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 DEFINE_IDR(iscsi_ep_idr);
90 static DEFINE_MUTEX(iscsi_ep_idr_mutex);
91 
92 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
93 
94 static struct workqueue_struct *iscsi_conn_cleanup_workq;
95 
96 static DEFINE_IDA(iscsi_sess_ida);
97 /*
98  * list of registered transports and lock that must
99  * be held while accessing list. The iscsi_transport_lock must
100  * be acquired after the rx_queue_mutex.
101  */
102 static LIST_HEAD(iscsi_transports);
103 static DEFINE_SPINLOCK(iscsi_transport_lock);
104 
105 #define to_iscsi_internal(tmpl) \
106 	container_of(tmpl, struct iscsi_internal, t)
107 
108 #define dev_to_iscsi_internal(_dev) \
109 	container_of(_dev, struct iscsi_internal, dev)
110 
111 static void iscsi_transport_release(struct device *dev)
112 {
113 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
114 	kfree(priv);
115 }
116 
117 /*
118  * iscsi_transport_class represents the iscsi_transports that are
119  * registered.
120  */
121 static struct class iscsi_transport_class = {
122 	.name = "iscsi_transport",
123 	.dev_release = iscsi_transport_release,
124 };
125 
126 static ssize_t
127 show_transport_handle(struct device *dev, struct device_attribute *attr,
128 		      char *buf)
129 {
130 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
131 
132 	if (!capable(CAP_SYS_ADMIN))
133 		return -EACCES;
134 	return sysfs_emit(buf, "%llu\n",
135 		  (unsigned long long)iscsi_handle(priv->iscsi_transport));
136 }
137 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
138 
139 #define show_transport_attr(name, format)				\
140 static ssize_t								\
141 show_transport_##name(struct device *dev, 				\
142 		      struct device_attribute *attr,char *buf)		\
143 {									\
144 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);	\
145 	return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
146 }									\
147 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
148 
149 show_transport_attr(caps, "0x%x");
150 
151 static struct attribute *iscsi_transport_attrs[] = {
152 	&dev_attr_handle.attr,
153 	&dev_attr_caps.attr,
154 	NULL,
155 };
156 
157 static struct attribute_group iscsi_transport_group = {
158 	.attrs = iscsi_transport_attrs,
159 };
160 
161 /*
162  * iSCSI endpoint attrs
163  */
164 #define iscsi_dev_to_endpoint(_dev) \
165 	container_of(_dev, struct iscsi_endpoint, dev)
166 
167 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)	\
168 struct device_attribute dev_attr_##_prefix##_##_name =	\
169         __ATTR(_name,_mode,_show,_store)
170 
171 static void iscsi_endpoint_release(struct device *dev)
172 {
173 	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
174 
175 	mutex_lock(&iscsi_ep_idr_mutex);
176 	idr_remove(&iscsi_ep_idr, ep->id);
177 	mutex_unlock(&iscsi_ep_idr_mutex);
178 
179 	kfree(ep);
180 }
181 
182 static struct class iscsi_endpoint_class = {
183 	.name = "iscsi_endpoint",
184 	.dev_release = iscsi_endpoint_release,
185 };
186 
187 static ssize_t
188 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
189 {
190 	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
191 	return sysfs_emit(buf, "%d\n", ep->id);
192 }
193 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
194 
195 static struct attribute *iscsi_endpoint_attrs[] = {
196 	&dev_attr_ep_handle.attr,
197 	NULL,
198 };
199 
200 static struct attribute_group iscsi_endpoint_group = {
201 	.attrs = iscsi_endpoint_attrs,
202 };
203 
204 struct iscsi_endpoint *
205 iscsi_create_endpoint(int dd_size)
206 {
207 	struct iscsi_endpoint *ep;
208 	int err, id;
209 
210 	ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
211 	if (!ep)
212 		return NULL;
213 
214 	mutex_lock(&iscsi_ep_idr_mutex);
215 
216 	/*
217 	 * First endpoint id should be 1 to comply with user space
218 	 * applications (iscsid).
219 	 */
220 	id = idr_alloc(&iscsi_ep_idr, ep, 1, -1, GFP_NOIO);
221 	if (id < 0) {
222 		mutex_unlock(&iscsi_ep_idr_mutex);
223 		printk(KERN_ERR "Could not allocate endpoint ID. Error %d.\n",
224 		       id);
225 		goto free_ep;
226 	}
227 	mutex_unlock(&iscsi_ep_idr_mutex);
228 
229 	ep->id = id;
230 	ep->dev.class = &iscsi_endpoint_class;
231 	dev_set_name(&ep->dev, "ep-%d", id);
232 	err = device_register(&ep->dev);
233         if (err)
234 		goto free_id;
235 
236 	err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
237 	if (err)
238 		goto unregister_dev;
239 
240 	if (dd_size)
241 		ep->dd_data = &ep[1];
242 	return ep;
243 
244 unregister_dev:
245 	device_unregister(&ep->dev);
246 	return NULL;
247 
248 free_id:
249 	mutex_lock(&iscsi_ep_idr_mutex);
250 	idr_remove(&iscsi_ep_idr, id);
251 	mutex_unlock(&iscsi_ep_idr_mutex);
252 free_ep:
253 	kfree(ep);
254 	return NULL;
255 }
256 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
257 
258 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
259 {
260 	sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
261 	device_unregister(&ep->dev);
262 }
263 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
264 
265 void iscsi_put_endpoint(struct iscsi_endpoint *ep)
266 {
267 	put_device(&ep->dev);
268 }
269 EXPORT_SYMBOL_GPL(iscsi_put_endpoint);
270 
271 /**
272  * iscsi_lookup_endpoint - get ep from handle
273  * @handle: endpoint handle
274  *
275  * Caller must do a iscsi_put_endpoint.
276  */
277 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
278 {
279 	struct iscsi_endpoint *ep;
280 
281 	mutex_lock(&iscsi_ep_idr_mutex);
282 	ep = idr_find(&iscsi_ep_idr, handle);
283 	if (!ep)
284 		goto unlock;
285 
286 	get_device(&ep->dev);
287 unlock:
288 	mutex_unlock(&iscsi_ep_idr_mutex);
289 	return ep;
290 }
291 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
292 
293 /*
294  * Interface to display network param to sysfs
295  */
296 
297 static void iscsi_iface_release(struct device *dev)
298 {
299 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
300 	struct device *parent = iface->dev.parent;
301 
302 	kfree(iface);
303 	put_device(parent);
304 }
305 
306 
307 static struct class iscsi_iface_class = {
308 	.name = "iscsi_iface",
309 	.dev_release = iscsi_iface_release,
310 };
311 
312 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)	\
313 struct device_attribute dev_attr_##_prefix##_##_name =		\
314 	__ATTR(_name, _mode, _show, _store)
315 
316 /* iface attrs show */
317 #define iscsi_iface_attr_show(type, name, param_type, param)		\
318 static ssize_t								\
319 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
320 		     char *buf)						\
321 {									\
322 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);		\
323 	struct iscsi_transport *t = iface->transport;			\
324 	return t->get_iface_param(iface, param_type, param, buf);	\
325 }									\
326 
327 #define iscsi_iface_net_attr(type, name, param)				\
328 	iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)	\
329 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
330 
331 #define iscsi_iface_attr(type, name, param)				\
332 	iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)	\
333 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
334 
335 /* generic read only ipv4 attribute */
336 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
337 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
338 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
339 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
340 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
341 		     ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
342 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
343 		     ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
344 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
345 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
346 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
347 		     ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
348 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
349 		     ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
350 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
351 		     ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
352 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
353 		     ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
354 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
355 		     ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
356 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
357 		     ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
358 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
359 		     ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
360 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
361 		     ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
362 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
363 		     ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
364 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
365 
366 /* generic read only ipv6 attribute */
367 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
368 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
369 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL);
370 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
371 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
372 		     ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
373 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
374 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
375 iscsi_iface_net_attr(ipv6_iface, link_local_state,
376 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
377 iscsi_iface_net_attr(ipv6_iface, router_state,
378 		     ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
379 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
380 		     ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
381 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
382 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
383 iscsi_iface_net_attr(ipv6_iface, traffic_class,
384 		     ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
385 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
386 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
387 		     ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
388 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
389 		     ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
390 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
391 		     ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
392 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
393 		     ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
394 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
395 		     ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
396 
397 /* common read only iface attribute */
398 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
399 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
400 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
401 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
402 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
403 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
404 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
405 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
406 iscsi_iface_net_attr(iface, tcp_nagle_disable,
407 		     ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
408 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
409 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
410 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
411 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
412 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
413 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
414 
415 /* common iscsi specific settings attributes */
416 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
417 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
418 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
419 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
420 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
421 iscsi_iface_attr(iface, data_seq_in_order,
422 		 ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
423 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
424 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
425 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
426 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
427 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
428 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
429 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
430 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
431 iscsi_iface_attr(iface, discovery_auth_optional,
432 		 ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
433 iscsi_iface_attr(iface, discovery_logout,
434 		 ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
435 iscsi_iface_attr(iface, strict_login_comp_en,
436 		 ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
437 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
438 
439 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
440 					  struct attribute *attr, int i)
441 {
442 	struct device *dev = container_of(kobj, struct device, kobj);
443 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
444 	struct iscsi_transport *t = iface->transport;
445 	int param = -1;
446 
447 	if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
448 		param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
449 	else if (attr == &dev_attr_iface_header_digest.attr)
450 		param = ISCSI_IFACE_PARAM_HDRDGST_EN;
451 	else if (attr == &dev_attr_iface_data_digest.attr)
452 		param = ISCSI_IFACE_PARAM_DATADGST_EN;
453 	else if (attr == &dev_attr_iface_immediate_data.attr)
454 		param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
455 	else if (attr == &dev_attr_iface_initial_r2t.attr)
456 		param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
457 	else if (attr == &dev_attr_iface_data_seq_in_order.attr)
458 		param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
459 	else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
460 		param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
461 	else if (attr == &dev_attr_iface_erl.attr)
462 		param = ISCSI_IFACE_PARAM_ERL;
463 	else if (attr == &dev_attr_iface_max_recv_dlength.attr)
464 		param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
465 	else if (attr == &dev_attr_iface_first_burst_len.attr)
466 		param = ISCSI_IFACE_PARAM_FIRST_BURST;
467 	else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
468 		param = ISCSI_IFACE_PARAM_MAX_R2T;
469 	else if (attr == &dev_attr_iface_max_burst_len.attr)
470 		param = ISCSI_IFACE_PARAM_MAX_BURST;
471 	else if (attr == &dev_attr_iface_chap_auth.attr)
472 		param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
473 	else if (attr == &dev_attr_iface_bidi_chap.attr)
474 		param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
475 	else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
476 		param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
477 	else if (attr == &dev_attr_iface_discovery_logout.attr)
478 		param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
479 	else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
480 		param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
481 	else if (attr == &dev_attr_iface_initiator_name.attr)
482 		param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
483 
484 	if (param != -1)
485 		return t->attr_is_visible(ISCSI_IFACE_PARAM, param);
486 
487 	if (attr == &dev_attr_iface_enabled.attr)
488 		param = ISCSI_NET_PARAM_IFACE_ENABLE;
489 	else if (attr == &dev_attr_iface_vlan_id.attr)
490 		param = ISCSI_NET_PARAM_VLAN_ID;
491 	else if (attr == &dev_attr_iface_vlan_priority.attr)
492 		param = ISCSI_NET_PARAM_VLAN_PRIORITY;
493 	else if (attr == &dev_attr_iface_vlan_enabled.attr)
494 		param = ISCSI_NET_PARAM_VLAN_ENABLED;
495 	else if (attr == &dev_attr_iface_mtu.attr)
496 		param = ISCSI_NET_PARAM_MTU;
497 	else if (attr == &dev_attr_iface_port.attr)
498 		param = ISCSI_NET_PARAM_PORT;
499 	else if (attr == &dev_attr_iface_ipaddress_state.attr)
500 		param = ISCSI_NET_PARAM_IPADDR_STATE;
501 	else if (attr == &dev_attr_iface_delayed_ack_en.attr)
502 		param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
503 	else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
504 		param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
505 	else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
506 		param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
507 	else if (attr == &dev_attr_iface_tcp_wsf.attr)
508 		param = ISCSI_NET_PARAM_TCP_WSF;
509 	else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
510 		param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
511 	else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
512 		param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
513 	else if (attr == &dev_attr_iface_cache_id.attr)
514 		param = ISCSI_NET_PARAM_CACHE_ID;
515 	else if (attr == &dev_attr_iface_redirect_en.attr)
516 		param = ISCSI_NET_PARAM_REDIRECT_EN;
517 	else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
518 		if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
519 			param = ISCSI_NET_PARAM_IPV4_ADDR;
520 		else if (attr == &dev_attr_ipv4_iface_gateway.attr)
521 			param = ISCSI_NET_PARAM_IPV4_GW;
522 		else if (attr == &dev_attr_ipv4_iface_subnet.attr)
523 			param = ISCSI_NET_PARAM_IPV4_SUBNET;
524 		else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
525 			param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
526 		else if (attr ==
527 			 &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
528 			param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
529 		else if (attr ==
530 			 &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
531 			param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
532 		else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
533 			param = ISCSI_NET_PARAM_IPV4_TOS_EN;
534 		else if (attr == &dev_attr_ipv4_iface_tos.attr)
535 			param = ISCSI_NET_PARAM_IPV4_TOS;
536 		else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
537 			param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
538 		else if (attr ==
539 			 &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
540 			param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
541 		else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
542 			param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
543 		else if (attr ==
544 			 &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
545 			param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
546 		else if (attr ==
547 			 &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
548 			param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
549 		else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
550 			param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
551 		else if (attr ==
552 			 &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
553 			param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
554 		else if (attr ==
555 			 &dev_attr_ipv4_iface_fragment_disable.attr)
556 			param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
557 		else if (attr ==
558 			 &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
559 			param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
560 		else if (attr == &dev_attr_ipv4_iface_ttl.attr)
561 			param = ISCSI_NET_PARAM_IPV4_TTL;
562 		else
563 			return 0;
564 	} else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
565 		if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
566 			param = ISCSI_NET_PARAM_IPV6_ADDR;
567 		else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
568 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
569 		else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
570 			param = ISCSI_NET_PARAM_IPV6_ROUTER;
571 		else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
572 			param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
573 		else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
574 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
575 		else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
576 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
577 		else if (attr == &dev_attr_ipv6_iface_router_state.attr)
578 			param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
579 		else if (attr ==
580 			 &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
581 			param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
582 		else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
583 			param = ISCSI_NET_PARAM_IPV6_MLD_EN;
584 		else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
585 			param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
586 		else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
587 			param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
588 		else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
589 			param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
590 		else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
591 			param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
592 		else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
593 			param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
594 		else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
595 			param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
596 		else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
597 			param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
598 		else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
599 			param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
600 		else
601 			return 0;
602 	} else {
603 		WARN_ONCE(1, "Invalid iface attr");
604 		return 0;
605 	}
606 
607 	return t->attr_is_visible(ISCSI_NET_PARAM, param);
608 }
609 
610 static struct attribute *iscsi_iface_attrs[] = {
611 	&dev_attr_iface_enabled.attr,
612 	&dev_attr_iface_vlan_id.attr,
613 	&dev_attr_iface_vlan_priority.attr,
614 	&dev_attr_iface_vlan_enabled.attr,
615 	&dev_attr_ipv4_iface_ipaddress.attr,
616 	&dev_attr_ipv4_iface_gateway.attr,
617 	&dev_attr_ipv4_iface_subnet.attr,
618 	&dev_attr_ipv4_iface_bootproto.attr,
619 	&dev_attr_ipv6_iface_ipaddress.attr,
620 	&dev_attr_ipv6_iface_link_local_addr.attr,
621 	&dev_attr_ipv6_iface_router_addr.attr,
622 	&dev_attr_ipv6_iface_ipaddr_autocfg.attr,
623 	&dev_attr_ipv6_iface_link_local_autocfg.attr,
624 	&dev_attr_iface_mtu.attr,
625 	&dev_attr_iface_port.attr,
626 	&dev_attr_iface_ipaddress_state.attr,
627 	&dev_attr_iface_delayed_ack_en.attr,
628 	&dev_attr_iface_tcp_nagle_disable.attr,
629 	&dev_attr_iface_tcp_wsf_disable.attr,
630 	&dev_attr_iface_tcp_wsf.attr,
631 	&dev_attr_iface_tcp_timer_scale.attr,
632 	&dev_attr_iface_tcp_timestamp_en.attr,
633 	&dev_attr_iface_cache_id.attr,
634 	&dev_attr_iface_redirect_en.attr,
635 	&dev_attr_iface_def_taskmgmt_tmo.attr,
636 	&dev_attr_iface_header_digest.attr,
637 	&dev_attr_iface_data_digest.attr,
638 	&dev_attr_iface_immediate_data.attr,
639 	&dev_attr_iface_initial_r2t.attr,
640 	&dev_attr_iface_data_seq_in_order.attr,
641 	&dev_attr_iface_data_pdu_in_order.attr,
642 	&dev_attr_iface_erl.attr,
643 	&dev_attr_iface_max_recv_dlength.attr,
644 	&dev_attr_iface_first_burst_len.attr,
645 	&dev_attr_iface_max_outstanding_r2t.attr,
646 	&dev_attr_iface_max_burst_len.attr,
647 	&dev_attr_iface_chap_auth.attr,
648 	&dev_attr_iface_bidi_chap.attr,
649 	&dev_attr_iface_discovery_auth_optional.attr,
650 	&dev_attr_iface_discovery_logout.attr,
651 	&dev_attr_iface_strict_login_comp_en.attr,
652 	&dev_attr_iface_initiator_name.attr,
653 	&dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
654 	&dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
655 	&dev_attr_ipv4_iface_tos_en.attr,
656 	&dev_attr_ipv4_iface_tos.attr,
657 	&dev_attr_ipv4_iface_grat_arp_en.attr,
658 	&dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
659 	&dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
660 	&dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
661 	&dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
662 	&dev_attr_ipv4_iface_dhcp_vendor_id.attr,
663 	&dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
664 	&dev_attr_ipv4_iface_fragment_disable.attr,
665 	&dev_attr_ipv4_iface_incoming_forwarding_en.attr,
666 	&dev_attr_ipv4_iface_ttl.attr,
667 	&dev_attr_ipv6_iface_link_local_state.attr,
668 	&dev_attr_ipv6_iface_router_state.attr,
669 	&dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
670 	&dev_attr_ipv6_iface_mld_en.attr,
671 	&dev_attr_ipv6_iface_flow_label.attr,
672 	&dev_attr_ipv6_iface_traffic_class.attr,
673 	&dev_attr_ipv6_iface_hop_limit.attr,
674 	&dev_attr_ipv6_iface_nd_reachable_tmo.attr,
675 	&dev_attr_ipv6_iface_nd_rexmit_time.attr,
676 	&dev_attr_ipv6_iface_nd_stale_tmo.attr,
677 	&dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
678 	&dev_attr_ipv6_iface_router_adv_link_mtu.attr,
679 	NULL,
680 };
681 
682 static struct attribute_group iscsi_iface_group = {
683 	.attrs = iscsi_iface_attrs,
684 	.is_visible = iscsi_iface_attr_is_visible,
685 };
686 
687 /* convert iscsi_ipaddress_state values to ascii string name */
688 static const struct {
689 	enum iscsi_ipaddress_state	value;
690 	char				*name;
691 } iscsi_ipaddress_state_names[] = {
692 	{ISCSI_IPDDRESS_STATE_UNCONFIGURED,	"Unconfigured" },
693 	{ISCSI_IPDDRESS_STATE_ACQUIRING,	"Acquiring" },
694 	{ISCSI_IPDDRESS_STATE_TENTATIVE,	"Tentative" },
695 	{ISCSI_IPDDRESS_STATE_VALID,		"Valid" },
696 	{ISCSI_IPDDRESS_STATE_DISABLING,	"Disabling" },
697 	{ISCSI_IPDDRESS_STATE_INVALID,		"Invalid" },
698 	{ISCSI_IPDDRESS_STATE_DEPRECATED,	"Deprecated" },
699 };
700 
701 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
702 {
703 	int i;
704 	char *state = NULL;
705 
706 	for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
707 		if (iscsi_ipaddress_state_names[i].value == port_state) {
708 			state = iscsi_ipaddress_state_names[i].name;
709 			break;
710 		}
711 	}
712 	return state;
713 }
714 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
715 
716 /* convert iscsi_router_state values to ascii string name */
717 static const struct {
718 	enum iscsi_router_state	value;
719 	char			*name;
720 } iscsi_router_state_names[] = {
721 	{ISCSI_ROUTER_STATE_UNKNOWN,		"Unknown" },
722 	{ISCSI_ROUTER_STATE_ADVERTISED,		"Advertised" },
723 	{ISCSI_ROUTER_STATE_MANUAL,		"Manual" },
724 	{ISCSI_ROUTER_STATE_STALE,		"Stale" },
725 };
726 
727 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
728 {
729 	int i;
730 	char *state = NULL;
731 
732 	for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
733 		if (iscsi_router_state_names[i].value == router_state) {
734 			state = iscsi_router_state_names[i].name;
735 			break;
736 		}
737 	}
738 	return state;
739 }
740 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
741 
742 struct iscsi_iface *
743 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
744 		   uint32_t iface_type, uint32_t iface_num, int dd_size)
745 {
746 	struct iscsi_iface *iface;
747 	int err;
748 
749 	iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
750 	if (!iface)
751 		return NULL;
752 
753 	iface->transport = transport;
754 	iface->iface_type = iface_type;
755 	iface->iface_num = iface_num;
756 	iface->dev.release = iscsi_iface_release;
757 	iface->dev.class = &iscsi_iface_class;
758 	/* parent reference released in iscsi_iface_release */
759 	iface->dev.parent = get_device(&shost->shost_gendev);
760 	if (iface_type == ISCSI_IFACE_TYPE_IPV4)
761 		dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
762 			     iface_num);
763 	else
764 		dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
765 			     iface_num);
766 
767 	err = device_register(&iface->dev);
768 	if (err)
769 		goto free_iface;
770 
771 	err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
772 	if (err)
773 		goto unreg_iface;
774 
775 	if (dd_size)
776 		iface->dd_data = &iface[1];
777 	return iface;
778 
779 unreg_iface:
780 	device_unregister(&iface->dev);
781 	return NULL;
782 
783 free_iface:
784 	put_device(iface->dev.parent);
785 	kfree(iface);
786 	return NULL;
787 }
788 EXPORT_SYMBOL_GPL(iscsi_create_iface);
789 
790 void iscsi_destroy_iface(struct iscsi_iface *iface)
791 {
792 	sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
793 	device_unregister(&iface->dev);
794 }
795 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
796 
797 /*
798  * Interface to display flash node params to sysfs
799  */
800 
801 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)	\
802 struct device_attribute dev_attr_##_prefix##_##_name =			\
803 	__ATTR(_name, _mode, _show, _store)
804 
805 /* flash node session attrs show */
806 #define iscsi_flashnode_sess_attr_show(type, name, param)		\
807 static ssize_t								\
808 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
809 		     char *buf)						\
810 {									\
811 	struct iscsi_bus_flash_session *fnode_sess =			\
812 					iscsi_dev_to_flash_session(dev);\
813 	struct iscsi_transport *t = fnode_sess->transport;		\
814 	return t->get_flashnode_param(fnode_sess, param, buf);		\
815 }									\
816 
817 
818 #define iscsi_flashnode_sess_attr(type, name, param)			\
819 	iscsi_flashnode_sess_attr_show(type, name, param)		\
820 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,			\
821 			    show_##type##_##name, NULL);
822 
823 /* Flash node session attributes */
824 
825 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
826 			  ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
827 iscsi_flashnode_sess_attr(fnode, discovery_session,
828 			  ISCSI_FLASHNODE_DISCOVERY_SESS);
829 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
830 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
831 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
832 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
833 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
834 			  ISCSI_FLASHNODE_DATASEQ_INORDER);
835 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
836 			  ISCSI_FLASHNODE_PDU_INORDER);
837 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
838 iscsi_flashnode_sess_attr(fnode, discovery_logout,
839 			  ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
840 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
841 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
842 			  ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
843 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
844 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
845 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
846 iscsi_flashnode_sess_attr(fnode, def_time2retain,
847 			  ISCSI_FLASHNODE_DEF_TIME2RETAIN);
848 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
849 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
850 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
851 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
852 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
853 			  ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
854 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
855 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
856 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
857 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
858 			  ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
859 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
860 			  ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
861 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
862 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
863 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
864 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
865 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
866 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
867 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
868 
869 static struct attribute *iscsi_flashnode_sess_attrs[] = {
870 	&dev_attr_fnode_auto_snd_tgt_disable.attr,
871 	&dev_attr_fnode_discovery_session.attr,
872 	&dev_attr_fnode_portal_type.attr,
873 	&dev_attr_fnode_entry_enable.attr,
874 	&dev_attr_fnode_immediate_data.attr,
875 	&dev_attr_fnode_initial_r2t.attr,
876 	&dev_attr_fnode_data_seq_in_order.attr,
877 	&dev_attr_fnode_data_pdu_in_order.attr,
878 	&dev_attr_fnode_chap_auth.attr,
879 	&dev_attr_fnode_discovery_logout.attr,
880 	&dev_attr_fnode_bidi_chap.attr,
881 	&dev_attr_fnode_discovery_auth_optional.attr,
882 	&dev_attr_fnode_erl.attr,
883 	&dev_attr_fnode_first_burst_len.attr,
884 	&dev_attr_fnode_def_time2wait.attr,
885 	&dev_attr_fnode_def_time2retain.attr,
886 	&dev_attr_fnode_max_outstanding_r2t.attr,
887 	&dev_attr_fnode_isid.attr,
888 	&dev_attr_fnode_tsid.attr,
889 	&dev_attr_fnode_max_burst_len.attr,
890 	&dev_attr_fnode_def_taskmgmt_tmo.attr,
891 	&dev_attr_fnode_targetalias.attr,
892 	&dev_attr_fnode_targetname.attr,
893 	&dev_attr_fnode_tpgt.attr,
894 	&dev_attr_fnode_discovery_parent_idx.attr,
895 	&dev_attr_fnode_discovery_parent_type.attr,
896 	&dev_attr_fnode_chap_in_idx.attr,
897 	&dev_attr_fnode_chap_out_idx.attr,
898 	&dev_attr_fnode_username.attr,
899 	&dev_attr_fnode_username_in.attr,
900 	&dev_attr_fnode_password.attr,
901 	&dev_attr_fnode_password_in.attr,
902 	&dev_attr_fnode_is_boot_target.attr,
903 	NULL,
904 };
905 
906 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
907 						    struct attribute *attr,
908 						    int i)
909 {
910 	struct device *dev = container_of(kobj, struct device, kobj);
911 	struct iscsi_bus_flash_session *fnode_sess =
912 						iscsi_dev_to_flash_session(dev);
913 	struct iscsi_transport *t = fnode_sess->transport;
914 	int param;
915 
916 	if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
917 		param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
918 	} else if (attr == &dev_attr_fnode_discovery_session.attr) {
919 		param = ISCSI_FLASHNODE_DISCOVERY_SESS;
920 	} else if (attr == &dev_attr_fnode_portal_type.attr) {
921 		param = ISCSI_FLASHNODE_PORTAL_TYPE;
922 	} else if (attr == &dev_attr_fnode_entry_enable.attr) {
923 		param = ISCSI_FLASHNODE_ENTRY_EN;
924 	} else if (attr == &dev_attr_fnode_immediate_data.attr) {
925 		param = ISCSI_FLASHNODE_IMM_DATA_EN;
926 	} else if (attr == &dev_attr_fnode_initial_r2t.attr) {
927 		param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
928 	} else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
929 		param = ISCSI_FLASHNODE_DATASEQ_INORDER;
930 	} else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
931 		param = ISCSI_FLASHNODE_PDU_INORDER;
932 	} else if (attr == &dev_attr_fnode_chap_auth.attr) {
933 		param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
934 	} else if (attr == &dev_attr_fnode_discovery_logout.attr) {
935 		param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
936 	} else if (attr == &dev_attr_fnode_bidi_chap.attr) {
937 		param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
938 	} else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
939 		param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
940 	} else if (attr == &dev_attr_fnode_erl.attr) {
941 		param = ISCSI_FLASHNODE_ERL;
942 	} else if (attr == &dev_attr_fnode_first_burst_len.attr) {
943 		param = ISCSI_FLASHNODE_FIRST_BURST;
944 	} else if (attr == &dev_attr_fnode_def_time2wait.attr) {
945 		param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
946 	} else if (attr == &dev_attr_fnode_def_time2retain.attr) {
947 		param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
948 	} else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
949 		param = ISCSI_FLASHNODE_MAX_R2T;
950 	} else if (attr == &dev_attr_fnode_isid.attr) {
951 		param = ISCSI_FLASHNODE_ISID;
952 	} else if (attr == &dev_attr_fnode_tsid.attr) {
953 		param = ISCSI_FLASHNODE_TSID;
954 	} else if (attr == &dev_attr_fnode_max_burst_len.attr) {
955 		param = ISCSI_FLASHNODE_MAX_BURST;
956 	} else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
957 		param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
958 	} else if (attr == &dev_attr_fnode_targetalias.attr) {
959 		param = ISCSI_FLASHNODE_ALIAS;
960 	} else if (attr == &dev_attr_fnode_targetname.attr) {
961 		param = ISCSI_FLASHNODE_NAME;
962 	} else if (attr == &dev_attr_fnode_tpgt.attr) {
963 		param = ISCSI_FLASHNODE_TPGT;
964 	} else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
965 		param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
966 	} else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
967 		param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
968 	} else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
969 		param = ISCSI_FLASHNODE_CHAP_IN_IDX;
970 	} else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
971 		param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
972 	} else if (attr == &dev_attr_fnode_username.attr) {
973 		param = ISCSI_FLASHNODE_USERNAME;
974 	} else if (attr == &dev_attr_fnode_username_in.attr) {
975 		param = ISCSI_FLASHNODE_USERNAME_IN;
976 	} else if (attr == &dev_attr_fnode_password.attr) {
977 		param = ISCSI_FLASHNODE_PASSWORD;
978 	} else if (attr == &dev_attr_fnode_password_in.attr) {
979 		param = ISCSI_FLASHNODE_PASSWORD_IN;
980 	} else if (attr == &dev_attr_fnode_is_boot_target.attr) {
981 		param = ISCSI_FLASHNODE_IS_BOOT_TGT;
982 	} else {
983 		WARN_ONCE(1, "Invalid flashnode session attr");
984 		return 0;
985 	}
986 
987 	return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
988 }
989 
990 static struct attribute_group iscsi_flashnode_sess_attr_group = {
991 	.attrs = iscsi_flashnode_sess_attrs,
992 	.is_visible = iscsi_flashnode_sess_attr_is_visible,
993 };
994 
995 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
996 	&iscsi_flashnode_sess_attr_group,
997 	NULL,
998 };
999 
1000 static void iscsi_flashnode_sess_release(struct device *dev)
1001 {
1002 	struct iscsi_bus_flash_session *fnode_sess =
1003 						iscsi_dev_to_flash_session(dev);
1004 
1005 	kfree(fnode_sess->targetname);
1006 	kfree(fnode_sess->targetalias);
1007 	kfree(fnode_sess->portal_type);
1008 	kfree(fnode_sess);
1009 }
1010 
1011 static const struct device_type iscsi_flashnode_sess_dev_type = {
1012 	.name = "iscsi_flashnode_sess_dev_type",
1013 	.groups = iscsi_flashnode_sess_attr_groups,
1014 	.release = iscsi_flashnode_sess_release,
1015 };
1016 
1017 /* flash node connection attrs show */
1018 #define iscsi_flashnode_conn_attr_show(type, name, param)		\
1019 static ssize_t								\
1020 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
1021 		     char *buf)						\
1022 {									\
1023 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1024 	struct iscsi_bus_flash_session *fnode_sess =			\
1025 				iscsi_flash_conn_to_flash_session(fnode_conn);\
1026 	struct iscsi_transport *t = fnode_conn->transport;		\
1027 	return t->get_flashnode_param(fnode_sess, param, buf);		\
1028 }									\
1029 
1030 
1031 #define iscsi_flashnode_conn_attr(type, name, param)			\
1032 	iscsi_flashnode_conn_attr_show(type, name, param)		\
1033 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,			\
1034 			    show_##type##_##name, NULL);
1035 
1036 /* Flash node connection attributes */
1037 
1038 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1039 			  ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1040 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1041 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1042 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1043 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1044 			  ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1045 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1046 			  ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1047 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1048 			  ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1049 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1050 			  ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1051 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1052 			  ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1053 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1054 			  ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1055 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1056 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1057 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1058 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1059 			  ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1060 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1061 			  ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1062 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1063 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1064 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1065 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1066 			  ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1067 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1068 			  ISCSI_FLASHNODE_REDIRECT_IPADDR);
1069 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1070 			  ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1071 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1072 			  ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1073 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1074 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1075 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1076 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1077 
1078 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1079 	&dev_attr_fnode_is_fw_assigned_ipv6.attr,
1080 	&dev_attr_fnode_header_digest.attr,
1081 	&dev_attr_fnode_data_digest.attr,
1082 	&dev_attr_fnode_snack_req.attr,
1083 	&dev_attr_fnode_tcp_timestamp_stat.attr,
1084 	&dev_attr_fnode_tcp_nagle_disable.attr,
1085 	&dev_attr_fnode_tcp_wsf_disable.attr,
1086 	&dev_attr_fnode_tcp_timer_scale.attr,
1087 	&dev_attr_fnode_tcp_timestamp_enable.attr,
1088 	&dev_attr_fnode_fragment_disable.attr,
1089 	&dev_attr_fnode_max_recv_dlength.attr,
1090 	&dev_attr_fnode_max_xmit_dlength.attr,
1091 	&dev_attr_fnode_keepalive_tmo.attr,
1092 	&dev_attr_fnode_port.attr,
1093 	&dev_attr_fnode_ipaddress.attr,
1094 	&dev_attr_fnode_redirect_ipaddr.attr,
1095 	&dev_attr_fnode_max_segment_size.attr,
1096 	&dev_attr_fnode_local_port.attr,
1097 	&dev_attr_fnode_ipv4_tos.attr,
1098 	&dev_attr_fnode_ipv6_traffic_class.attr,
1099 	&dev_attr_fnode_ipv6_flow_label.attr,
1100 	&dev_attr_fnode_link_local_ipv6.attr,
1101 	&dev_attr_fnode_tcp_xmit_wsf.attr,
1102 	&dev_attr_fnode_tcp_recv_wsf.attr,
1103 	&dev_attr_fnode_statsn.attr,
1104 	&dev_attr_fnode_exp_statsn.attr,
1105 	NULL,
1106 };
1107 
1108 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1109 						    struct attribute *attr,
1110 						    int i)
1111 {
1112 	struct device *dev = container_of(kobj, struct device, kobj);
1113 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1114 	struct iscsi_transport *t = fnode_conn->transport;
1115 	int param;
1116 
1117 	if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1118 		param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1119 	} else if (attr == &dev_attr_fnode_header_digest.attr) {
1120 		param = ISCSI_FLASHNODE_HDR_DGST_EN;
1121 	} else if (attr == &dev_attr_fnode_data_digest.attr) {
1122 		param = ISCSI_FLASHNODE_DATA_DGST_EN;
1123 	} else if (attr == &dev_attr_fnode_snack_req.attr) {
1124 		param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1125 	} else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1126 		param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1127 	} else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1128 		param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1129 	} else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1130 		param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1131 	} else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1132 		param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1133 	} else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1134 		param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1135 	} else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1136 		param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1137 	} else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1138 		param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1139 	} else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1140 		param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1141 	} else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1142 		param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1143 	} else if (attr == &dev_attr_fnode_port.attr) {
1144 		param = ISCSI_FLASHNODE_PORT;
1145 	} else if (attr == &dev_attr_fnode_ipaddress.attr) {
1146 		param = ISCSI_FLASHNODE_IPADDR;
1147 	} else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1148 		param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1149 	} else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1150 		param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1151 	} else if (attr == &dev_attr_fnode_local_port.attr) {
1152 		param = ISCSI_FLASHNODE_LOCAL_PORT;
1153 	} else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1154 		param = ISCSI_FLASHNODE_IPV4_TOS;
1155 	} else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1156 		param = ISCSI_FLASHNODE_IPV6_TC;
1157 	} else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1158 		param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1159 	} else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1160 		param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1161 	} else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1162 		param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1163 	} else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1164 		param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1165 	} else if (attr == &dev_attr_fnode_statsn.attr) {
1166 		param = ISCSI_FLASHNODE_STATSN;
1167 	} else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1168 		param = ISCSI_FLASHNODE_EXP_STATSN;
1169 	} else {
1170 		WARN_ONCE(1, "Invalid flashnode connection attr");
1171 		return 0;
1172 	}
1173 
1174 	return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1175 }
1176 
1177 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1178 	.attrs = iscsi_flashnode_conn_attrs,
1179 	.is_visible = iscsi_flashnode_conn_attr_is_visible,
1180 };
1181 
1182 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1183 	&iscsi_flashnode_conn_attr_group,
1184 	NULL,
1185 };
1186 
1187 static void iscsi_flashnode_conn_release(struct device *dev)
1188 {
1189 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1190 
1191 	kfree(fnode_conn->ipaddress);
1192 	kfree(fnode_conn->redirect_ipaddr);
1193 	kfree(fnode_conn->link_local_ipv6_addr);
1194 	kfree(fnode_conn);
1195 }
1196 
1197 static const struct device_type iscsi_flashnode_conn_dev_type = {
1198 	.name = "iscsi_flashnode_conn_dev_type",
1199 	.groups = iscsi_flashnode_conn_attr_groups,
1200 	.release = iscsi_flashnode_conn_release,
1201 };
1202 
1203 static struct bus_type iscsi_flashnode_bus;
1204 
1205 int iscsi_flashnode_bus_match(struct device *dev,
1206 				     struct device_driver *drv)
1207 {
1208 	if (dev->bus == &iscsi_flashnode_bus)
1209 		return 1;
1210 	return 0;
1211 }
1212 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1213 
1214 static struct bus_type iscsi_flashnode_bus = {
1215 	.name = "iscsi_flashnode",
1216 	.match = &iscsi_flashnode_bus_match,
1217 };
1218 
1219 /**
1220  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1221  * @shost: pointer to host data
1222  * @index: index of flashnode to add in sysfs
1223  * @transport: pointer to transport data
1224  * @dd_size: total size to allocate
1225  *
1226  * Adds a sysfs entry for the flashnode session attributes
1227  *
1228  * Returns:
1229  *  pointer to allocated flashnode sess on success
1230  *  %NULL on failure
1231  */
1232 struct iscsi_bus_flash_session *
1233 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1234 			    struct iscsi_transport *transport,
1235 			    int dd_size)
1236 {
1237 	struct iscsi_bus_flash_session *fnode_sess;
1238 	int err;
1239 
1240 	fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1241 	if (!fnode_sess)
1242 		return NULL;
1243 
1244 	fnode_sess->transport = transport;
1245 	fnode_sess->target_id = index;
1246 	fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1247 	fnode_sess->dev.bus = &iscsi_flashnode_bus;
1248 	fnode_sess->dev.parent = &shost->shost_gendev;
1249 	dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1250 		     shost->host_no, index);
1251 
1252 	err = device_register(&fnode_sess->dev);
1253 	if (err)
1254 		goto free_fnode_sess;
1255 
1256 	if (dd_size)
1257 		fnode_sess->dd_data = &fnode_sess[1];
1258 
1259 	return fnode_sess;
1260 
1261 free_fnode_sess:
1262 	kfree(fnode_sess);
1263 	return NULL;
1264 }
1265 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1266 
1267 /**
1268  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1269  * @shost: pointer to host data
1270  * @fnode_sess: pointer to the parent flashnode session entry
1271  * @transport: pointer to transport data
1272  * @dd_size: total size to allocate
1273  *
1274  * Adds a sysfs entry for the flashnode connection attributes
1275  *
1276  * Returns:
1277  *  pointer to allocated flashnode conn on success
1278  *  %NULL on failure
1279  */
1280 struct iscsi_bus_flash_conn *
1281 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1282 			    struct iscsi_bus_flash_session *fnode_sess,
1283 			    struct iscsi_transport *transport,
1284 			    int dd_size)
1285 {
1286 	struct iscsi_bus_flash_conn *fnode_conn;
1287 	int err;
1288 
1289 	fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1290 	if (!fnode_conn)
1291 		return NULL;
1292 
1293 	fnode_conn->transport = transport;
1294 	fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1295 	fnode_conn->dev.bus = &iscsi_flashnode_bus;
1296 	fnode_conn->dev.parent = &fnode_sess->dev;
1297 	dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1298 		     shost->host_no, fnode_sess->target_id);
1299 
1300 	err = device_register(&fnode_conn->dev);
1301 	if (err)
1302 		goto free_fnode_conn;
1303 
1304 	if (dd_size)
1305 		fnode_conn->dd_data = &fnode_conn[1];
1306 
1307 	return fnode_conn;
1308 
1309 free_fnode_conn:
1310 	kfree(fnode_conn);
1311 	return NULL;
1312 }
1313 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1314 
1315 /**
1316  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1317  * @dev: device to verify
1318  * @data: pointer to data containing value to use for verification
1319  *
1320  * Verifies if the passed device is flashnode conn device
1321  *
1322  * Returns:
1323  *  1 on success
1324  *  0 on failure
1325  */
1326 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1327 {
1328 	return dev->bus == &iscsi_flashnode_bus;
1329 }
1330 
1331 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1332 {
1333 	device_unregister(&fnode_conn->dev);
1334 	return 0;
1335 }
1336 
1337 static int flashnode_match_index(struct device *dev, void *data)
1338 {
1339 	struct iscsi_bus_flash_session *fnode_sess = NULL;
1340 	int ret = 0;
1341 
1342 	if (!iscsi_flashnode_bus_match(dev, NULL))
1343 		goto exit_match_index;
1344 
1345 	fnode_sess = iscsi_dev_to_flash_session(dev);
1346 	ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1347 
1348 exit_match_index:
1349 	return ret;
1350 }
1351 
1352 /**
1353  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1354  * @shost: pointer to host data
1355  * @idx: index to match
1356  *
1357  * Finds the flashnode session object for the passed index
1358  *
1359  * Returns:
1360  *  pointer to found flashnode session object on success
1361  *  %NULL on failure
1362  */
1363 static struct iscsi_bus_flash_session *
1364 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1365 {
1366 	struct iscsi_bus_flash_session *fnode_sess = NULL;
1367 	struct device *dev;
1368 
1369 	dev = device_find_child(&shost->shost_gendev, &idx,
1370 				flashnode_match_index);
1371 	if (dev)
1372 		fnode_sess = iscsi_dev_to_flash_session(dev);
1373 
1374 	return fnode_sess;
1375 }
1376 
1377 /**
1378  * iscsi_find_flashnode_sess - finds flashnode session entry
1379  * @shost: pointer to host data
1380  * @data: pointer to data containing value to use for comparison
1381  * @fn: function pointer that does actual comparison
1382  *
1383  * Finds the flashnode session object comparing the data passed using logic
1384  * defined in passed function pointer
1385  *
1386  * Returns:
1387  *  pointer to found flashnode session device object on success
1388  *  %NULL on failure
1389  */
1390 struct device *
1391 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1392 			  int (*fn)(struct device *dev, void *data))
1393 {
1394 	return device_find_child(&shost->shost_gendev, data, fn);
1395 }
1396 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1397 
1398 /**
1399  * iscsi_find_flashnode_conn - finds flashnode connection entry
1400  * @fnode_sess: pointer to parent flashnode session entry
1401  *
1402  * Finds the flashnode connection object comparing the data passed using logic
1403  * defined in passed function pointer
1404  *
1405  * Returns:
1406  *  pointer to found flashnode connection device object on success
1407  *  %NULL on failure
1408  */
1409 struct device *
1410 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1411 {
1412 	return device_find_child(&fnode_sess->dev, NULL,
1413 				 iscsi_is_flashnode_conn_dev);
1414 }
1415 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1416 
1417 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1418 {
1419 	if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1420 		return 0;
1421 
1422 	return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1423 }
1424 
1425 /**
1426  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1427  * @fnode_sess: pointer to flashnode session entry to be destroyed
1428  *
1429  * Deletes the flashnode session entry and all children flashnode connection
1430  * entries from sysfs
1431  */
1432 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1433 {
1434 	int err;
1435 
1436 	err = device_for_each_child(&fnode_sess->dev, NULL,
1437 				    iscsi_iter_destroy_flashnode_conn_fn);
1438 	if (err)
1439 		pr_err("Could not delete all connections for %s. Error %d.\n",
1440 		       fnode_sess->dev.kobj.name, err);
1441 
1442 	device_unregister(&fnode_sess->dev);
1443 }
1444 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1445 
1446 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1447 {
1448 	if (!iscsi_flashnode_bus_match(dev, NULL))
1449 		return 0;
1450 
1451 	iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1452 	return 0;
1453 }
1454 
1455 /**
1456  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1457  * @shost: pointer to host data
1458  *
1459  * Destroys all the flashnode session entries and all corresponding children
1460  * flashnode connection entries from sysfs
1461  */
1462 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1463 {
1464 	device_for_each_child(&shost->shost_gendev, NULL,
1465 			      iscsi_iter_destroy_flashnode_fn);
1466 }
1467 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1468 
1469 /*
1470  * BSG support
1471  */
1472 /**
1473  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1474  * @job: bsg job to be processed
1475  */
1476 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1477 {
1478 	struct Scsi_Host *shost = iscsi_job_to_shost(job);
1479 	struct iscsi_bsg_request *req = job->request;
1480 	struct iscsi_bsg_reply *reply = job->reply;
1481 	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1482 	int cmdlen = sizeof(uint32_t);	/* start with length of msgcode */
1483 	int ret;
1484 
1485 	/* check if we have the msgcode value at least */
1486 	if (job->request_len < sizeof(uint32_t)) {
1487 		ret = -ENOMSG;
1488 		goto fail_host_msg;
1489 	}
1490 
1491 	/* Validate the host command */
1492 	switch (req->msgcode) {
1493 	case ISCSI_BSG_HST_VENDOR:
1494 		cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1495 		if ((shost->hostt->vendor_id == 0L) ||
1496 		    (req->rqst_data.h_vendor.vendor_id !=
1497 			shost->hostt->vendor_id)) {
1498 			ret = -ESRCH;
1499 			goto fail_host_msg;
1500 		}
1501 		break;
1502 	default:
1503 		ret = -EBADR;
1504 		goto fail_host_msg;
1505 	}
1506 
1507 	/* check if we really have all the request data needed */
1508 	if (job->request_len < cmdlen) {
1509 		ret = -ENOMSG;
1510 		goto fail_host_msg;
1511 	}
1512 
1513 	ret = i->iscsi_transport->bsg_request(job);
1514 	if (!ret)
1515 		return 0;
1516 
1517 fail_host_msg:
1518 	/* return the errno failure code as the only status */
1519 	BUG_ON(job->reply_len < sizeof(uint32_t));
1520 	reply->reply_payload_rcv_len = 0;
1521 	reply->result = ret;
1522 	job->reply_len = sizeof(uint32_t);
1523 	bsg_job_done(job, ret, 0);
1524 	return 0;
1525 }
1526 
1527 /**
1528  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1529  * @shost: shost for iscsi_host
1530  * @ihost: iscsi_cls_host adding the structures to
1531  */
1532 static int
1533 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1534 {
1535 	struct device *dev = &shost->shost_gendev;
1536 	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1537 	struct request_queue *q;
1538 	char bsg_name[20];
1539 
1540 	if (!i->iscsi_transport->bsg_request)
1541 		return -ENOTSUPP;
1542 
1543 	snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1544 	q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1545 	if (IS_ERR(q)) {
1546 		shost_printk(KERN_ERR, shost, "bsg interface failed to "
1547 			     "initialize - no request queue\n");
1548 		return PTR_ERR(q);
1549 	}
1550 	__scsi_init_queue(shost, q);
1551 
1552 	ihost->bsg_q = q;
1553 	return 0;
1554 }
1555 
1556 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1557 			    struct device *cdev)
1558 {
1559 	struct Scsi_Host *shost = dev_to_shost(dev);
1560 	struct iscsi_cls_host *ihost = shost->shost_data;
1561 
1562 	memset(ihost, 0, sizeof(*ihost));
1563 	mutex_init(&ihost->mutex);
1564 
1565 	iscsi_bsg_host_add(shost, ihost);
1566 	/* ignore any bsg add error - we just can't do sgio */
1567 
1568 	return 0;
1569 }
1570 
1571 static int iscsi_remove_host(struct transport_container *tc,
1572 			     struct device *dev, struct device *cdev)
1573 {
1574 	struct Scsi_Host *shost = dev_to_shost(dev);
1575 	struct iscsi_cls_host *ihost = shost->shost_data;
1576 
1577 	bsg_remove_queue(ihost->bsg_q);
1578 	return 0;
1579 }
1580 
1581 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1582 			       "iscsi_host",
1583 			       iscsi_setup_host,
1584 			       iscsi_remove_host,
1585 			       NULL);
1586 
1587 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1588 			       "iscsi_session",
1589 			       NULL,
1590 			       NULL,
1591 			       NULL);
1592 
1593 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1594 			       "iscsi_connection",
1595 			       NULL,
1596 			       NULL,
1597 			       NULL);
1598 
1599 static struct sock *nls;
1600 static DEFINE_MUTEX(rx_queue_mutex);
1601 
1602 static LIST_HEAD(sesslist);
1603 static DEFINE_SPINLOCK(sesslock);
1604 static LIST_HEAD(connlist);
1605 static LIST_HEAD(connlist_err);
1606 static DEFINE_SPINLOCK(connlock);
1607 
1608 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1609 {
1610 	struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1611 	return sess->sid;
1612 }
1613 
1614 /*
1615  * Returns the matching session to a given sid
1616  */
1617 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1618 {
1619 	unsigned long flags;
1620 	struct iscsi_cls_session *sess;
1621 
1622 	spin_lock_irqsave(&sesslock, flags);
1623 	list_for_each_entry(sess, &sesslist, sess_list) {
1624 		if (sess->sid == sid) {
1625 			spin_unlock_irqrestore(&sesslock, flags);
1626 			return sess;
1627 		}
1628 	}
1629 	spin_unlock_irqrestore(&sesslock, flags);
1630 	return NULL;
1631 }
1632 
1633 /*
1634  * Returns the matching connection to a given sid / cid tuple
1635  */
1636 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1637 {
1638 	unsigned long flags;
1639 	struct iscsi_cls_conn *conn;
1640 
1641 	spin_lock_irqsave(&connlock, flags);
1642 	list_for_each_entry(conn, &connlist, conn_list) {
1643 		if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1644 			spin_unlock_irqrestore(&connlock, flags);
1645 			return conn;
1646 		}
1647 	}
1648 	spin_unlock_irqrestore(&connlock, flags);
1649 	return NULL;
1650 }
1651 
1652 /*
1653  * The following functions can be used by LLDs that allocate
1654  * their own scsi_hosts or by software iscsi LLDs
1655  */
1656 static struct {
1657 	int value;
1658 	char *name;
1659 } iscsi_session_state_names[] = {
1660 	{ ISCSI_SESSION_LOGGED_IN,	"LOGGED_IN" },
1661 	{ ISCSI_SESSION_FAILED,		"FAILED" },
1662 	{ ISCSI_SESSION_FREE,		"FREE" },
1663 };
1664 
1665 static const char *iscsi_session_state_name(int state)
1666 {
1667 	int i;
1668 	char *name = NULL;
1669 
1670 	for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1671 		if (iscsi_session_state_names[i].value == state) {
1672 			name = iscsi_session_state_names[i].name;
1673 			break;
1674 		}
1675 	}
1676 	return name;
1677 }
1678 
1679 int iscsi_session_chkready(struct iscsi_cls_session *session)
1680 {
1681 	int err;
1682 
1683 	switch (session->state) {
1684 	case ISCSI_SESSION_LOGGED_IN:
1685 		err = 0;
1686 		break;
1687 	case ISCSI_SESSION_FAILED:
1688 		err = DID_IMM_RETRY << 16;
1689 		break;
1690 	case ISCSI_SESSION_FREE:
1691 		err = DID_TRANSPORT_FAILFAST << 16;
1692 		break;
1693 	default:
1694 		err = DID_NO_CONNECT << 16;
1695 		break;
1696 	}
1697 	return err;
1698 }
1699 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1700 
1701 int iscsi_is_session_online(struct iscsi_cls_session *session)
1702 {
1703 	unsigned long flags;
1704 	int ret = 0;
1705 
1706 	spin_lock_irqsave(&session->lock, flags);
1707 	if (session->state == ISCSI_SESSION_LOGGED_IN)
1708 		ret = 1;
1709 	spin_unlock_irqrestore(&session->lock, flags);
1710 	return ret;
1711 }
1712 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1713 
1714 static void iscsi_session_release(struct device *dev)
1715 {
1716 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1717 	struct Scsi_Host *shost;
1718 
1719 	shost = iscsi_session_to_shost(session);
1720 	scsi_host_put(shost);
1721 	ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1722 	kfree(session);
1723 }
1724 
1725 int iscsi_is_session_dev(const struct device *dev)
1726 {
1727 	return dev->release == iscsi_session_release;
1728 }
1729 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1730 
1731 static int iscsi_iter_session_fn(struct device *dev, void *data)
1732 {
1733 	void (* fn) (struct iscsi_cls_session *) = data;
1734 
1735 	if (!iscsi_is_session_dev(dev))
1736 		return 0;
1737 	fn(iscsi_dev_to_session(dev));
1738 	return 0;
1739 }
1740 
1741 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1742 				 void (*fn)(struct iscsi_cls_session *))
1743 {
1744 	device_for_each_child(&shost->shost_gendev, fn,
1745 			      iscsi_iter_session_fn);
1746 }
1747 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1748 
1749 struct iscsi_scan_data {
1750 	unsigned int channel;
1751 	unsigned int id;
1752 	u64 lun;
1753 	enum scsi_scan_mode rescan;
1754 };
1755 
1756 static int iscsi_user_scan_session(struct device *dev, void *data)
1757 {
1758 	struct iscsi_scan_data *scan_data = data;
1759 	struct iscsi_cls_session *session;
1760 	struct Scsi_Host *shost;
1761 	struct iscsi_cls_host *ihost;
1762 	unsigned long flags;
1763 	unsigned int id;
1764 
1765 	if (!iscsi_is_session_dev(dev))
1766 		return 0;
1767 
1768 	session = iscsi_dev_to_session(dev);
1769 
1770 	ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1771 
1772 	shost = iscsi_session_to_shost(session);
1773 	ihost = shost->shost_data;
1774 
1775 	mutex_lock(&ihost->mutex);
1776 	spin_lock_irqsave(&session->lock, flags);
1777 	if (session->state != ISCSI_SESSION_LOGGED_IN) {
1778 		spin_unlock_irqrestore(&session->lock, flags);
1779 		goto user_scan_exit;
1780 	}
1781 	id = session->target_id;
1782 	spin_unlock_irqrestore(&session->lock, flags);
1783 
1784 	if (id != ISCSI_MAX_TARGET) {
1785 		if ((scan_data->channel == SCAN_WILD_CARD ||
1786 		     scan_data->channel == 0) &&
1787 		    (scan_data->id == SCAN_WILD_CARD ||
1788 		     scan_data->id == id))
1789 			scsi_scan_target(&session->dev, 0, id,
1790 					 scan_data->lun, scan_data->rescan);
1791 	}
1792 
1793 user_scan_exit:
1794 	mutex_unlock(&ihost->mutex);
1795 	ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1796 	return 0;
1797 }
1798 
1799 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1800 			   uint id, u64 lun)
1801 {
1802 	struct iscsi_scan_data scan_data;
1803 
1804 	scan_data.channel = channel;
1805 	scan_data.id = id;
1806 	scan_data.lun = lun;
1807 	scan_data.rescan = SCSI_SCAN_MANUAL;
1808 
1809 	return device_for_each_child(&shost->shost_gendev, &scan_data,
1810 				     iscsi_user_scan_session);
1811 }
1812 
1813 static void iscsi_scan_session(struct work_struct *work)
1814 {
1815 	struct iscsi_cls_session *session =
1816 			container_of(work, struct iscsi_cls_session, scan_work);
1817 	struct iscsi_scan_data scan_data;
1818 
1819 	scan_data.channel = 0;
1820 	scan_data.id = SCAN_WILD_CARD;
1821 	scan_data.lun = SCAN_WILD_CARD;
1822 	scan_data.rescan = SCSI_SCAN_RESCAN;
1823 
1824 	iscsi_user_scan_session(&session->dev, &scan_data);
1825 }
1826 
1827 /**
1828  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1829  * @cmd: scsi cmd passed to scsi eh handler
1830  *
1831  * If the session is down this function will wait for the recovery
1832  * timer to fire or for the session to be logged back in. If the
1833  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1834  * should pass this error value to the scsi eh.
1835  */
1836 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1837 {
1838 	struct iscsi_cls_session *session =
1839 			starget_to_session(scsi_target(cmd->device));
1840 	unsigned long flags;
1841 	int ret = 0;
1842 
1843 	spin_lock_irqsave(&session->lock, flags);
1844 	while (session->state != ISCSI_SESSION_LOGGED_IN) {
1845 		if (session->state == ISCSI_SESSION_FREE) {
1846 			ret = FAST_IO_FAIL;
1847 			break;
1848 		}
1849 		spin_unlock_irqrestore(&session->lock, flags);
1850 		msleep(1000);
1851 		spin_lock_irqsave(&session->lock, flags);
1852 	}
1853 	spin_unlock_irqrestore(&session->lock, flags);
1854 	return ret;
1855 }
1856 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1857 
1858 static void session_recovery_timedout(struct work_struct *work)
1859 {
1860 	struct iscsi_cls_session *session =
1861 		container_of(work, struct iscsi_cls_session,
1862 			     recovery_work.work);
1863 	unsigned long flags;
1864 
1865 	iscsi_cls_session_printk(KERN_INFO, session,
1866 				 "session recovery timed out after %d secs\n",
1867 				 session->recovery_tmo);
1868 
1869 	spin_lock_irqsave(&session->lock, flags);
1870 	switch (session->state) {
1871 	case ISCSI_SESSION_FAILED:
1872 		session->state = ISCSI_SESSION_FREE;
1873 		break;
1874 	case ISCSI_SESSION_LOGGED_IN:
1875 	case ISCSI_SESSION_FREE:
1876 		/* we raced with the unblock's flush */
1877 		spin_unlock_irqrestore(&session->lock, flags);
1878 		return;
1879 	}
1880 	spin_unlock_irqrestore(&session->lock, flags);
1881 
1882 	ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1883 	scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1884 	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1885 
1886 	if (session->transport->session_recovery_timedout)
1887 		session->transport->session_recovery_timedout(session);
1888 }
1889 
1890 static void __iscsi_unblock_session(struct work_struct *work)
1891 {
1892 	struct iscsi_cls_session *session =
1893 			container_of(work, struct iscsi_cls_session,
1894 				     unblock_work);
1895 	unsigned long flags;
1896 
1897 	ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1898 
1899 	cancel_delayed_work_sync(&session->recovery_work);
1900 	spin_lock_irqsave(&session->lock, flags);
1901 	session->state = ISCSI_SESSION_LOGGED_IN;
1902 	spin_unlock_irqrestore(&session->lock, flags);
1903 	/* start IO */
1904 	scsi_target_unblock(&session->dev, SDEV_RUNNING);
1905 	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1906 }
1907 
1908 /**
1909  * iscsi_unblock_session - set a session as logged in and start IO.
1910  * @session: iscsi session
1911  *
1912  * Mark a session as ready to accept IO.
1913  */
1914 void iscsi_unblock_session(struct iscsi_cls_session *session)
1915 {
1916 	if (!cancel_work_sync(&session->block_work))
1917 		cancel_delayed_work_sync(&session->recovery_work);
1918 
1919 	queue_work(session->workq, &session->unblock_work);
1920 	/*
1921 	 * Blocking the session can be done from any context so we only
1922 	 * queue the block work. Make sure the unblock work has completed
1923 	 * because it flushes/cancels the other works and updates the state.
1924 	 */
1925 	flush_work(&session->unblock_work);
1926 }
1927 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1928 
1929 static void __iscsi_block_session(struct work_struct *work)
1930 {
1931 	struct iscsi_cls_session *session =
1932 			container_of(work, struct iscsi_cls_session,
1933 				     block_work);
1934 	unsigned long flags;
1935 
1936 	ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1937 	spin_lock_irqsave(&session->lock, flags);
1938 	session->state = ISCSI_SESSION_FAILED;
1939 	spin_unlock_irqrestore(&session->lock, flags);
1940 	scsi_target_block(&session->dev);
1941 	ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1942 	if (session->recovery_tmo >= 0)
1943 		queue_delayed_work(session->workq,
1944 				   &session->recovery_work,
1945 				   session->recovery_tmo * HZ);
1946 }
1947 
1948 void iscsi_block_session(struct iscsi_cls_session *session)
1949 {
1950 	queue_work(session->workq, &session->block_work);
1951 }
1952 EXPORT_SYMBOL_GPL(iscsi_block_session);
1953 
1954 static void __iscsi_unbind_session(struct work_struct *work)
1955 {
1956 	struct iscsi_cls_session *session =
1957 			container_of(work, struct iscsi_cls_session,
1958 				     unbind_work);
1959 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
1960 	struct iscsi_cls_host *ihost = shost->shost_data;
1961 	unsigned long flags;
1962 	unsigned int target_id;
1963 
1964 	ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
1965 
1966 	/* Prevent new scans and make sure scanning is not in progress */
1967 	mutex_lock(&ihost->mutex);
1968 	spin_lock_irqsave(&session->lock, flags);
1969 	if (session->target_id == ISCSI_MAX_TARGET) {
1970 		spin_unlock_irqrestore(&session->lock, flags);
1971 		mutex_unlock(&ihost->mutex);
1972 		goto unbind_session_exit;
1973 	}
1974 
1975 	target_id = session->target_id;
1976 	session->target_id = ISCSI_MAX_TARGET;
1977 	spin_unlock_irqrestore(&session->lock, flags);
1978 	mutex_unlock(&ihost->mutex);
1979 
1980 	scsi_remove_target(&session->dev);
1981 
1982 	if (session->ida_used)
1983 		ida_free(&iscsi_sess_ida, target_id);
1984 
1985 unbind_session_exit:
1986 	iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
1987 	ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
1988 }
1989 
1990 static void __iscsi_destroy_session(struct work_struct *work)
1991 {
1992 	struct iscsi_cls_session *session =
1993 		container_of(work, struct iscsi_cls_session, destroy_work);
1994 
1995 	session->transport->destroy_session(session);
1996 }
1997 
1998 struct iscsi_cls_session *
1999 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2000 		    int dd_size)
2001 {
2002 	struct iscsi_cls_session *session;
2003 
2004 	session = kzalloc(sizeof(*session) + dd_size,
2005 			  GFP_KERNEL);
2006 	if (!session)
2007 		return NULL;
2008 
2009 	session->transport = transport;
2010 	session->creator = -1;
2011 	session->recovery_tmo = 120;
2012 	session->recovery_tmo_sysfs_override = false;
2013 	session->state = ISCSI_SESSION_FREE;
2014 	INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2015 	INIT_LIST_HEAD(&session->sess_list);
2016 	INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2017 	INIT_WORK(&session->block_work, __iscsi_block_session);
2018 	INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2019 	INIT_WORK(&session->scan_work, iscsi_scan_session);
2020 	INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2021 	spin_lock_init(&session->lock);
2022 
2023 	/* this is released in the dev's release function */
2024 	scsi_host_get(shost);
2025 	session->dev.parent = &shost->shost_gendev;
2026 	session->dev.release = iscsi_session_release;
2027 	device_initialize(&session->dev);
2028 	if (dd_size)
2029 		session->dd_data = &session[1];
2030 
2031 	ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2032 	return session;
2033 }
2034 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2035 
2036 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2037 {
2038 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
2039 	unsigned long flags;
2040 	int id = 0;
2041 	int err;
2042 
2043 	session->sid = atomic_add_return(1, &iscsi_session_nr);
2044 
2045 	session->workq = alloc_workqueue("iscsi_ctrl_%d:%d",
2046 			WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
2047 			shost->host_no, session->sid);
2048 	if (!session->workq)
2049 		return -ENOMEM;
2050 
2051 	if (target_id == ISCSI_MAX_TARGET) {
2052 		id = ida_alloc(&iscsi_sess_ida, GFP_KERNEL);
2053 
2054 		if (id < 0) {
2055 			iscsi_cls_session_printk(KERN_ERR, session,
2056 					"Failure in Target ID Allocation\n");
2057 			err = id;
2058 			goto destroy_wq;
2059 		}
2060 		session->target_id = (unsigned int)id;
2061 		session->ida_used = true;
2062 	} else
2063 		session->target_id = target_id;
2064 
2065 	dev_set_name(&session->dev, "session%u", session->sid);
2066 	err = device_add(&session->dev);
2067 	if (err) {
2068 		iscsi_cls_session_printk(KERN_ERR, session,
2069 					 "could not register session's dev\n");
2070 		goto release_ida;
2071 	}
2072 	err = transport_register_device(&session->dev);
2073 	if (err) {
2074 		iscsi_cls_session_printk(KERN_ERR, session,
2075 					 "could not register transport's dev\n");
2076 		goto release_dev;
2077 	}
2078 
2079 	spin_lock_irqsave(&sesslock, flags);
2080 	list_add(&session->sess_list, &sesslist);
2081 	spin_unlock_irqrestore(&sesslock, flags);
2082 
2083 	iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2084 	ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2085 	return 0;
2086 
2087 release_dev:
2088 	device_del(&session->dev);
2089 release_ida:
2090 	if (session->ida_used)
2091 		ida_free(&iscsi_sess_ida, session->target_id);
2092 destroy_wq:
2093 	destroy_workqueue(session->workq);
2094 	return err;
2095 }
2096 EXPORT_SYMBOL_GPL(iscsi_add_session);
2097 
2098 /**
2099  * iscsi_create_session - create iscsi class session
2100  * @shost: scsi host
2101  * @transport: iscsi transport
2102  * @dd_size: private driver data size
2103  * @target_id: which target
2104  *
2105  * This can be called from a LLD or iscsi_transport.
2106  */
2107 struct iscsi_cls_session *
2108 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2109 		     int dd_size, unsigned int target_id)
2110 {
2111 	struct iscsi_cls_session *session;
2112 
2113 	session = iscsi_alloc_session(shost, transport, dd_size);
2114 	if (!session)
2115 		return NULL;
2116 
2117 	if (iscsi_add_session(session, target_id)) {
2118 		iscsi_free_session(session);
2119 		return NULL;
2120 	}
2121 	return session;
2122 }
2123 EXPORT_SYMBOL_GPL(iscsi_create_session);
2124 
2125 static void iscsi_conn_release(struct device *dev)
2126 {
2127 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2128 	struct device *parent = conn->dev.parent;
2129 
2130 	ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2131 	kfree(conn);
2132 	put_device(parent);
2133 }
2134 
2135 static int iscsi_is_conn_dev(const struct device *dev)
2136 {
2137 	return dev->release == iscsi_conn_release;
2138 }
2139 
2140 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2141 {
2142 	if (!iscsi_is_conn_dev(dev))
2143 		return 0;
2144 
2145 	iscsi_remove_conn(iscsi_dev_to_conn(dev));
2146 	return 0;
2147 }
2148 
2149 void iscsi_remove_session(struct iscsi_cls_session *session)
2150 {
2151 	unsigned long flags;
2152 	int err;
2153 
2154 	ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2155 
2156 	spin_lock_irqsave(&sesslock, flags);
2157 	if (!list_empty(&session->sess_list))
2158 		list_del(&session->sess_list);
2159 	spin_unlock_irqrestore(&sesslock, flags);
2160 
2161 	if (!cancel_work_sync(&session->block_work))
2162 		cancel_delayed_work_sync(&session->recovery_work);
2163 	cancel_work_sync(&session->unblock_work);
2164 	/*
2165 	 * If we are blocked let commands flow again. The lld or iscsi
2166 	 * layer should set up the queuecommand to fail commands.
2167 	 * We assume that LLD will not be calling block/unblock while
2168 	 * removing the session.
2169 	 */
2170 	spin_lock_irqsave(&session->lock, flags);
2171 	session->state = ISCSI_SESSION_FREE;
2172 	spin_unlock_irqrestore(&session->lock, flags);
2173 
2174 	scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2175 	/*
2176 	 * qla4xxx can perform it's own scans when it runs in kernel only
2177 	 * mode. Make sure to flush those scans.
2178 	 */
2179 	flush_work(&session->scan_work);
2180 	/* flush running unbind operations */
2181 	flush_work(&session->unbind_work);
2182 	__iscsi_unbind_session(&session->unbind_work);
2183 
2184 	/* hw iscsi may not have removed all connections from session */
2185 	err = device_for_each_child(&session->dev, NULL,
2186 				    iscsi_iter_destroy_conn_fn);
2187 	if (err)
2188 		iscsi_cls_session_printk(KERN_ERR, session,
2189 					 "Could not delete all connections "
2190 					 "for session. Error %d.\n", err);
2191 
2192 	transport_unregister_device(&session->dev);
2193 
2194 	destroy_workqueue(session->workq);
2195 
2196 	ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2197 	device_del(&session->dev);
2198 }
2199 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2200 
2201 static void iscsi_stop_conn(struct iscsi_cls_conn *conn, int flag)
2202 {
2203 	ISCSI_DBG_TRANS_CONN(conn, "Stopping conn.\n");
2204 
2205 	switch (flag) {
2206 	case STOP_CONN_RECOVER:
2207 		WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2208 		break;
2209 	case STOP_CONN_TERM:
2210 		WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2211 		break;
2212 	default:
2213 		iscsi_cls_conn_printk(KERN_ERR, conn, "invalid stop flag %d\n",
2214 				      flag);
2215 		return;
2216 	}
2217 
2218 	conn->transport->stop_conn(conn, flag);
2219 	ISCSI_DBG_TRANS_CONN(conn, "Stopping conn done.\n");
2220 }
2221 
2222 static void iscsi_ep_disconnect(struct iscsi_cls_conn *conn, bool is_active)
2223 {
2224 	struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2225 	struct iscsi_endpoint *ep;
2226 
2227 	ISCSI_DBG_TRANS_CONN(conn, "disconnect ep.\n");
2228 	WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2229 
2230 	if (!conn->ep || !session->transport->ep_disconnect)
2231 		return;
2232 
2233 	ep = conn->ep;
2234 	conn->ep = NULL;
2235 
2236 	session->transport->unbind_conn(conn, is_active);
2237 	session->transport->ep_disconnect(ep);
2238 	ISCSI_DBG_TRANS_CONN(conn, "disconnect ep done.\n");
2239 }
2240 
2241 static void iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn *conn,
2242 					 struct iscsi_endpoint *ep,
2243 					 bool is_active)
2244 {
2245 	/* Check if this was a conn error and the kernel took ownership */
2246 	spin_lock_irq(&conn->lock);
2247 	if (!test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2248 		spin_unlock_irq(&conn->lock);
2249 		iscsi_ep_disconnect(conn, is_active);
2250 	} else {
2251 		spin_unlock_irq(&conn->lock);
2252 		ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
2253 		mutex_unlock(&conn->ep_mutex);
2254 
2255 		flush_work(&conn->cleanup_work);
2256 		/*
2257 		 * Userspace is now done with the EP so we can release the ref
2258 		 * iscsi_cleanup_conn_work_fn took.
2259 		 */
2260 		iscsi_put_endpoint(ep);
2261 		mutex_lock(&conn->ep_mutex);
2262 	}
2263 }
2264 
2265 static int iscsi_if_stop_conn(struct iscsi_cls_conn *conn, int flag)
2266 {
2267 	ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop.\n");
2268 	/*
2269 	 * For offload, iscsid may not know about the ep like when iscsid is
2270 	 * restarted or for kernel based session shutdown iscsid is not even
2271 	 * up. For these cases, we do the disconnect now.
2272 	 */
2273 	mutex_lock(&conn->ep_mutex);
2274 	if (conn->ep)
2275 		iscsi_if_disconnect_bound_ep(conn, conn->ep, true);
2276 	mutex_unlock(&conn->ep_mutex);
2277 
2278 	/*
2279 	 * If this is a termination we have to call stop_conn with that flag
2280 	 * so the correct states get set. If we haven't run the work yet try to
2281 	 * avoid the extra run.
2282 	 */
2283 	if (flag == STOP_CONN_TERM) {
2284 		cancel_work_sync(&conn->cleanup_work);
2285 		iscsi_stop_conn(conn, flag);
2286 	} else {
2287 		/*
2288 		 * Figure out if it was the kernel or userspace initiating this.
2289 		 */
2290 		spin_lock_irq(&conn->lock);
2291 		if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2292 			spin_unlock_irq(&conn->lock);
2293 			iscsi_stop_conn(conn, flag);
2294 		} else {
2295 			spin_unlock_irq(&conn->lock);
2296 			ISCSI_DBG_TRANS_CONN(conn,
2297 					     "flush kernel conn cleanup.\n");
2298 			flush_work(&conn->cleanup_work);
2299 		}
2300 		/*
2301 		 * Only clear for recovery to avoid extra cleanup runs during
2302 		 * termination.
2303 		 */
2304 		spin_lock_irq(&conn->lock);
2305 		clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2306 		spin_unlock_irq(&conn->lock);
2307 	}
2308 	ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop done.\n");
2309 	return 0;
2310 }
2311 
2312 static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
2313 {
2314 	struct iscsi_cls_conn *conn = container_of(work, struct iscsi_cls_conn,
2315 						   cleanup_work);
2316 	struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2317 
2318 	mutex_lock(&conn->ep_mutex);
2319 	/*
2320 	 * Get a ref to the ep, so we don't release its ID until after
2321 	 * userspace is done referencing it in iscsi_if_disconnect_bound_ep.
2322 	 */
2323 	if (conn->ep)
2324 		get_device(&conn->ep->dev);
2325 	iscsi_ep_disconnect(conn, false);
2326 
2327 	if (system_state != SYSTEM_RUNNING) {
2328 		/*
2329 		 * If the user has set up for the session to never timeout
2330 		 * then hang like they wanted. For all other cases fail right
2331 		 * away since userspace is not going to relogin.
2332 		 */
2333 		if (session->recovery_tmo > 0)
2334 			session->recovery_tmo = 0;
2335 	}
2336 
2337 	iscsi_stop_conn(conn, STOP_CONN_RECOVER);
2338 	mutex_unlock(&conn->ep_mutex);
2339 	ISCSI_DBG_TRANS_CONN(conn, "cleanup done.\n");
2340 }
2341 
2342 static int iscsi_iter_force_destroy_conn_fn(struct device *dev, void *data)
2343 {
2344 	struct iscsi_transport *transport;
2345 	struct iscsi_cls_conn *conn;
2346 
2347 	if (!iscsi_is_conn_dev(dev))
2348 		return 0;
2349 
2350 	conn = iscsi_dev_to_conn(dev);
2351 	transport = conn->transport;
2352 
2353 	if (READ_ONCE(conn->state) != ISCSI_CONN_DOWN)
2354 		iscsi_if_stop_conn(conn, STOP_CONN_TERM);
2355 
2356 	transport->destroy_conn(conn);
2357 	return 0;
2358 }
2359 
2360 /**
2361  * iscsi_force_destroy_session - destroy a session from the kernel
2362  * @session: session to destroy
2363  *
2364  * Force the destruction of a session from the kernel. This should only be
2365  * used when userspace is no longer running during system shutdown.
2366  */
2367 void iscsi_force_destroy_session(struct iscsi_cls_session *session)
2368 {
2369 	struct iscsi_transport *transport = session->transport;
2370 	unsigned long flags;
2371 
2372 	WARN_ON_ONCE(system_state == SYSTEM_RUNNING);
2373 
2374 	spin_lock_irqsave(&sesslock, flags);
2375 	if (list_empty(&session->sess_list)) {
2376 		spin_unlock_irqrestore(&sesslock, flags);
2377 		/*
2378 		 * Conn/ep is already freed. Session is being torn down via
2379 		 * async path. For shutdown we don't care about it so return.
2380 		 */
2381 		return;
2382 	}
2383 	spin_unlock_irqrestore(&sesslock, flags);
2384 
2385 	device_for_each_child(&session->dev, NULL,
2386 			      iscsi_iter_force_destroy_conn_fn);
2387 	transport->destroy_session(session);
2388 }
2389 EXPORT_SYMBOL_GPL(iscsi_force_destroy_session);
2390 
2391 void iscsi_free_session(struct iscsi_cls_session *session)
2392 {
2393 	ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2394 	iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2395 	put_device(&session->dev);
2396 }
2397 EXPORT_SYMBOL_GPL(iscsi_free_session);
2398 
2399 /**
2400  * iscsi_alloc_conn - alloc iscsi class connection
2401  * @session: iscsi cls session
2402  * @dd_size: private driver data size
2403  * @cid: connection id
2404  */
2405 struct iscsi_cls_conn *
2406 iscsi_alloc_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2407 {
2408 	struct iscsi_transport *transport = session->transport;
2409 	struct iscsi_cls_conn *conn;
2410 
2411 	conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2412 	if (!conn)
2413 		return NULL;
2414 	if (dd_size)
2415 		conn->dd_data = &conn[1];
2416 
2417 	mutex_init(&conn->ep_mutex);
2418 	spin_lock_init(&conn->lock);
2419 	INIT_LIST_HEAD(&conn->conn_list);
2420 	INIT_WORK(&conn->cleanup_work, iscsi_cleanup_conn_work_fn);
2421 	conn->transport = transport;
2422 	conn->cid = cid;
2423 	WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2424 
2425 	/* this is released in the dev's release function */
2426 	if (!get_device(&session->dev))
2427 		goto free_conn;
2428 
2429 	dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2430 	device_initialize(&conn->dev);
2431 	conn->dev.parent = &session->dev;
2432 	conn->dev.release = iscsi_conn_release;
2433 
2434 	return conn;
2435 
2436 free_conn:
2437 	kfree(conn);
2438 	return NULL;
2439 }
2440 EXPORT_SYMBOL_GPL(iscsi_alloc_conn);
2441 
2442 /**
2443  * iscsi_add_conn - add iscsi class connection
2444  * @conn: iscsi cls connection
2445  *
2446  * This will expose iscsi_cls_conn to sysfs so make sure the related
2447  * resources for sysfs attributes are initialized before calling this.
2448  */
2449 int iscsi_add_conn(struct iscsi_cls_conn *conn)
2450 {
2451 	int err;
2452 	unsigned long flags;
2453 	struct iscsi_cls_session *session = iscsi_dev_to_session(conn->dev.parent);
2454 
2455 	err = device_add(&conn->dev);
2456 	if (err) {
2457 		iscsi_cls_session_printk(KERN_ERR, session,
2458 					 "could not register connection's dev\n");
2459 		return err;
2460 	}
2461 	err = transport_register_device(&conn->dev);
2462 	if (err) {
2463 		iscsi_cls_session_printk(KERN_ERR, session,
2464 					 "could not register transport's dev\n");
2465 		device_del(&conn->dev);
2466 		return err;
2467 	}
2468 
2469 	spin_lock_irqsave(&connlock, flags);
2470 	list_add(&conn->conn_list, &connlist);
2471 	spin_unlock_irqrestore(&connlock, flags);
2472 
2473 	return 0;
2474 }
2475 EXPORT_SYMBOL_GPL(iscsi_add_conn);
2476 
2477 /**
2478  * iscsi_remove_conn - remove iscsi class connection from sysfs
2479  * @conn: iscsi cls connection
2480  *
2481  * Remove iscsi_cls_conn from sysfs, and wait for previous
2482  * read/write of iscsi_cls_conn's attributes in sysfs to finish.
2483  */
2484 void iscsi_remove_conn(struct iscsi_cls_conn *conn)
2485 {
2486 	unsigned long flags;
2487 
2488 	spin_lock_irqsave(&connlock, flags);
2489 	list_del(&conn->conn_list);
2490 	spin_unlock_irqrestore(&connlock, flags);
2491 
2492 	transport_unregister_device(&conn->dev);
2493 	device_del(&conn->dev);
2494 }
2495 EXPORT_SYMBOL_GPL(iscsi_remove_conn);
2496 
2497 void iscsi_put_conn(struct iscsi_cls_conn *conn)
2498 {
2499 	put_device(&conn->dev);
2500 }
2501 EXPORT_SYMBOL_GPL(iscsi_put_conn);
2502 
2503 void iscsi_get_conn(struct iscsi_cls_conn *conn)
2504 {
2505 	get_device(&conn->dev);
2506 }
2507 EXPORT_SYMBOL_GPL(iscsi_get_conn);
2508 
2509 /*
2510  * iscsi interface functions
2511  */
2512 static struct iscsi_internal *
2513 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2514 {
2515 	struct iscsi_internal *priv;
2516 	unsigned long flags;
2517 
2518 	spin_lock_irqsave(&iscsi_transport_lock, flags);
2519 	list_for_each_entry(priv, &iscsi_transports, list) {
2520 		if (tt == priv->iscsi_transport) {
2521 			spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2522 			return priv;
2523 		}
2524 	}
2525 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2526 	return NULL;
2527 }
2528 
2529 static int
2530 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2531 {
2532 	return nlmsg_multicast(nls, skb, 0, group, gfp);
2533 }
2534 
2535 static int
2536 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2537 {
2538 	return nlmsg_unicast(nls, skb, portid);
2539 }
2540 
2541 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2542 		   char *data, uint32_t data_size)
2543 {
2544 	struct nlmsghdr	*nlh;
2545 	struct sk_buff *skb;
2546 	struct iscsi_uevent *ev;
2547 	char *pdu;
2548 	struct iscsi_internal *priv;
2549 	int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2550 				   data_size);
2551 
2552 	priv = iscsi_if_transport_lookup(conn->transport);
2553 	if (!priv)
2554 		return -EINVAL;
2555 
2556 	skb = alloc_skb(len, GFP_ATOMIC);
2557 	if (!skb) {
2558 		iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2559 		iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2560 				      "control PDU: OOM\n");
2561 		return -ENOMEM;
2562 	}
2563 
2564 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2565 	ev = nlmsg_data(nlh);
2566 	memset(ev, 0, sizeof(*ev));
2567 	ev->transport_handle = iscsi_handle(conn->transport);
2568 	ev->type = ISCSI_KEVENT_RECV_PDU;
2569 	ev->r.recv_req.cid = conn->cid;
2570 	ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2571 	pdu = (char*)ev + sizeof(*ev);
2572 	memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2573 	memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2574 
2575 	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2576 }
2577 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2578 
2579 int iscsi_offload_mesg(struct Scsi_Host *shost,
2580 		       struct iscsi_transport *transport, uint32_t type,
2581 		       char *data, uint16_t data_size)
2582 {
2583 	struct nlmsghdr	*nlh;
2584 	struct sk_buff *skb;
2585 	struct iscsi_uevent *ev;
2586 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2587 
2588 	skb = alloc_skb(len, GFP_ATOMIC);
2589 	if (!skb) {
2590 		printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2591 		return -ENOMEM;
2592 	}
2593 
2594 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2595 	ev = nlmsg_data(nlh);
2596 	memset(ev, 0, sizeof(*ev));
2597 	ev->type = type;
2598 	ev->transport_handle = iscsi_handle(transport);
2599 	switch (type) {
2600 	case ISCSI_KEVENT_PATH_REQ:
2601 		ev->r.req_path.host_no = shost->host_no;
2602 		break;
2603 	case ISCSI_KEVENT_IF_DOWN:
2604 		ev->r.notify_if_down.host_no = shost->host_no;
2605 		break;
2606 	}
2607 
2608 	memcpy((char *)ev + sizeof(*ev), data, data_size);
2609 
2610 	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2611 }
2612 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2613 
2614 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2615 {
2616 	struct nlmsghdr	*nlh;
2617 	struct sk_buff	*skb;
2618 	struct iscsi_uevent *ev;
2619 	struct iscsi_internal *priv;
2620 	int len = nlmsg_total_size(sizeof(*ev));
2621 	unsigned long flags;
2622 	int state;
2623 
2624 	spin_lock_irqsave(&conn->lock, flags);
2625 	/*
2626 	 * Userspace will only do a stop call if we are at least bound. And, we
2627 	 * only need to do the in kernel cleanup if in the UP state so cmds can
2628 	 * be released to upper layers. If in other states just wait for
2629 	 * userspace to avoid races that can leave the cleanup_work queued.
2630 	 */
2631 	state = READ_ONCE(conn->state);
2632 	switch (state) {
2633 	case ISCSI_CONN_BOUND:
2634 	case ISCSI_CONN_UP:
2635 		if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP,
2636 				      &conn->flags)) {
2637 			queue_work(iscsi_conn_cleanup_workq,
2638 				   &conn->cleanup_work);
2639 		}
2640 		break;
2641 	default:
2642 		ISCSI_DBG_TRANS_CONN(conn, "Got conn error in state %d\n",
2643 				     state);
2644 		break;
2645 	}
2646 	spin_unlock_irqrestore(&conn->lock, flags);
2647 
2648 	priv = iscsi_if_transport_lookup(conn->transport);
2649 	if (!priv)
2650 		return;
2651 
2652 	skb = alloc_skb(len, GFP_ATOMIC);
2653 	if (!skb) {
2654 		iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2655 				      "conn error (%d)\n", error);
2656 		return;
2657 	}
2658 
2659 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2660 	ev = nlmsg_data(nlh);
2661 	ev->transport_handle = iscsi_handle(conn->transport);
2662 	ev->type = ISCSI_KEVENT_CONN_ERROR;
2663 	ev->r.connerror.error = error;
2664 	ev->r.connerror.cid = conn->cid;
2665 	ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2666 
2667 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2668 
2669 	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2670 			      error);
2671 }
2672 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2673 
2674 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2675 			    enum iscsi_conn_state state)
2676 {
2677 	struct nlmsghdr *nlh;
2678 	struct sk_buff  *skb;
2679 	struct iscsi_uevent *ev;
2680 	struct iscsi_internal *priv;
2681 	int len = nlmsg_total_size(sizeof(*ev));
2682 
2683 	priv = iscsi_if_transport_lookup(conn->transport);
2684 	if (!priv)
2685 		return;
2686 
2687 	skb = alloc_skb(len, GFP_ATOMIC);
2688 	if (!skb) {
2689 		iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2690 				      "conn login (%d)\n", state);
2691 		return;
2692 	}
2693 
2694 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2695 	ev = nlmsg_data(nlh);
2696 	ev->transport_handle = iscsi_handle(conn->transport);
2697 	ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2698 	ev->r.conn_login.state = state;
2699 	ev->r.conn_login.cid = conn->cid;
2700 	ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2701 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2702 
2703 	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2704 			      state);
2705 }
2706 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2707 
2708 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2709 			   enum iscsi_host_event_code code, uint32_t data_size,
2710 			   uint8_t *data)
2711 {
2712 	struct nlmsghdr *nlh;
2713 	struct sk_buff *skb;
2714 	struct iscsi_uevent *ev;
2715 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2716 
2717 	skb = alloc_skb(len, GFP_NOIO);
2718 	if (!skb) {
2719 		printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2720 		       host_no, code);
2721 		return;
2722 	}
2723 
2724 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2725 	ev = nlmsg_data(nlh);
2726 	ev->transport_handle = iscsi_handle(transport);
2727 	ev->type = ISCSI_KEVENT_HOST_EVENT;
2728 	ev->r.host_event.host_no = host_no;
2729 	ev->r.host_event.code = code;
2730 	ev->r.host_event.data_size = data_size;
2731 
2732 	if (data_size)
2733 		memcpy((char *)ev + sizeof(*ev), data, data_size);
2734 
2735 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2736 }
2737 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2738 
2739 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2740 			   uint32_t status, uint32_t pid, uint32_t data_size,
2741 			   uint8_t *data)
2742 {
2743 	struct nlmsghdr *nlh;
2744 	struct sk_buff *skb;
2745 	struct iscsi_uevent *ev;
2746 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2747 
2748 	skb = alloc_skb(len, GFP_NOIO);
2749 	if (!skb) {
2750 		printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2751 		return;
2752 	}
2753 
2754 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2755 	ev = nlmsg_data(nlh);
2756 	ev->transport_handle = iscsi_handle(transport);
2757 	ev->type = ISCSI_KEVENT_PING_COMP;
2758 	ev->r.ping_comp.host_no = host_no;
2759 	ev->r.ping_comp.status = status;
2760 	ev->r.ping_comp.pid = pid;
2761 	ev->r.ping_comp.data_size = data_size;
2762 	memcpy((char *)ev + sizeof(*ev), data, data_size);
2763 
2764 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2765 }
2766 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2767 
2768 static int
2769 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2770 {
2771 	struct sk_buff	*skb;
2772 	struct nlmsghdr	*nlh;
2773 	int len = nlmsg_total_size(size);
2774 
2775 	skb = alloc_skb(len, GFP_ATOMIC);
2776 	if (!skb) {
2777 		printk(KERN_ERR "Could not allocate skb to send reply.\n");
2778 		return -ENOMEM;
2779 	}
2780 
2781 	nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2782 	memcpy(nlmsg_data(nlh), payload, size);
2783 	return iscsi_unicast_skb(skb, portid);
2784 }
2785 
2786 static int
2787 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2788 {
2789 	struct iscsi_uevent *ev = nlmsg_data(nlh);
2790 	struct iscsi_stats *stats;
2791 	struct sk_buff *skbstat;
2792 	struct iscsi_cls_conn *conn;
2793 	struct nlmsghdr	*nlhstat;
2794 	struct iscsi_uevent *evstat;
2795 	struct iscsi_internal *priv;
2796 	int len = nlmsg_total_size(sizeof(*ev) +
2797 				   sizeof(struct iscsi_stats) +
2798 				   sizeof(struct iscsi_stats_custom) *
2799 				   ISCSI_STATS_CUSTOM_MAX);
2800 	int err = 0;
2801 
2802 	priv = iscsi_if_transport_lookup(transport);
2803 	if (!priv)
2804 		return -EINVAL;
2805 
2806 	conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2807 	if (!conn)
2808 		return -EEXIST;
2809 
2810 	do {
2811 		int actual_size;
2812 
2813 		skbstat = alloc_skb(len, GFP_ATOMIC);
2814 		if (!skbstat) {
2815 			iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2816 					      "deliver stats: OOM\n");
2817 			return -ENOMEM;
2818 		}
2819 
2820 		nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2821 				      (len - sizeof(*nlhstat)), 0);
2822 		evstat = nlmsg_data(nlhstat);
2823 		memset(evstat, 0, sizeof(*evstat));
2824 		evstat->transport_handle = iscsi_handle(conn->transport);
2825 		evstat->type = nlh->nlmsg_type;
2826 		evstat->u.get_stats.cid =
2827 			ev->u.get_stats.cid;
2828 		evstat->u.get_stats.sid =
2829 			ev->u.get_stats.sid;
2830 		stats = (struct iscsi_stats *)
2831 			((char*)evstat + sizeof(*evstat));
2832 		memset(stats, 0, sizeof(*stats));
2833 
2834 		transport->get_stats(conn, stats);
2835 		actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2836 					       sizeof(struct iscsi_stats) +
2837 					       sizeof(struct iscsi_stats_custom) *
2838 					       stats->custom_length);
2839 		actual_size -= sizeof(*nlhstat);
2840 		actual_size = nlmsg_msg_size(actual_size);
2841 		skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2842 		nlhstat->nlmsg_len = actual_size;
2843 
2844 		err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2845 					  GFP_ATOMIC);
2846 	} while (err < 0 && err != -ECONNREFUSED);
2847 
2848 	return err;
2849 }
2850 
2851 /**
2852  * iscsi_session_event - send session destr. completion event
2853  * @session: iscsi class session
2854  * @event: type of event
2855  */
2856 int iscsi_session_event(struct iscsi_cls_session *session,
2857 			enum iscsi_uevent_e event)
2858 {
2859 	struct iscsi_internal *priv;
2860 	struct Scsi_Host *shost;
2861 	struct iscsi_uevent *ev;
2862 	struct sk_buff  *skb;
2863 	struct nlmsghdr *nlh;
2864 	int rc, len = nlmsg_total_size(sizeof(*ev));
2865 
2866 	priv = iscsi_if_transport_lookup(session->transport);
2867 	if (!priv)
2868 		return -EINVAL;
2869 	shost = iscsi_session_to_shost(session);
2870 
2871 	skb = alloc_skb(len, GFP_KERNEL);
2872 	if (!skb) {
2873 		iscsi_cls_session_printk(KERN_ERR, session,
2874 					 "Cannot notify userspace of session "
2875 					 "event %u\n", event);
2876 		return -ENOMEM;
2877 	}
2878 
2879 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2880 	ev = nlmsg_data(nlh);
2881 	ev->transport_handle = iscsi_handle(session->transport);
2882 
2883 	ev->type = event;
2884 	switch (event) {
2885 	case ISCSI_KEVENT_DESTROY_SESSION:
2886 		ev->r.d_session.host_no = shost->host_no;
2887 		ev->r.d_session.sid = session->sid;
2888 		break;
2889 	case ISCSI_KEVENT_CREATE_SESSION:
2890 		ev->r.c_session_ret.host_no = shost->host_no;
2891 		ev->r.c_session_ret.sid = session->sid;
2892 		break;
2893 	case ISCSI_KEVENT_UNBIND_SESSION:
2894 		ev->r.unbind_session.host_no = shost->host_no;
2895 		ev->r.unbind_session.sid = session->sid;
2896 		break;
2897 	default:
2898 		iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2899 					 "%u.\n", event);
2900 		kfree_skb(skb);
2901 		return -EINVAL;
2902 	}
2903 
2904 	/*
2905 	 * this will occur if the daemon is not up, so we just warn
2906 	 * the user and when the daemon is restarted it will handle it
2907 	 */
2908 	rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2909 	if (rc == -ESRCH)
2910 		iscsi_cls_session_printk(KERN_ERR, session,
2911 					 "Cannot notify userspace of session "
2912 					 "event %u. Check iscsi daemon\n",
2913 					 event);
2914 
2915 	ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2916 				event, rc);
2917 	return rc;
2918 }
2919 EXPORT_SYMBOL_GPL(iscsi_session_event);
2920 
2921 static int
2922 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2923 			struct iscsi_uevent *ev, pid_t pid,
2924 			uint32_t initial_cmdsn,	uint16_t cmds_max,
2925 			uint16_t queue_depth)
2926 {
2927 	struct iscsi_transport *transport = priv->iscsi_transport;
2928 	struct iscsi_cls_session *session;
2929 	struct Scsi_Host *shost;
2930 
2931 	session = transport->create_session(ep, cmds_max, queue_depth,
2932 					    initial_cmdsn);
2933 	if (!session)
2934 		return -ENOMEM;
2935 
2936 	session->creator = pid;
2937 	shost = iscsi_session_to_shost(session);
2938 	ev->r.c_session_ret.host_no = shost->host_no;
2939 	ev->r.c_session_ret.sid = session->sid;
2940 	ISCSI_DBG_TRANS_SESSION(session,
2941 				"Completed creating transport session\n");
2942 	return 0;
2943 }
2944 
2945 static int
2946 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2947 {
2948 	struct iscsi_cls_conn *conn;
2949 	struct iscsi_cls_session *session;
2950 
2951 	session = iscsi_session_lookup(ev->u.c_conn.sid);
2952 	if (!session) {
2953 		printk(KERN_ERR "iscsi: invalid session %d.\n",
2954 		       ev->u.c_conn.sid);
2955 		return -EINVAL;
2956 	}
2957 
2958 	conn = transport->create_conn(session, ev->u.c_conn.cid);
2959 	if (!conn) {
2960 		iscsi_cls_session_printk(KERN_ERR, session,
2961 					 "couldn't create a new connection.");
2962 		return -ENOMEM;
2963 	}
2964 
2965 	ev->r.c_conn_ret.sid = session->sid;
2966 	ev->r.c_conn_ret.cid = conn->cid;
2967 
2968 	ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2969 	return 0;
2970 }
2971 
2972 static int
2973 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2974 {
2975 	struct iscsi_cls_conn *conn;
2976 
2977 	conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2978 	if (!conn)
2979 		return -EINVAL;
2980 
2981 	ISCSI_DBG_TRANS_CONN(conn, "Flushing cleanup during destruction\n");
2982 	flush_work(&conn->cleanup_work);
2983 	ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2984 
2985 	if (transport->destroy_conn)
2986 		transport->destroy_conn(conn);
2987 	return 0;
2988 }
2989 
2990 static int
2991 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2992 {
2993 	char *data = (char*)ev + sizeof(*ev);
2994 	struct iscsi_cls_conn *conn;
2995 	struct iscsi_cls_session *session;
2996 	int err = 0, value = 0, state;
2997 
2998 	if (ev->u.set_param.len > PAGE_SIZE)
2999 		return -EINVAL;
3000 
3001 	session = iscsi_session_lookup(ev->u.set_param.sid);
3002 	conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
3003 	if (!conn || !session)
3004 		return -EINVAL;
3005 
3006 	switch (ev->u.set_param.param) {
3007 	case ISCSI_PARAM_SESS_RECOVERY_TMO:
3008 		sscanf(data, "%d", &value);
3009 		if (!session->recovery_tmo_sysfs_override)
3010 			session->recovery_tmo = value;
3011 		break;
3012 	default:
3013 		state = READ_ONCE(conn->state);
3014 		if (state == ISCSI_CONN_BOUND || state == ISCSI_CONN_UP) {
3015 			err = transport->set_param(conn, ev->u.set_param.param,
3016 					data, ev->u.set_param.len);
3017 		} else {
3018 			return -ENOTCONN;
3019 		}
3020 	}
3021 
3022 	return err;
3023 }
3024 
3025 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
3026 			       struct iscsi_uevent *ev, int msg_type)
3027 {
3028 	struct iscsi_endpoint *ep;
3029 	struct sockaddr *dst_addr;
3030 	struct Scsi_Host *shost = NULL;
3031 	int non_blocking, err = 0;
3032 
3033 	if (!transport->ep_connect)
3034 		return -EINVAL;
3035 
3036 	if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
3037 		shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
3038 		if (!shost) {
3039 			printk(KERN_ERR "ep connect failed. Could not find "
3040 			       "host no %u\n",
3041 			       ev->u.ep_connect_through_host.host_no);
3042 			return -ENODEV;
3043 		}
3044 		non_blocking = ev->u.ep_connect_through_host.non_blocking;
3045 	} else
3046 		non_blocking = ev->u.ep_connect.non_blocking;
3047 
3048 	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3049 	ep = transport->ep_connect(shost, dst_addr, non_blocking);
3050 	if (IS_ERR(ep)) {
3051 		err = PTR_ERR(ep);
3052 		goto release_host;
3053 	}
3054 
3055 	ev->r.ep_connect_ret.handle = ep->id;
3056 release_host:
3057 	if (shost)
3058 		scsi_host_put(shost);
3059 	return err;
3060 }
3061 
3062 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
3063 				  u64 ep_handle)
3064 {
3065 	struct iscsi_cls_conn *conn;
3066 	struct iscsi_endpoint *ep;
3067 
3068 	if (!transport->ep_disconnect)
3069 		return -EINVAL;
3070 
3071 	ep = iscsi_lookup_endpoint(ep_handle);
3072 	if (!ep)
3073 		return -EINVAL;
3074 
3075 	conn = ep->conn;
3076 	if (!conn) {
3077 		/*
3078 		 * conn was not even bound yet, so we can't get iscsi conn
3079 		 * failures yet.
3080 		 */
3081 		transport->ep_disconnect(ep);
3082 		goto put_ep;
3083 	}
3084 
3085 	mutex_lock(&conn->ep_mutex);
3086 	iscsi_if_disconnect_bound_ep(conn, ep, false);
3087 	mutex_unlock(&conn->ep_mutex);
3088 put_ep:
3089 	iscsi_put_endpoint(ep);
3090 	return 0;
3091 }
3092 
3093 static int
3094 iscsi_if_transport_ep(struct iscsi_transport *transport,
3095 		      struct iscsi_uevent *ev, int msg_type)
3096 {
3097 	struct iscsi_endpoint *ep;
3098 	int rc = 0;
3099 
3100 	switch (msg_type) {
3101 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3102 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3103 		rc = iscsi_if_ep_connect(transport, ev, msg_type);
3104 		break;
3105 	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3106 		if (!transport->ep_poll)
3107 			return -EINVAL;
3108 
3109 		ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
3110 		if (!ep)
3111 			return -EINVAL;
3112 
3113 		ev->r.retcode = transport->ep_poll(ep,
3114 						   ev->u.ep_poll.timeout_ms);
3115 		iscsi_put_endpoint(ep);
3116 		break;
3117 	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3118 		rc = iscsi_if_ep_disconnect(transport,
3119 					    ev->u.ep_disconnect.ep_handle);
3120 		break;
3121 	}
3122 	return rc;
3123 }
3124 
3125 static int
3126 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3127 		struct iscsi_uevent *ev)
3128 {
3129 	struct Scsi_Host *shost;
3130 	struct sockaddr *dst_addr;
3131 	int err;
3132 
3133 	if (!transport->tgt_dscvr)
3134 		return -EINVAL;
3135 
3136 	shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3137 	if (!shost) {
3138 		printk(KERN_ERR "target discovery could not find host no %u\n",
3139 		       ev->u.tgt_dscvr.host_no);
3140 		return -ENODEV;
3141 	}
3142 
3143 
3144 	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3145 	err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3146 				   ev->u.tgt_dscvr.enable, dst_addr);
3147 	scsi_host_put(shost);
3148 	return err;
3149 }
3150 
3151 static int
3152 iscsi_set_host_param(struct iscsi_transport *transport,
3153 		     struct iscsi_uevent *ev)
3154 {
3155 	char *data = (char*)ev + sizeof(*ev);
3156 	struct Scsi_Host *shost;
3157 	int err;
3158 
3159 	if (!transport->set_host_param)
3160 		return -ENOSYS;
3161 
3162 	if (ev->u.set_host_param.len > PAGE_SIZE)
3163 		return -EINVAL;
3164 
3165 	shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3166 	if (!shost) {
3167 		printk(KERN_ERR "set_host_param could not find host no %u\n",
3168 		       ev->u.set_host_param.host_no);
3169 		return -ENODEV;
3170 	}
3171 
3172 	err = transport->set_host_param(shost, ev->u.set_host_param.param,
3173 					data, ev->u.set_host_param.len);
3174 	scsi_host_put(shost);
3175 	return err;
3176 }
3177 
3178 static int
3179 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3180 {
3181 	struct Scsi_Host *shost;
3182 	struct iscsi_path *params;
3183 	int err;
3184 
3185 	if (!transport->set_path)
3186 		return -ENOSYS;
3187 
3188 	shost = scsi_host_lookup(ev->u.set_path.host_no);
3189 	if (!shost) {
3190 		printk(KERN_ERR "set path could not find host no %u\n",
3191 		       ev->u.set_path.host_no);
3192 		return -ENODEV;
3193 	}
3194 
3195 	params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3196 	err = transport->set_path(shost, params);
3197 
3198 	scsi_host_put(shost);
3199 	return err;
3200 }
3201 
3202 static int iscsi_session_has_conns(int sid)
3203 {
3204 	struct iscsi_cls_conn *conn;
3205 	unsigned long flags;
3206 	int found = 0;
3207 
3208 	spin_lock_irqsave(&connlock, flags);
3209 	list_for_each_entry(conn, &connlist, conn_list) {
3210 		if (iscsi_conn_get_sid(conn) == sid) {
3211 			found = 1;
3212 			break;
3213 		}
3214 	}
3215 	spin_unlock_irqrestore(&connlock, flags);
3216 
3217 	return found;
3218 }
3219 
3220 static int
3221 iscsi_set_iface_params(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 err;
3227 
3228 	if (!transport->set_iface_param)
3229 		return -ENOSYS;
3230 
3231 	shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3232 	if (!shost) {
3233 		printk(KERN_ERR "set_iface_params could not find host no %u\n",
3234 		       ev->u.set_iface_params.host_no);
3235 		return -ENODEV;
3236 	}
3237 
3238 	err = transport->set_iface_param(shost, data, len);
3239 	scsi_host_put(shost);
3240 	return err;
3241 }
3242 
3243 static int
3244 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3245 {
3246 	struct Scsi_Host *shost;
3247 	struct sockaddr *dst_addr;
3248 	int err;
3249 
3250 	if (!transport->send_ping)
3251 		return -ENOSYS;
3252 
3253 	shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3254 	if (!shost) {
3255 		printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3256 		       ev->u.iscsi_ping.host_no);
3257 		return -ENODEV;
3258 	}
3259 
3260 	dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3261 	err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3262 				   ev->u.iscsi_ping.iface_type,
3263 				   ev->u.iscsi_ping.payload_size,
3264 				   ev->u.iscsi_ping.pid,
3265 				   dst_addr);
3266 	scsi_host_put(shost);
3267 	return err;
3268 }
3269 
3270 static int
3271 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3272 {
3273 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3274 	struct Scsi_Host *shost = NULL;
3275 	struct iscsi_chap_rec *chap_rec;
3276 	struct iscsi_internal *priv;
3277 	struct sk_buff *skbchap;
3278 	struct nlmsghdr *nlhchap;
3279 	struct iscsi_uevent *evchap;
3280 	uint32_t chap_buf_size;
3281 	int len, err = 0;
3282 	char *buf;
3283 
3284 	if (!transport->get_chap)
3285 		return -EINVAL;
3286 
3287 	priv = iscsi_if_transport_lookup(transport);
3288 	if (!priv)
3289 		return -EINVAL;
3290 
3291 	chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3292 	len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3293 
3294 	shost = scsi_host_lookup(ev->u.get_chap.host_no);
3295 	if (!shost) {
3296 		printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3297 		       __func__, ev->u.get_chap.host_no);
3298 		return -ENODEV;
3299 	}
3300 
3301 	do {
3302 		int actual_size;
3303 
3304 		skbchap = alloc_skb(len, GFP_KERNEL);
3305 		if (!skbchap) {
3306 			printk(KERN_ERR "can not deliver chap: OOM\n");
3307 			err = -ENOMEM;
3308 			goto exit_get_chap;
3309 		}
3310 
3311 		nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3312 				      (len - sizeof(*nlhchap)), 0);
3313 		evchap = nlmsg_data(nlhchap);
3314 		memset(evchap, 0, sizeof(*evchap));
3315 		evchap->transport_handle = iscsi_handle(transport);
3316 		evchap->type = nlh->nlmsg_type;
3317 		evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3318 		evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3319 		evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3320 		buf = (char *)evchap + sizeof(*evchap);
3321 		memset(buf, 0, chap_buf_size);
3322 
3323 		err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3324 				    &evchap->u.get_chap.num_entries, buf);
3325 
3326 		actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3327 		skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3328 		nlhchap->nlmsg_len = actual_size;
3329 
3330 		err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3331 					  GFP_KERNEL);
3332 	} while (err < 0 && err != -ECONNREFUSED);
3333 
3334 exit_get_chap:
3335 	scsi_host_put(shost);
3336 	return err;
3337 }
3338 
3339 static int iscsi_set_chap(struct iscsi_transport *transport,
3340 			  struct iscsi_uevent *ev, uint32_t len)
3341 {
3342 	char *data = (char *)ev + sizeof(*ev);
3343 	struct Scsi_Host *shost;
3344 	int err = 0;
3345 
3346 	if (!transport->set_chap)
3347 		return -ENOSYS;
3348 
3349 	shost = scsi_host_lookup(ev->u.set_path.host_no);
3350 	if (!shost) {
3351 		pr_err("%s could not find host no %u\n",
3352 		       __func__, ev->u.set_path.host_no);
3353 		return -ENODEV;
3354 	}
3355 
3356 	err = transport->set_chap(shost, data, len);
3357 	scsi_host_put(shost);
3358 	return err;
3359 }
3360 
3361 static int iscsi_delete_chap(struct iscsi_transport *transport,
3362 			     struct iscsi_uevent *ev)
3363 {
3364 	struct Scsi_Host *shost;
3365 	int err = 0;
3366 
3367 	if (!transport->delete_chap)
3368 		return -ENOSYS;
3369 
3370 	shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3371 	if (!shost) {
3372 		printk(KERN_ERR "%s could not find host no %u\n",
3373 		       __func__, ev->u.delete_chap.host_no);
3374 		return -ENODEV;
3375 	}
3376 
3377 	err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3378 	scsi_host_put(shost);
3379 	return err;
3380 }
3381 
3382 static const struct {
3383 	enum iscsi_discovery_parent_type value;
3384 	char				*name;
3385 } iscsi_discovery_parent_names[] = {
3386 	{ISCSI_DISC_PARENT_UNKNOWN,	"Unknown" },
3387 	{ISCSI_DISC_PARENT_SENDTGT,	"Sendtarget" },
3388 	{ISCSI_DISC_PARENT_ISNS,	"isns" },
3389 };
3390 
3391 char *iscsi_get_discovery_parent_name(int parent_type)
3392 {
3393 	int i;
3394 	char *state = "Unknown!";
3395 
3396 	for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3397 		if (iscsi_discovery_parent_names[i].value & parent_type) {
3398 			state = iscsi_discovery_parent_names[i].name;
3399 			break;
3400 		}
3401 	}
3402 	return state;
3403 }
3404 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3405 
3406 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3407 				     struct iscsi_uevent *ev, uint32_t len)
3408 {
3409 	char *data = (char *)ev + sizeof(*ev);
3410 	struct Scsi_Host *shost;
3411 	struct iscsi_bus_flash_session *fnode_sess;
3412 	struct iscsi_bus_flash_conn *fnode_conn;
3413 	struct device *dev;
3414 	uint32_t idx;
3415 	int err = 0;
3416 
3417 	if (!transport->set_flashnode_param) {
3418 		err = -ENOSYS;
3419 		goto exit_set_fnode;
3420 	}
3421 
3422 	shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3423 	if (!shost) {
3424 		pr_err("%s could not find host no %u\n",
3425 		       __func__, ev->u.set_flashnode.host_no);
3426 		err = -ENODEV;
3427 		goto exit_set_fnode;
3428 	}
3429 
3430 	idx = ev->u.set_flashnode.flashnode_idx;
3431 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3432 	if (!fnode_sess) {
3433 		pr_err("%s could not find flashnode %u for host no %u\n",
3434 		       __func__, idx, ev->u.set_flashnode.host_no);
3435 		err = -ENODEV;
3436 		goto put_host;
3437 	}
3438 
3439 	dev = iscsi_find_flashnode_conn(fnode_sess);
3440 	if (!dev) {
3441 		err = -ENODEV;
3442 		goto put_sess;
3443 	}
3444 
3445 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3446 	err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3447 	put_device(dev);
3448 
3449 put_sess:
3450 	put_device(&fnode_sess->dev);
3451 
3452 put_host:
3453 	scsi_host_put(shost);
3454 
3455 exit_set_fnode:
3456 	return err;
3457 }
3458 
3459 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3460 			       struct iscsi_uevent *ev, uint32_t len)
3461 {
3462 	char *data = (char *)ev + sizeof(*ev);
3463 	struct Scsi_Host *shost;
3464 	int index;
3465 	int err = 0;
3466 
3467 	if (!transport->new_flashnode) {
3468 		err = -ENOSYS;
3469 		goto exit_new_fnode;
3470 	}
3471 
3472 	shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3473 	if (!shost) {
3474 		pr_err("%s could not find host no %u\n",
3475 		       __func__, ev->u.new_flashnode.host_no);
3476 		err = -ENODEV;
3477 		goto put_host;
3478 	}
3479 
3480 	index = transport->new_flashnode(shost, data, len);
3481 
3482 	if (index >= 0)
3483 		ev->r.new_flashnode_ret.flashnode_idx = index;
3484 	else
3485 		err = -EIO;
3486 
3487 put_host:
3488 	scsi_host_put(shost);
3489 
3490 exit_new_fnode:
3491 	return err;
3492 }
3493 
3494 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3495 			       struct iscsi_uevent *ev)
3496 {
3497 	struct Scsi_Host *shost;
3498 	struct iscsi_bus_flash_session *fnode_sess;
3499 	uint32_t idx;
3500 	int err = 0;
3501 
3502 	if (!transport->del_flashnode) {
3503 		err = -ENOSYS;
3504 		goto exit_del_fnode;
3505 	}
3506 
3507 	shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3508 	if (!shost) {
3509 		pr_err("%s could not find host no %u\n",
3510 		       __func__, ev->u.del_flashnode.host_no);
3511 		err = -ENODEV;
3512 		goto put_host;
3513 	}
3514 
3515 	idx = ev->u.del_flashnode.flashnode_idx;
3516 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3517 	if (!fnode_sess) {
3518 		pr_err("%s could not find flashnode %u for host no %u\n",
3519 		       __func__, idx, ev->u.del_flashnode.host_no);
3520 		err = -ENODEV;
3521 		goto put_host;
3522 	}
3523 
3524 	err = transport->del_flashnode(fnode_sess);
3525 	put_device(&fnode_sess->dev);
3526 
3527 put_host:
3528 	scsi_host_put(shost);
3529 
3530 exit_del_fnode:
3531 	return err;
3532 }
3533 
3534 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3535 				 struct iscsi_uevent *ev)
3536 {
3537 	struct Scsi_Host *shost;
3538 	struct iscsi_bus_flash_session *fnode_sess;
3539 	struct iscsi_bus_flash_conn *fnode_conn;
3540 	struct device *dev;
3541 	uint32_t idx;
3542 	int err = 0;
3543 
3544 	if (!transport->login_flashnode) {
3545 		err = -ENOSYS;
3546 		goto exit_login_fnode;
3547 	}
3548 
3549 	shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3550 	if (!shost) {
3551 		pr_err("%s could not find host no %u\n",
3552 		       __func__, ev->u.login_flashnode.host_no);
3553 		err = -ENODEV;
3554 		goto put_host;
3555 	}
3556 
3557 	idx = ev->u.login_flashnode.flashnode_idx;
3558 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3559 	if (!fnode_sess) {
3560 		pr_err("%s could not find flashnode %u for host no %u\n",
3561 		       __func__, idx, ev->u.login_flashnode.host_no);
3562 		err = -ENODEV;
3563 		goto put_host;
3564 	}
3565 
3566 	dev = iscsi_find_flashnode_conn(fnode_sess);
3567 	if (!dev) {
3568 		err = -ENODEV;
3569 		goto put_sess;
3570 	}
3571 
3572 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3573 	err = transport->login_flashnode(fnode_sess, fnode_conn);
3574 	put_device(dev);
3575 
3576 put_sess:
3577 	put_device(&fnode_sess->dev);
3578 
3579 put_host:
3580 	scsi_host_put(shost);
3581 
3582 exit_login_fnode:
3583 	return err;
3584 }
3585 
3586 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3587 				  struct iscsi_uevent *ev)
3588 {
3589 	struct Scsi_Host *shost;
3590 	struct iscsi_bus_flash_session *fnode_sess;
3591 	struct iscsi_bus_flash_conn *fnode_conn;
3592 	struct device *dev;
3593 	uint32_t idx;
3594 	int err = 0;
3595 
3596 	if (!transport->logout_flashnode) {
3597 		err = -ENOSYS;
3598 		goto exit_logout_fnode;
3599 	}
3600 
3601 	shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3602 	if (!shost) {
3603 		pr_err("%s could not find host no %u\n",
3604 		       __func__, ev->u.logout_flashnode.host_no);
3605 		err = -ENODEV;
3606 		goto put_host;
3607 	}
3608 
3609 	idx = ev->u.logout_flashnode.flashnode_idx;
3610 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3611 	if (!fnode_sess) {
3612 		pr_err("%s could not find flashnode %u for host no %u\n",
3613 		       __func__, idx, ev->u.logout_flashnode.host_no);
3614 		err = -ENODEV;
3615 		goto put_host;
3616 	}
3617 
3618 	dev = iscsi_find_flashnode_conn(fnode_sess);
3619 	if (!dev) {
3620 		err = -ENODEV;
3621 		goto put_sess;
3622 	}
3623 
3624 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3625 
3626 	err = transport->logout_flashnode(fnode_sess, fnode_conn);
3627 	put_device(dev);
3628 
3629 put_sess:
3630 	put_device(&fnode_sess->dev);
3631 
3632 put_host:
3633 	scsi_host_put(shost);
3634 
3635 exit_logout_fnode:
3636 	return err;
3637 }
3638 
3639 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3640 				      struct iscsi_uevent *ev)
3641 {
3642 	struct Scsi_Host *shost;
3643 	struct iscsi_cls_session *session;
3644 	int err = 0;
3645 
3646 	if (!transport->logout_flashnode_sid) {
3647 		err = -ENOSYS;
3648 		goto exit_logout_sid;
3649 	}
3650 
3651 	shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3652 	if (!shost) {
3653 		pr_err("%s could not find host no %u\n",
3654 		       __func__, ev->u.logout_flashnode.host_no);
3655 		err = -ENODEV;
3656 		goto put_host;
3657 	}
3658 
3659 	session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3660 	if (!session) {
3661 		pr_err("%s could not find session id %u\n",
3662 		       __func__, ev->u.logout_flashnode_sid.sid);
3663 		err = -EINVAL;
3664 		goto put_host;
3665 	}
3666 
3667 	err = transport->logout_flashnode_sid(session);
3668 
3669 put_host:
3670 	scsi_host_put(shost);
3671 
3672 exit_logout_sid:
3673 	return err;
3674 }
3675 
3676 static int
3677 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3678 {
3679 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3680 	struct Scsi_Host *shost = NULL;
3681 	struct iscsi_internal *priv;
3682 	struct sk_buff *skbhost_stats;
3683 	struct nlmsghdr *nlhhost_stats;
3684 	struct iscsi_uevent *evhost_stats;
3685 	int host_stats_size = 0;
3686 	int len, err = 0;
3687 	char *buf;
3688 
3689 	if (!transport->get_host_stats)
3690 		return -ENOSYS;
3691 
3692 	priv = iscsi_if_transport_lookup(transport);
3693 	if (!priv)
3694 		return -EINVAL;
3695 
3696 	host_stats_size = sizeof(struct iscsi_offload_host_stats);
3697 	len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3698 
3699 	shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3700 	if (!shost) {
3701 		pr_err("%s: failed. Could not find host no %u\n",
3702 		       __func__, ev->u.get_host_stats.host_no);
3703 		return -ENODEV;
3704 	}
3705 
3706 	do {
3707 		int actual_size;
3708 
3709 		skbhost_stats = alloc_skb(len, GFP_KERNEL);
3710 		if (!skbhost_stats) {
3711 			pr_err("cannot deliver host stats: OOM\n");
3712 			err = -ENOMEM;
3713 			goto exit_host_stats;
3714 		}
3715 
3716 		nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3717 				      (len - sizeof(*nlhhost_stats)), 0);
3718 		evhost_stats = nlmsg_data(nlhhost_stats);
3719 		memset(evhost_stats, 0, sizeof(*evhost_stats));
3720 		evhost_stats->transport_handle = iscsi_handle(transport);
3721 		evhost_stats->type = nlh->nlmsg_type;
3722 		evhost_stats->u.get_host_stats.host_no =
3723 					ev->u.get_host_stats.host_no;
3724 		buf = (char *)evhost_stats + sizeof(*evhost_stats);
3725 		memset(buf, 0, host_stats_size);
3726 
3727 		err = transport->get_host_stats(shost, buf, host_stats_size);
3728 		if (err) {
3729 			kfree_skb(skbhost_stats);
3730 			goto exit_host_stats;
3731 		}
3732 
3733 		actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3734 		skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3735 		nlhhost_stats->nlmsg_len = actual_size;
3736 
3737 		err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3738 					  GFP_KERNEL);
3739 	} while (err < 0 && err != -ECONNREFUSED);
3740 
3741 exit_host_stats:
3742 	scsi_host_put(shost);
3743 	return err;
3744 }
3745 
3746 static int iscsi_if_transport_conn(struct iscsi_transport *transport,
3747 				   struct nlmsghdr *nlh)
3748 {
3749 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3750 	struct iscsi_cls_session *session;
3751 	struct iscsi_cls_conn *conn = NULL;
3752 	struct iscsi_endpoint *ep;
3753 	uint32_t pdu_len;
3754 	int err = 0;
3755 
3756 	switch (nlh->nlmsg_type) {
3757 	case ISCSI_UEVENT_CREATE_CONN:
3758 		return iscsi_if_create_conn(transport, ev);
3759 	case ISCSI_UEVENT_DESTROY_CONN:
3760 		return iscsi_if_destroy_conn(transport, ev);
3761 	case ISCSI_UEVENT_STOP_CONN:
3762 		conn = iscsi_conn_lookup(ev->u.stop_conn.sid,
3763 					 ev->u.stop_conn.cid);
3764 		if (!conn)
3765 			return -EINVAL;
3766 
3767 		return iscsi_if_stop_conn(conn, ev->u.stop_conn.flag);
3768 	}
3769 
3770 	/*
3771 	 * The following cmds need to be run under the ep_mutex so in kernel
3772 	 * conn cleanup (ep_disconnect + unbind and conn) is not done while
3773 	 * these are running. They also must not run if we have just run a conn
3774 	 * cleanup because they would set the state in a way that might allow
3775 	 * IO or send IO themselves.
3776 	 */
3777 	switch (nlh->nlmsg_type) {
3778 	case ISCSI_UEVENT_START_CONN:
3779 		conn = iscsi_conn_lookup(ev->u.start_conn.sid,
3780 					 ev->u.start_conn.cid);
3781 		break;
3782 	case ISCSI_UEVENT_BIND_CONN:
3783 		conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3784 		break;
3785 	case ISCSI_UEVENT_SEND_PDU:
3786 		conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3787 		break;
3788 	}
3789 
3790 	if (!conn)
3791 		return -EINVAL;
3792 
3793 	mutex_lock(&conn->ep_mutex);
3794 	spin_lock_irq(&conn->lock);
3795 	if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3796 		spin_unlock_irq(&conn->lock);
3797 		mutex_unlock(&conn->ep_mutex);
3798 		ev->r.retcode = -ENOTCONN;
3799 		return 0;
3800 	}
3801 	spin_unlock_irq(&conn->lock);
3802 
3803 	switch (nlh->nlmsg_type) {
3804 	case ISCSI_UEVENT_BIND_CONN:
3805 		session = iscsi_session_lookup(ev->u.b_conn.sid);
3806 		if (!session) {
3807 			err = -EINVAL;
3808 			break;
3809 		}
3810 
3811 		ev->r.retcode =	transport->bind_conn(session, conn,
3812 						ev->u.b_conn.transport_eph,
3813 						ev->u.b_conn.is_leading);
3814 		if (!ev->r.retcode)
3815 			WRITE_ONCE(conn->state, ISCSI_CONN_BOUND);
3816 
3817 		if (ev->r.retcode || !transport->ep_connect)
3818 			break;
3819 
3820 		ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3821 		if (ep) {
3822 			ep->conn = conn;
3823 			conn->ep = ep;
3824 			iscsi_put_endpoint(ep);
3825 		} else {
3826 			err = -ENOTCONN;
3827 			iscsi_cls_conn_printk(KERN_ERR, conn,
3828 					      "Could not set ep conn binding\n");
3829 		}
3830 		break;
3831 	case ISCSI_UEVENT_START_CONN:
3832 		ev->r.retcode = transport->start_conn(conn);
3833 		if (!ev->r.retcode)
3834 			WRITE_ONCE(conn->state, ISCSI_CONN_UP);
3835 
3836 		break;
3837 	case ISCSI_UEVENT_SEND_PDU:
3838 		pdu_len = nlh->nlmsg_len - sizeof(*nlh) - sizeof(*ev);
3839 
3840 		if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3841 		    (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3842 			err = -EINVAL;
3843 			break;
3844 		}
3845 
3846 		ev->r.retcode =	transport->send_pdu(conn,
3847 				(struct iscsi_hdr *)((char *)ev + sizeof(*ev)),
3848 				(char *)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3849 				ev->u.send_pdu.data_size);
3850 		break;
3851 	default:
3852 		err = -ENOSYS;
3853 	}
3854 
3855 	mutex_unlock(&conn->ep_mutex);
3856 	return err;
3857 }
3858 
3859 static int
3860 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3861 {
3862 	int err = 0;
3863 	u32 portid;
3864 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3865 	struct iscsi_transport *transport = NULL;
3866 	struct iscsi_internal *priv;
3867 	struct iscsi_cls_session *session;
3868 	struct iscsi_endpoint *ep = NULL;
3869 
3870 	if (!netlink_capable(skb, CAP_SYS_ADMIN))
3871 		return -EPERM;
3872 
3873 	if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3874 		*group = ISCSI_NL_GRP_UIP;
3875 	else
3876 		*group = ISCSI_NL_GRP_ISCSID;
3877 
3878 	priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3879 	if (!priv)
3880 		return -EINVAL;
3881 	transport = priv->iscsi_transport;
3882 
3883 	if (!try_module_get(transport->owner))
3884 		return -EINVAL;
3885 
3886 	portid = NETLINK_CB(skb).portid;
3887 
3888 	switch (nlh->nlmsg_type) {
3889 	case ISCSI_UEVENT_CREATE_SESSION:
3890 		err = iscsi_if_create_session(priv, ep, ev,
3891 					      portid,
3892 					      ev->u.c_session.initial_cmdsn,
3893 					      ev->u.c_session.cmds_max,
3894 					      ev->u.c_session.queue_depth);
3895 		break;
3896 	case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3897 		ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3898 		if (!ep) {
3899 			err = -EINVAL;
3900 			break;
3901 		}
3902 
3903 		err = iscsi_if_create_session(priv, ep, ev,
3904 					portid,
3905 					ev->u.c_bound_session.initial_cmdsn,
3906 					ev->u.c_bound_session.cmds_max,
3907 					ev->u.c_bound_session.queue_depth);
3908 		iscsi_put_endpoint(ep);
3909 		break;
3910 	case ISCSI_UEVENT_DESTROY_SESSION:
3911 		session = iscsi_session_lookup(ev->u.d_session.sid);
3912 		if (!session)
3913 			err = -EINVAL;
3914 		else if (iscsi_session_has_conns(ev->u.d_session.sid))
3915 			err = -EBUSY;
3916 		else
3917 			transport->destroy_session(session);
3918 		break;
3919 	case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3920 		session = iscsi_session_lookup(ev->u.d_session.sid);
3921 		if (!session)
3922 			err = -EINVAL;
3923 		else if (iscsi_session_has_conns(ev->u.d_session.sid))
3924 			err = -EBUSY;
3925 		else {
3926 			unsigned long flags;
3927 
3928 			/* Prevent this session from being found again */
3929 			spin_lock_irqsave(&sesslock, flags);
3930 			list_del_init(&session->sess_list);
3931 			spin_unlock_irqrestore(&sesslock, flags);
3932 
3933 			queue_work(system_unbound_wq, &session->destroy_work);
3934 		}
3935 		break;
3936 	case ISCSI_UEVENT_UNBIND_SESSION:
3937 		session = iscsi_session_lookup(ev->u.d_session.sid);
3938 		if (session)
3939 			queue_work(session->workq, &session->unbind_work);
3940 		else
3941 			err = -EINVAL;
3942 		break;
3943 	case ISCSI_UEVENT_SET_PARAM:
3944 		err = iscsi_set_param(transport, ev);
3945 		break;
3946 	case ISCSI_UEVENT_CREATE_CONN:
3947 	case ISCSI_UEVENT_DESTROY_CONN:
3948 	case ISCSI_UEVENT_STOP_CONN:
3949 	case ISCSI_UEVENT_START_CONN:
3950 	case ISCSI_UEVENT_BIND_CONN:
3951 	case ISCSI_UEVENT_SEND_PDU:
3952 		err = iscsi_if_transport_conn(transport, nlh);
3953 		break;
3954 	case ISCSI_UEVENT_GET_STATS:
3955 		err = iscsi_if_get_stats(transport, nlh);
3956 		break;
3957 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3958 	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3959 	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3960 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3961 		err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3962 		break;
3963 	case ISCSI_UEVENT_TGT_DSCVR:
3964 		err = iscsi_tgt_dscvr(transport, ev);
3965 		break;
3966 	case ISCSI_UEVENT_SET_HOST_PARAM:
3967 		err = iscsi_set_host_param(transport, ev);
3968 		break;
3969 	case ISCSI_UEVENT_PATH_UPDATE:
3970 		err = iscsi_set_path(transport, ev);
3971 		break;
3972 	case ISCSI_UEVENT_SET_IFACE_PARAMS:
3973 		err = iscsi_set_iface_params(transport, ev,
3974 					     nlmsg_attrlen(nlh, sizeof(*ev)));
3975 		break;
3976 	case ISCSI_UEVENT_PING:
3977 		err = iscsi_send_ping(transport, ev);
3978 		break;
3979 	case ISCSI_UEVENT_GET_CHAP:
3980 		err = iscsi_get_chap(transport, nlh);
3981 		break;
3982 	case ISCSI_UEVENT_DELETE_CHAP:
3983 		err = iscsi_delete_chap(transport, ev);
3984 		break;
3985 	case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3986 		err = iscsi_set_flashnode_param(transport, ev,
3987 						nlmsg_attrlen(nlh,
3988 							      sizeof(*ev)));
3989 		break;
3990 	case ISCSI_UEVENT_NEW_FLASHNODE:
3991 		err = iscsi_new_flashnode(transport, ev,
3992 					  nlmsg_attrlen(nlh, sizeof(*ev)));
3993 		break;
3994 	case ISCSI_UEVENT_DEL_FLASHNODE:
3995 		err = iscsi_del_flashnode(transport, ev);
3996 		break;
3997 	case ISCSI_UEVENT_LOGIN_FLASHNODE:
3998 		err = iscsi_login_flashnode(transport, ev);
3999 		break;
4000 	case ISCSI_UEVENT_LOGOUT_FLASHNODE:
4001 		err = iscsi_logout_flashnode(transport, ev);
4002 		break;
4003 	case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
4004 		err = iscsi_logout_flashnode_sid(transport, ev);
4005 		break;
4006 	case ISCSI_UEVENT_SET_CHAP:
4007 		err = iscsi_set_chap(transport, ev,
4008 				     nlmsg_attrlen(nlh, sizeof(*ev)));
4009 		break;
4010 	case ISCSI_UEVENT_GET_HOST_STATS:
4011 		err = iscsi_get_host_stats(transport, nlh);
4012 		break;
4013 	default:
4014 		err = -ENOSYS;
4015 		break;
4016 	}
4017 
4018 	module_put(transport->owner);
4019 	return err;
4020 }
4021 
4022 /*
4023  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
4024  * Malformed skbs with wrong lengths or invalid creds are not processed.
4025  */
4026 static void
4027 iscsi_if_rx(struct sk_buff *skb)
4028 {
4029 	u32 portid = NETLINK_CB(skb).portid;
4030 
4031 	mutex_lock(&rx_queue_mutex);
4032 	while (skb->len >= NLMSG_HDRLEN) {
4033 		int err;
4034 		uint32_t rlen;
4035 		struct nlmsghdr	*nlh;
4036 		struct iscsi_uevent *ev;
4037 		uint32_t group;
4038 		int retries = ISCSI_SEND_MAX_ALLOWED;
4039 
4040 		nlh = nlmsg_hdr(skb);
4041 		if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
4042 		    skb->len < nlh->nlmsg_len) {
4043 			break;
4044 		}
4045 
4046 		ev = nlmsg_data(nlh);
4047 		rlen = NLMSG_ALIGN(nlh->nlmsg_len);
4048 		if (rlen > skb->len)
4049 			rlen = skb->len;
4050 
4051 		err = iscsi_if_recv_msg(skb, nlh, &group);
4052 		if (err) {
4053 			ev->type = ISCSI_KEVENT_IF_ERROR;
4054 			ev->iferror = err;
4055 		}
4056 		do {
4057 			/*
4058 			 * special case for GET_STATS:
4059 			 * on success - sending reply and stats from
4060 			 * inside of if_recv_msg(),
4061 			 * on error - fall through.
4062 			 */
4063 			if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
4064 				break;
4065 			if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
4066 				break;
4067 			err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
4068 						  ev, sizeof(*ev));
4069 			if (err == -EAGAIN && --retries < 0) {
4070 				printk(KERN_WARNING "Send reply failed, error %d\n", err);
4071 				break;
4072 			}
4073 		} while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
4074 		skb_pull(skb, rlen);
4075 	}
4076 	mutex_unlock(&rx_queue_mutex);
4077 }
4078 
4079 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)		\
4080 struct device_attribute dev_attr_##_prefix##_##_name =	\
4081 	__ATTR(_name,_mode,_show,_store)
4082 
4083 /*
4084  * iSCSI connection attrs
4085  */
4086 #define iscsi_conn_attr_show(param)					\
4087 static ssize_t								\
4088 show_conn_param_##param(struct device *dev, 				\
4089 			struct device_attribute *attr, char *buf)	\
4090 {									\
4091 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);	\
4092 	struct iscsi_transport *t = conn->transport;			\
4093 	return t->get_conn_param(conn, param, buf);			\
4094 }
4095 
4096 #define iscsi_conn_attr(field, param)					\
4097 	iscsi_conn_attr_show(param)					\
4098 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,	\
4099 			NULL);
4100 
4101 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
4102 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
4103 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
4104 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
4105 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
4106 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
4107 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
4108 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
4109 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
4110 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
4111 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
4112 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
4113 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
4114 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
4115 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
4116 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
4117 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
4118 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
4119 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
4120 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
4121 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
4122 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
4123 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
4124 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
4125 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
4126 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
4127 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
4128 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
4129 
4130 static const char *const connection_state_names[] = {
4131 	[ISCSI_CONN_UP] = "up",
4132 	[ISCSI_CONN_DOWN] = "down",
4133 	[ISCSI_CONN_FAILED] = "failed",
4134 	[ISCSI_CONN_BOUND] = "bound"
4135 };
4136 
4137 static ssize_t show_conn_state(struct device *dev,
4138 			       struct device_attribute *attr, char *buf)
4139 {
4140 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
4141 	const char *state = "unknown";
4142 	int conn_state = READ_ONCE(conn->state);
4143 
4144 	if (conn_state >= 0 &&
4145 	    conn_state < ARRAY_SIZE(connection_state_names))
4146 		state = connection_state_names[conn_state];
4147 
4148 	return sysfs_emit(buf, "%s\n", state);
4149 }
4150 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
4151 			NULL);
4152 
4153 #define iscsi_conn_ep_attr_show(param)					\
4154 static ssize_t show_conn_ep_param_##param(struct device *dev,		\
4155 					  struct device_attribute *attr,\
4156 					  char *buf)			\
4157 {									\
4158 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);	\
4159 	struct iscsi_transport *t = conn->transport;			\
4160 	struct iscsi_endpoint *ep;					\
4161 	ssize_t rc;							\
4162 									\
4163 	/*								\
4164 	 * Need to make sure ep_disconnect does not free the LLD's	\
4165 	 * interconnect resources while we are trying to read them.	\
4166 	 */								\
4167 	mutex_lock(&conn->ep_mutex);					\
4168 	ep = conn->ep;							\
4169 	if (!ep && t->ep_connect) {					\
4170 		mutex_unlock(&conn->ep_mutex);				\
4171 		return -ENOTCONN;					\
4172 	}								\
4173 									\
4174 	if (ep)								\
4175 		rc = t->get_ep_param(ep, param, buf);			\
4176 	else								\
4177 		rc = t->get_conn_param(conn, param, buf);		\
4178 	mutex_unlock(&conn->ep_mutex);					\
4179 	return rc;							\
4180 }
4181 
4182 #define iscsi_conn_ep_attr(field, param)				\
4183 	iscsi_conn_ep_attr_show(param)					\
4184 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,				\
4185 			show_conn_ep_param_##param, NULL);
4186 
4187 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4188 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4189 
4190 static struct attribute *iscsi_conn_attrs[] = {
4191 	&dev_attr_conn_max_recv_dlength.attr,
4192 	&dev_attr_conn_max_xmit_dlength.attr,
4193 	&dev_attr_conn_header_digest.attr,
4194 	&dev_attr_conn_data_digest.attr,
4195 	&dev_attr_conn_ifmarker.attr,
4196 	&dev_attr_conn_ofmarker.attr,
4197 	&dev_attr_conn_address.attr,
4198 	&dev_attr_conn_port.attr,
4199 	&dev_attr_conn_exp_statsn.attr,
4200 	&dev_attr_conn_persistent_address.attr,
4201 	&dev_attr_conn_persistent_port.attr,
4202 	&dev_attr_conn_ping_tmo.attr,
4203 	&dev_attr_conn_recv_tmo.attr,
4204 	&dev_attr_conn_local_port.attr,
4205 	&dev_attr_conn_statsn.attr,
4206 	&dev_attr_conn_keepalive_tmo.attr,
4207 	&dev_attr_conn_max_segment_size.attr,
4208 	&dev_attr_conn_tcp_timestamp_stat.attr,
4209 	&dev_attr_conn_tcp_wsf_disable.attr,
4210 	&dev_attr_conn_tcp_nagle_disable.attr,
4211 	&dev_attr_conn_tcp_timer_scale.attr,
4212 	&dev_attr_conn_tcp_timestamp_enable.attr,
4213 	&dev_attr_conn_fragment_disable.attr,
4214 	&dev_attr_conn_ipv4_tos.attr,
4215 	&dev_attr_conn_ipv6_traffic_class.attr,
4216 	&dev_attr_conn_ipv6_flow_label.attr,
4217 	&dev_attr_conn_is_fw_assigned_ipv6.attr,
4218 	&dev_attr_conn_tcp_xmit_wsf.attr,
4219 	&dev_attr_conn_tcp_recv_wsf.attr,
4220 	&dev_attr_conn_local_ipaddr.attr,
4221 	&dev_attr_conn_state.attr,
4222 	NULL,
4223 };
4224 
4225 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4226 					 struct attribute *attr, int i)
4227 {
4228 	struct device *cdev = container_of(kobj, struct device, kobj);
4229 	struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4230 	struct iscsi_transport *t = conn->transport;
4231 	int param;
4232 
4233 	if (attr == &dev_attr_conn_max_recv_dlength.attr)
4234 		param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4235 	else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4236 		param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4237 	else if (attr == &dev_attr_conn_header_digest.attr)
4238 		param = ISCSI_PARAM_HDRDGST_EN;
4239 	else if (attr == &dev_attr_conn_data_digest.attr)
4240 		param = ISCSI_PARAM_DATADGST_EN;
4241 	else if (attr == &dev_attr_conn_ifmarker.attr)
4242 		param = ISCSI_PARAM_IFMARKER_EN;
4243 	else if (attr == &dev_attr_conn_ofmarker.attr)
4244 		param = ISCSI_PARAM_OFMARKER_EN;
4245 	else if (attr == &dev_attr_conn_address.attr)
4246 		param = ISCSI_PARAM_CONN_ADDRESS;
4247 	else if (attr == &dev_attr_conn_port.attr)
4248 		param = ISCSI_PARAM_CONN_PORT;
4249 	else if (attr == &dev_attr_conn_exp_statsn.attr)
4250 		param = ISCSI_PARAM_EXP_STATSN;
4251 	else if (attr == &dev_attr_conn_persistent_address.attr)
4252 		param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4253 	else if (attr == &dev_attr_conn_persistent_port.attr)
4254 		param = ISCSI_PARAM_PERSISTENT_PORT;
4255 	else if (attr == &dev_attr_conn_ping_tmo.attr)
4256 		param = ISCSI_PARAM_PING_TMO;
4257 	else if (attr == &dev_attr_conn_recv_tmo.attr)
4258 		param = ISCSI_PARAM_RECV_TMO;
4259 	else if (attr == &dev_attr_conn_local_port.attr)
4260 		param = ISCSI_PARAM_LOCAL_PORT;
4261 	else if (attr == &dev_attr_conn_statsn.attr)
4262 		param = ISCSI_PARAM_STATSN;
4263 	else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4264 		param = ISCSI_PARAM_KEEPALIVE_TMO;
4265 	else if (attr == &dev_attr_conn_max_segment_size.attr)
4266 		param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4267 	else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4268 		param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4269 	else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4270 		param = ISCSI_PARAM_TCP_WSF_DISABLE;
4271 	else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4272 		param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4273 	else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4274 		param = ISCSI_PARAM_TCP_TIMER_SCALE;
4275 	else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4276 		param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4277 	else if (attr == &dev_attr_conn_fragment_disable.attr)
4278 		param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4279 	else if (attr == &dev_attr_conn_ipv4_tos.attr)
4280 		param = ISCSI_PARAM_IPV4_TOS;
4281 	else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4282 		param = ISCSI_PARAM_IPV6_TC;
4283 	else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4284 		param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4285 	else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4286 		param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4287 	else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4288 		param = ISCSI_PARAM_TCP_XMIT_WSF;
4289 	else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4290 		param = ISCSI_PARAM_TCP_RECV_WSF;
4291 	else if (attr == &dev_attr_conn_local_ipaddr.attr)
4292 		param = ISCSI_PARAM_LOCAL_IPADDR;
4293 	else if (attr == &dev_attr_conn_state.attr)
4294 		return S_IRUGO;
4295 	else {
4296 		WARN_ONCE(1, "Invalid conn attr");
4297 		return 0;
4298 	}
4299 
4300 	return t->attr_is_visible(ISCSI_PARAM, param);
4301 }
4302 
4303 static struct attribute_group iscsi_conn_group = {
4304 	.attrs = iscsi_conn_attrs,
4305 	.is_visible = iscsi_conn_attr_is_visible,
4306 };
4307 
4308 /*
4309  * iSCSI session attrs
4310  */
4311 #define iscsi_session_attr_show(param, perm)				\
4312 static ssize_t								\
4313 show_session_param_##param(struct device *dev,				\
4314 			   struct device_attribute *attr, char *buf)	\
4315 {									\
4316 	struct iscsi_cls_session *session = 				\
4317 		iscsi_dev_to_session(dev->parent);			\
4318 	struct iscsi_transport *t = session->transport;			\
4319 									\
4320 	if (perm && !capable(CAP_SYS_ADMIN))				\
4321 		return -EACCES;						\
4322 	return t->get_session_param(session, param, buf);		\
4323 }
4324 
4325 #define iscsi_session_attr(field, param, perm)				\
4326 	iscsi_session_attr_show(param, perm)				\
4327 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4328 			NULL);
4329 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4330 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4331 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4332 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4333 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4334 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4335 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4336 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4337 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4338 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4339 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4340 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4341 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4342 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4343 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4344 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4345 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4346 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4347 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4348 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4349 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4350 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4351 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4352 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4353 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4354 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4355 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4356 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4357 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4358 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4359 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4360 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4361 iscsi_session_attr(discovery_auth_optional,
4362 		   ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4363 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4364 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4365 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4366 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4367 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4368 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4369 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4370 
4371 static ssize_t
4372 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4373 			char *buf)
4374 {
4375 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4376 	return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4377 }
4378 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4379 			NULL);
4380 static ssize_t
4381 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4382 			char *buf)
4383 {
4384 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4385 	return sysfs_emit(buf, "%d\n", session->creator);
4386 }
4387 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4388 			NULL);
4389 static ssize_t
4390 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4391 			    char *buf)
4392 {
4393 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4394 	return sysfs_emit(buf, "%d\n", session->target_id);
4395 }
4396 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4397 			show_priv_session_target_id, NULL);
4398 
4399 #define iscsi_priv_session_attr_show(field, format)			\
4400 static ssize_t								\
4401 show_priv_session_##field(struct device *dev, 				\
4402 			  struct device_attribute *attr, char *buf)	\
4403 {									\
4404 	struct iscsi_cls_session *session = 				\
4405 			iscsi_dev_to_session(dev->parent);		\
4406 	if (session->field == -1)					\
4407 		return sysfs_emit(buf, "off\n");			\
4408 	return sysfs_emit(buf, format"\n", session->field);		\
4409 }
4410 
4411 #define iscsi_priv_session_attr_store(field)				\
4412 static ssize_t								\
4413 store_priv_session_##field(struct device *dev,				\
4414 			   struct device_attribute *attr,		\
4415 			   const char *buf, size_t count)		\
4416 {									\
4417 	int val;							\
4418 	char *cp;							\
4419 	struct iscsi_cls_session *session =				\
4420 		iscsi_dev_to_session(dev->parent);			\
4421 	if ((session->state == ISCSI_SESSION_FREE) ||			\
4422 	    (session->state == ISCSI_SESSION_FAILED))			\
4423 		return -EBUSY;						\
4424 	if (strncmp(buf, "off", 3) == 0) {				\
4425 		session->field = -1;					\
4426 		session->field##_sysfs_override = true;			\
4427 	} else {							\
4428 		val = simple_strtoul(buf, &cp, 0);			\
4429 		if (*cp != '\0' && *cp != '\n')				\
4430 			return -EINVAL;					\
4431 		session->field = val;					\
4432 		session->field##_sysfs_override = true;			\
4433 	}								\
4434 	return count;							\
4435 }
4436 
4437 #define iscsi_priv_session_rw_attr(field, format)			\
4438 	iscsi_priv_session_attr_show(field, format)			\
4439 	iscsi_priv_session_attr_store(field)				\
4440 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,		\
4441 			show_priv_session_##field,			\
4442 			store_priv_session_##field)
4443 
4444 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4445 
4446 static struct attribute *iscsi_session_attrs[] = {
4447 	&dev_attr_sess_initial_r2t.attr,
4448 	&dev_attr_sess_max_outstanding_r2t.attr,
4449 	&dev_attr_sess_immediate_data.attr,
4450 	&dev_attr_sess_first_burst_len.attr,
4451 	&dev_attr_sess_max_burst_len.attr,
4452 	&dev_attr_sess_data_pdu_in_order.attr,
4453 	&dev_attr_sess_data_seq_in_order.attr,
4454 	&dev_attr_sess_erl.attr,
4455 	&dev_attr_sess_targetname.attr,
4456 	&dev_attr_sess_tpgt.attr,
4457 	&dev_attr_sess_password.attr,
4458 	&dev_attr_sess_password_in.attr,
4459 	&dev_attr_sess_username.attr,
4460 	&dev_attr_sess_username_in.attr,
4461 	&dev_attr_sess_fast_abort.attr,
4462 	&dev_attr_sess_abort_tmo.attr,
4463 	&dev_attr_sess_lu_reset_tmo.attr,
4464 	&dev_attr_sess_tgt_reset_tmo.attr,
4465 	&dev_attr_sess_ifacename.attr,
4466 	&dev_attr_sess_initiatorname.attr,
4467 	&dev_attr_sess_targetalias.attr,
4468 	&dev_attr_sess_boot_root.attr,
4469 	&dev_attr_sess_boot_nic.attr,
4470 	&dev_attr_sess_boot_target.attr,
4471 	&dev_attr_priv_sess_recovery_tmo.attr,
4472 	&dev_attr_priv_sess_state.attr,
4473 	&dev_attr_priv_sess_creator.attr,
4474 	&dev_attr_sess_chap_out_idx.attr,
4475 	&dev_attr_sess_chap_in_idx.attr,
4476 	&dev_attr_priv_sess_target_id.attr,
4477 	&dev_attr_sess_auto_snd_tgt_disable.attr,
4478 	&dev_attr_sess_discovery_session.attr,
4479 	&dev_attr_sess_portal_type.attr,
4480 	&dev_attr_sess_chap_auth.attr,
4481 	&dev_attr_sess_discovery_logout.attr,
4482 	&dev_attr_sess_bidi_chap.attr,
4483 	&dev_attr_sess_discovery_auth_optional.attr,
4484 	&dev_attr_sess_def_time2wait.attr,
4485 	&dev_attr_sess_def_time2retain.attr,
4486 	&dev_attr_sess_isid.attr,
4487 	&dev_attr_sess_tsid.attr,
4488 	&dev_attr_sess_def_taskmgmt_tmo.attr,
4489 	&dev_attr_sess_discovery_parent_idx.attr,
4490 	&dev_attr_sess_discovery_parent_type.attr,
4491 	NULL,
4492 };
4493 
4494 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4495 					    struct attribute *attr, int i)
4496 {
4497 	struct device *cdev = container_of(kobj, struct device, kobj);
4498 	struct iscsi_cls_session *session = transport_class_to_session(cdev);
4499 	struct iscsi_transport *t = session->transport;
4500 	int param;
4501 
4502 	if (attr == &dev_attr_sess_initial_r2t.attr)
4503 		param = ISCSI_PARAM_INITIAL_R2T_EN;
4504 	else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4505 		param = ISCSI_PARAM_MAX_R2T;
4506 	else if (attr == &dev_attr_sess_immediate_data.attr)
4507 		param = ISCSI_PARAM_IMM_DATA_EN;
4508 	else if (attr == &dev_attr_sess_first_burst_len.attr)
4509 		param = ISCSI_PARAM_FIRST_BURST;
4510 	else if (attr == &dev_attr_sess_max_burst_len.attr)
4511 		param = ISCSI_PARAM_MAX_BURST;
4512 	else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4513 		param = ISCSI_PARAM_PDU_INORDER_EN;
4514 	else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4515 		param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4516 	else if (attr == &dev_attr_sess_erl.attr)
4517 		param = ISCSI_PARAM_ERL;
4518 	else if (attr == &dev_attr_sess_targetname.attr)
4519 		param = ISCSI_PARAM_TARGET_NAME;
4520 	else if (attr == &dev_attr_sess_tpgt.attr)
4521 		param = ISCSI_PARAM_TPGT;
4522 	else if (attr == &dev_attr_sess_chap_in_idx.attr)
4523 		param = ISCSI_PARAM_CHAP_IN_IDX;
4524 	else if (attr == &dev_attr_sess_chap_out_idx.attr)
4525 		param = ISCSI_PARAM_CHAP_OUT_IDX;
4526 	else if (attr == &dev_attr_sess_password.attr)
4527 		param = ISCSI_PARAM_USERNAME;
4528 	else if (attr == &dev_attr_sess_password_in.attr)
4529 		param = ISCSI_PARAM_USERNAME_IN;
4530 	else if (attr == &dev_attr_sess_username.attr)
4531 		param = ISCSI_PARAM_PASSWORD;
4532 	else if (attr == &dev_attr_sess_username_in.attr)
4533 		param = ISCSI_PARAM_PASSWORD_IN;
4534 	else if (attr == &dev_attr_sess_fast_abort.attr)
4535 		param = ISCSI_PARAM_FAST_ABORT;
4536 	else if (attr == &dev_attr_sess_abort_tmo.attr)
4537 		param = ISCSI_PARAM_ABORT_TMO;
4538 	else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4539 		param = ISCSI_PARAM_LU_RESET_TMO;
4540 	else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4541 		param = ISCSI_PARAM_TGT_RESET_TMO;
4542 	else if (attr == &dev_attr_sess_ifacename.attr)
4543 		param = ISCSI_PARAM_IFACE_NAME;
4544 	else if (attr == &dev_attr_sess_initiatorname.attr)
4545 		param = ISCSI_PARAM_INITIATOR_NAME;
4546 	else if (attr == &dev_attr_sess_targetalias.attr)
4547 		param = ISCSI_PARAM_TARGET_ALIAS;
4548 	else if (attr == &dev_attr_sess_boot_root.attr)
4549 		param = ISCSI_PARAM_BOOT_ROOT;
4550 	else if (attr == &dev_attr_sess_boot_nic.attr)
4551 		param = ISCSI_PARAM_BOOT_NIC;
4552 	else if (attr == &dev_attr_sess_boot_target.attr)
4553 		param = ISCSI_PARAM_BOOT_TARGET;
4554 	else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4555 		param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4556 	else if (attr == &dev_attr_sess_discovery_session.attr)
4557 		param = ISCSI_PARAM_DISCOVERY_SESS;
4558 	else if (attr == &dev_attr_sess_portal_type.attr)
4559 		param = ISCSI_PARAM_PORTAL_TYPE;
4560 	else if (attr == &dev_attr_sess_chap_auth.attr)
4561 		param = ISCSI_PARAM_CHAP_AUTH_EN;
4562 	else if (attr == &dev_attr_sess_discovery_logout.attr)
4563 		param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4564 	else if (attr == &dev_attr_sess_bidi_chap.attr)
4565 		param = ISCSI_PARAM_BIDI_CHAP_EN;
4566 	else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4567 		param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4568 	else if (attr == &dev_attr_sess_def_time2wait.attr)
4569 		param = ISCSI_PARAM_DEF_TIME2WAIT;
4570 	else if (attr == &dev_attr_sess_def_time2retain.attr)
4571 		param = ISCSI_PARAM_DEF_TIME2RETAIN;
4572 	else if (attr == &dev_attr_sess_isid.attr)
4573 		param = ISCSI_PARAM_ISID;
4574 	else if (attr == &dev_attr_sess_tsid.attr)
4575 		param = ISCSI_PARAM_TSID;
4576 	else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4577 		param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4578 	else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4579 		param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4580 	else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4581 		param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4582 	else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4583 		return S_IRUGO | S_IWUSR;
4584 	else if (attr == &dev_attr_priv_sess_state.attr)
4585 		return S_IRUGO;
4586 	else if (attr == &dev_attr_priv_sess_creator.attr)
4587 		return S_IRUGO;
4588 	else if (attr == &dev_attr_priv_sess_target_id.attr)
4589 		return S_IRUGO;
4590 	else {
4591 		WARN_ONCE(1, "Invalid session attr");
4592 		return 0;
4593 	}
4594 
4595 	return t->attr_is_visible(ISCSI_PARAM, param);
4596 }
4597 
4598 static struct attribute_group iscsi_session_group = {
4599 	.attrs = iscsi_session_attrs,
4600 	.is_visible = iscsi_session_attr_is_visible,
4601 };
4602 
4603 /*
4604  * iSCSI host attrs
4605  */
4606 #define iscsi_host_attr_show(param)					\
4607 static ssize_t								\
4608 show_host_param_##param(struct device *dev, 				\
4609 			struct device_attribute *attr, char *buf)	\
4610 {									\
4611 	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
4612 	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4613 	return priv->iscsi_transport->get_host_param(shost, param, buf); \
4614 }
4615 
4616 #define iscsi_host_attr(field, param)					\
4617 	iscsi_host_attr_show(param)					\
4618 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,	\
4619 			NULL);
4620 
4621 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4622 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4623 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4624 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4625 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4626 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4627 
4628 static struct attribute *iscsi_host_attrs[] = {
4629 	&dev_attr_host_netdev.attr,
4630 	&dev_attr_host_hwaddress.attr,
4631 	&dev_attr_host_ipaddress.attr,
4632 	&dev_attr_host_initiatorname.attr,
4633 	&dev_attr_host_port_state.attr,
4634 	&dev_attr_host_port_speed.attr,
4635 	NULL,
4636 };
4637 
4638 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4639 					 struct attribute *attr, int i)
4640 {
4641 	struct device *cdev = container_of(kobj, struct device, kobj);
4642 	struct Scsi_Host *shost = transport_class_to_shost(cdev);
4643 	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4644 	int param;
4645 
4646 	if (attr == &dev_attr_host_netdev.attr)
4647 		param = ISCSI_HOST_PARAM_NETDEV_NAME;
4648 	else if (attr == &dev_attr_host_hwaddress.attr)
4649 		param = ISCSI_HOST_PARAM_HWADDRESS;
4650 	else if (attr == &dev_attr_host_ipaddress.attr)
4651 		param = ISCSI_HOST_PARAM_IPADDRESS;
4652 	else if (attr == &dev_attr_host_initiatorname.attr)
4653 		param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4654 	else if (attr == &dev_attr_host_port_state.attr)
4655 		param = ISCSI_HOST_PARAM_PORT_STATE;
4656 	else if (attr == &dev_attr_host_port_speed.attr)
4657 		param = ISCSI_HOST_PARAM_PORT_SPEED;
4658 	else {
4659 		WARN_ONCE(1, "Invalid host attr");
4660 		return 0;
4661 	}
4662 
4663 	return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4664 }
4665 
4666 static struct attribute_group iscsi_host_group = {
4667 	.attrs = iscsi_host_attrs,
4668 	.is_visible = iscsi_host_attr_is_visible,
4669 };
4670 
4671 /* convert iscsi_port_speed values to ascii string name */
4672 static const struct {
4673 	enum iscsi_port_speed	value;
4674 	char			*name;
4675 } iscsi_port_speed_names[] = {
4676 	{ISCSI_PORT_SPEED_UNKNOWN,	"Unknown" },
4677 	{ISCSI_PORT_SPEED_10MBPS,	"10 Mbps" },
4678 	{ISCSI_PORT_SPEED_100MBPS,	"100 Mbps" },
4679 	{ISCSI_PORT_SPEED_1GBPS,	"1 Gbps" },
4680 	{ISCSI_PORT_SPEED_10GBPS,	"10 Gbps" },
4681 	{ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4682 	{ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4683 };
4684 
4685 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4686 {
4687 	int i;
4688 	char *speed = "Unknown!";
4689 	struct iscsi_cls_host *ihost = shost->shost_data;
4690 	uint32_t port_speed = ihost->port_speed;
4691 
4692 	for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4693 		if (iscsi_port_speed_names[i].value & port_speed) {
4694 			speed = iscsi_port_speed_names[i].name;
4695 			break;
4696 		}
4697 	}
4698 	return speed;
4699 }
4700 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4701 
4702 /* convert iscsi_port_state values to ascii string name */
4703 static const struct {
4704 	enum iscsi_port_state	value;
4705 	char			*name;
4706 } iscsi_port_state_names[] = {
4707 	{ISCSI_PORT_STATE_DOWN,		"LINK DOWN" },
4708 	{ISCSI_PORT_STATE_UP,		"LINK UP" },
4709 };
4710 
4711 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4712 {
4713 	int i;
4714 	char *state = "Unknown!";
4715 	struct iscsi_cls_host *ihost = shost->shost_data;
4716 	uint32_t port_state = ihost->port_state;
4717 
4718 	for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4719 		if (iscsi_port_state_names[i].value & port_state) {
4720 			state = iscsi_port_state_names[i].name;
4721 			break;
4722 		}
4723 	}
4724 	return state;
4725 }
4726 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4727 
4728 static int iscsi_session_match(struct attribute_container *cont,
4729 			   struct device *dev)
4730 {
4731 	struct iscsi_cls_session *session;
4732 	struct Scsi_Host *shost;
4733 	struct iscsi_internal *priv;
4734 
4735 	if (!iscsi_is_session_dev(dev))
4736 		return 0;
4737 
4738 	session = iscsi_dev_to_session(dev);
4739 	shost = iscsi_session_to_shost(session);
4740 	if (!shost->transportt)
4741 		return 0;
4742 
4743 	priv = to_iscsi_internal(shost->transportt);
4744 	if (priv->session_cont.ac.class != &iscsi_session_class.class)
4745 		return 0;
4746 
4747 	return &priv->session_cont.ac == cont;
4748 }
4749 
4750 static int iscsi_conn_match(struct attribute_container *cont,
4751 			   struct device *dev)
4752 {
4753 	struct iscsi_cls_session *session;
4754 	struct iscsi_cls_conn *conn;
4755 	struct Scsi_Host *shost;
4756 	struct iscsi_internal *priv;
4757 
4758 	if (!iscsi_is_conn_dev(dev))
4759 		return 0;
4760 
4761 	conn = iscsi_dev_to_conn(dev);
4762 	session = iscsi_dev_to_session(conn->dev.parent);
4763 	shost = iscsi_session_to_shost(session);
4764 
4765 	if (!shost->transportt)
4766 		return 0;
4767 
4768 	priv = to_iscsi_internal(shost->transportt);
4769 	if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4770 		return 0;
4771 
4772 	return &priv->conn_cont.ac == cont;
4773 }
4774 
4775 static int iscsi_host_match(struct attribute_container *cont,
4776 			    struct device *dev)
4777 {
4778 	struct Scsi_Host *shost;
4779 	struct iscsi_internal *priv;
4780 
4781 	if (!scsi_is_host_device(dev))
4782 		return 0;
4783 
4784 	shost = dev_to_shost(dev);
4785 	if (!shost->transportt  ||
4786 	    shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4787 		return 0;
4788 
4789         priv = to_iscsi_internal(shost->transportt);
4790         return &priv->t.host_attrs.ac == cont;
4791 }
4792 
4793 struct scsi_transport_template *
4794 iscsi_register_transport(struct iscsi_transport *tt)
4795 {
4796 	struct iscsi_internal *priv;
4797 	unsigned long flags;
4798 	int err;
4799 
4800 	BUG_ON(!tt);
4801 	WARN_ON(tt->ep_disconnect && !tt->unbind_conn);
4802 
4803 	priv = iscsi_if_transport_lookup(tt);
4804 	if (priv)
4805 		return NULL;
4806 
4807 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4808 	if (!priv)
4809 		return NULL;
4810 	INIT_LIST_HEAD(&priv->list);
4811 	priv->iscsi_transport = tt;
4812 	priv->t.user_scan = iscsi_user_scan;
4813 
4814 	priv->dev.class = &iscsi_transport_class;
4815 	dev_set_name(&priv->dev, "%s", tt->name);
4816 	err = device_register(&priv->dev);
4817 	if (err)
4818 		goto free_priv;
4819 
4820 	err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4821 	if (err)
4822 		goto unregister_dev;
4823 
4824 	/* host parameters */
4825 	priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4826 	priv->t.host_attrs.ac.match = iscsi_host_match;
4827 	priv->t.host_attrs.ac.grp = &iscsi_host_group;
4828 	priv->t.host_size = sizeof(struct iscsi_cls_host);
4829 	transport_container_register(&priv->t.host_attrs);
4830 
4831 	/* connection parameters */
4832 	priv->conn_cont.ac.class = &iscsi_connection_class.class;
4833 	priv->conn_cont.ac.match = iscsi_conn_match;
4834 	priv->conn_cont.ac.grp = &iscsi_conn_group;
4835 	transport_container_register(&priv->conn_cont);
4836 
4837 	/* session parameters */
4838 	priv->session_cont.ac.class = &iscsi_session_class.class;
4839 	priv->session_cont.ac.match = iscsi_session_match;
4840 	priv->session_cont.ac.grp = &iscsi_session_group;
4841 	transport_container_register(&priv->session_cont);
4842 
4843 	spin_lock_irqsave(&iscsi_transport_lock, flags);
4844 	list_add(&priv->list, &iscsi_transports);
4845 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4846 
4847 	printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4848 	return &priv->t;
4849 
4850 unregister_dev:
4851 	device_unregister(&priv->dev);
4852 	return NULL;
4853 free_priv:
4854 	kfree(priv);
4855 	return NULL;
4856 }
4857 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4858 
4859 void iscsi_unregister_transport(struct iscsi_transport *tt)
4860 {
4861 	struct iscsi_internal *priv;
4862 	unsigned long flags;
4863 
4864 	BUG_ON(!tt);
4865 
4866 	mutex_lock(&rx_queue_mutex);
4867 
4868 	priv = iscsi_if_transport_lookup(tt);
4869 	BUG_ON (!priv);
4870 
4871 	spin_lock_irqsave(&iscsi_transport_lock, flags);
4872 	list_del(&priv->list);
4873 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4874 
4875 	transport_container_unregister(&priv->conn_cont);
4876 	transport_container_unregister(&priv->session_cont);
4877 	transport_container_unregister(&priv->t.host_attrs);
4878 
4879 	sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4880 	device_unregister(&priv->dev);
4881 	mutex_unlock(&rx_queue_mutex);
4882 }
4883 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4884 
4885 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4886 		     struct device *dev, const char *fmt, ...)
4887 {
4888 	struct va_format vaf;
4889 	va_list args;
4890 
4891 	va_start(args, fmt);
4892 	vaf.fmt = fmt;
4893 	vaf.va = &args;
4894 	trace(dev, &vaf);
4895 	va_end(args);
4896 }
4897 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4898 
4899 static __init int iscsi_transport_init(void)
4900 {
4901 	int err;
4902 	struct netlink_kernel_cfg cfg = {
4903 		.groups	= 1,
4904 		.input	= iscsi_if_rx,
4905 	};
4906 	printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4907 		ISCSI_TRANSPORT_VERSION);
4908 
4909 	atomic_set(&iscsi_session_nr, 0);
4910 
4911 	err = class_register(&iscsi_transport_class);
4912 	if (err)
4913 		return err;
4914 
4915 	err = class_register(&iscsi_endpoint_class);
4916 	if (err)
4917 		goto unregister_transport_class;
4918 
4919 	err = class_register(&iscsi_iface_class);
4920 	if (err)
4921 		goto unregister_endpoint_class;
4922 
4923 	err = transport_class_register(&iscsi_host_class);
4924 	if (err)
4925 		goto unregister_iface_class;
4926 
4927 	err = transport_class_register(&iscsi_connection_class);
4928 	if (err)
4929 		goto unregister_host_class;
4930 
4931 	err = transport_class_register(&iscsi_session_class);
4932 	if (err)
4933 		goto unregister_conn_class;
4934 
4935 	err = bus_register(&iscsi_flashnode_bus);
4936 	if (err)
4937 		goto unregister_session_class;
4938 
4939 	nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4940 	if (!nls) {
4941 		err = -ENOBUFS;
4942 		goto unregister_flashnode_bus;
4943 	}
4944 
4945 	iscsi_conn_cleanup_workq = alloc_workqueue("%s",
4946 			WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
4947 			"iscsi_conn_cleanup");
4948 	if (!iscsi_conn_cleanup_workq) {
4949 		err = -ENOMEM;
4950 		goto release_nls;
4951 	}
4952 
4953 	return 0;
4954 
4955 release_nls:
4956 	netlink_kernel_release(nls);
4957 unregister_flashnode_bus:
4958 	bus_unregister(&iscsi_flashnode_bus);
4959 unregister_session_class:
4960 	transport_class_unregister(&iscsi_session_class);
4961 unregister_conn_class:
4962 	transport_class_unregister(&iscsi_connection_class);
4963 unregister_host_class:
4964 	transport_class_unregister(&iscsi_host_class);
4965 unregister_iface_class:
4966 	class_unregister(&iscsi_iface_class);
4967 unregister_endpoint_class:
4968 	class_unregister(&iscsi_endpoint_class);
4969 unregister_transport_class:
4970 	class_unregister(&iscsi_transport_class);
4971 	return err;
4972 }
4973 
4974 static void __exit iscsi_transport_exit(void)
4975 {
4976 	destroy_workqueue(iscsi_conn_cleanup_workq);
4977 	netlink_kernel_release(nls);
4978 	bus_unregister(&iscsi_flashnode_bus);
4979 	transport_class_unregister(&iscsi_connection_class);
4980 	transport_class_unregister(&iscsi_session_class);
4981 	transport_class_unregister(&iscsi_host_class);
4982 	class_unregister(&iscsi_endpoint_class);
4983 	class_unregister(&iscsi_iface_class);
4984 	class_unregister(&iscsi_transport_class);
4985 }
4986 
4987 module_init(iscsi_transport_init);
4988 module_exit(iscsi_transport_exit);
4989 
4990 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4991 	      "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4992 	      "Alex Aizman <itn780@yahoo.com>");
4993 MODULE_DESCRIPTION("iSCSI Transport Interface");
4994 MODULE_LICENSE("GPL");
4995 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4996 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
4997