xref: /linux/drivers/scsi/scsi_transport_iscsi.c (revision 0b8061c340b643e01da431dd60c75a41bb1d31ec)
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 /* Worker to perform connection failure on unresponsive connections
90  * completely in kernel space.
91  */
92 static void stop_conn_work_fn(struct work_struct *work);
93 static DECLARE_WORK(stop_conn_work, stop_conn_work_fn);
94 
95 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
96 static struct workqueue_struct *iscsi_eh_timer_workq;
97 
98 static struct workqueue_struct *iscsi_destroy_workq;
99 
100 static DEFINE_IDA(iscsi_sess_ida);
101 /*
102  * list of registered transports and lock that must
103  * be held while accessing list. The iscsi_transport_lock must
104  * be acquired after the rx_queue_mutex.
105  */
106 static LIST_HEAD(iscsi_transports);
107 static DEFINE_SPINLOCK(iscsi_transport_lock);
108 
109 #define to_iscsi_internal(tmpl) \
110 	container_of(tmpl, struct iscsi_internal, t)
111 
112 #define dev_to_iscsi_internal(_dev) \
113 	container_of(_dev, struct iscsi_internal, dev)
114 
115 static void iscsi_transport_release(struct device *dev)
116 {
117 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
118 	kfree(priv);
119 }
120 
121 /*
122  * iscsi_transport_class represents the iscsi_transports that are
123  * registered.
124  */
125 static struct class iscsi_transport_class = {
126 	.name = "iscsi_transport",
127 	.dev_release = iscsi_transport_release,
128 };
129 
130 static ssize_t
131 show_transport_handle(struct device *dev, struct device_attribute *attr,
132 		      char *buf)
133 {
134 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
135 
136 	if (!capable(CAP_SYS_ADMIN))
137 		return -EACCES;
138 	return sysfs_emit(buf, "%llu\n",
139 		  (unsigned long long)iscsi_handle(priv->iscsi_transport));
140 }
141 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
142 
143 #define show_transport_attr(name, format)				\
144 static ssize_t								\
145 show_transport_##name(struct device *dev, 				\
146 		      struct device_attribute *attr,char *buf)		\
147 {									\
148 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);	\
149 	return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
150 }									\
151 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
152 
153 show_transport_attr(caps, "0x%x");
154 
155 static struct attribute *iscsi_transport_attrs[] = {
156 	&dev_attr_handle.attr,
157 	&dev_attr_caps.attr,
158 	NULL,
159 };
160 
161 static struct attribute_group iscsi_transport_group = {
162 	.attrs = iscsi_transport_attrs,
163 };
164 
165 /*
166  * iSCSI endpoint attrs
167  */
168 #define iscsi_dev_to_endpoint(_dev) \
169 	container_of(_dev, struct iscsi_endpoint, dev)
170 
171 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)	\
172 struct device_attribute dev_attr_##_prefix##_##_name =	\
173         __ATTR(_name,_mode,_show,_store)
174 
175 static void iscsi_endpoint_release(struct device *dev)
176 {
177 	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
178 	kfree(ep);
179 }
180 
181 static struct class iscsi_endpoint_class = {
182 	.name = "iscsi_endpoint",
183 	.dev_release = iscsi_endpoint_release,
184 };
185 
186 static ssize_t
187 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
188 {
189 	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
190 	return sysfs_emit(buf, "%llu\n", (unsigned long long) ep->id);
191 }
192 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
193 
194 static struct attribute *iscsi_endpoint_attrs[] = {
195 	&dev_attr_ep_handle.attr,
196 	NULL,
197 };
198 
199 static struct attribute_group iscsi_endpoint_group = {
200 	.attrs = iscsi_endpoint_attrs,
201 };
202 
203 #define ISCSI_MAX_EPID -1
204 
205 static int iscsi_match_epid(struct device *dev, const void *data)
206 {
207 	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
208 	const uint64_t *epid = data;
209 
210 	return *epid == ep->id;
211 }
212 
213 struct iscsi_endpoint *
214 iscsi_create_endpoint(int dd_size)
215 {
216 	struct device *dev;
217 	struct iscsi_endpoint *ep;
218 	uint64_t id;
219 	int err;
220 
221 	for (id = 1; id < ISCSI_MAX_EPID; id++) {
222 		dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
223 					iscsi_match_epid);
224 		if (!dev)
225 			break;
226 		else
227 			put_device(dev);
228 	}
229 	if (id == ISCSI_MAX_EPID) {
230 		printk(KERN_ERR "Too many connections. Max supported %u\n",
231 		       ISCSI_MAX_EPID - 1);
232 		return NULL;
233 	}
234 
235 	ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
236 	if (!ep)
237 		return NULL;
238 
239 	ep->id = id;
240 	ep->dev.class = &iscsi_endpoint_class;
241 	dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
242 	err = device_register(&ep->dev);
243         if (err)
244                 goto free_ep;
245 
246 	err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
247 	if (err)
248 		goto unregister_dev;
249 
250 	if (dd_size)
251 		ep->dd_data = &ep[1];
252 	return ep;
253 
254 unregister_dev:
255 	device_unregister(&ep->dev);
256 	return NULL;
257 
258 free_ep:
259 	kfree(ep);
260 	return NULL;
261 }
262 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
263 
264 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
265 {
266 	sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
267 	device_unregister(&ep->dev);
268 }
269 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
270 
271 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
272 {
273 	struct iscsi_endpoint *ep;
274 	struct device *dev;
275 
276 	dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
277 				iscsi_match_epid);
278 	if (!dev)
279 		return NULL;
280 
281 	ep = iscsi_dev_to_endpoint(dev);
282 	/*
283 	 * we can drop this now because the interface will prevent
284 	 * removals and lookups from racing.
285 	 */
286 	put_device(dev);
287 	return ep;
288 }
289 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
290 
291 /*
292  * Interface to display network param to sysfs
293  */
294 
295 static void iscsi_iface_release(struct device *dev)
296 {
297 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
298 	struct device *parent = iface->dev.parent;
299 
300 	kfree(iface);
301 	put_device(parent);
302 }
303 
304 
305 static struct class iscsi_iface_class = {
306 	.name = "iscsi_iface",
307 	.dev_release = iscsi_iface_release,
308 };
309 
310 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)	\
311 struct device_attribute dev_attr_##_prefix##_##_name =		\
312 	__ATTR(_name, _mode, _show, _store)
313 
314 /* iface attrs show */
315 #define iscsi_iface_attr_show(type, name, param_type, param)		\
316 static ssize_t								\
317 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
318 		     char *buf)						\
319 {									\
320 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);		\
321 	struct iscsi_transport *t = iface->transport;			\
322 	return t->get_iface_param(iface, param_type, param, buf);	\
323 }									\
324 
325 #define iscsi_iface_net_attr(type, name, param)				\
326 	iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)	\
327 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
328 
329 #define iscsi_iface_attr(type, name, param)				\
330 	iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)	\
331 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
332 
333 /* generic read only ipv4 attribute */
334 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
335 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
336 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
337 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
338 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
339 		     ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
340 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
341 		     ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
342 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
343 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
344 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
345 		     ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
346 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
347 		     ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
348 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
349 		     ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
350 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
351 		     ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
352 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
353 		     ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
354 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
355 		     ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
356 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
357 		     ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
358 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
359 		     ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
360 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
361 		     ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
362 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
363 
364 /* generic read only ipv6 attribute */
365 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
366 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
367 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL);
368 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
369 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
370 		     ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
371 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
372 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
373 iscsi_iface_net_attr(ipv6_iface, link_local_state,
374 		     ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
375 iscsi_iface_net_attr(ipv6_iface, router_state,
376 		     ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
377 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
378 		     ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
379 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
380 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
381 iscsi_iface_net_attr(ipv6_iface, traffic_class,
382 		     ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
383 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
384 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
385 		     ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
386 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
387 		     ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
388 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
389 		     ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
390 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
391 		     ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
392 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
393 		     ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
394 
395 /* common read only iface attribute */
396 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
397 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
398 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
399 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
400 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
401 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
402 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
403 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
404 iscsi_iface_net_attr(iface, tcp_nagle_disable,
405 		     ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
406 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
407 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
408 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
409 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
410 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
411 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
412 
413 /* common iscsi specific settings attributes */
414 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
415 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
416 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
417 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
418 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
419 iscsi_iface_attr(iface, data_seq_in_order,
420 		 ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
421 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
422 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
423 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
424 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
425 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
426 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
427 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
428 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
429 iscsi_iface_attr(iface, discovery_auth_optional,
430 		 ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
431 iscsi_iface_attr(iface, discovery_logout,
432 		 ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
433 iscsi_iface_attr(iface, strict_login_comp_en,
434 		 ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
435 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
436 
437 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
438 					  struct attribute *attr, int i)
439 {
440 	struct device *dev = container_of(kobj, struct device, kobj);
441 	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
442 	struct iscsi_transport *t = iface->transport;
443 	int param;
444 	int param_type;
445 
446 	if (attr == &dev_attr_iface_enabled.attr)
447 		param = ISCSI_NET_PARAM_IFACE_ENABLE;
448 	else if (attr == &dev_attr_iface_vlan_id.attr)
449 		param = ISCSI_NET_PARAM_VLAN_ID;
450 	else if (attr == &dev_attr_iface_vlan_priority.attr)
451 		param = ISCSI_NET_PARAM_VLAN_PRIORITY;
452 	else if (attr == &dev_attr_iface_vlan_enabled.attr)
453 		param = ISCSI_NET_PARAM_VLAN_ENABLED;
454 	else if (attr == &dev_attr_iface_mtu.attr)
455 		param = ISCSI_NET_PARAM_MTU;
456 	else if (attr == &dev_attr_iface_port.attr)
457 		param = ISCSI_NET_PARAM_PORT;
458 	else if (attr == &dev_attr_iface_ipaddress_state.attr)
459 		param = ISCSI_NET_PARAM_IPADDR_STATE;
460 	else if (attr == &dev_attr_iface_delayed_ack_en.attr)
461 		param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
462 	else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
463 		param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
464 	else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
465 		param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
466 	else if (attr == &dev_attr_iface_tcp_wsf.attr)
467 		param = ISCSI_NET_PARAM_TCP_WSF;
468 	else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
469 		param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
470 	else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
471 		param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
472 	else if (attr == &dev_attr_iface_cache_id.attr)
473 		param = ISCSI_NET_PARAM_CACHE_ID;
474 	else if (attr == &dev_attr_iface_redirect_en.attr)
475 		param = ISCSI_NET_PARAM_REDIRECT_EN;
476 	else if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
477 		param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
478 	else if (attr == &dev_attr_iface_header_digest.attr)
479 		param = ISCSI_IFACE_PARAM_HDRDGST_EN;
480 	else if (attr == &dev_attr_iface_data_digest.attr)
481 		param = ISCSI_IFACE_PARAM_DATADGST_EN;
482 	else if (attr == &dev_attr_iface_immediate_data.attr)
483 		param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
484 	else if (attr == &dev_attr_iface_initial_r2t.attr)
485 		param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
486 	else if (attr == &dev_attr_iface_data_seq_in_order.attr)
487 		param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
488 	else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
489 		param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
490 	else if (attr == &dev_attr_iface_erl.attr)
491 		param = ISCSI_IFACE_PARAM_ERL;
492 	else if (attr == &dev_attr_iface_max_recv_dlength.attr)
493 		param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
494 	else if (attr == &dev_attr_iface_first_burst_len.attr)
495 		param = ISCSI_IFACE_PARAM_FIRST_BURST;
496 	else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
497 		param = ISCSI_IFACE_PARAM_MAX_R2T;
498 	else if (attr == &dev_attr_iface_max_burst_len.attr)
499 		param = ISCSI_IFACE_PARAM_MAX_BURST;
500 	else if (attr == &dev_attr_iface_chap_auth.attr)
501 		param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
502 	else if (attr == &dev_attr_iface_bidi_chap.attr)
503 		param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
504 	else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
505 		param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
506 	else if (attr == &dev_attr_iface_discovery_logout.attr)
507 		param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
508 	else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
509 		param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
510 	else if (attr == &dev_attr_iface_initiator_name.attr)
511 		param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
512 	else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
513 		if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
514 			param = ISCSI_NET_PARAM_IPV4_ADDR;
515 		else if (attr == &dev_attr_ipv4_iface_gateway.attr)
516 			param = ISCSI_NET_PARAM_IPV4_GW;
517 		else if (attr == &dev_attr_ipv4_iface_subnet.attr)
518 			param = ISCSI_NET_PARAM_IPV4_SUBNET;
519 		else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
520 			param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
521 		else if (attr ==
522 			 &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
523 			param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
524 		else if (attr ==
525 			 &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
526 			param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
527 		else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
528 			param = ISCSI_NET_PARAM_IPV4_TOS_EN;
529 		else if (attr == &dev_attr_ipv4_iface_tos.attr)
530 			param = ISCSI_NET_PARAM_IPV4_TOS;
531 		else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
532 			param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
533 		else if (attr ==
534 			 &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
535 			param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
536 		else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
537 			param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
538 		else if (attr ==
539 			 &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
540 			param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
541 		else if (attr ==
542 			 &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
543 			param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
544 		else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
545 			param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
546 		else if (attr ==
547 			 &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
548 			param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
549 		else if (attr ==
550 			 &dev_attr_ipv4_iface_fragment_disable.attr)
551 			param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
552 		else if (attr ==
553 			 &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
554 			param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
555 		else if (attr == &dev_attr_ipv4_iface_ttl.attr)
556 			param = ISCSI_NET_PARAM_IPV4_TTL;
557 		else
558 			return 0;
559 	} else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
560 		if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
561 			param = ISCSI_NET_PARAM_IPV6_ADDR;
562 		else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
563 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
564 		else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
565 			param = ISCSI_NET_PARAM_IPV6_ROUTER;
566 		else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
567 			param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
568 		else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
569 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
570 		else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
571 			param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
572 		else if (attr == &dev_attr_ipv6_iface_router_state.attr)
573 			param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
574 		else if (attr ==
575 			 &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
576 			param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
577 		else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
578 			param = ISCSI_NET_PARAM_IPV6_MLD_EN;
579 		else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
580 			param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
581 		else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
582 			param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
583 		else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
584 			param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
585 		else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
586 			param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
587 		else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
588 			param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
589 		else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
590 			param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
591 		else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
592 			param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
593 		else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
594 			param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
595 		else
596 			return 0;
597 	} else {
598 		WARN_ONCE(1, "Invalid iface attr");
599 		return 0;
600 	}
601 
602 	switch (param) {
603 	case ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO:
604 	case ISCSI_IFACE_PARAM_HDRDGST_EN:
605 	case ISCSI_IFACE_PARAM_DATADGST_EN:
606 	case ISCSI_IFACE_PARAM_IMM_DATA_EN:
607 	case ISCSI_IFACE_PARAM_INITIAL_R2T_EN:
608 	case ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN:
609 	case ISCSI_IFACE_PARAM_PDU_INORDER_EN:
610 	case ISCSI_IFACE_PARAM_ERL:
611 	case ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH:
612 	case ISCSI_IFACE_PARAM_FIRST_BURST:
613 	case ISCSI_IFACE_PARAM_MAX_R2T:
614 	case ISCSI_IFACE_PARAM_MAX_BURST:
615 	case ISCSI_IFACE_PARAM_CHAP_AUTH_EN:
616 	case ISCSI_IFACE_PARAM_BIDI_CHAP_EN:
617 	case ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL:
618 	case ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN:
619 	case ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN:
620 	case ISCSI_IFACE_PARAM_INITIATOR_NAME:
621 		param_type = ISCSI_IFACE_PARAM;
622 		break;
623 	default:
624 		param_type = ISCSI_NET_PARAM;
625 	}
626 
627 	return t->attr_is_visible(param_type, param);
628 }
629 
630 static struct attribute *iscsi_iface_attrs[] = {
631 	&dev_attr_iface_enabled.attr,
632 	&dev_attr_iface_vlan_id.attr,
633 	&dev_attr_iface_vlan_priority.attr,
634 	&dev_attr_iface_vlan_enabled.attr,
635 	&dev_attr_ipv4_iface_ipaddress.attr,
636 	&dev_attr_ipv4_iface_gateway.attr,
637 	&dev_attr_ipv4_iface_subnet.attr,
638 	&dev_attr_ipv4_iface_bootproto.attr,
639 	&dev_attr_ipv6_iface_ipaddress.attr,
640 	&dev_attr_ipv6_iface_link_local_addr.attr,
641 	&dev_attr_ipv6_iface_router_addr.attr,
642 	&dev_attr_ipv6_iface_ipaddr_autocfg.attr,
643 	&dev_attr_ipv6_iface_link_local_autocfg.attr,
644 	&dev_attr_iface_mtu.attr,
645 	&dev_attr_iface_port.attr,
646 	&dev_attr_iface_ipaddress_state.attr,
647 	&dev_attr_iface_delayed_ack_en.attr,
648 	&dev_attr_iface_tcp_nagle_disable.attr,
649 	&dev_attr_iface_tcp_wsf_disable.attr,
650 	&dev_attr_iface_tcp_wsf.attr,
651 	&dev_attr_iface_tcp_timer_scale.attr,
652 	&dev_attr_iface_tcp_timestamp_en.attr,
653 	&dev_attr_iface_cache_id.attr,
654 	&dev_attr_iface_redirect_en.attr,
655 	&dev_attr_iface_def_taskmgmt_tmo.attr,
656 	&dev_attr_iface_header_digest.attr,
657 	&dev_attr_iface_data_digest.attr,
658 	&dev_attr_iface_immediate_data.attr,
659 	&dev_attr_iface_initial_r2t.attr,
660 	&dev_attr_iface_data_seq_in_order.attr,
661 	&dev_attr_iface_data_pdu_in_order.attr,
662 	&dev_attr_iface_erl.attr,
663 	&dev_attr_iface_max_recv_dlength.attr,
664 	&dev_attr_iface_first_burst_len.attr,
665 	&dev_attr_iface_max_outstanding_r2t.attr,
666 	&dev_attr_iface_max_burst_len.attr,
667 	&dev_attr_iface_chap_auth.attr,
668 	&dev_attr_iface_bidi_chap.attr,
669 	&dev_attr_iface_discovery_auth_optional.attr,
670 	&dev_attr_iface_discovery_logout.attr,
671 	&dev_attr_iface_strict_login_comp_en.attr,
672 	&dev_attr_iface_initiator_name.attr,
673 	&dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
674 	&dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
675 	&dev_attr_ipv4_iface_tos_en.attr,
676 	&dev_attr_ipv4_iface_tos.attr,
677 	&dev_attr_ipv4_iface_grat_arp_en.attr,
678 	&dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
679 	&dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
680 	&dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
681 	&dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
682 	&dev_attr_ipv4_iface_dhcp_vendor_id.attr,
683 	&dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
684 	&dev_attr_ipv4_iface_fragment_disable.attr,
685 	&dev_attr_ipv4_iface_incoming_forwarding_en.attr,
686 	&dev_attr_ipv4_iface_ttl.attr,
687 	&dev_attr_ipv6_iface_link_local_state.attr,
688 	&dev_attr_ipv6_iface_router_state.attr,
689 	&dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
690 	&dev_attr_ipv6_iface_mld_en.attr,
691 	&dev_attr_ipv6_iface_flow_label.attr,
692 	&dev_attr_ipv6_iface_traffic_class.attr,
693 	&dev_attr_ipv6_iface_hop_limit.attr,
694 	&dev_attr_ipv6_iface_nd_reachable_tmo.attr,
695 	&dev_attr_ipv6_iface_nd_rexmit_time.attr,
696 	&dev_attr_ipv6_iface_nd_stale_tmo.attr,
697 	&dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
698 	&dev_attr_ipv6_iface_router_adv_link_mtu.attr,
699 	NULL,
700 };
701 
702 static struct attribute_group iscsi_iface_group = {
703 	.attrs = iscsi_iface_attrs,
704 	.is_visible = iscsi_iface_attr_is_visible,
705 };
706 
707 /* convert iscsi_ipaddress_state values to ascii string name */
708 static const struct {
709 	enum iscsi_ipaddress_state	value;
710 	char				*name;
711 } iscsi_ipaddress_state_names[] = {
712 	{ISCSI_IPDDRESS_STATE_UNCONFIGURED,	"Unconfigured" },
713 	{ISCSI_IPDDRESS_STATE_ACQUIRING,	"Acquiring" },
714 	{ISCSI_IPDDRESS_STATE_TENTATIVE,	"Tentative" },
715 	{ISCSI_IPDDRESS_STATE_VALID,		"Valid" },
716 	{ISCSI_IPDDRESS_STATE_DISABLING,	"Disabling" },
717 	{ISCSI_IPDDRESS_STATE_INVALID,		"Invalid" },
718 	{ISCSI_IPDDRESS_STATE_DEPRECATED,	"Deprecated" },
719 };
720 
721 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
722 {
723 	int i;
724 	char *state = NULL;
725 
726 	for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
727 		if (iscsi_ipaddress_state_names[i].value == port_state) {
728 			state = iscsi_ipaddress_state_names[i].name;
729 			break;
730 		}
731 	}
732 	return state;
733 }
734 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
735 
736 /* convert iscsi_router_state values to ascii string name */
737 static const struct {
738 	enum iscsi_router_state	value;
739 	char			*name;
740 } iscsi_router_state_names[] = {
741 	{ISCSI_ROUTER_STATE_UNKNOWN,		"Unknown" },
742 	{ISCSI_ROUTER_STATE_ADVERTISED,		"Advertised" },
743 	{ISCSI_ROUTER_STATE_MANUAL,		"Manual" },
744 	{ISCSI_ROUTER_STATE_STALE,		"Stale" },
745 };
746 
747 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
748 {
749 	int i;
750 	char *state = NULL;
751 
752 	for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
753 		if (iscsi_router_state_names[i].value == router_state) {
754 			state = iscsi_router_state_names[i].name;
755 			break;
756 		}
757 	}
758 	return state;
759 }
760 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
761 
762 struct iscsi_iface *
763 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
764 		   uint32_t iface_type, uint32_t iface_num, int dd_size)
765 {
766 	struct iscsi_iface *iface;
767 	int err;
768 
769 	iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
770 	if (!iface)
771 		return NULL;
772 
773 	iface->transport = transport;
774 	iface->iface_type = iface_type;
775 	iface->iface_num = iface_num;
776 	iface->dev.release = iscsi_iface_release;
777 	iface->dev.class = &iscsi_iface_class;
778 	/* parent reference released in iscsi_iface_release */
779 	iface->dev.parent = get_device(&shost->shost_gendev);
780 	if (iface_type == ISCSI_IFACE_TYPE_IPV4)
781 		dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
782 			     iface_num);
783 	else
784 		dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
785 			     iface_num);
786 
787 	err = device_register(&iface->dev);
788 	if (err)
789 		goto free_iface;
790 
791 	err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
792 	if (err)
793 		goto unreg_iface;
794 
795 	if (dd_size)
796 		iface->dd_data = &iface[1];
797 	return iface;
798 
799 unreg_iface:
800 	device_unregister(&iface->dev);
801 	return NULL;
802 
803 free_iface:
804 	put_device(iface->dev.parent);
805 	kfree(iface);
806 	return NULL;
807 }
808 EXPORT_SYMBOL_GPL(iscsi_create_iface);
809 
810 void iscsi_destroy_iface(struct iscsi_iface *iface)
811 {
812 	sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
813 	device_unregister(&iface->dev);
814 }
815 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
816 
817 /*
818  * Interface to display flash node params to sysfs
819  */
820 
821 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)	\
822 struct device_attribute dev_attr_##_prefix##_##_name =			\
823 	__ATTR(_name, _mode, _show, _store)
824 
825 /* flash node session attrs show */
826 #define iscsi_flashnode_sess_attr_show(type, name, param)		\
827 static ssize_t								\
828 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
829 		     char *buf)						\
830 {									\
831 	struct iscsi_bus_flash_session *fnode_sess =			\
832 					iscsi_dev_to_flash_session(dev);\
833 	struct iscsi_transport *t = fnode_sess->transport;		\
834 	return t->get_flashnode_param(fnode_sess, param, buf);		\
835 }									\
836 
837 
838 #define iscsi_flashnode_sess_attr(type, name, param)			\
839 	iscsi_flashnode_sess_attr_show(type, name, param)		\
840 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,			\
841 			    show_##type##_##name, NULL);
842 
843 /* Flash node session attributes */
844 
845 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
846 			  ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
847 iscsi_flashnode_sess_attr(fnode, discovery_session,
848 			  ISCSI_FLASHNODE_DISCOVERY_SESS);
849 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
850 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
851 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
852 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
853 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
854 			  ISCSI_FLASHNODE_DATASEQ_INORDER);
855 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
856 			  ISCSI_FLASHNODE_PDU_INORDER);
857 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
858 iscsi_flashnode_sess_attr(fnode, discovery_logout,
859 			  ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
860 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
861 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
862 			  ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
863 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
864 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
865 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
866 iscsi_flashnode_sess_attr(fnode, def_time2retain,
867 			  ISCSI_FLASHNODE_DEF_TIME2RETAIN);
868 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
869 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
870 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
871 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
872 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
873 			  ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
874 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
875 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
876 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
877 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
878 			  ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
879 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
880 			  ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
881 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
882 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
883 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
884 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
885 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
886 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
887 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
888 
889 static struct attribute *iscsi_flashnode_sess_attrs[] = {
890 	&dev_attr_fnode_auto_snd_tgt_disable.attr,
891 	&dev_attr_fnode_discovery_session.attr,
892 	&dev_attr_fnode_portal_type.attr,
893 	&dev_attr_fnode_entry_enable.attr,
894 	&dev_attr_fnode_immediate_data.attr,
895 	&dev_attr_fnode_initial_r2t.attr,
896 	&dev_attr_fnode_data_seq_in_order.attr,
897 	&dev_attr_fnode_data_pdu_in_order.attr,
898 	&dev_attr_fnode_chap_auth.attr,
899 	&dev_attr_fnode_discovery_logout.attr,
900 	&dev_attr_fnode_bidi_chap.attr,
901 	&dev_attr_fnode_discovery_auth_optional.attr,
902 	&dev_attr_fnode_erl.attr,
903 	&dev_attr_fnode_first_burst_len.attr,
904 	&dev_attr_fnode_def_time2wait.attr,
905 	&dev_attr_fnode_def_time2retain.attr,
906 	&dev_attr_fnode_max_outstanding_r2t.attr,
907 	&dev_attr_fnode_isid.attr,
908 	&dev_attr_fnode_tsid.attr,
909 	&dev_attr_fnode_max_burst_len.attr,
910 	&dev_attr_fnode_def_taskmgmt_tmo.attr,
911 	&dev_attr_fnode_targetalias.attr,
912 	&dev_attr_fnode_targetname.attr,
913 	&dev_attr_fnode_tpgt.attr,
914 	&dev_attr_fnode_discovery_parent_idx.attr,
915 	&dev_attr_fnode_discovery_parent_type.attr,
916 	&dev_attr_fnode_chap_in_idx.attr,
917 	&dev_attr_fnode_chap_out_idx.attr,
918 	&dev_attr_fnode_username.attr,
919 	&dev_attr_fnode_username_in.attr,
920 	&dev_attr_fnode_password.attr,
921 	&dev_attr_fnode_password_in.attr,
922 	&dev_attr_fnode_is_boot_target.attr,
923 	NULL,
924 };
925 
926 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
927 						    struct attribute *attr,
928 						    int i)
929 {
930 	struct device *dev = container_of(kobj, struct device, kobj);
931 	struct iscsi_bus_flash_session *fnode_sess =
932 						iscsi_dev_to_flash_session(dev);
933 	struct iscsi_transport *t = fnode_sess->transport;
934 	int param;
935 
936 	if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
937 		param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
938 	} else if (attr == &dev_attr_fnode_discovery_session.attr) {
939 		param = ISCSI_FLASHNODE_DISCOVERY_SESS;
940 	} else if (attr == &dev_attr_fnode_portal_type.attr) {
941 		param = ISCSI_FLASHNODE_PORTAL_TYPE;
942 	} else if (attr == &dev_attr_fnode_entry_enable.attr) {
943 		param = ISCSI_FLASHNODE_ENTRY_EN;
944 	} else if (attr == &dev_attr_fnode_immediate_data.attr) {
945 		param = ISCSI_FLASHNODE_IMM_DATA_EN;
946 	} else if (attr == &dev_attr_fnode_initial_r2t.attr) {
947 		param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
948 	} else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
949 		param = ISCSI_FLASHNODE_DATASEQ_INORDER;
950 	} else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
951 		param = ISCSI_FLASHNODE_PDU_INORDER;
952 	} else if (attr == &dev_attr_fnode_chap_auth.attr) {
953 		param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
954 	} else if (attr == &dev_attr_fnode_discovery_logout.attr) {
955 		param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
956 	} else if (attr == &dev_attr_fnode_bidi_chap.attr) {
957 		param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
958 	} else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
959 		param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
960 	} else if (attr == &dev_attr_fnode_erl.attr) {
961 		param = ISCSI_FLASHNODE_ERL;
962 	} else if (attr == &dev_attr_fnode_first_burst_len.attr) {
963 		param = ISCSI_FLASHNODE_FIRST_BURST;
964 	} else if (attr == &dev_attr_fnode_def_time2wait.attr) {
965 		param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
966 	} else if (attr == &dev_attr_fnode_def_time2retain.attr) {
967 		param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
968 	} else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
969 		param = ISCSI_FLASHNODE_MAX_R2T;
970 	} else if (attr == &dev_attr_fnode_isid.attr) {
971 		param = ISCSI_FLASHNODE_ISID;
972 	} else if (attr == &dev_attr_fnode_tsid.attr) {
973 		param = ISCSI_FLASHNODE_TSID;
974 	} else if (attr == &dev_attr_fnode_max_burst_len.attr) {
975 		param = ISCSI_FLASHNODE_MAX_BURST;
976 	} else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
977 		param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
978 	} else if (attr == &dev_attr_fnode_targetalias.attr) {
979 		param = ISCSI_FLASHNODE_ALIAS;
980 	} else if (attr == &dev_attr_fnode_targetname.attr) {
981 		param = ISCSI_FLASHNODE_NAME;
982 	} else if (attr == &dev_attr_fnode_tpgt.attr) {
983 		param = ISCSI_FLASHNODE_TPGT;
984 	} else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
985 		param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
986 	} else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
987 		param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
988 	} else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
989 		param = ISCSI_FLASHNODE_CHAP_IN_IDX;
990 	} else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
991 		param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
992 	} else if (attr == &dev_attr_fnode_username.attr) {
993 		param = ISCSI_FLASHNODE_USERNAME;
994 	} else if (attr == &dev_attr_fnode_username_in.attr) {
995 		param = ISCSI_FLASHNODE_USERNAME_IN;
996 	} else if (attr == &dev_attr_fnode_password.attr) {
997 		param = ISCSI_FLASHNODE_PASSWORD;
998 	} else if (attr == &dev_attr_fnode_password_in.attr) {
999 		param = ISCSI_FLASHNODE_PASSWORD_IN;
1000 	} else if (attr == &dev_attr_fnode_is_boot_target.attr) {
1001 		param = ISCSI_FLASHNODE_IS_BOOT_TGT;
1002 	} else {
1003 		WARN_ONCE(1, "Invalid flashnode session attr");
1004 		return 0;
1005 	}
1006 
1007 	return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1008 }
1009 
1010 static struct attribute_group iscsi_flashnode_sess_attr_group = {
1011 	.attrs = iscsi_flashnode_sess_attrs,
1012 	.is_visible = iscsi_flashnode_sess_attr_is_visible,
1013 };
1014 
1015 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
1016 	&iscsi_flashnode_sess_attr_group,
1017 	NULL,
1018 };
1019 
1020 static void iscsi_flashnode_sess_release(struct device *dev)
1021 {
1022 	struct iscsi_bus_flash_session *fnode_sess =
1023 						iscsi_dev_to_flash_session(dev);
1024 
1025 	kfree(fnode_sess->targetname);
1026 	kfree(fnode_sess->targetalias);
1027 	kfree(fnode_sess->portal_type);
1028 	kfree(fnode_sess);
1029 }
1030 
1031 static const struct device_type iscsi_flashnode_sess_dev_type = {
1032 	.name = "iscsi_flashnode_sess_dev_type",
1033 	.groups = iscsi_flashnode_sess_attr_groups,
1034 	.release = iscsi_flashnode_sess_release,
1035 };
1036 
1037 /* flash node connection attrs show */
1038 #define iscsi_flashnode_conn_attr_show(type, name, param)		\
1039 static ssize_t								\
1040 show_##type##_##name(struct device *dev, struct device_attribute *attr,	\
1041 		     char *buf)						\
1042 {									\
1043 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1044 	struct iscsi_bus_flash_session *fnode_sess =			\
1045 				iscsi_flash_conn_to_flash_session(fnode_conn);\
1046 	struct iscsi_transport *t = fnode_conn->transport;		\
1047 	return t->get_flashnode_param(fnode_sess, param, buf);		\
1048 }									\
1049 
1050 
1051 #define iscsi_flashnode_conn_attr(type, name, param)			\
1052 	iscsi_flashnode_conn_attr_show(type, name, param)		\
1053 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,			\
1054 			    show_##type##_##name, NULL);
1055 
1056 /* Flash node connection attributes */
1057 
1058 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1059 			  ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1060 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1061 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1062 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1063 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1064 			  ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1065 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1066 			  ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1067 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1068 			  ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1069 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1070 			  ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1071 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1072 			  ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1073 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1074 			  ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1075 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1076 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1077 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1078 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1079 			  ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1080 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1081 			  ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1082 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1083 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1084 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1085 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1086 			  ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1087 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1088 			  ISCSI_FLASHNODE_REDIRECT_IPADDR);
1089 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1090 			  ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1091 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1092 			  ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1093 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1094 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1095 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1096 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1097 
1098 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1099 	&dev_attr_fnode_is_fw_assigned_ipv6.attr,
1100 	&dev_attr_fnode_header_digest.attr,
1101 	&dev_attr_fnode_data_digest.attr,
1102 	&dev_attr_fnode_snack_req.attr,
1103 	&dev_attr_fnode_tcp_timestamp_stat.attr,
1104 	&dev_attr_fnode_tcp_nagle_disable.attr,
1105 	&dev_attr_fnode_tcp_wsf_disable.attr,
1106 	&dev_attr_fnode_tcp_timer_scale.attr,
1107 	&dev_attr_fnode_tcp_timestamp_enable.attr,
1108 	&dev_attr_fnode_fragment_disable.attr,
1109 	&dev_attr_fnode_max_recv_dlength.attr,
1110 	&dev_attr_fnode_max_xmit_dlength.attr,
1111 	&dev_attr_fnode_keepalive_tmo.attr,
1112 	&dev_attr_fnode_port.attr,
1113 	&dev_attr_fnode_ipaddress.attr,
1114 	&dev_attr_fnode_redirect_ipaddr.attr,
1115 	&dev_attr_fnode_max_segment_size.attr,
1116 	&dev_attr_fnode_local_port.attr,
1117 	&dev_attr_fnode_ipv4_tos.attr,
1118 	&dev_attr_fnode_ipv6_traffic_class.attr,
1119 	&dev_attr_fnode_ipv6_flow_label.attr,
1120 	&dev_attr_fnode_link_local_ipv6.attr,
1121 	&dev_attr_fnode_tcp_xmit_wsf.attr,
1122 	&dev_attr_fnode_tcp_recv_wsf.attr,
1123 	&dev_attr_fnode_statsn.attr,
1124 	&dev_attr_fnode_exp_statsn.attr,
1125 	NULL,
1126 };
1127 
1128 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1129 						    struct attribute *attr,
1130 						    int i)
1131 {
1132 	struct device *dev = container_of(kobj, struct device, kobj);
1133 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1134 	struct iscsi_transport *t = fnode_conn->transport;
1135 	int param;
1136 
1137 	if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1138 		param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1139 	} else if (attr == &dev_attr_fnode_header_digest.attr) {
1140 		param = ISCSI_FLASHNODE_HDR_DGST_EN;
1141 	} else if (attr == &dev_attr_fnode_data_digest.attr) {
1142 		param = ISCSI_FLASHNODE_DATA_DGST_EN;
1143 	} else if (attr == &dev_attr_fnode_snack_req.attr) {
1144 		param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1145 	} else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1146 		param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1147 	} else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1148 		param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1149 	} else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1150 		param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1151 	} else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1152 		param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1153 	} else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1154 		param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1155 	} else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1156 		param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1157 	} else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1158 		param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1159 	} else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1160 		param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1161 	} else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1162 		param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1163 	} else if (attr == &dev_attr_fnode_port.attr) {
1164 		param = ISCSI_FLASHNODE_PORT;
1165 	} else if (attr == &dev_attr_fnode_ipaddress.attr) {
1166 		param = ISCSI_FLASHNODE_IPADDR;
1167 	} else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1168 		param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1169 	} else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1170 		param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1171 	} else if (attr == &dev_attr_fnode_local_port.attr) {
1172 		param = ISCSI_FLASHNODE_LOCAL_PORT;
1173 	} else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1174 		param = ISCSI_FLASHNODE_IPV4_TOS;
1175 	} else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1176 		param = ISCSI_FLASHNODE_IPV6_TC;
1177 	} else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1178 		param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1179 	} else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1180 		param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1181 	} else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1182 		param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1183 	} else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1184 		param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1185 	} else if (attr == &dev_attr_fnode_statsn.attr) {
1186 		param = ISCSI_FLASHNODE_STATSN;
1187 	} else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1188 		param = ISCSI_FLASHNODE_EXP_STATSN;
1189 	} else {
1190 		WARN_ONCE(1, "Invalid flashnode connection attr");
1191 		return 0;
1192 	}
1193 
1194 	return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1195 }
1196 
1197 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1198 	.attrs = iscsi_flashnode_conn_attrs,
1199 	.is_visible = iscsi_flashnode_conn_attr_is_visible,
1200 };
1201 
1202 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1203 	&iscsi_flashnode_conn_attr_group,
1204 	NULL,
1205 };
1206 
1207 static void iscsi_flashnode_conn_release(struct device *dev)
1208 {
1209 	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1210 
1211 	kfree(fnode_conn->ipaddress);
1212 	kfree(fnode_conn->redirect_ipaddr);
1213 	kfree(fnode_conn->link_local_ipv6_addr);
1214 	kfree(fnode_conn);
1215 }
1216 
1217 static const struct device_type iscsi_flashnode_conn_dev_type = {
1218 	.name = "iscsi_flashnode_conn_dev_type",
1219 	.groups = iscsi_flashnode_conn_attr_groups,
1220 	.release = iscsi_flashnode_conn_release,
1221 };
1222 
1223 static struct bus_type iscsi_flashnode_bus;
1224 
1225 int iscsi_flashnode_bus_match(struct device *dev,
1226 				     struct device_driver *drv)
1227 {
1228 	if (dev->bus == &iscsi_flashnode_bus)
1229 		return 1;
1230 	return 0;
1231 }
1232 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1233 
1234 static struct bus_type iscsi_flashnode_bus = {
1235 	.name = "iscsi_flashnode",
1236 	.match = &iscsi_flashnode_bus_match,
1237 };
1238 
1239 /**
1240  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1241  * @shost: pointer to host data
1242  * @index: index of flashnode to add in sysfs
1243  * @transport: pointer to transport data
1244  * @dd_size: total size to allocate
1245  *
1246  * Adds a sysfs entry for the flashnode session attributes
1247  *
1248  * Returns:
1249  *  pointer to allocated flashnode sess on success
1250  *  %NULL on failure
1251  */
1252 struct iscsi_bus_flash_session *
1253 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1254 			    struct iscsi_transport *transport,
1255 			    int dd_size)
1256 {
1257 	struct iscsi_bus_flash_session *fnode_sess;
1258 	int err;
1259 
1260 	fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1261 	if (!fnode_sess)
1262 		return NULL;
1263 
1264 	fnode_sess->transport = transport;
1265 	fnode_sess->target_id = index;
1266 	fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1267 	fnode_sess->dev.bus = &iscsi_flashnode_bus;
1268 	fnode_sess->dev.parent = &shost->shost_gendev;
1269 	dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1270 		     shost->host_no, index);
1271 
1272 	err = device_register(&fnode_sess->dev);
1273 	if (err)
1274 		goto free_fnode_sess;
1275 
1276 	if (dd_size)
1277 		fnode_sess->dd_data = &fnode_sess[1];
1278 
1279 	return fnode_sess;
1280 
1281 free_fnode_sess:
1282 	kfree(fnode_sess);
1283 	return NULL;
1284 }
1285 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1286 
1287 /**
1288  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1289  * @shost: pointer to host data
1290  * @fnode_sess: pointer to the parent flashnode session entry
1291  * @transport: pointer to transport data
1292  * @dd_size: total size to allocate
1293  *
1294  * Adds a sysfs entry for the flashnode connection attributes
1295  *
1296  * Returns:
1297  *  pointer to allocated flashnode conn on success
1298  *  %NULL on failure
1299  */
1300 struct iscsi_bus_flash_conn *
1301 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1302 			    struct iscsi_bus_flash_session *fnode_sess,
1303 			    struct iscsi_transport *transport,
1304 			    int dd_size)
1305 {
1306 	struct iscsi_bus_flash_conn *fnode_conn;
1307 	int err;
1308 
1309 	fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1310 	if (!fnode_conn)
1311 		return NULL;
1312 
1313 	fnode_conn->transport = transport;
1314 	fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1315 	fnode_conn->dev.bus = &iscsi_flashnode_bus;
1316 	fnode_conn->dev.parent = &fnode_sess->dev;
1317 	dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1318 		     shost->host_no, fnode_sess->target_id);
1319 
1320 	err = device_register(&fnode_conn->dev);
1321 	if (err)
1322 		goto free_fnode_conn;
1323 
1324 	if (dd_size)
1325 		fnode_conn->dd_data = &fnode_conn[1];
1326 
1327 	return fnode_conn;
1328 
1329 free_fnode_conn:
1330 	kfree(fnode_conn);
1331 	return NULL;
1332 }
1333 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1334 
1335 /**
1336  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1337  * @dev: device to verify
1338  * @data: pointer to data containing value to use for verification
1339  *
1340  * Verifies if the passed device is flashnode conn device
1341  *
1342  * Returns:
1343  *  1 on success
1344  *  0 on failure
1345  */
1346 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1347 {
1348 	return dev->bus == &iscsi_flashnode_bus;
1349 }
1350 
1351 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1352 {
1353 	device_unregister(&fnode_conn->dev);
1354 	return 0;
1355 }
1356 
1357 static int flashnode_match_index(struct device *dev, void *data)
1358 {
1359 	struct iscsi_bus_flash_session *fnode_sess = NULL;
1360 	int ret = 0;
1361 
1362 	if (!iscsi_flashnode_bus_match(dev, NULL))
1363 		goto exit_match_index;
1364 
1365 	fnode_sess = iscsi_dev_to_flash_session(dev);
1366 	ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1367 
1368 exit_match_index:
1369 	return ret;
1370 }
1371 
1372 /**
1373  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1374  * @shost: pointer to host data
1375  * @idx: index to match
1376  *
1377  * Finds the flashnode session object for the passed index
1378  *
1379  * Returns:
1380  *  pointer to found flashnode session object on success
1381  *  %NULL on failure
1382  */
1383 static struct iscsi_bus_flash_session *
1384 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1385 {
1386 	struct iscsi_bus_flash_session *fnode_sess = NULL;
1387 	struct device *dev;
1388 
1389 	dev = device_find_child(&shost->shost_gendev, &idx,
1390 				flashnode_match_index);
1391 	if (dev)
1392 		fnode_sess = iscsi_dev_to_flash_session(dev);
1393 
1394 	return fnode_sess;
1395 }
1396 
1397 /**
1398  * iscsi_find_flashnode_sess - finds flashnode session entry
1399  * @shost: pointer to host data
1400  * @data: pointer to data containing value to use for comparison
1401  * @fn: function pointer that does actual comparison
1402  *
1403  * Finds the flashnode session object comparing the data passed using logic
1404  * defined in passed function pointer
1405  *
1406  * Returns:
1407  *  pointer to found flashnode session device object on success
1408  *  %NULL on failure
1409  */
1410 struct device *
1411 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1412 			  int (*fn)(struct device *dev, void *data))
1413 {
1414 	return device_find_child(&shost->shost_gendev, data, fn);
1415 }
1416 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1417 
1418 /**
1419  * iscsi_find_flashnode_conn - finds flashnode connection entry
1420  * @fnode_sess: pointer to parent flashnode session entry
1421  *
1422  * Finds the flashnode connection object comparing the data passed using logic
1423  * defined in passed function pointer
1424  *
1425  * Returns:
1426  *  pointer to found flashnode connection device object on success
1427  *  %NULL on failure
1428  */
1429 struct device *
1430 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1431 {
1432 	return device_find_child(&fnode_sess->dev, NULL,
1433 				 iscsi_is_flashnode_conn_dev);
1434 }
1435 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1436 
1437 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1438 {
1439 	if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1440 		return 0;
1441 
1442 	return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1443 }
1444 
1445 /**
1446  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1447  * @fnode_sess: pointer to flashnode session entry to be destroyed
1448  *
1449  * Deletes the flashnode session entry and all children flashnode connection
1450  * entries from sysfs
1451  */
1452 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1453 {
1454 	int err;
1455 
1456 	err = device_for_each_child(&fnode_sess->dev, NULL,
1457 				    iscsi_iter_destroy_flashnode_conn_fn);
1458 	if (err)
1459 		pr_err("Could not delete all connections for %s. Error %d.\n",
1460 		       fnode_sess->dev.kobj.name, err);
1461 
1462 	device_unregister(&fnode_sess->dev);
1463 }
1464 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1465 
1466 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1467 {
1468 	if (!iscsi_flashnode_bus_match(dev, NULL))
1469 		return 0;
1470 
1471 	iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1472 	return 0;
1473 }
1474 
1475 /**
1476  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1477  * @shost: pointer to host data
1478  *
1479  * Destroys all the flashnode session entries and all corresponding children
1480  * flashnode connection entries from sysfs
1481  */
1482 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1483 {
1484 	device_for_each_child(&shost->shost_gendev, NULL,
1485 			      iscsi_iter_destroy_flashnode_fn);
1486 }
1487 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1488 
1489 /*
1490  * BSG support
1491  */
1492 /**
1493  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1494  * @job: bsg job to be processed
1495  */
1496 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1497 {
1498 	struct Scsi_Host *shost = iscsi_job_to_shost(job);
1499 	struct iscsi_bsg_request *req = job->request;
1500 	struct iscsi_bsg_reply *reply = job->reply;
1501 	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1502 	int cmdlen = sizeof(uint32_t);	/* start with length of msgcode */
1503 	int ret;
1504 
1505 	/* check if we have the msgcode value at least */
1506 	if (job->request_len < sizeof(uint32_t)) {
1507 		ret = -ENOMSG;
1508 		goto fail_host_msg;
1509 	}
1510 
1511 	/* Validate the host command */
1512 	switch (req->msgcode) {
1513 	case ISCSI_BSG_HST_VENDOR:
1514 		cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1515 		if ((shost->hostt->vendor_id == 0L) ||
1516 		    (req->rqst_data.h_vendor.vendor_id !=
1517 			shost->hostt->vendor_id)) {
1518 			ret = -ESRCH;
1519 			goto fail_host_msg;
1520 		}
1521 		break;
1522 	default:
1523 		ret = -EBADR;
1524 		goto fail_host_msg;
1525 	}
1526 
1527 	/* check if we really have all the request data needed */
1528 	if (job->request_len < cmdlen) {
1529 		ret = -ENOMSG;
1530 		goto fail_host_msg;
1531 	}
1532 
1533 	ret = i->iscsi_transport->bsg_request(job);
1534 	if (!ret)
1535 		return 0;
1536 
1537 fail_host_msg:
1538 	/* return the errno failure code as the only status */
1539 	BUG_ON(job->reply_len < sizeof(uint32_t));
1540 	reply->reply_payload_rcv_len = 0;
1541 	reply->result = ret;
1542 	job->reply_len = sizeof(uint32_t);
1543 	bsg_job_done(job, ret, 0);
1544 	return 0;
1545 }
1546 
1547 /**
1548  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1549  * @shost: shost for iscsi_host
1550  * @ihost: iscsi_cls_host adding the structures to
1551  */
1552 static int
1553 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1554 {
1555 	struct device *dev = &shost->shost_gendev;
1556 	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1557 	struct request_queue *q;
1558 	char bsg_name[20];
1559 
1560 	if (!i->iscsi_transport->bsg_request)
1561 		return -ENOTSUPP;
1562 
1563 	snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1564 	q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1565 	if (IS_ERR(q)) {
1566 		shost_printk(KERN_ERR, shost, "bsg interface failed to "
1567 			     "initialize - no request queue\n");
1568 		return PTR_ERR(q);
1569 	}
1570 	__scsi_init_queue(shost, q);
1571 
1572 	ihost->bsg_q = q;
1573 	return 0;
1574 }
1575 
1576 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1577 			    struct device *cdev)
1578 {
1579 	struct Scsi_Host *shost = dev_to_shost(dev);
1580 	struct iscsi_cls_host *ihost = shost->shost_data;
1581 
1582 	memset(ihost, 0, sizeof(*ihost));
1583 	atomic_set(&ihost->nr_scans, 0);
1584 	mutex_init(&ihost->mutex);
1585 
1586 	iscsi_bsg_host_add(shost, ihost);
1587 	/* ignore any bsg add error - we just can't do sgio */
1588 
1589 	return 0;
1590 }
1591 
1592 static int iscsi_remove_host(struct transport_container *tc,
1593 			     struct device *dev, struct device *cdev)
1594 {
1595 	struct Scsi_Host *shost = dev_to_shost(dev);
1596 	struct iscsi_cls_host *ihost = shost->shost_data;
1597 
1598 	bsg_remove_queue(ihost->bsg_q);
1599 	return 0;
1600 }
1601 
1602 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1603 			       "iscsi_host",
1604 			       iscsi_setup_host,
1605 			       iscsi_remove_host,
1606 			       NULL);
1607 
1608 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1609 			       "iscsi_session",
1610 			       NULL,
1611 			       NULL,
1612 			       NULL);
1613 
1614 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1615 			       "iscsi_connection",
1616 			       NULL,
1617 			       NULL,
1618 			       NULL);
1619 
1620 static struct sock *nls;
1621 static DEFINE_MUTEX(rx_queue_mutex);
1622 
1623 /*
1624  * conn_mutex protects the {start,bind,stop,destroy}_conn from racing
1625  * against the kernel stop_connection recovery mechanism
1626  */
1627 static DEFINE_MUTEX(conn_mutex);
1628 
1629 static LIST_HEAD(sesslist);
1630 static DEFINE_SPINLOCK(sesslock);
1631 static LIST_HEAD(connlist);
1632 static LIST_HEAD(connlist_err);
1633 static DEFINE_SPINLOCK(connlock);
1634 
1635 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1636 {
1637 	struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1638 	return sess->sid;
1639 }
1640 
1641 /*
1642  * Returns the matching session to a given sid
1643  */
1644 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1645 {
1646 	unsigned long flags;
1647 	struct iscsi_cls_session *sess;
1648 
1649 	spin_lock_irqsave(&sesslock, flags);
1650 	list_for_each_entry(sess, &sesslist, sess_list) {
1651 		if (sess->sid == sid) {
1652 			spin_unlock_irqrestore(&sesslock, flags);
1653 			return sess;
1654 		}
1655 	}
1656 	spin_unlock_irqrestore(&sesslock, flags);
1657 	return NULL;
1658 }
1659 
1660 /*
1661  * Returns the matching connection to a given sid / cid tuple
1662  */
1663 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1664 {
1665 	unsigned long flags;
1666 	struct iscsi_cls_conn *conn;
1667 
1668 	spin_lock_irqsave(&connlock, flags);
1669 	list_for_each_entry(conn, &connlist, conn_list) {
1670 		if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1671 			spin_unlock_irqrestore(&connlock, flags);
1672 			return conn;
1673 		}
1674 	}
1675 	spin_unlock_irqrestore(&connlock, flags);
1676 	return NULL;
1677 }
1678 
1679 /*
1680  * The following functions can be used by LLDs that allocate
1681  * their own scsi_hosts or by software iscsi LLDs
1682  */
1683 static struct {
1684 	int value;
1685 	char *name;
1686 } iscsi_session_state_names[] = {
1687 	{ ISCSI_SESSION_LOGGED_IN,	"LOGGED_IN" },
1688 	{ ISCSI_SESSION_FAILED,		"FAILED" },
1689 	{ ISCSI_SESSION_FREE,		"FREE" },
1690 };
1691 
1692 static const char *iscsi_session_state_name(int state)
1693 {
1694 	int i;
1695 	char *name = NULL;
1696 
1697 	for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1698 		if (iscsi_session_state_names[i].value == state) {
1699 			name = iscsi_session_state_names[i].name;
1700 			break;
1701 		}
1702 	}
1703 	return name;
1704 }
1705 
1706 int iscsi_session_chkready(struct iscsi_cls_session *session)
1707 {
1708 	int err;
1709 
1710 	switch (session->state) {
1711 	case ISCSI_SESSION_LOGGED_IN:
1712 		err = 0;
1713 		break;
1714 	case ISCSI_SESSION_FAILED:
1715 		err = DID_IMM_RETRY << 16;
1716 		break;
1717 	case ISCSI_SESSION_FREE:
1718 		err = DID_TRANSPORT_FAILFAST << 16;
1719 		break;
1720 	default:
1721 		err = DID_NO_CONNECT << 16;
1722 		break;
1723 	}
1724 	return err;
1725 }
1726 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1727 
1728 int iscsi_is_session_online(struct iscsi_cls_session *session)
1729 {
1730 	unsigned long flags;
1731 	int ret = 0;
1732 
1733 	spin_lock_irqsave(&session->lock, flags);
1734 	if (session->state == ISCSI_SESSION_LOGGED_IN)
1735 		ret = 1;
1736 	spin_unlock_irqrestore(&session->lock, flags);
1737 	return ret;
1738 }
1739 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1740 
1741 static void iscsi_session_release(struct device *dev)
1742 {
1743 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1744 	struct Scsi_Host *shost;
1745 
1746 	shost = iscsi_session_to_shost(session);
1747 	scsi_host_put(shost);
1748 	ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1749 	kfree(session);
1750 }
1751 
1752 int iscsi_is_session_dev(const struct device *dev)
1753 {
1754 	return dev->release == iscsi_session_release;
1755 }
1756 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1757 
1758 static int iscsi_iter_session_fn(struct device *dev, void *data)
1759 {
1760 	void (* fn) (struct iscsi_cls_session *) = data;
1761 
1762 	if (!iscsi_is_session_dev(dev))
1763 		return 0;
1764 	fn(iscsi_dev_to_session(dev));
1765 	return 0;
1766 }
1767 
1768 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1769 				 void (*fn)(struct iscsi_cls_session *))
1770 {
1771 	device_for_each_child(&shost->shost_gendev, fn,
1772 			      iscsi_iter_session_fn);
1773 }
1774 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1775 
1776 /**
1777  * iscsi_scan_finished - helper to report when running scans are done
1778  * @shost: scsi host
1779  * @time: scan run time
1780  *
1781  * This function can be used by drives like qla4xxx to report to the scsi
1782  * layer when the scans it kicked off at module load time are done.
1783  */
1784 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1785 {
1786 	struct iscsi_cls_host *ihost = shost->shost_data;
1787 	/*
1788 	 * qla4xxx will have kicked off some session unblocks before calling
1789 	 * scsi_scan_host, so just wait for them to complete.
1790 	 */
1791 	return !atomic_read(&ihost->nr_scans);
1792 }
1793 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1794 
1795 struct iscsi_scan_data {
1796 	unsigned int channel;
1797 	unsigned int id;
1798 	u64 lun;
1799 	enum scsi_scan_mode rescan;
1800 };
1801 
1802 static int iscsi_user_scan_session(struct device *dev, void *data)
1803 {
1804 	struct iscsi_scan_data *scan_data = data;
1805 	struct iscsi_cls_session *session;
1806 	struct Scsi_Host *shost;
1807 	struct iscsi_cls_host *ihost;
1808 	unsigned long flags;
1809 	unsigned int id;
1810 
1811 	if (!iscsi_is_session_dev(dev))
1812 		return 0;
1813 
1814 	session = iscsi_dev_to_session(dev);
1815 
1816 	ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1817 
1818 	shost = iscsi_session_to_shost(session);
1819 	ihost = shost->shost_data;
1820 
1821 	mutex_lock(&ihost->mutex);
1822 	spin_lock_irqsave(&session->lock, flags);
1823 	if (session->state != ISCSI_SESSION_LOGGED_IN) {
1824 		spin_unlock_irqrestore(&session->lock, flags);
1825 		goto user_scan_exit;
1826 	}
1827 	id = session->target_id;
1828 	spin_unlock_irqrestore(&session->lock, flags);
1829 
1830 	if (id != ISCSI_MAX_TARGET) {
1831 		if ((scan_data->channel == SCAN_WILD_CARD ||
1832 		     scan_data->channel == 0) &&
1833 		    (scan_data->id == SCAN_WILD_CARD ||
1834 		     scan_data->id == id))
1835 			scsi_scan_target(&session->dev, 0, id,
1836 					 scan_data->lun, scan_data->rescan);
1837 	}
1838 
1839 user_scan_exit:
1840 	mutex_unlock(&ihost->mutex);
1841 	ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1842 	return 0;
1843 }
1844 
1845 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1846 			   uint id, u64 lun)
1847 {
1848 	struct iscsi_scan_data scan_data;
1849 
1850 	scan_data.channel = channel;
1851 	scan_data.id = id;
1852 	scan_data.lun = lun;
1853 	scan_data.rescan = SCSI_SCAN_MANUAL;
1854 
1855 	return device_for_each_child(&shost->shost_gendev, &scan_data,
1856 				     iscsi_user_scan_session);
1857 }
1858 
1859 static void iscsi_scan_session(struct work_struct *work)
1860 {
1861 	struct iscsi_cls_session *session =
1862 			container_of(work, struct iscsi_cls_session, scan_work);
1863 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
1864 	struct iscsi_cls_host *ihost = shost->shost_data;
1865 	struct iscsi_scan_data scan_data;
1866 
1867 	scan_data.channel = 0;
1868 	scan_data.id = SCAN_WILD_CARD;
1869 	scan_data.lun = SCAN_WILD_CARD;
1870 	scan_data.rescan = SCSI_SCAN_RESCAN;
1871 
1872 	iscsi_user_scan_session(&session->dev, &scan_data);
1873 	atomic_dec(&ihost->nr_scans);
1874 }
1875 
1876 /**
1877  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1878  * @cmd: scsi cmd passed to scsi eh handler
1879  *
1880  * If the session is down this function will wait for the recovery
1881  * timer to fire or for the session to be logged back in. If the
1882  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1883  * should pass this error value to the scsi eh.
1884  */
1885 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1886 {
1887 	struct iscsi_cls_session *session =
1888 			starget_to_session(scsi_target(cmd->device));
1889 	unsigned long flags;
1890 	int ret = 0;
1891 
1892 	spin_lock_irqsave(&session->lock, flags);
1893 	while (session->state != ISCSI_SESSION_LOGGED_IN) {
1894 		if (session->state == ISCSI_SESSION_FREE) {
1895 			ret = FAST_IO_FAIL;
1896 			break;
1897 		}
1898 		spin_unlock_irqrestore(&session->lock, flags);
1899 		msleep(1000);
1900 		spin_lock_irqsave(&session->lock, flags);
1901 	}
1902 	spin_unlock_irqrestore(&session->lock, flags);
1903 	return ret;
1904 }
1905 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1906 
1907 static void session_recovery_timedout(struct work_struct *work)
1908 {
1909 	struct iscsi_cls_session *session =
1910 		container_of(work, struct iscsi_cls_session,
1911 			     recovery_work.work);
1912 	unsigned long flags;
1913 
1914 	iscsi_cls_session_printk(KERN_INFO, session,
1915 				 "session recovery timed out after %d secs\n",
1916 				 session->recovery_tmo);
1917 
1918 	spin_lock_irqsave(&session->lock, flags);
1919 	switch (session->state) {
1920 	case ISCSI_SESSION_FAILED:
1921 		session->state = ISCSI_SESSION_FREE;
1922 		break;
1923 	case ISCSI_SESSION_LOGGED_IN:
1924 	case ISCSI_SESSION_FREE:
1925 		/* we raced with the unblock's flush */
1926 		spin_unlock_irqrestore(&session->lock, flags);
1927 		return;
1928 	}
1929 	spin_unlock_irqrestore(&session->lock, flags);
1930 
1931 	if (session->transport->session_recovery_timedout)
1932 		session->transport->session_recovery_timedout(session);
1933 
1934 	ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1935 	scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1936 	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1937 }
1938 
1939 static void __iscsi_unblock_session(struct work_struct *work)
1940 {
1941 	struct iscsi_cls_session *session =
1942 			container_of(work, struct iscsi_cls_session,
1943 				     unblock_work);
1944 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
1945 	struct iscsi_cls_host *ihost = shost->shost_data;
1946 	unsigned long flags;
1947 
1948 	ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1949 	/*
1950 	 * The recovery and unblock work get run from the same workqueue,
1951 	 * so try to cancel it if it was going to run after this unblock.
1952 	 */
1953 	cancel_delayed_work(&session->recovery_work);
1954 	spin_lock_irqsave(&session->lock, flags);
1955 	session->state = ISCSI_SESSION_LOGGED_IN;
1956 	spin_unlock_irqrestore(&session->lock, flags);
1957 	/* start IO */
1958 	scsi_target_unblock(&session->dev, SDEV_RUNNING);
1959 	/*
1960 	 * Only do kernel scanning if the driver is properly hooked into
1961 	 * the async scanning code (drivers like iscsi_tcp do login and
1962 	 * scanning from userspace).
1963 	 */
1964 	if (shost->hostt->scan_finished) {
1965 		if (scsi_queue_work(shost, &session->scan_work))
1966 			atomic_inc(&ihost->nr_scans);
1967 	}
1968 	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1969 }
1970 
1971 /**
1972  * iscsi_unblock_session - set a session as logged in and start IO.
1973  * @session: iscsi session
1974  *
1975  * Mark a session as ready to accept IO.
1976  */
1977 void iscsi_unblock_session(struct iscsi_cls_session *session)
1978 {
1979 	queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1980 	/*
1981 	 * Blocking the session can be done from any context so we only
1982 	 * queue the block work. Make sure the unblock work has completed
1983 	 * because it flushes/cancels the other works and updates the state.
1984 	 */
1985 	flush_work(&session->unblock_work);
1986 }
1987 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1988 
1989 static void __iscsi_block_session(struct work_struct *work)
1990 {
1991 	struct iscsi_cls_session *session =
1992 			container_of(work, struct iscsi_cls_session,
1993 				     block_work);
1994 	unsigned long flags;
1995 
1996 	ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1997 	spin_lock_irqsave(&session->lock, flags);
1998 	session->state = ISCSI_SESSION_FAILED;
1999 	spin_unlock_irqrestore(&session->lock, flags);
2000 	scsi_target_block(&session->dev);
2001 	ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
2002 	if (session->recovery_tmo >= 0)
2003 		queue_delayed_work(iscsi_eh_timer_workq,
2004 				   &session->recovery_work,
2005 				   session->recovery_tmo * HZ);
2006 }
2007 
2008 void iscsi_block_session(struct iscsi_cls_session *session)
2009 {
2010 	queue_work(iscsi_eh_timer_workq, &session->block_work);
2011 }
2012 EXPORT_SYMBOL_GPL(iscsi_block_session);
2013 
2014 static void __iscsi_unbind_session(struct work_struct *work)
2015 {
2016 	struct iscsi_cls_session *session =
2017 			container_of(work, struct iscsi_cls_session,
2018 				     unbind_work);
2019 	struct Scsi_Host *shost = iscsi_session_to_shost(session);
2020 	struct iscsi_cls_host *ihost = shost->shost_data;
2021 	unsigned long flags;
2022 	unsigned int target_id;
2023 
2024 	ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2025 
2026 	/* Prevent new scans and make sure scanning is not in progress */
2027 	mutex_lock(&ihost->mutex);
2028 	spin_lock_irqsave(&session->lock, flags);
2029 	if (session->target_id == ISCSI_MAX_TARGET) {
2030 		spin_unlock_irqrestore(&session->lock, flags);
2031 		mutex_unlock(&ihost->mutex);
2032 		goto unbind_session_exit;
2033 	}
2034 
2035 	target_id = session->target_id;
2036 	session->target_id = ISCSI_MAX_TARGET;
2037 	spin_unlock_irqrestore(&session->lock, flags);
2038 	mutex_unlock(&ihost->mutex);
2039 
2040 	scsi_remove_target(&session->dev);
2041 
2042 	if (session->ida_used)
2043 		ida_simple_remove(&iscsi_sess_ida, target_id);
2044 
2045 unbind_session_exit:
2046 	iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2047 	ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2048 }
2049 
2050 static void __iscsi_destroy_session(struct work_struct *work)
2051 {
2052 	struct iscsi_cls_session *session =
2053 		container_of(work, struct iscsi_cls_session, destroy_work);
2054 
2055 	session->transport->destroy_session(session);
2056 }
2057 
2058 struct iscsi_cls_session *
2059 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2060 		    int dd_size)
2061 {
2062 	struct iscsi_cls_session *session;
2063 
2064 	session = kzalloc(sizeof(*session) + dd_size,
2065 			  GFP_KERNEL);
2066 	if (!session)
2067 		return NULL;
2068 
2069 	session->transport = transport;
2070 	session->creator = -1;
2071 	session->recovery_tmo = 120;
2072 	session->recovery_tmo_sysfs_override = false;
2073 	session->state = ISCSI_SESSION_FREE;
2074 	INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2075 	INIT_LIST_HEAD(&session->sess_list);
2076 	INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2077 	INIT_WORK(&session->block_work, __iscsi_block_session);
2078 	INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2079 	INIT_WORK(&session->scan_work, iscsi_scan_session);
2080 	INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2081 	spin_lock_init(&session->lock);
2082 
2083 	/* this is released in the dev's release function */
2084 	scsi_host_get(shost);
2085 	session->dev.parent = &shost->shost_gendev;
2086 	session->dev.release = iscsi_session_release;
2087 	device_initialize(&session->dev);
2088 	if (dd_size)
2089 		session->dd_data = &session[1];
2090 
2091 	ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2092 	return session;
2093 }
2094 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2095 
2096 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2097 {
2098 	unsigned long flags;
2099 	int id = 0;
2100 	int err;
2101 
2102 	session->sid = atomic_add_return(1, &iscsi_session_nr);
2103 
2104 	if (target_id == ISCSI_MAX_TARGET) {
2105 		id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2106 
2107 		if (id < 0) {
2108 			iscsi_cls_session_printk(KERN_ERR, session,
2109 					"Failure in Target ID Allocation\n");
2110 			return id;
2111 		}
2112 		session->target_id = (unsigned int)id;
2113 		session->ida_used = true;
2114 	} else
2115 		session->target_id = target_id;
2116 
2117 	dev_set_name(&session->dev, "session%u", session->sid);
2118 	err = device_add(&session->dev);
2119 	if (err) {
2120 		iscsi_cls_session_printk(KERN_ERR, session,
2121 					 "could not register session's dev\n");
2122 		goto release_ida;
2123 	}
2124 	err = transport_register_device(&session->dev);
2125 	if (err) {
2126 		iscsi_cls_session_printk(KERN_ERR, session,
2127 					 "could not register transport's dev\n");
2128 		goto release_dev;
2129 	}
2130 
2131 	spin_lock_irqsave(&sesslock, flags);
2132 	list_add(&session->sess_list, &sesslist);
2133 	spin_unlock_irqrestore(&sesslock, flags);
2134 
2135 	iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2136 	ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2137 	return 0;
2138 
2139 release_dev:
2140 	device_del(&session->dev);
2141 release_ida:
2142 	if (session->ida_used)
2143 		ida_simple_remove(&iscsi_sess_ida, session->target_id);
2144 
2145 	return err;
2146 }
2147 EXPORT_SYMBOL_GPL(iscsi_add_session);
2148 
2149 /**
2150  * iscsi_create_session - create iscsi class session
2151  * @shost: scsi host
2152  * @transport: iscsi transport
2153  * @dd_size: private driver data size
2154  * @target_id: which target
2155  *
2156  * This can be called from a LLD or iscsi_transport.
2157  */
2158 struct iscsi_cls_session *
2159 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2160 		     int dd_size, unsigned int target_id)
2161 {
2162 	struct iscsi_cls_session *session;
2163 
2164 	session = iscsi_alloc_session(shost, transport, dd_size);
2165 	if (!session)
2166 		return NULL;
2167 
2168 	if (iscsi_add_session(session, target_id)) {
2169 		iscsi_free_session(session);
2170 		return NULL;
2171 	}
2172 	return session;
2173 }
2174 EXPORT_SYMBOL_GPL(iscsi_create_session);
2175 
2176 static void iscsi_conn_release(struct device *dev)
2177 {
2178 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2179 	struct device *parent = conn->dev.parent;
2180 
2181 	ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2182 	kfree(conn);
2183 	put_device(parent);
2184 }
2185 
2186 static int iscsi_is_conn_dev(const struct device *dev)
2187 {
2188 	return dev->release == iscsi_conn_release;
2189 }
2190 
2191 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2192 {
2193 	if (!iscsi_is_conn_dev(dev))
2194 		return 0;
2195 	return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2196 }
2197 
2198 void iscsi_remove_session(struct iscsi_cls_session *session)
2199 {
2200 	unsigned long flags;
2201 	int err;
2202 
2203 	ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2204 
2205 	spin_lock_irqsave(&sesslock, flags);
2206 	if (!list_empty(&session->sess_list))
2207 		list_del(&session->sess_list);
2208 	spin_unlock_irqrestore(&sesslock, flags);
2209 
2210 	flush_work(&session->block_work);
2211 	flush_work(&session->unblock_work);
2212 	cancel_delayed_work_sync(&session->recovery_work);
2213 	/*
2214 	 * If we are blocked let commands flow again. The lld or iscsi
2215 	 * layer should set up the queuecommand to fail commands.
2216 	 * We assume that LLD will not be calling block/unblock while
2217 	 * removing the session.
2218 	 */
2219 	spin_lock_irqsave(&session->lock, flags);
2220 	session->state = ISCSI_SESSION_FREE;
2221 	spin_unlock_irqrestore(&session->lock, flags);
2222 
2223 	scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2224 	/* flush running scans then delete devices */
2225 	flush_work(&session->scan_work);
2226 	/* flush running unbind operations */
2227 	flush_work(&session->unbind_work);
2228 	__iscsi_unbind_session(&session->unbind_work);
2229 
2230 	/* hw iscsi may not have removed all connections from session */
2231 	err = device_for_each_child(&session->dev, NULL,
2232 				    iscsi_iter_destroy_conn_fn);
2233 	if (err)
2234 		iscsi_cls_session_printk(KERN_ERR, session,
2235 					 "Could not delete all connections "
2236 					 "for session. Error %d.\n", err);
2237 
2238 	transport_unregister_device(&session->dev);
2239 
2240 	ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2241 	device_del(&session->dev);
2242 }
2243 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2244 
2245 void iscsi_free_session(struct iscsi_cls_session *session)
2246 {
2247 	ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2248 	iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2249 	put_device(&session->dev);
2250 }
2251 EXPORT_SYMBOL_GPL(iscsi_free_session);
2252 
2253 /**
2254  * iscsi_create_conn - create iscsi class connection
2255  * @session: iscsi cls session
2256  * @dd_size: private driver data size
2257  * @cid: connection id
2258  *
2259  * This can be called from a LLD or iscsi_transport. The connection
2260  * is child of the session so cid must be unique for all connections
2261  * on the session.
2262  *
2263  * Since we do not support MCS, cid will normally be zero. In some cases
2264  * for software iscsi we could be trying to preallocate a connection struct
2265  * in which case there could be two connection structs and cid would be
2266  * non-zero.
2267  */
2268 struct iscsi_cls_conn *
2269 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2270 {
2271 	struct iscsi_transport *transport = session->transport;
2272 	struct iscsi_cls_conn *conn;
2273 	unsigned long flags;
2274 	int err;
2275 
2276 	conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2277 	if (!conn)
2278 		return NULL;
2279 	if (dd_size)
2280 		conn->dd_data = &conn[1];
2281 
2282 	mutex_init(&conn->ep_mutex);
2283 	INIT_LIST_HEAD(&conn->conn_list);
2284 	INIT_LIST_HEAD(&conn->conn_list_err);
2285 	conn->transport = transport;
2286 	conn->cid = cid;
2287 	conn->state = ISCSI_CONN_DOWN;
2288 
2289 	/* this is released in the dev's release function */
2290 	if (!get_device(&session->dev))
2291 		goto free_conn;
2292 
2293 	dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2294 	conn->dev.parent = &session->dev;
2295 	conn->dev.release = iscsi_conn_release;
2296 	err = device_register(&conn->dev);
2297 	if (err) {
2298 		iscsi_cls_session_printk(KERN_ERR, session, "could not "
2299 					 "register connection's dev\n");
2300 		goto release_parent_ref;
2301 	}
2302 	err = transport_register_device(&conn->dev);
2303 	if (err) {
2304 		iscsi_cls_session_printk(KERN_ERR, session, "could not "
2305 					 "register transport's dev\n");
2306 		goto release_conn_ref;
2307 	}
2308 
2309 	spin_lock_irqsave(&connlock, flags);
2310 	list_add(&conn->conn_list, &connlist);
2311 	spin_unlock_irqrestore(&connlock, flags);
2312 
2313 	ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2314 	return conn;
2315 
2316 release_conn_ref:
2317 	device_unregister(&conn->dev);
2318 	put_device(&session->dev);
2319 	return NULL;
2320 release_parent_ref:
2321 	put_device(&session->dev);
2322 free_conn:
2323 	kfree(conn);
2324 	return NULL;
2325 }
2326 
2327 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2328 
2329 /**
2330  * iscsi_destroy_conn - destroy iscsi class connection
2331  * @conn: iscsi cls session
2332  *
2333  * This can be called from a LLD or iscsi_transport.
2334  */
2335 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2336 {
2337 	unsigned long flags;
2338 
2339 	spin_lock_irqsave(&connlock, flags);
2340 	list_del(&conn->conn_list);
2341 	list_del(&conn->conn_list_err);
2342 	spin_unlock_irqrestore(&connlock, flags);
2343 
2344 	transport_unregister_device(&conn->dev);
2345 	ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2346 	device_unregister(&conn->dev);
2347 	return 0;
2348 }
2349 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2350 
2351 /*
2352  * iscsi interface functions
2353  */
2354 static struct iscsi_internal *
2355 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2356 {
2357 	struct iscsi_internal *priv;
2358 	unsigned long flags;
2359 
2360 	spin_lock_irqsave(&iscsi_transport_lock, flags);
2361 	list_for_each_entry(priv, &iscsi_transports, list) {
2362 		if (tt == priv->iscsi_transport) {
2363 			spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2364 			return priv;
2365 		}
2366 	}
2367 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2368 	return NULL;
2369 }
2370 
2371 static int
2372 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2373 {
2374 	return nlmsg_multicast(nls, skb, 0, group, gfp);
2375 }
2376 
2377 static int
2378 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2379 {
2380 	return nlmsg_unicast(nls, skb, portid);
2381 }
2382 
2383 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2384 		   char *data, uint32_t data_size)
2385 {
2386 	struct nlmsghdr	*nlh;
2387 	struct sk_buff *skb;
2388 	struct iscsi_uevent *ev;
2389 	char *pdu;
2390 	struct iscsi_internal *priv;
2391 	int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2392 				   data_size);
2393 
2394 	priv = iscsi_if_transport_lookup(conn->transport);
2395 	if (!priv)
2396 		return -EINVAL;
2397 
2398 	skb = alloc_skb(len, GFP_ATOMIC);
2399 	if (!skb) {
2400 		iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2401 		iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2402 				      "control PDU: OOM\n");
2403 		return -ENOMEM;
2404 	}
2405 
2406 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2407 	ev = nlmsg_data(nlh);
2408 	memset(ev, 0, sizeof(*ev));
2409 	ev->transport_handle = iscsi_handle(conn->transport);
2410 	ev->type = ISCSI_KEVENT_RECV_PDU;
2411 	ev->r.recv_req.cid = conn->cid;
2412 	ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2413 	pdu = (char*)ev + sizeof(*ev);
2414 	memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2415 	memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2416 
2417 	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2418 }
2419 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2420 
2421 int iscsi_offload_mesg(struct Scsi_Host *shost,
2422 		       struct iscsi_transport *transport, uint32_t type,
2423 		       char *data, uint16_t data_size)
2424 {
2425 	struct nlmsghdr	*nlh;
2426 	struct sk_buff *skb;
2427 	struct iscsi_uevent *ev;
2428 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2429 
2430 	skb = alloc_skb(len, GFP_ATOMIC);
2431 	if (!skb) {
2432 		printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2433 		return -ENOMEM;
2434 	}
2435 
2436 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2437 	ev = nlmsg_data(nlh);
2438 	memset(ev, 0, sizeof(*ev));
2439 	ev->type = type;
2440 	ev->transport_handle = iscsi_handle(transport);
2441 	switch (type) {
2442 	case ISCSI_KEVENT_PATH_REQ:
2443 		ev->r.req_path.host_no = shost->host_no;
2444 		break;
2445 	case ISCSI_KEVENT_IF_DOWN:
2446 		ev->r.notify_if_down.host_no = shost->host_no;
2447 		break;
2448 	}
2449 
2450 	memcpy((char *)ev + sizeof(*ev), data, data_size);
2451 
2452 	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2453 }
2454 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2455 
2456 /*
2457  * This can be called without the rx_queue_mutex, if invoked by the kernel
2458  * stop work. But, in that case, it is guaranteed not to race with
2459  * iscsi_destroy by conn_mutex.
2460  */
2461 static void iscsi_if_stop_conn(struct iscsi_cls_conn *conn, int flag)
2462 {
2463 	/*
2464 	 * It is important that this path doesn't rely on
2465 	 * rx_queue_mutex, otherwise, a thread doing allocation on a
2466 	 * start_session/start_connection could sleep waiting on a
2467 	 * writeback to a failed iscsi device, that cannot be recovered
2468 	 * because the lock is held.  If we don't hold it here, the
2469 	 * kernel stop_conn_work_fn has a chance to stop the broken
2470 	 * session and resolve the allocation.
2471 	 *
2472 	 * Still, the user invoked .stop_conn() needs to be serialized
2473 	 * with stop_conn_work_fn by a private mutex.  Not pretty, but
2474 	 * it works.
2475 	 */
2476 	mutex_lock(&conn_mutex);
2477 	conn->transport->stop_conn(conn, flag);
2478 	mutex_unlock(&conn_mutex);
2479 
2480 }
2481 
2482 static void stop_conn_work_fn(struct work_struct *work)
2483 {
2484 	struct iscsi_cls_conn *conn, *tmp;
2485 	unsigned long flags;
2486 	LIST_HEAD(recovery_list);
2487 
2488 	spin_lock_irqsave(&connlock, flags);
2489 	if (list_empty(&connlist_err)) {
2490 		spin_unlock_irqrestore(&connlock, flags);
2491 		return;
2492 	}
2493 	list_splice_init(&connlist_err, &recovery_list);
2494 	spin_unlock_irqrestore(&connlock, flags);
2495 
2496 	list_for_each_entry_safe(conn, tmp, &recovery_list, conn_list_err) {
2497 		uint32_t sid = iscsi_conn_get_sid(conn);
2498 		struct iscsi_cls_session *session;
2499 
2500 		session = iscsi_session_lookup(sid);
2501 		if (session) {
2502 			if (system_state != SYSTEM_RUNNING) {
2503 				session->recovery_tmo = 0;
2504 				iscsi_if_stop_conn(conn, STOP_CONN_TERM);
2505 			} else {
2506 				iscsi_if_stop_conn(conn, STOP_CONN_RECOVER);
2507 			}
2508 		}
2509 
2510 		list_del_init(&conn->conn_list_err);
2511 	}
2512 }
2513 
2514 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2515 {
2516 	struct nlmsghdr	*nlh;
2517 	struct sk_buff	*skb;
2518 	struct iscsi_uevent *ev;
2519 	struct iscsi_internal *priv;
2520 	int len = nlmsg_total_size(sizeof(*ev));
2521 	unsigned long flags;
2522 
2523 	spin_lock_irqsave(&connlock, flags);
2524 	list_add(&conn->conn_list_err, &connlist_err);
2525 	spin_unlock_irqrestore(&connlock, flags);
2526 	queue_work(system_unbound_wq, &stop_conn_work);
2527 
2528 	priv = iscsi_if_transport_lookup(conn->transport);
2529 	if (!priv)
2530 		return;
2531 
2532 	skb = alloc_skb(len, GFP_ATOMIC);
2533 	if (!skb) {
2534 		iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2535 				      "conn error (%d)\n", error);
2536 		return;
2537 	}
2538 
2539 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2540 	ev = nlmsg_data(nlh);
2541 	ev->transport_handle = iscsi_handle(conn->transport);
2542 	ev->type = ISCSI_KEVENT_CONN_ERROR;
2543 	ev->r.connerror.error = error;
2544 	ev->r.connerror.cid = conn->cid;
2545 	ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2546 
2547 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2548 
2549 	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2550 			      error);
2551 }
2552 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2553 
2554 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2555 			    enum iscsi_conn_state state)
2556 {
2557 	struct nlmsghdr *nlh;
2558 	struct sk_buff  *skb;
2559 	struct iscsi_uevent *ev;
2560 	struct iscsi_internal *priv;
2561 	int len = nlmsg_total_size(sizeof(*ev));
2562 
2563 	priv = iscsi_if_transport_lookup(conn->transport);
2564 	if (!priv)
2565 		return;
2566 
2567 	skb = alloc_skb(len, GFP_ATOMIC);
2568 	if (!skb) {
2569 		iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2570 				      "conn login (%d)\n", state);
2571 		return;
2572 	}
2573 
2574 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2575 	ev = nlmsg_data(nlh);
2576 	ev->transport_handle = iscsi_handle(conn->transport);
2577 	ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2578 	ev->r.conn_login.state = state;
2579 	ev->r.conn_login.cid = conn->cid;
2580 	ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2581 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2582 
2583 	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2584 			      state);
2585 }
2586 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2587 
2588 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2589 			   enum iscsi_host_event_code code, uint32_t data_size,
2590 			   uint8_t *data)
2591 {
2592 	struct nlmsghdr *nlh;
2593 	struct sk_buff *skb;
2594 	struct iscsi_uevent *ev;
2595 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2596 
2597 	skb = alloc_skb(len, GFP_NOIO);
2598 	if (!skb) {
2599 		printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2600 		       host_no, code);
2601 		return;
2602 	}
2603 
2604 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2605 	ev = nlmsg_data(nlh);
2606 	ev->transport_handle = iscsi_handle(transport);
2607 	ev->type = ISCSI_KEVENT_HOST_EVENT;
2608 	ev->r.host_event.host_no = host_no;
2609 	ev->r.host_event.code = code;
2610 	ev->r.host_event.data_size = data_size;
2611 
2612 	if (data_size)
2613 		memcpy((char *)ev + sizeof(*ev), data, data_size);
2614 
2615 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2616 }
2617 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2618 
2619 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2620 			   uint32_t status, uint32_t pid, uint32_t data_size,
2621 			   uint8_t *data)
2622 {
2623 	struct nlmsghdr *nlh;
2624 	struct sk_buff *skb;
2625 	struct iscsi_uevent *ev;
2626 	int len = nlmsg_total_size(sizeof(*ev) + data_size);
2627 
2628 	skb = alloc_skb(len, GFP_NOIO);
2629 	if (!skb) {
2630 		printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2631 		return;
2632 	}
2633 
2634 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2635 	ev = nlmsg_data(nlh);
2636 	ev->transport_handle = iscsi_handle(transport);
2637 	ev->type = ISCSI_KEVENT_PING_COMP;
2638 	ev->r.ping_comp.host_no = host_no;
2639 	ev->r.ping_comp.status = status;
2640 	ev->r.ping_comp.pid = pid;
2641 	ev->r.ping_comp.data_size = data_size;
2642 	memcpy((char *)ev + sizeof(*ev), data, data_size);
2643 
2644 	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2645 }
2646 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2647 
2648 static int
2649 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2650 {
2651 	struct sk_buff	*skb;
2652 	struct nlmsghdr	*nlh;
2653 	int len = nlmsg_total_size(size);
2654 
2655 	skb = alloc_skb(len, GFP_ATOMIC);
2656 	if (!skb) {
2657 		printk(KERN_ERR "Could not allocate skb to send reply.\n");
2658 		return -ENOMEM;
2659 	}
2660 
2661 	nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2662 	memcpy(nlmsg_data(nlh), payload, size);
2663 	return iscsi_unicast_skb(skb, portid);
2664 }
2665 
2666 static int
2667 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2668 {
2669 	struct iscsi_uevent *ev = nlmsg_data(nlh);
2670 	struct iscsi_stats *stats;
2671 	struct sk_buff *skbstat;
2672 	struct iscsi_cls_conn *conn;
2673 	struct nlmsghdr	*nlhstat;
2674 	struct iscsi_uevent *evstat;
2675 	struct iscsi_internal *priv;
2676 	int len = nlmsg_total_size(sizeof(*ev) +
2677 				   sizeof(struct iscsi_stats) +
2678 				   sizeof(struct iscsi_stats_custom) *
2679 				   ISCSI_STATS_CUSTOM_MAX);
2680 	int err = 0;
2681 
2682 	priv = iscsi_if_transport_lookup(transport);
2683 	if (!priv)
2684 		return -EINVAL;
2685 
2686 	conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2687 	if (!conn)
2688 		return -EEXIST;
2689 
2690 	do {
2691 		int actual_size;
2692 
2693 		skbstat = alloc_skb(len, GFP_ATOMIC);
2694 		if (!skbstat) {
2695 			iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2696 					      "deliver stats: OOM\n");
2697 			return -ENOMEM;
2698 		}
2699 
2700 		nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2701 				      (len - sizeof(*nlhstat)), 0);
2702 		evstat = nlmsg_data(nlhstat);
2703 		memset(evstat, 0, sizeof(*evstat));
2704 		evstat->transport_handle = iscsi_handle(conn->transport);
2705 		evstat->type = nlh->nlmsg_type;
2706 		evstat->u.get_stats.cid =
2707 			ev->u.get_stats.cid;
2708 		evstat->u.get_stats.sid =
2709 			ev->u.get_stats.sid;
2710 		stats = (struct iscsi_stats *)
2711 			((char*)evstat + sizeof(*evstat));
2712 		memset(stats, 0, sizeof(*stats));
2713 
2714 		transport->get_stats(conn, stats);
2715 		actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2716 					       sizeof(struct iscsi_stats) +
2717 					       sizeof(struct iscsi_stats_custom) *
2718 					       stats->custom_length);
2719 		actual_size -= sizeof(*nlhstat);
2720 		actual_size = nlmsg_msg_size(actual_size);
2721 		skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2722 		nlhstat->nlmsg_len = actual_size;
2723 
2724 		err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2725 					  GFP_ATOMIC);
2726 	} while (err < 0 && err != -ECONNREFUSED);
2727 
2728 	return err;
2729 }
2730 
2731 /**
2732  * iscsi_session_event - send session destr. completion event
2733  * @session: iscsi class session
2734  * @event: type of event
2735  */
2736 int iscsi_session_event(struct iscsi_cls_session *session,
2737 			enum iscsi_uevent_e event)
2738 {
2739 	struct iscsi_internal *priv;
2740 	struct Scsi_Host *shost;
2741 	struct iscsi_uevent *ev;
2742 	struct sk_buff  *skb;
2743 	struct nlmsghdr *nlh;
2744 	int rc, len = nlmsg_total_size(sizeof(*ev));
2745 
2746 	priv = iscsi_if_transport_lookup(session->transport);
2747 	if (!priv)
2748 		return -EINVAL;
2749 	shost = iscsi_session_to_shost(session);
2750 
2751 	skb = alloc_skb(len, GFP_KERNEL);
2752 	if (!skb) {
2753 		iscsi_cls_session_printk(KERN_ERR, session,
2754 					 "Cannot notify userspace of session "
2755 					 "event %u\n", event);
2756 		return -ENOMEM;
2757 	}
2758 
2759 	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2760 	ev = nlmsg_data(nlh);
2761 	ev->transport_handle = iscsi_handle(session->transport);
2762 
2763 	ev->type = event;
2764 	switch (event) {
2765 	case ISCSI_KEVENT_DESTROY_SESSION:
2766 		ev->r.d_session.host_no = shost->host_no;
2767 		ev->r.d_session.sid = session->sid;
2768 		break;
2769 	case ISCSI_KEVENT_CREATE_SESSION:
2770 		ev->r.c_session_ret.host_no = shost->host_no;
2771 		ev->r.c_session_ret.sid = session->sid;
2772 		break;
2773 	case ISCSI_KEVENT_UNBIND_SESSION:
2774 		ev->r.unbind_session.host_no = shost->host_no;
2775 		ev->r.unbind_session.sid = session->sid;
2776 		break;
2777 	default:
2778 		iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2779 					 "%u.\n", event);
2780 		kfree_skb(skb);
2781 		return -EINVAL;
2782 	}
2783 
2784 	/*
2785 	 * this will occur if the daemon is not up, so we just warn
2786 	 * the user and when the daemon is restarted it will handle it
2787 	 */
2788 	rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2789 	if (rc == -ESRCH)
2790 		iscsi_cls_session_printk(KERN_ERR, session,
2791 					 "Cannot notify userspace of session "
2792 					 "event %u. Check iscsi daemon\n",
2793 					 event);
2794 
2795 	ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2796 				event, rc);
2797 	return rc;
2798 }
2799 EXPORT_SYMBOL_GPL(iscsi_session_event);
2800 
2801 static int
2802 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2803 			struct iscsi_uevent *ev, pid_t pid,
2804 			uint32_t initial_cmdsn,	uint16_t cmds_max,
2805 			uint16_t queue_depth)
2806 {
2807 	struct iscsi_transport *transport = priv->iscsi_transport;
2808 	struct iscsi_cls_session *session;
2809 	struct Scsi_Host *shost;
2810 
2811 	session = transport->create_session(ep, cmds_max, queue_depth,
2812 					    initial_cmdsn);
2813 	if (!session)
2814 		return -ENOMEM;
2815 
2816 	session->creator = pid;
2817 	shost = iscsi_session_to_shost(session);
2818 	ev->r.c_session_ret.host_no = shost->host_no;
2819 	ev->r.c_session_ret.sid = session->sid;
2820 	ISCSI_DBG_TRANS_SESSION(session,
2821 				"Completed creating transport session\n");
2822 	return 0;
2823 }
2824 
2825 static int
2826 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2827 {
2828 	struct iscsi_cls_conn *conn;
2829 	struct iscsi_cls_session *session;
2830 
2831 	session = iscsi_session_lookup(ev->u.c_conn.sid);
2832 	if (!session) {
2833 		printk(KERN_ERR "iscsi: invalid session %d.\n",
2834 		       ev->u.c_conn.sid);
2835 		return -EINVAL;
2836 	}
2837 
2838 	conn = transport->create_conn(session, ev->u.c_conn.cid);
2839 	if (!conn) {
2840 		iscsi_cls_session_printk(KERN_ERR, session,
2841 					 "couldn't create a new connection.");
2842 		return -ENOMEM;
2843 	}
2844 
2845 	ev->r.c_conn_ret.sid = session->sid;
2846 	ev->r.c_conn_ret.cid = conn->cid;
2847 
2848 	ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2849 	return 0;
2850 }
2851 
2852 static int
2853 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2854 {
2855 	struct iscsi_cls_conn *conn;
2856 	unsigned long flags;
2857 
2858 	conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2859 	if (!conn)
2860 		return -EINVAL;
2861 
2862 	spin_lock_irqsave(&connlock, flags);
2863 	if (!list_empty(&conn->conn_list_err)) {
2864 		spin_unlock_irqrestore(&connlock, flags);
2865 		return -EAGAIN;
2866 	}
2867 	spin_unlock_irqrestore(&connlock, flags);
2868 
2869 	ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2870 
2871 	mutex_lock(&conn_mutex);
2872 	if (transport->destroy_conn)
2873 		transport->destroy_conn(conn);
2874 	mutex_unlock(&conn_mutex);
2875 
2876 	return 0;
2877 }
2878 
2879 static int
2880 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2881 {
2882 	char *data = (char*)ev + sizeof(*ev);
2883 	struct iscsi_cls_conn *conn;
2884 	struct iscsi_cls_session *session;
2885 	int err = 0, value = 0;
2886 
2887 	if (ev->u.set_param.len > PAGE_SIZE)
2888 		return -EINVAL;
2889 
2890 	session = iscsi_session_lookup(ev->u.set_param.sid);
2891 	conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2892 	if (!conn || !session)
2893 		return -EINVAL;
2894 
2895 	switch (ev->u.set_param.param) {
2896 	case ISCSI_PARAM_SESS_RECOVERY_TMO:
2897 		sscanf(data, "%d", &value);
2898 		if (!session->recovery_tmo_sysfs_override)
2899 			session->recovery_tmo = value;
2900 		break;
2901 	default:
2902 		err = transport->set_param(conn, ev->u.set_param.param,
2903 					   data, ev->u.set_param.len);
2904 	}
2905 
2906 	return err;
2907 }
2908 
2909 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2910 			       struct iscsi_uevent *ev, int msg_type)
2911 {
2912 	struct iscsi_endpoint *ep;
2913 	struct sockaddr *dst_addr;
2914 	struct Scsi_Host *shost = NULL;
2915 	int non_blocking, err = 0;
2916 
2917 	if (!transport->ep_connect)
2918 		return -EINVAL;
2919 
2920 	if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2921 		shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2922 		if (!shost) {
2923 			printk(KERN_ERR "ep connect failed. Could not find "
2924 			       "host no %u\n",
2925 			       ev->u.ep_connect_through_host.host_no);
2926 			return -ENODEV;
2927 		}
2928 		non_blocking = ev->u.ep_connect_through_host.non_blocking;
2929 	} else
2930 		non_blocking = ev->u.ep_connect.non_blocking;
2931 
2932 	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2933 	ep = transport->ep_connect(shost, dst_addr, non_blocking);
2934 	if (IS_ERR(ep)) {
2935 		err = PTR_ERR(ep);
2936 		goto release_host;
2937 	}
2938 
2939 	ev->r.ep_connect_ret.handle = ep->id;
2940 release_host:
2941 	if (shost)
2942 		scsi_host_put(shost);
2943 	return err;
2944 }
2945 
2946 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2947 				  u64 ep_handle)
2948 {
2949 	struct iscsi_cls_conn *conn;
2950 	struct iscsi_endpoint *ep;
2951 
2952 	if (!transport->ep_disconnect)
2953 		return -EINVAL;
2954 
2955 	ep = iscsi_lookup_endpoint(ep_handle);
2956 	if (!ep)
2957 		return -EINVAL;
2958 	conn = ep->conn;
2959 	if (conn) {
2960 		mutex_lock(&conn->ep_mutex);
2961 		conn->ep = NULL;
2962 		mutex_unlock(&conn->ep_mutex);
2963 	}
2964 
2965 	transport->ep_disconnect(ep);
2966 	return 0;
2967 }
2968 
2969 static int
2970 iscsi_if_transport_ep(struct iscsi_transport *transport,
2971 		      struct iscsi_uevent *ev, int msg_type)
2972 {
2973 	struct iscsi_endpoint *ep;
2974 	int rc = 0;
2975 
2976 	switch (msg_type) {
2977 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2978 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2979 		rc = iscsi_if_ep_connect(transport, ev, msg_type);
2980 		break;
2981 	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2982 		if (!transport->ep_poll)
2983 			return -EINVAL;
2984 
2985 		ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2986 		if (!ep)
2987 			return -EINVAL;
2988 
2989 		ev->r.retcode = transport->ep_poll(ep,
2990 						   ev->u.ep_poll.timeout_ms);
2991 		break;
2992 	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2993 		rc = iscsi_if_ep_disconnect(transport,
2994 					    ev->u.ep_disconnect.ep_handle);
2995 		break;
2996 	}
2997 	return rc;
2998 }
2999 
3000 static int
3001 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3002 		struct iscsi_uevent *ev)
3003 {
3004 	struct Scsi_Host *shost;
3005 	struct sockaddr *dst_addr;
3006 	int err;
3007 
3008 	if (!transport->tgt_dscvr)
3009 		return -EINVAL;
3010 
3011 	shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3012 	if (!shost) {
3013 		printk(KERN_ERR "target discovery could not find host no %u\n",
3014 		       ev->u.tgt_dscvr.host_no);
3015 		return -ENODEV;
3016 	}
3017 
3018 
3019 	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3020 	err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3021 				   ev->u.tgt_dscvr.enable, dst_addr);
3022 	scsi_host_put(shost);
3023 	return err;
3024 }
3025 
3026 static int
3027 iscsi_set_host_param(struct iscsi_transport *transport,
3028 		     struct iscsi_uevent *ev)
3029 {
3030 	char *data = (char*)ev + sizeof(*ev);
3031 	struct Scsi_Host *shost;
3032 	int err;
3033 
3034 	if (!transport->set_host_param)
3035 		return -ENOSYS;
3036 
3037 	if (ev->u.set_host_param.len > PAGE_SIZE)
3038 		return -EINVAL;
3039 
3040 	shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3041 	if (!shost) {
3042 		printk(KERN_ERR "set_host_param could not find host no %u\n",
3043 		       ev->u.set_host_param.host_no);
3044 		return -ENODEV;
3045 	}
3046 
3047 	err = transport->set_host_param(shost, ev->u.set_host_param.param,
3048 					data, ev->u.set_host_param.len);
3049 	scsi_host_put(shost);
3050 	return err;
3051 }
3052 
3053 static int
3054 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3055 {
3056 	struct Scsi_Host *shost;
3057 	struct iscsi_path *params;
3058 	int err;
3059 
3060 	if (!transport->set_path)
3061 		return -ENOSYS;
3062 
3063 	shost = scsi_host_lookup(ev->u.set_path.host_no);
3064 	if (!shost) {
3065 		printk(KERN_ERR "set path could not find host no %u\n",
3066 		       ev->u.set_path.host_no);
3067 		return -ENODEV;
3068 	}
3069 
3070 	params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3071 	err = transport->set_path(shost, params);
3072 
3073 	scsi_host_put(shost);
3074 	return err;
3075 }
3076 
3077 static int iscsi_session_has_conns(int sid)
3078 {
3079 	struct iscsi_cls_conn *conn;
3080 	unsigned long flags;
3081 	int found = 0;
3082 
3083 	spin_lock_irqsave(&connlock, flags);
3084 	list_for_each_entry(conn, &connlist, conn_list) {
3085 		if (iscsi_conn_get_sid(conn) == sid) {
3086 			found = 1;
3087 			break;
3088 		}
3089 	}
3090 	spin_unlock_irqrestore(&connlock, flags);
3091 
3092 	return found;
3093 }
3094 
3095 static int
3096 iscsi_set_iface_params(struct iscsi_transport *transport,
3097 		       struct iscsi_uevent *ev, uint32_t len)
3098 {
3099 	char *data = (char *)ev + sizeof(*ev);
3100 	struct Scsi_Host *shost;
3101 	int err;
3102 
3103 	if (!transport->set_iface_param)
3104 		return -ENOSYS;
3105 
3106 	shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3107 	if (!shost) {
3108 		printk(KERN_ERR "set_iface_params could not find host no %u\n",
3109 		       ev->u.set_iface_params.host_no);
3110 		return -ENODEV;
3111 	}
3112 
3113 	err = transport->set_iface_param(shost, data, len);
3114 	scsi_host_put(shost);
3115 	return err;
3116 }
3117 
3118 static int
3119 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3120 {
3121 	struct Scsi_Host *shost;
3122 	struct sockaddr *dst_addr;
3123 	int err;
3124 
3125 	if (!transport->send_ping)
3126 		return -ENOSYS;
3127 
3128 	shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3129 	if (!shost) {
3130 		printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3131 		       ev->u.iscsi_ping.host_no);
3132 		return -ENODEV;
3133 	}
3134 
3135 	dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3136 	err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3137 				   ev->u.iscsi_ping.iface_type,
3138 				   ev->u.iscsi_ping.payload_size,
3139 				   ev->u.iscsi_ping.pid,
3140 				   dst_addr);
3141 	scsi_host_put(shost);
3142 	return err;
3143 }
3144 
3145 static int
3146 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3147 {
3148 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3149 	struct Scsi_Host *shost = NULL;
3150 	struct iscsi_chap_rec *chap_rec;
3151 	struct iscsi_internal *priv;
3152 	struct sk_buff *skbchap;
3153 	struct nlmsghdr *nlhchap;
3154 	struct iscsi_uevent *evchap;
3155 	uint32_t chap_buf_size;
3156 	int len, err = 0;
3157 	char *buf;
3158 
3159 	if (!transport->get_chap)
3160 		return -EINVAL;
3161 
3162 	priv = iscsi_if_transport_lookup(transport);
3163 	if (!priv)
3164 		return -EINVAL;
3165 
3166 	chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3167 	len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3168 
3169 	shost = scsi_host_lookup(ev->u.get_chap.host_no);
3170 	if (!shost) {
3171 		printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3172 		       __func__, ev->u.get_chap.host_no);
3173 		return -ENODEV;
3174 	}
3175 
3176 	do {
3177 		int actual_size;
3178 
3179 		skbchap = alloc_skb(len, GFP_KERNEL);
3180 		if (!skbchap) {
3181 			printk(KERN_ERR "can not deliver chap: OOM\n");
3182 			err = -ENOMEM;
3183 			goto exit_get_chap;
3184 		}
3185 
3186 		nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3187 				      (len - sizeof(*nlhchap)), 0);
3188 		evchap = nlmsg_data(nlhchap);
3189 		memset(evchap, 0, sizeof(*evchap));
3190 		evchap->transport_handle = iscsi_handle(transport);
3191 		evchap->type = nlh->nlmsg_type;
3192 		evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3193 		evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3194 		evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3195 		buf = (char *)evchap + sizeof(*evchap);
3196 		memset(buf, 0, chap_buf_size);
3197 
3198 		err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3199 				    &evchap->u.get_chap.num_entries, buf);
3200 
3201 		actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3202 		skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3203 		nlhchap->nlmsg_len = actual_size;
3204 
3205 		err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3206 					  GFP_KERNEL);
3207 	} while (err < 0 && err != -ECONNREFUSED);
3208 
3209 exit_get_chap:
3210 	scsi_host_put(shost);
3211 	return err;
3212 }
3213 
3214 static int iscsi_set_chap(struct iscsi_transport *transport,
3215 			  struct iscsi_uevent *ev, uint32_t len)
3216 {
3217 	char *data = (char *)ev + sizeof(*ev);
3218 	struct Scsi_Host *shost;
3219 	int err = 0;
3220 
3221 	if (!transport->set_chap)
3222 		return -ENOSYS;
3223 
3224 	shost = scsi_host_lookup(ev->u.set_path.host_no);
3225 	if (!shost) {
3226 		pr_err("%s could not find host no %u\n",
3227 		       __func__, ev->u.set_path.host_no);
3228 		return -ENODEV;
3229 	}
3230 
3231 	err = transport->set_chap(shost, data, len);
3232 	scsi_host_put(shost);
3233 	return err;
3234 }
3235 
3236 static int iscsi_delete_chap(struct iscsi_transport *transport,
3237 			     struct iscsi_uevent *ev)
3238 {
3239 	struct Scsi_Host *shost;
3240 	int err = 0;
3241 
3242 	if (!transport->delete_chap)
3243 		return -ENOSYS;
3244 
3245 	shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3246 	if (!shost) {
3247 		printk(KERN_ERR "%s could not find host no %u\n",
3248 		       __func__, ev->u.delete_chap.host_no);
3249 		return -ENODEV;
3250 	}
3251 
3252 	err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3253 	scsi_host_put(shost);
3254 	return err;
3255 }
3256 
3257 static const struct {
3258 	enum iscsi_discovery_parent_type value;
3259 	char				*name;
3260 } iscsi_discovery_parent_names[] = {
3261 	{ISCSI_DISC_PARENT_UNKNOWN,	"Unknown" },
3262 	{ISCSI_DISC_PARENT_SENDTGT,	"Sendtarget" },
3263 	{ISCSI_DISC_PARENT_ISNS,	"isns" },
3264 };
3265 
3266 char *iscsi_get_discovery_parent_name(int parent_type)
3267 {
3268 	int i;
3269 	char *state = "Unknown!";
3270 
3271 	for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3272 		if (iscsi_discovery_parent_names[i].value & parent_type) {
3273 			state = iscsi_discovery_parent_names[i].name;
3274 			break;
3275 		}
3276 	}
3277 	return state;
3278 }
3279 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3280 
3281 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3282 				     struct iscsi_uevent *ev, uint32_t len)
3283 {
3284 	char *data = (char *)ev + sizeof(*ev);
3285 	struct Scsi_Host *shost;
3286 	struct iscsi_bus_flash_session *fnode_sess;
3287 	struct iscsi_bus_flash_conn *fnode_conn;
3288 	struct device *dev;
3289 	uint32_t idx;
3290 	int err = 0;
3291 
3292 	if (!transport->set_flashnode_param) {
3293 		err = -ENOSYS;
3294 		goto exit_set_fnode;
3295 	}
3296 
3297 	shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3298 	if (!shost) {
3299 		pr_err("%s could not find host no %u\n",
3300 		       __func__, ev->u.set_flashnode.host_no);
3301 		err = -ENODEV;
3302 		goto exit_set_fnode;
3303 	}
3304 
3305 	idx = ev->u.set_flashnode.flashnode_idx;
3306 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3307 	if (!fnode_sess) {
3308 		pr_err("%s could not find flashnode %u for host no %u\n",
3309 		       __func__, idx, ev->u.set_flashnode.host_no);
3310 		err = -ENODEV;
3311 		goto put_host;
3312 	}
3313 
3314 	dev = iscsi_find_flashnode_conn(fnode_sess);
3315 	if (!dev) {
3316 		err = -ENODEV;
3317 		goto put_sess;
3318 	}
3319 
3320 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3321 	err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3322 	put_device(dev);
3323 
3324 put_sess:
3325 	put_device(&fnode_sess->dev);
3326 
3327 put_host:
3328 	scsi_host_put(shost);
3329 
3330 exit_set_fnode:
3331 	return err;
3332 }
3333 
3334 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3335 			       struct iscsi_uevent *ev, uint32_t len)
3336 {
3337 	char *data = (char *)ev + sizeof(*ev);
3338 	struct Scsi_Host *shost;
3339 	int index;
3340 	int err = 0;
3341 
3342 	if (!transport->new_flashnode) {
3343 		err = -ENOSYS;
3344 		goto exit_new_fnode;
3345 	}
3346 
3347 	shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3348 	if (!shost) {
3349 		pr_err("%s could not find host no %u\n",
3350 		       __func__, ev->u.new_flashnode.host_no);
3351 		err = -ENODEV;
3352 		goto put_host;
3353 	}
3354 
3355 	index = transport->new_flashnode(shost, data, len);
3356 
3357 	if (index >= 0)
3358 		ev->r.new_flashnode_ret.flashnode_idx = index;
3359 	else
3360 		err = -EIO;
3361 
3362 put_host:
3363 	scsi_host_put(shost);
3364 
3365 exit_new_fnode:
3366 	return err;
3367 }
3368 
3369 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3370 			       struct iscsi_uevent *ev)
3371 {
3372 	struct Scsi_Host *shost;
3373 	struct iscsi_bus_flash_session *fnode_sess;
3374 	uint32_t idx;
3375 	int err = 0;
3376 
3377 	if (!transport->del_flashnode) {
3378 		err = -ENOSYS;
3379 		goto exit_del_fnode;
3380 	}
3381 
3382 	shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3383 	if (!shost) {
3384 		pr_err("%s could not find host no %u\n",
3385 		       __func__, ev->u.del_flashnode.host_no);
3386 		err = -ENODEV;
3387 		goto put_host;
3388 	}
3389 
3390 	idx = ev->u.del_flashnode.flashnode_idx;
3391 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3392 	if (!fnode_sess) {
3393 		pr_err("%s could not find flashnode %u for host no %u\n",
3394 		       __func__, idx, ev->u.del_flashnode.host_no);
3395 		err = -ENODEV;
3396 		goto put_host;
3397 	}
3398 
3399 	err = transport->del_flashnode(fnode_sess);
3400 	put_device(&fnode_sess->dev);
3401 
3402 put_host:
3403 	scsi_host_put(shost);
3404 
3405 exit_del_fnode:
3406 	return err;
3407 }
3408 
3409 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3410 				 struct iscsi_uevent *ev)
3411 {
3412 	struct Scsi_Host *shost;
3413 	struct iscsi_bus_flash_session *fnode_sess;
3414 	struct iscsi_bus_flash_conn *fnode_conn;
3415 	struct device *dev;
3416 	uint32_t idx;
3417 	int err = 0;
3418 
3419 	if (!transport->login_flashnode) {
3420 		err = -ENOSYS;
3421 		goto exit_login_fnode;
3422 	}
3423 
3424 	shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3425 	if (!shost) {
3426 		pr_err("%s could not find host no %u\n",
3427 		       __func__, ev->u.login_flashnode.host_no);
3428 		err = -ENODEV;
3429 		goto put_host;
3430 	}
3431 
3432 	idx = ev->u.login_flashnode.flashnode_idx;
3433 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3434 	if (!fnode_sess) {
3435 		pr_err("%s could not find flashnode %u for host no %u\n",
3436 		       __func__, idx, ev->u.login_flashnode.host_no);
3437 		err = -ENODEV;
3438 		goto put_host;
3439 	}
3440 
3441 	dev = iscsi_find_flashnode_conn(fnode_sess);
3442 	if (!dev) {
3443 		err = -ENODEV;
3444 		goto put_sess;
3445 	}
3446 
3447 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3448 	err = transport->login_flashnode(fnode_sess, fnode_conn);
3449 	put_device(dev);
3450 
3451 put_sess:
3452 	put_device(&fnode_sess->dev);
3453 
3454 put_host:
3455 	scsi_host_put(shost);
3456 
3457 exit_login_fnode:
3458 	return err;
3459 }
3460 
3461 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3462 				  struct iscsi_uevent *ev)
3463 {
3464 	struct Scsi_Host *shost;
3465 	struct iscsi_bus_flash_session *fnode_sess;
3466 	struct iscsi_bus_flash_conn *fnode_conn;
3467 	struct device *dev;
3468 	uint32_t idx;
3469 	int err = 0;
3470 
3471 	if (!transport->logout_flashnode) {
3472 		err = -ENOSYS;
3473 		goto exit_logout_fnode;
3474 	}
3475 
3476 	shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3477 	if (!shost) {
3478 		pr_err("%s could not find host no %u\n",
3479 		       __func__, ev->u.logout_flashnode.host_no);
3480 		err = -ENODEV;
3481 		goto put_host;
3482 	}
3483 
3484 	idx = ev->u.logout_flashnode.flashnode_idx;
3485 	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3486 	if (!fnode_sess) {
3487 		pr_err("%s could not find flashnode %u for host no %u\n",
3488 		       __func__, idx, ev->u.logout_flashnode.host_no);
3489 		err = -ENODEV;
3490 		goto put_host;
3491 	}
3492 
3493 	dev = iscsi_find_flashnode_conn(fnode_sess);
3494 	if (!dev) {
3495 		err = -ENODEV;
3496 		goto put_sess;
3497 	}
3498 
3499 	fnode_conn = iscsi_dev_to_flash_conn(dev);
3500 
3501 	err = transport->logout_flashnode(fnode_sess, fnode_conn);
3502 	put_device(dev);
3503 
3504 put_sess:
3505 	put_device(&fnode_sess->dev);
3506 
3507 put_host:
3508 	scsi_host_put(shost);
3509 
3510 exit_logout_fnode:
3511 	return err;
3512 }
3513 
3514 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3515 				      struct iscsi_uevent *ev)
3516 {
3517 	struct Scsi_Host *shost;
3518 	struct iscsi_cls_session *session;
3519 	int err = 0;
3520 
3521 	if (!transport->logout_flashnode_sid) {
3522 		err = -ENOSYS;
3523 		goto exit_logout_sid;
3524 	}
3525 
3526 	shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3527 	if (!shost) {
3528 		pr_err("%s could not find host no %u\n",
3529 		       __func__, ev->u.logout_flashnode.host_no);
3530 		err = -ENODEV;
3531 		goto put_host;
3532 	}
3533 
3534 	session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3535 	if (!session) {
3536 		pr_err("%s could not find session id %u\n",
3537 		       __func__, ev->u.logout_flashnode_sid.sid);
3538 		err = -EINVAL;
3539 		goto put_host;
3540 	}
3541 
3542 	err = transport->logout_flashnode_sid(session);
3543 
3544 put_host:
3545 	scsi_host_put(shost);
3546 
3547 exit_logout_sid:
3548 	return err;
3549 }
3550 
3551 static int
3552 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3553 {
3554 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3555 	struct Scsi_Host *shost = NULL;
3556 	struct iscsi_internal *priv;
3557 	struct sk_buff *skbhost_stats;
3558 	struct nlmsghdr *nlhhost_stats;
3559 	struct iscsi_uevent *evhost_stats;
3560 	int host_stats_size = 0;
3561 	int len, err = 0;
3562 	char *buf;
3563 
3564 	if (!transport->get_host_stats)
3565 		return -ENOSYS;
3566 
3567 	priv = iscsi_if_transport_lookup(transport);
3568 	if (!priv)
3569 		return -EINVAL;
3570 
3571 	host_stats_size = sizeof(struct iscsi_offload_host_stats);
3572 	len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3573 
3574 	shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3575 	if (!shost) {
3576 		pr_err("%s: failed. Could not find host no %u\n",
3577 		       __func__, ev->u.get_host_stats.host_no);
3578 		return -ENODEV;
3579 	}
3580 
3581 	do {
3582 		int actual_size;
3583 
3584 		skbhost_stats = alloc_skb(len, GFP_KERNEL);
3585 		if (!skbhost_stats) {
3586 			pr_err("cannot deliver host stats: OOM\n");
3587 			err = -ENOMEM;
3588 			goto exit_host_stats;
3589 		}
3590 
3591 		nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3592 				      (len - sizeof(*nlhhost_stats)), 0);
3593 		evhost_stats = nlmsg_data(nlhhost_stats);
3594 		memset(evhost_stats, 0, sizeof(*evhost_stats));
3595 		evhost_stats->transport_handle = iscsi_handle(transport);
3596 		evhost_stats->type = nlh->nlmsg_type;
3597 		evhost_stats->u.get_host_stats.host_no =
3598 					ev->u.get_host_stats.host_no;
3599 		buf = (char *)evhost_stats + sizeof(*evhost_stats);
3600 		memset(buf, 0, host_stats_size);
3601 
3602 		err = transport->get_host_stats(shost, buf, host_stats_size);
3603 		if (err) {
3604 			kfree_skb(skbhost_stats);
3605 			goto exit_host_stats;
3606 		}
3607 
3608 		actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3609 		skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3610 		nlhhost_stats->nlmsg_len = actual_size;
3611 
3612 		err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3613 					  GFP_KERNEL);
3614 	} while (err < 0 && err != -ECONNREFUSED);
3615 
3616 exit_host_stats:
3617 	scsi_host_put(shost);
3618 	return err;
3619 }
3620 
3621 
3622 static int
3623 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3624 {
3625 	int err = 0;
3626 	u32 portid;
3627 	u32 pdu_len;
3628 	struct iscsi_uevent *ev = nlmsg_data(nlh);
3629 	struct iscsi_transport *transport = NULL;
3630 	struct iscsi_internal *priv;
3631 	struct iscsi_cls_session *session;
3632 	struct iscsi_cls_conn *conn;
3633 	struct iscsi_endpoint *ep = NULL;
3634 
3635 	if (!netlink_capable(skb, CAP_SYS_ADMIN))
3636 		return -EPERM;
3637 
3638 	if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3639 		*group = ISCSI_NL_GRP_UIP;
3640 	else
3641 		*group = ISCSI_NL_GRP_ISCSID;
3642 
3643 	priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3644 	if (!priv)
3645 		return -EINVAL;
3646 	transport = priv->iscsi_transport;
3647 
3648 	if (!try_module_get(transport->owner))
3649 		return -EINVAL;
3650 
3651 	portid = NETLINK_CB(skb).portid;
3652 
3653 	switch (nlh->nlmsg_type) {
3654 	case ISCSI_UEVENT_CREATE_SESSION:
3655 		err = iscsi_if_create_session(priv, ep, ev,
3656 					      portid,
3657 					      ev->u.c_session.initial_cmdsn,
3658 					      ev->u.c_session.cmds_max,
3659 					      ev->u.c_session.queue_depth);
3660 		break;
3661 	case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3662 		ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3663 		if (!ep) {
3664 			err = -EINVAL;
3665 			break;
3666 		}
3667 
3668 		err = iscsi_if_create_session(priv, ep, ev,
3669 					portid,
3670 					ev->u.c_bound_session.initial_cmdsn,
3671 					ev->u.c_bound_session.cmds_max,
3672 					ev->u.c_bound_session.queue_depth);
3673 		break;
3674 	case ISCSI_UEVENT_DESTROY_SESSION:
3675 		session = iscsi_session_lookup(ev->u.d_session.sid);
3676 		if (!session)
3677 			err = -EINVAL;
3678 		else if (iscsi_session_has_conns(ev->u.d_session.sid))
3679 			err = -EBUSY;
3680 		else
3681 			transport->destroy_session(session);
3682 		break;
3683 	case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3684 		session = iscsi_session_lookup(ev->u.d_session.sid);
3685 		if (!session)
3686 			err = -EINVAL;
3687 		else if (iscsi_session_has_conns(ev->u.d_session.sid))
3688 			err = -EBUSY;
3689 		else {
3690 			unsigned long flags;
3691 
3692 			/* Prevent this session from being found again */
3693 			spin_lock_irqsave(&sesslock, flags);
3694 			list_del_init(&session->sess_list);
3695 			spin_unlock_irqrestore(&sesslock, flags);
3696 
3697 			queue_work(iscsi_destroy_workq, &session->destroy_work);
3698 		}
3699 		break;
3700 	case ISCSI_UEVENT_UNBIND_SESSION:
3701 		session = iscsi_session_lookup(ev->u.d_session.sid);
3702 		if (session)
3703 			scsi_queue_work(iscsi_session_to_shost(session),
3704 					&session->unbind_work);
3705 		else
3706 			err = -EINVAL;
3707 		break;
3708 	case ISCSI_UEVENT_CREATE_CONN:
3709 		err = iscsi_if_create_conn(transport, ev);
3710 		break;
3711 	case ISCSI_UEVENT_DESTROY_CONN:
3712 		err = iscsi_if_destroy_conn(transport, ev);
3713 		break;
3714 	case ISCSI_UEVENT_BIND_CONN:
3715 		session = iscsi_session_lookup(ev->u.b_conn.sid);
3716 		conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3717 
3718 		if (conn && conn->ep)
3719 			iscsi_if_ep_disconnect(transport, conn->ep->id);
3720 
3721 		if (!session || !conn) {
3722 			err = -EINVAL;
3723 			break;
3724 		}
3725 
3726 		mutex_lock(&conn_mutex);
3727 		ev->r.retcode =	transport->bind_conn(session, conn,
3728 						ev->u.b_conn.transport_eph,
3729 						ev->u.b_conn.is_leading);
3730 		mutex_unlock(&conn_mutex);
3731 
3732 		if (ev->r.retcode || !transport->ep_connect)
3733 			break;
3734 
3735 		ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3736 		if (ep) {
3737 			ep->conn = conn;
3738 
3739 			mutex_lock(&conn->ep_mutex);
3740 			conn->ep = ep;
3741 			mutex_unlock(&conn->ep_mutex);
3742 		} else
3743 			iscsi_cls_conn_printk(KERN_ERR, conn,
3744 					      "Could not set ep conn "
3745 					      "binding\n");
3746 		break;
3747 	case ISCSI_UEVENT_SET_PARAM:
3748 		err = iscsi_set_param(transport, ev);
3749 		break;
3750 	case ISCSI_UEVENT_START_CONN:
3751 		conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3752 		if (conn) {
3753 			mutex_lock(&conn_mutex);
3754 			ev->r.retcode = transport->start_conn(conn);
3755 			if (!ev->r.retcode)
3756 				conn->state = ISCSI_CONN_UP;
3757 			mutex_unlock(&conn_mutex);
3758 		}
3759 		else
3760 			err = -EINVAL;
3761 		break;
3762 	case ISCSI_UEVENT_STOP_CONN:
3763 		conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3764 		if (conn)
3765 			iscsi_if_stop_conn(conn, ev->u.stop_conn.flag);
3766 		else
3767 			err = -EINVAL;
3768 		break;
3769 	case ISCSI_UEVENT_SEND_PDU:
3770 		pdu_len = nlh->nlmsg_len - sizeof(*nlh) - sizeof(*ev);
3771 
3772 		if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3773 		    (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3774 			err = -EINVAL;
3775 			break;
3776 		}
3777 
3778 		conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3779 		if (conn) {
3780 			mutex_lock(&conn_mutex);
3781 			ev->r.retcode =	transport->send_pdu(conn,
3782 				(struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3783 				(char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3784 				ev->u.send_pdu.data_size);
3785 			mutex_unlock(&conn_mutex);
3786 		}
3787 		else
3788 			err = -EINVAL;
3789 		break;
3790 	case ISCSI_UEVENT_GET_STATS:
3791 		err = iscsi_if_get_stats(transport, nlh);
3792 		break;
3793 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3794 	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3795 	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3796 	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3797 		err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3798 		break;
3799 	case ISCSI_UEVENT_TGT_DSCVR:
3800 		err = iscsi_tgt_dscvr(transport, ev);
3801 		break;
3802 	case ISCSI_UEVENT_SET_HOST_PARAM:
3803 		err = iscsi_set_host_param(transport, ev);
3804 		break;
3805 	case ISCSI_UEVENT_PATH_UPDATE:
3806 		err = iscsi_set_path(transport, ev);
3807 		break;
3808 	case ISCSI_UEVENT_SET_IFACE_PARAMS:
3809 		err = iscsi_set_iface_params(transport, ev,
3810 					     nlmsg_attrlen(nlh, sizeof(*ev)));
3811 		break;
3812 	case ISCSI_UEVENT_PING:
3813 		err = iscsi_send_ping(transport, ev);
3814 		break;
3815 	case ISCSI_UEVENT_GET_CHAP:
3816 		err = iscsi_get_chap(transport, nlh);
3817 		break;
3818 	case ISCSI_UEVENT_DELETE_CHAP:
3819 		err = iscsi_delete_chap(transport, ev);
3820 		break;
3821 	case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3822 		err = iscsi_set_flashnode_param(transport, ev,
3823 						nlmsg_attrlen(nlh,
3824 							      sizeof(*ev)));
3825 		break;
3826 	case ISCSI_UEVENT_NEW_FLASHNODE:
3827 		err = iscsi_new_flashnode(transport, ev,
3828 					  nlmsg_attrlen(nlh, sizeof(*ev)));
3829 		break;
3830 	case ISCSI_UEVENT_DEL_FLASHNODE:
3831 		err = iscsi_del_flashnode(transport, ev);
3832 		break;
3833 	case ISCSI_UEVENT_LOGIN_FLASHNODE:
3834 		err = iscsi_login_flashnode(transport, ev);
3835 		break;
3836 	case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3837 		err = iscsi_logout_flashnode(transport, ev);
3838 		break;
3839 	case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3840 		err = iscsi_logout_flashnode_sid(transport, ev);
3841 		break;
3842 	case ISCSI_UEVENT_SET_CHAP:
3843 		err = iscsi_set_chap(transport, ev,
3844 				     nlmsg_attrlen(nlh, sizeof(*ev)));
3845 		break;
3846 	case ISCSI_UEVENT_GET_HOST_STATS:
3847 		err = iscsi_get_host_stats(transport, nlh);
3848 		break;
3849 	default:
3850 		err = -ENOSYS;
3851 		break;
3852 	}
3853 
3854 	module_put(transport->owner);
3855 	return err;
3856 }
3857 
3858 /*
3859  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3860  * Malformed skbs with wrong lengths or invalid creds are not processed.
3861  */
3862 static void
3863 iscsi_if_rx(struct sk_buff *skb)
3864 {
3865 	u32 portid = NETLINK_CB(skb).portid;
3866 
3867 	mutex_lock(&rx_queue_mutex);
3868 	while (skb->len >= NLMSG_HDRLEN) {
3869 		int err;
3870 		uint32_t rlen;
3871 		struct nlmsghdr	*nlh;
3872 		struct iscsi_uevent *ev;
3873 		uint32_t group;
3874 		int retries = ISCSI_SEND_MAX_ALLOWED;
3875 
3876 		nlh = nlmsg_hdr(skb);
3877 		if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3878 		    skb->len < nlh->nlmsg_len) {
3879 			break;
3880 		}
3881 
3882 		ev = nlmsg_data(nlh);
3883 		rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3884 		if (rlen > skb->len)
3885 			rlen = skb->len;
3886 
3887 		err = iscsi_if_recv_msg(skb, nlh, &group);
3888 		if (err) {
3889 			ev->type = ISCSI_KEVENT_IF_ERROR;
3890 			ev->iferror = err;
3891 		}
3892 		do {
3893 			/*
3894 			 * special case for GET_STATS:
3895 			 * on success - sending reply and stats from
3896 			 * inside of if_recv_msg(),
3897 			 * on error - fall through.
3898 			 */
3899 			if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3900 				break;
3901 			if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3902 				break;
3903 			err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
3904 						  ev, sizeof(*ev));
3905 			if (err == -EAGAIN && --retries < 0) {
3906 				printk(KERN_WARNING "Send reply failed, error %d\n", err);
3907 				break;
3908 			}
3909 		} while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3910 		skb_pull(skb, rlen);
3911 	}
3912 	mutex_unlock(&rx_queue_mutex);
3913 }
3914 
3915 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)		\
3916 struct device_attribute dev_attr_##_prefix##_##_name =	\
3917 	__ATTR(_name,_mode,_show,_store)
3918 
3919 /*
3920  * iSCSI connection attrs
3921  */
3922 #define iscsi_conn_attr_show(param)					\
3923 static ssize_t								\
3924 show_conn_param_##param(struct device *dev, 				\
3925 			struct device_attribute *attr, char *buf)	\
3926 {									\
3927 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);	\
3928 	struct iscsi_transport *t = conn->transport;			\
3929 	return t->get_conn_param(conn, param, buf);			\
3930 }
3931 
3932 #define iscsi_conn_attr(field, param)					\
3933 	iscsi_conn_attr_show(param)					\
3934 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,	\
3935 			NULL);
3936 
3937 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3938 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3939 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3940 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3941 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3942 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3943 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3944 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3945 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3946 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3947 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3948 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3949 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3950 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3951 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3952 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3953 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3954 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3955 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3956 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3957 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3958 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3959 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3960 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3961 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3962 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3963 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3964 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3965 
3966 static const char *const connection_state_names[] = {
3967 	[ISCSI_CONN_UP] = "up",
3968 	[ISCSI_CONN_DOWN] = "down",
3969 	[ISCSI_CONN_FAILED] = "failed"
3970 };
3971 
3972 static ssize_t show_conn_state(struct device *dev,
3973 			       struct device_attribute *attr, char *buf)
3974 {
3975 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
3976 	const char *state = "unknown";
3977 
3978 	if (conn->state >= 0 &&
3979 	    conn->state < ARRAY_SIZE(connection_state_names))
3980 		state = connection_state_names[conn->state];
3981 
3982 	return sysfs_emit(buf, "%s\n", state);
3983 }
3984 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
3985 			NULL);
3986 
3987 #define iscsi_conn_ep_attr_show(param)					\
3988 static ssize_t show_conn_ep_param_##param(struct device *dev,		\
3989 					  struct device_attribute *attr,\
3990 					  char *buf)			\
3991 {									\
3992 	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);	\
3993 	struct iscsi_transport *t = conn->transport;			\
3994 	struct iscsi_endpoint *ep;					\
3995 	ssize_t rc;							\
3996 									\
3997 	/*								\
3998 	 * Need to make sure ep_disconnect does not free the LLD's	\
3999 	 * interconnect resources while we are trying to read them.	\
4000 	 */								\
4001 	mutex_lock(&conn->ep_mutex);					\
4002 	ep = conn->ep;							\
4003 	if (!ep && t->ep_connect) {					\
4004 		mutex_unlock(&conn->ep_mutex);				\
4005 		return -ENOTCONN;					\
4006 	}								\
4007 									\
4008 	if (ep)								\
4009 		rc = t->get_ep_param(ep, param, buf);			\
4010 	else								\
4011 		rc = t->get_conn_param(conn, param, buf);		\
4012 	mutex_unlock(&conn->ep_mutex);					\
4013 	return rc;							\
4014 }
4015 
4016 #define iscsi_conn_ep_attr(field, param)				\
4017 	iscsi_conn_ep_attr_show(param)					\
4018 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,				\
4019 			show_conn_ep_param_##param, NULL);
4020 
4021 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4022 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4023 
4024 static struct attribute *iscsi_conn_attrs[] = {
4025 	&dev_attr_conn_max_recv_dlength.attr,
4026 	&dev_attr_conn_max_xmit_dlength.attr,
4027 	&dev_attr_conn_header_digest.attr,
4028 	&dev_attr_conn_data_digest.attr,
4029 	&dev_attr_conn_ifmarker.attr,
4030 	&dev_attr_conn_ofmarker.attr,
4031 	&dev_attr_conn_address.attr,
4032 	&dev_attr_conn_port.attr,
4033 	&dev_attr_conn_exp_statsn.attr,
4034 	&dev_attr_conn_persistent_address.attr,
4035 	&dev_attr_conn_persistent_port.attr,
4036 	&dev_attr_conn_ping_tmo.attr,
4037 	&dev_attr_conn_recv_tmo.attr,
4038 	&dev_attr_conn_local_port.attr,
4039 	&dev_attr_conn_statsn.attr,
4040 	&dev_attr_conn_keepalive_tmo.attr,
4041 	&dev_attr_conn_max_segment_size.attr,
4042 	&dev_attr_conn_tcp_timestamp_stat.attr,
4043 	&dev_attr_conn_tcp_wsf_disable.attr,
4044 	&dev_attr_conn_tcp_nagle_disable.attr,
4045 	&dev_attr_conn_tcp_timer_scale.attr,
4046 	&dev_attr_conn_tcp_timestamp_enable.attr,
4047 	&dev_attr_conn_fragment_disable.attr,
4048 	&dev_attr_conn_ipv4_tos.attr,
4049 	&dev_attr_conn_ipv6_traffic_class.attr,
4050 	&dev_attr_conn_ipv6_flow_label.attr,
4051 	&dev_attr_conn_is_fw_assigned_ipv6.attr,
4052 	&dev_attr_conn_tcp_xmit_wsf.attr,
4053 	&dev_attr_conn_tcp_recv_wsf.attr,
4054 	&dev_attr_conn_local_ipaddr.attr,
4055 	&dev_attr_conn_state.attr,
4056 	NULL,
4057 };
4058 
4059 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4060 					 struct attribute *attr, int i)
4061 {
4062 	struct device *cdev = container_of(kobj, struct device, kobj);
4063 	struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4064 	struct iscsi_transport *t = conn->transport;
4065 	int param;
4066 
4067 	if (attr == &dev_attr_conn_max_recv_dlength.attr)
4068 		param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4069 	else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4070 		param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4071 	else if (attr == &dev_attr_conn_header_digest.attr)
4072 		param = ISCSI_PARAM_HDRDGST_EN;
4073 	else if (attr == &dev_attr_conn_data_digest.attr)
4074 		param = ISCSI_PARAM_DATADGST_EN;
4075 	else if (attr == &dev_attr_conn_ifmarker.attr)
4076 		param = ISCSI_PARAM_IFMARKER_EN;
4077 	else if (attr == &dev_attr_conn_ofmarker.attr)
4078 		param = ISCSI_PARAM_OFMARKER_EN;
4079 	else if (attr == &dev_attr_conn_address.attr)
4080 		param = ISCSI_PARAM_CONN_ADDRESS;
4081 	else if (attr == &dev_attr_conn_port.attr)
4082 		param = ISCSI_PARAM_CONN_PORT;
4083 	else if (attr == &dev_attr_conn_exp_statsn.attr)
4084 		param = ISCSI_PARAM_EXP_STATSN;
4085 	else if (attr == &dev_attr_conn_persistent_address.attr)
4086 		param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4087 	else if (attr == &dev_attr_conn_persistent_port.attr)
4088 		param = ISCSI_PARAM_PERSISTENT_PORT;
4089 	else if (attr == &dev_attr_conn_ping_tmo.attr)
4090 		param = ISCSI_PARAM_PING_TMO;
4091 	else if (attr == &dev_attr_conn_recv_tmo.attr)
4092 		param = ISCSI_PARAM_RECV_TMO;
4093 	else if (attr == &dev_attr_conn_local_port.attr)
4094 		param = ISCSI_PARAM_LOCAL_PORT;
4095 	else if (attr == &dev_attr_conn_statsn.attr)
4096 		param = ISCSI_PARAM_STATSN;
4097 	else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4098 		param = ISCSI_PARAM_KEEPALIVE_TMO;
4099 	else if (attr == &dev_attr_conn_max_segment_size.attr)
4100 		param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4101 	else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4102 		param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4103 	else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4104 		param = ISCSI_PARAM_TCP_WSF_DISABLE;
4105 	else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4106 		param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4107 	else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4108 		param = ISCSI_PARAM_TCP_TIMER_SCALE;
4109 	else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4110 		param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4111 	else if (attr == &dev_attr_conn_fragment_disable.attr)
4112 		param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4113 	else if (attr == &dev_attr_conn_ipv4_tos.attr)
4114 		param = ISCSI_PARAM_IPV4_TOS;
4115 	else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4116 		param = ISCSI_PARAM_IPV6_TC;
4117 	else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4118 		param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4119 	else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4120 		param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4121 	else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4122 		param = ISCSI_PARAM_TCP_XMIT_WSF;
4123 	else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4124 		param = ISCSI_PARAM_TCP_RECV_WSF;
4125 	else if (attr == &dev_attr_conn_local_ipaddr.attr)
4126 		param = ISCSI_PARAM_LOCAL_IPADDR;
4127 	else if (attr == &dev_attr_conn_state.attr)
4128 		return S_IRUGO;
4129 	else {
4130 		WARN_ONCE(1, "Invalid conn attr");
4131 		return 0;
4132 	}
4133 
4134 	return t->attr_is_visible(ISCSI_PARAM, param);
4135 }
4136 
4137 static struct attribute_group iscsi_conn_group = {
4138 	.attrs = iscsi_conn_attrs,
4139 	.is_visible = iscsi_conn_attr_is_visible,
4140 };
4141 
4142 /*
4143  * iSCSI session attrs
4144  */
4145 #define iscsi_session_attr_show(param, perm)				\
4146 static ssize_t								\
4147 show_session_param_##param(struct device *dev,				\
4148 			   struct device_attribute *attr, char *buf)	\
4149 {									\
4150 	struct iscsi_cls_session *session = 				\
4151 		iscsi_dev_to_session(dev->parent);			\
4152 	struct iscsi_transport *t = session->transport;			\
4153 									\
4154 	if (perm && !capable(CAP_SYS_ADMIN))				\
4155 		return -EACCES;						\
4156 	return t->get_session_param(session, param, buf);		\
4157 }
4158 
4159 #define iscsi_session_attr(field, param, perm)				\
4160 	iscsi_session_attr_show(param, perm)				\
4161 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4162 			NULL);
4163 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4164 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4165 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4166 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4167 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4168 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4169 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4170 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4171 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4172 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4173 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4174 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4175 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4176 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4177 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4178 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4179 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4180 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4181 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4182 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4183 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4184 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4185 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4186 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4187 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4188 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4189 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4190 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4191 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4192 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4193 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4194 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4195 iscsi_session_attr(discovery_auth_optional,
4196 		   ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4197 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4198 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4199 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4200 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4201 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4202 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4203 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4204 
4205 static ssize_t
4206 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4207 			char *buf)
4208 {
4209 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4210 	return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4211 }
4212 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4213 			NULL);
4214 static ssize_t
4215 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4216 			char *buf)
4217 {
4218 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4219 	return sysfs_emit(buf, "%d\n", session->creator);
4220 }
4221 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4222 			NULL);
4223 static ssize_t
4224 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4225 			    char *buf)
4226 {
4227 	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4228 	return sysfs_emit(buf, "%d\n", session->target_id);
4229 }
4230 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4231 			show_priv_session_target_id, NULL);
4232 
4233 #define iscsi_priv_session_attr_show(field, format)			\
4234 static ssize_t								\
4235 show_priv_session_##field(struct device *dev, 				\
4236 			  struct device_attribute *attr, char *buf)	\
4237 {									\
4238 	struct iscsi_cls_session *session = 				\
4239 			iscsi_dev_to_session(dev->parent);		\
4240 	if (session->field == -1)					\
4241 		return sysfs_emit(buf, "off\n");			\
4242 	return sysfs_emit(buf, format"\n", session->field);		\
4243 }
4244 
4245 #define iscsi_priv_session_attr_store(field)				\
4246 static ssize_t								\
4247 store_priv_session_##field(struct device *dev,				\
4248 			   struct device_attribute *attr,		\
4249 			   const char *buf, size_t count)		\
4250 {									\
4251 	int val;							\
4252 	char *cp;							\
4253 	struct iscsi_cls_session *session =				\
4254 		iscsi_dev_to_session(dev->parent);			\
4255 	if ((session->state == ISCSI_SESSION_FREE) ||			\
4256 	    (session->state == ISCSI_SESSION_FAILED))			\
4257 		return -EBUSY;						\
4258 	if (strncmp(buf, "off", 3) == 0) {				\
4259 		session->field = -1;					\
4260 		session->field##_sysfs_override = true;			\
4261 	} else {							\
4262 		val = simple_strtoul(buf, &cp, 0);			\
4263 		if (*cp != '\0' && *cp != '\n')				\
4264 			return -EINVAL;					\
4265 		session->field = val;					\
4266 		session->field##_sysfs_override = true;			\
4267 	}								\
4268 	return count;							\
4269 }
4270 
4271 #define iscsi_priv_session_rw_attr(field, format)			\
4272 	iscsi_priv_session_attr_show(field, format)			\
4273 	iscsi_priv_session_attr_store(field)				\
4274 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,		\
4275 			show_priv_session_##field,			\
4276 			store_priv_session_##field)
4277 
4278 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4279 
4280 static struct attribute *iscsi_session_attrs[] = {
4281 	&dev_attr_sess_initial_r2t.attr,
4282 	&dev_attr_sess_max_outstanding_r2t.attr,
4283 	&dev_attr_sess_immediate_data.attr,
4284 	&dev_attr_sess_first_burst_len.attr,
4285 	&dev_attr_sess_max_burst_len.attr,
4286 	&dev_attr_sess_data_pdu_in_order.attr,
4287 	&dev_attr_sess_data_seq_in_order.attr,
4288 	&dev_attr_sess_erl.attr,
4289 	&dev_attr_sess_targetname.attr,
4290 	&dev_attr_sess_tpgt.attr,
4291 	&dev_attr_sess_password.attr,
4292 	&dev_attr_sess_password_in.attr,
4293 	&dev_attr_sess_username.attr,
4294 	&dev_attr_sess_username_in.attr,
4295 	&dev_attr_sess_fast_abort.attr,
4296 	&dev_attr_sess_abort_tmo.attr,
4297 	&dev_attr_sess_lu_reset_tmo.attr,
4298 	&dev_attr_sess_tgt_reset_tmo.attr,
4299 	&dev_attr_sess_ifacename.attr,
4300 	&dev_attr_sess_initiatorname.attr,
4301 	&dev_attr_sess_targetalias.attr,
4302 	&dev_attr_sess_boot_root.attr,
4303 	&dev_attr_sess_boot_nic.attr,
4304 	&dev_attr_sess_boot_target.attr,
4305 	&dev_attr_priv_sess_recovery_tmo.attr,
4306 	&dev_attr_priv_sess_state.attr,
4307 	&dev_attr_priv_sess_creator.attr,
4308 	&dev_attr_sess_chap_out_idx.attr,
4309 	&dev_attr_sess_chap_in_idx.attr,
4310 	&dev_attr_priv_sess_target_id.attr,
4311 	&dev_attr_sess_auto_snd_tgt_disable.attr,
4312 	&dev_attr_sess_discovery_session.attr,
4313 	&dev_attr_sess_portal_type.attr,
4314 	&dev_attr_sess_chap_auth.attr,
4315 	&dev_attr_sess_discovery_logout.attr,
4316 	&dev_attr_sess_bidi_chap.attr,
4317 	&dev_attr_sess_discovery_auth_optional.attr,
4318 	&dev_attr_sess_def_time2wait.attr,
4319 	&dev_attr_sess_def_time2retain.attr,
4320 	&dev_attr_sess_isid.attr,
4321 	&dev_attr_sess_tsid.attr,
4322 	&dev_attr_sess_def_taskmgmt_tmo.attr,
4323 	&dev_attr_sess_discovery_parent_idx.attr,
4324 	&dev_attr_sess_discovery_parent_type.attr,
4325 	NULL,
4326 };
4327 
4328 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4329 					    struct attribute *attr, int i)
4330 {
4331 	struct device *cdev = container_of(kobj, struct device, kobj);
4332 	struct iscsi_cls_session *session = transport_class_to_session(cdev);
4333 	struct iscsi_transport *t = session->transport;
4334 	int param;
4335 
4336 	if (attr == &dev_attr_sess_initial_r2t.attr)
4337 		param = ISCSI_PARAM_INITIAL_R2T_EN;
4338 	else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4339 		param = ISCSI_PARAM_MAX_R2T;
4340 	else if (attr == &dev_attr_sess_immediate_data.attr)
4341 		param = ISCSI_PARAM_IMM_DATA_EN;
4342 	else if (attr == &dev_attr_sess_first_burst_len.attr)
4343 		param = ISCSI_PARAM_FIRST_BURST;
4344 	else if (attr == &dev_attr_sess_max_burst_len.attr)
4345 		param = ISCSI_PARAM_MAX_BURST;
4346 	else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4347 		param = ISCSI_PARAM_PDU_INORDER_EN;
4348 	else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4349 		param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4350 	else if (attr == &dev_attr_sess_erl.attr)
4351 		param = ISCSI_PARAM_ERL;
4352 	else if (attr == &dev_attr_sess_targetname.attr)
4353 		param = ISCSI_PARAM_TARGET_NAME;
4354 	else if (attr == &dev_attr_sess_tpgt.attr)
4355 		param = ISCSI_PARAM_TPGT;
4356 	else if (attr == &dev_attr_sess_chap_in_idx.attr)
4357 		param = ISCSI_PARAM_CHAP_IN_IDX;
4358 	else if (attr == &dev_attr_sess_chap_out_idx.attr)
4359 		param = ISCSI_PARAM_CHAP_OUT_IDX;
4360 	else if (attr == &dev_attr_sess_password.attr)
4361 		param = ISCSI_PARAM_USERNAME;
4362 	else if (attr == &dev_attr_sess_password_in.attr)
4363 		param = ISCSI_PARAM_USERNAME_IN;
4364 	else if (attr == &dev_attr_sess_username.attr)
4365 		param = ISCSI_PARAM_PASSWORD;
4366 	else if (attr == &dev_attr_sess_username_in.attr)
4367 		param = ISCSI_PARAM_PASSWORD_IN;
4368 	else if (attr == &dev_attr_sess_fast_abort.attr)
4369 		param = ISCSI_PARAM_FAST_ABORT;
4370 	else if (attr == &dev_attr_sess_abort_tmo.attr)
4371 		param = ISCSI_PARAM_ABORT_TMO;
4372 	else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4373 		param = ISCSI_PARAM_LU_RESET_TMO;
4374 	else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4375 		param = ISCSI_PARAM_TGT_RESET_TMO;
4376 	else if (attr == &dev_attr_sess_ifacename.attr)
4377 		param = ISCSI_PARAM_IFACE_NAME;
4378 	else if (attr == &dev_attr_sess_initiatorname.attr)
4379 		param = ISCSI_PARAM_INITIATOR_NAME;
4380 	else if (attr == &dev_attr_sess_targetalias.attr)
4381 		param = ISCSI_PARAM_TARGET_ALIAS;
4382 	else if (attr == &dev_attr_sess_boot_root.attr)
4383 		param = ISCSI_PARAM_BOOT_ROOT;
4384 	else if (attr == &dev_attr_sess_boot_nic.attr)
4385 		param = ISCSI_PARAM_BOOT_NIC;
4386 	else if (attr == &dev_attr_sess_boot_target.attr)
4387 		param = ISCSI_PARAM_BOOT_TARGET;
4388 	else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4389 		param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4390 	else if (attr == &dev_attr_sess_discovery_session.attr)
4391 		param = ISCSI_PARAM_DISCOVERY_SESS;
4392 	else if (attr == &dev_attr_sess_portal_type.attr)
4393 		param = ISCSI_PARAM_PORTAL_TYPE;
4394 	else if (attr == &dev_attr_sess_chap_auth.attr)
4395 		param = ISCSI_PARAM_CHAP_AUTH_EN;
4396 	else if (attr == &dev_attr_sess_discovery_logout.attr)
4397 		param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4398 	else if (attr == &dev_attr_sess_bidi_chap.attr)
4399 		param = ISCSI_PARAM_BIDI_CHAP_EN;
4400 	else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4401 		param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4402 	else if (attr == &dev_attr_sess_def_time2wait.attr)
4403 		param = ISCSI_PARAM_DEF_TIME2WAIT;
4404 	else if (attr == &dev_attr_sess_def_time2retain.attr)
4405 		param = ISCSI_PARAM_DEF_TIME2RETAIN;
4406 	else if (attr == &dev_attr_sess_isid.attr)
4407 		param = ISCSI_PARAM_ISID;
4408 	else if (attr == &dev_attr_sess_tsid.attr)
4409 		param = ISCSI_PARAM_TSID;
4410 	else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4411 		param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4412 	else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4413 		param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4414 	else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4415 		param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4416 	else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4417 		return S_IRUGO | S_IWUSR;
4418 	else if (attr == &dev_attr_priv_sess_state.attr)
4419 		return S_IRUGO;
4420 	else if (attr == &dev_attr_priv_sess_creator.attr)
4421 		return S_IRUGO;
4422 	else if (attr == &dev_attr_priv_sess_target_id.attr)
4423 		return S_IRUGO;
4424 	else {
4425 		WARN_ONCE(1, "Invalid session attr");
4426 		return 0;
4427 	}
4428 
4429 	return t->attr_is_visible(ISCSI_PARAM, param);
4430 }
4431 
4432 static struct attribute_group iscsi_session_group = {
4433 	.attrs = iscsi_session_attrs,
4434 	.is_visible = iscsi_session_attr_is_visible,
4435 };
4436 
4437 /*
4438  * iSCSI host attrs
4439  */
4440 #define iscsi_host_attr_show(param)					\
4441 static ssize_t								\
4442 show_host_param_##param(struct device *dev, 				\
4443 			struct device_attribute *attr, char *buf)	\
4444 {									\
4445 	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
4446 	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4447 	return priv->iscsi_transport->get_host_param(shost, param, buf); \
4448 }
4449 
4450 #define iscsi_host_attr(field, param)					\
4451 	iscsi_host_attr_show(param)					\
4452 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,	\
4453 			NULL);
4454 
4455 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4456 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4457 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4458 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4459 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4460 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4461 
4462 static struct attribute *iscsi_host_attrs[] = {
4463 	&dev_attr_host_netdev.attr,
4464 	&dev_attr_host_hwaddress.attr,
4465 	&dev_attr_host_ipaddress.attr,
4466 	&dev_attr_host_initiatorname.attr,
4467 	&dev_attr_host_port_state.attr,
4468 	&dev_attr_host_port_speed.attr,
4469 	NULL,
4470 };
4471 
4472 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4473 					 struct attribute *attr, int i)
4474 {
4475 	struct device *cdev = container_of(kobj, struct device, kobj);
4476 	struct Scsi_Host *shost = transport_class_to_shost(cdev);
4477 	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4478 	int param;
4479 
4480 	if (attr == &dev_attr_host_netdev.attr)
4481 		param = ISCSI_HOST_PARAM_NETDEV_NAME;
4482 	else if (attr == &dev_attr_host_hwaddress.attr)
4483 		param = ISCSI_HOST_PARAM_HWADDRESS;
4484 	else if (attr == &dev_attr_host_ipaddress.attr)
4485 		param = ISCSI_HOST_PARAM_IPADDRESS;
4486 	else if (attr == &dev_attr_host_initiatorname.attr)
4487 		param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4488 	else if (attr == &dev_attr_host_port_state.attr)
4489 		param = ISCSI_HOST_PARAM_PORT_STATE;
4490 	else if (attr == &dev_attr_host_port_speed.attr)
4491 		param = ISCSI_HOST_PARAM_PORT_SPEED;
4492 	else {
4493 		WARN_ONCE(1, "Invalid host attr");
4494 		return 0;
4495 	}
4496 
4497 	return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4498 }
4499 
4500 static struct attribute_group iscsi_host_group = {
4501 	.attrs = iscsi_host_attrs,
4502 	.is_visible = iscsi_host_attr_is_visible,
4503 };
4504 
4505 /* convert iscsi_port_speed values to ascii string name */
4506 static const struct {
4507 	enum iscsi_port_speed	value;
4508 	char			*name;
4509 } iscsi_port_speed_names[] = {
4510 	{ISCSI_PORT_SPEED_UNKNOWN,	"Unknown" },
4511 	{ISCSI_PORT_SPEED_10MBPS,	"10 Mbps" },
4512 	{ISCSI_PORT_SPEED_100MBPS,	"100 Mbps" },
4513 	{ISCSI_PORT_SPEED_1GBPS,	"1 Gbps" },
4514 	{ISCSI_PORT_SPEED_10GBPS,	"10 Gbps" },
4515 	{ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4516 	{ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4517 };
4518 
4519 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4520 {
4521 	int i;
4522 	char *speed = "Unknown!";
4523 	struct iscsi_cls_host *ihost = shost->shost_data;
4524 	uint32_t port_speed = ihost->port_speed;
4525 
4526 	for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4527 		if (iscsi_port_speed_names[i].value & port_speed) {
4528 			speed = iscsi_port_speed_names[i].name;
4529 			break;
4530 		}
4531 	}
4532 	return speed;
4533 }
4534 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4535 
4536 /* convert iscsi_port_state values to ascii string name */
4537 static const struct {
4538 	enum iscsi_port_state	value;
4539 	char			*name;
4540 } iscsi_port_state_names[] = {
4541 	{ISCSI_PORT_STATE_DOWN,		"LINK DOWN" },
4542 	{ISCSI_PORT_STATE_UP,		"LINK UP" },
4543 };
4544 
4545 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4546 {
4547 	int i;
4548 	char *state = "Unknown!";
4549 	struct iscsi_cls_host *ihost = shost->shost_data;
4550 	uint32_t port_state = ihost->port_state;
4551 
4552 	for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4553 		if (iscsi_port_state_names[i].value & port_state) {
4554 			state = iscsi_port_state_names[i].name;
4555 			break;
4556 		}
4557 	}
4558 	return state;
4559 }
4560 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4561 
4562 static int iscsi_session_match(struct attribute_container *cont,
4563 			   struct device *dev)
4564 {
4565 	struct iscsi_cls_session *session;
4566 	struct Scsi_Host *shost;
4567 	struct iscsi_internal *priv;
4568 
4569 	if (!iscsi_is_session_dev(dev))
4570 		return 0;
4571 
4572 	session = iscsi_dev_to_session(dev);
4573 	shost = iscsi_session_to_shost(session);
4574 	if (!shost->transportt)
4575 		return 0;
4576 
4577 	priv = to_iscsi_internal(shost->transportt);
4578 	if (priv->session_cont.ac.class != &iscsi_session_class.class)
4579 		return 0;
4580 
4581 	return &priv->session_cont.ac == cont;
4582 }
4583 
4584 static int iscsi_conn_match(struct attribute_container *cont,
4585 			   struct device *dev)
4586 {
4587 	struct iscsi_cls_session *session;
4588 	struct iscsi_cls_conn *conn;
4589 	struct Scsi_Host *shost;
4590 	struct iscsi_internal *priv;
4591 
4592 	if (!iscsi_is_conn_dev(dev))
4593 		return 0;
4594 
4595 	conn = iscsi_dev_to_conn(dev);
4596 	session = iscsi_dev_to_session(conn->dev.parent);
4597 	shost = iscsi_session_to_shost(session);
4598 
4599 	if (!shost->transportt)
4600 		return 0;
4601 
4602 	priv = to_iscsi_internal(shost->transportt);
4603 	if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4604 		return 0;
4605 
4606 	return &priv->conn_cont.ac == cont;
4607 }
4608 
4609 static int iscsi_host_match(struct attribute_container *cont,
4610 			    struct device *dev)
4611 {
4612 	struct Scsi_Host *shost;
4613 	struct iscsi_internal *priv;
4614 
4615 	if (!scsi_is_host_device(dev))
4616 		return 0;
4617 
4618 	shost = dev_to_shost(dev);
4619 	if (!shost->transportt  ||
4620 	    shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4621 		return 0;
4622 
4623         priv = to_iscsi_internal(shost->transportt);
4624         return &priv->t.host_attrs.ac == cont;
4625 }
4626 
4627 struct scsi_transport_template *
4628 iscsi_register_transport(struct iscsi_transport *tt)
4629 {
4630 	struct iscsi_internal *priv;
4631 	unsigned long flags;
4632 	int err;
4633 
4634 	BUG_ON(!tt);
4635 
4636 	priv = iscsi_if_transport_lookup(tt);
4637 	if (priv)
4638 		return NULL;
4639 
4640 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4641 	if (!priv)
4642 		return NULL;
4643 	INIT_LIST_HEAD(&priv->list);
4644 	priv->iscsi_transport = tt;
4645 	priv->t.user_scan = iscsi_user_scan;
4646 	priv->t.create_work_queue = 1;
4647 
4648 	priv->dev.class = &iscsi_transport_class;
4649 	dev_set_name(&priv->dev, "%s", tt->name);
4650 	err = device_register(&priv->dev);
4651 	if (err)
4652 		goto free_priv;
4653 
4654 	err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4655 	if (err)
4656 		goto unregister_dev;
4657 
4658 	/* host parameters */
4659 	priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4660 	priv->t.host_attrs.ac.match = iscsi_host_match;
4661 	priv->t.host_attrs.ac.grp = &iscsi_host_group;
4662 	priv->t.host_size = sizeof(struct iscsi_cls_host);
4663 	transport_container_register(&priv->t.host_attrs);
4664 
4665 	/* connection parameters */
4666 	priv->conn_cont.ac.class = &iscsi_connection_class.class;
4667 	priv->conn_cont.ac.match = iscsi_conn_match;
4668 	priv->conn_cont.ac.grp = &iscsi_conn_group;
4669 	transport_container_register(&priv->conn_cont);
4670 
4671 	/* session parameters */
4672 	priv->session_cont.ac.class = &iscsi_session_class.class;
4673 	priv->session_cont.ac.match = iscsi_session_match;
4674 	priv->session_cont.ac.grp = &iscsi_session_group;
4675 	transport_container_register(&priv->session_cont);
4676 
4677 	spin_lock_irqsave(&iscsi_transport_lock, flags);
4678 	list_add(&priv->list, &iscsi_transports);
4679 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4680 
4681 	printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4682 	return &priv->t;
4683 
4684 unregister_dev:
4685 	device_unregister(&priv->dev);
4686 	return NULL;
4687 free_priv:
4688 	kfree(priv);
4689 	return NULL;
4690 }
4691 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4692 
4693 int iscsi_unregister_transport(struct iscsi_transport *tt)
4694 {
4695 	struct iscsi_internal *priv;
4696 	unsigned long flags;
4697 
4698 	BUG_ON(!tt);
4699 
4700 	mutex_lock(&rx_queue_mutex);
4701 
4702 	priv = iscsi_if_transport_lookup(tt);
4703 	BUG_ON (!priv);
4704 
4705 	spin_lock_irqsave(&iscsi_transport_lock, flags);
4706 	list_del(&priv->list);
4707 	spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4708 
4709 	transport_container_unregister(&priv->conn_cont);
4710 	transport_container_unregister(&priv->session_cont);
4711 	transport_container_unregister(&priv->t.host_attrs);
4712 
4713 	sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4714 	device_unregister(&priv->dev);
4715 	mutex_unlock(&rx_queue_mutex);
4716 
4717 	return 0;
4718 }
4719 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4720 
4721 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4722 		     struct device *dev, const char *fmt, ...)
4723 {
4724 	struct va_format vaf;
4725 	va_list args;
4726 
4727 	va_start(args, fmt);
4728 	vaf.fmt = fmt;
4729 	vaf.va = &args;
4730 	trace(dev, &vaf);
4731 	va_end(args);
4732 }
4733 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4734 
4735 static __init int iscsi_transport_init(void)
4736 {
4737 	int err;
4738 	struct netlink_kernel_cfg cfg = {
4739 		.groups	= 1,
4740 		.input	= iscsi_if_rx,
4741 	};
4742 	printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4743 		ISCSI_TRANSPORT_VERSION);
4744 
4745 	atomic_set(&iscsi_session_nr, 0);
4746 
4747 	err = class_register(&iscsi_transport_class);
4748 	if (err)
4749 		return err;
4750 
4751 	err = class_register(&iscsi_endpoint_class);
4752 	if (err)
4753 		goto unregister_transport_class;
4754 
4755 	err = class_register(&iscsi_iface_class);
4756 	if (err)
4757 		goto unregister_endpoint_class;
4758 
4759 	err = transport_class_register(&iscsi_host_class);
4760 	if (err)
4761 		goto unregister_iface_class;
4762 
4763 	err = transport_class_register(&iscsi_connection_class);
4764 	if (err)
4765 		goto unregister_host_class;
4766 
4767 	err = transport_class_register(&iscsi_session_class);
4768 	if (err)
4769 		goto unregister_conn_class;
4770 
4771 	err = bus_register(&iscsi_flashnode_bus);
4772 	if (err)
4773 		goto unregister_session_class;
4774 
4775 	nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4776 	if (!nls) {
4777 		err = -ENOBUFS;
4778 		goto unregister_flashnode_bus;
4779 	}
4780 
4781 	iscsi_eh_timer_workq = alloc_workqueue("%s",
4782 			WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
4783 			1, "iscsi_eh");
4784 	if (!iscsi_eh_timer_workq) {
4785 		err = -ENOMEM;
4786 		goto release_nls;
4787 	}
4788 
4789 	iscsi_destroy_workq = alloc_workqueue("%s",
4790 			WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
4791 			1, "iscsi_destroy");
4792 	if (!iscsi_destroy_workq) {
4793 		err = -ENOMEM;
4794 		goto destroy_wq;
4795 	}
4796 
4797 	return 0;
4798 
4799 destroy_wq:
4800 	destroy_workqueue(iscsi_eh_timer_workq);
4801 release_nls:
4802 	netlink_kernel_release(nls);
4803 unregister_flashnode_bus:
4804 	bus_unregister(&iscsi_flashnode_bus);
4805 unregister_session_class:
4806 	transport_class_unregister(&iscsi_session_class);
4807 unregister_conn_class:
4808 	transport_class_unregister(&iscsi_connection_class);
4809 unregister_host_class:
4810 	transport_class_unregister(&iscsi_host_class);
4811 unregister_iface_class:
4812 	class_unregister(&iscsi_iface_class);
4813 unregister_endpoint_class:
4814 	class_unregister(&iscsi_endpoint_class);
4815 unregister_transport_class:
4816 	class_unregister(&iscsi_transport_class);
4817 	return err;
4818 }
4819 
4820 static void __exit iscsi_transport_exit(void)
4821 {
4822 	destroy_workqueue(iscsi_destroy_workq);
4823 	destroy_workqueue(iscsi_eh_timer_workq);
4824 	netlink_kernel_release(nls);
4825 	bus_unregister(&iscsi_flashnode_bus);
4826 	transport_class_unregister(&iscsi_connection_class);
4827 	transport_class_unregister(&iscsi_session_class);
4828 	transport_class_unregister(&iscsi_host_class);
4829 	class_unregister(&iscsi_endpoint_class);
4830 	class_unregister(&iscsi_iface_class);
4831 	class_unregister(&iscsi_transport_class);
4832 }
4833 
4834 module_init(iscsi_transport_init);
4835 module_exit(iscsi_transport_exit);
4836 
4837 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4838 	      "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4839 	      "Alex Aizman <itn780@yahoo.com>");
4840 MODULE_DESCRIPTION("iSCSI Transport Interface");
4841 MODULE_LICENSE("GPL");
4842 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4843 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
4844