1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * iSCSI transport class definitions
4  *
5  * Copyright (C) IBM Corporation, 2004
6  * Copyright (C) Mike Christie, 2004 - 2005
7  * Copyright (C) Dmitry Yusupov, 2004 - 2005
8  * Copyright (C) Alex Aizman, 2004 - 2005
9  */
10 #include <linux/module.h>
11 #include <linux/mutex.h>
12 #include <linux/slab.h>
13 #include <linux/bsg-lib.h>
14 #include <linux/idr.h>
15 #include <net/tcp.h>
16 #include <scsi/scsi.h>
17 #include <scsi/scsi_host.h>
18 #include <scsi/scsi_device.h>
19 #include <scsi/scsi_transport.h>
20 #include <scsi/scsi_transport_iscsi.h>
21 #include <scsi/iscsi_if.h>
22 #include <scsi/scsi_cmnd.h>
23 #include <scsi/scsi_bsg_iscsi.h>
24 
25 #define ISCSI_TRANSPORT_VERSION "2.0-870"
26 
27 #define ISCSI_SEND_MAX_ALLOWED  10
28 
29 #define CREATE_TRACE_POINTS
30 #include <trace/events/iscsi.h>
31 
32 /*
33  * Export tracepoint symbols to be used by other modules.
34  */
35 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
36 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
37 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
38 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
39 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
40 
41 static int dbg_session;
42 module_param_named(debug_session, dbg_session, int,
43 		   S_IRUGO | S_IWUSR);
44 MODULE_PARM_DESC(debug_session,
45 		 "Turn on debugging for sessions in scsi_transport_iscsi "
46 		 "module. Set to 1 to turn on, and zero to turn off. Default "
47 		 "is off.");
48 
49 static int dbg_conn;
50 module_param_named(debug_conn, dbg_conn, int,
51 		   S_IRUGO | S_IWUSR);
52 MODULE_PARM_DESC(debug_conn,
53 		 "Turn on debugging for connections in scsi_transport_iscsi "
54 		 "module. Set to 1 to turn on, and zero to turn off. Default "
55 		 "is off.");
56 
57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)		\
58 	do {								\
59 		if (dbg_session)					\
60 			iscsi_cls_session_printk(KERN_INFO, _session,	\
61 						 "%s: " dbg_fmt,	\
62 						 __func__, ##arg);	\
63 		iscsi_dbg_trace(trace_iscsi_dbg_trans_session,		\
64 				&(_session)->dev,			\
65 				"%s " dbg_fmt, __func__, ##arg);	\
66 	} while (0);
67 
68 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)			\
69 	do {								\
70 		if (dbg_conn)						\
71 			iscsi_cls_conn_printk(KERN_INFO, _conn,		\
72 					      "%s: " dbg_fmt,		\
73 					      __func__, ##arg);		\
74 		iscsi_dbg_trace(trace_iscsi_dbg_trans_conn,		\
75 				&(_conn)->dev,				\
76 				"%s " dbg_fmt, __func__, ##arg);	\
77 	} while (0);
78 
79 struct iscsi_internal {
80 	struct scsi_transport_template t;
81 	struct iscsi_transport *iscsi_transport;
82 	struct list_head list;
83 	struct device dev;
84 
85 	struct transport_container conn_cont;
86 	struct transport_container session_cont;
87 };
88 
89 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
90 static struct workqueue_struct *iscsi_eh_timer_workq;
91 
92 static DEFINE_IDA(iscsi_sess_ida);
93 /*
94  * list of registered transports and lock that must
95  * be held while accessing list. The iscsi_transport_lock must
96  * be acquired after the rx_queue_mutex.
97  */
98 static LIST_HEAD(iscsi_transports);
99 static DEFINE_SPINLOCK(iscsi_transport_lock);
100 
101 #define to_iscsi_internal(tmpl) \
102 	container_of(tmpl, struct iscsi_internal, t)
103 
104 #define dev_to_iscsi_internal(_dev) \
105 	container_of(_dev, struct iscsi_internal, dev)
106 
107 static void iscsi_transport_release(struct device *dev)
108 {
109 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
110 	kfree(priv);
111 }
112 
113 /*
114  * iscsi_transport_class represents the iscsi_transports that are
115  * registered.
116  */
117 static struct class iscsi_transport_class = {
118 	.name = "iscsi_transport",
119 	.dev_release = iscsi_transport_release,
120 };
121 
122 static ssize_t
123 show_transport_handle(struct device *dev, struct device_attribute *attr,
124 		      char *buf)
125 {
126 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
127 	return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
128 }
129 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
130 
131 #define show_transport_attr(name, format)				\
132 static ssize_t								\
133 show_transport_##name(struct device *dev, 				\
134 		      struct device_attribute *attr,char *buf)		\
135 {									\
136 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);	\
137 	return sprintf(buf, format"\n", priv->iscsi_transport->name);	\
138 }									\
139 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
140 
141 show_transport_attr(caps, "0x%x");
142 
143 static struct attribute *iscsi_transport_attrs[] = {
144 	&dev_attr_handle.attr,
145 	&dev_attr_caps.attr,
146 	NULL,
147 };
148 
149 static struct attribute_group iscsi_transport_group = {
150 	.attrs = iscsi_transport_attrs,
151 };
152 
153 /*
154  * iSCSI endpoint attrs
155  */
156 #define iscsi_dev_to_endpoint(_dev) \
157 	container_of(_dev, struct iscsi_endpoint, dev)
158 
159 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)	\
160 struct device_attribute dev_attr_##_prefix##_##_name =	\
161         __ATTR(_name,_mode,_show,_store)
162 
163 static void iscsi_endpoint_release(struct device *dev)
164 {
165 	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
166 	kfree(ep);
167 }
168 
169 static struct class iscsi_endpoint_class = {
170 	.name = "iscsi_endpoint",
171 	.dev_release = iscsi_endpoint_release,
172 };
173 
174 static ssize_t
175 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
176 {
177 	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
178 	return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
179 }
180 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
181 
182 static struct attribute *iscsi_endpoint_attrs[] = {
183 	&dev_attr_ep_handle.attr,
184 	NULL,
185 };
186 
187 static struct attribute_group iscsi_endpoint_group = {
188 	.attrs = iscsi_endpoint_attrs,
189 };
190 
191 #define ISCSI_MAX_EPID -1
192 
193 static int iscsi_match_epid(struct device *dev, const void *data)
194 {
195 	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
196 	const uint64_t *epid = data;
197 
198 	return *epid == ep->id;
199 }
200 
201 struct iscsi_endpoint *
202 iscsi_create_endpoint(int dd_size)
203 {
204 	struct device *dev;
205 	struct iscsi_endpoint *ep;
206 	uint64_t id;
207 	int err;
208 
209 	for (id = 1; id < ISCSI_MAX_EPID; id++) {
210 		dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
211 					iscsi_match_epid);
212 		if (!dev)
213 			break;
214 		else
215 			put_device(dev);
216 	}
217 	if (id == ISCSI_MAX_EPID) {
218 		printk(KERN_ERR "Too many connections. Max supported %u\n",
219 		       ISCSI_MAX_EPID - 1);
220 		return NULL;
221 	}
222 
223 	ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
224 	if (!ep)
225 		return NULL;
226 
227 	ep->id = id;
228 	ep->dev.class = &iscsi_endpoint_class;
229 	dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
230 	err = device_register(&ep->dev);
231         if (err)
232                 goto free_ep;
233 
234 	err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
235 	if (err)
236 		goto unregister_dev;
237 
238 	if (dd_size)
239 		ep->dd_data = &ep[1];
240 	return ep;
241 
242 unregister_dev:
243 	device_unregister(&ep->dev);
244 	return NULL;
245 
246 free_ep:
247 	kfree(ep);
248 	return NULL;
249 }
250 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
251 
252 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
253 {
254 	sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
255 	device_unregister(&ep->dev);
256 }
257 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
258 
259 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
260 {
261 	struct iscsi_endpoint *ep;
262 	struct device *dev;
263 
264 	dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
265 				iscsi_match_epid);
266 	if (!dev)
267 		return NULL;
268 
269 	ep = iscsi_dev_to_endpoint(dev);
270 	/*
271 	 * we can drop this now because the interface will prevent
272 	 * removals and lookups from racing.
273 	 */
274 	put_device(dev);
275 	return ep;
276 }
277 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
278 
279 /*
280  * Interface to display network param to sysfs
281  */
282 
283 static void iscsi_iface_release(struct device *dev)
284 {
285 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
286 	struct device *parent = iface->dev.parent;
287 
288 	kfree(iface);
289 	put_device(parent);
290 }
291 
292 
293 static struct class iscsi_iface_class = {
294 	.name = "iscsi_iface",
295 	.dev_release = iscsi_iface_release,
296 };
297 
298 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)	\
299 struct device_attribute dev_attr_##_prefix##_##_name =		\
300 	__ATTR(_name, _mode, _show, _store)
301 
302 /* iface attrs show */
303 #define iscsi_iface_attr_show(type, name, param_type, param)		\
304 static ssize_t								\
305 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
306 		     char *buf)						\
307 {									\
308 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);		\
309 	struct iscsi_transport *t = iface->transport;			\
310 	return t->get_iface_param(iface, param_type, param, buf);	\
311 }									\
312 
313 #define iscsi_iface_net_attr(type, name, param)				\
314 	iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)	\
315 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
316 
317 #define iscsi_iface_attr(type, name, param)				\
318 	iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)	\
319 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
320 
321 /* generic read only ipv4 attribute */
322 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
323 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
324 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
325 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
326 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
327 		     ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
328 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
329 		     ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
330 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
331 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
332 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
333 		     ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
334 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
335 		     ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
336 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
337 		     ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
338 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
339 		     ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
340 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
341 		     ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
342 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
343 		     ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
344 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
345 		     ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
346 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
347 		     ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
348 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
349 		     ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
350 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
351 
352 /* generic read only ipv6 attribute */
353 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
354 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
355 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL);
356 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
357 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
358 		     ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
359 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
360 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
361 iscsi_iface_net_attr(ipv6_iface, link_local_state,
362 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
363 iscsi_iface_net_attr(ipv6_iface, router_state,
364 		     ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
365 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
366 		     ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
367 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
368 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
369 iscsi_iface_net_attr(ipv6_iface, traffic_class,
370 		     ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
371 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
372 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
373 		     ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
374 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
375 		     ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
376 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
377 		     ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
378 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
379 		     ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
380 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
381 		     ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
382 
383 /* common read only iface attribute */
384 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
385 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
386 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
387 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
388 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
389 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
390 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
391 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
392 iscsi_iface_net_attr(iface, tcp_nagle_disable,
393 		     ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
394 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
395 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
396 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
397 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
398 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
399 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
400 
401 /* common iscsi specific settings attributes */
402 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
403 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
404 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
405 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
406 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
407 iscsi_iface_attr(iface, data_seq_in_order,
408 		 ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
409 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
410 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
411 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
412 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
413 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
414 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
415 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
416 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
417 iscsi_iface_attr(iface, discovery_auth_optional,
418 		 ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
419 iscsi_iface_attr(iface, discovery_logout,
420 		 ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
421 iscsi_iface_attr(iface, strict_login_comp_en,
422 		 ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
423 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
424 
425 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
426 					  struct attribute *attr, int i)
427 {
428 	struct device *dev = container_of(kobj, struct device, kobj);
429 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
430 	struct iscsi_transport *t = iface->transport;
431 	int param;
432 	int param_type;
433 
434 	if (attr == &dev_attr_iface_enabled.attr)
435 		param = ISCSI_NET_PARAM_IFACE_ENABLE;
436 	else if (attr == &dev_attr_iface_vlan_id.attr)
437 		param = ISCSI_NET_PARAM_VLAN_ID;
438 	else if (attr == &dev_attr_iface_vlan_priority.attr)
439 		param = ISCSI_NET_PARAM_VLAN_PRIORITY;
440 	else if (attr == &dev_attr_iface_vlan_enabled.attr)
441 		param = ISCSI_NET_PARAM_VLAN_ENABLED;
442 	else if (attr == &dev_attr_iface_mtu.attr)
443 		param = ISCSI_NET_PARAM_MTU;
444 	else if (attr == &dev_attr_iface_port.attr)
445 		param = ISCSI_NET_PARAM_PORT;
446 	else if (attr == &dev_attr_iface_ipaddress_state.attr)
447 		param = ISCSI_NET_PARAM_IPADDR_STATE;
448 	else if (attr == &dev_attr_iface_delayed_ack_en.attr)
449 		param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
450 	else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
451 		param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
452 	else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
453 		param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
454 	else if (attr == &dev_attr_iface_tcp_wsf.attr)
455 		param = ISCSI_NET_PARAM_TCP_WSF;
456 	else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
457 		param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
458 	else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
459 		param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
460 	else if (attr == &dev_attr_iface_cache_id.attr)
461 		param = ISCSI_NET_PARAM_CACHE_ID;
462 	else if (attr == &dev_attr_iface_redirect_en.attr)
463 		param = ISCSI_NET_PARAM_REDIRECT_EN;
464 	else if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
465 		param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
466 	else if (attr == &dev_attr_iface_header_digest.attr)
467 		param = ISCSI_IFACE_PARAM_HDRDGST_EN;
468 	else if (attr == &dev_attr_iface_data_digest.attr)
469 		param = ISCSI_IFACE_PARAM_DATADGST_EN;
470 	else if (attr == &dev_attr_iface_immediate_data.attr)
471 		param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
472 	else if (attr == &dev_attr_iface_initial_r2t.attr)
473 		param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
474 	else if (attr == &dev_attr_iface_data_seq_in_order.attr)
475 		param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
476 	else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
477 		param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
478 	else if (attr == &dev_attr_iface_erl.attr)
479 		param = ISCSI_IFACE_PARAM_ERL;
480 	else if (attr == &dev_attr_iface_max_recv_dlength.attr)
481 		param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
482 	else if (attr == &dev_attr_iface_first_burst_len.attr)
483 		param = ISCSI_IFACE_PARAM_FIRST_BURST;
484 	else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
485 		param = ISCSI_IFACE_PARAM_MAX_R2T;
486 	else if (attr == &dev_attr_iface_max_burst_len.attr)
487 		param = ISCSI_IFACE_PARAM_MAX_BURST;
488 	else if (attr == &dev_attr_iface_chap_auth.attr)
489 		param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
490 	else if (attr == &dev_attr_iface_bidi_chap.attr)
491 		param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
492 	else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
493 		param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
494 	else if (attr == &dev_attr_iface_discovery_logout.attr)
495 		param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
496 	else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
497 		param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
498 	else if (attr == &dev_attr_iface_initiator_name.attr)
499 		param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
500 	else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
501 		if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
502 			param = ISCSI_NET_PARAM_IPV4_ADDR;
503 		else if (attr == &dev_attr_ipv4_iface_gateway.attr)
504 			param = ISCSI_NET_PARAM_IPV4_GW;
505 		else if (attr == &dev_attr_ipv4_iface_subnet.attr)
506 			param = ISCSI_NET_PARAM_IPV4_SUBNET;
507 		else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
508 			param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
509 		else if (attr ==
510 			 &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
511 			param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
512 		else if (attr ==
513 			 &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
514 			param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
515 		else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
516 			param = ISCSI_NET_PARAM_IPV4_TOS_EN;
517 		else if (attr == &dev_attr_ipv4_iface_tos.attr)
518 			param = ISCSI_NET_PARAM_IPV4_TOS;
519 		else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
520 			param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
521 		else if (attr ==
522 			 &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
523 			param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
524 		else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
525 			param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
526 		else if (attr ==
527 			 &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
528 			param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
529 		else if (attr ==
530 			 &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
531 			param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
532 		else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
533 			param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
534 		else if (attr ==
535 			 &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
536 			param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
537 		else if (attr ==
538 			 &dev_attr_ipv4_iface_fragment_disable.attr)
539 			param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
540 		else if (attr ==
541 			 &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
542 			param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
543 		else if (attr == &dev_attr_ipv4_iface_ttl.attr)
544 			param = ISCSI_NET_PARAM_IPV4_TTL;
545 		else
546 			return 0;
547 	} else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
548 		if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
549 			param = ISCSI_NET_PARAM_IPV6_ADDR;
550 		else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
551 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
552 		else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
553 			param = ISCSI_NET_PARAM_IPV6_ROUTER;
554 		else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
555 			param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
556 		else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
557 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
558 		else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
559 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
560 		else if (attr == &dev_attr_ipv6_iface_router_state.attr)
561 			param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
562 		else if (attr ==
563 			 &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
564 			param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
565 		else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
566 			param = ISCSI_NET_PARAM_IPV6_MLD_EN;
567 		else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
568 			param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
569 		else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
570 			param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
571 		else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
572 			param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
573 		else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
574 			param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
575 		else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
576 			param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
577 		else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
578 			param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
579 		else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
580 			param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
581 		else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
582 			param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
583 		else
584 			return 0;
585 	} else {
586 		WARN_ONCE(1, "Invalid iface attr");
587 		return 0;
588 	}
589 
590 	switch (param) {
591 	case ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO:
592 	case ISCSI_IFACE_PARAM_HDRDGST_EN:
593 	case ISCSI_IFACE_PARAM_DATADGST_EN:
594 	case ISCSI_IFACE_PARAM_IMM_DATA_EN:
595 	case ISCSI_IFACE_PARAM_INITIAL_R2T_EN:
596 	case ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN:
597 	case ISCSI_IFACE_PARAM_PDU_INORDER_EN:
598 	case ISCSI_IFACE_PARAM_ERL:
599 	case ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH:
600 	case ISCSI_IFACE_PARAM_FIRST_BURST:
601 	case ISCSI_IFACE_PARAM_MAX_R2T:
602 	case ISCSI_IFACE_PARAM_MAX_BURST:
603 	case ISCSI_IFACE_PARAM_CHAP_AUTH_EN:
604 	case ISCSI_IFACE_PARAM_BIDI_CHAP_EN:
605 	case ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL:
606 	case ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN:
607 	case ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN:
608 	case ISCSI_IFACE_PARAM_INITIATOR_NAME:
609 		param_type = ISCSI_IFACE_PARAM;
610 		break;
611 	default:
612 		param_type = ISCSI_NET_PARAM;
613 	}
614 
615 	return t->attr_is_visible(param_type, param);
616 }
617 
618 static struct attribute *iscsi_iface_attrs[] = {
619 	&dev_attr_iface_enabled.attr,
620 	&dev_attr_iface_vlan_id.attr,
621 	&dev_attr_iface_vlan_priority.attr,
622 	&dev_attr_iface_vlan_enabled.attr,
623 	&dev_attr_ipv4_iface_ipaddress.attr,
624 	&dev_attr_ipv4_iface_gateway.attr,
625 	&dev_attr_ipv4_iface_subnet.attr,
626 	&dev_attr_ipv4_iface_bootproto.attr,
627 	&dev_attr_ipv6_iface_ipaddress.attr,
628 	&dev_attr_ipv6_iface_link_local_addr.attr,
629 	&dev_attr_ipv6_iface_router_addr.attr,
630 	&dev_attr_ipv6_iface_ipaddr_autocfg.attr,
631 	&dev_attr_ipv6_iface_link_local_autocfg.attr,
632 	&dev_attr_iface_mtu.attr,
633 	&dev_attr_iface_port.attr,
634 	&dev_attr_iface_ipaddress_state.attr,
635 	&dev_attr_iface_delayed_ack_en.attr,
636 	&dev_attr_iface_tcp_nagle_disable.attr,
637 	&dev_attr_iface_tcp_wsf_disable.attr,
638 	&dev_attr_iface_tcp_wsf.attr,
639 	&dev_attr_iface_tcp_timer_scale.attr,
640 	&dev_attr_iface_tcp_timestamp_en.attr,
641 	&dev_attr_iface_cache_id.attr,
642 	&dev_attr_iface_redirect_en.attr,
643 	&dev_attr_iface_def_taskmgmt_tmo.attr,
644 	&dev_attr_iface_header_digest.attr,
645 	&dev_attr_iface_data_digest.attr,
646 	&dev_attr_iface_immediate_data.attr,
647 	&dev_attr_iface_initial_r2t.attr,
648 	&dev_attr_iface_data_seq_in_order.attr,
649 	&dev_attr_iface_data_pdu_in_order.attr,
650 	&dev_attr_iface_erl.attr,
651 	&dev_attr_iface_max_recv_dlength.attr,
652 	&dev_attr_iface_first_burst_len.attr,
653 	&dev_attr_iface_max_outstanding_r2t.attr,
654 	&dev_attr_iface_max_burst_len.attr,
655 	&dev_attr_iface_chap_auth.attr,
656 	&dev_attr_iface_bidi_chap.attr,
657 	&dev_attr_iface_discovery_auth_optional.attr,
658 	&dev_attr_iface_discovery_logout.attr,
659 	&dev_attr_iface_strict_login_comp_en.attr,
660 	&dev_attr_iface_initiator_name.attr,
661 	&dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
662 	&dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
663 	&dev_attr_ipv4_iface_tos_en.attr,
664 	&dev_attr_ipv4_iface_tos.attr,
665 	&dev_attr_ipv4_iface_grat_arp_en.attr,
666 	&dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
667 	&dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
668 	&dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
669 	&dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
670 	&dev_attr_ipv4_iface_dhcp_vendor_id.attr,
671 	&dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
672 	&dev_attr_ipv4_iface_fragment_disable.attr,
673 	&dev_attr_ipv4_iface_incoming_forwarding_en.attr,
674 	&dev_attr_ipv4_iface_ttl.attr,
675 	&dev_attr_ipv6_iface_link_local_state.attr,
676 	&dev_attr_ipv6_iface_router_state.attr,
677 	&dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
678 	&dev_attr_ipv6_iface_mld_en.attr,
679 	&dev_attr_ipv6_iface_flow_label.attr,
680 	&dev_attr_ipv6_iface_traffic_class.attr,
681 	&dev_attr_ipv6_iface_hop_limit.attr,
682 	&dev_attr_ipv6_iface_nd_reachable_tmo.attr,
683 	&dev_attr_ipv6_iface_nd_rexmit_time.attr,
684 	&dev_attr_ipv6_iface_nd_stale_tmo.attr,
685 	&dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
686 	&dev_attr_ipv6_iface_router_adv_link_mtu.attr,
687 	NULL,
688 };
689 
690 static struct attribute_group iscsi_iface_group = {
691 	.attrs = iscsi_iface_attrs,
692 	.is_visible = iscsi_iface_attr_is_visible,
693 };
694 
695 /* convert iscsi_ipaddress_state values to ascii string name */
696 static const struct {
697 	enum iscsi_ipaddress_state	value;
698 	char				*name;
699 } iscsi_ipaddress_state_names[] = {
700 	{ISCSI_IPDDRESS_STATE_UNCONFIGURED,	"Unconfigured" },
701 	{ISCSI_IPDDRESS_STATE_ACQUIRING,	"Acquiring" },
702 	{ISCSI_IPDDRESS_STATE_TENTATIVE,	"Tentative" },
703 	{ISCSI_IPDDRESS_STATE_VALID,		"Valid" },
704 	{ISCSI_IPDDRESS_STATE_DISABLING,	"Disabling" },
705 	{ISCSI_IPDDRESS_STATE_INVALID,		"Invalid" },
706 	{ISCSI_IPDDRESS_STATE_DEPRECATED,	"Deprecated" },
707 };
708 
709 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
710 {
711 	int i;
712 	char *state = NULL;
713 
714 	for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
715 		if (iscsi_ipaddress_state_names[i].value == port_state) {
716 			state = iscsi_ipaddress_state_names[i].name;
717 			break;
718 		}
719 	}
720 	return state;
721 }
722 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
723 
724 /* convert iscsi_router_state values to ascii string name */
725 static const struct {
726 	enum iscsi_router_state	value;
727 	char			*name;
728 } iscsi_router_state_names[] = {
729 	{ISCSI_ROUTER_STATE_UNKNOWN,		"Unknown" },
730 	{ISCSI_ROUTER_STATE_ADVERTISED,		"Advertised" },
731 	{ISCSI_ROUTER_STATE_MANUAL,		"Manual" },
732 	{ISCSI_ROUTER_STATE_STALE,		"Stale" },
733 };
734 
735 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
736 {
737 	int i;
738 	char *state = NULL;
739 
740 	for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
741 		if (iscsi_router_state_names[i].value == router_state) {
742 			state = iscsi_router_state_names[i].name;
743 			break;
744 		}
745 	}
746 	return state;
747 }
748 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
749 
750 struct iscsi_iface *
751 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
752 		   uint32_t iface_type, uint32_t iface_num, int dd_size)
753 {
754 	struct iscsi_iface *iface;
755 	int err;
756 
757 	iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
758 	if (!iface)
759 		return NULL;
760 
761 	iface->transport = transport;
762 	iface->iface_type = iface_type;
763 	iface->iface_num = iface_num;
764 	iface->dev.release = iscsi_iface_release;
765 	iface->dev.class = &iscsi_iface_class;
766 	/* parent reference released in iscsi_iface_release */
767 	iface->dev.parent = get_device(&shost->shost_gendev);
768 	if (iface_type == ISCSI_IFACE_TYPE_IPV4)
769 		dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
770 			     iface_num);
771 	else
772 		dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
773 			     iface_num);
774 
775 	err = device_register(&iface->dev);
776 	if (err)
777 		goto free_iface;
778 
779 	err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
780 	if (err)
781 		goto unreg_iface;
782 
783 	if (dd_size)
784 		iface->dd_data = &iface[1];
785 	return iface;
786 
787 unreg_iface:
788 	device_unregister(&iface->dev);
789 	return NULL;
790 
791 free_iface:
792 	put_device(iface->dev.parent);
793 	kfree(iface);
794 	return NULL;
795 }
796 EXPORT_SYMBOL_GPL(iscsi_create_iface);
797 
798 void iscsi_destroy_iface(struct iscsi_iface *iface)
799 {
800 	sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
801 	device_unregister(&iface->dev);
802 }
803 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
804 
805 /*
806  * Interface to display flash node params to sysfs
807  */
808 
809 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)	\
810 struct device_attribute dev_attr_##_prefix##_##_name =			\
811 	__ATTR(_name, _mode, _show, _store)
812 
813 /* flash node session attrs show */
814 #define iscsi_flashnode_sess_attr_show(type, name, param)		\
815 static ssize_t								\
816 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
817 		     char *buf)						\
818 {									\
819 	struct iscsi_bus_flash_session *fnode_sess =			\
820 					iscsi_dev_to_flash_session(dev);\
821 	struct iscsi_transport *t = fnode_sess->transport;		\
822 	return t->get_flashnode_param(fnode_sess, param, buf);		\
823 }									\
824 
825 
826 #define iscsi_flashnode_sess_attr(type, name, param)			\
827 	iscsi_flashnode_sess_attr_show(type, name, param)		\
828 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,			\
829 			    show_##type##_##name, NULL);
830 
831 /* Flash node session attributes */
832 
833 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
834 			  ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
835 iscsi_flashnode_sess_attr(fnode, discovery_session,
836 			  ISCSI_FLASHNODE_DISCOVERY_SESS);
837 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
838 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
839 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
840 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
841 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
842 			  ISCSI_FLASHNODE_DATASEQ_INORDER);
843 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
844 			  ISCSI_FLASHNODE_PDU_INORDER);
845 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
846 iscsi_flashnode_sess_attr(fnode, discovery_logout,
847 			  ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
848 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
849 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
850 			  ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
851 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
852 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
853 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
854 iscsi_flashnode_sess_attr(fnode, def_time2retain,
855 			  ISCSI_FLASHNODE_DEF_TIME2RETAIN);
856 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
857 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
858 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
859 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
860 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
861 			  ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
862 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
863 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
864 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
865 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
866 			  ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
867 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
868 			  ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
869 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
870 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
871 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
872 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
873 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
874 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
875 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
876 
877 static struct attribute *iscsi_flashnode_sess_attrs[] = {
878 	&dev_attr_fnode_auto_snd_tgt_disable.attr,
879 	&dev_attr_fnode_discovery_session.attr,
880 	&dev_attr_fnode_portal_type.attr,
881 	&dev_attr_fnode_entry_enable.attr,
882 	&dev_attr_fnode_immediate_data.attr,
883 	&dev_attr_fnode_initial_r2t.attr,
884 	&dev_attr_fnode_data_seq_in_order.attr,
885 	&dev_attr_fnode_data_pdu_in_order.attr,
886 	&dev_attr_fnode_chap_auth.attr,
887 	&dev_attr_fnode_discovery_logout.attr,
888 	&dev_attr_fnode_bidi_chap.attr,
889 	&dev_attr_fnode_discovery_auth_optional.attr,
890 	&dev_attr_fnode_erl.attr,
891 	&dev_attr_fnode_first_burst_len.attr,
892 	&dev_attr_fnode_def_time2wait.attr,
893 	&dev_attr_fnode_def_time2retain.attr,
894 	&dev_attr_fnode_max_outstanding_r2t.attr,
895 	&dev_attr_fnode_isid.attr,
896 	&dev_attr_fnode_tsid.attr,
897 	&dev_attr_fnode_max_burst_len.attr,
898 	&dev_attr_fnode_def_taskmgmt_tmo.attr,
899 	&dev_attr_fnode_targetalias.attr,
900 	&dev_attr_fnode_targetname.attr,
901 	&dev_attr_fnode_tpgt.attr,
902 	&dev_attr_fnode_discovery_parent_idx.attr,
903 	&dev_attr_fnode_discovery_parent_type.attr,
904 	&dev_attr_fnode_chap_in_idx.attr,
905 	&dev_attr_fnode_chap_out_idx.attr,
906 	&dev_attr_fnode_username.attr,
907 	&dev_attr_fnode_username_in.attr,
908 	&dev_attr_fnode_password.attr,
909 	&dev_attr_fnode_password_in.attr,
910 	&dev_attr_fnode_is_boot_target.attr,
911 	NULL,
912 };
913 
914 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
915 						    struct attribute *attr,
916 						    int i)
917 {
918 	struct device *dev = container_of(kobj, struct device, kobj);
919 	struct iscsi_bus_flash_session *fnode_sess =
920 						iscsi_dev_to_flash_session(dev);
921 	struct iscsi_transport *t = fnode_sess->transport;
922 	int param;
923 
924 	if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
925 		param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
926 	} else if (attr == &dev_attr_fnode_discovery_session.attr) {
927 		param = ISCSI_FLASHNODE_DISCOVERY_SESS;
928 	} else if (attr == &dev_attr_fnode_portal_type.attr) {
929 		param = ISCSI_FLASHNODE_PORTAL_TYPE;
930 	} else if (attr == &dev_attr_fnode_entry_enable.attr) {
931 		param = ISCSI_FLASHNODE_ENTRY_EN;
932 	} else if (attr == &dev_attr_fnode_immediate_data.attr) {
933 		param = ISCSI_FLASHNODE_IMM_DATA_EN;
934 	} else if (attr == &dev_attr_fnode_initial_r2t.attr) {
935 		param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
936 	} else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
937 		param = ISCSI_FLASHNODE_DATASEQ_INORDER;
938 	} else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
939 		param = ISCSI_FLASHNODE_PDU_INORDER;
940 	} else if (attr == &dev_attr_fnode_chap_auth.attr) {
941 		param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
942 	} else if (attr == &dev_attr_fnode_discovery_logout.attr) {
943 		param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
944 	} else if (attr == &dev_attr_fnode_bidi_chap.attr) {
945 		param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
946 	} else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
947 		param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
948 	} else if (attr == &dev_attr_fnode_erl.attr) {
949 		param = ISCSI_FLASHNODE_ERL;
950 	} else if (attr == &dev_attr_fnode_first_burst_len.attr) {
951 		param = ISCSI_FLASHNODE_FIRST_BURST;
952 	} else if (attr == &dev_attr_fnode_def_time2wait.attr) {
953 		param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
954 	} else if (attr == &dev_attr_fnode_def_time2retain.attr) {
955 		param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
956 	} else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
957 		param = ISCSI_FLASHNODE_MAX_R2T;
958 	} else if (attr == &dev_attr_fnode_isid.attr) {
959 		param = ISCSI_FLASHNODE_ISID;
960 	} else if (attr == &dev_attr_fnode_tsid.attr) {
961 		param = ISCSI_FLASHNODE_TSID;
962 	} else if (attr == &dev_attr_fnode_max_burst_len.attr) {
963 		param = ISCSI_FLASHNODE_MAX_BURST;
964 	} else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
965 		param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
966 	} else if (attr == &dev_attr_fnode_targetalias.attr) {
967 		param = ISCSI_FLASHNODE_ALIAS;
968 	} else if (attr == &dev_attr_fnode_targetname.attr) {
969 		param = ISCSI_FLASHNODE_NAME;
970 	} else if (attr == &dev_attr_fnode_tpgt.attr) {
971 		param = ISCSI_FLASHNODE_TPGT;
972 	} else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
973 		param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
974 	} else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
975 		param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
976 	} else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
977 		param = ISCSI_FLASHNODE_CHAP_IN_IDX;
978 	} else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
979 		param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
980 	} else if (attr == &dev_attr_fnode_username.attr) {
981 		param = ISCSI_FLASHNODE_USERNAME;
982 	} else if (attr == &dev_attr_fnode_username_in.attr) {
983 		param = ISCSI_FLASHNODE_USERNAME_IN;
984 	} else if (attr == &dev_attr_fnode_password.attr) {
985 		param = ISCSI_FLASHNODE_PASSWORD;
986 	} else if (attr == &dev_attr_fnode_password_in.attr) {
987 		param = ISCSI_FLASHNODE_PASSWORD_IN;
988 	} else if (attr == &dev_attr_fnode_is_boot_target.attr) {
989 		param = ISCSI_FLASHNODE_IS_BOOT_TGT;
990 	} else {
991 		WARN_ONCE(1, "Invalid flashnode session attr");
992 		return 0;
993 	}
994 
995 	return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
996 }
997 
998 static struct attribute_group iscsi_flashnode_sess_attr_group = {
999 	.attrs = iscsi_flashnode_sess_attrs,
1000 	.is_visible = iscsi_flashnode_sess_attr_is_visible,
1001 };
1002 
1003 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
1004 	&iscsi_flashnode_sess_attr_group,
1005 	NULL,
1006 };
1007 
1008 static void iscsi_flashnode_sess_release(struct device *dev)
1009 {
1010 	struct iscsi_bus_flash_session *fnode_sess =
1011 						iscsi_dev_to_flash_session(dev);
1012 
1013 	kfree(fnode_sess->targetname);
1014 	kfree(fnode_sess->targetalias);
1015 	kfree(fnode_sess->portal_type);
1016 	kfree(fnode_sess);
1017 }
1018 
1019 static const struct device_type iscsi_flashnode_sess_dev_type = {
1020 	.name = "iscsi_flashnode_sess_dev_type",
1021 	.groups = iscsi_flashnode_sess_attr_groups,
1022 	.release = iscsi_flashnode_sess_release,
1023 };
1024 
1025 /* flash node connection attrs show */
1026 #define iscsi_flashnode_conn_attr_show(type, name, param)		\
1027 static ssize_t								\
1028 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
1029 		     char *buf)						\
1030 {									\
1031 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1032 	struct iscsi_bus_flash_session *fnode_sess =			\
1033 				iscsi_flash_conn_to_flash_session(fnode_conn);\
1034 	struct iscsi_transport *t = fnode_conn->transport;		\
1035 	return t->get_flashnode_param(fnode_sess, param, buf);		\
1036 }									\
1037 
1038 
1039 #define iscsi_flashnode_conn_attr(type, name, param)			\
1040 	iscsi_flashnode_conn_attr_show(type, name, param)		\
1041 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,			\
1042 			    show_##type##_##name, NULL);
1043 
1044 /* Flash node connection attributes */
1045 
1046 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1047 			  ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1048 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1049 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1050 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1051 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1052 			  ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1053 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1054 			  ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1055 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1056 			  ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1057 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1058 			  ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1059 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1060 			  ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1061 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1062 			  ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1063 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1064 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1065 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1066 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1067 			  ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1068 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1069 			  ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1070 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1071 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1072 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1073 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1074 			  ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1075 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1076 			  ISCSI_FLASHNODE_REDIRECT_IPADDR);
1077 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1078 			  ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1079 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1080 			  ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1081 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1082 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1083 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1084 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1085 
1086 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1087 	&dev_attr_fnode_is_fw_assigned_ipv6.attr,
1088 	&dev_attr_fnode_header_digest.attr,
1089 	&dev_attr_fnode_data_digest.attr,
1090 	&dev_attr_fnode_snack_req.attr,
1091 	&dev_attr_fnode_tcp_timestamp_stat.attr,
1092 	&dev_attr_fnode_tcp_nagle_disable.attr,
1093 	&dev_attr_fnode_tcp_wsf_disable.attr,
1094 	&dev_attr_fnode_tcp_timer_scale.attr,
1095 	&dev_attr_fnode_tcp_timestamp_enable.attr,
1096 	&dev_attr_fnode_fragment_disable.attr,
1097 	&dev_attr_fnode_max_recv_dlength.attr,
1098 	&dev_attr_fnode_max_xmit_dlength.attr,
1099 	&dev_attr_fnode_keepalive_tmo.attr,
1100 	&dev_attr_fnode_port.attr,
1101 	&dev_attr_fnode_ipaddress.attr,
1102 	&dev_attr_fnode_redirect_ipaddr.attr,
1103 	&dev_attr_fnode_max_segment_size.attr,
1104 	&dev_attr_fnode_local_port.attr,
1105 	&dev_attr_fnode_ipv4_tos.attr,
1106 	&dev_attr_fnode_ipv6_traffic_class.attr,
1107 	&dev_attr_fnode_ipv6_flow_label.attr,
1108 	&dev_attr_fnode_link_local_ipv6.attr,
1109 	&dev_attr_fnode_tcp_xmit_wsf.attr,
1110 	&dev_attr_fnode_tcp_recv_wsf.attr,
1111 	&dev_attr_fnode_statsn.attr,
1112 	&dev_attr_fnode_exp_statsn.attr,
1113 	NULL,
1114 };
1115 
1116 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1117 						    struct attribute *attr,
1118 						    int i)
1119 {
1120 	struct device *dev = container_of(kobj, struct device, kobj);
1121 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1122 	struct iscsi_transport *t = fnode_conn->transport;
1123 	int param;
1124 
1125 	if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1126 		param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1127 	} else if (attr == &dev_attr_fnode_header_digest.attr) {
1128 		param = ISCSI_FLASHNODE_HDR_DGST_EN;
1129 	} else if (attr == &dev_attr_fnode_data_digest.attr) {
1130 		param = ISCSI_FLASHNODE_DATA_DGST_EN;
1131 	} else if (attr == &dev_attr_fnode_snack_req.attr) {
1132 		param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1133 	} else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1134 		param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1135 	} else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1136 		param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1137 	} else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1138 		param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1139 	} else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1140 		param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1141 	} else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1142 		param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1143 	} else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1144 		param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1145 	} else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1146 		param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1147 	} else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1148 		param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1149 	} else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1150 		param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1151 	} else if (attr == &dev_attr_fnode_port.attr) {
1152 		param = ISCSI_FLASHNODE_PORT;
1153 	} else if (attr == &dev_attr_fnode_ipaddress.attr) {
1154 		param = ISCSI_FLASHNODE_IPADDR;
1155 	} else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1156 		param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1157 	} else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1158 		param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1159 	} else if (attr == &dev_attr_fnode_local_port.attr) {
1160 		param = ISCSI_FLASHNODE_LOCAL_PORT;
1161 	} else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1162 		param = ISCSI_FLASHNODE_IPV4_TOS;
1163 	} else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1164 		param = ISCSI_FLASHNODE_IPV6_TC;
1165 	} else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1166 		param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1167 	} else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1168 		param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1169 	} else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1170 		param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1171 	} else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1172 		param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1173 	} else if (attr == &dev_attr_fnode_statsn.attr) {
1174 		param = ISCSI_FLASHNODE_STATSN;
1175 	} else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1176 		param = ISCSI_FLASHNODE_EXP_STATSN;
1177 	} else {
1178 		WARN_ONCE(1, "Invalid flashnode connection attr");
1179 		return 0;
1180 	}
1181 
1182 	return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1183 }
1184 
1185 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1186 	.attrs = iscsi_flashnode_conn_attrs,
1187 	.is_visible = iscsi_flashnode_conn_attr_is_visible,
1188 };
1189 
1190 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1191 	&iscsi_flashnode_conn_attr_group,
1192 	NULL,
1193 };
1194 
1195 static void iscsi_flashnode_conn_release(struct device *dev)
1196 {
1197 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1198 
1199 	kfree(fnode_conn->ipaddress);
1200 	kfree(fnode_conn->redirect_ipaddr);
1201 	kfree(fnode_conn->link_local_ipv6_addr);
1202 	kfree(fnode_conn);
1203 }
1204 
1205 static const struct device_type iscsi_flashnode_conn_dev_type = {
1206 	.name = "iscsi_flashnode_conn_dev_type",
1207 	.groups = iscsi_flashnode_conn_attr_groups,
1208 	.release = iscsi_flashnode_conn_release,
1209 };
1210 
1211 static struct bus_type iscsi_flashnode_bus;
1212 
1213 int iscsi_flashnode_bus_match(struct device *dev,
1214 				     struct device_driver *drv)
1215 {
1216 	if (dev->bus == &iscsi_flashnode_bus)
1217 		return 1;
1218 	return 0;
1219 }
1220 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1221 
1222 static struct bus_type iscsi_flashnode_bus = {
1223 	.name = "iscsi_flashnode",
1224 	.match = &iscsi_flashnode_bus_match,
1225 };
1226 
1227 /**
1228  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1229  * @shost: pointer to host data
1230  * @index: index of flashnode to add in sysfs
1231  * @transport: pointer to transport data
1232  * @dd_size: total size to allocate
1233  *
1234  * Adds a sysfs entry for the flashnode session attributes
1235  *
1236  * Returns:
1237  *  pointer to allocated flashnode sess on success
1238  *  %NULL on failure
1239  */
1240 struct iscsi_bus_flash_session *
1241 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1242 			    struct iscsi_transport *transport,
1243 			    int dd_size)
1244 {
1245 	struct iscsi_bus_flash_session *fnode_sess;
1246 	int err;
1247 
1248 	fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1249 	if (!fnode_sess)
1250 		return NULL;
1251 
1252 	fnode_sess->transport = transport;
1253 	fnode_sess->target_id = index;
1254 	fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1255 	fnode_sess->dev.bus = &iscsi_flashnode_bus;
1256 	fnode_sess->dev.parent = &shost->shost_gendev;
1257 	dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1258 		     shost->host_no, index);
1259 
1260 	err = device_register(&fnode_sess->dev);
1261 	if (err)
1262 		goto free_fnode_sess;
1263 
1264 	if (dd_size)
1265 		fnode_sess->dd_data = &fnode_sess[1];
1266 
1267 	return fnode_sess;
1268 
1269 free_fnode_sess:
1270 	kfree(fnode_sess);
1271 	return NULL;
1272 }
1273 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1274 
1275 /**
1276  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1277  * @shost: pointer to host data
1278  * @fnode_sess: pointer to the parent flashnode session entry
1279  * @transport: pointer to transport data
1280  * @dd_size: total size to allocate
1281  *
1282  * Adds a sysfs entry for the flashnode connection attributes
1283  *
1284  * Returns:
1285  *  pointer to allocated flashnode conn on success
1286  *  %NULL on failure
1287  */
1288 struct iscsi_bus_flash_conn *
1289 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1290 			    struct iscsi_bus_flash_session *fnode_sess,
1291 			    struct iscsi_transport *transport,
1292 			    int dd_size)
1293 {
1294 	struct iscsi_bus_flash_conn *fnode_conn;
1295 	int err;
1296 
1297 	fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1298 	if (!fnode_conn)
1299 		return NULL;
1300 
1301 	fnode_conn->transport = transport;
1302 	fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1303 	fnode_conn->dev.bus = &iscsi_flashnode_bus;
1304 	fnode_conn->dev.parent = &fnode_sess->dev;
1305 	dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1306 		     shost->host_no, fnode_sess->target_id);
1307 
1308 	err = device_register(&fnode_conn->dev);
1309 	if (err)
1310 		goto free_fnode_conn;
1311 
1312 	if (dd_size)
1313 		fnode_conn->dd_data = &fnode_conn[1];
1314 
1315 	return fnode_conn;
1316 
1317 free_fnode_conn:
1318 	kfree(fnode_conn);
1319 	return NULL;
1320 }
1321 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1322 
1323 /**
1324  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1325  * @dev: device to verify
1326  * @data: pointer to data containing value to use for verification
1327  *
1328  * Verifies if the passed device is flashnode conn device
1329  *
1330  * Returns:
1331  *  1 on success
1332  *  0 on failure
1333  */
1334 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1335 {
1336 	return dev->bus == &iscsi_flashnode_bus;
1337 }
1338 
1339 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1340 {
1341 	device_unregister(&fnode_conn->dev);
1342 	return 0;
1343 }
1344 
1345 static int flashnode_match_index(struct device *dev, void *data)
1346 {
1347 	struct iscsi_bus_flash_session *fnode_sess = NULL;
1348 	int ret = 0;
1349 
1350 	if (!iscsi_flashnode_bus_match(dev, NULL))
1351 		goto exit_match_index;
1352 
1353 	fnode_sess = iscsi_dev_to_flash_session(dev);
1354 	ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1355 
1356 exit_match_index:
1357 	return ret;
1358 }
1359 
1360 /**
1361  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1362  * @shost: pointer to host data
1363  * @idx: index to match
1364  *
1365  * Finds the flashnode session object for the passed index
1366  *
1367  * Returns:
1368  *  pointer to found flashnode session object on success
1369  *  %NULL on failure
1370  */
1371 static struct iscsi_bus_flash_session *
1372 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1373 {
1374 	struct iscsi_bus_flash_session *fnode_sess = NULL;
1375 	struct device *dev;
1376 
1377 	dev = device_find_child(&shost->shost_gendev, &idx,
1378 				flashnode_match_index);
1379 	if (dev)
1380 		fnode_sess = iscsi_dev_to_flash_session(dev);
1381 
1382 	return fnode_sess;
1383 }
1384 
1385 /**
1386  * iscsi_find_flashnode_sess - finds flashnode session entry
1387  * @shost: pointer to host data
1388  * @data: pointer to data containing value to use for comparison
1389  * @fn: function pointer that does actual comparison
1390  *
1391  * Finds the flashnode session object comparing the data passed using logic
1392  * defined in passed function pointer
1393  *
1394  * Returns:
1395  *  pointer to found flashnode session device object on success
1396  *  %NULL on failure
1397  */
1398 struct device *
1399 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1400 			  int (*fn)(struct device *dev, void *data))
1401 {
1402 	return device_find_child(&shost->shost_gendev, data, fn);
1403 }
1404 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1405 
1406 /**
1407  * iscsi_find_flashnode_conn - finds flashnode connection entry
1408  * @fnode_sess: pointer to parent flashnode session entry
1409  *
1410  * Finds the flashnode connection object comparing the data passed using logic
1411  * defined in passed function pointer
1412  *
1413  * Returns:
1414  *  pointer to found flashnode connection device object on success
1415  *  %NULL on failure
1416  */
1417 struct device *
1418 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1419 {
1420 	return device_find_child(&fnode_sess->dev, NULL,
1421 				 iscsi_is_flashnode_conn_dev);
1422 }
1423 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1424 
1425 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1426 {
1427 	if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1428 		return 0;
1429 
1430 	return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1431 }
1432 
1433 /**
1434  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1435  * @fnode_sess: pointer to flashnode session entry to be destroyed
1436  *
1437  * Deletes the flashnode session entry and all children flashnode connection
1438  * entries from sysfs
1439  */
1440 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1441 {
1442 	int err;
1443 
1444 	err = device_for_each_child(&fnode_sess->dev, NULL,
1445 				    iscsi_iter_destroy_flashnode_conn_fn);
1446 	if (err)
1447 		pr_err("Could not delete all connections for %s. Error %d.\n",
1448 		       fnode_sess->dev.kobj.name, err);
1449 
1450 	device_unregister(&fnode_sess->dev);
1451 }
1452 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1453 
1454 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1455 {
1456 	if (!iscsi_flashnode_bus_match(dev, NULL))
1457 		return 0;
1458 
1459 	iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1460 	return 0;
1461 }
1462 
1463 /**
1464  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1465  * @shost: pointer to host data
1466  *
1467  * Destroys all the flashnode session entries and all corresponding children
1468  * flashnode connection entries from sysfs
1469  */
1470 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1471 {
1472 	device_for_each_child(&shost->shost_gendev, NULL,
1473 			      iscsi_iter_destroy_flashnode_fn);
1474 }
1475 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1476 
1477 /*
1478  * BSG support
1479  */
1480 /**
1481  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1482  * @job: bsg job to be processed
1483  */
1484 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1485 {
1486 	struct Scsi_Host *shost = iscsi_job_to_shost(job);
1487 	struct iscsi_bsg_request *req = job->request;
1488 	struct iscsi_bsg_reply *reply = job->reply;
1489 	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1490 	int cmdlen = sizeof(uint32_t);	/* start with length of msgcode */
1491 	int ret;
1492 
1493 	/* check if we have the msgcode value at least */
1494 	if (job->request_len < sizeof(uint32_t)) {
1495 		ret = -ENOMSG;
1496 		goto fail_host_msg;
1497 	}
1498 
1499 	/* Validate the host command */
1500 	switch (req->msgcode) {
1501 	case ISCSI_BSG_HST_VENDOR:
1502 		cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1503 		if ((shost->hostt->vendor_id == 0L) ||
1504 		    (req->rqst_data.h_vendor.vendor_id !=
1505 			shost->hostt->vendor_id)) {
1506 			ret = -ESRCH;
1507 			goto fail_host_msg;
1508 		}
1509 		break;
1510 	default:
1511 		ret = -EBADR;
1512 		goto fail_host_msg;
1513 	}
1514 
1515 	/* check if we really have all the request data needed */
1516 	if (job->request_len < cmdlen) {
1517 		ret = -ENOMSG;
1518 		goto fail_host_msg;
1519 	}
1520 
1521 	ret = i->iscsi_transport->bsg_request(job);
1522 	if (!ret)
1523 		return 0;
1524 
1525 fail_host_msg:
1526 	/* return the errno failure code as the only status */
1527 	BUG_ON(job->reply_len < sizeof(uint32_t));
1528 	reply->reply_payload_rcv_len = 0;
1529 	reply->result = ret;
1530 	job->reply_len = sizeof(uint32_t);
1531 	bsg_job_done(job, ret, 0);
1532 	return 0;
1533 }
1534 
1535 /**
1536  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1537  * @shost: shost for iscsi_host
1538  * @ihost: iscsi_cls_host adding the structures to
1539  */
1540 static int
1541 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1542 {
1543 	struct device *dev = &shost->shost_gendev;
1544 	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1545 	struct request_queue *q;
1546 	char bsg_name[20];
1547 
1548 	if (!i->iscsi_transport->bsg_request)
1549 		return -ENOTSUPP;
1550 
1551 	snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1552 	q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1553 	if (IS_ERR(q)) {
1554 		shost_printk(KERN_ERR, shost, "bsg interface failed to "
1555 			     "initialize - no request queue\n");
1556 		return PTR_ERR(q);
1557 	}
1558 	__scsi_init_queue(shost, q);
1559 
1560 	ihost->bsg_q = q;
1561 	return 0;
1562 }
1563 
1564 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1565 			    struct device *cdev)
1566 {
1567 	struct Scsi_Host *shost = dev_to_shost(dev);
1568 	struct iscsi_cls_host *ihost = shost->shost_data;
1569 
1570 	memset(ihost, 0, sizeof(*ihost));
1571 	atomic_set(&ihost->nr_scans, 0);
1572 	mutex_init(&ihost->mutex);
1573 
1574 	iscsi_bsg_host_add(shost, ihost);
1575 	/* ignore any bsg add error - we just can't do sgio */
1576 
1577 	return 0;
1578 }
1579 
1580 static int iscsi_remove_host(struct transport_container *tc,
1581 			     struct device *dev, struct device *cdev)
1582 {
1583 	struct Scsi_Host *shost = dev_to_shost(dev);
1584 	struct iscsi_cls_host *ihost = shost->shost_data;
1585 
1586 	bsg_remove_queue(ihost->bsg_q);
1587 	return 0;
1588 }
1589 
1590 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1591 			       "iscsi_host",
1592 			       iscsi_setup_host,
1593 			       iscsi_remove_host,
1594 			       NULL);
1595 
1596 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1597 			       "iscsi_session",
1598 			       NULL,
1599 			       NULL,
1600 			       NULL);
1601 
1602 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1603 			       "iscsi_connection",
1604 			       NULL,
1605 			       NULL,
1606 			       NULL);
1607 
1608 static struct sock *nls;
1609 static DEFINE_MUTEX(rx_queue_mutex);
1610 
1611 static LIST_HEAD(sesslist);
1612 static DEFINE_SPINLOCK(sesslock);
1613 static LIST_HEAD(connlist);
1614 static DEFINE_SPINLOCK(connlock);
1615 
1616 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1617 {
1618 	struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1619 	return sess->sid;
1620 }
1621 
1622 /*
1623  * Returns the matching session to a given sid
1624  */
1625 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1626 {
1627 	unsigned long flags;
1628 	struct iscsi_cls_session *sess;
1629 
1630 	spin_lock_irqsave(&sesslock, flags);
1631 	list_for_each_entry(sess, &sesslist, sess_list) {
1632 		if (sess->sid == sid) {
1633 			spin_unlock_irqrestore(&sesslock, flags);
1634 			return sess;
1635 		}
1636 	}
1637 	spin_unlock_irqrestore(&sesslock, flags);
1638 	return NULL;
1639 }
1640 
1641 /*
1642  * Returns the matching connection to a given sid / cid tuple
1643  */
1644 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1645 {
1646 	unsigned long flags;
1647 	struct iscsi_cls_conn *conn;
1648 
1649 	spin_lock_irqsave(&connlock, flags);
1650 	list_for_each_entry(conn, &connlist, conn_list) {
1651 		if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1652 			spin_unlock_irqrestore(&connlock, flags);
1653 			return conn;
1654 		}
1655 	}
1656 	spin_unlock_irqrestore(&connlock, flags);
1657 	return NULL;
1658 }
1659 
1660 /*
1661  * The following functions can be used by LLDs that allocate
1662  * their own scsi_hosts or by software iscsi LLDs
1663  */
1664 static struct {
1665 	int value;
1666 	char *name;
1667 } iscsi_session_state_names[] = {
1668 	{ ISCSI_SESSION_LOGGED_IN,	"LOGGED_IN" },
1669 	{ ISCSI_SESSION_FAILED,		"FAILED" },
1670 	{ ISCSI_SESSION_FREE,		"FREE" },
1671 };
1672 
1673 static const char *iscsi_session_state_name(int state)
1674 {
1675 	int i;
1676 	char *name = NULL;
1677 
1678 	for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1679 		if (iscsi_session_state_names[i].value == state) {
1680 			name = iscsi_session_state_names[i].name;
1681 			break;
1682 		}
1683 	}
1684 	return name;
1685 }
1686 
1687 int iscsi_session_chkready(struct iscsi_cls_session *session)
1688 {
1689 	unsigned long flags;
1690 	int err;
1691 
1692 	spin_lock_irqsave(&session->lock, flags);
1693 	switch (session->state) {
1694 	case ISCSI_SESSION_LOGGED_IN:
1695 		err = 0;
1696 		break;
1697 	case ISCSI_SESSION_FAILED:
1698 		err = DID_IMM_RETRY << 16;
1699 		break;
1700 	case ISCSI_SESSION_FREE:
1701 		err = DID_TRANSPORT_FAILFAST << 16;
1702 		break;
1703 	default:
1704 		err = DID_NO_CONNECT << 16;
1705 		break;
1706 	}
1707 	spin_unlock_irqrestore(&session->lock, flags);
1708 	return err;
1709 }
1710 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1711 
1712 int iscsi_is_session_online(struct iscsi_cls_session *session)
1713 {
1714 	unsigned long flags;
1715 	int ret = 0;
1716 
1717 	spin_lock_irqsave(&session->lock, flags);
1718 	if (session->state == ISCSI_SESSION_LOGGED_IN)
1719 		ret = 1;
1720 	spin_unlock_irqrestore(&session->lock, flags);
1721 	return ret;
1722 }
1723 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1724 
1725 static void iscsi_session_release(struct device *dev)
1726 {
1727 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1728 	struct Scsi_Host *shost;
1729 
1730 	shost = iscsi_session_to_shost(session);
1731 	scsi_host_put(shost);
1732 	ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1733 	kfree(session);
1734 }
1735 
1736 int iscsi_is_session_dev(const struct device *dev)
1737 {
1738 	return dev->release == iscsi_session_release;
1739 }
1740 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1741 
1742 static int iscsi_iter_session_fn(struct device *dev, void *data)
1743 {
1744 	void (* fn) (struct iscsi_cls_session *) = data;
1745 
1746 	if (!iscsi_is_session_dev(dev))
1747 		return 0;
1748 	fn(iscsi_dev_to_session(dev));
1749 	return 0;
1750 }
1751 
1752 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1753 				 void (*fn)(struct iscsi_cls_session *))
1754 {
1755 	device_for_each_child(&shost->shost_gendev, fn,
1756 			      iscsi_iter_session_fn);
1757 }
1758 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1759 
1760 /**
1761  * iscsi_scan_finished - helper to report when running scans are done
1762  * @shost: scsi host
1763  * @time: scan run time
1764  *
1765  * This function can be used by drives like qla4xxx to report to the scsi
1766  * layer when the scans it kicked off at module load time are done.
1767  */
1768 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1769 {
1770 	struct iscsi_cls_host *ihost = shost->shost_data;
1771 	/*
1772 	 * qla4xxx will have kicked off some session unblocks before calling
1773 	 * scsi_scan_host, so just wait for them to complete.
1774 	 */
1775 	return !atomic_read(&ihost->nr_scans);
1776 }
1777 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1778 
1779 struct iscsi_scan_data {
1780 	unsigned int channel;
1781 	unsigned int id;
1782 	u64 lun;
1783 	enum scsi_scan_mode rescan;
1784 };
1785 
1786 static int iscsi_user_scan_session(struct device *dev, void *data)
1787 {
1788 	struct iscsi_scan_data *scan_data = data;
1789 	struct iscsi_cls_session *session;
1790 	struct Scsi_Host *shost;
1791 	struct iscsi_cls_host *ihost;
1792 	unsigned long flags;
1793 	unsigned int id;
1794 
1795 	if (!iscsi_is_session_dev(dev))
1796 		return 0;
1797 
1798 	session = iscsi_dev_to_session(dev);
1799 
1800 	ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1801 
1802 	shost = iscsi_session_to_shost(session);
1803 	ihost = shost->shost_data;
1804 
1805 	mutex_lock(&ihost->mutex);
1806 	spin_lock_irqsave(&session->lock, flags);
1807 	if (session->state != ISCSI_SESSION_LOGGED_IN) {
1808 		spin_unlock_irqrestore(&session->lock, flags);
1809 		goto user_scan_exit;
1810 	}
1811 	id = session->target_id;
1812 	spin_unlock_irqrestore(&session->lock, flags);
1813 
1814 	if (id != ISCSI_MAX_TARGET) {
1815 		if ((scan_data->channel == SCAN_WILD_CARD ||
1816 		     scan_data->channel == 0) &&
1817 		    (scan_data->id == SCAN_WILD_CARD ||
1818 		     scan_data->id == id))
1819 			scsi_scan_target(&session->dev, 0, id,
1820 					 scan_data->lun, scan_data->rescan);
1821 	}
1822 
1823 user_scan_exit:
1824 	mutex_unlock(&ihost->mutex);
1825 	ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1826 	return 0;
1827 }
1828 
1829 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1830 			   uint id, u64 lun)
1831 {
1832 	struct iscsi_scan_data scan_data;
1833 
1834 	scan_data.channel = channel;
1835 	scan_data.id = id;
1836 	scan_data.lun = lun;
1837 	scan_data.rescan = SCSI_SCAN_MANUAL;
1838 
1839 	return device_for_each_child(&shost->shost_gendev, &scan_data,
1840 				     iscsi_user_scan_session);
1841 }
1842 
1843 static void iscsi_scan_session(struct work_struct *work)
1844 {
1845 	struct iscsi_cls_session *session =
1846 			container_of(work, struct iscsi_cls_session, scan_work);
1847 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
1848 	struct iscsi_cls_host *ihost = shost->shost_data;
1849 	struct iscsi_scan_data scan_data;
1850 
1851 	scan_data.channel = 0;
1852 	scan_data.id = SCAN_WILD_CARD;
1853 	scan_data.lun = SCAN_WILD_CARD;
1854 	scan_data.rescan = SCSI_SCAN_RESCAN;
1855 
1856 	iscsi_user_scan_session(&session->dev, &scan_data);
1857 	atomic_dec(&ihost->nr_scans);
1858 }
1859 
1860 /**
1861  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1862  * @cmd: scsi cmd passed to scsi eh handler
1863  *
1864  * If the session is down this function will wait for the recovery
1865  * timer to fire or for the session to be logged back in. If the
1866  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1867  * should pass this error value to the scsi eh.
1868  */
1869 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1870 {
1871 	struct iscsi_cls_session *session =
1872 			starget_to_session(scsi_target(cmd->device));
1873 	unsigned long flags;
1874 	int ret = 0;
1875 
1876 	spin_lock_irqsave(&session->lock, flags);
1877 	while (session->state != ISCSI_SESSION_LOGGED_IN) {
1878 		if (session->state == ISCSI_SESSION_FREE) {
1879 			ret = FAST_IO_FAIL;
1880 			break;
1881 		}
1882 		spin_unlock_irqrestore(&session->lock, flags);
1883 		msleep(1000);
1884 		spin_lock_irqsave(&session->lock, flags);
1885 	}
1886 	spin_unlock_irqrestore(&session->lock, flags);
1887 	return ret;
1888 }
1889 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1890 
1891 static void session_recovery_timedout(struct work_struct *work)
1892 {
1893 	struct iscsi_cls_session *session =
1894 		container_of(work, struct iscsi_cls_session,
1895 			     recovery_work.work);
1896 	unsigned long flags;
1897 
1898 	iscsi_cls_session_printk(KERN_INFO, session,
1899 				 "session recovery timed out after %d secs\n",
1900 				 session->recovery_tmo);
1901 
1902 	spin_lock_irqsave(&session->lock, flags);
1903 	switch (session->state) {
1904 	case ISCSI_SESSION_FAILED:
1905 		session->state = ISCSI_SESSION_FREE;
1906 		break;
1907 	case ISCSI_SESSION_LOGGED_IN:
1908 	case ISCSI_SESSION_FREE:
1909 		/* we raced with the unblock's flush */
1910 		spin_unlock_irqrestore(&session->lock, flags);
1911 		return;
1912 	}
1913 	spin_unlock_irqrestore(&session->lock, flags);
1914 
1915 	if (session->transport->session_recovery_timedout)
1916 		session->transport->session_recovery_timedout(session);
1917 
1918 	ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1919 	scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1920 	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1921 }
1922 
1923 static void __iscsi_unblock_session(struct work_struct *work)
1924 {
1925 	struct iscsi_cls_session *session =
1926 			container_of(work, struct iscsi_cls_session,
1927 				     unblock_work);
1928 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
1929 	struct iscsi_cls_host *ihost = shost->shost_data;
1930 	unsigned long flags;
1931 
1932 	ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1933 	/*
1934 	 * The recovery and unblock work get run from the same workqueue,
1935 	 * so try to cancel it if it was going to run after this unblock.
1936 	 */
1937 	cancel_delayed_work(&session->recovery_work);
1938 	spin_lock_irqsave(&session->lock, flags);
1939 	session->state = ISCSI_SESSION_LOGGED_IN;
1940 	spin_unlock_irqrestore(&session->lock, flags);
1941 	/* start IO */
1942 	scsi_target_unblock(&session->dev, SDEV_RUNNING);
1943 	/*
1944 	 * Only do kernel scanning if the driver is properly hooked into
1945 	 * the async scanning code (drivers like iscsi_tcp do login and
1946 	 * scanning from userspace).
1947 	 */
1948 	if (shost->hostt->scan_finished) {
1949 		if (scsi_queue_work(shost, &session->scan_work))
1950 			atomic_inc(&ihost->nr_scans);
1951 	}
1952 	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1953 }
1954 
1955 /**
1956  * iscsi_unblock_session - set a session as logged in and start IO.
1957  * @session: iscsi session
1958  *
1959  * Mark a session as ready to accept IO.
1960  */
1961 void iscsi_unblock_session(struct iscsi_cls_session *session)
1962 {
1963 	queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1964 	/*
1965 	 * make sure all the events have completed before tell the driver
1966 	 * it is safe
1967 	 */
1968 	flush_workqueue(iscsi_eh_timer_workq);
1969 }
1970 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1971 
1972 static void __iscsi_block_session(struct work_struct *work)
1973 {
1974 	struct iscsi_cls_session *session =
1975 			container_of(work, struct iscsi_cls_session,
1976 				     block_work);
1977 	unsigned long flags;
1978 
1979 	ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1980 	spin_lock_irqsave(&session->lock, flags);
1981 	session->state = ISCSI_SESSION_FAILED;
1982 	spin_unlock_irqrestore(&session->lock, flags);
1983 	scsi_target_block(&session->dev);
1984 	ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1985 	if (session->recovery_tmo >= 0)
1986 		queue_delayed_work(iscsi_eh_timer_workq,
1987 				   &session->recovery_work,
1988 				   session->recovery_tmo * HZ);
1989 }
1990 
1991 void iscsi_block_session(struct iscsi_cls_session *session)
1992 {
1993 	queue_work(iscsi_eh_timer_workq, &session->block_work);
1994 }
1995 EXPORT_SYMBOL_GPL(iscsi_block_session);
1996 
1997 static void __iscsi_unbind_session(struct work_struct *work)
1998 {
1999 	struct iscsi_cls_session *session =
2000 			container_of(work, struct iscsi_cls_session,
2001 				     unbind_work);
2002 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
2003 	struct iscsi_cls_host *ihost = shost->shost_data;
2004 	unsigned long flags;
2005 	unsigned int target_id;
2006 
2007 	ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2008 
2009 	/* Prevent new scans and make sure scanning is not in progress */
2010 	mutex_lock(&ihost->mutex);
2011 	spin_lock_irqsave(&session->lock, flags);
2012 	if (session->target_id == ISCSI_MAX_TARGET) {
2013 		spin_unlock_irqrestore(&session->lock, flags);
2014 		mutex_unlock(&ihost->mutex);
2015 		return;
2016 	}
2017 
2018 	target_id = session->target_id;
2019 	session->target_id = ISCSI_MAX_TARGET;
2020 	spin_unlock_irqrestore(&session->lock, flags);
2021 	mutex_unlock(&ihost->mutex);
2022 
2023 	if (session->ida_used)
2024 		ida_simple_remove(&iscsi_sess_ida, target_id);
2025 
2026 	scsi_remove_target(&session->dev);
2027 	iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2028 	ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2029 }
2030 
2031 struct iscsi_cls_session *
2032 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2033 		    int dd_size)
2034 {
2035 	struct iscsi_cls_session *session;
2036 
2037 	session = kzalloc(sizeof(*session) + dd_size,
2038 			  GFP_KERNEL);
2039 	if (!session)
2040 		return NULL;
2041 
2042 	session->transport = transport;
2043 	session->creator = -1;
2044 	session->recovery_tmo = 120;
2045 	session->recovery_tmo_sysfs_override = false;
2046 	session->state = ISCSI_SESSION_FREE;
2047 	INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2048 	INIT_LIST_HEAD(&session->sess_list);
2049 	INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2050 	INIT_WORK(&session->block_work, __iscsi_block_session);
2051 	INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2052 	INIT_WORK(&session->scan_work, iscsi_scan_session);
2053 	spin_lock_init(&session->lock);
2054 
2055 	/* this is released in the dev's release function */
2056 	scsi_host_get(shost);
2057 	session->dev.parent = &shost->shost_gendev;
2058 	session->dev.release = iscsi_session_release;
2059 	device_initialize(&session->dev);
2060 	if (dd_size)
2061 		session->dd_data = &session[1];
2062 
2063 	ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2064 	return session;
2065 }
2066 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2067 
2068 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2069 {
2070 	unsigned long flags;
2071 	int id = 0;
2072 	int err;
2073 
2074 	session->sid = atomic_add_return(1, &iscsi_session_nr);
2075 
2076 	if (target_id == ISCSI_MAX_TARGET) {
2077 		id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2078 
2079 		if (id < 0) {
2080 			iscsi_cls_session_printk(KERN_ERR, session,
2081 					"Failure in Target ID Allocation\n");
2082 			return id;
2083 		}
2084 		session->target_id = (unsigned int)id;
2085 		session->ida_used = true;
2086 	} else
2087 		session->target_id = target_id;
2088 
2089 	dev_set_name(&session->dev, "session%u", session->sid);
2090 	err = device_add(&session->dev);
2091 	if (err) {
2092 		iscsi_cls_session_printk(KERN_ERR, session,
2093 					 "could not register session's dev\n");
2094 		goto release_ida;
2095 	}
2096 	err = transport_register_device(&session->dev);
2097 	if (err) {
2098 		iscsi_cls_session_printk(KERN_ERR, session,
2099 					 "could not register transport's dev\n");
2100 		goto release_dev;
2101 	}
2102 
2103 	spin_lock_irqsave(&sesslock, flags);
2104 	list_add(&session->sess_list, &sesslist);
2105 	spin_unlock_irqrestore(&sesslock, flags);
2106 
2107 	iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2108 	ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2109 	return 0;
2110 
2111 release_dev:
2112 	device_del(&session->dev);
2113 release_ida:
2114 	if (session->ida_used)
2115 		ida_simple_remove(&iscsi_sess_ida, session->target_id);
2116 
2117 	return err;
2118 }
2119 EXPORT_SYMBOL_GPL(iscsi_add_session);
2120 
2121 /**
2122  * iscsi_create_session - create iscsi class session
2123  * @shost: scsi host
2124  * @transport: iscsi transport
2125  * @dd_size: private driver data size
2126  * @target_id: which target
2127  *
2128  * This can be called from a LLD or iscsi_transport.
2129  */
2130 struct iscsi_cls_session *
2131 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2132 		     int dd_size, unsigned int target_id)
2133 {
2134 	struct iscsi_cls_session *session;
2135 
2136 	session = iscsi_alloc_session(shost, transport, dd_size);
2137 	if (!session)
2138 		return NULL;
2139 
2140 	if (iscsi_add_session(session, target_id)) {
2141 		iscsi_free_session(session);
2142 		return NULL;
2143 	}
2144 	return session;
2145 }
2146 EXPORT_SYMBOL_GPL(iscsi_create_session);
2147 
2148 static void iscsi_conn_release(struct device *dev)
2149 {
2150 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2151 	struct device *parent = conn->dev.parent;
2152 
2153 	ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2154 	kfree(conn);
2155 	put_device(parent);
2156 }
2157 
2158 static int iscsi_is_conn_dev(const struct device *dev)
2159 {
2160 	return dev->release == iscsi_conn_release;
2161 }
2162 
2163 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2164 {
2165 	if (!iscsi_is_conn_dev(dev))
2166 		return 0;
2167 	return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2168 }
2169 
2170 void iscsi_remove_session(struct iscsi_cls_session *session)
2171 {
2172 	unsigned long flags;
2173 	int err;
2174 
2175 	ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2176 
2177 	spin_lock_irqsave(&sesslock, flags);
2178 	list_del(&session->sess_list);
2179 	spin_unlock_irqrestore(&sesslock, flags);
2180 
2181 	/* make sure there are no blocks/unblocks queued */
2182 	flush_workqueue(iscsi_eh_timer_workq);
2183 	/* make sure the timedout callout is not running */
2184 	if (!cancel_delayed_work(&session->recovery_work))
2185 		flush_workqueue(iscsi_eh_timer_workq);
2186 	/*
2187 	 * If we are blocked let commands flow again. The lld or iscsi
2188 	 * layer should set up the queuecommand to fail commands.
2189 	 * We assume that LLD will not be calling block/unblock while
2190 	 * removing the session.
2191 	 */
2192 	spin_lock_irqsave(&session->lock, flags);
2193 	session->state = ISCSI_SESSION_FREE;
2194 	spin_unlock_irqrestore(&session->lock, flags);
2195 
2196 	scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2197 	/* flush running scans then delete devices */
2198 	flush_work(&session->scan_work);
2199 	/* flush running unbind operations */
2200 	flush_work(&session->unbind_work);
2201 	__iscsi_unbind_session(&session->unbind_work);
2202 
2203 	/* hw iscsi may not have removed all connections from session */
2204 	err = device_for_each_child(&session->dev, NULL,
2205 				    iscsi_iter_destroy_conn_fn);
2206 	if (err)
2207 		iscsi_cls_session_printk(KERN_ERR, session,
2208 					 "Could not delete all connections "
2209 					 "for session. Error %d.\n", err);
2210 
2211 	transport_unregister_device(&session->dev);
2212 
2213 	ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2214 	device_del(&session->dev);
2215 }
2216 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2217 
2218 void iscsi_free_session(struct iscsi_cls_session *session)
2219 {
2220 	ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2221 	iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2222 	put_device(&session->dev);
2223 }
2224 EXPORT_SYMBOL_GPL(iscsi_free_session);
2225 
2226 /**
2227  * iscsi_create_conn - create iscsi class connection
2228  * @session: iscsi cls session
2229  * @dd_size: private driver data size
2230  * @cid: connection id
2231  *
2232  * This can be called from a LLD or iscsi_transport. The connection
2233  * is child of the session so cid must be unique for all connections
2234  * on the session.
2235  *
2236  * Since we do not support MCS, cid will normally be zero. In some cases
2237  * for software iscsi we could be trying to preallocate a connection struct
2238  * in which case there could be two connection structs and cid would be
2239  * non-zero.
2240  */
2241 struct iscsi_cls_conn *
2242 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2243 {
2244 	struct iscsi_transport *transport = session->transport;
2245 	struct iscsi_cls_conn *conn;
2246 	unsigned long flags;
2247 	int err;
2248 
2249 	conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2250 	if (!conn)
2251 		return NULL;
2252 	if (dd_size)
2253 		conn->dd_data = &conn[1];
2254 
2255 	mutex_init(&conn->ep_mutex);
2256 	INIT_LIST_HEAD(&conn->conn_list);
2257 	conn->transport = transport;
2258 	conn->cid = cid;
2259 
2260 	/* this is released in the dev's release function */
2261 	if (!get_device(&session->dev))
2262 		goto free_conn;
2263 
2264 	dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2265 	conn->dev.parent = &session->dev;
2266 	conn->dev.release = iscsi_conn_release;
2267 	err = device_register(&conn->dev);
2268 	if (err) {
2269 		iscsi_cls_session_printk(KERN_ERR, session, "could not "
2270 					 "register connection's dev\n");
2271 		goto release_parent_ref;
2272 	}
2273 	err = transport_register_device(&conn->dev);
2274 	if (err) {
2275 		iscsi_cls_session_printk(KERN_ERR, session, "could not "
2276 					 "register transport's dev\n");
2277 		goto release_conn_ref;
2278 	}
2279 
2280 	spin_lock_irqsave(&connlock, flags);
2281 	list_add(&conn->conn_list, &connlist);
2282 	spin_unlock_irqrestore(&connlock, flags);
2283 
2284 	ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2285 	return conn;
2286 
2287 release_conn_ref:
2288 	put_device(&conn->dev);
2289 release_parent_ref:
2290 	put_device(&session->dev);
2291 free_conn:
2292 	kfree(conn);
2293 	return NULL;
2294 }
2295 
2296 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2297 
2298 /**
2299  * iscsi_destroy_conn - destroy iscsi class connection
2300  * @conn: iscsi cls session
2301  *
2302  * This can be called from a LLD or iscsi_transport.
2303  */
2304 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2305 {
2306 	unsigned long flags;
2307 
2308 	spin_lock_irqsave(&connlock, flags);
2309 	list_del(&conn->conn_list);
2310 	spin_unlock_irqrestore(&connlock, flags);
2311 
2312 	transport_unregister_device(&conn->dev);
2313 	ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2314 	device_unregister(&conn->dev);
2315 	return 0;
2316 }
2317 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2318 
2319 /*
2320  * iscsi interface functions
2321  */
2322 static struct iscsi_internal *
2323 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2324 {
2325 	struct iscsi_internal *priv;
2326 	unsigned long flags;
2327 
2328 	spin_lock_irqsave(&iscsi_transport_lock, flags);
2329 	list_for_each_entry(priv, &iscsi_transports, list) {
2330 		if (tt == priv->iscsi_transport) {
2331 			spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2332 			return priv;
2333 		}
2334 	}
2335 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2336 	return NULL;
2337 }
2338 
2339 static int
2340 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2341 {
2342 	return nlmsg_multicast(nls, skb, 0, group, gfp);
2343 }
2344 
2345 static int
2346 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2347 {
2348 	return nlmsg_unicast(nls, skb, portid);
2349 }
2350 
2351 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2352 		   char *data, uint32_t data_size)
2353 {
2354 	struct nlmsghdr	*nlh;
2355 	struct sk_buff *skb;
2356 	struct iscsi_uevent *ev;
2357 	char *pdu;
2358 	struct iscsi_internal *priv;
2359 	int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2360 				   data_size);
2361 
2362 	priv = iscsi_if_transport_lookup(conn->transport);
2363 	if (!priv)
2364 		return -EINVAL;
2365 
2366 	skb = alloc_skb(len, GFP_ATOMIC);
2367 	if (!skb) {
2368 		iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2369 		iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2370 				      "control PDU: OOM\n");
2371 		return -ENOMEM;
2372 	}
2373 
2374 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2375 	ev = nlmsg_data(nlh);
2376 	memset(ev, 0, sizeof(*ev));
2377 	ev->transport_handle = iscsi_handle(conn->transport);
2378 	ev->type = ISCSI_KEVENT_RECV_PDU;
2379 	ev->r.recv_req.cid = conn->cid;
2380 	ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2381 	pdu = (char*)ev + sizeof(*ev);
2382 	memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2383 	memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2384 
2385 	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2386 }
2387 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2388 
2389 int iscsi_offload_mesg(struct Scsi_Host *shost,
2390 		       struct iscsi_transport *transport, uint32_t type,
2391 		       char *data, uint16_t data_size)
2392 {
2393 	struct nlmsghdr	*nlh;
2394 	struct sk_buff *skb;
2395 	struct iscsi_uevent *ev;
2396 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2397 
2398 	skb = alloc_skb(len, GFP_ATOMIC);
2399 	if (!skb) {
2400 		printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2401 		return -ENOMEM;
2402 	}
2403 
2404 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2405 	ev = nlmsg_data(nlh);
2406 	memset(ev, 0, sizeof(*ev));
2407 	ev->type = type;
2408 	ev->transport_handle = iscsi_handle(transport);
2409 	switch (type) {
2410 	case ISCSI_KEVENT_PATH_REQ:
2411 		ev->r.req_path.host_no = shost->host_no;
2412 		break;
2413 	case ISCSI_KEVENT_IF_DOWN:
2414 		ev->r.notify_if_down.host_no = shost->host_no;
2415 		break;
2416 	}
2417 
2418 	memcpy((char *)ev + sizeof(*ev), data, data_size);
2419 
2420 	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2421 }
2422 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2423 
2424 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2425 {
2426 	struct nlmsghdr	*nlh;
2427 	struct sk_buff	*skb;
2428 	struct iscsi_uevent *ev;
2429 	struct iscsi_internal *priv;
2430 	int len = nlmsg_total_size(sizeof(*ev));
2431 
2432 	priv = iscsi_if_transport_lookup(conn->transport);
2433 	if (!priv)
2434 		return;
2435 
2436 	skb = alloc_skb(len, GFP_ATOMIC);
2437 	if (!skb) {
2438 		iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2439 				      "conn error (%d)\n", error);
2440 		return;
2441 	}
2442 
2443 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2444 	ev = nlmsg_data(nlh);
2445 	ev->transport_handle = iscsi_handle(conn->transport);
2446 	ev->type = ISCSI_KEVENT_CONN_ERROR;
2447 	ev->r.connerror.error = error;
2448 	ev->r.connerror.cid = conn->cid;
2449 	ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2450 
2451 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2452 
2453 	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2454 			      error);
2455 }
2456 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2457 
2458 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2459 			    enum iscsi_conn_state state)
2460 {
2461 	struct nlmsghdr *nlh;
2462 	struct sk_buff  *skb;
2463 	struct iscsi_uevent *ev;
2464 	struct iscsi_internal *priv;
2465 	int len = nlmsg_total_size(sizeof(*ev));
2466 
2467 	priv = iscsi_if_transport_lookup(conn->transport);
2468 	if (!priv)
2469 		return;
2470 
2471 	skb = alloc_skb(len, GFP_ATOMIC);
2472 	if (!skb) {
2473 		iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2474 				      "conn login (%d)\n", state);
2475 		return;
2476 	}
2477 
2478 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2479 	ev = nlmsg_data(nlh);
2480 	ev->transport_handle = iscsi_handle(conn->transport);
2481 	ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2482 	ev->r.conn_login.state = state;
2483 	ev->r.conn_login.cid = conn->cid;
2484 	ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2485 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2486 
2487 	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2488 			      state);
2489 }
2490 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2491 
2492 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2493 			   enum iscsi_host_event_code code, uint32_t data_size,
2494 			   uint8_t *data)
2495 {
2496 	struct nlmsghdr *nlh;
2497 	struct sk_buff *skb;
2498 	struct iscsi_uevent *ev;
2499 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2500 
2501 	skb = alloc_skb(len, GFP_NOIO);
2502 	if (!skb) {
2503 		printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2504 		       host_no, code);
2505 		return;
2506 	}
2507 
2508 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2509 	ev = nlmsg_data(nlh);
2510 	ev->transport_handle = iscsi_handle(transport);
2511 	ev->type = ISCSI_KEVENT_HOST_EVENT;
2512 	ev->r.host_event.host_no = host_no;
2513 	ev->r.host_event.code = code;
2514 	ev->r.host_event.data_size = data_size;
2515 
2516 	if (data_size)
2517 		memcpy((char *)ev + sizeof(*ev), data, data_size);
2518 
2519 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2520 }
2521 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2522 
2523 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2524 			   uint32_t status, uint32_t pid, uint32_t data_size,
2525 			   uint8_t *data)
2526 {
2527 	struct nlmsghdr *nlh;
2528 	struct sk_buff *skb;
2529 	struct iscsi_uevent *ev;
2530 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2531 
2532 	skb = alloc_skb(len, GFP_NOIO);
2533 	if (!skb) {
2534 		printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2535 		return;
2536 	}
2537 
2538 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2539 	ev = nlmsg_data(nlh);
2540 	ev->transport_handle = iscsi_handle(transport);
2541 	ev->type = ISCSI_KEVENT_PING_COMP;
2542 	ev->r.ping_comp.host_no = host_no;
2543 	ev->r.ping_comp.status = status;
2544 	ev->r.ping_comp.pid = pid;
2545 	ev->r.ping_comp.data_size = data_size;
2546 	memcpy((char *)ev + sizeof(*ev), data, data_size);
2547 
2548 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2549 }
2550 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2551 
2552 static int
2553 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2554 {
2555 	struct sk_buff	*skb;
2556 	struct nlmsghdr	*nlh;
2557 	int len = nlmsg_total_size(size);
2558 
2559 	skb = alloc_skb(len, GFP_ATOMIC);
2560 	if (!skb) {
2561 		printk(KERN_ERR "Could not allocate skb to send reply.\n");
2562 		return -ENOMEM;
2563 	}
2564 
2565 	nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2566 	memcpy(nlmsg_data(nlh), payload, size);
2567 	return iscsi_unicast_skb(skb, portid);
2568 }
2569 
2570 static int
2571 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2572 {
2573 	struct iscsi_uevent *ev = nlmsg_data(nlh);
2574 	struct iscsi_stats *stats;
2575 	struct sk_buff *skbstat;
2576 	struct iscsi_cls_conn *conn;
2577 	struct nlmsghdr	*nlhstat;
2578 	struct iscsi_uevent *evstat;
2579 	struct iscsi_internal *priv;
2580 	int len = nlmsg_total_size(sizeof(*ev) +
2581 				   sizeof(struct iscsi_stats) +
2582 				   sizeof(struct iscsi_stats_custom) *
2583 				   ISCSI_STATS_CUSTOM_MAX);
2584 	int err = 0;
2585 
2586 	priv = iscsi_if_transport_lookup(transport);
2587 	if (!priv)
2588 		return -EINVAL;
2589 
2590 	conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2591 	if (!conn)
2592 		return -EEXIST;
2593 
2594 	do {
2595 		int actual_size;
2596 
2597 		skbstat = alloc_skb(len, GFP_ATOMIC);
2598 		if (!skbstat) {
2599 			iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2600 					      "deliver stats: OOM\n");
2601 			return -ENOMEM;
2602 		}
2603 
2604 		nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2605 				      (len - sizeof(*nlhstat)), 0);
2606 		evstat = nlmsg_data(nlhstat);
2607 		memset(evstat, 0, sizeof(*evstat));
2608 		evstat->transport_handle = iscsi_handle(conn->transport);
2609 		evstat->type = nlh->nlmsg_type;
2610 		evstat->u.get_stats.cid =
2611 			ev->u.get_stats.cid;
2612 		evstat->u.get_stats.sid =
2613 			ev->u.get_stats.sid;
2614 		stats = (struct iscsi_stats *)
2615 			((char*)evstat + sizeof(*evstat));
2616 		memset(stats, 0, sizeof(*stats));
2617 
2618 		transport->get_stats(conn, stats);
2619 		actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2620 					       sizeof(struct iscsi_stats) +
2621 					       sizeof(struct iscsi_stats_custom) *
2622 					       stats->custom_length);
2623 		actual_size -= sizeof(*nlhstat);
2624 		actual_size = nlmsg_msg_size(actual_size);
2625 		skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2626 		nlhstat->nlmsg_len = actual_size;
2627 
2628 		err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2629 					  GFP_ATOMIC);
2630 	} while (err < 0 && err != -ECONNREFUSED);
2631 
2632 	return err;
2633 }
2634 
2635 /**
2636  * iscsi_session_event - send session destr. completion event
2637  * @session: iscsi class session
2638  * @event: type of event
2639  */
2640 int iscsi_session_event(struct iscsi_cls_session *session,
2641 			enum iscsi_uevent_e event)
2642 {
2643 	struct iscsi_internal *priv;
2644 	struct Scsi_Host *shost;
2645 	struct iscsi_uevent *ev;
2646 	struct sk_buff  *skb;
2647 	struct nlmsghdr *nlh;
2648 	int rc, len = nlmsg_total_size(sizeof(*ev));
2649 
2650 	priv = iscsi_if_transport_lookup(session->transport);
2651 	if (!priv)
2652 		return -EINVAL;
2653 	shost = iscsi_session_to_shost(session);
2654 
2655 	skb = alloc_skb(len, GFP_KERNEL);
2656 	if (!skb) {
2657 		iscsi_cls_session_printk(KERN_ERR, session,
2658 					 "Cannot notify userspace of session "
2659 					 "event %u\n", event);
2660 		return -ENOMEM;
2661 	}
2662 
2663 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2664 	ev = nlmsg_data(nlh);
2665 	ev->transport_handle = iscsi_handle(session->transport);
2666 
2667 	ev->type = event;
2668 	switch (event) {
2669 	case ISCSI_KEVENT_DESTROY_SESSION:
2670 		ev->r.d_session.host_no = shost->host_no;
2671 		ev->r.d_session.sid = session->sid;
2672 		break;
2673 	case ISCSI_KEVENT_CREATE_SESSION:
2674 		ev->r.c_session_ret.host_no = shost->host_no;
2675 		ev->r.c_session_ret.sid = session->sid;
2676 		break;
2677 	case ISCSI_KEVENT_UNBIND_SESSION:
2678 		ev->r.unbind_session.host_no = shost->host_no;
2679 		ev->r.unbind_session.sid = session->sid;
2680 		break;
2681 	default:
2682 		iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2683 					 "%u.\n", event);
2684 		kfree_skb(skb);
2685 		return -EINVAL;
2686 	}
2687 
2688 	/*
2689 	 * this will occur if the daemon is not up, so we just warn
2690 	 * the user and when the daemon is restarted it will handle it
2691 	 */
2692 	rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2693 	if (rc == -ESRCH)
2694 		iscsi_cls_session_printk(KERN_ERR, session,
2695 					 "Cannot notify userspace of session "
2696 					 "event %u. Check iscsi daemon\n",
2697 					 event);
2698 
2699 	ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2700 				event, rc);
2701 	return rc;
2702 }
2703 EXPORT_SYMBOL_GPL(iscsi_session_event);
2704 
2705 static int
2706 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2707 			struct iscsi_uevent *ev, pid_t pid,
2708 			uint32_t initial_cmdsn,	uint16_t cmds_max,
2709 			uint16_t queue_depth)
2710 {
2711 	struct iscsi_transport *transport = priv->iscsi_transport;
2712 	struct iscsi_cls_session *session;
2713 	struct Scsi_Host *shost;
2714 
2715 	session = transport->create_session(ep, cmds_max, queue_depth,
2716 					    initial_cmdsn);
2717 	if (!session)
2718 		return -ENOMEM;
2719 
2720 	session->creator = pid;
2721 	shost = iscsi_session_to_shost(session);
2722 	ev->r.c_session_ret.host_no = shost->host_no;
2723 	ev->r.c_session_ret.sid = session->sid;
2724 	ISCSI_DBG_TRANS_SESSION(session,
2725 				"Completed creating transport session\n");
2726 	return 0;
2727 }
2728 
2729 static int
2730 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2731 {
2732 	struct iscsi_cls_conn *conn;
2733 	struct iscsi_cls_session *session;
2734 
2735 	session = iscsi_session_lookup(ev->u.c_conn.sid);
2736 	if (!session) {
2737 		printk(KERN_ERR "iscsi: invalid session %d.\n",
2738 		       ev->u.c_conn.sid);
2739 		return -EINVAL;
2740 	}
2741 
2742 	conn = transport->create_conn(session, ev->u.c_conn.cid);
2743 	if (!conn) {
2744 		iscsi_cls_session_printk(KERN_ERR, session,
2745 					 "couldn't create a new connection.");
2746 		return -ENOMEM;
2747 	}
2748 
2749 	ev->r.c_conn_ret.sid = session->sid;
2750 	ev->r.c_conn_ret.cid = conn->cid;
2751 
2752 	ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2753 	return 0;
2754 }
2755 
2756 static int
2757 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2758 {
2759 	struct iscsi_cls_conn *conn;
2760 
2761 	conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2762 	if (!conn)
2763 		return -EINVAL;
2764 
2765 	ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2766 	if (transport->destroy_conn)
2767 		transport->destroy_conn(conn);
2768 
2769 	return 0;
2770 }
2771 
2772 static int
2773 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2774 {
2775 	char *data = (char*)ev + sizeof(*ev);
2776 	struct iscsi_cls_conn *conn;
2777 	struct iscsi_cls_session *session;
2778 	int err = 0, value = 0;
2779 
2780 	session = iscsi_session_lookup(ev->u.set_param.sid);
2781 	conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2782 	if (!conn || !session)
2783 		return -EINVAL;
2784 
2785 	switch (ev->u.set_param.param) {
2786 	case ISCSI_PARAM_SESS_RECOVERY_TMO:
2787 		sscanf(data, "%d", &value);
2788 		if (!session->recovery_tmo_sysfs_override)
2789 			session->recovery_tmo = value;
2790 		break;
2791 	default:
2792 		err = transport->set_param(conn, ev->u.set_param.param,
2793 					   data, ev->u.set_param.len);
2794 	}
2795 
2796 	return err;
2797 }
2798 
2799 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2800 			       struct iscsi_uevent *ev, int msg_type)
2801 {
2802 	struct iscsi_endpoint *ep;
2803 	struct sockaddr *dst_addr;
2804 	struct Scsi_Host *shost = NULL;
2805 	int non_blocking, err = 0;
2806 
2807 	if (!transport->ep_connect)
2808 		return -EINVAL;
2809 
2810 	if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2811 		shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2812 		if (!shost) {
2813 			printk(KERN_ERR "ep connect failed. Could not find "
2814 			       "host no %u\n",
2815 			       ev->u.ep_connect_through_host.host_no);
2816 			return -ENODEV;
2817 		}
2818 		non_blocking = ev->u.ep_connect_through_host.non_blocking;
2819 	} else
2820 		non_blocking = ev->u.ep_connect.non_blocking;
2821 
2822 	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2823 	ep = transport->ep_connect(shost, dst_addr, non_blocking);
2824 	if (IS_ERR(ep)) {
2825 		err = PTR_ERR(ep);
2826 		goto release_host;
2827 	}
2828 
2829 	ev->r.ep_connect_ret.handle = ep->id;
2830 release_host:
2831 	if (shost)
2832 		scsi_host_put(shost);
2833 	return err;
2834 }
2835 
2836 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2837 				  u64 ep_handle)
2838 {
2839 	struct iscsi_cls_conn *conn;
2840 	struct iscsi_endpoint *ep;
2841 
2842 	if (!transport->ep_disconnect)
2843 		return -EINVAL;
2844 
2845 	ep = iscsi_lookup_endpoint(ep_handle);
2846 	if (!ep)
2847 		return -EINVAL;
2848 	conn = ep->conn;
2849 	if (conn) {
2850 		mutex_lock(&conn->ep_mutex);
2851 		conn->ep = NULL;
2852 		mutex_unlock(&conn->ep_mutex);
2853 	}
2854 
2855 	transport->ep_disconnect(ep);
2856 	return 0;
2857 }
2858 
2859 static int
2860 iscsi_if_transport_ep(struct iscsi_transport *transport,
2861 		      struct iscsi_uevent *ev, int msg_type)
2862 {
2863 	struct iscsi_endpoint *ep;
2864 	int rc = 0;
2865 
2866 	switch (msg_type) {
2867 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2868 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2869 		rc = iscsi_if_ep_connect(transport, ev, msg_type);
2870 		break;
2871 	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2872 		if (!transport->ep_poll)
2873 			return -EINVAL;
2874 
2875 		ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2876 		if (!ep)
2877 			return -EINVAL;
2878 
2879 		ev->r.retcode = transport->ep_poll(ep,
2880 						   ev->u.ep_poll.timeout_ms);
2881 		break;
2882 	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2883 		rc = iscsi_if_ep_disconnect(transport,
2884 					    ev->u.ep_disconnect.ep_handle);
2885 		break;
2886 	}
2887 	return rc;
2888 }
2889 
2890 static int
2891 iscsi_tgt_dscvr(struct iscsi_transport *transport,
2892 		struct iscsi_uevent *ev)
2893 {
2894 	struct Scsi_Host *shost;
2895 	struct sockaddr *dst_addr;
2896 	int err;
2897 
2898 	if (!transport->tgt_dscvr)
2899 		return -EINVAL;
2900 
2901 	shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
2902 	if (!shost) {
2903 		printk(KERN_ERR "target discovery could not find host no %u\n",
2904 		       ev->u.tgt_dscvr.host_no);
2905 		return -ENODEV;
2906 	}
2907 
2908 
2909 	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2910 	err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
2911 				   ev->u.tgt_dscvr.enable, dst_addr);
2912 	scsi_host_put(shost);
2913 	return err;
2914 }
2915 
2916 static int
2917 iscsi_set_host_param(struct iscsi_transport *transport,
2918 		     struct iscsi_uevent *ev)
2919 {
2920 	char *data = (char*)ev + sizeof(*ev);
2921 	struct Scsi_Host *shost;
2922 	int err;
2923 
2924 	if (!transport->set_host_param)
2925 		return -ENOSYS;
2926 
2927 	shost = scsi_host_lookup(ev->u.set_host_param.host_no);
2928 	if (!shost) {
2929 		printk(KERN_ERR "set_host_param could not find host no %u\n",
2930 		       ev->u.set_host_param.host_no);
2931 		return -ENODEV;
2932 	}
2933 
2934 	err = transport->set_host_param(shost, ev->u.set_host_param.param,
2935 					data, ev->u.set_host_param.len);
2936 	scsi_host_put(shost);
2937 	return err;
2938 }
2939 
2940 static int
2941 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2942 {
2943 	struct Scsi_Host *shost;
2944 	struct iscsi_path *params;
2945 	int err;
2946 
2947 	if (!transport->set_path)
2948 		return -ENOSYS;
2949 
2950 	shost = scsi_host_lookup(ev->u.set_path.host_no);
2951 	if (!shost) {
2952 		printk(KERN_ERR "set path could not find host no %u\n",
2953 		       ev->u.set_path.host_no);
2954 		return -ENODEV;
2955 	}
2956 
2957 	params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
2958 	err = transport->set_path(shost, params);
2959 
2960 	scsi_host_put(shost);
2961 	return err;
2962 }
2963 
2964 static int iscsi_session_has_conns(int sid)
2965 {
2966 	struct iscsi_cls_conn *conn;
2967 	unsigned long flags;
2968 	int found = 0;
2969 
2970 	spin_lock_irqsave(&connlock, flags);
2971 	list_for_each_entry(conn, &connlist, conn_list) {
2972 		if (iscsi_conn_get_sid(conn) == sid) {
2973 			found = 1;
2974 			break;
2975 		}
2976 	}
2977 	spin_unlock_irqrestore(&connlock, flags);
2978 
2979 	return found;
2980 }
2981 
2982 static int
2983 iscsi_set_iface_params(struct iscsi_transport *transport,
2984 		       struct iscsi_uevent *ev, uint32_t len)
2985 {
2986 	char *data = (char *)ev + sizeof(*ev);
2987 	struct Scsi_Host *shost;
2988 	int err;
2989 
2990 	if (!transport->set_iface_param)
2991 		return -ENOSYS;
2992 
2993 	shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
2994 	if (!shost) {
2995 		printk(KERN_ERR "set_iface_params could not find host no %u\n",
2996 		       ev->u.set_iface_params.host_no);
2997 		return -ENODEV;
2998 	}
2999 
3000 	err = transport->set_iface_param(shost, data, len);
3001 	scsi_host_put(shost);
3002 	return err;
3003 }
3004 
3005 static int
3006 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3007 {
3008 	struct Scsi_Host *shost;
3009 	struct sockaddr *dst_addr;
3010 	int err;
3011 
3012 	if (!transport->send_ping)
3013 		return -ENOSYS;
3014 
3015 	shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3016 	if (!shost) {
3017 		printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3018 		       ev->u.iscsi_ping.host_no);
3019 		return -ENODEV;
3020 	}
3021 
3022 	dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3023 	err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3024 				   ev->u.iscsi_ping.iface_type,
3025 				   ev->u.iscsi_ping.payload_size,
3026 				   ev->u.iscsi_ping.pid,
3027 				   dst_addr);
3028 	scsi_host_put(shost);
3029 	return err;
3030 }
3031 
3032 static int
3033 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3034 {
3035 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3036 	struct Scsi_Host *shost = NULL;
3037 	struct iscsi_chap_rec *chap_rec;
3038 	struct iscsi_internal *priv;
3039 	struct sk_buff *skbchap;
3040 	struct nlmsghdr *nlhchap;
3041 	struct iscsi_uevent *evchap;
3042 	uint32_t chap_buf_size;
3043 	int len, err = 0;
3044 	char *buf;
3045 
3046 	if (!transport->get_chap)
3047 		return -EINVAL;
3048 
3049 	priv = iscsi_if_transport_lookup(transport);
3050 	if (!priv)
3051 		return -EINVAL;
3052 
3053 	chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3054 	len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3055 
3056 	shost = scsi_host_lookup(ev->u.get_chap.host_no);
3057 	if (!shost) {
3058 		printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3059 		       __func__, ev->u.get_chap.host_no);
3060 		return -ENODEV;
3061 	}
3062 
3063 	do {
3064 		int actual_size;
3065 
3066 		skbchap = alloc_skb(len, GFP_KERNEL);
3067 		if (!skbchap) {
3068 			printk(KERN_ERR "can not deliver chap: OOM\n");
3069 			err = -ENOMEM;
3070 			goto exit_get_chap;
3071 		}
3072 
3073 		nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3074 				      (len - sizeof(*nlhchap)), 0);
3075 		evchap = nlmsg_data(nlhchap);
3076 		memset(evchap, 0, sizeof(*evchap));
3077 		evchap->transport_handle = iscsi_handle(transport);
3078 		evchap->type = nlh->nlmsg_type;
3079 		evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3080 		evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3081 		evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3082 		buf = (char *)evchap + sizeof(*evchap);
3083 		memset(buf, 0, chap_buf_size);
3084 
3085 		err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3086 				    &evchap->u.get_chap.num_entries, buf);
3087 
3088 		actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3089 		skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3090 		nlhchap->nlmsg_len = actual_size;
3091 
3092 		err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3093 					  GFP_KERNEL);
3094 	} while (err < 0 && err != -ECONNREFUSED);
3095 
3096 exit_get_chap:
3097 	scsi_host_put(shost);
3098 	return err;
3099 }
3100 
3101 static int iscsi_set_chap(struct iscsi_transport *transport,
3102 			  struct iscsi_uevent *ev, uint32_t len)
3103 {
3104 	char *data = (char *)ev + sizeof(*ev);
3105 	struct Scsi_Host *shost;
3106 	int err = 0;
3107 
3108 	if (!transport->set_chap)
3109 		return -ENOSYS;
3110 
3111 	shost = scsi_host_lookup(ev->u.set_path.host_no);
3112 	if (!shost) {
3113 		pr_err("%s could not find host no %u\n",
3114 		       __func__, ev->u.set_path.host_no);
3115 		return -ENODEV;
3116 	}
3117 
3118 	err = transport->set_chap(shost, data, len);
3119 	scsi_host_put(shost);
3120 	return err;
3121 }
3122 
3123 static int iscsi_delete_chap(struct iscsi_transport *transport,
3124 			     struct iscsi_uevent *ev)
3125 {
3126 	struct Scsi_Host *shost;
3127 	int err = 0;
3128 
3129 	if (!transport->delete_chap)
3130 		return -ENOSYS;
3131 
3132 	shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3133 	if (!shost) {
3134 		printk(KERN_ERR "%s could not find host no %u\n",
3135 		       __func__, ev->u.delete_chap.host_no);
3136 		return -ENODEV;
3137 	}
3138 
3139 	err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3140 	scsi_host_put(shost);
3141 	return err;
3142 }
3143 
3144 static const struct {
3145 	enum iscsi_discovery_parent_type value;
3146 	char				*name;
3147 } iscsi_discovery_parent_names[] = {
3148 	{ISCSI_DISC_PARENT_UNKNOWN,	"Unknown" },
3149 	{ISCSI_DISC_PARENT_SENDTGT,	"Sendtarget" },
3150 	{ISCSI_DISC_PARENT_ISNS,	"isns" },
3151 };
3152 
3153 char *iscsi_get_discovery_parent_name(int parent_type)
3154 {
3155 	int i;
3156 	char *state = "Unknown!";
3157 
3158 	for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3159 		if (iscsi_discovery_parent_names[i].value & parent_type) {
3160 			state = iscsi_discovery_parent_names[i].name;
3161 			break;
3162 		}
3163 	}
3164 	return state;
3165 }
3166 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3167 
3168 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3169 				     struct iscsi_uevent *ev, uint32_t len)
3170 {
3171 	char *data = (char *)ev + sizeof(*ev);
3172 	struct Scsi_Host *shost;
3173 	struct iscsi_bus_flash_session *fnode_sess;
3174 	struct iscsi_bus_flash_conn *fnode_conn;
3175 	struct device *dev;
3176 	uint32_t idx;
3177 	int err = 0;
3178 
3179 	if (!transport->set_flashnode_param) {
3180 		err = -ENOSYS;
3181 		goto exit_set_fnode;
3182 	}
3183 
3184 	shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3185 	if (!shost) {
3186 		pr_err("%s could not find host no %u\n",
3187 		       __func__, ev->u.set_flashnode.host_no);
3188 		err = -ENODEV;
3189 		goto put_host;
3190 	}
3191 
3192 	idx = ev->u.set_flashnode.flashnode_idx;
3193 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3194 	if (!fnode_sess) {
3195 		pr_err("%s could not find flashnode %u for host no %u\n",
3196 		       __func__, idx, ev->u.set_flashnode.host_no);
3197 		err = -ENODEV;
3198 		goto put_host;
3199 	}
3200 
3201 	dev = iscsi_find_flashnode_conn(fnode_sess);
3202 	if (!dev) {
3203 		err = -ENODEV;
3204 		goto put_sess;
3205 	}
3206 
3207 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3208 	err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3209 	put_device(dev);
3210 
3211 put_sess:
3212 	put_device(&fnode_sess->dev);
3213 
3214 put_host:
3215 	scsi_host_put(shost);
3216 
3217 exit_set_fnode:
3218 	return err;
3219 }
3220 
3221 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3222 			       struct iscsi_uevent *ev, uint32_t len)
3223 {
3224 	char *data = (char *)ev + sizeof(*ev);
3225 	struct Scsi_Host *shost;
3226 	int index;
3227 	int err = 0;
3228 
3229 	if (!transport->new_flashnode) {
3230 		err = -ENOSYS;
3231 		goto exit_new_fnode;
3232 	}
3233 
3234 	shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3235 	if (!shost) {
3236 		pr_err("%s could not find host no %u\n",
3237 		       __func__, ev->u.new_flashnode.host_no);
3238 		err = -ENODEV;
3239 		goto put_host;
3240 	}
3241 
3242 	index = transport->new_flashnode(shost, data, len);
3243 
3244 	if (index >= 0)
3245 		ev->r.new_flashnode_ret.flashnode_idx = index;
3246 	else
3247 		err = -EIO;
3248 
3249 put_host:
3250 	scsi_host_put(shost);
3251 
3252 exit_new_fnode:
3253 	return err;
3254 }
3255 
3256 static int iscsi_del_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 	uint32_t idx;
3262 	int err = 0;
3263 
3264 	if (!transport->del_flashnode) {
3265 		err = -ENOSYS;
3266 		goto exit_del_fnode;
3267 	}
3268 
3269 	shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3270 	if (!shost) {
3271 		pr_err("%s could not find host no %u\n",
3272 		       __func__, ev->u.del_flashnode.host_no);
3273 		err = -ENODEV;
3274 		goto put_host;
3275 	}
3276 
3277 	idx = ev->u.del_flashnode.flashnode_idx;
3278 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3279 	if (!fnode_sess) {
3280 		pr_err("%s could not find flashnode %u for host no %u\n",
3281 		       __func__, idx, ev->u.del_flashnode.host_no);
3282 		err = -ENODEV;
3283 		goto put_host;
3284 	}
3285 
3286 	err = transport->del_flashnode(fnode_sess);
3287 	put_device(&fnode_sess->dev);
3288 
3289 put_host:
3290 	scsi_host_put(shost);
3291 
3292 exit_del_fnode:
3293 	return err;
3294 }
3295 
3296 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3297 				 struct iscsi_uevent *ev)
3298 {
3299 	struct Scsi_Host *shost;
3300 	struct iscsi_bus_flash_session *fnode_sess;
3301 	struct iscsi_bus_flash_conn *fnode_conn;
3302 	struct device *dev;
3303 	uint32_t idx;
3304 	int err = 0;
3305 
3306 	if (!transport->login_flashnode) {
3307 		err = -ENOSYS;
3308 		goto exit_login_fnode;
3309 	}
3310 
3311 	shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3312 	if (!shost) {
3313 		pr_err("%s could not find host no %u\n",
3314 		       __func__, ev->u.login_flashnode.host_no);
3315 		err = -ENODEV;
3316 		goto put_host;
3317 	}
3318 
3319 	idx = ev->u.login_flashnode.flashnode_idx;
3320 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3321 	if (!fnode_sess) {
3322 		pr_err("%s could not find flashnode %u for host no %u\n",
3323 		       __func__, idx, ev->u.login_flashnode.host_no);
3324 		err = -ENODEV;
3325 		goto put_host;
3326 	}
3327 
3328 	dev = iscsi_find_flashnode_conn(fnode_sess);
3329 	if (!dev) {
3330 		err = -ENODEV;
3331 		goto put_sess;
3332 	}
3333 
3334 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3335 	err = transport->login_flashnode(fnode_sess, fnode_conn);
3336 	put_device(dev);
3337 
3338 put_sess:
3339 	put_device(&fnode_sess->dev);
3340 
3341 put_host:
3342 	scsi_host_put(shost);
3343 
3344 exit_login_fnode:
3345 	return err;
3346 }
3347 
3348 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3349 				  struct iscsi_uevent *ev)
3350 {
3351 	struct Scsi_Host *shost;
3352 	struct iscsi_bus_flash_session *fnode_sess;
3353 	struct iscsi_bus_flash_conn *fnode_conn;
3354 	struct device *dev;
3355 	uint32_t idx;
3356 	int err = 0;
3357 
3358 	if (!transport->logout_flashnode) {
3359 		err = -ENOSYS;
3360 		goto exit_logout_fnode;
3361 	}
3362 
3363 	shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3364 	if (!shost) {
3365 		pr_err("%s could not find host no %u\n",
3366 		       __func__, ev->u.logout_flashnode.host_no);
3367 		err = -ENODEV;
3368 		goto put_host;
3369 	}
3370 
3371 	idx = ev->u.logout_flashnode.flashnode_idx;
3372 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3373 	if (!fnode_sess) {
3374 		pr_err("%s could not find flashnode %u for host no %u\n",
3375 		       __func__, idx, ev->u.logout_flashnode.host_no);
3376 		err = -ENODEV;
3377 		goto put_host;
3378 	}
3379 
3380 	dev = iscsi_find_flashnode_conn(fnode_sess);
3381 	if (!dev) {
3382 		err = -ENODEV;
3383 		goto put_sess;
3384 	}
3385 
3386 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3387 
3388 	err = transport->logout_flashnode(fnode_sess, fnode_conn);
3389 	put_device(dev);
3390 
3391 put_sess:
3392 	put_device(&fnode_sess->dev);
3393 
3394 put_host:
3395 	scsi_host_put(shost);
3396 
3397 exit_logout_fnode:
3398 	return err;
3399 }
3400 
3401 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3402 				      struct iscsi_uevent *ev)
3403 {
3404 	struct Scsi_Host *shost;
3405 	struct iscsi_cls_session *session;
3406 	int err = 0;
3407 
3408 	if (!transport->logout_flashnode_sid) {
3409 		err = -ENOSYS;
3410 		goto exit_logout_sid;
3411 	}
3412 
3413 	shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3414 	if (!shost) {
3415 		pr_err("%s could not find host no %u\n",
3416 		       __func__, ev->u.logout_flashnode.host_no);
3417 		err = -ENODEV;
3418 		goto put_host;
3419 	}
3420 
3421 	session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3422 	if (!session) {
3423 		pr_err("%s could not find session id %u\n",
3424 		       __func__, ev->u.logout_flashnode_sid.sid);
3425 		err = -EINVAL;
3426 		goto put_host;
3427 	}
3428 
3429 	err = transport->logout_flashnode_sid(session);
3430 
3431 put_host:
3432 	scsi_host_put(shost);
3433 
3434 exit_logout_sid:
3435 	return err;
3436 }
3437 
3438 static int
3439 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3440 {
3441 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3442 	struct Scsi_Host *shost = NULL;
3443 	struct iscsi_internal *priv;
3444 	struct sk_buff *skbhost_stats;
3445 	struct nlmsghdr *nlhhost_stats;
3446 	struct iscsi_uevent *evhost_stats;
3447 	int host_stats_size = 0;
3448 	int len, err = 0;
3449 	char *buf;
3450 
3451 	if (!transport->get_host_stats)
3452 		return -ENOSYS;
3453 
3454 	priv = iscsi_if_transport_lookup(transport);
3455 	if (!priv)
3456 		return -EINVAL;
3457 
3458 	host_stats_size = sizeof(struct iscsi_offload_host_stats);
3459 	len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3460 
3461 	shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3462 	if (!shost) {
3463 		pr_err("%s: failed. Could not find host no %u\n",
3464 		       __func__, ev->u.get_host_stats.host_no);
3465 		return -ENODEV;
3466 	}
3467 
3468 	do {
3469 		int actual_size;
3470 
3471 		skbhost_stats = alloc_skb(len, GFP_KERNEL);
3472 		if (!skbhost_stats) {
3473 			pr_err("cannot deliver host stats: OOM\n");
3474 			err = -ENOMEM;
3475 			goto exit_host_stats;
3476 		}
3477 
3478 		nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3479 				      (len - sizeof(*nlhhost_stats)), 0);
3480 		evhost_stats = nlmsg_data(nlhhost_stats);
3481 		memset(evhost_stats, 0, sizeof(*evhost_stats));
3482 		evhost_stats->transport_handle = iscsi_handle(transport);
3483 		evhost_stats->type = nlh->nlmsg_type;
3484 		evhost_stats->u.get_host_stats.host_no =
3485 					ev->u.get_host_stats.host_no;
3486 		buf = (char *)evhost_stats + sizeof(*evhost_stats);
3487 		memset(buf, 0, host_stats_size);
3488 
3489 		err = transport->get_host_stats(shost, buf, host_stats_size);
3490 		if (err) {
3491 			kfree_skb(skbhost_stats);
3492 			goto exit_host_stats;
3493 		}
3494 
3495 		actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3496 		skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3497 		nlhhost_stats->nlmsg_len = actual_size;
3498 
3499 		err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3500 					  GFP_KERNEL);
3501 	} while (err < 0 && err != -ECONNREFUSED);
3502 
3503 exit_host_stats:
3504 	scsi_host_put(shost);
3505 	return err;
3506 }
3507 
3508 
3509 static int
3510 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3511 {
3512 	int err = 0;
3513 	u32 portid;
3514 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3515 	struct iscsi_transport *transport = NULL;
3516 	struct iscsi_internal *priv;
3517 	struct iscsi_cls_session *session;
3518 	struct iscsi_cls_conn *conn;
3519 	struct iscsi_endpoint *ep = NULL;
3520 
3521 	if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3522 		*group = ISCSI_NL_GRP_UIP;
3523 	else
3524 		*group = ISCSI_NL_GRP_ISCSID;
3525 
3526 	priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3527 	if (!priv)
3528 		return -EINVAL;
3529 	transport = priv->iscsi_transport;
3530 
3531 	if (!try_module_get(transport->owner))
3532 		return -EINVAL;
3533 
3534 	portid = NETLINK_CB(skb).portid;
3535 
3536 	switch (nlh->nlmsg_type) {
3537 	case ISCSI_UEVENT_CREATE_SESSION:
3538 		err = iscsi_if_create_session(priv, ep, ev,
3539 					      portid,
3540 					      ev->u.c_session.initial_cmdsn,
3541 					      ev->u.c_session.cmds_max,
3542 					      ev->u.c_session.queue_depth);
3543 		break;
3544 	case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3545 		ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3546 		if (!ep) {
3547 			err = -EINVAL;
3548 			break;
3549 		}
3550 
3551 		err = iscsi_if_create_session(priv, ep, ev,
3552 					portid,
3553 					ev->u.c_bound_session.initial_cmdsn,
3554 					ev->u.c_bound_session.cmds_max,
3555 					ev->u.c_bound_session.queue_depth);
3556 		break;
3557 	case ISCSI_UEVENT_DESTROY_SESSION:
3558 		session = iscsi_session_lookup(ev->u.d_session.sid);
3559 		if (!session)
3560 			err = -EINVAL;
3561 		else if (iscsi_session_has_conns(ev->u.d_session.sid))
3562 			err = -EBUSY;
3563 		else
3564 			transport->destroy_session(session);
3565 		break;
3566 	case ISCSI_UEVENT_UNBIND_SESSION:
3567 		session = iscsi_session_lookup(ev->u.d_session.sid);
3568 		if (session)
3569 			scsi_queue_work(iscsi_session_to_shost(session),
3570 					&session->unbind_work);
3571 		else
3572 			err = -EINVAL;
3573 		break;
3574 	case ISCSI_UEVENT_CREATE_CONN:
3575 		err = iscsi_if_create_conn(transport, ev);
3576 		break;
3577 	case ISCSI_UEVENT_DESTROY_CONN:
3578 		err = iscsi_if_destroy_conn(transport, ev);
3579 		break;
3580 	case ISCSI_UEVENT_BIND_CONN:
3581 		session = iscsi_session_lookup(ev->u.b_conn.sid);
3582 		conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3583 
3584 		if (conn && conn->ep)
3585 			iscsi_if_ep_disconnect(transport, conn->ep->id);
3586 
3587 		if (!session || !conn) {
3588 			err = -EINVAL;
3589 			break;
3590 		}
3591 
3592 		ev->r.retcode =	transport->bind_conn(session, conn,
3593 						ev->u.b_conn.transport_eph,
3594 						ev->u.b_conn.is_leading);
3595 		if (ev->r.retcode || !transport->ep_connect)
3596 			break;
3597 
3598 		ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3599 		if (ep) {
3600 			ep->conn = conn;
3601 
3602 			mutex_lock(&conn->ep_mutex);
3603 			conn->ep = ep;
3604 			mutex_unlock(&conn->ep_mutex);
3605 		} else
3606 			iscsi_cls_conn_printk(KERN_ERR, conn,
3607 					      "Could not set ep conn "
3608 					      "binding\n");
3609 		break;
3610 	case ISCSI_UEVENT_SET_PARAM:
3611 		err = iscsi_set_param(transport, ev);
3612 		break;
3613 	case ISCSI_UEVENT_START_CONN:
3614 		conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3615 		if (conn)
3616 			ev->r.retcode = transport->start_conn(conn);
3617 		else
3618 			err = -EINVAL;
3619 		break;
3620 	case ISCSI_UEVENT_STOP_CONN:
3621 		conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3622 		if (conn)
3623 			transport->stop_conn(conn, ev->u.stop_conn.flag);
3624 		else
3625 			err = -EINVAL;
3626 		break;
3627 	case ISCSI_UEVENT_SEND_PDU:
3628 		conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3629 		if (conn)
3630 			ev->r.retcode =	transport->send_pdu(conn,
3631 				(struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3632 				(char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3633 				ev->u.send_pdu.data_size);
3634 		else
3635 			err = -EINVAL;
3636 		break;
3637 	case ISCSI_UEVENT_GET_STATS:
3638 		err = iscsi_if_get_stats(transport, nlh);
3639 		break;
3640 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3641 	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3642 	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3643 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3644 		err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3645 		break;
3646 	case ISCSI_UEVENT_TGT_DSCVR:
3647 		err = iscsi_tgt_dscvr(transport, ev);
3648 		break;
3649 	case ISCSI_UEVENT_SET_HOST_PARAM:
3650 		err = iscsi_set_host_param(transport, ev);
3651 		break;
3652 	case ISCSI_UEVENT_PATH_UPDATE:
3653 		err = iscsi_set_path(transport, ev);
3654 		break;
3655 	case ISCSI_UEVENT_SET_IFACE_PARAMS:
3656 		err = iscsi_set_iface_params(transport, ev,
3657 					     nlmsg_attrlen(nlh, sizeof(*ev)));
3658 		break;
3659 	case ISCSI_UEVENT_PING:
3660 		err = iscsi_send_ping(transport, ev);
3661 		break;
3662 	case ISCSI_UEVENT_GET_CHAP:
3663 		err = iscsi_get_chap(transport, nlh);
3664 		break;
3665 	case ISCSI_UEVENT_DELETE_CHAP:
3666 		err = iscsi_delete_chap(transport, ev);
3667 		break;
3668 	case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3669 		err = iscsi_set_flashnode_param(transport, ev,
3670 						nlmsg_attrlen(nlh,
3671 							      sizeof(*ev)));
3672 		break;
3673 	case ISCSI_UEVENT_NEW_FLASHNODE:
3674 		err = iscsi_new_flashnode(transport, ev,
3675 					  nlmsg_attrlen(nlh, sizeof(*ev)));
3676 		break;
3677 	case ISCSI_UEVENT_DEL_FLASHNODE:
3678 		err = iscsi_del_flashnode(transport, ev);
3679 		break;
3680 	case ISCSI_UEVENT_LOGIN_FLASHNODE:
3681 		err = iscsi_login_flashnode(transport, ev);
3682 		break;
3683 	case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3684 		err = iscsi_logout_flashnode(transport, ev);
3685 		break;
3686 	case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3687 		err = iscsi_logout_flashnode_sid(transport, ev);
3688 		break;
3689 	case ISCSI_UEVENT_SET_CHAP:
3690 		err = iscsi_set_chap(transport, ev,
3691 				     nlmsg_attrlen(nlh, sizeof(*ev)));
3692 		break;
3693 	case ISCSI_UEVENT_GET_HOST_STATS:
3694 		err = iscsi_get_host_stats(transport, nlh);
3695 		break;
3696 	default:
3697 		err = -ENOSYS;
3698 		break;
3699 	}
3700 
3701 	module_put(transport->owner);
3702 	return err;
3703 }
3704 
3705 /*
3706  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3707  * Malformed skbs with wrong lengths or invalid creds are not processed.
3708  */
3709 static void
3710 iscsi_if_rx(struct sk_buff *skb)
3711 {
3712 	u32 portid = NETLINK_CB(skb).portid;
3713 
3714 	mutex_lock(&rx_queue_mutex);
3715 	while (skb->len >= NLMSG_HDRLEN) {
3716 		int err;
3717 		uint32_t rlen;
3718 		struct nlmsghdr	*nlh;
3719 		struct iscsi_uevent *ev;
3720 		uint32_t group;
3721 		int retries = ISCSI_SEND_MAX_ALLOWED;
3722 
3723 		nlh = nlmsg_hdr(skb);
3724 		if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3725 		    skb->len < nlh->nlmsg_len) {
3726 			break;
3727 		}
3728 
3729 		ev = nlmsg_data(nlh);
3730 		rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3731 		if (rlen > skb->len)
3732 			rlen = skb->len;
3733 
3734 		err = iscsi_if_recv_msg(skb, nlh, &group);
3735 		if (err) {
3736 			ev->type = ISCSI_KEVENT_IF_ERROR;
3737 			ev->iferror = err;
3738 		}
3739 		do {
3740 			/*
3741 			 * special case for GET_STATS:
3742 			 * on success - sending reply and stats from
3743 			 * inside of if_recv_msg(),
3744 			 * on error - fall through.
3745 			 */
3746 			if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3747 				break;
3748 			if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3749 				break;
3750 			err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
3751 						  ev, sizeof(*ev));
3752 			if (err == -EAGAIN && --retries < 0) {
3753 				printk(KERN_WARNING "Send reply failed, error %d\n", err);
3754 				break;
3755 			}
3756 		} while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3757 		skb_pull(skb, rlen);
3758 	}
3759 	mutex_unlock(&rx_queue_mutex);
3760 }
3761 
3762 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)		\
3763 struct device_attribute dev_attr_##_prefix##_##_name =	\
3764 	__ATTR(_name,_mode,_show,_store)
3765 
3766 /*
3767  * iSCSI connection attrs
3768  */
3769 #define iscsi_conn_attr_show(param)					\
3770 static ssize_t								\
3771 show_conn_param_##param(struct device *dev, 				\
3772 			struct device_attribute *attr, char *buf)	\
3773 {									\
3774 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);	\
3775 	struct iscsi_transport *t = conn->transport;			\
3776 	return t->get_conn_param(conn, param, buf);			\
3777 }
3778 
3779 #define iscsi_conn_attr(field, param)					\
3780 	iscsi_conn_attr_show(param)					\
3781 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,	\
3782 			NULL);
3783 
3784 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3785 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3786 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3787 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3788 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3789 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3790 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3791 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3792 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3793 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3794 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3795 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3796 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3797 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3798 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3799 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3800 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3801 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3802 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3803 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3804 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3805 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3806 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3807 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3808 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3809 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3810 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3811 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3812 
3813 
3814 #define iscsi_conn_ep_attr_show(param)					\
3815 static ssize_t show_conn_ep_param_##param(struct device *dev,		\
3816 					  struct device_attribute *attr,\
3817 					  char *buf)			\
3818 {									\
3819 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);	\
3820 	struct iscsi_transport *t = conn->transport;			\
3821 	struct iscsi_endpoint *ep;					\
3822 	ssize_t rc;							\
3823 									\
3824 	/*								\
3825 	 * Need to make sure ep_disconnect does not free the LLD's	\
3826 	 * interconnect resources while we are trying to read them.	\
3827 	 */								\
3828 	mutex_lock(&conn->ep_mutex);					\
3829 	ep = conn->ep;							\
3830 	if (!ep && t->ep_connect) {					\
3831 		mutex_unlock(&conn->ep_mutex);				\
3832 		return -ENOTCONN;					\
3833 	}								\
3834 									\
3835 	if (ep)								\
3836 		rc = t->get_ep_param(ep, param, buf);			\
3837 	else								\
3838 		rc = t->get_conn_param(conn, param, buf);		\
3839 	mutex_unlock(&conn->ep_mutex);					\
3840 	return rc;							\
3841 }
3842 
3843 #define iscsi_conn_ep_attr(field, param)				\
3844 	iscsi_conn_ep_attr_show(param)					\
3845 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,				\
3846 			show_conn_ep_param_##param, NULL);
3847 
3848 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
3849 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
3850 
3851 static struct attribute *iscsi_conn_attrs[] = {
3852 	&dev_attr_conn_max_recv_dlength.attr,
3853 	&dev_attr_conn_max_xmit_dlength.attr,
3854 	&dev_attr_conn_header_digest.attr,
3855 	&dev_attr_conn_data_digest.attr,
3856 	&dev_attr_conn_ifmarker.attr,
3857 	&dev_attr_conn_ofmarker.attr,
3858 	&dev_attr_conn_address.attr,
3859 	&dev_attr_conn_port.attr,
3860 	&dev_attr_conn_exp_statsn.attr,
3861 	&dev_attr_conn_persistent_address.attr,
3862 	&dev_attr_conn_persistent_port.attr,
3863 	&dev_attr_conn_ping_tmo.attr,
3864 	&dev_attr_conn_recv_tmo.attr,
3865 	&dev_attr_conn_local_port.attr,
3866 	&dev_attr_conn_statsn.attr,
3867 	&dev_attr_conn_keepalive_tmo.attr,
3868 	&dev_attr_conn_max_segment_size.attr,
3869 	&dev_attr_conn_tcp_timestamp_stat.attr,
3870 	&dev_attr_conn_tcp_wsf_disable.attr,
3871 	&dev_attr_conn_tcp_nagle_disable.attr,
3872 	&dev_attr_conn_tcp_timer_scale.attr,
3873 	&dev_attr_conn_tcp_timestamp_enable.attr,
3874 	&dev_attr_conn_fragment_disable.attr,
3875 	&dev_attr_conn_ipv4_tos.attr,
3876 	&dev_attr_conn_ipv6_traffic_class.attr,
3877 	&dev_attr_conn_ipv6_flow_label.attr,
3878 	&dev_attr_conn_is_fw_assigned_ipv6.attr,
3879 	&dev_attr_conn_tcp_xmit_wsf.attr,
3880 	&dev_attr_conn_tcp_recv_wsf.attr,
3881 	&dev_attr_conn_local_ipaddr.attr,
3882 	NULL,
3883 };
3884 
3885 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
3886 					 struct attribute *attr, int i)
3887 {
3888 	struct device *cdev = container_of(kobj, struct device, kobj);
3889 	struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
3890 	struct iscsi_transport *t = conn->transport;
3891 	int param;
3892 
3893 	if (attr == &dev_attr_conn_max_recv_dlength.attr)
3894 		param = ISCSI_PARAM_MAX_RECV_DLENGTH;
3895 	else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
3896 		param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
3897 	else if (attr == &dev_attr_conn_header_digest.attr)
3898 		param = ISCSI_PARAM_HDRDGST_EN;
3899 	else if (attr == &dev_attr_conn_data_digest.attr)
3900 		param = ISCSI_PARAM_DATADGST_EN;
3901 	else if (attr == &dev_attr_conn_ifmarker.attr)
3902 		param = ISCSI_PARAM_IFMARKER_EN;
3903 	else if (attr == &dev_attr_conn_ofmarker.attr)
3904 		param = ISCSI_PARAM_OFMARKER_EN;
3905 	else if (attr == &dev_attr_conn_address.attr)
3906 		param = ISCSI_PARAM_CONN_ADDRESS;
3907 	else if (attr == &dev_attr_conn_port.attr)
3908 		param = ISCSI_PARAM_CONN_PORT;
3909 	else if (attr == &dev_attr_conn_exp_statsn.attr)
3910 		param = ISCSI_PARAM_EXP_STATSN;
3911 	else if (attr == &dev_attr_conn_persistent_address.attr)
3912 		param = ISCSI_PARAM_PERSISTENT_ADDRESS;
3913 	else if (attr == &dev_attr_conn_persistent_port.attr)
3914 		param = ISCSI_PARAM_PERSISTENT_PORT;
3915 	else if (attr == &dev_attr_conn_ping_tmo.attr)
3916 		param = ISCSI_PARAM_PING_TMO;
3917 	else if (attr == &dev_attr_conn_recv_tmo.attr)
3918 		param = ISCSI_PARAM_RECV_TMO;
3919 	else if (attr == &dev_attr_conn_local_port.attr)
3920 		param = ISCSI_PARAM_LOCAL_PORT;
3921 	else if (attr == &dev_attr_conn_statsn.attr)
3922 		param = ISCSI_PARAM_STATSN;
3923 	else if (attr == &dev_attr_conn_keepalive_tmo.attr)
3924 		param = ISCSI_PARAM_KEEPALIVE_TMO;
3925 	else if (attr == &dev_attr_conn_max_segment_size.attr)
3926 		param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
3927 	else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
3928 		param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
3929 	else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
3930 		param = ISCSI_PARAM_TCP_WSF_DISABLE;
3931 	else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
3932 		param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
3933 	else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
3934 		param = ISCSI_PARAM_TCP_TIMER_SCALE;
3935 	else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
3936 		param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
3937 	else if (attr == &dev_attr_conn_fragment_disable.attr)
3938 		param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
3939 	else if (attr == &dev_attr_conn_ipv4_tos.attr)
3940 		param = ISCSI_PARAM_IPV4_TOS;
3941 	else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
3942 		param = ISCSI_PARAM_IPV6_TC;
3943 	else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
3944 		param = ISCSI_PARAM_IPV6_FLOW_LABEL;
3945 	else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
3946 		param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
3947 	else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
3948 		param = ISCSI_PARAM_TCP_XMIT_WSF;
3949 	else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
3950 		param = ISCSI_PARAM_TCP_RECV_WSF;
3951 	else if (attr == &dev_attr_conn_local_ipaddr.attr)
3952 		param = ISCSI_PARAM_LOCAL_IPADDR;
3953 	else {
3954 		WARN_ONCE(1, "Invalid conn attr");
3955 		return 0;
3956 	}
3957 
3958 	return t->attr_is_visible(ISCSI_PARAM, param);
3959 }
3960 
3961 static struct attribute_group iscsi_conn_group = {
3962 	.attrs = iscsi_conn_attrs,
3963 	.is_visible = iscsi_conn_attr_is_visible,
3964 };
3965 
3966 /*
3967  * iSCSI session attrs
3968  */
3969 #define iscsi_session_attr_show(param, perm)				\
3970 static ssize_t								\
3971 show_session_param_##param(struct device *dev,				\
3972 			   struct device_attribute *attr, char *buf)	\
3973 {									\
3974 	struct iscsi_cls_session *session = 				\
3975 		iscsi_dev_to_session(dev->parent);			\
3976 	struct iscsi_transport *t = session->transport;			\
3977 									\
3978 	if (perm && !capable(CAP_SYS_ADMIN))				\
3979 		return -EACCES;						\
3980 	return t->get_session_param(session, param, buf);		\
3981 }
3982 
3983 #define iscsi_session_attr(field, param, perm)				\
3984 	iscsi_session_attr_show(param, perm)				\
3985 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
3986 			NULL);
3987 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
3988 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
3989 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
3990 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
3991 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
3992 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
3993 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
3994 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
3995 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
3996 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
3997 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
3998 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
3999 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4000 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4001 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4002 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4003 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4004 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4005 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4006 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4007 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4008 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4009 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4010 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4011 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4012 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4013 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4014 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4015 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4016 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4017 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4018 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4019 iscsi_session_attr(discovery_auth_optional,
4020 		   ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4021 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4022 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4023 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4024 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4025 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4026 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4027 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4028 
4029 static ssize_t
4030 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4031 			char *buf)
4032 {
4033 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4034 	return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
4035 }
4036 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4037 			NULL);
4038 static ssize_t
4039 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4040 			char *buf)
4041 {
4042 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4043 	return sprintf(buf, "%d\n", session->creator);
4044 }
4045 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4046 			NULL);
4047 static ssize_t
4048 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4049 			    char *buf)
4050 {
4051 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4052 	return sprintf(buf, "%d\n", session->target_id);
4053 }
4054 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4055 			show_priv_session_target_id, NULL);
4056 
4057 #define iscsi_priv_session_attr_show(field, format)			\
4058 static ssize_t								\
4059 show_priv_session_##field(struct device *dev, 				\
4060 			  struct device_attribute *attr, char *buf)	\
4061 {									\
4062 	struct iscsi_cls_session *session = 				\
4063 			iscsi_dev_to_session(dev->parent);		\
4064 	if (session->field == -1)					\
4065 		return sprintf(buf, "off\n");				\
4066 	return sprintf(buf, format"\n", session->field);		\
4067 }
4068 
4069 #define iscsi_priv_session_attr_store(field)				\
4070 static ssize_t								\
4071 store_priv_session_##field(struct device *dev,				\
4072 			   struct device_attribute *attr,		\
4073 			   const char *buf, size_t count)		\
4074 {									\
4075 	int val;							\
4076 	char *cp;							\
4077 	struct iscsi_cls_session *session =				\
4078 		iscsi_dev_to_session(dev->parent);			\
4079 	if ((session->state == ISCSI_SESSION_FREE) ||			\
4080 	    (session->state == ISCSI_SESSION_FAILED))			\
4081 		return -EBUSY;						\
4082 	if (strncmp(buf, "off", 3) == 0) {				\
4083 		session->field = -1;					\
4084 		session->field##_sysfs_override = true;			\
4085 	} else {							\
4086 		val = simple_strtoul(buf, &cp, 0);			\
4087 		if (*cp != '\0' && *cp != '\n')				\
4088 			return -EINVAL;					\
4089 		session->field = val;					\
4090 		session->field##_sysfs_override = true;			\
4091 	}								\
4092 	return count;							\
4093 }
4094 
4095 #define iscsi_priv_session_rw_attr(field, format)			\
4096 	iscsi_priv_session_attr_show(field, format)			\
4097 	iscsi_priv_session_attr_store(field)				\
4098 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,		\
4099 			show_priv_session_##field,			\
4100 			store_priv_session_##field)
4101 
4102 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4103 
4104 static struct attribute *iscsi_session_attrs[] = {
4105 	&dev_attr_sess_initial_r2t.attr,
4106 	&dev_attr_sess_max_outstanding_r2t.attr,
4107 	&dev_attr_sess_immediate_data.attr,
4108 	&dev_attr_sess_first_burst_len.attr,
4109 	&dev_attr_sess_max_burst_len.attr,
4110 	&dev_attr_sess_data_pdu_in_order.attr,
4111 	&dev_attr_sess_data_seq_in_order.attr,
4112 	&dev_attr_sess_erl.attr,
4113 	&dev_attr_sess_targetname.attr,
4114 	&dev_attr_sess_tpgt.attr,
4115 	&dev_attr_sess_password.attr,
4116 	&dev_attr_sess_password_in.attr,
4117 	&dev_attr_sess_username.attr,
4118 	&dev_attr_sess_username_in.attr,
4119 	&dev_attr_sess_fast_abort.attr,
4120 	&dev_attr_sess_abort_tmo.attr,
4121 	&dev_attr_sess_lu_reset_tmo.attr,
4122 	&dev_attr_sess_tgt_reset_tmo.attr,
4123 	&dev_attr_sess_ifacename.attr,
4124 	&dev_attr_sess_initiatorname.attr,
4125 	&dev_attr_sess_targetalias.attr,
4126 	&dev_attr_sess_boot_root.attr,
4127 	&dev_attr_sess_boot_nic.attr,
4128 	&dev_attr_sess_boot_target.attr,
4129 	&dev_attr_priv_sess_recovery_tmo.attr,
4130 	&dev_attr_priv_sess_state.attr,
4131 	&dev_attr_priv_sess_creator.attr,
4132 	&dev_attr_sess_chap_out_idx.attr,
4133 	&dev_attr_sess_chap_in_idx.attr,
4134 	&dev_attr_priv_sess_target_id.attr,
4135 	&dev_attr_sess_auto_snd_tgt_disable.attr,
4136 	&dev_attr_sess_discovery_session.attr,
4137 	&dev_attr_sess_portal_type.attr,
4138 	&dev_attr_sess_chap_auth.attr,
4139 	&dev_attr_sess_discovery_logout.attr,
4140 	&dev_attr_sess_bidi_chap.attr,
4141 	&dev_attr_sess_discovery_auth_optional.attr,
4142 	&dev_attr_sess_def_time2wait.attr,
4143 	&dev_attr_sess_def_time2retain.attr,
4144 	&dev_attr_sess_isid.attr,
4145 	&dev_attr_sess_tsid.attr,
4146 	&dev_attr_sess_def_taskmgmt_tmo.attr,
4147 	&dev_attr_sess_discovery_parent_idx.attr,
4148 	&dev_attr_sess_discovery_parent_type.attr,
4149 	NULL,
4150 };
4151 
4152 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4153 					    struct attribute *attr, int i)
4154 {
4155 	struct device *cdev = container_of(kobj, struct device, kobj);
4156 	struct iscsi_cls_session *session = transport_class_to_session(cdev);
4157 	struct iscsi_transport *t = session->transport;
4158 	int param;
4159 
4160 	if (attr == &dev_attr_sess_initial_r2t.attr)
4161 		param = ISCSI_PARAM_INITIAL_R2T_EN;
4162 	else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4163 		param = ISCSI_PARAM_MAX_R2T;
4164 	else if (attr == &dev_attr_sess_immediate_data.attr)
4165 		param = ISCSI_PARAM_IMM_DATA_EN;
4166 	else if (attr == &dev_attr_sess_first_burst_len.attr)
4167 		param = ISCSI_PARAM_FIRST_BURST;
4168 	else if (attr == &dev_attr_sess_max_burst_len.attr)
4169 		param = ISCSI_PARAM_MAX_BURST;
4170 	else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4171 		param = ISCSI_PARAM_PDU_INORDER_EN;
4172 	else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4173 		param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4174 	else if (attr == &dev_attr_sess_erl.attr)
4175 		param = ISCSI_PARAM_ERL;
4176 	else if (attr == &dev_attr_sess_targetname.attr)
4177 		param = ISCSI_PARAM_TARGET_NAME;
4178 	else if (attr == &dev_attr_sess_tpgt.attr)
4179 		param = ISCSI_PARAM_TPGT;
4180 	else if (attr == &dev_attr_sess_chap_in_idx.attr)
4181 		param = ISCSI_PARAM_CHAP_IN_IDX;
4182 	else if (attr == &dev_attr_sess_chap_out_idx.attr)
4183 		param = ISCSI_PARAM_CHAP_OUT_IDX;
4184 	else if (attr == &dev_attr_sess_password.attr)
4185 		param = ISCSI_PARAM_USERNAME;
4186 	else if (attr == &dev_attr_sess_password_in.attr)
4187 		param = ISCSI_PARAM_USERNAME_IN;
4188 	else if (attr == &dev_attr_sess_username.attr)
4189 		param = ISCSI_PARAM_PASSWORD;
4190 	else if (attr == &dev_attr_sess_username_in.attr)
4191 		param = ISCSI_PARAM_PASSWORD_IN;
4192 	else if (attr == &dev_attr_sess_fast_abort.attr)
4193 		param = ISCSI_PARAM_FAST_ABORT;
4194 	else if (attr == &dev_attr_sess_abort_tmo.attr)
4195 		param = ISCSI_PARAM_ABORT_TMO;
4196 	else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4197 		param = ISCSI_PARAM_LU_RESET_TMO;
4198 	else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4199 		param = ISCSI_PARAM_TGT_RESET_TMO;
4200 	else if (attr == &dev_attr_sess_ifacename.attr)
4201 		param = ISCSI_PARAM_IFACE_NAME;
4202 	else if (attr == &dev_attr_sess_initiatorname.attr)
4203 		param = ISCSI_PARAM_INITIATOR_NAME;
4204 	else if (attr == &dev_attr_sess_targetalias.attr)
4205 		param = ISCSI_PARAM_TARGET_ALIAS;
4206 	else if (attr == &dev_attr_sess_boot_root.attr)
4207 		param = ISCSI_PARAM_BOOT_ROOT;
4208 	else if (attr == &dev_attr_sess_boot_nic.attr)
4209 		param = ISCSI_PARAM_BOOT_NIC;
4210 	else if (attr == &dev_attr_sess_boot_target.attr)
4211 		param = ISCSI_PARAM_BOOT_TARGET;
4212 	else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4213 		param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4214 	else if (attr == &dev_attr_sess_discovery_session.attr)
4215 		param = ISCSI_PARAM_DISCOVERY_SESS;
4216 	else if (attr == &dev_attr_sess_portal_type.attr)
4217 		param = ISCSI_PARAM_PORTAL_TYPE;
4218 	else if (attr == &dev_attr_sess_chap_auth.attr)
4219 		param = ISCSI_PARAM_CHAP_AUTH_EN;
4220 	else if (attr == &dev_attr_sess_discovery_logout.attr)
4221 		param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4222 	else if (attr == &dev_attr_sess_bidi_chap.attr)
4223 		param = ISCSI_PARAM_BIDI_CHAP_EN;
4224 	else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4225 		param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4226 	else if (attr == &dev_attr_sess_def_time2wait.attr)
4227 		param = ISCSI_PARAM_DEF_TIME2WAIT;
4228 	else if (attr == &dev_attr_sess_def_time2retain.attr)
4229 		param = ISCSI_PARAM_DEF_TIME2RETAIN;
4230 	else if (attr == &dev_attr_sess_isid.attr)
4231 		param = ISCSI_PARAM_ISID;
4232 	else if (attr == &dev_attr_sess_tsid.attr)
4233 		param = ISCSI_PARAM_TSID;
4234 	else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4235 		param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4236 	else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4237 		param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4238 	else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4239 		param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4240 	else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4241 		return S_IRUGO | S_IWUSR;
4242 	else if (attr == &dev_attr_priv_sess_state.attr)
4243 		return S_IRUGO;
4244 	else if (attr == &dev_attr_priv_sess_creator.attr)
4245 		return S_IRUGO;
4246 	else if (attr == &dev_attr_priv_sess_target_id.attr)
4247 		return S_IRUGO;
4248 	else {
4249 		WARN_ONCE(1, "Invalid session attr");
4250 		return 0;
4251 	}
4252 
4253 	return t->attr_is_visible(ISCSI_PARAM, param);
4254 }
4255 
4256 static struct attribute_group iscsi_session_group = {
4257 	.attrs = iscsi_session_attrs,
4258 	.is_visible = iscsi_session_attr_is_visible,
4259 };
4260 
4261 /*
4262  * iSCSI host attrs
4263  */
4264 #define iscsi_host_attr_show(param)					\
4265 static ssize_t								\
4266 show_host_param_##param(struct device *dev, 				\
4267 			struct device_attribute *attr, char *buf)	\
4268 {									\
4269 	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
4270 	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4271 	return priv->iscsi_transport->get_host_param(shost, param, buf); \
4272 }
4273 
4274 #define iscsi_host_attr(field, param)					\
4275 	iscsi_host_attr_show(param)					\
4276 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,	\
4277 			NULL);
4278 
4279 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4280 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4281 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4282 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4283 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4284 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4285 
4286 static struct attribute *iscsi_host_attrs[] = {
4287 	&dev_attr_host_netdev.attr,
4288 	&dev_attr_host_hwaddress.attr,
4289 	&dev_attr_host_ipaddress.attr,
4290 	&dev_attr_host_initiatorname.attr,
4291 	&dev_attr_host_port_state.attr,
4292 	&dev_attr_host_port_speed.attr,
4293 	NULL,
4294 };
4295 
4296 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4297 					 struct attribute *attr, int i)
4298 {
4299 	struct device *cdev = container_of(kobj, struct device, kobj);
4300 	struct Scsi_Host *shost = transport_class_to_shost(cdev);
4301 	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4302 	int param;
4303 
4304 	if (attr == &dev_attr_host_netdev.attr)
4305 		param = ISCSI_HOST_PARAM_NETDEV_NAME;
4306 	else if (attr == &dev_attr_host_hwaddress.attr)
4307 		param = ISCSI_HOST_PARAM_HWADDRESS;
4308 	else if (attr == &dev_attr_host_ipaddress.attr)
4309 		param = ISCSI_HOST_PARAM_IPADDRESS;
4310 	else if (attr == &dev_attr_host_initiatorname.attr)
4311 		param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4312 	else if (attr == &dev_attr_host_port_state.attr)
4313 		param = ISCSI_HOST_PARAM_PORT_STATE;
4314 	else if (attr == &dev_attr_host_port_speed.attr)
4315 		param = ISCSI_HOST_PARAM_PORT_SPEED;
4316 	else {
4317 		WARN_ONCE(1, "Invalid host attr");
4318 		return 0;
4319 	}
4320 
4321 	return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4322 }
4323 
4324 static struct attribute_group iscsi_host_group = {
4325 	.attrs = iscsi_host_attrs,
4326 	.is_visible = iscsi_host_attr_is_visible,
4327 };
4328 
4329 /* convert iscsi_port_speed values to ascii string name */
4330 static const struct {
4331 	enum iscsi_port_speed	value;
4332 	char			*name;
4333 } iscsi_port_speed_names[] = {
4334 	{ISCSI_PORT_SPEED_UNKNOWN,	"Unknown" },
4335 	{ISCSI_PORT_SPEED_10MBPS,	"10 Mbps" },
4336 	{ISCSI_PORT_SPEED_100MBPS,	"100 Mbps" },
4337 	{ISCSI_PORT_SPEED_1GBPS,	"1 Gbps" },
4338 	{ISCSI_PORT_SPEED_10GBPS,	"10 Gbps" },
4339 	{ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4340 	{ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4341 };
4342 
4343 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4344 {
4345 	int i;
4346 	char *speed = "Unknown!";
4347 	struct iscsi_cls_host *ihost = shost->shost_data;
4348 	uint32_t port_speed = ihost->port_speed;
4349 
4350 	for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4351 		if (iscsi_port_speed_names[i].value & port_speed) {
4352 			speed = iscsi_port_speed_names[i].name;
4353 			break;
4354 		}
4355 	}
4356 	return speed;
4357 }
4358 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4359 
4360 /* convert iscsi_port_state values to ascii string name */
4361 static const struct {
4362 	enum iscsi_port_state	value;
4363 	char			*name;
4364 } iscsi_port_state_names[] = {
4365 	{ISCSI_PORT_STATE_DOWN,		"LINK DOWN" },
4366 	{ISCSI_PORT_STATE_UP,		"LINK UP" },
4367 };
4368 
4369 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4370 {
4371 	int i;
4372 	char *state = "Unknown!";
4373 	struct iscsi_cls_host *ihost = shost->shost_data;
4374 	uint32_t port_state = ihost->port_state;
4375 
4376 	for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4377 		if (iscsi_port_state_names[i].value & port_state) {
4378 			state = iscsi_port_state_names[i].name;
4379 			break;
4380 		}
4381 	}
4382 	return state;
4383 }
4384 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4385 
4386 static int iscsi_session_match(struct attribute_container *cont,
4387 			   struct device *dev)
4388 {
4389 	struct iscsi_cls_session *session;
4390 	struct Scsi_Host *shost;
4391 	struct iscsi_internal *priv;
4392 
4393 	if (!iscsi_is_session_dev(dev))
4394 		return 0;
4395 
4396 	session = iscsi_dev_to_session(dev);
4397 	shost = iscsi_session_to_shost(session);
4398 	if (!shost->transportt)
4399 		return 0;
4400 
4401 	priv = to_iscsi_internal(shost->transportt);
4402 	if (priv->session_cont.ac.class != &iscsi_session_class.class)
4403 		return 0;
4404 
4405 	return &priv->session_cont.ac == cont;
4406 }
4407 
4408 static int iscsi_conn_match(struct attribute_container *cont,
4409 			   struct device *dev)
4410 {
4411 	struct iscsi_cls_session *session;
4412 	struct iscsi_cls_conn *conn;
4413 	struct Scsi_Host *shost;
4414 	struct iscsi_internal *priv;
4415 
4416 	if (!iscsi_is_conn_dev(dev))
4417 		return 0;
4418 
4419 	conn = iscsi_dev_to_conn(dev);
4420 	session = iscsi_dev_to_session(conn->dev.parent);
4421 	shost = iscsi_session_to_shost(session);
4422 
4423 	if (!shost->transportt)
4424 		return 0;
4425 
4426 	priv = to_iscsi_internal(shost->transportt);
4427 	if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4428 		return 0;
4429 
4430 	return &priv->conn_cont.ac == cont;
4431 }
4432 
4433 static int iscsi_host_match(struct attribute_container *cont,
4434 			    struct device *dev)
4435 {
4436 	struct Scsi_Host *shost;
4437 	struct iscsi_internal *priv;
4438 
4439 	if (!scsi_is_host_device(dev))
4440 		return 0;
4441 
4442 	shost = dev_to_shost(dev);
4443 	if (!shost->transportt  ||
4444 	    shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4445 		return 0;
4446 
4447         priv = to_iscsi_internal(shost->transportt);
4448         return &priv->t.host_attrs.ac == cont;
4449 }
4450 
4451 struct scsi_transport_template *
4452 iscsi_register_transport(struct iscsi_transport *tt)
4453 {
4454 	struct iscsi_internal *priv;
4455 	unsigned long flags;
4456 	int err;
4457 
4458 	BUG_ON(!tt);
4459 
4460 	priv = iscsi_if_transport_lookup(tt);
4461 	if (priv)
4462 		return NULL;
4463 
4464 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4465 	if (!priv)
4466 		return NULL;
4467 	INIT_LIST_HEAD(&priv->list);
4468 	priv->iscsi_transport = tt;
4469 	priv->t.user_scan = iscsi_user_scan;
4470 	priv->t.create_work_queue = 1;
4471 
4472 	priv->dev.class = &iscsi_transport_class;
4473 	dev_set_name(&priv->dev, "%s", tt->name);
4474 	err = device_register(&priv->dev);
4475 	if (err)
4476 		goto free_priv;
4477 
4478 	err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4479 	if (err)
4480 		goto unregister_dev;
4481 
4482 	/* host parameters */
4483 	priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4484 	priv->t.host_attrs.ac.match = iscsi_host_match;
4485 	priv->t.host_attrs.ac.grp = &iscsi_host_group;
4486 	priv->t.host_size = sizeof(struct iscsi_cls_host);
4487 	transport_container_register(&priv->t.host_attrs);
4488 
4489 	/* connection parameters */
4490 	priv->conn_cont.ac.class = &iscsi_connection_class.class;
4491 	priv->conn_cont.ac.match = iscsi_conn_match;
4492 	priv->conn_cont.ac.grp = &iscsi_conn_group;
4493 	transport_container_register(&priv->conn_cont);
4494 
4495 	/* session parameters */
4496 	priv->session_cont.ac.class = &iscsi_session_class.class;
4497 	priv->session_cont.ac.match = iscsi_session_match;
4498 	priv->session_cont.ac.grp = &iscsi_session_group;
4499 	transport_container_register(&priv->session_cont);
4500 
4501 	spin_lock_irqsave(&iscsi_transport_lock, flags);
4502 	list_add(&priv->list, &iscsi_transports);
4503 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4504 
4505 	printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4506 	return &priv->t;
4507 
4508 unregister_dev:
4509 	device_unregister(&priv->dev);
4510 	return NULL;
4511 free_priv:
4512 	kfree(priv);
4513 	return NULL;
4514 }
4515 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4516 
4517 int iscsi_unregister_transport(struct iscsi_transport *tt)
4518 {
4519 	struct iscsi_internal *priv;
4520 	unsigned long flags;
4521 
4522 	BUG_ON(!tt);
4523 
4524 	mutex_lock(&rx_queue_mutex);
4525 
4526 	priv = iscsi_if_transport_lookup(tt);
4527 	BUG_ON (!priv);
4528 
4529 	spin_lock_irqsave(&iscsi_transport_lock, flags);
4530 	list_del(&priv->list);
4531 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4532 
4533 	transport_container_unregister(&priv->conn_cont);
4534 	transport_container_unregister(&priv->session_cont);
4535 	transport_container_unregister(&priv->t.host_attrs);
4536 
4537 	sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4538 	device_unregister(&priv->dev);
4539 	mutex_unlock(&rx_queue_mutex);
4540 
4541 	return 0;
4542 }
4543 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4544 
4545 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4546 		     struct device *dev, const char *fmt, ...)
4547 {
4548 	struct va_format vaf;
4549 	va_list args;
4550 
4551 	va_start(args, fmt);
4552 	vaf.fmt = fmt;
4553 	vaf.va = &args;
4554 	trace(dev, &vaf);
4555 	va_end(args);
4556 }
4557 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4558 
4559 static __init int iscsi_transport_init(void)
4560 {
4561 	int err;
4562 	struct netlink_kernel_cfg cfg = {
4563 		.groups	= 1,
4564 		.input	= iscsi_if_rx,
4565 	};
4566 	printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4567 		ISCSI_TRANSPORT_VERSION);
4568 
4569 	atomic_set(&iscsi_session_nr, 0);
4570 
4571 	err = class_register(&iscsi_transport_class);
4572 	if (err)
4573 		return err;
4574 
4575 	err = class_register(&iscsi_endpoint_class);
4576 	if (err)
4577 		goto unregister_transport_class;
4578 
4579 	err = class_register(&iscsi_iface_class);
4580 	if (err)
4581 		goto unregister_endpoint_class;
4582 
4583 	err = transport_class_register(&iscsi_host_class);
4584 	if (err)
4585 		goto unregister_iface_class;
4586 
4587 	err = transport_class_register(&iscsi_connection_class);
4588 	if (err)
4589 		goto unregister_host_class;
4590 
4591 	err = transport_class_register(&iscsi_session_class);
4592 	if (err)
4593 		goto unregister_conn_class;
4594 
4595 	err = bus_register(&iscsi_flashnode_bus);
4596 	if (err)
4597 		goto unregister_session_class;
4598 
4599 	nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4600 	if (!nls) {
4601 		err = -ENOBUFS;
4602 		goto unregister_flashnode_bus;
4603 	}
4604 
4605 	iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
4606 	if (!iscsi_eh_timer_workq) {
4607 		err = -ENOMEM;
4608 		goto release_nls;
4609 	}
4610 
4611 	return 0;
4612 
4613 release_nls:
4614 	netlink_kernel_release(nls);
4615 unregister_flashnode_bus:
4616 	bus_unregister(&iscsi_flashnode_bus);
4617 unregister_session_class:
4618 	transport_class_unregister(&iscsi_session_class);
4619 unregister_conn_class:
4620 	transport_class_unregister(&iscsi_connection_class);
4621 unregister_host_class:
4622 	transport_class_unregister(&iscsi_host_class);
4623 unregister_iface_class:
4624 	class_unregister(&iscsi_iface_class);
4625 unregister_endpoint_class:
4626 	class_unregister(&iscsi_endpoint_class);
4627 unregister_transport_class:
4628 	class_unregister(&iscsi_transport_class);
4629 	return err;
4630 }
4631 
4632 static void __exit iscsi_transport_exit(void)
4633 {
4634 	destroy_workqueue(iscsi_eh_timer_workq);
4635 	netlink_kernel_release(nls);
4636 	bus_unregister(&iscsi_flashnode_bus);
4637 	transport_class_unregister(&iscsi_connection_class);
4638 	transport_class_unregister(&iscsi_session_class);
4639 	transport_class_unregister(&iscsi_host_class);
4640 	class_unregister(&iscsi_endpoint_class);
4641 	class_unregister(&iscsi_iface_class);
4642 	class_unregister(&iscsi_transport_class);
4643 }
4644 
4645 module_init(iscsi_transport_init);
4646 module_exit(iscsi_transport_exit);
4647 
4648 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4649 	      "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4650 	      "Alex Aizman <itn780@yahoo.com>");
4651 MODULE_DESCRIPTION("iSCSI Transport Interface");
4652 MODULE_LICENSE("GPL");
4653 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4654 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
4655