printk(KERN_ERR "Too many connections. Max supported %u\n",
212 		       ISCSI_MAX_EPID - 1);
213 		return NULL;
214 	}
215 
216 	ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
217 	if (!ep)
218 		return NULL;
219 
220 	ep->id = id;
221 	ep->dev.class = &iscsi_endpoint_class;
222 	dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
223 	err = device_register(&ep->dev);
224         if (err)
225                 goto free_ep;
226 
227 	err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
228 	if (err)
229 		goto unregister_dev;
230 
231 	if (dd_size)
232 		ep->dd_data = &ep[1];
233 	return ep;
234 
235 unregister_dev:
236 	device_unregister(&ep->dev);
237 	return NULL;
238 
239 free_ep:
240 	kfree(ep);
241 	return NULL;
242 }
243 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
244 
245 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
246 {
247 	sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
248 	device_unregister(&ep->dev);
249 }
250 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
251 
252 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
253 {
254 	struct iscsi_endpoint *ep;
255 	struct device *dev;
256 
257 	dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
258 				iscsi_match_epid);
259 	if (!dev)
260 		return NULL;
261 
262 	ep = iscsi_dev_to_endpoint(dev);
263 	/*
264 	 * we can drop this now because the interface will prevent
265 	 * removals and lookups from racing.
266 	 */
267 	put_device(dev);
268 	return ep;
269 }
270 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
271 
272 /*
273  * Interface to display network param to sysfs
274  */
275 
276 static void iscsi_iface_release(struct device *dev)
277 {
278 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
279 	struct device *parent = iface->dev.parent;
280 
281 	kfree(iface);
282 	put_device(parent);
283 }
284 
285 
286 static struct class iscsi_iface_class = {
287 	.name = "iscsi_iface",
288 	.dev_release = iscsi_iface_release,
289 };
290 
291 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)	\
292 struct device_attribute dev_attr_##_prefix##_##_name =		\
293 	__ATTR(_name, _mode, _show, _store)
294 
295 /* iface attrs show */
296 #define iscsi_iface_attr_show(type, name, param_type, param)		\
297 static ssize_t								\
298 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
299 		     char *buf)						\
300 {									\
301 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);		\
302 	struct iscsi_transport *t = iface->transport;			\
303 	return t->get_iface_param(iface, param_type, param, buf);	\
304 }									\
305 
306 #define iscsi_iface_net_attr(type, name, param)				\
307 	iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)	\
308 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
309 
310 #define iscsi_iface_attr(type, name, param)				\
311 	iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)	\
312 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
313 
314 /* generic read only ipv4 attribute */
315 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
316 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
317 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
318 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
319 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
320 		     ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
321 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
322 		     ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
323 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
324 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
325 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
326 		     ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
327 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
328 		     ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
329 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
330 		     ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
331 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
332 		     ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
333 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
334 		     ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
335 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
336 		     ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
337 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
338 		     ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
339 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
340 		     ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
341 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
342 		     ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
343 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
344 
345 /* generic read only ipv6 attribute */
346 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
347 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
348 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL);
349 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
350 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
351 		     ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
352 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
353 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
354 iscsi_iface_net_attr(ipv6_iface, link_local_state,
355 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
356 iscsi_iface_net_attr(ipv6_iface, router_state,
357 		     ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
358 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
359 		     ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
360 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
361 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
362 iscsi_iface_net_attr(ipv6_iface, traffic_class,
363 		     ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
364 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
365 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
366 		     ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
367 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
368 		     ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
369 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
370 		     ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
371 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
372 		     ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
373 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
374 		     ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
375 
376 /* common read only iface attribute */
377 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
378 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
379 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
380 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
381 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
382 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
383 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
384 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
385 iscsi_iface_net_attr(iface, tcp_nagle_disable,
386 		     ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
387 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
388 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
389 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
390 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
391 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
392 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
393 
394 /* common iscsi specific settings attributes */
395 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
396 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
397 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
398 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
399 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
400 iscsi_iface_attr(iface, data_seq_in_order,
401 		 ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
402 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
403 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
404 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
405 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
406 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
407 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
408 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
409 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
410 iscsi_iface_attr(iface, discovery_auth_optional,
411 		 ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
412 iscsi_iface_attr(iface, discovery_logout,
413 		 ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
414 iscsi_iface_attr(iface, strict_login_comp_en,
415 		 ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
416 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
417 
418 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
419 					  struct attribute *attr, int i)
420 {
421 	struct device *dev = container_of(kobj, struct device, kobj);
422 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
423 	struct iscsi_transport *t = iface->transport;
424 	int param;
425 	int param_type;
426 
427 	if (attr == &dev_attr_iface_enabled.attr)
428 		param = ISCSI_NET_PARAM_IFACE_ENABLE;
429 	else if (attr == &dev_attr_iface_vlan_id.attr)
430 		param = ISCSI_NET_PARAM_VLAN_ID;
431 	else if (attr == &dev_attr_iface_vlan_priority.attr)
432 		param = ISCSI_NET_PARAM_VLAN_PRIORITY;
433 	else if (attr == &dev_attr_iface_vlan_enabled.attr)
434 		param = ISCSI_NET_PARAM_VLAN_ENABLED;
435 	else if (attr == &dev_attr_iface_mtu.attr)
436 		param = ISCSI_NET_PARAM_MTU;
437 	else if (attr == &dev_attr_iface_port.attr)
438 		param = ISCSI_NET_PARAM_PORT;
439 	else if (attr == &dev_attr_iface_ipaddress_state.attr)
440 		param = ISCSI_NET_PARAM_IPADDR_STATE;
441 	else if (attr == &dev_attr_iface_delayed_ack_en.attr)
442 		param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
443 	else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
444 		param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
445 	else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
446 		param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
447 	else if (attr == &dev_attr_iface_tcp_wsf.attr)
448 		param = ISCSI_NET_PARAM_TCP_WSF;
449 	else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
450 		param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
451 	else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
452 		param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
453 	else if (attr == &dev_attr_iface_cache_id.attr)
454 		param = ISCSI_NET_PARAM_CACHE_ID;
455 	else if (attr == &dev_attr_iface_redirect_en.attr)
456 		param = ISCSI_NET_PARAM_REDIRECT_EN;
457 	else if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
458 		param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
459 	else if (attr == &dev_attr_iface_header_digest.attr)
460 		param = ISCSI_IFACE_PARAM_HDRDGST_EN;
461 	else if (attr == &dev_attr_iface_data_digest.attr)
462 		param = ISCSI_IFACE_PARAM_DATADGST_EN;
463 	else if (attr == &dev_attr_iface_immediate_data.attr)
464 		param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
465 	else if (attr == &dev_attr_iface_initial_r2t.attr)
466 		param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
467 	else if (attr == &dev_attr_iface_data_seq_in_order.attr)
468 		param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
469 	else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
470 		param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
471 	else if (attr == &dev_attr_iface_erl.attr)
472 		param = ISCSI_IFACE_PARAM_ERL;
473 	else if (attr == &dev_attr_iface_max_recv_dlength.attr)
474 		param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
475 	else if (attr == &dev_attr_iface_first_burst_len.attr)
476 		param = ISCSI_IFACE_PARAM_FIRST_BURST;
477 	else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
478 		param = ISCSI_IFACE_PARAM_MAX_R2T;
479 	else if (attr == &dev_attr_iface_max_burst_len.attr)
480 		param = ISCSI_IFACE_PARAM_MAX_BURST;
481 	else if (attr == &dev_attr_iface_chap_auth.attr)
482 		param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
483 	else if (attr == &dev_attr_iface_bidi_chap.attr)
484 		param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
485 	else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
486 		param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
487 	else if (attr == &dev_attr_iface_discovery_logout.attr)
488 		param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
489 	else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
490 		param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
491 	else if (attr == &dev_attr_iface_initiator_name.attr)
492 		param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
493 	else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
494 		if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
495 			param = ISCSI_NET_PARAM_IPV4_ADDR;
496 		else if (attr == &dev_attr_ipv4_iface_gateway.attr)
497 			param = ISCSI_NET_PARAM_IPV4_GW;
498 		else if (attr == &dev_attr_ipv4_iface_subnet.attr)
499 			param = ISCSI_NET_PARAM_IPV4_SUBNET;
500 		else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
501 			param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
502 		else if (attr ==
503 			 &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
504 			param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
505 		else if (attr ==
506 			 &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
507 			param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
508 		else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
509 			param = ISCSI_NET_PARAM_IPV4_TOS_EN;
510 		else if (attr == &dev_attr_ipv4_iface_tos.attr)
511 			param = ISCSI_NET_PARAM_IPV4_TOS;
512 		else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
513 			param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
514 		else if (attr ==
515 			 &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
516 			param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
517 		else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
518 			param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
519 		else if (attr ==
520 			 &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
521 			param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
522 		else if (attr ==
523 			 &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
524 			param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
525 		else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
526 			param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
527 		else if (attr ==
528 			 &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
529 			param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
530 		else if (attr ==
531 			 &dev_attr_ipv4_iface_fragment_disable.attr)
532 			param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
533 		else if (attr ==
534 			 &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
535 			param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
536 		else if (attr == &dev_attr_ipv4_iface_ttl.attr)
537 			param = ISCSI_NET_PARAM_IPV4_TTL;
538 		else
539 			return 0;
540 	} else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
541 		if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
542 			param = ISCSI_NET_PARAM_IPV6_ADDR;
543 		else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
544 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
545 		else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
546 			param = ISCSI_NET_PARAM_IPV6_ROUTER;
547 		else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
548 			param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
549 		else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
550 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
551 		else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
552 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
553 		else if (attr == &dev_attr_ipv6_iface_router_state.attr)
554 			param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
555 		else if (attr ==
556 			 &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
557 			param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
558 		else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
559 			param = ISCSI_NET_PARAM_IPV6_MLD_EN;
560 		else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
561 			param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
562 		else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
563 			param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
564 		else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
565 			param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
566 		else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
567 			param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
568 		else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
569 			param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
570 		else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
571 			param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
572 		else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
573 			param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
574 		else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
575 			param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
576 		else
577 			return 0;
578 	} else {
579 		WARN_ONCE(1, "Invalid iface attr");
580 		return 0;
581 	}
582 
583 	switch (param) {
584 	case ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO:
585 	case ISCSI_IFACE_PARAM_HDRDGST_EN:
586 	case ISCSI_IFACE_PARAM_DATADGST_EN:
587 	case ISCSI_IFACE_PARAM_IMM_DATA_EN:
588 	case ISCSI_IFACE_PARAM_INITIAL_R2T_EN:
589 	case ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN:
590 	case ISCSI_IFACE_PARAM_PDU_INORDER_EN:
591 	case ISCSI_IFACE_PARAM_ERL:
592 	case ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH:
593 	case ISCSI_IFACE_PARAM_FIRST_BURST:
594 	case ISCSI_IFACE_PARAM_MAX_R2T:
595 	case ISCSI_IFACE_PARAM_MAX_BURST:
596 	case ISCSI_IFACE_PARAM_CHAP_AUTH_EN:
597 	case ISCSI_IFACE_PARAM_BIDI_CHAP_EN:
598 	case ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL:
599 	case ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN:
600 	case ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN:
601 	case ISCSI_IFACE_PARAM_INITIATOR_NAME:
602 		param_type = ISCSI_IFACE_PARAM;
603 		break;
604 	default:
605 		param_type = ISCSI_NET_PARAM;
606 	}
607 
608 	return t->attr_is_visible(param_type, param);
609 }
610 
611 static struct attribute *iscsi_iface_attrs[] = {
612 	&dev_attr_iface_enabled.attr,
613 	&dev_attr_iface_vlan_id.attr,
614 	&dev_attr_iface_vlan_priority.attr,
615 	&dev_attr_iface_vlan_enabled.attr,
616 	&dev_attr_ipv4_iface_ipaddress.attr,
617 	&dev_attr_ipv4_iface_gateway.attr,
618 	&dev_attr_ipv4_iface_subnet.attr,
619 	&dev_attr_ipv4_iface_bootproto.attr,
620 	&dev_attr_ipv6_iface_ipaddress.attr,
621 	&dev_attr_ipv6_iface_link_local_addr.attr,
622 	&dev_attr_ipv6_iface_router_addr.attr,
623 	&dev_attr_ipv6_iface_ipaddr_autocfg.attr,
624 	&dev_attr_ipv6_iface_link_local_autocfg.attr,
625 	&dev_attr_iface_mtu.attr,
626 	&dev_attr_iface_port.attr,
627 	&dev_attr_iface_ipaddress_state.attr,
628 	&dev_attr_iface_delayed_ack_en.attr,
629 	&dev_attr_iface_tcp_nagle_disable.attr,
630 	&dev_attr_iface_tcp_wsf_disable.attr,
631 	&dev_attr_iface_tcp_wsf.attr,
632 	&dev_attr_iface_tcp_timer_scale.attr,
633 	&dev_attr_iface_tcp_timestamp_en.attr,
634 	&dev_attr_iface_cache_id.attr,
635 	&dev_attr_iface_redirect_en.attr,
636 	&dev_attr_iface_def_taskmgmt_tmo.attr,
637 	&dev_attr_iface_header_digest.attr,
638 	&dev_attr_iface_data_digest.attr,
639 	&dev_attr_iface_immediate_data.attr,
640 	&dev_attr_iface_initial_r2t.attr,
641 	&dev_attr_iface_data_seq_in_order.attr,
642 	&dev_attr_iface_data_pdu_in_order.attr,
643 	&dev_attr_iface_erl.attr,
644 	&dev_attr_iface_max_recv_dlength.attr,
645 	&dev_attr_iface_first_burst_len.attr,
646 	&dev_attr_iface_max_outstanding_r2t.attr,
647 	&dev_attr_iface_max_burst_len.attr,
648 	&dev_attr_iface_chap_auth.attr,
649 	&dev_attr_iface_bidi_chap.attr,
650 	&dev_attr_iface_discovery_auth_optional.attr,
651 	&dev_attr_iface_discovery_logout.attr,
652 	&dev_attr_iface_strict_login_comp_en.attr,
653 	&dev_attr_iface_initiator_name.attr,
654 	&dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
655 	&dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
656 	&dev_attr_ipv4_iface_tos_en.attr,
657 	&dev_attr_ipv4_iface_tos.attr,
658 	&dev_attr_ipv4_iface_grat_arp_en.attr,
659 	&dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
660 	&dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
661 	&dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
662 	&dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
663 	&dev_attr_ipv4_iface_dhcp_vendor_id.attr,
664 	&dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
665 	&dev_attr_ipv4_iface_fragment_disable.attr,
666 	&dev_attr_ipv4_iface_incoming_forwarding_en.attr,
667 	&dev_attr_ipv4_iface_ttl.attr,
668 	&dev_attr_ipv6_iface_link_local_state.attr,
669 	&dev_attr_ipv6_iface_router_state.attr,
670 	&dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
671 	&dev_attr_ipv6_iface_mld_en.attr,
672 	&dev_attr_ipv6_iface_flow_label.attr,
673 	&dev_attr_ipv6_iface_traffic_class.attr,
674 	&dev_attr_ipv6_iface_hop_limit.attr,
675 	&dev_attr_ipv6_iface_nd_reachable_tmo.attr,
676 	&dev_attr_ipv6_iface_nd_rexmit_time.attr,
677 	&dev_attr_ipv6_iface_nd_stale_tmo.attr,
678 	&dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
679 	&dev_attr_ipv6_iface_router_adv_link_mtu.attr,
680 	NULL,
681 };
682 
683 static struct attribute_group iscsi_iface_group = {
684 	.attrs = iscsi_iface_attrs,
685 	.is_visible = iscsi_iface_attr_is_visible,
686 };
687 
688 /* convert iscsi_ipaddress_state values to ascii string name */
689 static const struct {
690 	enum iscsi_ipaddress_state	value;
691 	char				*name;
692 } iscsi_ipaddress_state_names[] = {
693 	{ISCSI_IPDDRESS_STATE_UNCONFIGURED,	"Unconfigured" },
694 	{ISCSI_IPDDRESS_STATE_ACQUIRING,	"Acquiring" },
695 	{ISCSI_IPDDRESS_STATE_TENTATIVE,	"Tentative" },
696 	{ISCSI_IPDDRESS_STATE_VALID,		"Valid" },
697 	{ISCSI_IPDDRESS_STATE_DISABLING,	"Disabling" },
698 	{ISCSI_IPDDRESS_STATE_INVALID,		"Invalid" },
699 	{ISCSI_IPDDRESS_STATE_DEPRECATED,	"Deprecated" },
700 };
701 
702 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
703 {
704 	int i;
705 	char *state = NULL;
706 
707 	for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
708 		if (iscsi_ipaddress_state_names[i].value == port_state) {
709 			state = iscsi_ipaddress_state_names[i].name;
710 			break;
711 		}
712 	}
713 	return state;
714 }
715 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
716 
717 /* convert iscsi_router_state values to ascii string name */
718 static const struct {
719 	enum iscsi_router_state	value;
720 	char			*name;
721 } iscsi_router_state_names[] = {
722 	{ISCSI_ROUTER_STATE_UNKNOWN,		"Unknown" },
723 	{ISCSI_ROUTER_STATE_ADVERTISED,		"Advertised" },
724 	{ISCSI_ROUTER_STATE_MANUAL,		"Manual" },
725 	{ISCSI_ROUTER_STATE_STALE,		"Stale" },
726 };
727 
728 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
729 {
730 	int i;
731 	char *state = NULL;
732 
733 	for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
734 		if (iscsi_router_state_names[i].value == router_state) {
735 			state = iscsi_router_state_names[i].name;
736 			break;
737 		}
738 	}
739 	return state;
740 }
741 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
742 
743 struct iscsi_iface *
744 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
745 		   uint32_t iface_type, uint32_t iface_num, int dd_size)
746 {
747 	struct iscsi_iface *iface;
748 	int err;
749 
750 	iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
751 	if (!iface)
752 		return NULL;
753 
754 	iface->transport = transport;
755 	iface->iface_type = iface_type;
756 	iface->iface_num = iface_num;
757 	iface->dev.release = iscsi_iface_release;
758 	iface->dev.class = &iscsi_iface_class;
759 	/* parent reference released in iscsi_iface_release */
760 	iface->dev.parent = get_device(&shost->shost_gendev);
761 	if (iface_type == ISCSI_IFACE_TYPE_IPV4)
762 		dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
763 			     iface_num);
764 	else
765 		dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
766 			     iface_num);
767 
768 	err = device_register(&iface->dev);
769 	if (err)
770 		goto free_iface;
771 
772 	err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
773 	if (err)
774 		goto unreg_iface;
775 
776 	if (dd_size)
777 		iface->dd_data = &iface[1];
778 	return iface;
779 
780 unreg_iface:
781 	device_unregister(&iface->dev);
782 	return NULL;
783 
784 free_iface:
785 	put_device(iface->dev.parent);
786 	kfree(iface);
787 	return NULL;
788 }
789 EXPORT_SYMBOL_GPL(iscsi_create_iface);
790 
791 void iscsi_destroy_iface(struct iscsi_iface *iface)
792 {
793 	sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
794 	device_unregister(&iface->dev);
795 }
796 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
797 
798 /*
799  * Interface to display flash node params to sysfs
800  */
801 
802 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)	\
803 struct device_attribute dev_attr_##_prefix##_##_name =			\
804 	__ATTR(_name, _mode, _show, _store)
805 
806 /* flash node session attrs show */
807 #define iscsi_flashnode_sess_attr_show(type, name, param)		\
808 static ssize_t								\
809 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
810 		     char *buf)						\
811 {									\
812 	struct iscsi_bus_flash_session *fnode_sess =			\
813 					iscsi_dev_to_flash_session(dev);\
814 	struct iscsi_transport *t = fnode_sess->transport;		\
815 	return t->get_flashnode_param(fnode_sess, param, buf);		\
816 }									\
817 
818 
819 #define iscsi_flashnode_sess_attr(type, name, param)			\
820 	iscsi_flashnode_sess_attr_show(type, name, param)		\
821 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,			\
822 			    show_##type##_##name, NULL);
823 
824 /* Flash node session attributes */
825 
826 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
827 			  ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
828 iscsi_flashnode_sess_attr(fnode, discovery_session,
829 			  ISCSI_FLASHNODE_DISCOVERY_SESS);
830 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
831 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
832 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
833 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
834 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
835 			  ISCSI_FLASHNODE_DATASEQ_INORDER);
836 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
837 			  ISCSI_FLASHNODE_PDU_INORDER);
838 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
839 iscsi_flashnode_sess_attr(fnode, discovery_logout,
840 			  ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
841 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
842 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
843 			  ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
844 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
845 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
846 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
847 iscsi_flashnode_sess_attr(fnode, def_time2retain,
848 			  ISCSI_FLASHNODE_DEF_TIME2RETAIN);
849 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
850 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
851 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
852 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
853 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
854 			  ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
855 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
856 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
857 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
858 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
859 			  ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
860 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
861 			  ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
862 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
863 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
864 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
865 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
866 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
867 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
868 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
869 
870 static struct attribute *iscsi_flashnode_sess_attrs[] = {
871 	&dev_attr_fnode_auto_snd_tgt_disable.attr,
872 	&dev_attr_fnode_discovery_session.attr,
873 	&dev_attr_fnode_portal_type.attr,
874 	&dev_attr_fnode_entry_enable.attr,
875 	&dev_attr_fnode_immediate_data.attr,
876 	&dev_attr_fnode_initial_r2t.attr,
877 	&dev_attr_fnode_data_seq_in_order.attr,
878 	&dev_attr_fnode_data_pdu_in_order.attr,
879 	&dev_attr_fnode_chap_auth.attr,
880 	&dev_attr_fnode_discovery_logout.attr,
881 	&dev_attr_fnode_bidi_chap.attr,
882 	&dev_attr_fnode_discovery_auth_optional.attr,
883 	&dev_attr_fnode_erl.attr,
884 	&dev_attr_fnode_first_burst_len.attr,
885 	&dev_attr_fnode_def_time2wait.attr,
886 	&dev_attr_fnode_def_time2retain.attr,
887 	&dev_attr_fnode_max_outstanding_r2t.attr,
888 	&dev_attr_fnode_isid.attr,
889 	&dev_attr_fnode_tsid.attr,
890 	&dev_attr_fnode_max_burst_len.attr,
891 	&dev_attr_fnode_def_taskmgmt_tmo.attr,
892 	&dev_attr_fnode_targetalias.attr,
893 	&dev_attr_fnode_targetname.attr,
894 	&dev_attr_fnode_tpgt.attr,
895 	&dev_attr_fnode_discovery_parent_idx.attr,
896 	&dev_attr_fnode_discovery_parent_type.attr,
897 	&dev_attr_fnode_chap_in_idx.attr,
898 	&dev_attr_fnode_chap_out_idx.attr,
899 	&dev_attr_fnode_username.attr,
900 	&dev_attr_fnode_username_in.attr,
901 	&dev_attr_fnode_password.attr,
902 	&dev_attr_fnode_password_in.attr,
903 	&dev_attr_fnode_is_boot_target.attr,
904 	NULL,
905 };
906 
907 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
908 						    struct attribute *attr,
909 						    int i)
910 {
911 	struct device *dev = container_of(kobj, struct device, kobj);
912 	struct iscsi_bus_flash_session *fnode_sess =
913 						iscsi_dev_to_flash_session(dev);
914 	struct iscsi_transport *t = fnode_sess->transport;
915 	int param;
916 
917 	if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
918 		param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
919 	} else if (attr == &dev_attr_fnode_discovery_session.attr) {
920 		param = ISCSI_FLASHNODE_DISCOVERY_SESS;
921 	} else if (attr == &dev_attr_fnode_portal_type.attr) {
922 		param = ISCSI_FLASHNODE_PORTAL_TYPE;
923 	} else if (attr == &dev_attr_fnode_entry_enable.attr) {
924 		param = ISCSI_FLASHNODE_ENTRY_EN;
925 	} else if (attr == &dev_attr_fnode_immediate_data.attr) {
926 		param = ISCSI_FLASHNODE_IMM_DATA_EN;
927 	} else if (attr == &dev_attr_fnode_initial_r2t.attr) {
928 		param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
929 	} else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
930 		param = ISCSI_FLASHNODE_DATASEQ_INORDER;
931 	} else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
932 		param = ISCSI_FLASHNODE_PDU_INORDER;
933 	} else if (attr == &dev_attr_fnode_chap_auth.attr) {
934 		param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
935 	} else if (attr == &dev_attr_fnode_discovery_logout.attr) {
936 		param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
937 	} else if (attr == &dev_attr_fnode_bidi_chap.attr) {
938 		param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
939 	} else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
940 		param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
941 	} else if (attr == &dev_attr_fnode_erl.attr) {
942 		param = ISCSI_FLASHNODE_ERL;
943 	} else if (attr == &dev_attr_fnode_first_burst_len.attr) {
944 		param = ISCSI_FLASHNODE_FIRST_BURST;
945 	} else if (attr == &dev_attr_fnode_def_time2wait.attr) {
946 		param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
947 	} else if (attr == &dev_attr_fnode_def_time2retain.attr) {
948 		param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
949 	} else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
950 		param = ISCSI_FLASHNODE_MAX_R2T;
951 	} else if (attr == &dev_attr_fnode_isid.attr) {
952 		param = ISCSI_FLASHNODE_ISID;
953 	} else if (attr == &dev_attr_fnode_tsid.attr) {
954 		param = ISCSI_FLASHNODE_TSID;
955 	} else if (attr == &dev_attr_fnode_max_burst_len.attr) {
956 		param = ISCSI_FLASHNODE_MAX_BURST;
957 	} else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
958 		param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
959 	} else if (attr == &dev_attr_fnode_targetalias.attr) {
960 		param = ISCSI_FLASHNODE_ALIAS;
961 	} else if (attr == &dev_attr_fnode_targetname.attr) {
962 		param = ISCSI_FLASHNODE_NAME;
963 	} else if (attr == &dev_attr_fnode_tpgt.attr) {
964 		param = ISCSI_FLASHNODE_TPGT;
965 	} else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
966 		param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
967 	} else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
968 		param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
969 	} else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
970 		param = ISCSI_FLASHNODE_CHAP_IN_IDX;
971 	} else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
972 		param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
973 	} else if (attr == &dev_attr_fnode_username.attr) {
974 		param = ISCSI_FLASHNODE_USERNAME;
975 	} else if (attr == &dev_attr_fnode_username_in.attr) {
976 		param = ISCSI_FLASHNODE_USERNAME_IN;
977 	} else if (attr == &dev_attr_fnode_password.attr) {
978 		param = ISCSI_FLASHNODE_PASSWORD;
979 	} else if (attr == &dev_attr_fnode_password_in.attr) {
980 		param = ISCSI_FLASHNODE_PASSWORD_IN;
981 	} else if (attr == &dev_attr_fnode_is_boot_target.attr) {
982 		param = ISCSI_FLASHNODE_IS_BOOT_TGT;
983 	} else {
984 		WARN_ONCE(1, "Invalid flashnode session attr");
985 		return 0;
986 	}
987 
988 	return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
989 }
990 
991 static struct attribute_group iscsi_flashnode_sess_attr_group = {
992 	.attrs = iscsi_flashnode_sess_attrs,
993 	.is_visible = iscsi_flashnode_sess_attr_is_visible,
994 };
995 
996 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
997 	&iscsi_flashnode_sess_attr_group,
998 	NULL,
999 };
1000 
1001 static void iscsi_flashnode_sess_release(struct device *dev)
1002 {
1003 	struct iscsi_bus_flash_session *fnode_sess =
1004 						iscsi_dev_to_flash_session(dev);
1005 
1006 	kfree(fnode_sess->targetname);
1007 	kfree(fnode_sess->targetalias);
1008 	kfree(fnode_sess->portal_type);
1009 	kfree(fnode_sess);
1010 }
1011 
1012 static const struct device_type iscsi_flashnode_sess_dev_type = {
1013 	.name = "iscsi_flashnode_sess_dev_type",
1014 	.groups = iscsi_flashnode_sess_attr_groups,
1015 	.release = iscsi_flashnode_sess_release,
1016 };
1017 
1018 /* flash node connection attrs show */
1019 #define iscsi_flashnode_conn_attr_show(type, name, param)		\
1020 static ssize_t								\
1021 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
1022 		     char *buf)						\
1023 {									\
1024 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1025 	struct iscsi_bus_flash_session *fnode_sess =			\
1026 				iscsi_flash_conn_to_flash_session(fnode_conn);\
1027 	struct iscsi_transport *t = fnode_conn->transport;		\
1028 	return t->get_flashnode_param(fnode_sess, param, buf);		\
1029 }									\
1030 
1031 
1032 #define iscsi_flashnode_conn_attr(type, name, param)			\
1033 	iscsi_flashnode_conn_attr_show(type, name, param)		\
1034 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,			\
1035 			    show_##type##_##name, NULL);
1036 
1037 /* Flash node connection attributes */
1038 
1039 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1040 			  ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1041 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1042 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1043 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1044 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1045 			  ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1046 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1047 			  ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1048 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1049 			  ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1050 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1051 			  ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1052 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1053 			  ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1054 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1055 			  ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1056 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1057 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1058 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1059 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1060 			  ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1061 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1062 			  ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1063 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1064 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1065 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1066 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1067 			  ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1068 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1069 			  ISCSI_FLASHNODE_REDIRECT_IPADDR);
1070 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1071 			  ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1072 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1073 			  ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1074 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1075 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1076 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1077 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1078 
1079 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1080 	&dev_attr_fnode_is_fw_assigned_ipv6.attr,
1081 	&dev_attr_fnode_header_digest.attr,
1082 	&dev_attr_fnode_data_digest.attr,
1083 	&dev_attr_fnode_snack_req.attr,
1084 	&dev_attr_fnode_tcp_timestamp_stat.attr,
1085 	&dev_attr_fnode_tcp_nagle_disable.attr,
1086 	&dev_attr_fnode_tcp_wsf_disable.attr,
1087 	&dev_attr_fnode_tcp_timer_scale.attr,
1088 	&dev_attr_fnode_tcp_timestamp_enable.attr,
1089 	&dev_attr_fnode_fragment_disable.attr,
1090 	&dev_attr_fnode_max_recv_dlength.attr,
1091 	&dev_attr_fnode_max_xmit_dlength.attr,
1092 	&dev_attr_fnode_keepalive_tmo.attr,
1093 	&dev_attr_fnode_port.attr,
1094 	&dev_attr_fnode_ipaddress.attr,
1095 	&dev_attr_fnode_redirect_ipaddr.attr,
1096 	&dev_attr_fnode_max_segment_size.attr,
1097 	&dev_attr_fnode_local_port.attr,
1098 	&dev_attr_fnode_ipv4_tos.attr,
1099 	&dev_attr_fnode_ipv6_traffic_class.attr,
1100 	&dev_attr_fnode_ipv6_flow_label.attr,
1101 	&dev_attr_fnode_link_local_ipv6.attr,
1102 	&dev_attr_fnode_tcp_xmit_wsf.attr,
1103 	&dev_attr_fnode_tcp_recv_wsf.attr,
1104 	&dev_attr_fnode_statsn.attr,
1105 	&dev_attr_fnode_exp_statsn.attr,
1106 	NULL,
1107 };
1108 
1109 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1110 						    struct attribute *attr,
1111 						    int i)
1112 {
1113 	struct device *dev = container_of(kobj, struct device, kobj);
1114 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1115 	struct iscsi_transport *t = fnode_conn->transport;
1116 	int param;
1117 
1118 	if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1119 		param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1120 	} else if (attr == &dev_attr_fnode_header_digest.attr) {
1121 		param = ISCSI_FLASHNODE_HDR_DGST_EN;
1122 	} else if (attr == &dev_attr_fnode_data_digest.attr) {
1123 		param = ISCSI_FLASHNODE_DATA_DGST_EN;
1124 	} else if (attr == &dev_attr_fnode_snack_req.attr) {
1125 		param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1126 	} else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1127 		param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1128 	} else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1129 		param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1130 	} else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1131 		param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1132 	} else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1133 		param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1134 	} else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1135 		param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1136 	} else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1137 		param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1138 	} else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1139 		param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1140 	} else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1141 		param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1142 	} else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1143 		param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1144 	} else if (attr == &dev_attr_fnode_port.attr) {
1145 		param = ISCSI_FLASHNODE_PORT;
1146 	} else if (attr == &dev_attr_fnode_ipaddress.attr) {
1147 		param = ISCSI_FLASHNODE_IPADDR;
1148 	} else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1149 		param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1150 	} else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1151 		param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1152 	} else if (attr == &dev_attr_fnode_local_port.attr) {
1153 		param = ISCSI_FLASHNODE_LOCAL_PORT;
1154 	} else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1155 		param = ISCSI_FLASHNODE_IPV4_TOS;
1156 	} else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1157 		param = ISCSI_FLASHNODE_IPV6_TC;
1158 	} else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1159 		param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1160 	} else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1161 		param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1162 	} else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1163 		param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1164 	} else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1165 		param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1166 	} else if (attr == &dev_attr_fnode_statsn.attr) {
1167 		param = ISCSI_FLASHNODE_STATSN;
1168 	} else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1169 		param = ISCSI_FLASHNODE_EXP_STATSN;
1170 	} else {
1171 		WARN_ONCE(1, "Invalid flashnode connection attr");
1172 		return 0;
1173 	}
1174 
1175 	return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1176 }
1177 
1178 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1179 	.attrs = iscsi_flashnode_conn_attrs,
1180 	.is_visible = iscsi_flashnode_conn_attr_is_visible,
1181 };
1182 
1183 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1184 	&iscsi_flashnode_conn_attr_group,
1185 	NULL,
1186 };
1187 
1188 static void iscsi_flashnode_conn_release(struct device *dev)
1189 {
1190 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1191 
1192 	kfree(fnode_conn->ipaddress);
1193 	kfree(fnode_conn->redirect_ipaddr);
1194 	kfree(fnode_conn->link_local_ipv6_addr);
1195 	kfree(fnode_conn);
1196 }
1197 
1198 static const struct device_type iscsi_flashnode_conn_dev_type = {
1199 	.name = "iscsi_flashnode_conn_dev_type",
1200 	.groups = iscsi_flashnode_conn_attr_groups,
1201 	.release = iscsi_flashnode_conn_release,
1202 };
1203 
1204 static struct bus_type iscsi_flashnode_bus;
1205 
1206 int iscsi_flashnode_bus_match(struct device *dev,
1207 				     struct device_driver *drv)
1208 {
1209 	if (dev->bus == &iscsi_flashnode_bus)
1210 		return 1;
1211 	return 0;
1212 }
1213 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1214 
1215 static struct bus_type iscsi_flashnode_bus = {
1216 	.name = "iscsi_flashnode",
1217 	.match = &iscsi_flashnode_bus_match,
1218 };
1219 
1220 /**
1221  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1222  * @shost: pointer to host data
1223  * @index: index of flashnode to add in sysfs
1224  * @transport: pointer to transport data
1225  * @dd_size: total size to allocate
1226  *
1227  * Adds a sysfs entry for the flashnode session attributes
1228  *
1229  * Returns:
1230  *  pointer to allocated flashnode sess on success
1231  *  %NULL on failure
1232  */
1233 struct iscsi_bus_flash_session *
1234 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1235 			    struct iscsi_transport *transport,
1236 			    int dd_size)
1237 {
1238 	struct iscsi_bus_flash_session *fnode_sess;
1239 	int err;
1240 
1241 	fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1242 	if (!fnode_sess)
1243 		return NULL;
1244 
1245 	fnode_sess->transport = transport;
1246 	fnode_sess->target_id = index;
1247 	fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1248 	fnode_sess->dev.bus = &iscsi_flashnode_bus;
1249 	fnode_sess->dev.parent = &shost->shost_gendev;
1250 	dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1251 		     shost->host_no, index);
1252 
1253 	err = device_register(&fnode_sess->dev);
1254 	if (err)
1255 		goto free_fnode_sess;
1256 
1257 	if (dd_size)
1258 		fnode_sess->dd_data = &fnode_sess[1];
1259 
1260 	return fnode_sess;
1261 
1262 free_fnode_sess:
1263 	kfree(fnode_sess);
1264 	return NULL;
1265 }
1266 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1267 
1268 /**
1269  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1270  * @shost: pointer to host data
1271  * @fnode_sess: pointer to the parent flashnode session entry
1272  * @transport: pointer to transport data
1273  * @dd_size: total size to allocate
1274  *
1275  * Adds a sysfs entry for the flashnode connection attributes
1276  *
1277  * Returns:
1278  *  pointer to allocated flashnode conn on success
1279  *  %NULL on failure
1280  */
1281 struct iscsi_bus_flash_conn *
1282 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1283 			    struct iscsi_bus_flash_session *fnode_sess,
1284 			    struct iscsi_transport *transport,
1285 			    int dd_size)
1286 {
1287 	struct iscsi_bus_flash_conn *fnode_conn;
1288 	int err;
1289 
1290 	fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1291 	if (!fnode_conn)
1292 		return NULL;
1293 
1294 	fnode_conn->transport = transport;
1295 	fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1296 	fnode_conn->dev.bus = &iscsi_flashnode_bus;
1297 	fnode_conn->dev.parent = &fnode_sess->dev;
1298 	dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1299 		     shost->host_no, fnode_sess->target_id);
1300 
1301 	err = device_register(&fnode_conn->dev);
1302 	if (err)
1303 		goto free_fnode_conn;
1304 
1305 	if (dd_size)
1306 		fnode_conn->dd_data = &fnode_conn[1];
1307 
1308 	return fnode_conn;
1309 
1310 free_fnode_conn:
1311 	kfree(fnode_conn);
1312 	return NULL;
1313 }
1314 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1315 
1316 /**
1317  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1318  * @dev: device to verify
1319  * @data: pointer to data containing value to use for verification
1320  *
1321  * Verifies if the passed device is flashnode conn device
1322  *
1323  * Returns:
1324  *  1 on success
1325  *  0 on failure
1326  */
1327 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1328 {
1329 	return dev->bus == &iscsi_flashnode_bus;
1330 }
1331 
1332 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1333 {
1334 	device_unregister(&fnode_conn->dev);
1335 	return 0;
1336 }
1337 
1338 static int flashnode_match_index(struct device *dev, void *data)
1339 {
1340 	struct iscsi_bus_flash_session *fnode_sess = NULL;
1341 	int ret = 0;
1342 
1343 	if (!iscsi_flashnode_bus_match(dev, NULL))
1344 		goto exit_match_index;
1345 
1346 	fnode_sess = iscsi_dev_to_flash_session(dev);
1347 	ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1348 
1349 exit_match_index:
1350 	return ret;
1351 }
1352 
1353 /**
1354  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1355  * @shost: pointer to host data
1356  * @idx: index to match
1357  *
1358  * Finds the flashnode session object for the passed index
1359  *
1360  * Returns:
1361  *  pointer to found flashnode session object on success
1362  *  %NULL on failure
1363  */
1364 static struct iscsi_bus_flash_session *
1365 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1366 {
1367 	struct iscsi_bus_flash_session *fnode_sess = NULL;
1368 	struct device *dev;
1369 
1370 	dev = device_find_child(&shost->shost_gendev, &idx,
1371 				flashnode_match_index);
1372 	if (dev)
1373 		fnode_sess = iscsi_dev_to_flash_session(dev);
1374 
1375 	return fnode_sess;
1376 }
1377 
1378 /**
1379  * iscsi_find_flashnode_sess - finds flashnode session entry
1380  * @shost: pointer to host data
1381  * @data: pointer to data containing value to use for comparison
1382  * @fn: function pointer that does actual comparison
1383  *
1384  * Finds the flashnode session object comparing the data passed using logic
1385  * defined in passed function pointer
1386  *
1387  * Returns:
1388  *  pointer to found flashnode session device object on success
1389  *  %NULL on failure
1390  */
1391 struct device *
1392 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1393 			  int (*fn)(struct device *dev, void *data))
1394 {
1395 	return device_find_child(&shost->shost_gendev, data, fn);
1396 }
1397 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1398 
1399 /**
1400  * iscsi_find_flashnode_conn - finds flashnode connection entry
1401  * @fnode_sess: pointer to parent flashnode session entry
1402  *
1403  * Finds the flashnode connection object comparing the data passed using logic
1404  * defined in passed function pointer
1405  *
1406  * Returns:
1407  *  pointer to found flashnode connection device object on success
1408  *  %NULL on failure
1409  */
1410 struct device *
1411 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1412 {
1413 	return device_find_child(&fnode_sess->dev, NULL,
1414 				 iscsi_is_flashnode_conn_dev);
1415 }
1416 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1417 
1418 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1419 {
1420 	if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1421 		return 0;
1422 
1423 	return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1424 }
1425 
1426 /**
1427  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1428  * @fnode_sess: pointer to flashnode session entry to be destroyed
1429  *
1430  * Deletes the flashnode session entry and all children flashnode connection
1431  * entries from sysfs
1432  */
1433 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1434 {
1435 	int err;
1436 
1437 	err = device_for_each_child(&fnode_sess->dev, NULL,
1438 				    iscsi_iter_destroy_flashnode_conn_fn);
1439 	if (err)
1440 		pr_err("Could not delete all connections for %s. Error %d.\n",
1441 		       fnode_sess->dev.kobj.name, err);
1442 
1443 	device_unregister(&fnode_sess->dev);
1444 }
1445 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1446 
1447 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1448 {
1449 	if (!iscsi_flashnode_bus_match(dev, NULL))
1450 		return 0;
1451 
1452 	iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1453 	return 0;
1454 }
1455 
1456 /**
1457  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1458  * @shost: pointer to host data
1459  *
1460  * Destroys all the flashnode session entries and all corresponding children
1461  * flashnode connection entries from sysfs
1462  */
1463 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1464 {
1465 	device_for_each_child(&shost->shost_gendev, NULL,
1466 			      iscsi_iter_destroy_flashnode_fn);
1467 }
1468 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1469 
1470 /*
1471  * BSG support
1472  */
1473 /**
1474  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1475  * @job: bsg job to be processed
1476  */
1477 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1478 {
1479 	struct Scsi_Host *shost = iscsi_job_to_shost(job);
1480 	struct iscsi_bsg_request *req = job->request;
1481 	struct iscsi_bsg_reply *reply = job->reply;
1482 	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1483 	int cmdlen = sizeof(uint32_t);	/* start with length of msgcode */
1484 	int ret;
1485 
1486 	/* check if we have the msgcode value at least */
1487 	if (job->request_len < sizeof(uint32_t)) {
1488 		ret = -ENOMSG;
1489 		goto fail_host_msg;
1490 	}
1491 
1492 	/* Validate the host command */
1493 	switch (req->msgcode) {
1494 	case ISCSI_BSG_HST_VENDOR:
1495 		cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1496 		if ((shost->hostt->vendor_id == 0L) ||
1497 		    (req->rqst_data.h_vendor.vendor_id !=
1498 			shost->hostt->vendor_id)) {
1499 			ret = -ESRCH;
1500 			goto fail_host_msg;
1501 		}
1502 		break;
1503 	default:
1504 		ret = -EBADR;
1505 		goto fail_host_msg;
1506 	}
1507 
1508 	/* check if we really have all the request data needed */
1509 	if (job->request_len < cmdlen) {
1510 		ret = -ENOMSG;
1511 		goto fail_host_msg;
1512 	}
1513 
1514 	ret = i->iscsi_transport->bsg_request(job);
1515 	if (!ret)
1516 		return 0;
1517 
1518 fail_host_msg:
1519 	/* return the errno failure code as the only status */
1520 	BUG_ON(job->reply_len < sizeof(uint32_t));
1521 	reply->reply_payload_rcv_len = 0;
1522 	reply->result = ret;
1523 	job->reply_len = sizeof(uint32_t);
1524 	bsg_job_done(job, ret, 0);
1525 	return 0;
1526 }
1527 
1528 /**
1529  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1530  * @shost: shost for iscsi_host
1531  * @ihost: iscsi_cls_host adding the structures to
1532  */
1533 static int
1534 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1535 {
1536 	struct device *dev = &shost->shost_gendev;
1537 	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1538 	struct request_queue *q;
1539 	char bsg_name[20];
1540 
1541 	if (!i->iscsi_transport->bsg_request)
1542 		return -ENOTSUPP;
1543 
1544 	snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1545 	q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, 0, NULL);
1546 	if (IS_ERR(q)) {
1547 		shost_printk(KERN_ERR, shost, "bsg interface failed to "
1548 			     "initialize - no request queue\n");
1549 		return PTR_ERR(q);
1550 	}
1551 	__scsi_init_queue(shost, q);
1552 
1553 	ihost->bsg_q = q;
1554 	return 0;
1555 }
1556 
1557 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1558 			    struct device *cdev)
1559 {
1560 	struct Scsi_Host *shost = dev_to_shost(dev);
1561 	struct iscsi_cls_host *ihost = shost->shost_data;
1562 
1563 	memset(ihost, 0, sizeof(*ihost));
1564 	atomic_set(&ihost->nr_scans, 0);
1565 	mutex_init(&ihost->mutex);
1566 
1567 	iscsi_bsg_host_add(shost, ihost);
1568 	/* ignore any bsg add error - we just can't do sgio */
1569 
1570 	return 0;
1571 }
1572 
1573 static int iscsi_remove_host(struct transport_container *tc,
1574 			     struct device *dev, struct device *cdev)
1575 {
1576 	struct Scsi_Host *shost = dev_to_shost(dev);
1577 	struct iscsi_cls_host *ihost = shost->shost_data;
1578 
1579 	if (ihost->bsg_q) {
1580 		bsg_unregister_queue(ihost->bsg_q);
1581 		blk_cleanup_queue(ihost->bsg_q);
1582 	}
1583 	return 0;
1584 }
1585 
1586 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1587 			       "iscsi_host",
1588 			       iscsi_setup_host,
1589 			       iscsi_remove_host,
1590 			       NULL);
1591 
1592 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1593 			       "iscsi_session",
1594 			       NULL,
1595 			       NULL,
1596 			       NULL);
1597 
1598 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1599 			       "iscsi_connection",
1600 			       NULL,
1601 			       NULL,
1602 			       NULL);
1603 
1604 static struct sock *nls;
1605 static DEFINE_MUTEX(rx_queue_mutex);
1606 
1607 static LIST_HEAD(sesslist);
1608 static DEFINE_SPINLOCK(sesslock);
1609 static LIST_HEAD(connlist);
1610 static DEFINE_SPINLOCK(connlock);
1611 
1612 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1613 {
1614 	struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1615 	return sess->sid;
1616 }
1617 
1618 /*
1619  * Returns the matching session to a given sid
1620  */
1621 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1622 {
1623 	unsigned long flags;
1624 	struct iscsi_cls_session *sess;
1625 
1626 	spin_lock_irqsave(&sesslock, flags);
1627 	list_for_each_entry(sess, &sesslist, sess_list) {
1628 		if (sess->sid == sid) {
1629 			spin_unlock_irqrestore(&sesslock, flags);
1630 			return sess;
1631 		}
1632 	}
1633 	spin_unlock_irqrestore(&sesslock, flags);
1634 	return NULL;
1635 }
1636 
1637 /*
1638  * Returns the matching connection to a given sid / cid tuple
1639  */
1640 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1641 {
1642 	unsigned long flags;
1643 	struct iscsi_cls_conn *conn;
1644 
1645 	spin_lock_irqsave(&connlock, flags);
1646 	list_for_each_entry(conn, &connlist, conn_list) {
1647 		if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1648 			spin_unlock_irqrestore(&connlock, flags);
1649 			return conn;
1650 		}
1651 	}
1652 	spin_unlock_irqrestore(&connlock, flags);
1653 	return NULL;
1654 }
1655 
1656 /*
1657  * The following functions can be used by LLDs that allocate
1658  * their own scsi_hosts or by software iscsi LLDs
1659  */
1660 static struct {
1661 	int value;
1662 	char *name;
1663 } iscsi_session_state_names[] = {
1664 	{ ISCSI_SESSION_LOGGED_IN,	"LOGGED_IN" },
1665 	{ ISCSI_SESSION_FAILED,		"FAILED" },
1666 	{ ISCSI_SESSION_FREE,		"FREE" },
1667 };
1668 
1669 static const char *iscsi_session_state_name(int state)
1670 {
1671 	int i;
1672 	char *name = NULL;
1673 
1674 	for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1675 		if (iscsi_session_state_names[i].value == state) {
1676 			name = iscsi_session_state_names[i].name;
1677 			break;
1678 		}
1679 	}
1680 	return name;
1681 }
1682 
1683 int iscsi_session_chkready(struct iscsi_cls_session *session)
1684 {
1685 	unsigned long flags;
1686 	int err;
1687 
1688 	spin_lock_irqsave(&session->lock, flags);
1689 	switch (session->state) {
1690 	case ISCSI_SESSION_LOGGED_IN:
1691 		err = 0;
1692 		break;
1693 	case ISCSI_SESSION_FAILED:
1694 		err = DID_IMM_RETRY << 16;
1695 		break;
1696 	case ISCSI_SESSION_FREE:
1697 		err = DID_TRANSPORT_FAILFAST << 16;
1698 		break;
1699 	default:
1700 		err = DID_NO_CONNECT << 16;
1701 		break;
1702 	}
1703 	spin_unlock_irqrestore(&session->lock, flags);
1704 	return err;
1705 }
1706 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1707 
1708 int iscsi_is_session_online(struct iscsi_cls_session *session)
1709 {
1710 	unsigned long flags;
1711 	int ret = 0;
1712 
1713 	spin_lock_irqsave(&session->lock, flags);
1714 	if (session->state == ISCSI_SESSION_LOGGED_IN)
1715 		ret = 1;
1716 	spin_unlock_irqrestore(&session->lock, flags);
1717 	return ret;
1718 }
1719 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1720 
1721 static void iscsi_session_release(struct device *dev)
1722 {
1723 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1724 	struct Scsi_Host *shost;
1725 
1726 	shost = iscsi_session_to_shost(session);
1727 	scsi_host_put(shost);
1728 	ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1729 	kfree(session);
1730 }
1731 
1732 int iscsi_is_session_dev(const struct device *dev)
1733 {
1734 	return dev->release == iscsi_session_release;
1735 }
1736 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1737 
1738 static int iscsi_iter_session_fn(struct device *dev, void *data)
1739 {
1740 	void (* fn) (struct iscsi_cls_session *) = data;
1741 
1742 	if (!iscsi_is_session_dev(dev))
1743 		return 0;
1744 	fn(iscsi_dev_to_session(dev));
1745 	return 0;
1746 }
1747 
1748 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1749 				 void (*fn)(struct iscsi_cls_session *))
1750 {
1751 	device_for_each_child(&shost->shost_gendev, fn,
1752 			      iscsi_iter_session_fn);
1753 }
1754 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1755 
1756 /**
1757  * iscsi_scan_finished - helper to report when running scans are done
1758  * @shost: scsi host
1759  * @time: scan run time
1760  *
1761  * This function can be used by drives like qla4xxx to report to the scsi
1762  * layer when the scans it kicked off at module load time are done.
1763  */
1764 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1765 {
1766 	struct iscsi_cls_host *ihost = shost->shost_data;
1767 	/*
1768 	 * qla4xxx will have kicked off some session unblocks before calling
1769 	 * scsi_scan_host, so just wait for them to complete.
1770 	 */
1771 	return !atomic_read(&ihost->nr_scans);
1772 }
1773 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1774 
1775 struct iscsi_scan_data {
1776 	unsigned int channel;
1777 	unsigned int id;
1778 	u64 lun;
1779 	enum scsi_scan_mode rescan;
1780 };
1781 
1782 static int iscsi_user_scan_session(struct device *dev, void *data)
1783 {
1784 	struct iscsi_scan_data *scan_data = data;
1785 	struct iscsi_cls_session *session;
1786 	struct Scsi_Host *shost;
1787 	struct iscsi_cls_host *ihost;
1788 	unsigned long flags;
1789 	unsigned int id;
1790 
1791 	if (!iscsi_is_session_dev(dev))
1792 		return 0;
1793 
1794 	session = iscsi_dev_to_session(dev);
1795 
1796 	ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1797 
1798 	shost = iscsi_session_to_shost(session);
1799 	ihost = shost->shost_data;
1800 
1801 	mutex_lock(&ihost->mutex);
1802 	spin_lock_irqsave(&session->lock, flags);
1803 	if (session->state != ISCSI_SESSION_LOGGED_IN) {
1804 		spin_unlock_irqrestore(&session->lock, flags);
1805 		goto user_scan_exit;
1806 	}
1807 	id = session->target_id;
1808 	spin_unlock_irqrestore(&session->lock, flags);
1809 
1810 	if (id != ISCSI_MAX_TARGET) {
1811 		if ((scan_data->channel == SCAN_WILD_CARD ||
1812 		     scan_data->channel == 0) &&
1813 		    (scan_data->id == SCAN_WILD_CARD ||
1814 		     scan_data->id == id))
1815 			scsi_scan_target(&session->dev, 0, id,
1816 					 scan_data->lun, scan_data->rescan);
1817 	}
1818 
1819 user_scan_exit:
1820 	mutex_unlock(&ihost->mutex);
1821 	ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1822 	return 0;
1823 }
1824 
1825 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1826 			   uint id, u64 lun)
1827 {
1828 	struct iscsi_scan_data scan_data;
1829 
1830 	scan_data.channel = channel;
1831 	scan_data.id = id;
1832 	scan_data.lun = lun;
1833 	scan_data.rescan = SCSI_SCAN_MANUAL;
1834 
1835 	return device_for_each_child(&shost->shost_gendev, &scan_data,
1836 				     iscsi_user_scan_session);
1837 }
1838 
1839 static void iscsi_scan_session(struct work_struct *work)
1840 {
1841 	struct iscsi_cls_session *session =
1842 			container_of(work, struct iscsi_cls_session, scan_work);
1843 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
1844 	struct iscsi_cls_host *ihost = shost->shost_data;
1845 	struct iscsi_scan_data scan_data;
1846 
1847 	scan_data.channel = 0;
1848 	scan_data.id = SCAN_WILD_CARD;
1849 	scan_data.lun = SCAN_WILD_CARD;
1850 	scan_data.rescan = SCSI_SCAN_RESCAN;
1851 
1852 	iscsi_user_scan_session(&session->dev, &scan_data);
1853 	atomic_dec(&ihost->nr_scans);
1854 }
1855 
1856 /**
1857  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1858  * @cmd: scsi cmd passed to scsi eh handler
1859  *
1860  * If the session is down this function will wait for the recovery
1861  * timer to fire or for the session to be logged back in. If the
1862  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1863  * should pass this error value to the scsi eh.
1864  */
1865 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1866 {
1867 	struct iscsi_cls_session *session =
1868 			starget_to_session(scsi_target(cmd->device));
1869 	unsigned long flags;
1870 	int ret = 0;
1871 
1872 	spin_lock_irqsave(&session->lock, flags);
1873 	while (session->state != ISCSI_SESSION_LOGGED_IN) {
1874 		if (session->state == ISCSI_SESSION_FREE) {
1875 			ret = FAST_IO_FAIL;
1876 			break;
1877 		}
1878 		spin_unlock_irqrestore(&session->lock, flags);
1879 		msleep(1000);
1880 		spin_lock_irqsave(&session->lock, flags);
1881 	}
1882 	spin_unlock_irqrestore(&session->lock, flags);
1883 	return ret;
1884 }
1885 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1886 
1887 static void session_recovery_timedout(struct work_struct *work)
1888 {
1889 	struct iscsi_cls_session *session =
1890 		container_of(work, struct iscsi_cls_session,
1891 			     recovery_work.work);
1892 	unsigned long flags;
1893 
1894 	iscsi_cls_session_printk(KERN_INFO, session,
1895 				 "session recovery timed out after %d secs\n",
1896 				 session->recovery_tmo);
1897 
1898 	spin_lock_irqsave(&session->lock, flags);
1899 	switch (session->state) {
1900 	case ISCSI_SESSION_FAILED:
1901 		session->state = ISCSI_SESSION_FREE;
1902 		break;
1903 	case ISCSI_SESSION_LOGGED_IN:
1904 	case ISCSI_SESSION_FREE:
1905 		/* we raced with the unblock's flush */
1906 		spin_unlock_irqrestore(&session->lock, flags);
1907 		return;
1908 	}
1909 	spin_unlock_irqrestore(&session->lock, flags);
1910 
1911 	if (session->transport->session_recovery_timedout)
1912 		session->transport->session_recovery_timedout(session);
1913 
1914 	ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1915 	scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1916 	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1917 }
1918 
1919 static void __iscsi_unblock_session(struct work_struct *work)
1920 {
1921 	struct iscsi_cls_session *session =
1922 			container_of(work, struct iscsi_cls_session,
1923 				     unblock_work);
1924 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
1925 	struct iscsi_cls_host *ihost = shost->shost_data;
1926 	unsigned long flags;
1927 
1928 	ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1929 	/*
1930 	 * The recovery and unblock work get run from the same workqueue,
1931 	 * so try to cancel it if it was going to run after this unblock.
1932 	 */
1933 	cancel_delayed_work(&session->recovery_work);
1934 	spin_lock_irqsave(&session->lock, flags);
1935 	session->state = ISCSI_SESSION_LOGGED_IN;
1936 	spin_unlock_irqrestore(&session->lock, flags);
1937 	/* start IO */
1938 	scsi_target_unblock(&session->dev, SDEV_RUNNING);
1939 	/*
1940 	 * Only do kernel scanning if the driver is properly hooked into
1941 	 * the async scanning code (drivers like iscsi_tcp do login and
1942 	 * scanning from userspace).
1943 	 */
1944 	if (shost->hostt->scan_finished) {
1945 		if (scsi_queue_work(shost, &session->scan_work))
1946 			atomic_inc(&ihost->nr_scans);
1947 	}
1948 	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1949 }
1950 
1951 /**
1952  * iscsi_unblock_session - set a session as logged in and start IO.
1953  * @session: iscsi session
1954  *
1955  * Mark a session as ready to accept IO.
1956  */
1957 void iscsi_unblock_session(struct iscsi_cls_session *session)
1958 {
1959 	queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1960 	/*
1961 	 * make sure all the events have completed before tell the driver
1962 	 * it is safe
1963 	 */
1964 	flush_workqueue(iscsi_eh_timer_workq);
1965 }
1966 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1967 
1968 static void __iscsi_block_session(struct work_struct *work)
1969 {
1970 	struct iscsi_cls_session *session =
1971 			container_of(work, struct iscsi_cls_session,
1972 				     block_work);
1973 	unsigned long flags;
1974 
1975 	ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1976 	spin_lock_irqsave(&session->lock, flags);
1977 	session->state = ISCSI_SESSION_FAILED;
1978 	spin_unlock_irqrestore(&session->lock, flags);
1979 	scsi_target_block(&session->dev);
1980 	ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1981 	if (session->recovery_tmo >= 0)
1982 		queue_delayed_work(iscsi_eh_timer_workq,
1983 				   &session->recovery_work,
1984 				   session->recovery_tmo * HZ);
1985 }
1986 
1987 void iscsi_block_session(struct iscsi_cls_session *session)
1988 {
1989 	queue_work(iscsi_eh_timer_workq, &session->block_work);
1990 }
1991 EXPORT_SYMBOL_GPL(iscsi_block_session);
1992 
1993 static void __iscsi_unbind_session(struct work_struct *work)
1994 {
1995 	struct iscsi_cls_session *session =
1996 			container_of(work, struct iscsi_cls_session,
1997 				     unbind_work);
1998 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
1999 	struct iscsi_cls_host *ihost = shost->shost_data;
2000 	unsigned long flags;
2001 	unsigned int target_id;
2002 
2003 	ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2004 
2005 	/* Prevent new scans and make sure scanning is not in progress */
2006 	mutex_lock(&ihost->mutex);
2007 	spin_lock_irqsave(&session->lock, flags);
2008 	if (session->target_id == ISCSI_MAX_TARGET) {
2009 		spin_unlock_irqrestore(&session->lock, flags);
2010 		mutex_unlock(&ihost->mutex);
2011 		return;
2012 	}
2013 
2014 	target_id = session->target_id;
2015 	session->target_id = ISCSI_MAX_TARGET;
2016 	spin_unlock_irqrestore(&session->lock, flags);
2017 	mutex_unlock(&ihost->mutex);
2018 
2019 	if (session->ida_used)
2020 		ida_simple_remove(&iscsi_sess_ida, target_id);
2021 
2022 	scsi_remove_target(&session->dev);
2023 	iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2024 	ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2025 }
2026 
2027 struct iscsi_cls_session *
2028 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2029 		    int dd_size)
2030 {
2031 	struct iscsi_cls_session *session;
2032 
2033 	session = kzalloc(sizeof(*session) + dd_size,
2034 			  GFP_KERNEL);
2035 	if (!session)
2036 		return NULL;
2037 
2038 	session->transport = transport;
2039 	session->creator = -1;
2040 	session->recovery_tmo = 120;
2041 	session->recovery_tmo_sysfs_override = false;
2042 	session->state = ISCSI_SESSION_FREE;
2043 	INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2044 	INIT_LIST_HEAD(&session->sess_list);
2045 	INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2046 	INIT_WORK(&session->block_work, __iscsi_block_session);
2047 	INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2048 	INIT_WORK(&session->scan_work, iscsi_scan_session);
2049 	spin_lock_init(&session->lock);
2050 
2051 	/* this is released in the dev's release function */
2052 	scsi_host_get(shost);
2053 	session->dev.parent = &shost->shost_gendev;
2054 	session->dev.release = iscsi_session_release;
2055 	device_initialize(&session->dev);
2056 	if (dd_size)
2057 		session->dd_data = &session[1];
2058 
2059 	ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2060 	return session;
2061 }
2062 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2063 
2064 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2065 {
2066 	unsigned long flags;
2067 	int id = 0;
2068 	int err;
2069 
2070 	session->sid = atomic_add_return(1, &iscsi_session_nr);
2071 
2072 	if (target_id == ISCSI_MAX_TARGET) {
2073 		id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2074 
2075 		if (id < 0) {
2076 			iscsi_cls_session_printk(KERN_ERR, session,
2077 					"Failure in Target ID Allocation\n");
2078 			return id;
2079 		}
2080 		session->target_id = (unsigned int)id;
2081 		session->ida_used = true;
2082 	} else
2083 		session->target_id = target_id;
2084 
2085 	dev_set_name(&session->dev, "session%u", session->sid);
2086 	err = device_add(&session->dev);
2087 	if (err) {
2088 		iscsi_cls_session_printk(KERN_ERR, session,
2089 					 "could not register session's dev\n");
2090 		goto release_ida;
2091 	}
2092 	transport_register_device(&session->dev);
2093 
2094 	spin_lock_irqsave(&sesslock, flags);
2095 	list_add(&session->sess_list, &sesslist);
2096 	spin_unlock_irqrestore(&sesslock, flags);
2097 
2098 	iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2099 	ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2100 	return 0;
2101 
2102 release_ida:
2103 	if (session->ida_used)
2104 		ida_simple_remove(&iscsi_sess_ida, session->target_id);
2105 
2106 	return err;
2107 }
2108 EXPORT_SYMBOL_GPL(iscsi_add_session);
2109 
2110 /**
2111  * iscsi_create_session - create iscsi class session
2112  * @shost: scsi host
2113  * @transport: iscsi transport
2114  * @dd_size: private driver data size
2115  * @target_id: which target
2116  *
2117  * This can be called from a LLD or iscsi_transport.
2118  */
2119 struct iscsi_cls_session *
2120 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2121 		     int dd_size, unsigned int target_id)
2122 {
2123 	struct iscsi_cls_session *session;
2124 
2125 	session = iscsi_alloc_session(shost, transport, dd_size);
2126 	if (!session)
2127 		return NULL;
2128 
2129 	if (iscsi_add_session(session, target_id)) {
2130 		iscsi_free_session(session);
2131 		return NULL;
2132 	}
2133 	return session;
2134 }
2135 EXPORT_SYMBOL_GPL(iscsi_create_session);
2136 
2137 static void iscsi_conn_release(struct device *dev)
2138 {
2139 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2140 	struct device *parent = conn->dev.parent;
2141 
2142 	ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2143 	kfree(conn);
2144 	put_device(parent);
2145 }
2146 
2147 static int iscsi_is_conn_dev(const struct device *dev)
2148 {
2149 	return dev->release == iscsi_conn_release;
2150 }
2151 
2152 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2153 {
2154 	if (!iscsi_is_conn_dev(dev))
2155 		return 0;
2156 	return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2157 }
2158 
2159 void iscsi_remove_session(struct iscsi_cls_session *session)
2160 {
2161 	unsigned long flags;
2162 	int err;
2163 
2164 	ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2165 
2166 	spin_lock_irqsave(&sesslock, flags);
2167 	list_del(&session->sess_list);
2168 	spin_unlock_irqrestore(&sesslock, flags);
2169 
2170 	/* make sure there are no blocks/unblocks queued */
2171 	flush_workqueue(iscsi_eh_timer_workq);
2172 	/* make sure the timedout callout is not running */
2173 	if (!cancel_delayed_work(&session->recovery_work))
2174 		flush_workqueue(iscsi_eh_timer_workq);
2175 	/*
2176 	 * If we are blocked let commands flow again. The lld or iscsi
2177 	 * layer should set up the queuecommand to fail commands.
2178 	 * We assume that LLD will not be calling block/unblock while
2179 	 * removing the session.
2180 	 */
2181 	spin_lock_irqsave(&session->lock, flags);
2182 	session->state = ISCSI_SESSION_FREE;
2183 	spin_unlock_irqrestore(&session->lock, flags);
2184 
2185 	scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2186 	/* flush running scans then delete devices */
2187 	flush_work(&session->scan_work);
2188 	__iscsi_unbind_session(&session->unbind_work);
2189 
2190 	/* hw iscsi may not have removed all connections from session */
2191 	err = device_for_each_child(&session->dev, NULL,
2192 				    iscsi_iter_destroy_conn_fn);
2193 	if (err)
2194 		iscsi_cls_session_printk(KERN_ERR, session,
2195 					 "Could not delete all connections "
2196 					 "for session. Error %d.\n", err);
2197 
2198 	transport_unregister_device(&session->dev);
2199 
2200 	ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2201 	device_del(&session->dev);
2202 }
2203 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2204 
2205 void iscsi_free_session(struct iscsi_cls_session *session)
2206 {
2207 	ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2208 	iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2209 	put_device(&session->dev);
2210 }
2211 EXPORT_SYMBOL_GPL(iscsi_free_session);
2212 
2213 /**
2214  * iscsi_create_conn - create iscsi class connection
2215  * @session: iscsi cls session
2216  * @dd_size: private driver data size
2217  * @cid: connection id
2218  *
2219  * This can be called from a LLD or iscsi_transport. The connection
2220  * is child of the session so cid must be unique for all connections
2221  * on the session.
2222  *
2223  * Since we do not support MCS, cid will normally be zero. In some cases
2224  * for software iscsi we could be trying to preallocate a connection struct
2225  * in which case there could be two connection structs and cid would be
2226  * non-zero.
2227  */
2228 struct iscsi_cls_conn *
2229 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2230 {
2231 	struct iscsi_transport *transport = session->transport;
2232 	struct iscsi_cls_conn *conn;
2233 	unsigned long flags;
2234 	int err;
2235 
2236 	conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2237 	if (!conn)
2238 		return NULL;
2239 	if (dd_size)
2240 		conn->dd_data = &conn[1];
2241 
2242 	mutex_init(&conn->ep_mutex);
2243 	INIT_LIST_HEAD(&conn->conn_list);
2244 	conn->transport = transport;
2245 	conn->cid = cid;
2246 
2247 	/* this is released in the dev's release function */
2248 	if (!get_device(&session->dev))
2249 		goto free_conn;
2250 
2251 	dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2252 	conn->dev.parent = &session->dev;
2253 	conn->dev.release = iscsi_conn_release;
2254 	err = device_register(&conn->dev);
2255 	if (err) {
2256 		iscsi_cls_session_printk(KERN_ERR, session, "could not "
2257 					 "register connection's dev\n");
2258 		goto release_parent_ref;
2259 	}
2260 	transport_register_device(&conn->dev);
2261 
2262 	spin_lock_irqsave(&connlock, flags);
2263 	list_add(&conn->conn_list, &connlist);
2264 	spin_unlock_irqrestore(&connlock, flags);
2265 
2266 	ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2267 	return conn;
2268 
2269 release_parent_ref:
2270 	put_device(&session->dev);
2271 free_conn:
2272 	kfree(conn);
2273 	return NULL;
2274 }
2275 
2276 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2277 
2278 /**
2279  * iscsi_destroy_conn - destroy iscsi class connection
2280  * @conn: iscsi cls session
2281  *
2282  * This can be called from a LLD or iscsi_transport.
2283  */
2284 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2285 {
2286 	unsigned long flags;
2287 
2288 	spin_lock_irqsave(&connlock, flags);
2289 	list_del(&conn->conn_list);
2290 	spin_unlock_irqrestore(&connlock, flags);
2291 
2292 	transport_unregister_device(&conn->dev);
2293 	ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2294 	device_unregister(&conn->dev);
2295 	return 0;
2296 }
2297 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2298 
2299 /*
2300  * iscsi interface functions
2301  */
2302 static struct iscsi_internal *
2303 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2304 {
2305 	struct iscsi_internal *priv;
2306 	unsigned long flags;
2307 
2308 	spin_lock_irqsave(&iscsi_transport_lock, flags);
2309 	list_for_each_entry(priv, &iscsi_transports, list) {
2310 		if (tt == priv->iscsi_transport) {
2311 			spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2312 			return priv;
2313 		}
2314 	}
2315 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2316 	return NULL;
2317 }
2318 
2319 static int
2320 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2321 {
2322 	return nlmsg_multicast(nls, skb, 0, group, gfp);
2323 }
2324 
2325 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2326 		   char *data, uint32_t data_size)
2327 {
2328 	struct nlmsghdr	*nlh;
2329 	struct sk_buff *skb;
2330 	struct iscsi_uevent *ev;
2331 	char *pdu;
2332 	struct iscsi_internal *priv;
2333 	int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2334 				   data_size);
2335 
2336 	priv = iscsi_if_transport_lookup(conn->transport);
2337 	if (!priv)
2338 		return -EINVAL;
2339 
2340 	skb = alloc_skb(len, GFP_ATOMIC);
2341 	if (!skb) {
2342 		iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2343 		iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2344 				      "control PDU: OOM\n");
2345 		return -ENOMEM;
2346 	}
2347 
2348 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2349 	ev = nlmsg_data(nlh);
2350 	memset(ev, 0, sizeof(*ev));
2351 	ev->transport_handle = iscsi_handle(conn->transport);
2352 	ev->type = ISCSI_KEVENT_RECV_PDU;
2353 	ev->r.recv_req.cid = conn->cid;
2354 	ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2355 	pdu = (char*)ev + sizeof(*ev);
2356 	memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2357 	memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2358 
2359 	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2360 }
2361 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2362 
2363 int iscsi_offload_mesg(struct Scsi_Host *shost,
2364 		       struct iscsi_transport *transport, uint32_t type,
2365 		       char *data, uint16_t data_size)
2366 {
2367 	struct nlmsghdr	*nlh;
2368 	struct sk_buff *skb;
2369 	struct iscsi_uevent *ev;
2370 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2371 
2372 	skb = alloc_skb(len, GFP_ATOMIC);
2373 	if (!skb) {
2374 		printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2375 		return -ENOMEM;
2376 	}
2377 
2378 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2379 	ev = nlmsg_data(nlh);
2380 	memset(ev, 0, sizeof(*ev));
2381 	ev->type = type;
2382 	ev->transport_handle = iscsi_handle(transport);
2383 	switch (type) {
2384 	case ISCSI_KEVENT_PATH_REQ:
2385 		ev->r.req_path.host_no = shost->host_no;
2386 		break;
2387 	case ISCSI_KEVENT_IF_DOWN:
2388 		ev->r.notify_if_down.host_no = shost->host_no;
2389 		break;
2390 	}
2391 
2392 	memcpy((char *)ev + sizeof(*ev), data, data_size);
2393 
2394 	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2395 }
2396 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2397 
2398 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2399 {
2400 	struct nlmsghdr	*nlh;
2401 	struct sk_buff	*skb;
2402 	struct iscsi_uevent *ev;
2403 	struct iscsi_internal *priv;
2404 	int len = nlmsg_total_size(sizeof(*ev));
2405 
2406 	priv = iscsi_if_transport_lookup(conn->transport);
2407 	if (!priv)
2408 		return;
2409 
2410 	skb = alloc_skb(len, GFP_ATOMIC);
2411 	if (!skb) {
2412 		iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2413 				      "conn error (%d)\n", error);
2414 		return;
2415 	}
2416 
2417 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2418 	ev = nlmsg_data(nlh);
2419 	ev->transport_handle = iscsi_handle(conn->transport);
2420 	ev->type = ISCSI_KEVENT_CONN_ERROR;
2421 	ev->r.connerror.error = error;
2422 	ev->r.connerror.cid = conn->cid;
2423 	ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2424 
2425 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2426 
2427 	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2428 			      error);
2429 }
2430 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2431 
2432 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2433 			    enum iscsi_conn_state state)
2434 {
2435 	struct nlmsghdr *nlh;
2436 	struct sk_buff  *skb;
2437 	struct iscsi_uevent *ev;
2438 	struct iscsi_internal *priv;
2439 	int len = nlmsg_total_size(sizeof(*ev));
2440 
2441 	priv = iscsi_if_transport_lookup(conn->transport);
2442 	if (!priv)
2443 		return;
2444 
2445 	skb = alloc_skb(len, GFP_ATOMIC);
2446 	if (!skb) {
2447 		iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2448 				      "conn login (%d)\n", state);
2449 		return;
2450 	}
2451 
2452 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2453 	ev = nlmsg_data(nlh);
2454 	ev->transport_handle = iscsi_handle(conn->transport);
2455 	ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2456 	ev->r.conn_login.state = state;
2457 	ev->r.conn_login.cid = conn->cid;
2458 	ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2459 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2460 
2461 	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2462 			      state);
2463 }
2464 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2465 
2466 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2467 			   enum iscsi_host_event_code code, uint32_t data_size,
2468 			   uint8_t *data)
2469 {
2470 	struct nlmsghdr *nlh;
2471 	struct sk_buff *skb;
2472 	struct iscsi_uevent *ev;
2473 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2474 
2475 	skb = alloc_skb(len, GFP_NOIO);
2476 	if (!skb) {
2477 		printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2478 		       host_no, code);
2479 		return;
2480 	}
2481 
2482 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2483 	ev = nlmsg_data(nlh);
2484 	ev->transport_handle = iscsi_handle(transport);
2485 	ev->type = ISCSI_KEVENT_HOST_EVENT;
2486 	ev->r.host_event.host_no = host_no;
2487 	ev->r.host_event.code = code;
2488 	ev->r.host_event.data_size = data_size;
2489 
2490 	if (data_size)
2491 		memcpy((char *)ev + sizeof(*ev), data, data_size);
2492 
2493 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2494 }
2495 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2496 
2497 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2498 			   uint32_t status, uint32_t pid, uint32_t data_size,
2499 			   uint8_t *data)
2500 {
2501 	struct nlmsghdr *nlh;
2502 	struct sk_buff *skb;
2503 	struct iscsi_uevent *ev;
2504 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2505 
2506 	skb = alloc_skb(len, GFP_NOIO);
2507 	if (!skb) {
2508 		printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2509 		return;
2510 	}
2511 
2512 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2513 	ev = nlmsg_data(nlh);
2514 	ev->transport_handle = iscsi_handle(transport);
2515 	ev->type = ISCSI_KEVENT_PING_COMP;
2516 	ev->r.ping_comp.host_no = host_no;
2517 	ev->r.ping_comp.status = status;
2518 	ev->r.ping_comp.pid = pid;
2519 	ev->r.ping_comp.data_size = data_size;
2520 	memcpy((char *)ev + sizeof(*ev), data, data_size);
2521 
2522 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2523 }
2524 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2525 
2526 static int
2527 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
2528 		    void *payload, int size)
2529 {
2530 	struct sk_buff	*skb;
2531 	struct nlmsghdr	*nlh;
2532 	int len = nlmsg_total_size(size);
2533 	int flags = multi ? NLM_F_MULTI : 0;
2534 	int t = done ? NLMSG_DONE : type;
2535 
2536 	skb = alloc_skb(len, GFP_ATOMIC);
2537 	if (!skb) {
2538 		printk(KERN_ERR "Could not allocate skb to send reply.\n");
2539 		return -ENOMEM;
2540 	}
2541 
2542 	nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
2543 	nlh->nlmsg_flags = flags;
2544 	memcpy(nlmsg_data(nlh), payload, size);
2545 	return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
2546 }
2547 
2548 static int
2549 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2550 {
2551 	struct iscsi_uevent *ev = nlmsg_data(nlh);
2552 	struct iscsi_stats *stats;
2553 	struct sk_buff *skbstat;
2554 	struct iscsi_cls_conn *conn;
2555 	struct nlmsghdr	*nlhstat;
2556 	struct iscsi_uevent *evstat;
2557 	struct iscsi_internal *priv;
2558 	int len = nlmsg_total_size(sizeof(*ev) +
2559 				   sizeof(struct iscsi_stats) +
2560 				   sizeof(struct iscsi_stats_custom) *
2561 				   ISCSI_STATS_CUSTOM_MAX);
2562 	int err = 0;
2563 
2564 	priv = iscsi_if_transport_lookup(transport);
2565 	if (!priv)
2566 		return -EINVAL;
2567 
2568 	conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2569 	if (!conn)
2570 		return -EEXIST;
2571 
2572 	do {
2573 		int actual_size;
2574 
2575 		skbstat = alloc_skb(len, GFP_ATOMIC);
2576 		if (!skbstat) {
2577 			iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2578 					      "deliver stats: OOM\n");
2579 			return -ENOMEM;
2580 		}
2581 
2582 		nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2583 				      (len - sizeof(*nlhstat)), 0);
2584 		evstat = nlmsg_data(nlhstat);
2585 		memset(evstat, 0, sizeof(*evstat));
2586 		evstat->transport_handle = iscsi_handle(conn->transport);
2587 		evstat->type = nlh->nlmsg_type;
2588 		evstat->u.get_stats.cid =
2589 			ev->u.get_stats.cid;
2590 		evstat->u.get_stats.sid =
2591 			ev->u.get_stats.sid;
2592 		stats = (struct iscsi_stats *)
2593 			((char*)evstat + sizeof(*evstat));
2594 		memset(stats, 0, sizeof(*stats));
2595 
2596 		transport->get_stats(conn, stats);
2597 		actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2598 					       sizeof(struct iscsi_stats) +
2599 					       sizeof(struct iscsi_stats_custom) *
2600 					       stats->custom_length);
2601 		actual_size -= sizeof(*nlhstat);
2602 		actual_size = nlmsg_msg_size(actual_size);
2603 		skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2604 		nlhstat->nlmsg_len = actual_size;
2605 
2606 		err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2607 					  GFP_ATOMIC);
2608 	} while (err < 0 && err != -ECONNREFUSED);
2609 
2610 	return err;
2611 }
2612 
2613 /**
2614  * iscsi_session_event - send session destr. completion event
2615  * @session: iscsi class session
2616  * @event: type of event
2617  */
2618 int iscsi_session_event(struct iscsi_cls_session *session,
2619 			enum iscsi_uevent_e event)
2620 {
2621 	struct iscsi_internal *priv;
2622 	struct Scsi_Host *shost;
2623 	struct iscsi_uevent *ev;
2624 	struct sk_buff  *skb;
2625 	struct nlmsghdr *nlh;
2626 	int rc, len = nlmsg_total_size(sizeof(*ev));
2627 
2628 	priv = iscsi_if_transport_lookup(session->transport);
2629 	if (!priv)
2630 		return -EINVAL;
2631 	shost = iscsi_session_to_shost(session);
2632 
2633 	skb = alloc_skb(len, GFP_KERNEL);
2634 	if (!skb) {
2635 		iscsi_cls_session_printk(KERN_ERR, session,
2636 					 "Cannot notify userspace of session "
2637 					 "event %u\n", event);
2638 		return -ENOMEM;
2639 	}
2640 
2641 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2642 	ev = nlmsg_data(nlh);
2643 	ev->transport_handle = iscsi_handle(session->transport);
2644 
2645 	ev->type = event;
2646 	switch (event) {
2647 	case ISCSI_KEVENT_DESTROY_SESSION:
2648 		ev->r.d_session.host_no = shost->host_no;
2649 		ev->r.d_session.sid = session->sid;
2650 		break;
2651 	case ISCSI_KEVENT_CREATE_SESSION:
2652 		ev->r.c_session_ret.host_no = shost->host_no;
2653 		ev->r.c_session_ret.sid = session->sid;
2654 		break;
2655 	case ISCSI_KEVENT_UNBIND_SESSION:
2656 		ev->r.unbind_session.host_no = shost->host_no;
2657 		ev->r.unbind_session.sid = session->sid;
2658 		break;
2659 	default:
2660 		iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2661 					 "%u.\n", event);
2662 		kfree_skb(skb);
2663 		return -EINVAL;
2664 	}
2665 
2666 	/*
2667 	 * this will occur if the daemon is not up, so we just warn
2668 	 * the user and when the daemon is restarted it will handle it
2669 	 */
2670 	rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2671 	if (rc == -ESRCH)
2672 		iscsi_cls_session_printk(KERN_ERR, session,
2673 					 "Cannot notify userspace of session "
2674 					 "event %u. Check iscsi daemon\n",
2675 					 event);
2676 
2677 	ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2678 				event, rc);
2679 	return rc;
2680 }
2681 EXPORT_SYMBOL_GPL(iscsi_session_event);
2682 
2683 static int
2684 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2685 			struct iscsi_uevent *ev, pid_t pid,
2686 			uint32_t initial_cmdsn,	uint16_t cmds_max,
2687 			uint16_t queue_depth)
2688 {
2689 	struct iscsi_transport *transport = priv->iscsi_transport;
2690 	struct iscsi_cls_session *session;
2691 	struct Scsi_Host *shost;
2692 
2693 	session = transport->create_session(ep, cmds_max, queue_depth,
2694 					    initial_cmdsn);
2695 	if (!session)
2696 		return -ENOMEM;
2697 
2698 	session->creator = pid;
2699 	shost = iscsi_session_to_shost(session);
2700 	ev->r.c_session_ret.host_no = shost->host_no;
2701 	ev->r.c_session_ret.sid = session->sid;
2702 	ISCSI_DBG_TRANS_SESSION(session,
2703 				"Completed creating transport session\n");
2704 	return 0;
2705 }
2706 
2707 static int
2708 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2709 {
2710 	struct iscsi_cls_conn *conn;
2711 	struct iscsi_cls_session *session;
2712 
2713 	session = iscsi_session_lookup(ev->u.c_conn.sid);
2714 	if (!session) {
2715 		printk(KERN_ERR "iscsi: invalid session %d.\n",
2716 		       ev->u.c_conn.sid);
2717 		return -EINVAL;
2718 	}
2719 
2720 	conn = transport->create_conn(session, ev->u.c_conn.cid);
2721 	if (!conn) {
2722 		iscsi_cls_session_printk(KERN_ERR, session,
2723 					 "couldn't create a new connection.");
2724 		return -ENOMEM;
2725 	}
2726 
2727 	ev->r.c_conn_ret.sid = session->sid;
2728 	ev->r.c_conn_ret.cid = conn->cid;
2729 
2730 	ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2731 	return 0;
2732 }
2733 
2734 static int
2735 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2736 {
2737 	struct iscsi_cls_conn *conn;
2738 
2739 	conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2740 	if (!conn)
2741 		return -EINVAL;
2742 
2743 	ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2744 	if (transport->destroy_conn)
2745 		transport->destroy_conn(conn);
2746 
2747 	return 0;
2748 }
2749 
2750 static int
2751 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2752 {
2753 	char *data = (char*)ev + sizeof(*ev);
2754 	struct iscsi_cls_conn *conn;
2755 	struct iscsi_cls_session *session;
2756 	int err = 0, value = 0;
2757 
2758 	session = iscsi_session_lookup(ev->u.set_param.sid);
2759 	conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2760 	if (!conn || !session)
2761 		return -EINVAL;
2762 
2763 	switch (ev->u.set_param.param) {
2764 	case ISCSI_PARAM_SESS_RECOVERY_TMO:
2765 		sscanf(data, "%d", &value);
2766 		if (!session->recovery_tmo_sysfs_override)
2767 			session->recovery_tmo = value;
2768 		break;
2769 	default:
2770 		err = transport->set_param(conn, ev->u.set_param.param,
2771 					   data, ev->u.set_param.len);
2772 	}
2773 
2774 	return err;
2775 }
2776 
2777 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2778 			       struct iscsi_uevent *ev, int msg_type)
2779 {
2780 	struct iscsi_endpoint *ep;
2781 	struct sockaddr *dst_addr;
2782 	struct Scsi_Host *shost = NULL;
2783 	int non_blocking, err = 0;
2784 
2785 	if (!transport->ep_connect)
2786 		return -EINVAL;
2787 
2788 	if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2789 		shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2790 		if (!shost) {
2791 			printk(KERN_ERR "ep connect failed. Could not find "
2792 			       "host no %u\n",
2793 			       ev->u.ep_connect_through_host.host_no);
2794 			return -ENODEV;
2795 		}
2796 		non_blocking = ev->u.ep_connect_through_host.non_blocking;
2797 	} else
2798 		non_blocking = ev->u.ep_connect.non_blocking;
2799 
2800 	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2801 	ep = transport->ep_connect(shost, dst_addr, non_blocking);
2802 	if (IS_ERR(ep)) {
2803 		err = PTR_ERR(ep);
2804 		goto release_host;
2805 	}
2806 
2807 	ev->r.ep_connect_ret.handle = ep->id;
2808 release_host:
2809 	if (shost)
2810 		scsi_host_put(shost);
2811 	return err;
2812 }
2813 
2814 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2815 				  u64 ep_handle)
2816 {
2817 	struct iscsi_cls_conn *conn;
2818 	struct iscsi_endpoint *ep;
2819 
2820 	if (!transport->ep_disconnect)
2821 		return -EINVAL;
2822 
2823 	ep = iscsi_lookup_endpoint(ep_handle);
2824 	if (!ep)
2825 		return -EINVAL;
2826 	conn = ep->conn;
2827 	if (conn) {
2828 		mutex_lock(&conn->ep_mutex);
2829 		conn->ep = NULL;
2830 		mutex_unlock(&conn->ep_mutex);
2831 	}
2832 
2833 	transport->ep_disconnect(ep);
2834 	return 0;
2835 }
2836 
2837 static int
2838 iscsi_if_transport_ep(struct iscsi_transport *transport,
2839 		      struct iscsi_uevent *ev, int msg_type)
2840 {
2841 	struct iscsi_endpoint *ep;
2842 	int rc = 0;
2843 
2844 	switch (msg_type) {
2845 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2846 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2847 		rc = iscsi_if_ep_connect(transport, ev, msg_type);
2848 		break;
2849 	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2850 		if (!transport->ep_poll)
2851 			return -EINVAL;
2852 
2853 		ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2854 		if (!ep)
2855 			return -EINVAL;
2856 
2857 		ev->r.retcode = transport->ep_poll(ep,
2858 						   ev->u.ep_poll.timeout_ms);
2859 		break;
2860 	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2861 		rc = iscsi_if_ep_disconnect(transport,
2862 					    ev->u.ep_disconnect.ep_handle);
2863 		break;
2864 	}
2865 	return rc;
2866 }
2867 
2868 static int
2869 iscsi_tgt_dscvr(struct iscsi_transport *transport,
2870 		struct iscsi_uevent *ev)
2871 {
2872 	struct Scsi_Host *shost;
2873 	struct sockaddr *dst_addr;
2874 	int err;
2875 
2876 	if (!transport->tgt_dscvr)
2877 		return -EINVAL;
2878 
2879 	shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
2880 	if (!shost) {
2881 		printk(KERN_ERR "target discovery could not find host no %u\n",
2882 		       ev->u.tgt_dscvr.host_no);
2883 		return -ENODEV;
2884 	}
2885 
2886 
2887 	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2888 	err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
2889 				   ev->u.tgt_dscvr.enable, dst_addr);
2890 	scsi_host_put(shost);
2891 	return err;
2892 }
2893 
2894 static int
2895 iscsi_set_host_param(struct iscsi_transport *transport,
2896 		     struct iscsi_uevent *ev)
2897 {
2898 	char *data = (char*)ev + sizeof(*ev);
2899 	struct Scsi_Host *shost;
2900 	int err;
2901 
2902 	if (!transport->set_host_param)
2903 		return -ENOSYS;
2904 
2905 	shost = scsi_host_lookup(ev->u.set_host_param.host_no);
2906 	if (!shost) {
2907 		printk(KERN_ERR "set_host_param could not find host no %u\n",
2908 		       ev->u.set_host_param.host_no);
2909 		return -ENODEV;
2910 	}
2911 
2912 	err = transport->set_host_param(shost, ev->u.set_host_param.param,
2913 					data, ev->u.set_host_param.len);
2914 	scsi_host_put(shost);
2915 	return err;
2916 }
2917 
2918 static int
2919 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2920 {
2921 	struct Scsi_Host *shost;
2922 	struct iscsi_path *params;
2923 	int err;
2924 
2925 	if (!transport->set_path)
2926 		return -ENOSYS;
2927 
2928 	shost = scsi_host_lookup(ev->u.set_path.host_no);
2929 	if (!shost) {
2930 		printk(KERN_ERR "set path could not find host no %u\n",
2931 		       ev->u.set_path.host_no);
2932 		return -ENODEV;
2933 	}
2934 
2935 	params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
2936 	err = transport->set_path(shost, params);
2937 
2938 	scsi_host_put(shost);
2939 	return err;
2940 }
2941 
2942 static int
2943 iscsi_set_iface_params(struct iscsi_transport *transport,
2944 		       struct iscsi_uevent *ev, uint32_t len)
2945 {
2946 	char *data = (char *)ev + sizeof(*ev);
2947 	struct Scsi_Host *shost;
2948 	int err;
2949 
2950 	if (!transport->set_iface_param)
2951 		return -ENOSYS;
2952 
2953 	shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
2954 	if (!shost) {
2955 		printk(KERN_ERR "set_iface_params could not find host no %u\n",
2956 		       ev->u.set_iface_params.host_no);
2957 		return -ENODEV;
2958 	}
2959 
2960 	err = transport->set_iface_param(shost, data, len);
2961 	scsi_host_put(shost);
2962 	return err;
2963 }
2964 
2965 static int
2966 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2967 {
2968 	struct Scsi_Host *shost;
2969 	struct sockaddr *dst_addr;
2970 	int err;
2971 
2972 	if (!transport->send_ping)
2973 		return -ENOSYS;
2974 
2975 	shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
2976 	if (!shost) {
2977 		printk(KERN_ERR "iscsi_ping could not find host no %u\n",
2978 		       ev->u.iscsi_ping.host_no);
2979 		return -ENODEV;
2980 	}
2981 
2982 	dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
2983 	err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
2984 				   ev->u.iscsi_ping.iface_type,
2985 				   ev->u.iscsi_ping.payload_size,
2986 				   ev->u.iscsi_ping.pid,
2987 				   dst_addr);
2988 	scsi_host_put(shost);
2989 	return err;
2990 }
2991 
2992 static int
2993 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2994 {
2995 	struct iscsi_uevent *ev = nlmsg_data(nlh);
2996 	struct Scsi_Host *shost = NULL;
2997 	struct iscsi_chap_rec *chap_rec;
2998 	struct iscsi_internal *priv;
2999 	struct sk_buff *skbchap;
3000 	struct nlmsghdr *nlhchap;
3001 	struct iscsi_uevent *evchap;
3002 	uint32_t chap_buf_size;
3003 	int len, err = 0;
3004 	char *buf;
3005 
3006 	if (!transport->get_chap)
3007 		return -EINVAL;
3008 
3009 	priv = iscsi_if_transport_lookup(transport);
3010 	if (!priv)
3011 		return -EINVAL;
3012 
3013 	chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3014 	len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3015 
3016 	shost = scsi_host_lookup(ev->u.get_chap.host_no);
3017 	if (!shost) {
3018 		printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3019 		       __func__, ev->u.get_chap.host_no);
3020 		return -ENODEV;
3021 	}
3022 
3023 	do {
3024 		int actual_size;
3025 
3026 		skbchap = alloc_skb(len, GFP_KERNEL);
3027 		if (!skbchap) {
3028 			printk(KERN_ERR "can not deliver chap: OOM\n");
3029 			err = -ENOMEM;
3030 			goto exit_get_chap;
3031 		}
3032 
3033 		nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3034 				      (len - sizeof(*nlhchap)), 0);
3035 		evchap = nlmsg_data(nlhchap);
3036 		memset(evchap, 0, sizeof(*evchap));
3037 		evchap->transport_handle = iscsi_handle(transport);
3038 		evchap->type = nlh->nlmsg_type;
3039 		evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3040 		evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3041 		evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3042 		buf = (char *)evchap + sizeof(*evchap);
3043 		memset(buf, 0, chap_buf_size);
3044 
3045 		err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3046 				    &evchap->u.get_chap.num_entries, buf);
3047 
3048 		actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3049 		skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3050 		nlhchap->nlmsg_len = actual_size;
3051 
3052 		err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3053 					  GFP_KERNEL);
3054 	} while (err < 0 && err != -ECONNREFUSED);
3055 
3056 exit_get_chap:
3057 	scsi_host_put(shost);
3058 	return err;
3059 }
3060 
3061 static int iscsi_set_chap(struct iscsi_transport *transport,
3062 			  struct iscsi_uevent *ev, uint32_t len)
3063 {
3064 	char *data = (char *)ev + sizeof(*ev);
3065 	struct Scsi_Host *shost;
3066 	int err = 0;
3067 
3068 	if (!transport->set_chap)
3069 		return -ENOSYS;
3070 
3071 	shost = scsi_host_lookup(ev->u.set_path.host_no);
3072 	if (!shost) {
3073 		pr_err("%s could not find host no %u\n",
3074 		       __func__, ev->u.set_path.host_no);
3075 		return -ENODEV;
3076 	}
3077 
3078 	err = transport->set_chap(shost, data, len);
3079 	scsi_host_put(shost);
3080 	return err;
3081 }
3082 
3083 static int iscsi_delete_chap(struct iscsi_transport *transport,
3084 			     struct iscsi_uevent *ev)
3085 {
3086 	struct Scsi_Host *shost;
3087 	int err = 0;
3088 
3089 	if (!transport->delete_chap)
3090 		return -ENOSYS;
3091 
3092 	shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3093 	if (!shost) {
3094 		printk(KERN_ERR "%s could not find host no %u\n",
3095 		       __func__, ev->u.delete_chap.host_no);
3096 		return -ENODEV;
3097 	}
3098 
3099 	err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3100 	scsi_host_put(shost);
3101 	return err;
3102 }
3103 
3104 static const struct {
3105 	enum iscsi_discovery_parent_type value;
3106 	char				*name;
3107 } iscsi_discovery_parent_names[] = {
3108 	{ISCSI_DISC_PARENT_UNKNOWN,	"Unknown" },
3109 	{ISCSI_DISC_PARENT_SENDTGT,	"Sendtarget" },
3110 	{ISCSI_DISC_PARENT_ISNS,	"isns" },
3111 };
3112 
3113 char *iscsi_get_discovery_parent_name(int parent_type)
3114 {
3115 	int i;
3116 	char *state = "Unknown!";
3117 
3118 	for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3119 		if (iscsi_discovery_parent_names[i].value & parent_type) {
3120 			state = iscsi_discovery_parent_names[i].name;
3121 			break;
3122 		}
3123 	}
3124 	return state;
3125 }
3126 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3127 
3128 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3129 				     struct iscsi_uevent *ev, uint32_t len)
3130 {
3131 	char *data = (char *)ev + sizeof(*ev);
3132 	struct Scsi_Host *shost;
3133 	struct iscsi_bus_flash_session *fnode_sess;
3134 	struct iscsi_bus_flash_conn *fnode_conn;
3135 	struct device *dev;
3136 	uint32_t idx;
3137 	int err = 0;
3138 
3139 	if (!transport->set_flashnode_param) {
3140 		err = -ENOSYS;
3141 		goto exit_set_fnode;
3142 	}
3143 
3144 	shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3145 	if (!shost) {
3146 		pr_err("%s could not find host no %u\n",
3147 		       __func__, ev->u.set_flashnode.host_no);
3148 		err = -ENODEV;
3149 		goto put_host;
3150 	}
3151 
3152 	idx = ev->u.set_flashnode.flashnode_idx;
3153 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3154 	if (!fnode_sess) {
3155 		pr_err("%s could not find flashnode %u for host no %u\n",
3156 		       __func__, idx, ev->u.set_flashnode.host_no);
3157 		err = -ENODEV;
3158 		goto put_host;
3159 	}
3160 
3161 	dev = iscsi_find_flashnode_conn(fnode_sess);
3162 	if (!dev) {
3163 		err = -ENODEV;
3164 		goto put_sess;
3165 	}
3166 
3167 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3168 	err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3169 	put_device(dev);
3170 
3171 put_sess:
3172 	put_device(&fnode_sess->dev);
3173 
3174 put_host:
3175 	scsi_host_put(shost);
3176 
3177 exit_set_fnode:
3178 	return err;
3179 }
3180 
3181 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3182 			       struct iscsi_uevent *ev, uint32_t len)
3183 {
3184 	char *data = (char *)ev + sizeof(*ev);
3185 	struct Scsi_Host *shost;
3186 	int index;
3187 	int err = 0;
3188 
3189 	if (!transport->new_flashnode) {
3190 		err = -ENOSYS;
3191 		goto exit_new_fnode;
3192 	}
3193 
3194 	shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3195 	if (!shost) {
3196 		pr_err("%s could not find host no %u\n",
3197 		       __func__, ev->u.new_flashnode.host_no);
3198 		err = -ENODEV;
3199 		goto put_host;
3200 	}
3201 
3202 	index = transport->new_flashnode(shost, data, len);
3203 
3204 	if (index >= 0)
3205 		ev->r.new_flashnode_ret.flashnode_idx = index;
3206 	else
3207 		err = -EIO;
3208 
3209 put_host:
3210 	scsi_host_put(shost);
3211 
3212 exit_new_fnode:
3213 	return err;
3214 }
3215 
3216 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3217 			       struct iscsi_uevent *ev)
3218 {
3219 	struct Scsi_Host *shost;
3220 	struct iscsi_bus_flash_session *fnode_sess;
3221 	uint32_t idx;
3222 	int err = 0;
3223 
3224 	if (!transport->del_flashnode) {
3225 		err = -ENOSYS;
3226 		goto exit_del_fnode;
3227 	}
3228 
3229 	shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3230 	if (!shost) {
3231 		pr_err("%s could not find host no %u\n",
3232 		       __func__, ev->u.del_flashnode.host_no);
3233 		err = -ENODEV;
3234 		goto put_host;
3235 	}
3236 
3237 	idx = ev->u.del_flashnode.flashnode_idx;
3238 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3239 	if (!fnode_sess) {
3240 		pr_err("%s could not find flashnode %u for host no %u\n",
3241 		       __func__, idx, ev->u.del_flashnode.host_no);
3242 		err = -ENODEV;
3243 		goto put_host;
3244 	}
3245 
3246 	err = transport->del_flashnode(fnode_sess);
3247 	put_device(&fnode_sess->dev);
3248 
3249 put_host:
3250 	scsi_host_put(shost);
3251 
3252 exit_del_fnode:
3253 	return err;
3254 }
3255 
3256 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3257 				 struct iscsi_uevent *ev)
3258 {
3259 	struct Scsi_Host *shost;
3260 	struct iscsi_bus_flash_session *fnode_sess;
3261 	struct iscsi_bus_flash_conn *fnode_conn;
3262 	struct device *dev;
3263 	uint32_t idx;
3264 	int err = 0;
3265 
3266 	if (!transport->login_flashnode) {
3267 		err = -ENOSYS;
3268 		goto exit_login_fnode;
3269 	}
3270 
3271 	shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3272 	if (!shost) {
3273 		pr_err("%s could not find host no %u\n",
3274 		       __func__, ev->u.login_flashnode.host_no);
3275 		err = -ENODEV;
3276 		goto put_host;
3277 	}
3278 
3279 	idx = ev->u.login_flashnode.flashnode_idx;
3280 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3281 	if (!fnode_sess) {
3282 		pr_err("%s could not find flashnode %u for host no %u\n",
3283 		       __func__, idx, ev->u.login_flashnode.host_no);
3284 		err = -ENODEV;
3285 		goto put_host;
3286 	}
3287 
3288 	dev = iscsi_find_flashnode_conn(fnode_sess);
3289 	if (!dev) {
3290 		err = -ENODEV;
3291 		goto put_sess;
3292 	}
3293 
3294 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3295 	err = transport->login_flashnode(fnode_sess, fnode_conn);
3296 	put_device(dev);
3297 
3298 put_sess:
3299 	put_device(&fnode_sess->dev);
3300 
3301 put_host:
3302 	scsi_host_put(shost);
3303 
3304 exit_login_fnode:
3305 	return err;
3306 }
3307 
3308 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3309 				  struct iscsi_uevent *ev)
3310 {
3311 	struct Scsi_Host *shost;
3312 	struct iscsi_bus_flash_session *fnode_sess;
3313 	struct iscsi_bus_flash_conn *fnode_conn;
3314 	struct device *dev;
3315 	uint32_t idx;
3316 	int err = 0;
3317 
3318 	if (!transport->logout_flashnode) {
3319 		err = -ENOSYS;
3320 		goto exit_logout_fnode;
3321 	}
3322 
3323 	shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3324 	if (!shost) {
3325 		pr_err("%s could not find host no %u\n",
3326 		       __func__, ev->u.logout_flashnode.host_no);
3327 		err = -ENODEV;
3328 		goto put_host;
3329 	}
3330 
3331 	idx = ev->u.logout_flashnode.flashnode_idx;
3332 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3333 	if (!fnode_sess) {
3334 		pr_err("%s could not find flashnode %u for host no %u\n",
3335 		       __func__, idx, ev->u.logout_flashnode.host_no);
3336 		err = -ENODEV;
3337 		goto put_host;
3338 	}
3339 
3340 	dev = iscsi_find_flashnode_conn(fnode_sess);
3341 	if (!dev) {
3342 		err = -ENODEV;
3343 		goto put_sess;
3344 	}
3345 
3346 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3347 
3348 	err = transport->logout_flashnode(fnode_sess, fnode_conn);
3349 	put_device(dev);
3350 
3351 put_sess:
3352 	put_device(&fnode_sess->dev);
3353 
3354 put_host:
3355 	scsi_host_put(shost);
3356 
3357 exit_logout_fnode:
3358 	return err;
3359 }
3360 
3361 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3362 				      struct iscsi_uevent *ev)
3363 {
3364 	struct Scsi_Host *shost;
3365 	struct iscsi_cls_session *session;
3366 	int err = 0;
3367 
3368 	if (!transport->logout_flashnode_sid) {
3369 		err = -ENOSYS;
3370 		goto exit_logout_sid;
3371 	}
3372 
3373 	shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3374 	if (!shost) {
3375 		pr_err("%s could not find host no %u\n",
3376 		       __func__, ev->u.logout_flashnode.host_no);
3377 		err = -ENODEV;
3378 		goto put_host;
3379 	}
3380 
3381 	session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3382 	if (!session) {
3383 		pr_err("%s could not find session id %u\n",
3384 		       __func__, ev->u.logout_flashnode_sid.sid);
3385 		err = -EINVAL;
3386 		goto put_host;
3387 	}
3388 
3389 	err = transport->logout_flashnode_sid(session);
3390 
3391 put_host:
3392 	scsi_host_put(shost);
3393 
3394 exit_logout_sid:
3395 	return err;
3396 }
3397 
3398 static int
3399 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3400 {
3401 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3402 	struct Scsi_Host *shost = NULL;
3403 	struct iscsi_internal *priv;
3404 	struct sk_buff *skbhost_stats;
3405 	struct nlmsghdr *nlhhost_stats;
3406 	struct iscsi_uevent *evhost_stats;
3407 	int host_stats_size = 0;
3408 	int len, err = 0;
3409 	char *buf;
3410 
3411 	if (!transport->get_host_stats)
3412 		return -ENOSYS;
3413 
3414 	priv = iscsi_if_transport_lookup(transport);
3415 	if (!priv)
3416 		return -EINVAL;
3417 
3418 	host_stats_size = sizeof(struct iscsi_offload_host_stats);
3419 	len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3420 
3421 	shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3422 	if (!shost) {
3423 		pr_err("%s: failed. Could not find host no %u\n",
3424 		       __func__, ev->u.get_host_stats.host_no);
3425 		return -ENODEV;
3426 	}
3427 
3428 	do {
3429 		int actual_size;
3430 
3431 		skbhost_stats = alloc_skb(len, GFP_KERNEL);
3432 		if (!skbhost_stats) {
3433 			pr_err("cannot deliver host stats: OOM\n");
3434 			err = -ENOMEM;
3435 			goto exit_host_stats;
3436 		}
3437 
3438 		nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3439 				      (len - sizeof(*nlhhost_stats)), 0);
3440 		evhost_stats = nlmsg_data(nlhhost_stats);
3441 		memset(evhost_stats, 0, sizeof(*evhost_stats));
3442 		evhost_stats->transport_handle = iscsi_handle(transport);
3443 		evhost_stats->type = nlh->nlmsg_type;
3444 		evhost_stats->u.get_host_stats.host_no =
3445 					ev->u.get_host_stats.host_no;
3446 		buf = (char *)evhost_stats + sizeof(*evhost_stats);
3447 		memset(buf, 0, host_stats_size);
3448 
3449 		err = transport->get_host_stats(shost, buf, host_stats_size);
3450 		if (err) {
3451 			kfree_skb(skbhost_stats);
3452 			goto exit_host_stats;
3453 		}
3454 
3455 		actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3456 		skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3457 		nlhhost_stats->nlmsg_len = actual_size;
3458 
3459 		err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3460 					  GFP_KERNEL);
3461 	} while (err < 0 && err != -ECONNREFUSED);
3462 
3463 exit_host_stats:
3464 	scsi_host_put(shost);
3465 	return err;
3466 }
3467 
3468 
3469 static int
3470 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3471 {
3472 	int err = 0;
3473 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3474 	struct iscsi_transport *transport = NULL;
3475 	struct iscsi_internal *priv;
3476 	struct iscsi_cls_session *session;
3477 	struct iscsi_cls_conn *conn;
3478 	struct iscsi_endpoint *ep = NULL;
3479 
3480 	if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3481 		*group = ISCSI_NL_GRP_UIP;
3482 	else
3483 		*group = ISCSI_NL_GRP_ISCSID;
3484 
3485 	priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3486 	if (!priv)
3487 		return -EINVAL;
3488 	transport = priv->iscsi_transport;
3489 
3490 	if (!try_module_get(transport->owner))
3491 		return -EINVAL;
3492 
3493 	switch (nlh->nlmsg_type) {
3494 	case ISCSI_UEVENT_CREATE_SESSION:
3495 		err = iscsi_if_create_session(priv, ep, ev,
3496 					      NETLINK_CB(skb).portid,
3497 					      ev->u.c_session.initial_cmdsn,
3498 					      ev->u.c_session.cmds_max,
3499 					      ev->u.c_session.queue_depth);
3500 		break;
3501 	case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3502 		ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3503 		if (!ep) {
3504 			err = -EINVAL;
3505 			break;
3506 		}
3507 
3508 		err = iscsi_if_create_session(priv, ep, ev,
3509 					NETLINK_CB(skb).portid,
3510 					ev->u.c_bound_session.initial_cmdsn,
3511 					ev->u.c_bound_session.cmds_max,
3512 					ev->u.c_bound_session.queue_depth);
3513 		break;
3514 	case ISCSI_UEVENT_DESTROY_SESSION:
3515 		session = iscsi_session_lookup(ev->u.d_session.sid);
3516 		if (session)
3517 			transport->destroy_session(session);
3518 		else
3519 			err = -EINVAL;
3520 		break;
3521 	case ISCSI_UEVENT_UNBIND_SESSION:
3522 		session = iscsi_session_lookup(ev->u.d_session.sid);
3523 		if (session)
3524 			scsi_queue_work(iscsi_session_to_shost(session),
3525 					&session->unbind_work);
3526 		else
3527 			err = -EINVAL;
3528 		break;
3529 	case ISCSI_UEVENT_CREATE_CONN:
3530 		err = iscsi_if_create_conn(transport, ev);
3531 		break;
3532 	case ISCSI_UEVENT_DESTROY_CONN:
3533 		err = iscsi_if_destroy_conn(transport, ev);
3534 		break;
3535 	case ISCSI_UEVENT_BIND_CONN:
3536 		session = iscsi_session_lookup(ev->u.b_conn.sid);
3537 		conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3538 
3539 		if (conn && conn->ep)
3540 			iscsi_if_ep_disconnect(transport, conn->ep->id);
3541 
3542 		if (!session || !conn) {
3543 			err = -EINVAL;
3544 			break;
3545 		}
3546 
3547 		ev->r.retcode =	transport->bind_conn(session, conn,
3548 						ev->u.b_conn.transport_eph,
3549 						ev->u.b_conn.is_leading);
3550 		if (ev->r.retcode || !transport->ep_connect)
3551 			break;
3552 
3553 		ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3554 		if (ep) {
3555 			ep->conn = conn;
3556 
3557 			mutex_lock(&conn->ep_mutex);
3558 			conn->ep = ep;
3559 			mutex_unlock(&conn->ep_mutex);
3560 		} else
3561 			iscsi_cls_conn_printk(KERN_ERR, conn,
3562 					      "Could not set ep conn "
3563 					      "binding\n");
3564 		break;
3565 	case ISCSI_UEVENT_SET_PARAM:
3566 		err = iscsi_set_param(transport, ev);
3567 		break;
3568 	case ISCSI_UEVENT_START_CONN:
3569 		conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3570 		if (conn)
3571 			ev->r.retcode = transport->start_conn(conn);
3572 		else
3573 			err = -EINVAL;
3574 		break;
3575 	case ISCSI_UEVENT_STOP_CONN:
3576 		conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3577 		if (conn)
3578 			transport->stop_conn(conn, ev->u.stop_conn.flag);
3579 		else
3580 			err = -EINVAL;
3581 		break;
3582 	case ISCSI_UEVENT_SEND_PDU:
3583 		conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3584 		if (conn)
3585 			ev->r.retcode =	transport->send_pdu(conn,
3586 				(struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3587 				(char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3588 				ev->u.send_pdu.data_size);
3589 		else
3590 			err = -EINVAL;
3591 		break;
3592 	case ISCSI_UEVENT_GET_STATS:
3593 		err = iscsi_if_get_stats(transport, nlh);
3594 		break;
3595 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3596 	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3597 	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3598 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3599 		err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3600 		break;
3601 	case ISCSI_UEVENT_TGT_DSCVR:
3602 		err = iscsi_tgt_dscvr(transport, ev);
3603 		break;
3604 	case ISCSI_UEVENT_SET_HOST_PARAM:
3605 		err = iscsi_set_host_param(transport, ev);
3606 		break;
3607 	case ISCSI_UEVENT_PATH_UPDATE:
3608 		err = iscsi_set_path(transport, ev);
3609 		break;
3610 	case ISCSI_UEVENT_SET_IFACE_PARAMS:
3611 		err = iscsi_set_iface_params(transport, ev,
3612 					     nlmsg_attrlen(nlh, sizeof(*ev)));
3613 		break;
3614 	case ISCSI_UEVENT_PING:
3615 		err = iscsi_send_ping(transport, ev);
3616 		break;
3617 	case ISCSI_UEVENT_GET_CHAP:
3618 		err = iscsi_get_chap(transport, nlh);
3619 		break;
3620 	case ISCSI_UEVENT_DELETE_CHAP:
3621 		err = iscsi_delete_chap(transport, ev);
3622 		break;
3623 	case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3624 		err = iscsi_set_flashnode_param(transport, ev,
3625 						nlmsg_attrlen(nlh,
3626 							      sizeof(*ev)));
3627 		break;
3628 	case ISCSI_UEVENT_NEW_FLASHNODE:
3629 		err = iscsi_new_flashnode(transport, ev,
3630 					  nlmsg_attrlen(nlh, sizeof(*ev)));
3631 		break;
3632 	case ISCSI_UEVENT_DEL_FLASHNODE:
3633 		err = iscsi_del_flashnode(transport, ev);
3634 		break;
3635 	case ISCSI_UEVENT_LOGIN_FLASHNODE:
3636 		err = iscsi_login_flashnode(transport, ev);
3637 		break;
3638 	case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3639 		err = iscsi_logout_flashnode(transport, ev);
3640 		break;
3641 	case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3642 		err = iscsi_logout_flashnode_sid(transport, ev);
3643 		break;
3644 	case ISCSI_UEVENT_SET_CHAP:
3645 		err = iscsi_set_chap(transport, ev,
3646 				     nlmsg_attrlen(nlh, sizeof(*ev)));
3647 		break;
3648 	case ISCSI_UEVENT_GET_HOST_STATS:
3649 		err = iscsi_get_host_stats(transport, nlh);
3650 		break;
3651 	default:
3652 		err = -ENOSYS;
3653 		break;
3654 	}
3655 
3656 	module_put(transport->owner);
3657 	return err;
3658 }
3659 
3660 /*
3661  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3662  * Malformed skbs with wrong lengths or invalid creds are not processed.
3663  */
3664 static void
3665 iscsi_if_rx(struct sk_buff *skb)
3666 {
3667 	mutex_lock(&rx_queue_mutex);
3668 	while (skb->len >= NLMSG_HDRLEN) {
3669 		int err;
3670 		uint32_t rlen;
3671 		struct nlmsghdr	*nlh;
3672 		struct iscsi_uevent *ev;
3673 		uint32_t group;
3674 
3675 		nlh = nlmsg_hdr(skb);
3676 		if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3677 		    skb->len < nlh->nlmsg_len) {
3678 			break;
3679 		}
3680 
3681 		ev = nlmsg_data(nlh);
3682 		rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3683 		if (rlen > skb->len)
3684 			rlen = skb->len;
3685 
3686 		err = iscsi_if_recv_msg(skb, nlh, &group);
3687 		if (err) {
3688 			ev->type = ISCSI_KEVENT_IF_ERROR;
3689 			ev->iferror = err;
3690 		}
3691 		do {
3692 			/*
3693 			 * special case for GET_STATS:
3694 			 * on success - sending reply and stats from
3695 			 * inside of if_recv_msg(),
3696 			 * on error - fall through.
3697 			 */
3698 			if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3699 				break;
3700 			if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3701 				break;
3702 			err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
3703 				nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
3704 		} while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3705 		skb_pull(skb, rlen);
3706 	}
3707 	mutex_unlock(&rx_queue_mutex);
3708 }
3709 
3710 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)		\
3711 struct device_attribute dev_attr_##_prefix##_##_name =	\
3712 	__ATTR(_name,_mode,_show,_store)
3713 
3714 /*
3715  * iSCSI connection attrs
3716  */
3717 #define iscsi_conn_attr_show(param)					\
3718 static ssize_t								\
3719 show_conn_param_##param(struct device *dev, 				\
3720 			struct device_attribute *attr, char *buf)	\
3721 {									\
3722 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);	\
3723 	struct iscsi_transport *t = conn->transport;			\
3724 	return t->get_conn_param(conn, param, buf);			\
3725 }
3726 
3727 #define iscsi_conn_attr(field, param)					\
3728 	iscsi_conn_attr_show(param)					\
3729 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,	\
3730 			NULL);
3731 
3732 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3733 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3734 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3735 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3736 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3737 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3738 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3739 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3740 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3741 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3742 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3743 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3744 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3745 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3746 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3747 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3748 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3749 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3750 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3751 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3752 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3753 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3754 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3755 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3756 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3757 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3758 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3759 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3760 
3761 
3762 #define iscsi_conn_ep_attr_show(param)					\
3763 static ssize_t show_conn_ep_param_##param(struct device *dev,		\
3764 					  struct device_attribute *attr,\
3765 					  char *buf)			\
3766 {									\
3767 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);	\
3768 	struct iscsi_transport *t = conn->transport;			\
3769 	struct iscsi_endpoint *ep;					\
3770 	ssize_t rc;							\
3771 									\
3772 	/*								\
3773 	 * Need to make sure ep_disconnect does not free the LLD's	\
3774 	 * interconnect resources while we are trying to read them.	\
3775 	 */								\
3776 	mutex_lock(&conn->ep_mutex);					\
3777 	ep = conn->ep;							\
3778 	if (!ep && t->ep_connect) {					\
3779 		mutex_unlock(&conn->ep_mutex);				\
3780 		return -ENOTCONN;					\
3781 	}								\
3782 									\
3783 	if (ep)								\
3784 		rc = t->get_ep_param(ep, param, buf);			\
3785 	else								\
3786 		rc = t->get_conn_param(conn, param, buf);		\
3787 	mutex_unlock(&conn->ep_mutex);					\
3788 	return rc;							\
3789 }
3790 
3791 #define iscsi_conn_ep_attr(field, param)				\
3792 	iscsi_conn_ep_attr_show(param)					\
3793 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,				\
3794 			show_conn_ep_param_##param, NULL);
3795 
3796 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
3797 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
3798 
3799 static struct attribute *iscsi_conn_attrs[] = {
3800 	&dev_attr_conn_max_recv_dlength.attr,
3801 	&dev_attr_conn_max_xmit_dlength.attr,
3802 	&dev_attr_conn_header_digest.attr,
3803 	&dev_attr_conn_data_digest.attr,
3804 	&dev_attr_conn_ifmarker.attr,
3805 	&dev_attr_conn_ofmarker.attr,
3806 	&dev_attr_conn_address.attr,
3807 	&dev_attr_conn_port.attr,
3808 	&dev_attr_conn_exp_statsn.attr,
3809 	&dev_attr_conn_persistent_address.attr,
3810 	&dev_attr_conn_persistent_port.attr,
3811 	&dev_attr_conn_ping_tmo.attr,
3812 	&dev_attr_conn_recv_tmo.attr,
3813 	&dev_attr_conn_local_port.attr,
3814 	&dev_attr_conn_statsn.attr,
3815 	&dev_attr_conn_keepalive_tmo.attr,
3816 	&dev_attr_conn_max_segment_size.attr,
3817 	&dev_attr_conn_tcp_timestamp_stat.attr,
3818 	&dev_attr_conn_tcp_wsf_disable.attr,
3819 	&dev_attr_conn_tcp_nagle_disable.attr,
3820 	&dev_attr_conn_tcp_timer_scale.attr,
3821 	&dev_attr_conn_tcp_timestamp_enable.attr,
3822 	&dev_attr_conn_fragment_disable.attr,
3823 	&dev_attr_conn_ipv4_tos.attr,
3824 	&dev_attr_conn_ipv6_traffic_class.attr,
3825 	&dev_attr_conn_ipv6_flow_label.attr,
3826 	&dev_attr_conn_is_fw_assigned_ipv6.attr,
3827 	&dev_attr_conn_tcp_xmit_wsf.attr,
3828 	&dev_attr_conn_tcp_recv_wsf.attr,
3829 	&dev_attr_conn_local_ipaddr.attr,
3830 	NULL,
3831 };
3832 
3833 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
3834 					 struct attribute *attr, int i)
3835 {
3836 	struct device *cdev = container_of(kobj, struct device, kobj);
3837 	struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
3838 	struct iscsi_transport *t = conn->transport;
3839 	int param;
3840 
3841 	if (attr == &dev_attr_conn_max_recv_dlength.attr)
3842 		param = ISCSI_PARAM_MAX_RECV_DLENGTH;
3843 	else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
3844 		param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
3845 	else if (attr == &dev_attr_conn_header_digest.attr)
3846 		param = ISCSI_PARAM_HDRDGST_EN;
3847 	else if (attr == &dev_attr_conn_data_digest.attr)
3848 		param = ISCSI_PARAM_DATADGST_EN;
3849 	else if (attr == &dev_attr_conn_ifmarker.attr)
3850 		param = ISCSI_PARAM_IFMARKER_EN;
3851 	else if (attr == &dev_attr_conn_ofmarker.attr)
3852 		param = ISCSI_PARAM_OFMARKER_EN;
3853 	else if (attr == &dev_attr_conn_address.attr)
3854 		param = ISCSI_PARAM_CONN_ADDRESS;
3855 	else if (attr == &dev_attr_conn_port.attr)
3856 		param = ISCSI_PARAM_CONN_PORT;
3857 	else if (attr == &dev_attr_conn_exp_statsn.attr)
3858 		param = ISCSI_PARAM_EXP_STATSN;
3859 	else if (attr == &dev_attr_conn_persistent_address.attr)
3860 		param = ISCSI_PARAM_PERSISTENT_ADDRESS;
3861 	else if (attr == &dev_attr_conn_persistent_port.attr)
3862 		param = ISCSI_PARAM_PERSISTENT_PORT;
3863 	else if (attr == &dev_attr_conn_ping_tmo.attr)
3864 		param = ISCSI_PARAM_PING_TMO;
3865 	else if (attr == &dev_attr_conn_recv_tmo.attr)
3866 		param = ISCSI_PARAM_RECV_TMO;
3867 	else if (attr == &dev_attr_conn_local_port.attr)
3868 		param = ISCSI_PARAM_LOCAL_PORT;
3869 	else if (attr == &dev_attr_conn_statsn.attr)
3870 		param = ISCSI_PARAM_STATSN;
3871 	else if (attr == &dev_attr_conn_keepalive_tmo.attr)
3872 		param = ISCSI_PARAM_KEEPALIVE_TMO;
3873 	else if (attr == &dev_attr_conn_max_segment_size.attr)
3874 		param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
3875 	else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
3876 		param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
3877 	else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
3878 		param = ISCSI_PARAM_TCP_WSF_DISABLE;
3879 	else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
3880 		param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
3881 	else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
3882 		param = ISCSI_PARAM_TCP_TIMER_SCALE;
3883 	else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
3884 		param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
3885 	else if (attr == &dev_attr_conn_fragment_disable.attr)
3886 		param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
3887 	else if (attr == &dev_attr_conn_ipv4_tos.attr)
3888 		param = ISCSI_PARAM_IPV4_TOS;
3889 	else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
3890 		param = ISCSI_PARAM_IPV6_TC;
3891 	else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
3892 		param = ISCSI_PARAM_IPV6_FLOW_LABEL;
3893 	else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
3894 		param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
3895 	else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
3896 		param = ISCSI_PARAM_TCP_XMIT_WSF;
3897 	else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
3898 		param = ISCSI_PARAM_TCP_RECV_WSF;
3899 	else if (attr == &dev_attr_conn_local_ipaddr.attr)
3900 		param = ISCSI_PARAM_LOCAL_IPADDR;
3901 	else {
3902 		WARN_ONCE(1, "Invalid conn attr");
3903 		return 0;
3904 	}
3905 
3906 	return t->attr_is_visible(ISCSI_PARAM, param);
3907 }
3908 
3909 static struct attribute_group iscsi_conn_group = {
3910 	.attrs = iscsi_conn_attrs,
3911 	.is_visible = iscsi_conn_attr_is_visible,
3912 };
3913 
3914 /*
3915  * iSCSI session attrs
3916  */
3917 #define iscsi_session_attr_show(param, perm)				\
3918 static ssize_t								\
3919 show_session_param_##param(struct device *dev,				\
3920 			   struct device_attribute *attr, char *buf)	\
3921 {									\
3922 	struct iscsi_cls_session *session = 				\
3923 		iscsi_dev_to_session(dev->parent);			\
3924 	struct iscsi_transport *t = session->transport;			\
3925 									\
3926 	if (perm && !capable(CAP_SYS_ADMIN))				\
3927 		return -EACCES;						\
3928 	return t->get_session_param(session, param, buf);		\
3929 }
3930 
3931 #define iscsi_session_attr(field, param, perm)				\
3932 	iscsi_session_attr_show(param, perm)				\
3933 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
3934 			NULL);
3935 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
3936 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
3937 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
3938 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
3939 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
3940 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
3941 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
3942 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
3943 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
3944 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
3945 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
3946 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
3947 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
3948 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
3949 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
3950 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
3951 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
3952 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
3953 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3954 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
3955 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3956 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
3957 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
3958 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
3959 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
3960 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
3961 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
3962 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
3963 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
3964 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
3965 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
3966 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
3967 iscsi_session_attr(discovery_auth_optional,
3968 		   ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
3969 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
3970 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
3971 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
3972 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
3973 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
3974 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
3975 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
3976 
3977 static ssize_t
3978 show_priv_session_state(struct device *dev, struct device_attribute *attr,
3979 			char *buf)
3980 {
3981 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
3982 	return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
3983 }
3984 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
3985 			NULL);
3986 static ssize_t
3987 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
3988 			char *buf)
3989 {
3990 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
3991 	return sprintf(buf, "%d\n", session->creator);
3992 }
3993 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
3994 			NULL);
3995 static ssize_t
3996 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
3997 			    char *buf)
3998 {
3999 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4000 	return sprintf(buf, "%d\n", session->target_id);
4001 }
4002 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4003 			show_priv_session_target_id, NULL);
4004 
4005 #define iscsi_priv_session_attr_show(field, format)			\
4006 static ssize_t								\
4007 show_priv_session_##field(struct device *dev, 				\
4008 			  struct device_attribute *attr, char *buf)	\
4009 {									\
4010 	struct iscsi_cls_session *session = 				\
4011 			iscsi_dev_to_session(dev->parent);		\
4012 	if (session->field == -1)					\
4013 		return sprintf(buf, "off\n");				\
4014 	return sprintf(buf, format"\n", session->field);		\
4015 }
4016 
4017 #define iscsi_priv_session_attr_store(field)				\
4018 static ssize_t								\
4019 store_priv_session_##field(struct device *dev,				\
4020 			   struct device_attribute *attr,		\
4021 			   const char *buf, size_t count)		\
4022 {									\
4023 	int val;							\
4024 	char *cp;							\
4025 	struct iscsi_cls_session *session =				\
4026 		iscsi_dev_to_session(dev->parent);			\
4027 	if ((session->state == ISCSI_SESSION_FREE) ||			\
4028 	    (session->state == ISCSI_SESSION_FAILED))			\
4029 		return -EBUSY;						\
4030 	if (strncmp(buf, "off", 3) == 0) {				\
4031 		session->field = -1;					\
4032 		session->field##_sysfs_override = true;			\
4033 	} else {							\
4034 		val = simple_strtoul(buf, &cp, 0);			\
4035 		if (*cp != '\0' && *cp != '\n')				\
4036 			return -EINVAL;					\
4037 		session->field = val;					\
4038 		session->field##_sysfs_override = true;			\
4039 	}								\
4040 	return count;							\
4041 }
4042 
4043 #define iscsi_priv_session_rw_attr(field, format)			\
4044 	iscsi_priv_session_attr_show(field, format)			\
4045 	iscsi_priv_session_attr_store(field)				\
4046 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,		\
4047 			show_priv_session_##field,			\
4048 			store_priv_session_##field)
4049 
4050 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4051 
4052 static struct attribute *iscsi_session_attrs[] = {
4053 	&dev_attr_sess_initial_r2t.attr,
4054 	&dev_attr_sess_max_outstanding_r2t.attr,
4055 	&dev_attr_sess_immediate_data.attr,
4056 	&dev_attr_sess_first_burst_len.attr,
4057 	&dev_attr_sess_max_burst_len.attr,
4058 	&dev_attr_sess_data_pdu_in_order.attr,
4059 	&dev_attr_sess_data_seq_in_order.attr,
4060 	&dev_attr_sess_erl.attr,
4061 	&dev_attr_sess_targetname.attr,
4062 	&dev_attr_sess_tpgt.attr,
4063 	&dev_attr_sess_password.attr,
4064 	&dev_attr_sess_password_in.attr,
4065 	&dev_attr_sess_username.attr,
4066 	&dev_attr_sess_username_in.attr,
4067 	&dev_attr_sess_fast_abort.attr,
4068 	&dev_attr_sess_abort_tmo.attr,
4069 	&dev_attr_sess_lu_reset_tmo.attr,
4070 	&dev_attr_sess_tgt_reset_tmo.attr,
4071 	&dev_attr_sess_ifacename.attr,
4072 	&dev_attr_sess_initiatorname.attr,
4073 	&dev_attr_sess_targetalias.attr,
4074 	&dev_attr_sess_boot_root.attr,
4075 	&dev_attr_sess_boot_nic.attr,
4076 	&dev_attr_sess_boot_target.attr,
4077 	&dev_attr_priv_sess_recovery_tmo.attr,
4078 	&dev_attr_priv_sess_state.attr,
4079 	&dev_attr_priv_sess_creator.attr,
4080 	&dev_attr_sess_chap_out_idx.attr,
4081 	&dev_attr_sess_chap_in_idx.attr,
4082 	&dev_attr_priv_sess_target_id.attr,
4083 	&dev_attr_sess_auto_snd_tgt_disable.attr,
4084 	&dev_attr_sess_discovery_session.attr,
4085 	&dev_attr_sess_portal_type.attr,
4086 	&dev_attr_sess_chap_auth.attr,
4087 	&dev_attr_sess_discovery_logout.attr,
4088 	&dev_attr_sess_bidi_chap.attr,
4089 	&dev_attr_sess_discovery_auth_optional.attr,
4090 	&dev_attr_sess_def_time2wait.attr,
4091 	&dev_attr_sess_def_time2retain.attr,
4092 	&dev_attr_sess_isid.attr,
4093 	&dev_attr_sess_tsid.attr,
4094 	&dev_attr_sess_def_taskmgmt_tmo.attr,
4095 	&dev_attr_sess_discovery_parent_idx.attr,
4096 	&dev_attr_sess_discovery_parent_type.attr,
4097 	NULL,
4098 };
4099 
4100 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4101 					    struct attribute *attr, int i)
4102 {
4103 	struct device *cdev = container_of(kobj, struct device, kobj);
4104 	struct iscsi_cls_session *session = transport_class_to_session(cdev);
4105 	struct iscsi_transport *t = session->transport;
4106 	int param;
4107 
4108 	if (attr == &dev_attr_sess_initial_r2t.attr)
4109 		param = ISCSI_PARAM_INITIAL_R2T_EN;
4110 	else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4111 		param = ISCSI_PARAM_MAX_R2T;
4112 	else if (attr == &dev_attr_sess_immediate_data.attr)
4113 		param = ISCSI_PARAM_IMM_DATA_EN;
4114 	else if (attr == &dev_attr_sess_first_burst_len.attr)
4115 		param = ISCSI_PARAM_FIRST_BURST;
4116 	else if (attr == &dev_attr_sess_max_burst_len.attr)
4117 		param = ISCSI_PARAM_MAX_BURST;
4118 	else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4119 		param = ISCSI_PARAM_PDU_INORDER_EN;
4120 	else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4121 		param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4122 	else if (attr == &dev_attr_sess_erl.attr)
4123 		param = ISCSI_PARAM_ERL;
4124 	else if (attr == &dev_attr_sess_targetname.attr)
4125 		param = ISCSI_PARAM_TARGET_NAME;
4126 	else if (attr == &dev_attr_sess_tpgt.attr)
4127 		param = ISCSI_PARAM_TPGT;
4128 	else if (attr == &dev_attr_sess_chap_in_idx.attr)
4129 		param = ISCSI_PARAM_CHAP_IN_IDX;
4130 	else if (attr == &dev_attr_sess_chap_out_idx.attr)
4131 		param = ISCSI_PARAM_CHAP_OUT_IDX;
4132 	else if (attr == &dev_attr_sess_password.attr)
4133 		param = ISCSI_PARAM_USERNAME;
4134 	else if (attr == &dev_attr_sess_password_in.attr)
4135 		param = ISCSI_PARAM_USERNAME_IN;
4136 	else if (attr == &dev_attr_sess_username.attr)
4137 		param = ISCSI_PARAM_PASSWORD;
4138 	else if (attr == &dev_attr_sess_username_in.attr)
4139 		param = ISCSI_PARAM_PASSWORD_IN;
4140 	else if (attr == &dev_attr_sess_fast_abort.attr)
4141 		param = ISCSI_PARAM_FAST_ABORT;
4142 	else if (attr == &dev_attr_sess_abort_tmo.attr)
4143 		param = ISCSI_PARAM_ABORT_TMO;
4144 	else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4145 		param = ISCSI_PARAM_LU_RESET_TMO;
4146 	else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4147 		param = ISCSI_PARAM_TGT_RESET_TMO;
4148 	else if (attr == &dev_attr_sess_ifacename.attr)
4149 		param = ISCSI_PARAM_IFACE_NAME;
4150 	else if (attr == &dev_attr_sess_initiatorname.attr)
4151 		param = ISCSI_PARAM_INITIATOR_NAME;
4152 	else if (attr == &dev_attr_sess_targetalias.attr)
4153 		param = ISCSI_PARAM_TARGET_ALIAS;
4154 	else if (attr == &dev_attr_sess_boot_root.attr)
4155 		param = ISCSI_PARAM_BOOT_ROOT;
4156 	else if (attr == &dev_attr_sess_boot_nic.attr)
4157 		param = ISCSI_PARAM_BOOT_NIC;
4158 	else if (attr == &dev_attr_sess_boot_target.attr)
4159 		param = ISCSI_PARAM_BOOT_TARGET;
4160 	else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4161 		param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4162 	else if (attr == &dev_attr_sess_discovery_session.attr)
4163 		param = ISCSI_PARAM_DISCOVERY_SESS;
4164 	else if (attr == &dev_attr_sess_portal_type.attr)
4165 		param = ISCSI_PARAM_PORTAL_TYPE;
4166 	else if (attr == &dev_attr_sess_chap_auth.attr)
4167 		param = ISCSI_PARAM_CHAP_AUTH_EN;
4168 	else if (attr == &dev_attr_sess_discovery_logout.attr)
4169 		param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4170 	else if (attr == &dev_attr_sess_bidi_chap.attr)
4171 		param = ISCSI_PARAM_BIDI_CHAP_EN;
4172 	else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4173 		param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4174 	else if (attr == &dev_attr_sess_def_time2wait.attr)
4175 		param = ISCSI_PARAM_DEF_TIME2WAIT;
4176 	else if (attr == &dev_attr_sess_def_time2retain.attr)
4177 		param = ISCSI_PARAM_DEF_TIME2RETAIN;
4178 	else if (attr == &dev_attr_sess_isid.attr)
4179 		param = ISCSI_PARAM_ISID;
4180 	else if (attr == &dev_attr_sess_tsid.attr)
4181 		param = ISCSI_PARAM_TSID;
4182 	else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4183 		param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4184 	else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4185 		param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4186 	else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4187 		param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4188 	else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4189 		return S_IRUGO | S_IWUSR;
4190 	else if (attr == &dev_attr_priv_sess_state.attr)
4191 		return S_IRUGO;
4192 	else if (attr == &dev_attr_priv_sess_creator.attr)
4193 		return S_IRUGO;
4194 	else if (attr == &dev_attr_priv_sess_target_id.attr)
4195 		return S_IRUGO;
4196 	else {
4197 		WARN_ONCE(1, "Invalid session attr");
4198 		return 0;
4199 	}
4200 
4201 	return t->attr_is_visible(ISCSI_PARAM, param);
4202 }
4203 
4204 static struct attribute_group iscsi_session_group = {
4205 	.attrs = iscsi_session_attrs,
4206 	.is_visible = iscsi_session_attr_is_visible,
4207 };
4208 
4209 /*
4210  * iSCSI host attrs
4211  */
4212 #define iscsi_host_attr_show(param)					\
4213 static ssize_t								\
4214 show_host_param_##param(struct device *dev, 				\
4215 			struct device_attribute *attr, char *buf)	\
4216 {									\
4217 	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
4218 	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4219 	return priv->iscsi_transport->get_host_param(shost, param, buf); \
4220 }
4221 
4222 #define iscsi_host_attr(field, param)					\
4223 	iscsi_host_attr_show(param)					\
4224 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,	\
4225 			NULL);
4226 
4227 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4228 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4229 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4230 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4231 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4232 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4233 
4234 static struct attribute *iscsi_host_attrs[] = {
4235 	&dev_attr_host_netdev.attr,
4236 	&dev_attr_host_hwaddress.attr,
4237 	&dev_attr_host_ipaddress.attr,
4238 	&dev_attr_host_initiatorname.attr,
4239 	&dev_attr_host_port_state.attr,
4240 	&dev_attr_host_port_speed.attr,
4241 	NULL,
4242 };
4243 
4244 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4245 					 struct attribute *attr, int i)
4246 {
4247 	struct device *cdev = container_of(kobj, struct device, kobj);
4248 	struct Scsi_Host *shost = transport_class_to_shost(cdev);
4249 	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4250 	int param;
4251 
4252 	if (attr == &dev_attr_host_netdev.attr)
4253 		param = ISCSI_HOST_PARAM_NETDEV_NAME;
4254 	else if (attr == &dev_attr_host_hwaddress.attr)
4255 		param = ISCSI_HOST_PARAM_HWADDRESS;
4256 	else if (attr == &dev_attr_host_ipaddress.attr)
4257 		param = ISCSI_HOST_PARAM_IPADDRESS;
4258 	else if (attr == &dev_attr_host_initiatorname.attr)
4259 		param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4260 	else if (attr == &dev_attr_host_port_state.attr)
4261 		param = ISCSI_HOST_PARAM_PORT_STATE;
4262 	else if (attr == &dev_attr_host_port_speed.attr)
4263 		param = ISCSI_HOST_PARAM_PORT_SPEED;
4264 	else {
4265 		WARN_ONCE(1, "Invalid host attr");
4266 		return 0;
4267 	}
4268 
4269 	return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4270 }
4271 
4272 static struct attribute_group iscsi_host_group = {
4273 	.attrs = iscsi_host_attrs,
4274 	.is_visible = iscsi_host_attr_is_visible,
4275 };
4276 
4277 /* convert iscsi_port_speed values to ascii string name */
4278 static const struct {
4279 	enum iscsi_port_speed	value;
4280 	char			*name;
4281 } iscsi_port_speed_names[] = {
4282 	{ISCSI_PORT_SPEED_UNKNOWN,	"Unknown" },
4283 	{ISCSI_PORT_SPEED_10MBPS,	"10 Mbps" },
4284 	{ISCSI_PORT_SPEED_100MBPS,	"100 Mbps" },
4285 	{ISCSI_PORT_SPEED_1GBPS,	"1 Gbps" },
4286 	{ISCSI_PORT_SPEED_10GBPS,	"10 Gbps" },
4287 	{ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4288 	{ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4289 };
4290 
4291 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4292 {
4293 	int i;
4294 	char *speed = "Unknown!";
4295 	struct iscsi_cls_host *ihost = shost->shost_data;
4296 	uint32_t port_speed = ihost->port_speed;
4297 
4298 	for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4299 		if (iscsi_port_speed_names[i].value & port_speed) {
4300 			speed = iscsi_port_speed_names[i].name;
4301 			break;
4302 		}
4303 	}
4304 	return speed;
4305 }
4306 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4307 
4308 /* convert iscsi_port_state values to ascii string name */
4309 static const struct {
4310 	enum iscsi_port_state	value;
4311 	char			*name;
4312 } iscsi_port_state_names[] = {
4313 	{ISCSI_PORT_STATE_DOWN,		"LINK DOWN" },
4314 	{ISCSI_PORT_STATE_UP,		"LINK UP" },
4315 };
4316 
4317 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4318 {
4319 	int i;
4320 	char *state = "Unknown!";
4321 	struct iscsi_cls_host *ihost = shost->shost_data;
4322 	uint32_t port_state = ihost->port_state;
4323 
4324 	for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4325 		if (iscsi_port_state_names[i].value & port_state) {
4326 			state = iscsi_port_state_names[i].name;
4327 			break;
4328 		}
4329 	}
4330 	return state;
4331 }
4332 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4333 
4334 static int iscsi_session_match(struct attribute_container *cont,
4335 			   struct device *dev)
4336 {
4337 	struct iscsi_cls_session *session;
4338 	struct Scsi_Host *shost;
4339 	struct iscsi_internal *priv;
4340 
4341 	if (!iscsi_is_session_dev(dev))
4342 		return 0;
4343 
4344 	session = iscsi_dev_to_session(dev);
4345 	shost = iscsi_session_to_shost(session);
4346 	if (!shost->transportt)
4347 		return 0;
4348 
4349 	priv = to_iscsi_internal(shost->transportt);
4350 	if (priv->session_cont.ac.class != &iscsi_session_class.class)
4351 		return 0;
4352 
4353 	return &priv->session_cont.ac == cont;
4354 }
4355 
4356 static int iscsi_conn_match(struct attribute_container *cont,
4357 			   struct device *dev)
4358 {
4359 	struct iscsi_cls_session *session;
4360 	struct iscsi_cls_conn *conn;
4361 	struct Scsi_Host *shost;
4362 	struct iscsi_internal *priv;
4363 
4364 	if (!iscsi_is_conn_dev(dev))
4365 		return 0;
4366 
4367 	conn = iscsi_dev_to_conn(dev);
4368 	session = iscsi_dev_to_session(conn->dev.parent);
4369 	shost = iscsi_session_to_shost(session);
4370 
4371 	if (!shost->transportt)
4372 		return 0;
4373 
4374 	priv = to_iscsi_internal(shost->transportt);
4375 	if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4376 		return 0;
4377 
4378 	return &priv->conn_cont.ac == cont;
4379 }
4380 
4381 static int iscsi_host_match(struct attribute_container *cont,
4382 			    struct device *dev)
4383 {
4384 	struct Scsi_Host *shost;
4385 	struct iscsi_internal *priv;
4386 
4387 	if (!scsi_is_host_device(dev))
4388 		return 0;
4389 
4390 	shost = dev_to_shost(dev);
4391 	if (!shost->transportt  ||
4392 	    shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4393 		return 0;
4394 
4395         priv = to_iscsi_internal(shost->transportt);
4396         return &priv->t.host_attrs.ac == cont;
4397 }
4398 
4399 struct scsi_transport_template *
4400 iscsi_register_transport(struct iscsi_transport *tt)
4401 {
4402 	struct iscsi_internal *priv;
4403 	unsigned long flags;
4404 	int err;
4405 
4406 	BUG_ON(!tt);
4407 
4408 	priv = iscsi_if_transport_lookup(tt);
4409 	if (priv)
4410 		return NULL;
4411 
4412 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4413 	if (!priv)
4414 		return NULL;
4415 	INIT_LIST_HEAD(&priv->list);
4416 	priv->iscsi_transport = tt;
4417 	priv->t.user_scan = iscsi_user_scan;
4418 	priv->t.create_work_queue = 1;
4419 
4420 	priv->dev.class = &iscsi_transport_class;
4421 	dev_set_name(&priv->dev, "%s", tt->name);
4422 	err = device_register(&priv->dev);
4423 	if (err)
4424 		goto free_priv;
4425 
4426 	err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4427 	if (err)
4428 		goto unregister_dev;
4429 
4430 	/* host parameters */
4431 	priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4432 	priv->t.host_attrs.ac.match = iscsi_host_match;
4433 	priv->t.host_attrs.ac.grp = &iscsi_host_group;
4434 	priv->t.host_size = sizeof(struct iscsi_cls_host);
4435 	transport_container_register(&priv->t.host_attrs);
4436 
4437 	/* connection parameters */
4438 	priv->conn_cont.ac.class = &iscsi_connection_class.class;
4439 	priv->conn_cont.ac.match = iscsi_conn_match;
4440 	priv->conn_cont.ac.grp = &iscsi_conn_group;
4441 	transport_container_register(&priv->conn_cont);
4442 
4443 	/* session parameters */
4444 	priv->session_cont.ac.class = &iscsi_session_class.class;
4445 	priv->session_cont.ac.match = iscsi_session_match;
4446 	priv->session_cont.ac.grp = &iscsi_session_group;
4447 	transport_container_register(&priv->session_cont);
4448 
4449 	spin_lock_irqsave(&iscsi_transport_lock, flags);
4450 	list_add(&priv->list, &iscsi_transports);
4451 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4452 
4453 	printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4454 	return &priv->t;
4455 
4456 unregister_dev:
4457 	device_unregister(&priv->dev);
4458 	return NULL;
4459 free_priv:
4460 	kfree(priv);
4461 	return NULL;
4462 }
4463 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4464 
4465 int iscsi_unregister_transport(struct iscsi_transport *tt)
4466 {
4467 	struct iscsi_internal *priv;
4468 	unsigned long flags;
4469 
4470 	BUG_ON(!tt);
4471 
4472 	mutex_lock(&rx_queue_mutex);
4473 
4474 	priv = iscsi_if_transport_lookup(tt);
4475 	BUG_ON (!priv);
4476 
4477 	spin_lock_irqsave(&iscsi_transport_lock, flags);
4478 	list_del(&priv->list);
4479 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4480 
4481 	transport_container_unregister(&priv->conn_cont);
4482 	transport_container_unregister(&priv->session_cont);
4483 	transport_container_unregister(&priv->t.host_attrs);
4484 
4485 	sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4486 	device_unregister(&priv->dev);
4487 	mutex_unlock(&rx_queue_mutex);
4488 
4489 	return 0;
4490 }
4491 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4492 
4493 static __init int iscsi_transport_init(void)
4494 {
4495 	int err;
4496 	struct netlink_kernel_cfg cfg = {
4497 		.groups	= 1,
4498 		.input	= iscsi_if_rx,
4499 	};
4500 	printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4501 		ISCSI_TRANSPORT_VERSION);
4502 
4503 	atomic_set(&iscsi_session_nr, 0);
4504 
4505 	err = class_register(&iscsi_transport_class);
4506 	if (err)
4507 		return err;
4508 
4509 	err = class_register(&iscsi_endpoint_class);
4510 	if (err)
4511 		goto unregister_transport_class;
4512 
4513 	err = class_register(&iscsi_iface_class);
4514 	if (err)
4515 		goto unregister_endpoint_class;
4516 
4517 	err = transport_class_register(&iscsi_host_class);
4518 	if (err)
4519 		goto unregister_iface_class;
4520 
4521 	err = transport_class_register(&iscsi_connection_class);
4522 	if (err)
4523 		goto unregister_host_class;
4524 
4525 	err = transport_class_register(&iscsi_session_class);
4526 	if (err)
4527 		goto unregister_conn_class;
4528 
4529 	err = bus_register(&iscsi_flashnode_bus);
4530 	if (err)
4531 		goto unregister_session_class;
4532 
4533 	nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4534 	if (!nls) {
4535 		err = -ENOBUFS;
4536 		goto unregister_flashnode_bus;
4537 	}
4538 
4539 	iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
4540 	if (!iscsi_eh_timer_workq) {
4541 		err = -ENOMEM;
4542 		goto release_nls;
4543 	}
4544 
4545 	return 0;
4546 
4547 release_nls:
4548 	netlink_kernel_release(nls);
4549 unregister_flashnode_bus:
4550 	bus_unregister(&iscsi_flashnode_bus);
4551 unregister_session_class:
4552 	transport_class_unregister(&iscsi_session_class);
4553 unregister_conn_class:
4554 	transport_class_unregister(&iscsi_connection_class);
4555 unregister_host_class:
4556 	transport_class_unregister(&iscsi_host_class);
4557 unregister_iface_class:
4558 	class_unregister(&iscsi_iface_class);
4559 unregister_endpoint_class:
4560 	class_unregister(&iscsi_endpoint_class);
4561 unregister_transport_class:
4562 	class_unregister(&iscsi_transport_class);
4563 	return err;
4564 }
4565 
4566 static void __exit iscsi_transport_exit(void)
4567 {
4568 	destroy_workqueue(iscsi_eh_timer_workq);
4569 	netlink_kernel_release(nls);
4570 	bus_unregister(&iscsi_flashnode_bus);
4571 	transport_class_unregister(&iscsi_connection_class);
4572 	transport_class_unregister(&iscsi_session_class);
4573 	transport_class_unregister(&iscsi_host_class);
4574 	class_unregister(&iscsi_endpoint_class);
4575 	class_unregister(&iscsi_iface_class);
4576 	class_unregister(&iscsi_transport_class);
4577 }
4578 
4579 module_init(iscsi_transport_init);
4580 module_exit(iscsi_transport_exit);
4581 
4582 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4583 	      "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4584 	      "Alex Aizman <itn780@yahoo.com>");
4585 MODULE_DESCRIPTION("iSCSI Transport Interface");
4586 MODULE_LICENSE("GPL");
4587 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4588 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
4589