1	// SPDX-License-Identifier: GPL-2.0-or-later
2	/*
3	* iSCSI transport class definitions
4	*
5	* Copyright (C) IBM Corporation, 2004
6	* Copyright (C) Mike Christie, 2004 - 2005
7	* Copyright (C) Dmitry Yusupov, 2004 - 2005
8	* Copyright (C) Alex Aizman, 2004 - 2005
9	*/
10	#include <linux/module.h>
11	#include <linux/mutex.h>
12	#include <linux/slab.h>
13	#include <linux/bsg-lib.h>
14	#include <linux/idr.h>
15	#include <net/tcp.h>
16	#include <scsi/scsi.h>
17	#include <scsi/scsi_host.h>
18	#include <scsi/scsi_device.h>
19	#include <scsi/scsi_transport.h>
20	#include <scsi/scsi_transport_iscsi.h>
21	#include <scsi/iscsi_if.h>
22	#include <scsi/scsi_cmnd.h>
23	#include <scsi/scsi_bsg_iscsi.h>
24
25	#define ISCSI_TRANSPORT_VERSION "2.0-870"
26
27	#define ISCSI_SEND_MAX_ALLOWED 10
28
29	#define CREATE_TRACE_POINTS
30	#include <trace/events/iscsi.h>
31
32	/*
33	* Export tracepoint symbols to be used by other modules.
34	*/
35	EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
36	EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
37	EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
38	EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
39	EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
40
41	static int dbg_session;
42	module_param_named(debug_session, dbg_session, int,
43	S_IRUGO | S_IWUSR);
44	MODULE_PARM_DESC(debug_session,
45	"Turn on debugging for sessions in scsi_transport_iscsi "
46	"module. Set to 1 to turn on, and zero to turn off. Default "
47	"is off.");
48
49	static int dbg_conn;
50	module_param_named(debug_conn, dbg_conn, int,
51	S_IRUGO | S_IWUSR);
52	MODULE_PARM_DESC(debug_conn,
53	"Turn on debugging for connections in scsi_transport_iscsi "
54	"module. Set to 1 to turn on, and zero to turn off. Default "
55	"is off.");
56
57	#define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
58	do { \
59	if (dbg_session) \
60	iscsi_cls_session_printk(KERN_INFO, _session, \
61	"%s: " dbg_fmt, \
62	__func__, ##arg); \
63	iscsi_dbg_trace(trace_iscsi_dbg_trans_session, \
64	&(_session)->dev, \
65	"%s " dbg_fmt, __func__, ##arg); \
66	} while (0);
67
68	#define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
69	do { \
70	if (dbg_conn) \
71	iscsi_cls_conn_printk(KERN_INFO, _conn, \
72	"%s: " dbg_fmt, \
73	__func__, ##arg); \
74	iscsi_dbg_trace(trace_iscsi_dbg_trans_conn, \
75	&(_conn)->dev, \
76	"%s " dbg_fmt, __func__, ##arg); \
77	} while (0);
78
79	struct iscsi_internal {
80	struct scsi_transport_template t;
81	struct iscsi_transport *iscsi_transport;
82	struct list_head list;
83	struct device dev;
84
85	struct transport_container conn_cont;
86	struct transport_container session_cont;
87	};
88
89	static DEFINE_IDR(iscsi_ep_idr);
90	static DEFINE_MUTEX(iscsi_ep_idr_mutex);
91
92	static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
93
94	static struct workqueue_struct *iscsi_conn_cleanup_workq;
95
96	static DEFINE_IDA(iscsi_sess_ida);
97	/*
98	* list of registered transports and lock that must
99	* be held while accessing list. The iscsi_transport_lock must
100	* be acquired after the rx_queue_mutex.
101	*/
102	static LIST_HEAD(iscsi_transports);
103	static DEFINE_SPINLOCK(iscsi_transport_lock);
104
105	#define to_iscsi_internal(tmpl) \
106	container_of(tmpl, struct iscsi_internal, t)
107
108	#define dev_to_iscsi_internal(_dev) \
109	container_of(_dev, struct iscsi_internal, dev)
110
111	static void iscsi_transport_release(struct device *dev)
112	{
113	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
114	kfree(objp: priv);
115	}
116
117	/*
118	* iscsi_transport_class represents the iscsi_transports that are
119	* registered.
120	*/
121	static struct class iscsi_transport_class = {
122	.name = "iscsi_transport",
123	.dev_release = iscsi_transport_release,
124	};
125
126	static ssize_t
127	show_transport_handle(struct device *dev, struct device_attribute *attr,
128	char *buf)
129	{
130	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
131
132	if (!capable(CAP_SYS_ADMIN))
133	return -EACCES;
134	return sysfs_emit(buf, fmt: "%llu\n",
135	(unsigned long long)iscsi_handle(priv->iscsi_transport));
136	}
137	static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
138
139	#define show_transport_attr(name, format) \
140	static ssize_t \
141	show_transport_##name(struct device *dev, \
142	struct device_attribute *attr,char *buf) \
143	{ \
144	struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
145	return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
146	} \
147	static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
148
149	show_transport_attr(caps, "0x%x");
150
151	static struct attribute *iscsi_transport_attrs[] = {
152	&dev_attr_handle.attr,
153	&dev_attr_caps.attr,
154	NULL,
155	};
156
157	static struct attribute_group iscsi_transport_group = {
158	.attrs = iscsi_transport_attrs,
159	};
160
161	/*
162	* iSCSI endpoint attrs
163	*/
164	#define iscsi_dev_to_endpoint(_dev) \
165	container_of(_dev, struct iscsi_endpoint, dev)
166
167	#define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
168	struct device_attribute dev_attr_##_prefix##_##_name = \
169	__ATTR(_name,_mode,_show,_store)
170
171	static void iscsi_endpoint_release(struct device *dev)
172	{
173	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
174
175	mutex_lock(&iscsi_ep_idr_mutex);
176	idr_remove(&iscsi_ep_idr, id: ep->id);
177	mutex_unlock(lock: &iscsi_ep_idr_mutex);
178
179	kfree(objp: ep);
180	}
181
182	static struct class iscsi_endpoint_class = {
183	.name = "iscsi_endpoint",
184	.dev_release = iscsi_endpoint_release,
185	};
186
187	static ssize_t
188	show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
189	{
190	struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
191	return sysfs_emit(buf, fmt: "%d\n", ep->id);
192	}
193	static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
194
195	static struct attribute *iscsi_endpoint_attrs[] = {
196	&dev_attr_ep_handle.attr,
197	NULL,
198	};
199
200	static struct attribute_group iscsi_endpoint_group = {
201	.attrs = iscsi_endpoint_attrs,
202	};
203
204	struct iscsi_endpoint *
205	iscsi_create_endpoint(int dd_size)
206	{
207	struct iscsi_endpoint *ep;
208	int err, id;
209
210	ep = kzalloc(size: sizeof(*ep) + dd_size, GFP_KERNEL);
211	if (!ep)
212	return NULL;
213
214	mutex_lock(&iscsi_ep_idr_mutex);
215
216	/*
217	* First endpoint id should be 1 to comply with user space
218	* applications (iscsid).
219	*/
220	id = idr_alloc(&iscsi_ep_idr, ptr: ep, start: 1, end: -1, GFP_NOIO);
221	if (id < 0) {
222	mutex_unlock(lock: &iscsi_ep_idr_mutex);
223	printk(KERN_ERR "Could not allocate endpoint ID. Error %d.\n",
224	id);
225	goto free_ep;
226	}
227	mutex_unlock(lock: &iscsi_ep_idr_mutex);
228
229	ep->id = id;
230	ep->dev.class = &iscsi_endpoint_class;
231	dev_set_name(dev: &ep->dev, name: "ep-%d", id);
232	err = device_register(dev: &ep->dev);
233	if (err)
234	goto put_dev;
235
236	err = sysfs_create_group(kobj: &ep->dev.kobj, grp: &iscsi_endpoint_group);
237	if (err)
238	goto unregister_dev;
239
240	if (dd_size)
241	ep->dd_data = &ep[1];
242	return ep;
243
244	unregister_dev:
245	device_unregister(dev: &ep->dev);
246	return NULL;
247
248	put_dev:
249	mutex_lock(&iscsi_ep_idr_mutex);
250	idr_remove(&iscsi_ep_idr, id);
251	mutex_unlock(lock: &iscsi_ep_idr_mutex);
252	put_device(dev: &ep->dev);
253	return NULL;
254	free_ep:
255	kfree(objp: ep);
256	return NULL;
257	}
258	EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
259
260	void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
261	{
262	sysfs_remove_group(kobj: &ep->dev.kobj, grp: &iscsi_endpoint_group);
263	device_unregister(dev: &ep->dev);
264	}
265	EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
266
267	void iscsi_put_endpoint(struct iscsi_endpoint *ep)
268	{
269	put_device(dev: &ep->dev);
270	}
271	EXPORT_SYMBOL_GPL(iscsi_put_endpoint);
272
273	/**
274	* iscsi_lookup_endpoint - get ep from handle
275	* @handle: endpoint handle
276	*
277	* Caller must do a iscsi_put_endpoint.
278	*/
279	struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
280	{
281	struct iscsi_endpoint *ep;
282
283	mutex_lock(&iscsi_ep_idr_mutex);
284	ep = idr_find(&iscsi_ep_idr, id: handle);
285	if (!ep)
286	goto unlock;
287
288	get_device(dev: &ep->dev);
289	unlock:
290	mutex_unlock(lock: &iscsi_ep_idr_mutex);
291	return ep;
292	}
293	EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
294
295	/*
296	* Interface to display network param to sysfs
297	*/
298
299	static void iscsi_iface_release(struct device *dev)
300	{
301	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
302	struct device *parent = iface->dev.parent;
303
304	kfree(objp: iface);
305	put_device(dev: parent);
306	}
307
308
309	static struct class iscsi_iface_class = {
310	.name = "iscsi_iface",
311	.dev_release = iscsi_iface_release,
312	};
313
314	#define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store) \
315	struct device_attribute dev_attr_##_prefix##_##_name = \
316	__ATTR(_name, _mode, _show, _store)
317
318	/* iface attrs show */
319	#define iscsi_iface_attr_show(type, name, param_type, param) \
320	static ssize_t \
321	show_##type##_##name(struct device *dev, struct device_attribute *attr, \
322	char *buf) \
323	{ \
324	struct iscsi_iface *iface = iscsi_dev_to_iface(dev); \
325	struct iscsi_transport *t = iface->transport; \
326	return t->get_iface_param(iface, param_type, param, buf); \
327	} \
328
329	#define iscsi_iface_net_attr(type, name, param) \
330	iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param) \
331	static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
332
333	#define iscsi_iface_attr(type, name, param) \
334	iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param) \
335	static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
336
337	/* generic read only ipv4 attribute */
338	iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
339	iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
340	iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
341	iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
342	iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
343	ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
344	iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
345	ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
346	iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
347	iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
348	iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
349	ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
350	iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
351	ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
352	iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
353	ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
354	iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
355	ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
356	iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
357	ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
358	iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
359	ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
360	iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
361	ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
362	iscsi_iface_net_attr(ipv4_iface, fragment_disable,
363	ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
364	iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
365	ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
366	iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
367
368	/* generic read only ipv6 attribute */
369	iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
370	iscsi_iface_net_attr(ipv6_iface, link_local_addr,
371	ISCSI_NET_PARAM_IPV6_LINKLOCAL);
372	iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
373	iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
374	ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
375	iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
376	ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
377	iscsi_iface_net_attr(ipv6_iface, link_local_state,
378	ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
379	iscsi_iface_net_attr(ipv6_iface, router_state,
380	ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
381	iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
382	ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
383	iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
384	iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
385	iscsi_iface_net_attr(ipv6_iface, traffic_class,
386	ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
387	iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
388	iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
389	ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
390	iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
391	ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
392	iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
393	ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
394	iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
395	ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
396	iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
397	ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
398
399	/* common read only iface attribute */
400	iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
401	iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
402	iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
403	iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
404	iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
405	iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
406	iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
407	iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
408	iscsi_iface_net_attr(iface, tcp_nagle_disable,
409	ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
410	iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
411	iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
412	iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
413	iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
414	iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
415	iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
416
417	/* common iscsi specific settings attributes */
418	iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
419	iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
420	iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
421	iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
422	iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
423	iscsi_iface_attr(iface, data_seq_in_order,
424	ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
425	iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
426	iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
427	iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
428	iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
429	iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
430	iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
431	iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
432	iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
433	iscsi_iface_attr(iface, discovery_auth_optional,
434	ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
435	iscsi_iface_attr(iface, discovery_logout,
436	ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
437	iscsi_iface_attr(iface, strict_login_comp_en,
438	ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
439	iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
440
441	static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
442	struct attribute *attr, int i)
443	{
444	struct device *dev = container_of(kobj, struct device, kobj);
445	struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
446	struct iscsi_transport *t = iface->transport;
447	int param = -1;
448
449	if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
450	param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
451	else if (attr == &dev_attr_iface_header_digest.attr)
452	param = ISCSI_IFACE_PARAM_HDRDGST_EN;
453	else if (attr == &dev_attr_iface_data_digest.attr)
454	param = ISCSI_IFACE_PARAM_DATADGST_EN;
455	else if (attr == &dev_attr_iface_immediate_data.attr)
456	param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
457	else if (attr == &dev_attr_iface_initial_r2t.attr)
458	param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
459	else if (attr == &dev_attr_iface_data_seq_in_order.attr)
460	param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
461	else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
462	param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
463	else if (attr == &dev_attr_iface_erl.attr)
464	param = ISCSI_IFACE_PARAM_ERL;
465	else if (attr == &dev_attr_iface_max_recv_dlength.attr)
466	param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
467	else if (attr == &dev_attr_iface_first_burst_len.attr)
468	param = ISCSI_IFACE_PARAM_FIRST_BURST;
469	else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
470	param = ISCSI_IFACE_PARAM_MAX_R2T;
471	else if (attr == &dev_attr_iface_max_burst_len.attr)
472	param = ISCSI_IFACE_PARAM_MAX_BURST;
473	else if (attr == &dev_attr_iface_chap_auth.attr)
474	param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
475	else if (attr == &dev_attr_iface_bidi_chap.attr)
476	param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
477	else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
478	param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
479	else if (attr == &dev_attr_iface_discovery_logout.attr)
480	param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
481	else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
482	param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
483	else if (attr == &dev_attr_iface_initiator_name.attr)
484	param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
485
486	if (param != -1)
487	return t->attr_is_visible(ISCSI_IFACE_PARAM, param);
488
489	if (attr == &dev_attr_iface_enabled.attr)
490	param = ISCSI_NET_PARAM_IFACE_ENABLE;
491	else if (attr == &dev_attr_iface_vlan_id.attr)
492	param = ISCSI_NET_PARAM_VLAN_ID;
493	else if (attr == &dev_attr_iface_vlan_priority.attr)
494	param = ISCSI_NET_PARAM_VLAN_PRIORITY;
495	else if (attr == &dev_attr_iface_vlan_enabled.attr)
496	param = ISCSI_NET_PARAM_VLAN_ENABLED;
497	else if (attr == &dev_attr_iface_mtu.attr)
498	param = ISCSI_NET_PARAM_MTU;
499	else if (attr == &dev_attr_iface_port.attr)
500	param = ISCSI_NET_PARAM_PORT;
501	else if (attr == &dev_attr_iface_ipaddress_state.attr)
502	param = ISCSI_NET_PARAM_IPADDR_STATE;
503	else if (attr == &dev_attr_iface_delayed_ack_en.attr)
504	param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
505	else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
506	param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
507	else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
508	param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
509	else if (attr == &dev_attr_iface_tcp_wsf.attr)
510	param = ISCSI_NET_PARAM_TCP_WSF;
511	else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
512	param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
513	else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
514	param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
515	else if (attr == &dev_attr_iface_cache_id.attr)
516	param = ISCSI_NET_PARAM_CACHE_ID;
517	else if (attr == &dev_attr_iface_redirect_en.attr)
518	param = ISCSI_NET_PARAM_REDIRECT_EN;
519	else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
520	if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
521	param = ISCSI_NET_PARAM_IPV4_ADDR;
522	else if (attr == &dev_attr_ipv4_iface_gateway.attr)
523	param = ISCSI_NET_PARAM_IPV4_GW;
524	else if (attr == &dev_attr_ipv4_iface_subnet.attr)
525	param = ISCSI_NET_PARAM_IPV4_SUBNET;
526	else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
527	param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
528	else if (attr ==
529	&dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
530	param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
531	else if (attr ==
532	&dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
533	param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
534	else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
535	param = ISCSI_NET_PARAM_IPV4_TOS_EN;
536	else if (attr == &dev_attr_ipv4_iface_tos.attr)
537	param = ISCSI_NET_PARAM_IPV4_TOS;
538	else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
539	param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
540	else if (attr ==
541	&dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
542	param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
543	else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
544	param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
545	else if (attr ==
546	&dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
547	param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
548	else if (attr ==
549	&dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
550	param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
551	else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
552	param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
553	else if (attr ==
554	&dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
555	param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
556	else if (attr ==
557	&dev_attr_ipv4_iface_fragment_disable.attr)
558	param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
559	else if (attr ==
560	&dev_attr_ipv4_iface_incoming_forwarding_en.attr)
561	param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
562	else if (attr == &dev_attr_ipv4_iface_ttl.attr)
563	param = ISCSI_NET_PARAM_IPV4_TTL;
564	else
565	return 0;
566	} else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
567	if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
568	param = ISCSI_NET_PARAM_IPV6_ADDR;
569	else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
570	param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
571	else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
572	param = ISCSI_NET_PARAM_IPV6_ROUTER;
573	else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
574	param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
575	else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
576	param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
577	else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
578	param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
579	else if (attr == &dev_attr_ipv6_iface_router_state.attr)
580	param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
581	else if (attr ==
582	&dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
583	param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
584	else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
585	param = ISCSI_NET_PARAM_IPV6_MLD_EN;
586	else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
587	param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
588	else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
589	param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
590	else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
591	param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
592	else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
593	param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
594	else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
595	param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
596	else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
597	param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
598	else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
599	param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
600	else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
601	param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
602	else
603	return 0;
604	} else {
605	WARN_ONCE(1, "Invalid iface attr");
606	return 0;
607	}
608
609	return t->attr_is_visible(ISCSI_NET_PARAM, param);
610	}
611
612	static struct attribute *iscsi_iface_attrs[] = {
613	&dev_attr_iface_enabled.attr,
614	&dev_attr_iface_vlan_id.attr,
615	&dev_attr_iface_vlan_priority.attr,
616	&dev_attr_iface_vlan_enabled.attr,
617	&dev_attr_ipv4_iface_ipaddress.attr,
618	&dev_attr_ipv4_iface_gateway.attr,
619	&dev_attr_ipv4_iface_subnet.attr,
620	&dev_attr_ipv4_iface_bootproto.attr,
621	&dev_attr_ipv6_iface_ipaddress.attr,
622	&dev_attr_ipv6_iface_link_local_addr.attr,
623	&dev_attr_ipv6_iface_router_addr.attr,
624	&dev_attr_ipv6_iface_ipaddr_autocfg.attr,
625	&dev_attr_ipv6_iface_link_local_autocfg.attr,
626	&dev_attr_iface_mtu.attr,
627	&dev_attr_iface_port.attr,
628	&dev_attr_iface_ipaddress_state.attr,
629	&dev_attr_iface_delayed_ack_en.attr,
630	&dev_attr_iface_tcp_nagle_disable.attr,
631	&dev_attr_iface_tcp_wsf_disable.attr,
632	&dev_attr_iface_tcp_wsf.attr,
633	&dev_attr_iface_tcp_timer_scale.attr,
634	&dev_attr_iface_tcp_timestamp_en.attr,
635	&dev_attr_iface_cache_id.attr,
636	&dev_attr_iface_redirect_en.attr,
637	&dev_attr_iface_def_taskmgmt_tmo.attr,
638	&dev_attr_iface_header_digest.attr,
639	&dev_attr_iface_data_digest.attr,
640	&dev_attr_iface_immediate_data.attr,
641	&dev_attr_iface_initial_r2t.attr,
642	&dev_attr_iface_data_seq_in_order.attr,
643	&dev_attr_iface_data_pdu_in_order.attr,
644	&dev_attr_iface_erl.attr,
645	&dev_attr_iface_max_recv_dlength.attr,
646	&dev_attr_iface_first_burst_len.attr,
647	&dev_attr_iface_max_outstanding_r2t.attr,
648	&dev_attr_iface_max_burst_len.attr,
649	&dev_attr_iface_chap_auth.attr,
650	&dev_attr_iface_bidi_chap.attr,
651	&dev_attr_iface_discovery_auth_optional.attr,
652	&dev_attr_iface_discovery_logout.attr,
653	&dev_attr_iface_strict_login_comp_en.attr,
654	&dev_attr_iface_initiator_name.attr,
655	&dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
656	&dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
657	&dev_attr_ipv4_iface_tos_en.attr,
658	&dev_attr_ipv4_iface_tos.attr,
659	&dev_attr_ipv4_iface_grat_arp_en.attr,
660	&dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
661	&dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
662	&dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
663	&dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
664	&dev_attr_ipv4_iface_dhcp_vendor_id.attr,
665	&dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
666	&dev_attr_ipv4_iface_fragment_disable.attr,
667	&dev_attr_ipv4_iface_incoming_forwarding_en.attr,
668	&dev_attr_ipv4_iface_ttl.attr,
669	&dev_attr_ipv6_iface_link_local_state.attr,
670	&dev_attr_ipv6_iface_router_state.attr,
671	&dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
672	&dev_attr_ipv6_iface_mld_en.attr,
673	&dev_attr_ipv6_iface_flow_label.attr,
674	&dev_attr_ipv6_iface_traffic_class.attr,
675	&dev_attr_ipv6_iface_hop_limit.attr,
676	&dev_attr_ipv6_iface_nd_reachable_tmo.attr,
677	&dev_attr_ipv6_iface_nd_rexmit_time.attr,
678	&dev_attr_ipv6_iface_nd_stale_tmo.attr,
679	&dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
680	&dev_attr_ipv6_iface_router_adv_link_mtu.attr,
681	NULL,
682	};
683
684	static struct attribute_group iscsi_iface_group = {
685	.attrs = iscsi_iface_attrs,
686	.is_visible = iscsi_iface_attr_is_visible,
687	};
688
689	/* convert iscsi_ipaddress_state values to ascii string name */
690	static const struct {
691	enum iscsi_ipaddress_state value;
692	char *name;
693	} iscsi_ipaddress_state_names[] = {
694	{ISCSI_IPDDRESS_STATE_UNCONFIGURED, "Unconfigured" },
695	{ISCSI_IPDDRESS_STATE_ACQUIRING, "Acquiring" },
696	{ISCSI_IPDDRESS_STATE_TENTATIVE, "Tentative" },
697	{ISCSI_IPDDRESS_STATE_VALID, "Valid" },
698	{ISCSI_IPDDRESS_STATE_DISABLING, "Disabling" },
699	{ISCSI_IPDDRESS_STATE_INVALID, "Invalid" },
700	{ISCSI_IPDDRESS_STATE_DEPRECATED, "Deprecated" },
701	};
702
703	char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
704	{
705	int i;
706	char *state = NULL;
707
708	for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
709	if (iscsi_ipaddress_state_names[i].value == port_state) {
710	state = iscsi_ipaddress_state_names[i].name;
711	break;
712	}
713	}
714	return state;
715	}
716	EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
717
718	/* convert iscsi_router_state values to ascii string name */
719	static const struct {
720	enum iscsi_router_state value;
721	char *name;
722	} iscsi_router_state_names[] = {
723	{.value: ISCSI_ROUTER_STATE_UNKNOWN, .name: "Unknown" },
724	{ISCSI_ROUTER_STATE_ADVERTISED, "Advertised" },
725	{ISCSI_ROUTER_STATE_MANUAL, "Manual" },
726	{ISCSI_ROUTER_STATE_STALE, "Stale" },
727	};
728
729	char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
730	{
731	int i;
732	char *state = NULL;
733
734	for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
735	if (iscsi_router_state_names[i].value == router_state) {
736	state = iscsi_router_state_names[i].name;
737	break;
738	}
739	}
740	return state;
741	}
742	EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
743
744	struct iscsi_iface *
745	iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
746	uint32_t iface_type, uint32_t iface_num, int dd_size)
747	{
748	struct iscsi_iface *iface;
749	int err;
750
751	iface = kzalloc(size: sizeof(*iface) + dd_size, GFP_KERNEL);
752	if (!iface)
753	return NULL;
754
755	iface->transport = transport;
756	iface->iface_type = iface_type;
757	iface->iface_num = iface_num;
758	iface->dev.release = iscsi_iface_release;
759	iface->dev.class = &iscsi_iface_class;
760	/* parent reference released in iscsi_iface_release */
761	iface->dev.parent = get_device(dev: &shost->shost_gendev);
762	if (iface_type == ISCSI_IFACE_TYPE_IPV4)
763	dev_set_name(dev: &iface->dev, name: "ipv4-iface-%u-%u", shost->host_no,
764	iface_num);
765	else
766	dev_set_name(dev: &iface->dev, name: "ipv6-iface-%u-%u", shost->host_no,
767	iface_num);
768
769	err = device_register(dev: &iface->dev);
770	if (err)
771	goto put_dev;
772
773	err = sysfs_create_group(kobj: &iface->dev.kobj, grp: &iscsi_iface_group);
774	if (err)
775	goto unreg_iface;
776
777	if (dd_size)
778	iface->dd_data = &iface[1];
779	return iface;
780
781	unreg_iface:
782	device_unregister(dev: &iface->dev);
783	return NULL;
784
785	put_dev:
786	put_device(dev: &iface->dev);
787	return NULL;
788	}
789	EXPORT_SYMBOL_GPL(iscsi_create_iface);
790
791	void iscsi_destroy_iface(struct iscsi_iface *iface)
792	{
793	sysfs_remove_group(kobj: &iface->dev.kobj, grp: &iscsi_iface_group);
794	device_unregister(dev: &iface->dev);
795	}
796	EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
797
798	/*
799	* Interface to display flash node params to sysfs
800	*/
801
802	#define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store) \
803	struct device_attribute dev_attr_##_prefix##_##_name = \
804	__ATTR(_name, _mode, _show, _store)
805
806	/* flash node session attrs show */
807	#define iscsi_flashnode_sess_attr_show(type, name, param) \
808	static ssize_t \
809	show_##type##_##name(struct device *dev, struct device_attribute *attr, \
810	char *buf) \
811	{ \
812	struct iscsi_bus_flash_session *fnode_sess = \
813	iscsi_dev_to_flash_session(dev);\
814	struct iscsi_transport *t = fnode_sess->transport; \
815	return t->get_flashnode_param(fnode_sess, param, buf); \
816	} \
817
818
819	#define iscsi_flashnode_sess_attr(type, name, param) \
820	iscsi_flashnode_sess_attr_show(type, name, param) \
821	static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO, \
822	show_##type##_##name, NULL);
823
824	/* Flash node session attributes */
825
826	iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
827	ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
828	iscsi_flashnode_sess_attr(fnode, discovery_session,
829	ISCSI_FLASHNODE_DISCOVERY_SESS);
830	iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
831	iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
832	iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
833	iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
834	iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
835	ISCSI_FLASHNODE_DATASEQ_INORDER);
836	iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
837	ISCSI_FLASHNODE_PDU_INORDER);
838	iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
839	iscsi_flashnode_sess_attr(fnode, discovery_logout,
840	ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
841	iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
842	iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
843	ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
844	iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
845	iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
846	iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
847	iscsi_flashnode_sess_attr(fnode, def_time2retain,
848	ISCSI_FLASHNODE_DEF_TIME2RETAIN);
849	iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
850	iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
851	iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
852	iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
853	iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
854	ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
855	iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
856	iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
857	iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
858	iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
859	ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
860	iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
861	ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
862	iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
863	iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
864	iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
865	iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
866	iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
867	iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
868	iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
869
870	static struct attribute *iscsi_flashnode_sess_attrs[] = {
871	&dev_attr_fnode_auto_snd_tgt_disable.attr,
872	&dev_attr_fnode_discovery_session.attr,
873	&dev_attr_fnode_portal_type.attr,
874	&dev_attr_fnode_entry_enable.attr,
875	&dev_attr_fnode_immediate_data.attr,
876	&dev_attr_fnode_initial_r2t.attr,
877	&dev_attr_fnode_data_seq_in_order.attr,
878	&dev_attr_fnode_data_pdu_in_order.attr,
879	&dev_attr_fnode_chap_auth.attr,
880	&dev_attr_fnode_discovery_logout.attr,
881	&dev_attr_fnode_bidi_chap.attr,
882	&dev_attr_fnode_discovery_auth_optional.attr,
883	&dev_attr_fnode_erl.attr,
884	&dev_attr_fnode_first_burst_len.attr,
885	&dev_attr_fnode_def_time2wait.attr,
886	&dev_attr_fnode_def_time2retain.attr,
887	&dev_attr_fnode_max_outstanding_r2t.attr,
888	&dev_attr_fnode_isid.attr,
889	&dev_attr_fnode_tsid.attr,
890	&dev_attr_fnode_max_burst_len.attr,
891	&dev_attr_fnode_def_taskmgmt_tmo.attr,
892	&dev_attr_fnode_targetalias.attr,
893	&dev_attr_fnode_targetname.attr,
894	&dev_attr_fnode_tpgt.attr,
895	&dev_attr_fnode_discovery_parent_idx.attr,
896	&dev_attr_fnode_discovery_parent_type.attr,
897	&dev_attr_fnode_chap_in_idx.attr,
898	&dev_attr_fnode_chap_out_idx.attr,
899	&dev_attr_fnode_username.attr,
900	&dev_attr_fnode_username_in.attr,
901	&dev_attr_fnode_password.attr,
902	&dev_attr_fnode_password_in.attr,
903	&dev_attr_fnode_is_boot_target.attr,
904	NULL,
905	};
906
907	static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
908	struct attribute *attr,
909	int i)
910	{
911	struct device *dev = container_of(kobj, struct device, kobj);
912	struct iscsi_bus_flash_session *fnode_sess =
913	iscsi_dev_to_flash_session(dev);
914	struct iscsi_transport *t = fnode_sess->transport;
915	int param;
916
917	if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
918	param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
919	} else if (attr == &dev_attr_fnode_discovery_session.attr) {
920	param = ISCSI_FLASHNODE_DISCOVERY_SESS;
921	} else if (attr == &dev_attr_fnode_portal_type.attr) {
922	param = ISCSI_FLASHNODE_PORTAL_TYPE;
923	} else if (attr == &dev_attr_fnode_entry_enable.attr) {
924	param = ISCSI_FLASHNODE_ENTRY_EN;
925	} else if (attr == &dev_attr_fnode_immediate_data.attr) {
926	param = ISCSI_FLASHNODE_IMM_DATA_EN;
927	} else if (attr == &dev_attr_fnode_initial_r2t.attr) {
928	param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
929	} else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
930	param = ISCSI_FLASHNODE_DATASEQ_INORDER;
931	} else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
932	param = ISCSI_FLASHNODE_PDU_INORDER;
933	} else if (attr == &dev_attr_fnode_chap_auth.attr) {
934	param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
935	} else if (attr == &dev_attr_fnode_discovery_logout.attr) {
936	param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
937	} else if (attr == &dev_attr_fnode_bidi_chap.attr) {
938	param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
939	} else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
940	param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
941	} else if (attr == &dev_attr_fnode_erl.attr) {
942	param = ISCSI_FLASHNODE_ERL;
943	} else if (attr == &dev_attr_fnode_first_burst_len.attr) {
944	param = ISCSI_FLASHNODE_FIRST_BURST;
945	} else if (attr == &dev_attr_fnode_def_time2wait.attr) {
946	param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
947	} else if (attr == &dev_attr_fnode_def_time2retain.attr) {
948	param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
949	} else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
950	param = ISCSI_FLASHNODE_MAX_R2T;
951	} else if (attr == &dev_attr_fnode_isid.attr) {
952	param = ISCSI_FLASHNODE_ISID;
953	} else if (attr == &dev_attr_fnode_tsid.attr) {
954	param = ISCSI_FLASHNODE_TSID;
955	} else if (attr == &dev_attr_fnode_max_burst_len.attr) {
956	param = ISCSI_FLASHNODE_MAX_BURST;
957	} else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
958	param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
959	} else if (attr == &dev_attr_fnode_targetalias.attr) {
960	param = ISCSI_FLASHNODE_ALIAS;
961	} else if (attr == &dev_attr_fnode_targetname.attr) {
962	param = ISCSI_FLASHNODE_NAME;
963	} else if (attr == &dev_attr_fnode_tpgt.attr) {
964	param = ISCSI_FLASHNODE_TPGT;
965	} else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
966	param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
967	} else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
968	param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
969	} else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
970	param = ISCSI_FLASHNODE_CHAP_IN_IDX;
971	} else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
972	param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
973	} else if (attr == &dev_attr_fnode_username.attr) {
974	param = ISCSI_FLASHNODE_USERNAME;
975	} else if (attr == &dev_attr_fnode_username_in.attr) {
976	param = ISCSI_FLASHNODE_USERNAME_IN;
977	} else if (attr == &dev_attr_fnode_password.attr) {
978	param = ISCSI_FLASHNODE_PASSWORD;
979	} else if (attr == &dev_attr_fnode_password_in.attr) {
980	param = ISCSI_FLASHNODE_PASSWORD_IN;
981	} else if (attr == &dev_attr_fnode_is_boot_target.attr) {
982	param = ISCSI_FLASHNODE_IS_BOOT_TGT;
983	} else {
984	WARN_ONCE(1, "Invalid flashnode session attr");
985	return 0;
986	}
987
988	return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
989	}
990
991	static struct attribute_group iscsi_flashnode_sess_attr_group = {
992	.attrs = iscsi_flashnode_sess_attrs,
993	.is_visible = iscsi_flashnode_sess_attr_is_visible,
994	};
995
996	static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
997	&iscsi_flashnode_sess_attr_group,
998	NULL,
999	};
1000
1001	static void iscsi_flashnode_sess_release(struct device *dev)
1002	{
1003	struct iscsi_bus_flash_session *fnode_sess =
1004	iscsi_dev_to_flash_session(dev);
1005
1006	kfree(objp: fnode_sess->targetname);
1007	kfree(objp: fnode_sess->targetalias);
1008	kfree(objp: fnode_sess->portal_type);
1009	kfree(objp: fnode_sess);
1010	}
1011
1012	static const struct device_type iscsi_flashnode_sess_dev_type = {
1013	.name = "iscsi_flashnode_sess_dev_type",
1014	.groups = iscsi_flashnode_sess_attr_groups,
1015	.release = iscsi_flashnode_sess_release,
1016	};
1017
1018	/* flash node connection attrs show */
1019	#define iscsi_flashnode_conn_attr_show(type, name, param) \
1020	static ssize_t \
1021	show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1022	char *buf) \
1023	{ \
1024	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1025	struct iscsi_bus_flash_session *fnode_sess = \
1026	iscsi_flash_conn_to_flash_session(fnode_conn);\
1027	struct iscsi_transport *t = fnode_conn->transport; \
1028	return t->get_flashnode_param(fnode_sess, param, buf); \
1029	} \
1030
1031
1032	#define iscsi_flashnode_conn_attr(type, name, param) \
1033	iscsi_flashnode_conn_attr_show(type, name, param) \
1034	static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO, \
1035	show_##type##_##name, NULL);
1036
1037	/* Flash node connection attributes */
1038
1039	iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1040	ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1041	iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1042	iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1043	iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1044	iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1045	ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1046	iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1047	ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1048	iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1049	ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1050	iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1051	ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1052	iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1053	ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1054	iscsi_flashnode_conn_attr(fnode, fragment_disable,
1055	ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1056	iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1057	iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1058	iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1059	iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1060	ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1061	iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1062	ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1063	iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1064	iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1065	iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1066	iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1067	ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1068	iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1069	ISCSI_FLASHNODE_REDIRECT_IPADDR);
1070	iscsi_flashnode_conn_attr(fnode, max_segment_size,
1071	ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1072	iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1073	ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1074	iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1075	iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1076	iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1077	iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1078
1079	static struct attribute *iscsi_flashnode_conn_attrs[] = {
1080	&dev_attr_fnode_is_fw_assigned_ipv6.attr,
1081	&dev_attr_fnode_header_digest.attr,
1082	&dev_attr_fnode_data_digest.attr,
1083	&dev_attr_fnode_snack_req.attr,
1084	&dev_attr_fnode_tcp_timestamp_stat.attr,
1085	&dev_attr_fnode_tcp_nagle_disable.attr,
1086	&dev_attr_fnode_tcp_wsf_disable.attr,
1087	&dev_attr_fnode_tcp_timer_scale.attr,
1088	&dev_attr_fnode_tcp_timestamp_enable.attr,
1089	&dev_attr_fnode_fragment_disable.attr,
1090	&dev_attr_fnode_max_recv_dlength.attr,
1091	&dev_attr_fnode_max_xmit_dlength.attr,
1092	&dev_attr_fnode_keepalive_tmo.attr,
1093	&dev_attr_fnode_port.attr,
1094	&dev_attr_fnode_ipaddress.attr,
1095	&dev_attr_fnode_redirect_ipaddr.attr,
1096	&dev_attr_fnode_max_segment_size.attr,
1097	&dev_attr_fnode_local_port.attr,
1098	&dev_attr_fnode_ipv4_tos.attr,
1099	&dev_attr_fnode_ipv6_traffic_class.attr,
1100	&dev_attr_fnode_ipv6_flow_label.attr,
1101	&dev_attr_fnode_link_local_ipv6.attr,
1102	&dev_attr_fnode_tcp_xmit_wsf.attr,
1103	&dev_attr_fnode_tcp_recv_wsf.attr,
1104	&dev_attr_fnode_statsn.attr,
1105	&dev_attr_fnode_exp_statsn.attr,
1106	NULL,
1107	};
1108
1109	static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1110	struct attribute *attr,
1111	int i)
1112	{
1113	struct device *dev = container_of(kobj, struct device, kobj);
1114	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1115	struct iscsi_transport *t = fnode_conn->transport;
1116	int param;
1117
1118	if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1119	param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1120	} else if (attr == &dev_attr_fnode_header_digest.attr) {
1121	param = ISCSI_FLASHNODE_HDR_DGST_EN;
1122	} else if (attr == &dev_attr_fnode_data_digest.attr) {
1123	param = ISCSI_FLASHNODE_DATA_DGST_EN;
1124	} else if (attr == &dev_attr_fnode_snack_req.attr) {
1125	param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1126	} else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1127	param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1128	} else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1129	param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1130	} else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1131	param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1132	} else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1133	param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1134	} else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1135	param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1136	} else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1137	param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1138	} else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1139	param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1140	} else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1141	param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1142	} else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1143	param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1144	} else if (attr == &dev_attr_fnode_port.attr) {
1145	param = ISCSI_FLASHNODE_PORT;
1146	} else if (attr == &dev_attr_fnode_ipaddress.attr) {
1147	param = ISCSI_FLASHNODE_IPADDR;
1148	} else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1149	param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1150	} else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1151	param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1152	} else if (attr == &dev_attr_fnode_local_port.attr) {
1153	param = ISCSI_FLASHNODE_LOCAL_PORT;
1154	} else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1155	param = ISCSI_FLASHNODE_IPV4_TOS;
1156	} else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1157	param = ISCSI_FLASHNODE_IPV6_TC;
1158	} else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1159	param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1160	} else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1161	param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1162	} else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1163	param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1164	} else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1165	param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1166	} else if (attr == &dev_attr_fnode_statsn.attr) {
1167	param = ISCSI_FLASHNODE_STATSN;
1168	} else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1169	param = ISCSI_FLASHNODE_EXP_STATSN;
1170	} else {
1171	WARN_ONCE(1, "Invalid flashnode connection attr");
1172	return 0;
1173	}
1174
1175	return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1176	}
1177
1178	static struct attribute_group iscsi_flashnode_conn_attr_group = {
1179	.attrs = iscsi_flashnode_conn_attrs,
1180	.is_visible = iscsi_flashnode_conn_attr_is_visible,
1181	};
1182
1183	static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1184	&iscsi_flashnode_conn_attr_group,
1185	NULL,
1186	};
1187
1188	static void iscsi_flashnode_conn_release(struct device *dev)
1189	{
1190	struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1191
1192	kfree(objp: fnode_conn->ipaddress);
1193	kfree(objp: fnode_conn->redirect_ipaddr);
1194	kfree(objp: fnode_conn->link_local_ipv6_addr);
1195	kfree(objp: fnode_conn);
1196	}
1197
1198	static const struct device_type iscsi_flashnode_conn_dev_type = {
1199	.name = "iscsi_flashnode_conn_dev_type",
1200	.groups = iscsi_flashnode_conn_attr_groups,
1201	.release = iscsi_flashnode_conn_release,
1202	};
1203
1204	static struct bus_type iscsi_flashnode_bus;
1205
1206	int iscsi_flashnode_bus_match(struct device *dev,
1207	struct device_driver *drv)
1208	{
1209	if (dev->bus == &iscsi_flashnode_bus)
1210	return 1;
1211	return 0;
1212	}
1213	EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1214
1215	static struct bus_type iscsi_flashnode_bus = {
1216	.name = "iscsi_flashnode",
1217	.match = &iscsi_flashnode_bus_match,
1218	};
1219
1220	/**
1221	* iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1222	* @shost: pointer to host data
1223	* @index: index of flashnode to add in sysfs
1224	* @transport: pointer to transport data
1225	* @dd_size: total size to allocate
1226	*
1227	* Adds a sysfs entry for the flashnode session attributes
1228	*
1229	* Returns:
1230	* pointer to allocated flashnode sess on success
1231	* %NULL on failure
1232	*/
1233	struct iscsi_bus_flash_session *
1234	iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1235	struct iscsi_transport *transport,
1236	int dd_size)
1237	{
1238	struct iscsi_bus_flash_session *fnode_sess;
1239	int err;
1240
1241	fnode_sess = kzalloc(size: sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1242	if (!fnode_sess)
1243	return NULL;
1244
1245	fnode_sess->transport = transport;
1246	fnode_sess->target_id = index;
1247	fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1248	fnode_sess->dev.bus = &iscsi_flashnode_bus;
1249	fnode_sess->dev.parent = &shost->shost_gendev;
1250	dev_set_name(dev: &fnode_sess->dev, name: "flashnode_sess-%u:%u",
1251	shost->host_no, index);
1252
1253	err = device_register(dev: &fnode_sess->dev);
1254	if (err)
1255	goto put_dev;
1256
1257	if (dd_size)
1258	fnode_sess->dd_data = &fnode_sess[1];
1259
1260	return fnode_sess;
1261
1262	put_dev:
1263	put_device(dev: &fnode_sess->dev);
1264	return NULL;
1265	}
1266	EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1267
1268	/**
1269	* iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1270	* @shost: pointer to host data
1271	* @fnode_sess: pointer to the parent flashnode session entry
1272	* @transport: pointer to transport data
1273	* @dd_size: total size to allocate
1274	*
1275	* Adds a sysfs entry for the flashnode connection attributes
1276	*
1277	* Returns:
1278	* pointer to allocated flashnode conn on success
1279	* %NULL on failure
1280	*/
1281	struct iscsi_bus_flash_conn *
1282	iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1283	struct iscsi_bus_flash_session *fnode_sess,
1284	struct iscsi_transport *transport,
1285	int dd_size)
1286	{
1287	struct iscsi_bus_flash_conn *fnode_conn;
1288	int err;
1289
1290	fnode_conn = kzalloc(size: sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1291	if (!fnode_conn)
1292	return NULL;
1293
1294	fnode_conn->transport = transport;
1295	fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1296	fnode_conn->dev.bus = &iscsi_flashnode_bus;
1297	fnode_conn->dev.parent = &fnode_sess->dev;
1298	dev_set_name(dev: &fnode_conn->dev, name: "flashnode_conn-%u:%u:0",
1299	shost->host_no, fnode_sess->target_id);
1300
1301	err = device_register(dev: &fnode_conn->dev);
1302	if (err)
1303	goto put_dev;
1304
1305	if (dd_size)
1306	fnode_conn->dd_data = &fnode_conn[1];
1307
1308	return fnode_conn;
1309
1310	put_dev:
1311	put_device(dev: &fnode_conn->dev);
1312	return NULL;
1313	}
1314	EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1315
1316	/**
1317	* iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1318	* @dev: device to verify
1319	* @data: pointer to data containing value to use for verification
1320	*
1321	* Verifies if the passed device is flashnode conn device
1322	*
1323	* Returns:
1324	* 1 on success
1325	* 0 on failure
1326	*/
1327	static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1328	{
1329	return dev->bus == &iscsi_flashnode_bus;
1330	}
1331
1332	static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1333	{
1334	device_unregister(dev: &fnode_conn->dev);
1335	return 0;
1336	}
1337
1338	static int flashnode_match_index(struct device *dev, void *data)
1339	{
1340	struct iscsi_bus_flash_session *fnode_sess = NULL;
1341	int ret = 0;
1342
1343	if (!iscsi_flashnode_bus_match(dev, NULL))
1344	goto exit_match_index;
1345
1346	fnode_sess = iscsi_dev_to_flash_session(dev);
1347	ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1348
1349	exit_match_index:
1350	return ret;
1351	}
1352
1353	/**
1354	* iscsi_get_flashnode_by_index -finds flashnode session entry by index
1355	* @shost: pointer to host data
1356	* @idx: index to match
1357	*
1358	* Finds the flashnode session object for the passed index
1359	*
1360	* Returns:
1361	* pointer to found flashnode session object on success
1362	* %NULL on failure
1363	*/
1364	static struct iscsi_bus_flash_session *
1365	iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1366	{
1367	struct iscsi_bus_flash_session *fnode_sess = NULL;
1368	struct device *dev;
1369
1370	dev = device_find_child(dev: &shost->shost_gendev, data: &idx,
1371	match: flashnode_match_index);
1372	if (dev)
1373	fnode_sess = iscsi_dev_to_flash_session(dev);
1374
1375	return fnode_sess;
1376	}
1377
1378	/**
1379	* iscsi_find_flashnode_sess - finds flashnode session entry
1380	* @shost: pointer to host data
1381	* @data: pointer to data containing value to use for comparison
1382	* @fn: function pointer that does actual comparison
1383	*
1384	* Finds the flashnode session object comparing the data passed using logic
1385	* defined in passed function pointer
1386	*
1387	* Returns:
1388	* pointer to found flashnode session device object on success
1389	* %NULL on failure
1390	*/
1391	struct device *
1392	iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1393	int (*fn)(struct device *dev, void *data))
1394	{
1395	return device_find_child(dev: &shost->shost_gendev, data, match: fn);
1396	}
1397	EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1398
1399	/**
1400	* iscsi_find_flashnode_conn - finds flashnode connection entry
1401	* @fnode_sess: pointer to parent flashnode session entry
1402	*
1403	* Finds the flashnode connection object comparing the data passed using logic
1404	* defined in passed function pointer
1405	*
1406	* Returns:
1407	* pointer to found flashnode connection device object on success
1408	* %NULL on failure
1409	*/
1410	struct device *
1411	iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1412	{
1413	return device_find_child(dev: &fnode_sess->dev, NULL,
1414	match: iscsi_is_flashnode_conn_dev);
1415	}
1416	EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1417
1418	static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1419	{
1420	if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1421	return 0;
1422
1423	return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1424	}
1425
1426	/**
1427	* iscsi_destroy_flashnode_sess - destroy flashnode session entry
1428	* @fnode_sess: pointer to flashnode session entry to be destroyed
1429	*
1430	* Deletes the flashnode session entry and all children flashnode connection
1431	* entries from sysfs
1432	*/
1433	void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1434	{
1435	int err;
1436
1437	err = device_for_each_child(dev: &fnode_sess->dev, NULL,
1438	fn: iscsi_iter_destroy_flashnode_conn_fn);
1439	if (err)
1440	pr_err("Could not delete all connections for %s. Error %d.\n",
1441	fnode_sess->dev.kobj.name, err);
1442
1443	device_unregister(dev: &fnode_sess->dev);
1444	}
1445	EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1446
1447	static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1448	{
1449	if (!iscsi_flashnode_bus_match(dev, NULL))
1450	return 0;
1451
1452	iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1453	return 0;
1454	}
1455
1456	/**
1457	* iscsi_destroy_all_flashnode - destroy all flashnode session entries
1458	* @shost: pointer to host data
1459	*
1460	* Destroys all the flashnode session entries and all corresponding children
1461	* flashnode connection entries from sysfs
1462	*/
1463	void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1464	{
1465	device_for_each_child(dev: &shost->shost_gendev, NULL,
1466	fn: iscsi_iter_destroy_flashnode_fn);
1467	}
1468	EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1469
1470	/*
1471	* BSG support
1472	*/
1473	/**
1474	* iscsi_bsg_host_dispatch - Dispatch command to LLD.
1475	* @job: bsg job to be processed
1476	*/
1477	static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1478	{
1479	struct Scsi_Host *shost = iscsi_job_to_shost(job);
1480	struct iscsi_bsg_request *req = job->request;
1481	struct iscsi_bsg_reply *reply = job->reply;
1482	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1483	int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
1484	int ret;
1485
1486	/* check if we have the msgcode value at least */
1487	if (job->request_len < sizeof(uint32_t)) {
1488	ret = -ENOMSG;
1489	goto fail_host_msg;
1490	}
1491
1492	/* Validate the host command */
1493	switch (req->msgcode) {
1494	case ISCSI_BSG_HST_VENDOR:
1495	cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1496	if ((shost->hostt->vendor_id == 0L) ||
1497	(req->rqst_data.h_vendor.vendor_id !=
1498	shost->hostt->vendor_id)) {
1499	ret = -ESRCH;
1500	goto fail_host_msg;
1501	}
1502	break;
1503	default:
1504	ret = -EBADR;
1505	goto fail_host_msg;
1506	}
1507
1508	/* check if we really have all the request data needed */
1509	if (job->request_len < cmdlen) {
1510	ret = -ENOMSG;
1511	goto fail_host_msg;
1512	}
1513
1514	ret = i->iscsi_transport->bsg_request(job);
1515	if (!ret)
1516	return 0;
1517
1518	fail_host_msg:
1519	/* return the errno failure code as the only status */
1520	BUG_ON(job->reply_len < sizeof(uint32_t));
1521	reply->reply_payload_rcv_len = 0;
1522	reply->result = ret;
1523	job->reply_len = sizeof(uint32_t);
1524	bsg_job_done(job, result: ret, reply_payload_rcv_len: 0);
1525	return 0;
1526	}
1527
1528	/**
1529	* iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1530	* @shost: shost for iscsi_host
1531	* @ihost: iscsi_cls_host adding the structures to
1532	*/
1533	static int
1534	iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1535	{
1536	struct device *dev = &shost->shost_gendev;
1537	struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1538	struct request_queue *q;
1539	char bsg_name[20];
1540
1541	if (!i->iscsi_transport->bsg_request)
1542	return -ENOTSUPP;
1543
1544	snprintf(buf: bsg_name, size: sizeof(bsg_name), fmt: "iscsi_host%d", shost->host_no);
1545	q = bsg_setup_queue(dev, name: bsg_name, job_fn: iscsi_bsg_host_dispatch, NULL, dd_job_size: 0);
1546	if (IS_ERR(ptr: q)) {
1547	shost_printk(KERN_ERR, shost, "bsg interface failed to "
1548	"initialize - no request queue\n");
1549	return PTR_ERR(ptr: q);
1550	}
1551	__scsi_init_queue(shost, q);
1552
1553	ihost->bsg_q = q;
1554	return 0;
1555	}
1556
1557	static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1558	struct device *cdev)
1559	{
1560	struct Scsi_Host *shost = dev_to_shost(dev);
1561	struct iscsi_cls_host *ihost = shost->shost_data;
1562
1563	memset(ihost, 0, sizeof(*ihost));
1564	mutex_init(&ihost->mutex);
1565
1566	iscsi_bsg_host_add(shost, ihost);
1567	/* ignore any bsg add error - we just can't do sgio */
1568
1569	return 0;
1570	}
1571
1572	static int iscsi_remove_host(struct transport_container *tc,
1573	struct device *dev, struct device *cdev)
1574	{
1575	struct Scsi_Host *shost = dev_to_shost(dev);
1576	struct iscsi_cls_host *ihost = shost->shost_data;
1577
1578	bsg_remove_queue(q: ihost->bsg_q);
1579	return 0;
1580	}
1581
1582	static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1583	"iscsi_host",
1584	iscsi_setup_host,
1585	iscsi_remove_host,
1586	NULL);
1587
1588	static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1589	"iscsi_session",
1590	NULL,
1591	NULL,
1592	NULL);
1593
1594	static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1595	"iscsi_connection",
1596	NULL,
1597	NULL,
1598	NULL);
1599
1600	static struct sock *nls;
1601	static DEFINE_MUTEX(rx_queue_mutex);
1602
1603	static LIST_HEAD(sesslist);
1604	static DEFINE_SPINLOCK(sesslock);
1605	static LIST_HEAD(connlist);
1606	static LIST_HEAD(connlist_err);
1607	static DEFINE_SPINLOCK(connlock);
1608
1609	static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1610	{
1611	struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1612	return sess->sid;
1613	}
1614
1615	/*
1616	* Returns the matching session to a given sid
1617	*/
1618	static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1619	{
1620	unsigned long flags;
1621	struct iscsi_cls_session *sess;
1622
1623	spin_lock_irqsave(&sesslock, flags);
1624	list_for_each_entry(sess, &sesslist, sess_list) {
1625	if (sess->sid == sid) {
1626	spin_unlock_irqrestore(lock: &sesslock, flags);
1627	return sess;
1628	}
1629	}
1630	spin_unlock_irqrestore(lock: &sesslock, flags);
1631	return NULL;
1632	}
1633
1634	/*
1635	* Returns the matching connection to a given sid / cid tuple
1636	*/
1637	static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1638	{
1639	unsigned long flags;
1640	struct iscsi_cls_conn *conn;
1641
1642	spin_lock_irqsave(&connlock, flags);
1643	list_for_each_entry(conn, &connlist, conn_list) {
1644	if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1645	spin_unlock_irqrestore(lock: &connlock, flags);
1646	return conn;
1647	}
1648	}
1649	spin_unlock_irqrestore(lock: &connlock, flags);
1650	return NULL;
1651	}
1652
1653	/*
1654	* The following functions can be used by LLDs that allocate
1655	* their own scsi_hosts or by software iscsi LLDs
1656	*/
1657	static struct {
1658	int value;
1659	char *name;
1660	} iscsi_session_state_names[] = {
1661	{ ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
1662	{ ISCSI_SESSION_FAILED, "FAILED" },
1663	{ ISCSI_SESSION_FREE, "FREE" },
1664	};
1665
1666	static const char *iscsi_session_state_name(int state)
1667	{
1668	int i;
1669	char *name = NULL;
1670
1671	for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1672	if (iscsi_session_state_names[i].value == state) {
1673	name = iscsi_session_state_names[i].name;
1674	break;
1675	}
1676	}
1677	return name;
1678	}
1679
1680	static char *iscsi_session_target_state_name[] = {
1681	[ISCSI_SESSION_TARGET_UNBOUND] = "UNBOUND",
1682	[ISCSI_SESSION_TARGET_ALLOCATED] = "ALLOCATED",
1683	[ISCSI_SESSION_TARGET_SCANNED] = "SCANNED",
1684	[ISCSI_SESSION_TARGET_UNBINDING] = "UNBINDING",
1685	};
1686
1687	int iscsi_session_chkready(struct iscsi_cls_session *session)
1688	{
1689	int err;
1690
1691	switch (session->state) {
1692	case ISCSI_SESSION_LOGGED_IN:
1693	err = 0;
1694	break;
1695	case ISCSI_SESSION_FAILED:
1696	err = DID_IMM_RETRY << 16;
1697	break;
1698	case ISCSI_SESSION_FREE:
1699	err = DID_TRANSPORT_FAILFAST << 16;
1700	break;
1701	default:
1702	err = DID_NO_CONNECT << 16;
1703	break;
1704	}
1705	return err;
1706	}
1707	EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1708
1709	int iscsi_is_session_online(struct iscsi_cls_session *session)
1710	{
1711	unsigned long flags;
1712	int ret = 0;
1713
1714	spin_lock_irqsave(&session->lock, flags);
1715	if (session->state == ISCSI_SESSION_LOGGED_IN)
1716	ret = 1;
1717	spin_unlock_irqrestore(lock: &session->lock, flags);
1718	return ret;
1719	}
1720	EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1721
1722	static void iscsi_session_release(struct device *dev)
1723	{
1724	struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1725	struct Scsi_Host *shost;
1726
1727	shost = iscsi_session_to_shost(session);
1728	scsi_host_put(t: shost);
1729	ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1730	kfree(objp: session);
1731	}
1732
1733	int iscsi_is_session_dev(const struct device *dev)
1734	{
1735	return dev->release == iscsi_session_release;
1736	}
1737	EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1738
1739	static int iscsi_iter_session_fn(struct device *dev, void *data)
1740	{
1741	void (* fn) (struct iscsi_cls_session *) = data;
1742
1743	if (!iscsi_is_session_dev(dev))
1744	return 0;
1745	fn(iscsi_dev_to_session(dev));
1746	return 0;
1747	}
1748
1749	void iscsi_host_for_each_session(struct Scsi_Host *shost,
1750	void (*fn)(struct iscsi_cls_session *))
1751	{
1752	device_for_each_child(dev: &shost->shost_gendev, data: fn,
1753	fn: iscsi_iter_session_fn);
1754	}
1755	EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1756
1757	struct iscsi_scan_data {
1758	unsigned int channel;
1759	unsigned int id;
1760	u64 lun;
1761	enum scsi_scan_mode rescan;
1762	};
1763
1764	static int iscsi_user_scan_session(struct device *dev, void *data)
1765	{
1766	struct iscsi_scan_data *scan_data = data;
1767	struct iscsi_cls_session *session;
1768	struct Scsi_Host *shost;
1769	struct iscsi_cls_host *ihost;
1770	unsigned long flags;
1771	unsigned int id;
1772
1773	if (!iscsi_is_session_dev(dev))
1774	return 0;
1775
1776	session = iscsi_dev_to_session(dev);
1777
1778	ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1779
1780	shost = iscsi_session_to_shost(session);
1781	ihost = shost->shost_data;
1782
1783	mutex_lock(&ihost->mutex);
1784	spin_lock_irqsave(&session->lock, flags);
1785	if (session->state != ISCSI_SESSION_LOGGED_IN) {
1786	spin_unlock_irqrestore(lock: &session->lock, flags);
1787	goto user_scan_exit;
1788	}
1789	id = session->target_id;
1790	spin_unlock_irqrestore(lock: &session->lock, flags);
1791
1792	if (id != ISCSI_MAX_TARGET) {
1793	if ((scan_data->channel == SCAN_WILD_CARD ||
1794	scan_data->channel == 0) &&
1795	(scan_data->id == SCAN_WILD_CARD ||
1796	scan_data->id == id)) {
1797	scsi_scan_target(parent: &session->dev, channel: 0, id,
1798	lun: scan_data->lun, rescan: scan_data->rescan);
1799	spin_lock_irqsave(&session->lock, flags);
1800	session->target_state = ISCSI_SESSION_TARGET_SCANNED;
1801	spin_unlock_irqrestore(lock: &session->lock, flags);
1802	}
1803	}
1804
1805	user_scan_exit:
1806	mutex_unlock(lock: &ihost->mutex);
1807	ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1808	return 0;
1809	}
1810
1811	static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1812	uint id, u64 lun)
1813	{
1814	struct iscsi_scan_data scan_data;
1815
1816	scan_data.channel = channel;
1817	scan_data.id = id;
1818	scan_data.lun = lun;
1819	scan_data.rescan = SCSI_SCAN_MANUAL;
1820
1821	return device_for_each_child(dev: &shost->shost_gendev, data: &scan_data,
1822	fn: iscsi_user_scan_session);
1823	}
1824
1825	static void iscsi_scan_session(struct work_struct *work)
1826	{
1827	struct iscsi_cls_session *session =
1828	container_of(work, struct iscsi_cls_session, scan_work);
1829	struct iscsi_scan_data scan_data;
1830
1831	scan_data.channel = 0;
1832	scan_data.id = SCAN_WILD_CARD;
1833	scan_data.lun = SCAN_WILD_CARD;
1834	scan_data.rescan = SCSI_SCAN_RESCAN;
1835
1836	iscsi_user_scan_session(dev: &session->dev, data: &scan_data);
1837	}
1838
1839	/**
1840	* iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1841	* @cmd: scsi cmd passed to scsi eh handler
1842	*
1843	* If the session is down this function will wait for the recovery
1844	* timer to fire or for the session to be logged back in. If the
1845	* recovery timer fires then FAST_IO_FAIL is returned. The caller
1846	* should pass this error value to the scsi eh.
1847	*/
1848	int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1849	{
1850	struct iscsi_cls_session *session =
1851	starget_to_session(scsi_target(cmd->device));
1852	unsigned long flags;
1853	int ret = 0;
1854
1855	spin_lock_irqsave(&session->lock, flags);
1856	while (session->state != ISCSI_SESSION_LOGGED_IN) {
1857	if (session->state == ISCSI_SESSION_FREE) {
1858	ret = FAST_IO_FAIL;
1859	break;
1860	}
1861	spin_unlock_irqrestore(lock: &session->lock, flags);
1862	msleep(msecs: 1000);
1863	spin_lock_irqsave(&session->lock, flags);
1864	}
1865	spin_unlock_irqrestore(lock: &session->lock, flags);
1866	return ret;
1867	}
1868	EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1869
1870	static void session_recovery_timedout(struct work_struct *work)
1871	{
1872	struct iscsi_cls_session *session =
1873	container_of(work, struct iscsi_cls_session,
1874	recovery_work.work);
1875	unsigned long flags;
1876
1877	iscsi_cls_session_printk(KERN_INFO, session,
1878	"session recovery timed out after %d secs\n",
1879	session->recovery_tmo);
1880
1881	spin_lock_irqsave(&session->lock, flags);
1882	switch (session->state) {
1883	case ISCSI_SESSION_FAILED:
1884	session->state = ISCSI_SESSION_FREE;
1885	break;
1886	case ISCSI_SESSION_LOGGED_IN:
1887	case ISCSI_SESSION_FREE:
1888	/* we raced with the unblock's flush */
1889	spin_unlock_irqrestore(lock: &session->lock, flags);
1890	return;
1891	}
1892	spin_unlock_irqrestore(lock: &session->lock, flags);
1893
1894	ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1895	scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1896	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1897
1898	if (session->transport->session_recovery_timedout)
1899	session->transport->session_recovery_timedout(session);
1900	}
1901
1902	static void __iscsi_unblock_session(struct work_struct *work)
1903	{
1904	struct iscsi_cls_session *session =
1905	container_of(work, struct iscsi_cls_session,
1906	unblock_work);
1907	unsigned long flags;
1908
1909	ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1910
1911	cancel_delayed_work_sync(dwork: &session->recovery_work);
1912	spin_lock_irqsave(&session->lock, flags);
1913	session->state = ISCSI_SESSION_LOGGED_IN;
1914	spin_unlock_irqrestore(lock: &session->lock, flags);
1915	/* start IO */
1916	scsi_target_unblock(&session->dev, SDEV_RUNNING);
1917	ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1918	}
1919
1920	/**
1921	* iscsi_unblock_session - set a session as logged in and start IO.
1922	* @session: iscsi session
1923	*
1924	* Mark a session as ready to accept IO.
1925	*/
1926	void iscsi_unblock_session(struct iscsi_cls_session *session)
1927	{
1928	if (!cancel_work_sync(work: &session->block_work))
1929	cancel_delayed_work_sync(dwork: &session->recovery_work);
1930
1931	queue_work(wq: session->workq, work: &session->unblock_work);
1932	/*
1933	* Blocking the session can be done from any context so we only
1934	* queue the block work. Make sure the unblock work has completed
1935	* because it flushes/cancels the other works and updates the state.
1936	*/
1937	flush_work(work: &session->unblock_work);
1938	}
1939	EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1940
1941	static void __iscsi_block_session(struct work_struct *work)
1942	{
1943	struct iscsi_cls_session *session =
1944	container_of(work, struct iscsi_cls_session,
1945	block_work);
1946	struct Scsi_Host *shost = iscsi_session_to_shost(session);
1947	unsigned long flags;
1948
1949	ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1950	spin_lock_irqsave(&session->lock, flags);
1951	session->state = ISCSI_SESSION_FAILED;
1952	spin_unlock_irqrestore(lock: &session->lock, flags);
1953	scsi_block_targets(shost, dev: &session->dev);
1954	ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1955	if (session->recovery_tmo >= 0)
1956	queue_delayed_work(wq: session->workq,
1957	dwork: &session->recovery_work,
1958	delay: session->recovery_tmo * HZ);
1959	}
1960
1961	void iscsi_block_session(struct iscsi_cls_session *session)
1962	{
1963	queue_work(wq: session->workq, work: &session->block_work);
1964	}
1965	EXPORT_SYMBOL_GPL(iscsi_block_session);
1966
1967	static void __iscsi_unbind_session(struct work_struct *work)
1968	{
1969	struct iscsi_cls_session *session =
1970	container_of(work, struct iscsi_cls_session,
1971	unbind_work);
1972	struct Scsi_Host *shost = iscsi_session_to_shost(session);
1973	struct iscsi_cls_host *ihost = shost->shost_data;
1974	unsigned long flags;
1975	unsigned int target_id;
1976	bool remove_target = true;
1977
1978	ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
1979
1980	/* Prevent new scans and make sure scanning is not in progress */
1981	mutex_lock(&ihost->mutex);
1982	spin_lock_irqsave(&session->lock, flags);
1983	if (session->target_state == ISCSI_SESSION_TARGET_ALLOCATED) {
1984	remove_target = false;
1985	} else if (session->target_state != ISCSI_SESSION_TARGET_SCANNED) {
1986	spin_unlock_irqrestore(lock: &session->lock, flags);
1987	mutex_unlock(lock: &ihost->mutex);
1988	ISCSI_DBG_TRANS_SESSION(session,
1989	"Skipping target unbinding: Session is unbound/unbinding.\n");
1990	return;
1991	}
1992
1993	session->target_state = ISCSI_SESSION_TARGET_UNBINDING;
1994	target_id = session->target_id;
1995	session->target_id = ISCSI_MAX_TARGET;
1996	spin_unlock_irqrestore(lock: &session->lock, flags);
1997	mutex_unlock(lock: &ihost->mutex);
1998
1999	if (remove_target)
2000	scsi_remove_target(&session->dev);
2001
2002	if (session->ida_used)
2003	ida_free(&iscsi_sess_ida, id: target_id);
2004
2005	iscsi_session_event(session, event: ISCSI_KEVENT_UNBIND_SESSION);
2006	ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2007
2008	spin_lock_irqsave(&session->lock, flags);
2009	session->target_state = ISCSI_SESSION_TARGET_UNBOUND;
2010	spin_unlock_irqrestore(lock: &session->lock, flags);
2011	}
2012
2013	static void __iscsi_destroy_session(struct work_struct *work)
2014	{
2015	struct iscsi_cls_session *session =
2016	container_of(work, struct iscsi_cls_session, destroy_work);
2017
2018	session->transport->destroy_session(session);
2019	}
2020
2021	struct iscsi_cls_session *
2022	iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2023	int dd_size)
2024	{
2025	struct iscsi_cls_session *session;
2026
2027	session = kzalloc(size: sizeof(*session) + dd_size,
2028	GFP_KERNEL);
2029	if (!session)
2030	return NULL;
2031
2032	session->transport = transport;
2033	session->creator = -1;
2034	session->recovery_tmo = 120;
2035	session->recovery_tmo_sysfs_override = false;
2036	session->state = ISCSI_SESSION_FREE;
2037	INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2038	INIT_LIST_HEAD(list: &session->sess_list);
2039	INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2040	INIT_WORK(&session->block_work, __iscsi_block_session);
2041	INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2042	INIT_WORK(&session->scan_work, iscsi_scan_session);
2043	INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2044	spin_lock_init(&session->lock);
2045
2046	/* this is released in the dev's release function */
2047	scsi_host_get(shost);
2048	session->dev.parent = &shost->shost_gendev;
2049	session->dev.release = iscsi_session_release;
2050	device_initialize(dev: &session->dev);
2051	if (dd_size)
2052	session->dd_data = &session[1];
2053
2054	ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2055	return session;
2056	}
2057	EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2058
2059	int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2060	{
2061	struct Scsi_Host *shost = iscsi_session_to_shost(session);
2062	unsigned long flags;
2063	int id = 0;
2064	int err;
2065
2066	session->sid = atomic_add_return(i: 1, v: &iscsi_session_nr);
2067
2068	session->workq = alloc_workqueue(fmt: "iscsi_ctrl_%d:%d",
2069	flags: WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, max_active: 0,
2070	shost->host_no, session->sid);
2071	if (!session->workq)
2072	return -ENOMEM;
2073
2074	if (target_id == ISCSI_MAX_TARGET) {
2075	id = ida_alloc(ida: &iscsi_sess_ida, GFP_KERNEL);
2076
2077	if (id < 0) {
2078	iscsi_cls_session_printk(KERN_ERR, session,
2079	"Failure in Target ID Allocation\n");
2080	err = id;
2081	goto destroy_wq;
2082	}
2083	session->target_id = (unsigned int)id;
2084	session->ida_used = true;
2085	} else
2086	session->target_id = target_id;
2087	spin_lock_irqsave(&session->lock, flags);
2088	session->target_state = ISCSI_SESSION_TARGET_ALLOCATED;
2089	spin_unlock_irqrestore(lock: &session->lock, flags);
2090
2091	dev_set_name(dev: &session->dev, name: "session%u", session->sid);
2092	err = device_add(dev: &session->dev);
2093	if (err) {
2094	iscsi_cls_session_printk(KERN_ERR, session,
2095	"could not register session's dev\n");
2096	goto release_ida;
2097	}
2098	err = transport_register_device(dev: &session->dev);
2099	if (err) {
2100	iscsi_cls_session_printk(KERN_ERR, session,
2101	"could not register transport's dev\n");
2102	goto release_dev;
2103	}
2104
2105	spin_lock_irqsave(&sesslock, flags);
2106	list_add(new: &session->sess_list, head: &sesslist);
2107	spin_unlock_irqrestore(lock: &sesslock, flags);
2108
2109	iscsi_session_event(session, event: ISCSI_KEVENT_CREATE_SESSION);
2110	ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2111	return 0;
2112
2113	release_dev:
2114	device_del(dev: &session->dev);
2115	release_ida:
2116	if (session->ida_used)
2117	ida_free(&iscsi_sess_ida, id: session->target_id);
2118	destroy_wq:
2119	destroy_workqueue(wq: session->workq);
2120	return err;
2121	}
2122	EXPORT_SYMBOL_GPL(iscsi_add_session);
2123
2124	/**
2125	* iscsi_create_session - create iscsi class session
2126	* @shost: scsi host
2127	* @transport: iscsi transport
2128	* @dd_size: private driver data size
2129	* @target_id: which target
2130	*
2131	* This can be called from a LLD or iscsi_transport.
2132	*/
2133	struct iscsi_cls_session *
2134	iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2135	int dd_size, unsigned int target_id)
2136	{
2137	struct iscsi_cls_session *session;
2138
2139	session = iscsi_alloc_session(shost, transport, dd_size);
2140	if (!session)
2141	return NULL;
2142
2143	if (iscsi_add_session(session, target_id)) {
2144	iscsi_free_session(session);
2145	return NULL;
2146	}
2147	return session;
2148	}
2149	EXPORT_SYMBOL_GPL(iscsi_create_session);
2150
2151	static void iscsi_conn_release(struct device *dev)
2152	{
2153	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2154	struct device *parent = conn->dev.parent;
2155
2156	ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2157	kfree(objp: conn);
2158	put_device(dev: parent);
2159	}
2160
2161	static int iscsi_is_conn_dev(const struct device *dev)
2162	{
2163	return dev->release == iscsi_conn_release;
2164	}
2165
2166	static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2167	{
2168	if (!iscsi_is_conn_dev(dev))
2169	return 0;
2170
2171	iscsi_remove_conn(iscsi_dev_to_conn(dev));
2172	return 0;
2173	}
2174
2175	void iscsi_remove_session(struct iscsi_cls_session *session)
2176	{
2177	unsigned long flags;
2178	int err;
2179
2180	ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2181
2182	spin_lock_irqsave(&sesslock, flags);
2183	if (!list_empty(head: &session->sess_list))
2184	list_del(entry: &session->sess_list);
2185	spin_unlock_irqrestore(lock: &sesslock, flags);
2186
2187	if (!cancel_work_sync(work: &session->block_work))
2188	cancel_delayed_work_sync(dwork: &session->recovery_work);
2189	cancel_work_sync(work: &session->unblock_work);
2190	/*
2191	* If we are blocked let commands flow again. The lld or iscsi
2192	* layer should set up the queuecommand to fail commands.
2193	* We assume that LLD will not be calling block/unblock while
2194	* removing the session.
2195	*/
2196	spin_lock_irqsave(&session->lock, flags);
2197	session->state = ISCSI_SESSION_FREE;
2198	spin_unlock_irqrestore(lock: &session->lock, flags);
2199
2200	scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2201	/*
2202	* qla4xxx can perform it's own scans when it runs in kernel only
2203	* mode. Make sure to flush those scans.
2204	*/
2205	flush_work(work: &session->scan_work);
2206	/* flush running unbind operations */
2207	flush_work(work: &session->unbind_work);
2208	__iscsi_unbind_session(work: &session->unbind_work);
2209
2210	/* hw iscsi may not have removed all connections from session */
2211	err = device_for_each_child(dev: &session->dev, NULL,
2212	fn: iscsi_iter_destroy_conn_fn);
2213	if (err)
2214	iscsi_cls_session_printk(KERN_ERR, session,
2215	"Could not delete all connections "
2216	"for session. Error %d.\n", err);
2217
2218	transport_unregister_device(dev: &session->dev);
2219
2220	destroy_workqueue(wq: session->workq);
2221
2222	ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2223	device_del(dev: &session->dev);
2224	}
2225	EXPORT_SYMBOL_GPL(iscsi_remove_session);
2226
2227	static void iscsi_stop_conn(struct iscsi_cls_conn *conn, int flag)
2228	{
2229	ISCSI_DBG_TRANS_CONN(conn, "Stopping conn.\n");
2230
2231	switch (flag) {
2232	case STOP_CONN_RECOVER:
2233	WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2234	break;
2235	case STOP_CONN_TERM:
2236	WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2237	break;
2238	default:
2239	iscsi_cls_conn_printk(KERN_ERR, conn, "invalid stop flag %d\n",
2240	flag);
2241	return;
2242	}
2243
2244	conn->transport->stop_conn(conn, flag);
2245	ISCSI_DBG_TRANS_CONN(conn, "Stopping conn done.\n");
2246	}
2247
2248	static void iscsi_ep_disconnect(struct iscsi_cls_conn *conn, bool is_active)
2249	{
2250	struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2251	struct iscsi_endpoint *ep;
2252
2253	ISCSI_DBG_TRANS_CONN(conn, "disconnect ep.\n");
2254	WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2255
2256	if (!conn->ep || !session->transport->ep_disconnect)
2257	return;
2258
2259	ep = conn->ep;
2260	conn->ep = NULL;
2261
2262	session->transport->unbind_conn(conn, is_active);
2263	session->transport->ep_disconnect(ep);
2264	ISCSI_DBG_TRANS_CONN(conn, "disconnect ep done.\n");
2265	}
2266
2267	static void iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn *conn,
2268	struct iscsi_endpoint *ep,
2269	bool is_active)
2270	{
2271	/* Check if this was a conn error and the kernel took ownership */
2272	spin_lock_irq(lock: &conn->lock);
2273	if (!test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2274	spin_unlock_irq(lock: &conn->lock);
2275	iscsi_ep_disconnect(conn, is_active);
2276	} else {
2277	spin_unlock_irq(lock: &conn->lock);
2278	ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
2279	mutex_unlock(lock: &conn->ep_mutex);
2280
2281	flush_work(work: &conn->cleanup_work);
2282	/*
2283	* Userspace is now done with the EP so we can release the ref
2284	* iscsi_cleanup_conn_work_fn took.
2285	*/
2286	iscsi_put_endpoint(ep);
2287	mutex_lock(&conn->ep_mutex);
2288	}
2289	}
2290
2291	static int iscsi_if_stop_conn(struct iscsi_cls_conn *conn, int flag)
2292	{
2293	ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop.\n");
2294	/*
2295	* For offload, iscsid may not know about the ep like when iscsid is
2296	* restarted or for kernel based session shutdown iscsid is not even
2297	* up. For these cases, we do the disconnect now.
2298	*/
2299	mutex_lock(&conn->ep_mutex);
2300	if (conn->ep)
2301	iscsi_if_disconnect_bound_ep(conn, ep: conn->ep, is_active: true);
2302	mutex_unlock(lock: &conn->ep_mutex);
2303
2304	/*
2305	* If this is a termination we have to call stop_conn with that flag
2306	* so the correct states get set. If we haven't run the work yet try to
2307	* avoid the extra run.
2308	*/
2309	if (flag == STOP_CONN_TERM) {
2310	cancel_work_sync(work: &conn->cleanup_work);
2311	iscsi_stop_conn(conn, flag);
2312	} else {
2313	/*
2314	* Figure out if it was the kernel or userspace initiating this.
2315	*/
2316	spin_lock_irq(lock: &conn->lock);
2317	if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, addr: &conn->flags)) {
2318	spin_unlock_irq(lock: &conn->lock);
2319	iscsi_stop_conn(conn, flag);
2320	} else {
2321	spin_unlock_irq(lock: &conn->lock);
2322	ISCSI_DBG_TRANS_CONN(conn,
2323	"flush kernel conn cleanup.\n");
2324	flush_work(work: &conn->cleanup_work);
2325	}
2326	/*
2327	* Only clear for recovery to avoid extra cleanup runs during
2328	* termination.
2329	*/
2330	spin_lock_irq(lock: &conn->lock);
2331	clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, addr: &conn->flags);
2332	spin_unlock_irq(lock: &conn->lock);
2333	}
2334	ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop done.\n");
2335	return 0;
2336	}
2337
2338	static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
2339	{
2340	struct iscsi_cls_conn *conn = container_of(work, struct iscsi_cls_conn,
2341	cleanup_work);
2342	struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2343
2344	mutex_lock(&conn->ep_mutex);
2345	/*
2346	* Get a ref to the ep, so we don't release its ID until after
2347	* userspace is done referencing it in iscsi_if_disconnect_bound_ep.
2348	*/
2349	if (conn->ep)
2350	get_device(dev: &conn->ep->dev);
2351	iscsi_ep_disconnect(conn, is_active: false);
2352
2353	if (system_state != SYSTEM_RUNNING) {
2354	/*
2355	* If the user has set up for the session to never timeout
2356	* then hang like they wanted. For all other cases fail right
2357	* away since userspace is not going to relogin.
2358	*/
2359	if (session->recovery_tmo > 0)
2360	session->recovery_tmo = 0;
2361	}
2362
2363	iscsi_stop_conn(conn, STOP_CONN_RECOVER);
2364	mutex_unlock(lock: &conn->ep_mutex);
2365	ISCSI_DBG_TRANS_CONN(conn, "cleanup done.\n");
2366	}
2367
2368	static int iscsi_iter_force_destroy_conn_fn(struct device *dev, void *data)
2369	{
2370	struct iscsi_transport *transport;
2371	struct iscsi_cls_conn *conn;
2372
2373	if (!iscsi_is_conn_dev(dev))
2374	return 0;
2375
2376	conn = iscsi_dev_to_conn(dev);
2377	transport = conn->transport;
2378
2379	if (READ_ONCE(conn->state) != ISCSI_CONN_DOWN)
2380	iscsi_if_stop_conn(conn, STOP_CONN_TERM);
2381
2382	transport->destroy_conn(conn);
2383	return 0;
2384	}
2385
2386	/**
2387	* iscsi_force_destroy_session - destroy a session from the kernel
2388	* @session: session to destroy
2389	*
2390	* Force the destruction of a session from the kernel. This should only be
2391	* used when userspace is no longer running during system shutdown.
2392	*/
2393	void iscsi_force_destroy_session(struct iscsi_cls_session *session)
2394	{
2395	struct iscsi_transport *transport = session->transport;
2396	unsigned long flags;
2397
2398	WARN_ON_ONCE(system_state == SYSTEM_RUNNING);
2399
2400	spin_lock_irqsave(&sesslock, flags);
2401	if (list_empty(head: &session->sess_list)) {
2402	spin_unlock_irqrestore(lock: &sesslock, flags);
2403	/*
2404	* Conn/ep is already freed. Session is being torn down via
2405	* async path. For shutdown we don't care about it so return.
2406	*/
2407	return;
2408	}
2409	spin_unlock_irqrestore(lock: &sesslock, flags);
2410
2411	device_for_each_child(dev: &session->dev, NULL,
2412	fn: iscsi_iter_force_destroy_conn_fn);
2413	transport->destroy_session(session);
2414	}
2415	EXPORT_SYMBOL_GPL(iscsi_force_destroy_session);
2416
2417	void iscsi_free_session(struct iscsi_cls_session *session)
2418	{
2419	ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2420	iscsi_session_event(session, event: ISCSI_KEVENT_DESTROY_SESSION);
2421	put_device(dev: &session->dev);
2422	}
2423	EXPORT_SYMBOL_GPL(iscsi_free_session);
2424
2425	/**
2426	* iscsi_alloc_conn - alloc iscsi class connection
2427	* @session: iscsi cls session
2428	* @dd_size: private driver data size
2429	* @cid: connection id
2430	*/
2431	struct iscsi_cls_conn *
2432	iscsi_alloc_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2433	{
2434	struct iscsi_transport *transport = session->transport;
2435	struct iscsi_cls_conn *conn;
2436
2437	conn = kzalloc(size: sizeof(*conn) + dd_size, GFP_KERNEL);
2438	if (!conn)
2439	return NULL;
2440	if (dd_size)
2441	conn->dd_data = &conn[1];
2442
2443	mutex_init(&conn->ep_mutex);
2444	spin_lock_init(&conn->lock);
2445	INIT_LIST_HEAD(list: &conn->conn_list);
2446	INIT_WORK(&conn->cleanup_work, iscsi_cleanup_conn_work_fn);
2447	conn->transport = transport;
2448	conn->cid = cid;
2449	WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2450
2451	/* this is released in the dev's release function */
2452	if (!get_device(dev: &session->dev))
2453	goto free_conn;
2454
2455	dev_set_name(dev: &conn->dev, name: "connection%d:%u", session->sid, cid);
2456	device_initialize(dev: &conn->dev);
2457	conn->dev.parent = &session->dev;
2458	conn->dev.release = iscsi_conn_release;
2459
2460	return conn;
2461
2462	free_conn:
2463	kfree(objp: conn);
2464	return NULL;
2465	}
2466	EXPORT_SYMBOL_GPL(iscsi_alloc_conn);
2467
2468	/**
2469	* iscsi_add_conn - add iscsi class connection
2470	* @conn: iscsi cls connection
2471	*
2472	* This will expose iscsi_cls_conn to sysfs so make sure the related
2473	* resources for sysfs attributes are initialized before calling this.
2474	*/
2475	int iscsi_add_conn(struct iscsi_cls_conn *conn)
2476	{
2477	int err;
2478	unsigned long flags;
2479	struct iscsi_cls_session *session = iscsi_dev_to_session(conn->dev.parent);
2480
2481	err = device_add(dev: &conn->dev);
2482	if (err) {
2483	iscsi_cls_session_printk(KERN_ERR, session,
2484	"could not register connection's dev\n");
2485	return err;
2486	}
2487	err = transport_register_device(dev: &conn->dev);
2488	if (err) {
2489	iscsi_cls_session_printk(KERN_ERR, session,
2490	"could not register transport's dev\n");
2491	device_del(dev: &conn->dev);
2492	return err;
2493	}
2494
2495	spin_lock_irqsave(&connlock, flags);
2496	list_add(new: &conn->conn_list, head: &connlist);
2497	spin_unlock_irqrestore(lock: &connlock, flags);
2498
2499	return 0;
2500	}
2501	EXPORT_SYMBOL_GPL(iscsi_add_conn);
2502
2503	/**
2504	* iscsi_remove_conn - remove iscsi class connection from sysfs
2505	* @conn: iscsi cls connection
2506	*
2507	* Remove iscsi_cls_conn from sysfs, and wait for previous
2508	* read/write of iscsi_cls_conn's attributes in sysfs to finish.
2509	*/
2510	void iscsi_remove_conn(struct iscsi_cls_conn *conn)
2511	{
2512	unsigned long flags;
2513
2514	spin_lock_irqsave(&connlock, flags);
2515	list_del(entry: &conn->conn_list);
2516	spin_unlock_irqrestore(lock: &connlock, flags);
2517
2518	transport_unregister_device(dev: &conn->dev);
2519	device_del(dev: &conn->dev);
2520	}
2521	EXPORT_SYMBOL_GPL(iscsi_remove_conn);
2522
2523	void iscsi_put_conn(struct iscsi_cls_conn *conn)
2524	{
2525	put_device(dev: &conn->dev);
2526	}
2527	EXPORT_SYMBOL_GPL(iscsi_put_conn);
2528
2529	void iscsi_get_conn(struct iscsi_cls_conn *conn)
2530	{
2531	get_device(dev: &conn->dev);
2532	}
2533	EXPORT_SYMBOL_GPL(iscsi_get_conn);
2534
2535	/*
2536	* iscsi interface functions
2537	*/
2538	static struct iscsi_internal *
2539	iscsi_if_transport_lookup(struct iscsi_transport *tt)
2540	{
2541	struct iscsi_internal *priv;
2542	unsigned long flags;
2543
2544	spin_lock_irqsave(&iscsi_transport_lock, flags);
2545	list_for_each_entry(priv, &iscsi_transports, list) {
2546	if (tt == priv->iscsi_transport) {
2547	spin_unlock_irqrestore(lock: &iscsi_transport_lock, flags);
2548	return priv;
2549	}
2550	}
2551	spin_unlock_irqrestore(lock: &iscsi_transport_lock, flags);
2552	return NULL;
2553	}
2554
2555	static int
2556	iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2557	{
2558	return nlmsg_multicast(sk: nls, skb, portid: 0, group, flags: gfp);
2559	}
2560
2561	static int
2562	iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2563	{
2564	return nlmsg_unicast(sk: nls, skb, portid);
2565	}
2566
2567	int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2568	char *data, uint32_t data_size)
2569	{
2570	struct nlmsghdr *nlh;
2571	struct sk_buff *skb;
2572	struct iscsi_uevent *ev;
2573	char *pdu;
2574	struct iscsi_internal *priv;
2575	int len = nlmsg_total_size(payload: sizeof(*ev) + sizeof(struct iscsi_hdr) +
2576	data_size);
2577
2578	priv = iscsi_if_transport_lookup(tt: conn->transport);
2579	if (!priv)
2580	return -EINVAL;
2581
2582	skb = alloc_skb(size: len, GFP_ATOMIC);
2583	if (!skb) {
2584	iscsi_conn_error_event(conn, error: ISCSI_ERR_CONN_FAILED);
2585	iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2586	"control PDU: OOM\n");
2587	return -ENOMEM;
2588	}
2589
2590	nlh = __nlmsg_put(skb, portid: 0, seq: 0, type: 0, len: (len - sizeof(*nlh)), flags: 0);
2591	ev = nlmsg_data(nlh);
2592	memset(ev, 0, sizeof(*ev));
2593	ev->transport_handle = iscsi_handle(conn->transport);
2594	ev->type = ISCSI_KEVENT_RECV_PDU;
2595	ev->r.recv_req.cid = conn->cid;
2596	ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2597	pdu = (char*)ev + sizeof(*ev);
2598	memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2599	memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2600
2601	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2602	}
2603	EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2604
2605	int iscsi_offload_mesg(struct Scsi_Host *shost,
2606	struct iscsi_transport *transport, uint32_t type,
2607	char *data, uint16_t data_size)
2608	{
2609	struct nlmsghdr *nlh;
2610	struct sk_buff *skb;
2611	struct iscsi_uevent *ev;
2612	int len = nlmsg_total_size(payload: sizeof(*ev) + data_size);
2613
2614	skb = alloc_skb(size: len, GFP_ATOMIC);
2615	if (!skb) {
2616	printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2617	return -ENOMEM;
2618	}
2619
2620	nlh = __nlmsg_put(skb, portid: 0, seq: 0, type: 0, len: (len - sizeof(*nlh)), flags: 0);
2621	ev = nlmsg_data(nlh);
2622	memset(ev, 0, sizeof(*ev));
2623	ev->type = type;
2624	ev->transport_handle = iscsi_handle(transport);
2625	switch (type) {
2626	case ISCSI_KEVENT_PATH_REQ:
2627	ev->r.req_path.host_no = shost->host_no;
2628	break;
2629	case ISCSI_KEVENT_IF_DOWN:
2630	ev->r.notify_if_down.host_no = shost->host_no;
2631	break;
2632	}
2633
2634	memcpy((char *)ev + sizeof(*ev), data, data_size);
2635
2636	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2637	}
2638	EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2639
2640	void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2641	{
2642	struct nlmsghdr *nlh;
2643	struct sk_buff *skb;
2644	struct iscsi_uevent *ev;
2645	struct iscsi_internal *priv;
2646	int len = nlmsg_total_size(payload: sizeof(*ev));
2647	unsigned long flags;
2648	int state;
2649
2650	spin_lock_irqsave(&conn->lock, flags);
2651	/*
2652	* Userspace will only do a stop call if we are at least bound. And, we
2653	* only need to do the in kernel cleanup if in the UP state so cmds can
2654	* be released to upper layers. If in other states just wait for
2655	* userspace to avoid races that can leave the cleanup_work queued.
2656	*/
2657	state = READ_ONCE(conn->state);
2658	switch (state) {
2659	case ISCSI_CONN_BOUND:
2660	case ISCSI_CONN_UP:
2661	if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP,
2662	addr: &conn->flags)) {
2663	queue_work(wq: iscsi_conn_cleanup_workq,
2664	work: &conn->cleanup_work);
2665	}
2666	break;
2667	default:
2668	ISCSI_DBG_TRANS_CONN(conn, "Got conn error in state %d\n",
2669	state);
2670	break;
2671	}
2672	spin_unlock_irqrestore(lock: &conn->lock, flags);
2673
2674	priv = iscsi_if_transport_lookup(tt: conn->transport);
2675	if (!priv)
2676	return;
2677
2678	skb = alloc_skb(size: len, GFP_ATOMIC);
2679	if (!skb) {
2680	iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2681	"conn error (%d)\n", error);
2682	return;
2683	}
2684
2685	nlh = __nlmsg_put(skb, portid: 0, seq: 0, type: 0, len: (len - sizeof(*nlh)), flags: 0);
2686	ev = nlmsg_data(nlh);
2687	ev->transport_handle = iscsi_handle(conn->transport);
2688	ev->type = ISCSI_KEVENT_CONN_ERROR;
2689	ev->r.connerror.error = error;
2690	ev->r.connerror.cid = conn->cid;
2691	ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2692
2693	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2694
2695	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2696	error);
2697	}
2698	EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2699
2700	void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2701	enum iscsi_conn_state state)
2702	{
2703	struct nlmsghdr *nlh;
2704	struct sk_buff *skb;
2705	struct iscsi_uevent *ev;
2706	struct iscsi_internal *priv;
2707	int len = nlmsg_total_size(payload: sizeof(*ev));
2708
2709	priv = iscsi_if_transport_lookup(tt: conn->transport);
2710	if (!priv)
2711	return;
2712
2713	skb = alloc_skb(size: len, GFP_ATOMIC);
2714	if (!skb) {
2715	iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2716	"conn login (%d)\n", state);
2717	return;
2718	}
2719
2720	nlh = __nlmsg_put(skb, portid: 0, seq: 0, type: 0, len: (len - sizeof(*nlh)), flags: 0);
2721	ev = nlmsg_data(nlh);
2722	ev->transport_handle = iscsi_handle(conn->transport);
2723	ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2724	ev->r.conn_login.state = state;
2725	ev->r.conn_login.cid = conn->cid;
2726	ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2727	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2728
2729	iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2730	state);
2731	}
2732	EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2733
2734	void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2735	enum iscsi_host_event_code code, uint32_t data_size,
2736	uint8_t *data)
2737	{
2738	struct nlmsghdr *nlh;
2739	struct sk_buff *skb;
2740	struct iscsi_uevent *ev;
2741	int len = nlmsg_total_size(payload: sizeof(*ev) + data_size);
2742
2743	skb = alloc_skb(size: len, GFP_NOIO);
2744	if (!skb) {
2745	printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2746	host_no, code);
2747	return;
2748	}
2749
2750	nlh = __nlmsg_put(skb, portid: 0, seq: 0, type: 0, len: (len - sizeof(*nlh)), flags: 0);
2751	ev = nlmsg_data(nlh);
2752	ev->transport_handle = iscsi_handle(transport);
2753	ev->type = ISCSI_KEVENT_HOST_EVENT;
2754	ev->r.host_event.host_no = host_no;
2755	ev->r.host_event.code = code;
2756	ev->r.host_event.data_size = data_size;
2757
2758	if (data_size)
2759	memcpy((char *)ev + sizeof(*ev), data, data_size);
2760
2761	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2762	}
2763	EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2764
2765	void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2766	uint32_t status, uint32_t pid, uint32_t data_size,
2767	uint8_t *data)
2768	{
2769	struct nlmsghdr *nlh;
2770	struct sk_buff *skb;
2771	struct iscsi_uevent *ev;
2772	int len = nlmsg_total_size(payload: sizeof(*ev) + data_size);
2773
2774	skb = alloc_skb(size: len, GFP_NOIO);
2775	if (!skb) {
2776	printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2777	return;
2778	}
2779
2780	nlh = __nlmsg_put(skb, portid: 0, seq: 0, type: 0, len: (len - sizeof(*nlh)), flags: 0);
2781	ev = nlmsg_data(nlh);
2782	ev->transport_handle = iscsi_handle(transport);
2783	ev->type = ISCSI_KEVENT_PING_COMP;
2784	ev->r.ping_comp.host_no = host_no;
2785	ev->r.ping_comp.status = status;
2786	ev->r.ping_comp.pid = pid;
2787	ev->r.ping_comp.data_size = data_size;
2788	memcpy((char *)ev + sizeof(*ev), data, data_size);
2789
2790	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2791	}
2792	EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2793
2794	static int
2795	iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2796	{
2797	struct sk_buff *skb;
2798	struct nlmsghdr *nlh;
2799	int len = nlmsg_total_size(payload: size);
2800
2801	skb = alloc_skb(size: len, GFP_ATOMIC);
2802	if (!skb) {
2803	printk(KERN_ERR "Could not allocate skb to send reply.\n");
2804	return -ENOMEM;
2805	}
2806
2807	nlh = __nlmsg_put(skb, portid: 0, seq: 0, type, len: (len - sizeof(*nlh)), flags: 0);
2808	memcpy(nlmsg_data(nlh), payload, size);
2809	return iscsi_unicast_skb(skb, portid);
2810	}
2811
2812	static int
2813	iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2814	{
2815	struct iscsi_uevent *ev = nlmsg_data(nlh);
2816	struct iscsi_stats *stats;
2817	struct sk_buff *skbstat;
2818	struct iscsi_cls_conn *conn;
2819	struct nlmsghdr *nlhstat;
2820	struct iscsi_uevent *evstat;
2821	struct iscsi_internal *priv;
2822	int len = nlmsg_total_size(payload: sizeof(*ev) +
2823	sizeof(struct iscsi_stats) +
2824	sizeof(struct iscsi_stats_custom) *
2825	ISCSI_STATS_CUSTOM_MAX);
2826	int err = 0;
2827
2828	priv = iscsi_if_transport_lookup(tt: transport);
2829	if (!priv)
2830	return -EINVAL;
2831
2832	conn = iscsi_conn_lookup(sid: ev->u.get_stats.sid, cid: ev->u.get_stats.cid);
2833	if (!conn)
2834	return -EEXIST;
2835
2836	do {
2837	int actual_size;
2838
2839	skbstat = alloc_skb(size: len, GFP_ATOMIC);
2840	if (!skbstat) {
2841	iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2842	"deliver stats: OOM\n");
2843	return -ENOMEM;
2844	}
2845
2846	nlhstat = __nlmsg_put(skb: skbstat, portid: 0, seq: 0, type: 0,
2847	len: (len - sizeof(*nlhstat)), flags: 0);
2848	evstat = nlmsg_data(nlh: nlhstat);
2849	memset(evstat, 0, sizeof(*evstat));
2850	evstat->transport_handle = iscsi_handle(conn->transport);
2851	evstat->type = nlh->nlmsg_type;
2852	evstat->u.get_stats.cid =
2853	ev->u.get_stats.cid;
2854	evstat->u.get_stats.sid =
2855	ev->u.get_stats.sid;
2856	stats = (struct iscsi_stats *)
2857	((char*)evstat + sizeof(*evstat));
2858	memset(stats, 0, sizeof(*stats));
2859
2860	transport->get_stats(conn, stats);
2861	actual_size = nlmsg_total_size(payload: sizeof(struct iscsi_uevent) +
2862	sizeof(struct iscsi_stats) +
2863	sizeof(struct iscsi_stats_custom) *
2864	stats->custom_length);
2865	actual_size -= sizeof(*nlhstat);
2866	actual_size = nlmsg_msg_size(payload: actual_size);
2867	skb_trim(skb: skbstat, NLMSG_ALIGN(actual_size));
2868	nlhstat->nlmsg_len = actual_size;
2869
2870	err = iscsi_multicast_skb(skb: skbstat, ISCSI_NL_GRP_ISCSID,
2871	GFP_ATOMIC);
2872	} while (err < 0 && err != -ECONNREFUSED);
2873
2874	return err;
2875	}
2876
2877	/**
2878	* iscsi_session_event - send session destr. completion event
2879	* @session: iscsi class session
2880	* @event: type of event
2881	*/
2882	int iscsi_session_event(struct iscsi_cls_session *session,
2883	enum iscsi_uevent_e event)
2884	{
2885	struct iscsi_internal *priv;
2886	struct Scsi_Host *shost;
2887	struct iscsi_uevent *ev;
2888	struct sk_buff *skb;
2889	struct nlmsghdr *nlh;
2890	int rc, len = nlmsg_total_size(payload: sizeof(*ev));
2891
2892	priv = iscsi_if_transport_lookup(tt: session->transport);
2893	if (!priv)
2894	return -EINVAL;
2895	shost = iscsi_session_to_shost(session);
2896
2897	skb = alloc_skb(size: len, GFP_KERNEL);
2898	if (!skb) {
2899	iscsi_cls_session_printk(KERN_ERR, session,
2900	"Cannot notify userspace of session "
2901	"event %u\n", event);
2902	return -ENOMEM;
2903	}
2904
2905	nlh = __nlmsg_put(skb, portid: 0, seq: 0, type: 0, len: (len - sizeof(*nlh)), flags: 0);
2906	ev = nlmsg_data(nlh);
2907	ev->transport_handle = iscsi_handle(session->transport);
2908
2909	ev->type = event;
2910	switch (event) {
2911	case ISCSI_KEVENT_DESTROY_SESSION:
2912	ev->r.d_session.host_no = shost->host_no;
2913	ev->r.d_session.sid = session->sid;
2914	break;
2915	case ISCSI_KEVENT_CREATE_SESSION:
2916	ev->r.c_session_ret.host_no = shost->host_no;
2917	ev->r.c_session_ret.sid = session->sid;
2918	break;
2919	case ISCSI_KEVENT_UNBIND_SESSION:
2920	ev->r.unbind_session.host_no = shost->host_no;
2921	ev->r.unbind_session.sid = session->sid;
2922	break;
2923	default:
2924	iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2925	"%u.\n", event);
2926	kfree_skb(skb);
2927	return -EINVAL;
2928	}
2929
2930	/*
2931	* this will occur if the daemon is not up, so we just warn
2932	* the user and when the daemon is restarted it will handle it
2933	*/
2934	rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2935	if (rc == -ESRCH)
2936	iscsi_cls_session_printk(KERN_ERR, session,
2937	"Cannot notify userspace of session "
2938	"event %u. Check iscsi daemon\n",
2939	event);
2940
2941	ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2942	event, rc);
2943	return rc;
2944	}
2945	EXPORT_SYMBOL_GPL(iscsi_session_event);
2946
2947	static int
2948	iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2949	struct iscsi_uevent *ev, pid_t pid,
2950	uint32_t initial_cmdsn, uint16_t cmds_max,
2951	uint16_t queue_depth)
2952	{
2953	struct iscsi_transport *transport = priv->iscsi_transport;
2954	struct iscsi_cls_session *session;
2955	struct Scsi_Host *shost;
2956
2957	session = transport->create_session(ep, cmds_max, queue_depth,
2958	initial_cmdsn);
2959	if (!session)
2960	return -ENOMEM;
2961
2962	session->creator = pid;
2963	shost = iscsi_session_to_shost(session);
2964	ev->r.c_session_ret.host_no = shost->host_no;
2965	ev->r.c_session_ret.sid = session->sid;
2966	ISCSI_DBG_TRANS_SESSION(session,
2967	"Completed creating transport session\n");
2968	return 0;
2969	}
2970
2971	static int
2972	iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2973	{
2974	struct iscsi_cls_conn *conn;
2975	struct iscsi_cls_session *session;
2976
2977	session = iscsi_session_lookup(sid: ev->u.c_conn.sid);
2978	if (!session) {
2979	printk(KERN_ERR "iscsi: invalid session %d.\n",
2980	ev->u.c_conn.sid);
2981	return -EINVAL;
2982	}
2983
2984	conn = transport->create_conn(session, ev->u.c_conn.cid);
2985	if (!conn) {
2986	iscsi_cls_session_printk(KERN_ERR, session,
2987	"couldn't create a new connection.");
2988	return -ENOMEM;
2989	}
2990
2991	ev->r.c_conn_ret.sid = session->sid;
2992	ev->r.c_conn_ret.cid = conn->cid;
2993
2994	ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2995	return 0;
2996	}
2997
2998	static int
2999	iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3000	{
3001	struct iscsi_cls_conn *conn;
3002
3003	conn = iscsi_conn_lookup(sid: ev->u.d_conn.sid, cid: ev->u.d_conn.cid);
3004	if (!conn)
3005	return -EINVAL;
3006
3007	ISCSI_DBG_TRANS_CONN(conn, "Flushing cleanup during destruction\n");
3008	flush_work(work: &conn->cleanup_work);
3009	ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
3010
3011	if (transport->destroy_conn)
3012	transport->destroy_conn(conn);
3013	return 0;
3014	}
3015
3016	static int
3017	iscsi_if_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3018	{
3019	char *data = (char*)ev + sizeof(*ev);
3020	struct iscsi_cls_conn *conn;
3021	struct iscsi_cls_session *session;
3022	int err = 0, value = 0, state;
3023
3024	if (ev->u.set_param.len > rlen ||
3025	ev->u.set_param.len > PAGE_SIZE)
3026	return -EINVAL;
3027
3028	session = iscsi_session_lookup(sid: ev->u.set_param.sid);
3029	conn = iscsi_conn_lookup(sid: ev->u.set_param.sid, cid: ev->u.set_param.cid);
3030	if (!conn || !session)
3031	return -EINVAL;
3032
3033	/* data will be regarded as NULL-ended string, do length check */
3034	if (strlen(data) > ev->u.set_param.len)
3035	return -EINVAL;
3036
3037	switch (ev->u.set_param.param) {
3038	case ISCSI_PARAM_SESS_RECOVERY_TMO:
3039	sscanf(data, "%d", &value);
3040	if (!session->recovery_tmo_sysfs_override)
3041	session->recovery_tmo = value;
3042	break;
3043	default:
3044	state = READ_ONCE(conn->state);
3045	if (state == ISCSI_CONN_BOUND || state == ISCSI_CONN_UP) {
3046	err = transport->set_param(conn, ev->u.set_param.param,
3047	data, ev->u.set_param.len);
3048	} else {
3049	return -ENOTCONN;
3050	}
3051	}
3052
3053	return err;
3054	}
3055
3056	static int iscsi_if_ep_connect(struct iscsi_transport *transport,
3057	struct iscsi_uevent *ev, int msg_type)
3058	{
3059	struct iscsi_endpoint *ep;
3060	struct sockaddr *dst_addr;
3061	struct Scsi_Host *shost = NULL;
3062	int non_blocking, err = 0;
3063
3064	if (!transport->ep_connect)
3065	return -EINVAL;
3066
3067	if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
3068	shost = scsi_host_lookup(hostnum: ev->u.ep_connect_through_host.host_no);
3069	if (!shost) {
3070	printk(KERN_ERR "ep connect failed. Could not find "
3071	"host no %u\n",
3072	ev->u.ep_connect_through_host.host_no);
3073	return -ENODEV;
3074	}
3075	non_blocking = ev->u.ep_connect_through_host.non_blocking;
3076	} else
3077	non_blocking = ev->u.ep_connect.non_blocking;
3078
3079	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3080	ep = transport->ep_connect(shost, dst_addr, non_blocking);
3081	if (IS_ERR(ptr: ep)) {
3082	err = PTR_ERR(ptr: ep);
3083	goto release_host;
3084	}
3085
3086	ev->r.ep_connect_ret.handle = ep->id;
3087	release_host:
3088	if (shost)
3089	scsi_host_put(t: shost);
3090	return err;
3091	}
3092
3093	static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
3094	u64 ep_handle)
3095	{
3096	struct iscsi_cls_conn *conn;
3097	struct iscsi_endpoint *ep;
3098
3099	if (!transport->ep_disconnect)
3100	return -EINVAL;
3101
3102	ep = iscsi_lookup_endpoint(ep_handle);
3103	if (!ep)
3104	return -EINVAL;
3105
3106	conn = ep->conn;
3107	if (!conn) {
3108	/*
3109	* conn was not even bound yet, so we can't get iscsi conn
3110	* failures yet.
3111	*/
3112	transport->ep_disconnect(ep);
3113	goto put_ep;
3114	}
3115
3116	mutex_lock(&conn->ep_mutex);
3117	iscsi_if_disconnect_bound_ep(conn, ep, is_active: false);
3118	mutex_unlock(lock: &conn->ep_mutex);
3119	put_ep:
3120	iscsi_put_endpoint(ep);
3121	return 0;
3122	}
3123
3124	static int
3125	iscsi_if_transport_ep(struct iscsi_transport *transport,
3126	struct iscsi_uevent *ev, int msg_type, u32 rlen)
3127	{
3128	struct iscsi_endpoint *ep;
3129	int rc = 0;
3130
3131	switch (msg_type) {
3132	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3133	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3134	if (rlen < sizeof(struct sockaddr))
3135	rc = -EINVAL;
3136	else
3137	rc = iscsi_if_ep_connect(transport, ev, msg_type);
3138	break;
3139	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3140	if (!transport->ep_poll)
3141	return -EINVAL;
3142
3143	ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
3144	if (!ep)
3145	return -EINVAL;
3146
3147	ev->r.retcode = transport->ep_poll(ep,
3148	ev->u.ep_poll.timeout_ms);
3149	iscsi_put_endpoint(ep);
3150	break;
3151	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3152	rc = iscsi_if_ep_disconnect(transport,
3153	ep_handle: ev->u.ep_disconnect.ep_handle);
3154	break;
3155	}
3156	return rc;
3157	}
3158
3159	static int
3160	iscsi_tgt_dscvr(struct iscsi_transport *transport,
3161	struct iscsi_uevent *ev, u32 rlen)
3162	{
3163	struct Scsi_Host *shost;
3164	struct sockaddr *dst_addr;
3165	int err;
3166
3167	if (rlen < sizeof(*dst_addr))
3168	return -EINVAL;
3169
3170	if (!transport->tgt_dscvr)
3171	return -EINVAL;
3172
3173	shost = scsi_host_lookup(hostnum: ev->u.tgt_dscvr.host_no);
3174	if (!shost) {
3175	printk(KERN_ERR "target discovery could not find host no %u\n",
3176	ev->u.tgt_dscvr.host_no);
3177	return -ENODEV;
3178	}
3179
3180
3181	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3182	err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3183	ev->u.tgt_dscvr.enable, dst_addr);
3184	scsi_host_put(t: shost);
3185	return err;
3186	}
3187
3188	static int
3189	iscsi_set_host_param(struct iscsi_transport *transport,
3190	struct iscsi_uevent *ev, u32 rlen)
3191	{
3192	char *data = (char*)ev + sizeof(*ev);
3193	struct Scsi_Host *shost;
3194	int err;
3195
3196	if (!transport->set_host_param)
3197	return -ENOSYS;
3198
3199	if (ev->u.set_host_param.len > rlen ||
3200	ev->u.set_host_param.len > PAGE_SIZE)
3201	return -EINVAL;
3202
3203	shost = scsi_host_lookup(hostnum: ev->u.set_host_param.host_no);
3204	if (!shost) {
3205	printk(KERN_ERR "set_host_param could not find host no %u\n",
3206	ev->u.set_host_param.host_no);
3207	return -ENODEV;
3208	}
3209
3210	/* see similar check in iscsi_if_set_param() */
3211	if (strlen(data) > ev->u.set_host_param.len)
3212	return -EINVAL;
3213
3214	err = transport->set_host_param(shost, ev->u.set_host_param.param,
3215	data, ev->u.set_host_param.len);
3216	scsi_host_put(t: shost);
3217	return err;
3218	}
3219
3220	static int
3221	iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3222	{
3223	struct Scsi_Host *shost;
3224	struct iscsi_path *params;
3225	int err;
3226
3227	if (rlen < sizeof(*params))
3228	return -EINVAL;
3229
3230	if (!transport->set_path)
3231	return -ENOSYS;
3232
3233	shost = scsi_host_lookup(hostnum: ev->u.set_path.host_no);
3234	if (!shost) {
3235	printk(KERN_ERR "set path could not find host no %u\n",
3236	ev->u.set_path.host_no);
3237	return -ENODEV;
3238	}
3239
3240	params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3241	err = transport->set_path(shost, params);
3242
3243	scsi_host_put(t: shost);
3244	return err;
3245	}
3246
3247	static int iscsi_session_has_conns(int sid)
3248	{
3249	struct iscsi_cls_conn *conn;
3250	unsigned long flags;
3251	int found = 0;
3252
3253	spin_lock_irqsave(&connlock, flags);
3254	list_for_each_entry(conn, &connlist, conn_list) {
3255	if (iscsi_conn_get_sid(conn) == sid) {
3256	found = 1;
3257	break;
3258	}
3259	}
3260	spin_unlock_irqrestore(lock: &connlock, flags);
3261
3262	return found;
3263	}
3264
3265	static int
3266	iscsi_set_iface_params(struct iscsi_transport *transport,
3267	struct iscsi_uevent *ev, uint32_t len)
3268	{
3269	char *data = (char *)ev + sizeof(*ev);
3270	struct Scsi_Host *shost;
3271	int err;
3272
3273	if (!transport->set_iface_param)
3274	return -ENOSYS;
3275
3276	shost = scsi_host_lookup(hostnum: ev->u.set_iface_params.host_no);
3277	if (!shost) {
3278	printk(KERN_ERR "set_iface_params could not find host no %u\n",
3279	ev->u.set_iface_params.host_no);
3280	return -ENODEV;
3281	}
3282
3283	err = transport->set_iface_param(shost, data, len);
3284	scsi_host_put(t: shost);
3285	return err;
3286	}
3287
3288	static int
3289	iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3290	{
3291	struct Scsi_Host *shost;
3292	struct sockaddr *dst_addr;
3293	int err;
3294
3295	if (rlen < sizeof(*dst_addr))
3296	return -EINVAL;
3297
3298	if (!transport->send_ping)
3299	return -ENOSYS;
3300
3301	shost = scsi_host_lookup(hostnum: ev->u.iscsi_ping.host_no);
3302	if (!shost) {
3303	printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3304	ev->u.iscsi_ping.host_no);
3305	return -ENODEV;
3306	}
3307
3308	dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3309	err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3310	ev->u.iscsi_ping.iface_type,
3311	ev->u.iscsi_ping.payload_size,
3312	ev->u.iscsi_ping.pid,
3313	dst_addr);
3314	scsi_host_put(t: shost);
3315	return err;
3316	}
3317
3318	static int
3319	iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3320	{
3321	struct iscsi_uevent *ev = nlmsg_data(nlh);
3322	struct Scsi_Host *shost = NULL;
3323	struct iscsi_chap_rec *chap_rec;
3324	struct iscsi_internal *priv;
3325	struct sk_buff *skbchap;
3326	struct nlmsghdr *nlhchap;
3327	struct iscsi_uevent *evchap;
3328	uint32_t chap_buf_size;
3329	int len, err = 0;
3330	char *buf;
3331
3332	if (!transport->get_chap)
3333	return -EINVAL;
3334
3335	priv = iscsi_if_transport_lookup(tt: transport);
3336	if (!priv)
3337	return -EINVAL;
3338
3339	chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3340	len = nlmsg_total_size(payload: sizeof(*ev) + chap_buf_size);
3341
3342	shost = scsi_host_lookup(hostnum: ev->u.get_chap.host_no);
3343	if (!shost) {
3344	printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3345	__func__, ev->u.get_chap.host_no);
3346	return -ENODEV;
3347	}
3348
3349	do {
3350	int actual_size;
3351
3352	skbchap = alloc_skb(size: len, GFP_KERNEL);
3353	if (!skbchap) {
3354	printk(KERN_ERR "can not deliver chap: OOM\n");
3355	err = -ENOMEM;
3356	goto exit_get_chap;
3357	}
3358
3359	nlhchap = __nlmsg_put(skb: skbchap, portid: 0, seq: 0, type: 0,
3360	len: (len - sizeof(*nlhchap)), flags: 0);
3361	evchap = nlmsg_data(nlh: nlhchap);
3362	memset(evchap, 0, sizeof(*evchap));
3363	evchap->transport_handle = iscsi_handle(transport);
3364	evchap->type = nlh->nlmsg_type;
3365	evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3366	evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3367	evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3368	buf = (char *)evchap + sizeof(*evchap);
3369	memset(buf, 0, chap_buf_size);
3370
3371	err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3372	&evchap->u.get_chap.num_entries, buf);
3373
3374	actual_size = nlmsg_total_size(payload: sizeof(*ev) + chap_buf_size);
3375	skb_trim(skb: skbchap, NLMSG_ALIGN(actual_size));
3376	nlhchap->nlmsg_len = actual_size;
3377
3378	err = iscsi_multicast_skb(skb: skbchap, ISCSI_NL_GRP_ISCSID,
3379	GFP_KERNEL);
3380	} while (err < 0 && err != -ECONNREFUSED);
3381
3382	exit_get_chap:
3383	scsi_host_put(t: shost);
3384	return err;
3385	}
3386
3387	static int iscsi_set_chap(struct iscsi_transport *transport,
3388	struct iscsi_uevent *ev, uint32_t len)
3389	{
3390	char *data = (char *)ev + sizeof(*ev);
3391	struct Scsi_Host *shost;
3392	int err = 0;
3393
3394	if (!transport->set_chap)
3395	return -ENOSYS;
3396
3397	shost = scsi_host_lookup(hostnum: ev->u.set_path.host_no);
3398	if (!shost) {
3399	pr_err("%s could not find host no %u\n",
3400	__func__, ev->u.set_path.host_no);
3401	return -ENODEV;
3402	}
3403
3404	err = transport->set_chap(shost, data, len);
3405	scsi_host_put(t: shost);
3406	return err;
3407	}
3408
3409	static int iscsi_delete_chap(struct iscsi_transport *transport,
3410	struct iscsi_uevent *ev)
3411	{
3412	struct Scsi_Host *shost;
3413	int err = 0;
3414
3415	if (!transport->delete_chap)
3416	return -ENOSYS;
3417
3418	shost = scsi_host_lookup(hostnum: ev->u.delete_chap.host_no);
3419	if (!shost) {
3420	printk(KERN_ERR "%s could not find host no %u\n",
3421	__func__, ev->u.delete_chap.host_no);
3422	return -ENODEV;
3423	}
3424
3425	err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3426	scsi_host_put(t: shost);
3427	return err;
3428	}
3429
3430	static const struct {
3431	enum iscsi_discovery_parent_type value;
3432	char *name;
3433	} iscsi_discovery_parent_names[] = {
3434	{ISCSI_DISC_PARENT_UNKNOWN, "Unknown" },
3435	{ISCSI_DISC_PARENT_SENDTGT, "Sendtarget" },
3436	{ISCSI_DISC_PARENT_ISNS, "isns" },
3437	};
3438
3439	char *iscsi_get_discovery_parent_name(int parent_type)
3440	{
3441	int i;
3442	char *state = "Unknown!";
3443
3444	for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3445	if (iscsi_discovery_parent_names[i].value & parent_type) {
3446	state = iscsi_discovery_parent_names[i].name;
3447	break;
3448	}
3449	}
3450	return state;
3451	}
3452	EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3453
3454	static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3455	struct iscsi_uevent *ev, uint32_t len)
3456	{
3457	char *data = (char *)ev + sizeof(*ev);
3458	struct Scsi_Host *shost;
3459	struct iscsi_bus_flash_session *fnode_sess;
3460	struct iscsi_bus_flash_conn *fnode_conn;
3461	struct device *dev;
3462	uint32_t idx;
3463	int err = 0;
3464
3465	if (!transport->set_flashnode_param) {
3466	err = -ENOSYS;
3467	goto exit_set_fnode;
3468	}
3469
3470	shost = scsi_host_lookup(hostnum: ev->u.set_flashnode.host_no);
3471	if (!shost) {
3472	pr_err("%s could not find host no %u\n",
3473	__func__, ev->u.set_flashnode.host_no);
3474	err = -ENODEV;
3475	goto exit_set_fnode;
3476	}
3477
3478	idx = ev->u.set_flashnode.flashnode_idx;
3479	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3480	if (!fnode_sess) {
3481	pr_err("%s could not find flashnode %u for host no %u\n",
3482	__func__, idx, ev->u.set_flashnode.host_no);
3483	err = -ENODEV;
3484	goto put_host;
3485	}
3486
3487	dev = iscsi_find_flashnode_conn(fnode_sess);
3488	if (!dev) {
3489	err = -ENODEV;
3490	goto put_sess;
3491	}
3492
3493	fnode_conn = iscsi_dev_to_flash_conn(dev);
3494	err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3495	put_device(dev);
3496
3497	put_sess:
3498	put_device(dev: &fnode_sess->dev);
3499
3500	put_host:
3501	scsi_host_put(t: shost);
3502
3503	exit_set_fnode:
3504	return err;
3505	}
3506
3507	static int iscsi_new_flashnode(struct iscsi_transport *transport,
3508	struct iscsi_uevent *ev, uint32_t len)
3509	{
3510	char *data = (char *)ev + sizeof(*ev);
3511	struct Scsi_Host *shost;
3512	int index;
3513	int err = 0;
3514
3515	if (!transport->new_flashnode) {
3516	err = -ENOSYS;
3517	goto exit_new_fnode;
3518	}
3519
3520	shost = scsi_host_lookup(hostnum: ev->u.new_flashnode.host_no);
3521	if (!shost) {
3522	pr_err("%s could not find host no %u\n",
3523	__func__, ev->u.new_flashnode.host_no);
3524	err = -ENODEV;
3525	goto put_host;
3526	}
3527
3528	index = transport->new_flashnode(shost, data, len);
3529
3530	if (index >= 0)
3531	ev->r.new_flashnode_ret.flashnode_idx = index;
3532	else
3533	err = -EIO;
3534
3535	put_host:
3536	scsi_host_put(t: shost);
3537
3538	exit_new_fnode:
3539	return err;
3540	}
3541
3542	static int iscsi_del_flashnode(struct iscsi_transport *transport,
3543	struct iscsi_uevent *ev)
3544	{
3545	struct Scsi_Host *shost;
3546	struct iscsi_bus_flash_session *fnode_sess;
3547	uint32_t idx;
3548	int err = 0;
3549
3550	if (!transport->del_flashnode) {
3551	err = -ENOSYS;
3552	goto exit_del_fnode;
3553	}
3554
3555	shost = scsi_host_lookup(hostnum: ev->u.del_flashnode.host_no);
3556	if (!shost) {
3557	pr_err("%s could not find host no %u\n",
3558	__func__, ev->u.del_flashnode.host_no);
3559	err = -ENODEV;
3560	goto put_host;
3561	}
3562
3563	idx = ev->u.del_flashnode.flashnode_idx;
3564	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3565	if (!fnode_sess) {
3566	pr_err("%s could not find flashnode %u for host no %u\n",
3567	__func__, idx, ev->u.del_flashnode.host_no);
3568	err = -ENODEV;
3569	goto put_host;
3570	}
3571
3572	err = transport->del_flashnode(fnode_sess);
3573	put_device(dev: &fnode_sess->dev);
3574
3575	put_host:
3576	scsi_host_put(t: shost);
3577
3578	exit_del_fnode:
3579	return err;
3580	}
3581
3582	static int iscsi_login_flashnode(struct iscsi_transport *transport,
3583	struct iscsi_uevent *ev)
3584	{
3585	struct Scsi_Host *shost;
3586	struct iscsi_bus_flash_session *fnode_sess;
3587	struct iscsi_bus_flash_conn *fnode_conn;
3588	struct device *dev;
3589	uint32_t idx;
3590	int err = 0;
3591
3592	if (!transport->login_flashnode) {
3593	err = -ENOSYS;
3594	goto exit_login_fnode;
3595	}
3596
3597	shost = scsi_host_lookup(hostnum: ev->u.login_flashnode.host_no);
3598	if (!shost) {
3599	pr_err("%s could not find host no %u\n",
3600	__func__, ev->u.login_flashnode.host_no);
3601	err = -ENODEV;
3602	goto put_host;
3603	}
3604
3605	idx = ev->u.login_flashnode.flashnode_idx;
3606	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3607	if (!fnode_sess) {
3608	pr_err("%s could not find flashnode %u for host no %u\n",
3609	__func__, idx, ev->u.login_flashnode.host_no);
3610	err = -ENODEV;
3611	goto put_host;
3612	}
3613
3614	dev = iscsi_find_flashnode_conn(fnode_sess);
3615	if (!dev) {
3616	err = -ENODEV;
3617	goto put_sess;
3618	}
3619
3620	fnode_conn = iscsi_dev_to_flash_conn(dev);
3621	err = transport->login_flashnode(fnode_sess, fnode_conn);
3622	put_device(dev);
3623
3624	put_sess:
3625	put_device(dev: &fnode_sess->dev);
3626
3627	put_host:
3628	scsi_host_put(t: shost);
3629
3630	exit_login_fnode:
3631	return err;
3632	}
3633
3634	static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3635	struct iscsi_uevent *ev)
3636	{
3637	struct Scsi_Host *shost;
3638	struct iscsi_bus_flash_session *fnode_sess;
3639	struct iscsi_bus_flash_conn *fnode_conn;
3640	struct device *dev;
3641	uint32_t idx;
3642	int err = 0;
3643
3644	if (!transport->logout_flashnode) {
3645	err = -ENOSYS;
3646	goto exit_logout_fnode;
3647	}
3648
3649	shost = scsi_host_lookup(hostnum: ev->u.logout_flashnode.host_no);
3650	if (!shost) {
3651	pr_err("%s could not find host no %u\n",
3652	__func__, ev->u.logout_flashnode.host_no);
3653	err = -ENODEV;
3654	goto put_host;
3655	}
3656
3657	idx = ev->u.logout_flashnode.flashnode_idx;
3658	fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3659	if (!fnode_sess) {
3660	pr_err("%s could not find flashnode %u for host no %u\n",
3661	__func__, idx, ev->u.logout_flashnode.host_no);
3662	err = -ENODEV;
3663	goto put_host;
3664	}
3665
3666	dev = iscsi_find_flashnode_conn(fnode_sess);
3667	if (!dev) {
3668	err = -ENODEV;
3669	goto put_sess;
3670	}
3671
3672	fnode_conn = iscsi_dev_to_flash_conn(dev);
3673
3674	err = transport->logout_flashnode(fnode_sess, fnode_conn);
3675	put_device(dev);
3676
3677	put_sess:
3678	put_device(dev: &fnode_sess->dev);
3679
3680	put_host:
3681	scsi_host_put(t: shost);
3682
3683	exit_logout_fnode:
3684	return err;
3685	}
3686
3687	static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3688	struct iscsi_uevent *ev)
3689	{
3690	struct Scsi_Host *shost;
3691	struct iscsi_cls_session *session;
3692	int err = 0;
3693
3694	if (!transport->logout_flashnode_sid) {
3695	err = -ENOSYS;
3696	goto exit_logout_sid;
3697	}
3698
3699	shost = scsi_host_lookup(hostnum: ev->u.logout_flashnode_sid.host_no);
3700	if (!shost) {
3701	pr_err("%s could not find host no %u\n",
3702	__func__, ev->u.logout_flashnode.host_no);
3703	err = -ENODEV;
3704	goto put_host;
3705	}
3706
3707	session = iscsi_session_lookup(sid: ev->u.logout_flashnode_sid.sid);
3708	if (!session) {
3709	pr_err("%s could not find session id %u\n",
3710	__func__, ev->u.logout_flashnode_sid.sid);
3711	err = -EINVAL;
3712	goto put_host;
3713	}
3714
3715	err = transport->logout_flashnode_sid(session);
3716
3717	put_host:
3718	scsi_host_put(t: shost);
3719
3720	exit_logout_sid:
3721	return err;
3722	}
3723
3724	static int
3725	iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3726	{
3727	struct iscsi_uevent *ev = nlmsg_data(nlh);
3728	struct Scsi_Host *shost = NULL;
3729	struct iscsi_internal *priv;
3730	struct sk_buff *skbhost_stats;
3731	struct nlmsghdr *nlhhost_stats;
3732	struct iscsi_uevent *evhost_stats;
3733	int host_stats_size = 0;
3734	int len, err = 0;
3735	char *buf;
3736
3737	if (!transport->get_host_stats)
3738	return -ENOSYS;
3739
3740	priv = iscsi_if_transport_lookup(tt: transport);
3741	if (!priv)
3742	return -EINVAL;
3743
3744	host_stats_size = sizeof(struct iscsi_offload_host_stats);
3745	len = nlmsg_total_size(payload: sizeof(*ev) + host_stats_size);
3746
3747	shost = scsi_host_lookup(hostnum: ev->u.get_host_stats.host_no);
3748	if (!shost) {
3749	pr_err("%s: failed. Could not find host no %u\n",
3750	__func__, ev->u.get_host_stats.host_no);
3751	return -ENODEV;
3752	}
3753
3754	do {
3755	int actual_size;
3756
3757	skbhost_stats = alloc_skb(size: len, GFP_KERNEL);
3758	if (!skbhost_stats) {
3759	pr_err("cannot deliver host stats: OOM\n");
3760	err = -ENOMEM;
3761	goto exit_host_stats;
3762	}
3763
3764	nlhhost_stats = __nlmsg_put(skb: skbhost_stats, portid: 0, seq: 0, type: 0,
3765	len: (len - sizeof(*nlhhost_stats)), flags: 0);
3766	evhost_stats = nlmsg_data(nlh: nlhhost_stats);
3767	memset(evhost_stats, 0, sizeof(*evhost_stats));
3768	evhost_stats->transport_handle = iscsi_handle(transport);
3769	evhost_stats->type = nlh->nlmsg_type;
3770	evhost_stats->u.get_host_stats.host_no =
3771	ev->u.get_host_stats.host_no;
3772	buf = (char *)evhost_stats + sizeof(*evhost_stats);
3773	memset(buf, 0, host_stats_size);
3774
3775	err = transport->get_host_stats(shost, buf, host_stats_size);
3776	if (err) {
3777	kfree_skb(skb: skbhost_stats);
3778	goto exit_host_stats;
3779	}
3780
3781	actual_size = nlmsg_total_size(payload: sizeof(*ev) + host_stats_size);
3782	skb_trim(skb: skbhost_stats, NLMSG_ALIGN(actual_size));
3783	nlhhost_stats->nlmsg_len = actual_size;
3784
3785	err = iscsi_multicast_skb(skb: skbhost_stats, ISCSI_NL_GRP_ISCSID,
3786	GFP_KERNEL);
3787	} while (err < 0 && err != -ECONNREFUSED);
3788
3789	exit_host_stats:
3790	scsi_host_put(t: shost);
3791	return err;
3792	}
3793
3794	static int iscsi_if_transport_conn(struct iscsi_transport *transport,
3795	struct nlmsghdr *nlh, u32 pdu_len)
3796	{
3797	struct iscsi_uevent *ev = nlmsg_data(nlh);
3798	struct iscsi_cls_session *session;
3799	struct iscsi_cls_conn *conn = NULL;
3800	struct iscsi_endpoint *ep;
3801	int err = 0;
3802
3803	switch (nlh->nlmsg_type) {
3804	case ISCSI_UEVENT_CREATE_CONN:
3805	return iscsi_if_create_conn(transport, ev);
3806	case ISCSI_UEVENT_DESTROY_CONN:
3807	return iscsi_if_destroy_conn(transport, ev);
3808	case ISCSI_UEVENT_STOP_CONN:
3809	conn = iscsi_conn_lookup(sid: ev->u.stop_conn.sid,
3810	cid: ev->u.stop_conn.cid);
3811	if (!conn)
3812	return -EINVAL;
3813
3814	return iscsi_if_stop_conn(conn, flag: ev->u.stop_conn.flag);
3815	}
3816
3817	/*
3818	* The following cmds need to be run under the ep_mutex so in kernel
3819	* conn cleanup (ep_disconnect + unbind and conn) is not done while
3820	* these are running. They also must not run if we have just run a conn
3821	* cleanup because they would set the state in a way that might allow
3822	* IO or send IO themselves.
3823	*/
3824	switch (nlh->nlmsg_type) {
3825	case ISCSI_UEVENT_START_CONN:
3826	conn = iscsi_conn_lookup(sid: ev->u.start_conn.sid,
3827	cid: ev->u.start_conn.cid);
3828	break;
3829	case ISCSI_UEVENT_BIND_CONN:
3830	conn = iscsi_conn_lookup(sid: ev->u.b_conn.sid, cid: ev->u.b_conn.cid);
3831	break;
3832	case ISCSI_UEVENT_SEND_PDU:
3833	conn = iscsi_conn_lookup(sid: ev->u.send_pdu.sid, cid: ev->u.send_pdu.cid);
3834	break;
3835	}
3836
3837	if (!conn)
3838	return -EINVAL;
3839
3840	mutex_lock(&conn->ep_mutex);
3841	spin_lock_irq(lock: &conn->lock);
3842	if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3843	spin_unlock_irq(lock: &conn->lock);
3844	mutex_unlock(lock: &conn->ep_mutex);
3845	ev->r.retcode = -ENOTCONN;
3846	return 0;
3847	}
3848	spin_unlock_irq(lock: &conn->lock);
3849
3850	switch (nlh->nlmsg_type) {
3851	case ISCSI_UEVENT_BIND_CONN:
3852	session = iscsi_session_lookup(sid: ev->u.b_conn.sid);
3853	if (!session) {
3854	err = -EINVAL;
3855	break;
3856	}
3857
3858	ev->r.retcode = transport->bind_conn(session, conn,
3859	ev->u.b_conn.transport_eph,
3860	ev->u.b_conn.is_leading);
3861	if (!ev->r.retcode)
3862	WRITE_ONCE(conn->state, ISCSI_CONN_BOUND);
3863
3864	if (ev->r.retcode || !transport->ep_connect)
3865	break;
3866
3867	ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3868	if (ep) {
3869	ep->conn = conn;
3870	conn->ep = ep;
3871	iscsi_put_endpoint(ep);
3872	} else {
3873	err = -ENOTCONN;
3874	iscsi_cls_conn_printk(KERN_ERR, conn,
3875	"Could not set ep conn binding\n");
3876	}
3877	break;
3878	case ISCSI_UEVENT_START_CONN:
3879	ev->r.retcode = transport->start_conn(conn);
3880	if (!ev->r.retcode)
3881	WRITE_ONCE(conn->state, ISCSI_CONN_UP);
3882
3883	break;
3884	case ISCSI_UEVENT_SEND_PDU:
3885	if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3886	(ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3887	err = -EINVAL;
3888	break;
3889	}
3890
3891	ev->r.retcode = transport->send_pdu(conn,
3892	(struct iscsi_hdr *)((char *)ev + sizeof(*ev)),
3893	(char *)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3894	ev->u.send_pdu.data_size);
3895	break;
3896	default:
3897	err = -ENOSYS;
3898	}
3899
3900	mutex_unlock(lock: &conn->ep_mutex);
3901	return err;
3902	}
3903
3904	static int
3905	iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3906	{
3907	int err = 0;
3908	u32 portid;
3909	struct iscsi_uevent *ev = nlmsg_data(nlh);
3910	struct iscsi_transport *transport = NULL;
3911	struct iscsi_internal *priv;
3912	struct iscsi_cls_session *session;
3913	struct iscsi_endpoint *ep = NULL;
3914	u32 rlen;
3915
3916	if (!netlink_capable(skb, CAP_SYS_ADMIN))
3917	return -EPERM;
3918
3919	if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3920	*group = ISCSI_NL_GRP_UIP;
3921	else
3922	*group = ISCSI_NL_GRP_ISCSID;
3923
3924	priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3925	if (!priv)
3926	return -EINVAL;
3927	transport = priv->iscsi_transport;
3928
3929	if (!try_module_get(module: transport->owner))
3930	return -EINVAL;
3931
3932	portid = NETLINK_CB(skb).portid;
3933
3934	/*
3935	* Even though the remaining payload may not be regarded as nlattr,
3936	* (like address or something else), calculate the remaining length
3937	* here to ease following length checks.
3938	*/
3939	rlen = nlmsg_attrlen(nlh, hdrlen: sizeof(*ev));
3940
3941	switch (nlh->nlmsg_type) {
3942	case ISCSI_UEVENT_CREATE_SESSION:
3943	err = iscsi_if_create_session(priv, ep, ev,
3944	pid: portid,
3945	initial_cmdsn: ev->u.c_session.initial_cmdsn,
3946	cmds_max: ev->u.c_session.cmds_max,
3947	queue_depth: ev->u.c_session.queue_depth);
3948	break;
3949	case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3950	ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3951	if (!ep) {
3952	err = -EINVAL;
3953	break;
3954	}
3955
3956	err = iscsi_if_create_session(priv, ep, ev,
3957	pid: portid,
3958	initial_cmdsn: ev->u.c_bound_session.initial_cmdsn,
3959	cmds_max: ev->u.c_bound_session.cmds_max,
3960	queue_depth: ev->u.c_bound_session.queue_depth);
3961	iscsi_put_endpoint(ep);
3962	break;
3963	case ISCSI_UEVENT_DESTROY_SESSION:
3964	session = iscsi_session_lookup(sid: ev->u.d_session.sid);
3965	if (!session)
3966	err = -EINVAL;
3967	else if (iscsi_session_has_conns(sid: ev->u.d_session.sid))
3968	err = -EBUSY;
3969	else
3970	transport->destroy_session(session);
3971	break;
3972	case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3973	session = iscsi_session_lookup(sid: ev->u.d_session.sid);
3974	if (!session)
3975	err = -EINVAL;
3976	else if (iscsi_session_has_conns(sid: ev->u.d_session.sid))
3977	err = -EBUSY;
3978	else {
3979	unsigned long flags;
3980
3981	/* Prevent this session from being found again */
3982	spin_lock_irqsave(&sesslock, flags);
3983	list_del_init(entry: &session->sess_list);
3984	spin_unlock_irqrestore(lock: &sesslock, flags);
3985
3986	queue_work(wq: system_unbound_wq, work: &session->destroy_work);
3987	}
3988	break;
3989	case ISCSI_UEVENT_UNBIND_SESSION:
3990	session = iscsi_session_lookup(sid: ev->u.d_session.sid);
3991	if (session)
3992	queue_work(wq: session->workq, work: &session->unbind_work);
3993	else
3994	err = -EINVAL;
3995	break;
3996	case ISCSI_UEVENT_SET_PARAM:
3997	err = iscsi_if_set_param(transport, ev, rlen);
3998	break;
3999	case ISCSI_UEVENT_CREATE_CONN:
4000	case ISCSI_UEVENT_DESTROY_CONN:
4001	case ISCSI_UEVENT_STOP_CONN:
4002	case ISCSI_UEVENT_START_CONN:
4003	case ISCSI_UEVENT_BIND_CONN:
4004	case ISCSI_UEVENT_SEND_PDU:
4005	err = iscsi_if_transport_conn(transport, nlh, pdu_len: rlen);
4006	break;
4007	case ISCSI_UEVENT_GET_STATS:
4008	err = iscsi_if_get_stats(transport, nlh);
4009	break;
4010	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
4011	case ISCSI_UEVENT_TRANSPORT_EP_POLL:
4012	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
4013	case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
4014	err = iscsi_if_transport_ep(transport, ev, msg_type: nlh->nlmsg_type, rlen);
4015	break;
4016	case ISCSI_UEVENT_TGT_DSCVR:
4017	err = iscsi_tgt_dscvr(transport, ev, rlen);
4018	break;
4019	case ISCSI_UEVENT_SET_HOST_PARAM:
4020	err = iscsi_set_host_param(transport, ev, rlen);
4021	break;
4022	case ISCSI_UEVENT_PATH_UPDATE:
4023	err = iscsi_set_path(transport, ev, rlen);
4024	break;
4025	case ISCSI_UEVENT_SET_IFACE_PARAMS:
4026	err = iscsi_set_iface_params(transport, ev, len: rlen);
4027	break;
4028	case ISCSI_UEVENT_PING:
4029	err = iscsi_send_ping(transport, ev, rlen);
4030	break;
4031	case ISCSI_UEVENT_GET_CHAP:
4032	err = iscsi_get_chap(transport, nlh);
4033	break;
4034	case ISCSI_UEVENT_DELETE_CHAP:
4035	err = iscsi_delete_chap(transport, ev);
4036	break;
4037	case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
4038	err = iscsi_set_flashnode_param(transport, ev, len: rlen);
4039	break;
4040	case ISCSI_UEVENT_NEW_FLASHNODE:
4041	err = iscsi_new_flashnode(transport, ev, len: rlen);
4042	break;
4043	case ISCSI_UEVENT_DEL_FLASHNODE:
4044	err = iscsi_del_flashnode(transport, ev);
4045	break;
4046	case ISCSI_UEVENT_LOGIN_FLASHNODE:
4047	err = iscsi_login_flashnode(transport, ev);
4048	break;
4049	case ISCSI_UEVENT_LOGOUT_FLASHNODE:
4050	err = iscsi_logout_flashnode(transport, ev);
4051	break;
4052	case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
4053	err = iscsi_logout_flashnode_sid(transport, ev);
4054	break;
4055	case ISCSI_UEVENT_SET_CHAP:
4056	err = iscsi_set_chap(transport, ev, len: rlen);
4057	break;
4058	case ISCSI_UEVENT_GET_HOST_STATS:
4059	err = iscsi_get_host_stats(transport, nlh);
4060	break;
4061	default:
4062	err = -ENOSYS;
4063	break;
4064	}
4065
4066	module_put(module: transport->owner);
4067	return err;
4068	}
4069
4070	/*
4071	* Get message from skb. Each message is processed by iscsi_if_recv_msg.
4072	* Malformed skbs with wrong lengths or invalid creds are not processed.
4073	*/
4074	static void
4075	iscsi_if_rx(struct sk_buff *skb)
4076	{
4077	u32 portid = NETLINK_CB(skb).portid;
4078
4079	mutex_lock(&rx_queue_mutex);
4080	while (skb->len >= NLMSG_HDRLEN) {
4081	int err;
4082	uint32_t rlen;
4083	struct nlmsghdr *nlh;
4084	struct iscsi_uevent *ev;
4085	uint32_t group;
4086	int retries = ISCSI_SEND_MAX_ALLOWED;
4087
4088	nlh = nlmsg_hdr(skb);
4089	if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
4090	skb->len < nlh->nlmsg_len) {
4091	break;
4092	}
4093
4094	ev = nlmsg_data(nlh);
4095	rlen = NLMSG_ALIGN(nlh->nlmsg_len);
4096	if (rlen > skb->len)
4097	rlen = skb->len;
4098
4099	err = iscsi_if_recv_msg(skb, nlh, group: &group);
4100	if (err) {
4101	ev->type = ISCSI_KEVENT_IF_ERROR;
4102	ev->iferror = err;
4103	}
4104	do {
4105	/*
4106	* special case for GET_STATS:
4107	* on success - sending reply and stats from
4108	* inside of if_recv_msg(),
4109	* on error - fall through.
4110	*/
4111	if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
4112	break;
4113	if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
4114	break;
4115	err = iscsi_if_send_reply(portid, type: nlh->nlmsg_type,
4116	payload: ev, size: sizeof(*ev));
4117	if (err == -EAGAIN && --retries < 0) {
4118	printk(KERN_WARNING "Send reply failed, error %d\n", err);
4119	break;
4120	}
4121	} while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
4122	skb_pull(skb, len: rlen);
4123	}
4124	mutex_unlock(lock: &rx_queue_mutex);
4125	}
4126
4127	#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
4128	struct device_attribute dev_attr_##_prefix##_##_name = \
4129	__ATTR(_name,_mode,_show,_store)
4130
4131	/*
4132	* iSCSI connection attrs
4133	*/
4134	#define iscsi_conn_attr_show(param) \
4135	static ssize_t \
4136	show_conn_param_##param(struct device *dev, \
4137	struct device_attribute *attr, char *buf) \
4138	{ \
4139	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
4140	struct iscsi_transport *t = conn->transport; \
4141	return t->get_conn_param(conn, param, buf); \
4142	}
4143
4144	#define iscsi_conn_attr(field, param) \
4145	iscsi_conn_attr_show(param) \
4146	static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
4147	NULL);
4148
4149	iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
4150	iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
4151	iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
4152	iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
4153	iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
4154	iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
4155	iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
4156	iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
4157	iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
4158	iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
4159	iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
4160	iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
4161	iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
4162	iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
4163	iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
4164	iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
4165	iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
4166	iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
4167	iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
4168	iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
4169	iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
4170	iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
4171	iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
4172	iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
4173	iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
4174	iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
4175	iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
4176	iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
4177
4178	static const char *const connection_state_names[] = {
4179	[ISCSI_CONN_UP] = "up",
4180	[ISCSI_CONN_DOWN] = "down",
4181	[ISCSI_CONN_FAILED] = "failed",
4182	[ISCSI_CONN_BOUND] = "bound"
4183	};
4184
4185	static ssize_t show_conn_state(struct device *dev,
4186	struct device_attribute *attr, char *buf)
4187	{
4188	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
4189	const char *state = "unknown";
4190	int conn_state = READ_ONCE(conn->state);
4191
4192	if (conn_state >= 0 &&
4193	conn_state < ARRAY_SIZE(connection_state_names))
4194	state = connection_state_names[conn_state];
4195
4196	return sysfs_emit(buf, fmt: "%s\n", state);
4197	}
4198	static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
4199	NULL);
4200
4201	#define iscsi_conn_ep_attr_show(param) \
4202	static ssize_t show_conn_ep_param_##param(struct device *dev, \
4203	struct device_attribute *attr,\
4204	char *buf) \
4205	{ \
4206	struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
4207	struct iscsi_transport *t = conn->transport; \
4208	struct iscsi_endpoint *ep; \
4209	ssize_t rc; \
4210	\
4211	/* \
4212	* Need to make sure ep_disconnect does not free the LLD's \
4213	* interconnect resources while we are trying to read them. \
4214	*/ \
4215	mutex_lock(&conn->ep_mutex); \
4216	ep = conn->ep; \
4217	if (!ep && t->ep_connect) { \
4218	mutex_unlock(&conn->ep_mutex); \
4219	return -ENOTCONN; \
4220	} \
4221	\
4222	if (ep) \
4223	rc = t->get_ep_param(ep, param, buf); \
4224	else \
4225	rc = t->get_conn_param(conn, param, buf); \
4226	mutex_unlock(&conn->ep_mutex); \
4227	return rc; \
4228	}
4229
4230	#define iscsi_conn_ep_attr(field, param) \
4231	iscsi_conn_ep_attr_show(param) \
4232	static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
4233	show_conn_ep_param_##param, NULL);
4234
4235	iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4236	iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4237
4238	static struct attribute *iscsi_conn_attrs[] = {
4239	&dev_attr_conn_max_recv_dlength.attr,
4240	&dev_attr_conn_max_xmit_dlength.attr,
4241	&dev_attr_conn_header_digest.attr,
4242	&dev_attr_conn_data_digest.attr,
4243	&dev_attr_conn_ifmarker.attr,
4244	&dev_attr_conn_ofmarker.attr,
4245	&dev_attr_conn_address.attr,
4246	&dev_attr_conn_port.attr,
4247	&dev_attr_conn_exp_statsn.attr,
4248	&dev_attr_conn_persistent_address.attr,
4249	&dev_attr_conn_persistent_port.attr,
4250	&dev_attr_conn_ping_tmo.attr,
4251	&dev_attr_conn_recv_tmo.attr,
4252	&dev_attr_conn_local_port.attr,
4253	&dev_attr_conn_statsn.attr,
4254	&dev_attr_conn_keepalive_tmo.attr,
4255	&dev_attr_conn_max_segment_size.attr,
4256	&dev_attr_conn_tcp_timestamp_stat.attr,
4257	&dev_attr_conn_tcp_wsf_disable.attr,
4258	&dev_attr_conn_tcp_nagle_disable.attr,
4259	&dev_attr_conn_tcp_timer_scale.attr,
4260	&dev_attr_conn_tcp_timestamp_enable.attr,
4261	&dev_attr_conn_fragment_disable.attr,
4262	&dev_attr_conn_ipv4_tos.attr,
4263	&dev_attr_conn_ipv6_traffic_class.attr,
4264	&dev_attr_conn_ipv6_flow_label.attr,
4265	&dev_attr_conn_is_fw_assigned_ipv6.attr,
4266	&dev_attr_conn_tcp_xmit_wsf.attr,
4267	&dev_attr_conn_tcp_recv_wsf.attr,
4268	&dev_attr_conn_local_ipaddr.attr,
4269	&dev_attr_conn_state.attr,
4270	NULL,
4271	};
4272
4273	static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4274	struct attribute *attr, int i)
4275	{
4276	struct device *cdev = container_of(kobj, struct device, kobj);
4277	struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4278	struct iscsi_transport *t = conn->transport;
4279	int param;
4280
4281	if (attr == &dev_attr_conn_max_recv_dlength.attr)
4282	param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4283	else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4284	param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4285	else if (attr == &dev_attr_conn_header_digest.attr)
4286	param = ISCSI_PARAM_HDRDGST_EN;
4287	else if (attr == &dev_attr_conn_data_digest.attr)
4288	param = ISCSI_PARAM_DATADGST_EN;
4289	else if (attr == &dev_attr_conn_ifmarker.attr)
4290	param = ISCSI_PARAM_IFMARKER_EN;
4291	else if (attr == &dev_attr_conn_ofmarker.attr)
4292	param = ISCSI_PARAM_OFMARKER_EN;
4293	else if (attr == &dev_attr_conn_address.attr)
4294	param = ISCSI_PARAM_CONN_ADDRESS;
4295	else if (attr == &dev_attr_conn_port.attr)
4296	param = ISCSI_PARAM_CONN_PORT;
4297	else if (attr == &dev_attr_conn_exp_statsn.attr)
4298	param = ISCSI_PARAM_EXP_STATSN;
4299	else if (attr == &dev_attr_conn_persistent_address.attr)
4300	param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4301	else if (attr == &dev_attr_conn_persistent_port.attr)
4302	param = ISCSI_PARAM_PERSISTENT_PORT;
4303	else if (attr == &dev_attr_conn_ping_tmo.attr)
4304	param = ISCSI_PARAM_PING_TMO;
4305	else if (attr == &dev_attr_conn_recv_tmo.attr)
4306	param = ISCSI_PARAM_RECV_TMO;
4307	else if (attr == &dev_attr_conn_local_port.attr)
4308	param = ISCSI_PARAM_LOCAL_PORT;
4309	else if (attr == &dev_attr_conn_statsn.attr)
4310	param = ISCSI_PARAM_STATSN;
4311	else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4312	param = ISCSI_PARAM_KEEPALIVE_TMO;
4313	else if (attr == &dev_attr_conn_max_segment_size.attr)
4314	param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4315	else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4316	param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4317	else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4318	param = ISCSI_PARAM_TCP_WSF_DISABLE;
4319	else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4320	param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4321	else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4322	param = ISCSI_PARAM_TCP_TIMER_SCALE;
4323	else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4324	param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4325	else if (attr == &dev_attr_conn_fragment_disable.attr)
4326	param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4327	else if (attr == &dev_attr_conn_ipv4_tos.attr)
4328	param = ISCSI_PARAM_IPV4_TOS;
4329	else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4330	param = ISCSI_PARAM_IPV6_TC;
4331	else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4332	param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4333	else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4334	param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4335	else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4336	param = ISCSI_PARAM_TCP_XMIT_WSF;
4337	else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4338	param = ISCSI_PARAM_TCP_RECV_WSF;
4339	else if (attr == &dev_attr_conn_local_ipaddr.attr)
4340	param = ISCSI_PARAM_LOCAL_IPADDR;
4341	else if (attr == &dev_attr_conn_state.attr)
4342	return S_IRUGO;
4343	else {
4344	WARN_ONCE(1, "Invalid conn attr");
4345	return 0;
4346	}
4347
4348	return t->attr_is_visible(ISCSI_PARAM, param);
4349	}
4350
4351	static struct attribute_group iscsi_conn_group = {
4352	.attrs = iscsi_conn_attrs,
4353	.is_visible = iscsi_conn_attr_is_visible,
4354	};
4355
4356	/*
4357	* iSCSI session attrs
4358	*/
4359	#define iscsi_session_attr_show(param, perm) \
4360	static ssize_t \
4361	show_session_param_##param(struct device *dev, \
4362	struct device_attribute *attr, char *buf) \
4363	{ \
4364	struct iscsi_cls_session *session = \
4365	iscsi_dev_to_session(dev->parent); \
4366	struct iscsi_transport *t = session->transport; \
4367	\
4368	if (perm && !capable(CAP_SYS_ADMIN)) \
4369	return -EACCES; \
4370	return t->get_session_param(session, param, buf); \
4371	}
4372
4373	#define iscsi_session_attr(field, param, perm) \
4374	iscsi_session_attr_show(param, perm) \
4375	static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4376	NULL);
4377	iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4378	iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4379	iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4380	iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4381	iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4382	iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4383	iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4384	iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4385	iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4386	iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4387	iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4388	iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4389	iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4390	iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4391	iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4392	iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4393	iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4394	iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4395	iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4396	iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4397	iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4398	iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4399	iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4400	iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4401	iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4402	iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4403	iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4404	iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4405	iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4406	iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4407	iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4408	iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4409	iscsi_session_attr(discovery_auth_optional,
4410	ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4411	iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4412	iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4413	iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4414	iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4415	iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4416	iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4417	iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4418
4419	static ssize_t
4420	show_priv_session_target_state(struct device *dev, struct device_attribute *attr,
4421	char *buf)
4422	{
4423	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4424
4425	return sysfs_emit(buf, fmt: "%s\n",
4426	iscsi_session_target_state_name[session->target_state]);
4427	}
4428
4429	static ISCSI_CLASS_ATTR(priv_sess, target_state, S_IRUGO,
4430	show_priv_session_target_state, NULL);
4431
4432	static ssize_t
4433	show_priv_session_state(struct device *dev, struct device_attribute *attr,
4434	char *buf)
4435	{
4436	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4437	return sysfs_emit(buf, fmt: "%s\n", iscsi_session_state_name(state: session->state));
4438	}
4439	static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4440	NULL);
4441	static ssize_t
4442	show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4443	char *buf)
4444	{
4445	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4446	return sysfs_emit(buf, fmt: "%d\n", session->creator);
4447	}
4448	static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4449	NULL);
4450	static ssize_t
4451	show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4452	char *buf)
4453	{
4454	struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4455	return sysfs_emit(buf, fmt: "%d\n", session->target_id);
4456	}
4457	static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4458	show_priv_session_target_id, NULL);
4459
4460	#define iscsi_priv_session_attr_show(field, format) \
4461	static ssize_t \
4462	show_priv_session_##field(struct device *dev, \
4463	struct device_attribute *attr, char *buf) \
4464	{ \
4465	struct iscsi_cls_session *session = \
4466	iscsi_dev_to_session(dev->parent); \
4467	if (session->field == -1) \
4468	return sysfs_emit(buf, "off\n"); \
4469	return sysfs_emit(buf, format"\n", session->field); \
4470	}
4471
4472	#define iscsi_priv_session_attr_store(field) \
4473	static ssize_t \
4474	store_priv_session_##field(struct device *dev, \
4475	struct device_attribute *attr, \
4476	const char *buf, size_t count) \
4477	{ \
4478	int val; \
4479	char *cp; \
4480	struct iscsi_cls_session *session = \
4481	iscsi_dev_to_session(dev->parent); \
4482	if ((session->state == ISCSI_SESSION_FREE) || \
4483	(session->state == ISCSI_SESSION_FAILED)) \
4484	return -EBUSY; \
4485	if (strncmp(buf, "off", 3) == 0) { \
4486	session->field = -1; \
4487	session->field##_sysfs_override = true; \
4488	} else { \
4489	val = simple_strtoul(buf, &cp, 0); \
4490	if (*cp != '\0' && *cp != '\n') \
4491	return -EINVAL; \
4492	session->field = val; \
4493	session->field##_sysfs_override = true; \
4494	} \
4495	return count; \
4496	}
4497
4498	#define iscsi_priv_session_rw_attr(field, format) \
4499	iscsi_priv_session_attr_show(field, format) \
4500	iscsi_priv_session_attr_store(field) \
4501	static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
4502	show_priv_session_##field, \
4503	store_priv_session_##field)
4504
4505	iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4506
4507	static struct attribute *iscsi_session_attrs[] = {
4508	&dev_attr_sess_initial_r2t.attr,
4509	&dev_attr_sess_max_outstanding_r2t.attr,
4510	&dev_attr_sess_immediate_data.attr,
4511	&dev_attr_sess_first_burst_len.attr,
4512	&dev_attr_sess_max_burst_len.attr,
4513	&dev_attr_sess_data_pdu_in_order.attr,
4514	&dev_attr_sess_data_seq_in_order.attr,
4515	&dev_attr_sess_erl.attr,
4516	&dev_attr_sess_targetname.attr,
4517	&dev_attr_sess_tpgt.attr,
4518	&dev_attr_sess_password.attr,
4519	&dev_attr_sess_password_in.attr,
4520	&dev_attr_sess_username.attr,
4521	&dev_attr_sess_username_in.attr,
4522	&dev_attr_sess_fast_abort.attr,
4523	&dev_attr_sess_abort_tmo.attr,
4524	&dev_attr_sess_lu_reset_tmo.attr,
4525	&dev_attr_sess_tgt_reset_tmo.attr,
4526	&dev_attr_sess_ifacename.attr,
4527	&dev_attr_sess_initiatorname.attr,
4528	&dev_attr_sess_targetalias.attr,
4529	&dev_attr_sess_boot_root.attr,
4530	&dev_attr_sess_boot_nic.attr,
4531	&dev_attr_sess_boot_target.attr,
4532	&dev_attr_priv_sess_recovery_tmo.attr,
4533	&dev_attr_priv_sess_state.attr,
4534	&dev_attr_priv_sess_target_state.attr,
4535	&dev_attr_priv_sess_creator.attr,
4536	&dev_attr_sess_chap_out_idx.attr,
4537	&dev_attr_sess_chap_in_idx.attr,
4538	&dev_attr_priv_sess_target_id.attr,
4539	&dev_attr_sess_auto_snd_tgt_disable.attr,
4540	&dev_attr_sess_discovery_session.attr,
4541	&dev_attr_sess_portal_type.attr,
4542	&dev_attr_sess_chap_auth.attr,
4543	&dev_attr_sess_discovery_logout.attr,
4544	&dev_attr_sess_bidi_chap.attr,
4545	&dev_attr_sess_discovery_auth_optional.attr,
4546	&dev_attr_sess_def_time2wait.attr,
4547	&dev_attr_sess_def_time2retain.attr,
4548	&dev_attr_sess_isid.attr,
4549	&dev_attr_sess_tsid.attr,
4550	&dev_attr_sess_def_taskmgmt_tmo.attr,
4551	&dev_attr_sess_discovery_parent_idx.attr,
4552	&dev_attr_sess_discovery_parent_type.attr,
4553	NULL,
4554	};
4555
4556	static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4557	struct attribute *attr, int i)
4558	{
4559	struct device *cdev = container_of(kobj, struct device, kobj);
4560	struct iscsi_cls_session *session = transport_class_to_session(cdev);
4561	struct iscsi_transport *t = session->transport;
4562	int param;
4563
4564	if (attr == &dev_attr_sess_initial_r2t.attr)
4565	param = ISCSI_PARAM_INITIAL_R2T_EN;
4566	else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4567	param = ISCSI_PARAM_MAX_R2T;
4568	else if (attr == &dev_attr_sess_immediate_data.attr)
4569	param = ISCSI_PARAM_IMM_DATA_EN;
4570	else if (attr == &dev_attr_sess_first_burst_len.attr)
4571	param = ISCSI_PARAM_FIRST_BURST;
4572	else if (attr == &dev_attr_sess_max_burst_len.attr)
4573	param = ISCSI_PARAM_MAX_BURST;
4574	else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4575	param = ISCSI_PARAM_PDU_INORDER_EN;
4576	else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4577	param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4578	else if (attr == &dev_attr_sess_erl.attr)
4579	param = ISCSI_PARAM_ERL;
4580	else if (attr == &dev_attr_sess_targetname.attr)
4581	param = ISCSI_PARAM_TARGET_NAME;
4582	else if (attr == &dev_attr_sess_tpgt.attr)
4583	param = ISCSI_PARAM_TPGT;
4584	else if (attr == &dev_attr_sess_chap_in_idx.attr)
4585	param = ISCSI_PARAM_CHAP_IN_IDX;
4586	else if (attr == &dev_attr_sess_chap_out_idx.attr)
4587	param = ISCSI_PARAM_CHAP_OUT_IDX;
4588	else if (attr == &dev_attr_sess_password.attr)
4589	param = ISCSI_PARAM_USERNAME;
4590	else if (attr == &dev_attr_sess_password_in.attr)
4591	param = ISCSI_PARAM_USERNAME_IN;
4592	else if (attr == &dev_attr_sess_username.attr)
4593	param = ISCSI_PARAM_PASSWORD;
4594	else if (attr == &dev_attr_sess_username_in.attr)
4595	param = ISCSI_PARAM_PASSWORD_IN;
4596	else if (attr == &dev_attr_sess_fast_abort.attr)
4597	param = ISCSI_PARAM_FAST_ABORT;
4598	else if (attr == &dev_attr_sess_abort_tmo.attr)
4599	param = ISCSI_PARAM_ABORT_TMO;
4600	else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4601	param = ISCSI_PARAM_LU_RESET_TMO;
4602	else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4603	param = ISCSI_PARAM_TGT_RESET_TMO;
4604	else if (attr == &dev_attr_sess_ifacename.attr)
4605	param = ISCSI_PARAM_IFACE_NAME;
4606	else if (attr == &dev_attr_sess_initiatorname.attr)
4607	param = ISCSI_PARAM_INITIATOR_NAME;
4608	else if (attr == &dev_attr_sess_targetalias.attr)
4609	param = ISCSI_PARAM_TARGET_ALIAS;
4610	else if (attr == &dev_attr_sess_boot_root.attr)
4611	param = ISCSI_PARAM_BOOT_ROOT;
4612	else if (attr == &dev_attr_sess_boot_nic.attr)
4613	param = ISCSI_PARAM_BOOT_NIC;
4614	else if (attr == &dev_attr_sess_boot_target.attr)
4615	param = ISCSI_PARAM_BOOT_TARGET;
4616	else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4617	param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4618	else if (attr == &dev_attr_sess_discovery_session.attr)
4619	param = ISCSI_PARAM_DISCOVERY_SESS;
4620	else if (attr == &dev_attr_sess_portal_type.attr)
4621	param = ISCSI_PARAM_PORTAL_TYPE;
4622	else if (attr == &dev_attr_sess_chap_auth.attr)
4623	param = ISCSI_PARAM_CHAP_AUTH_EN;
4624	else if (attr == &dev_attr_sess_discovery_logout.attr)
4625	param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4626	else if (attr == &dev_attr_sess_bidi_chap.attr)
4627	param = ISCSI_PARAM_BIDI_CHAP_EN;
4628	else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4629	param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4630	else if (attr == &dev_attr_sess_def_time2wait.attr)
4631	param = ISCSI_PARAM_DEF_TIME2WAIT;
4632	else if (attr == &dev_attr_sess_def_time2retain.attr)
4633	param = ISCSI_PARAM_DEF_TIME2RETAIN;
4634	else if (attr == &dev_attr_sess_isid.attr)
4635	param = ISCSI_PARAM_ISID;
4636	else if (attr == &dev_attr_sess_tsid.attr)
4637	param = ISCSI_PARAM_TSID;
4638	else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4639	param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4640	else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4641	param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4642	else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4643	param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4644	else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4645	return S_IRUGO | S_IWUSR;
4646	else if (attr == &dev_attr_priv_sess_state.attr)
4647	return S_IRUGO;
4648	else if (attr == &dev_attr_priv_sess_target_state.attr)
4649	return S_IRUGO;
4650	else if (attr == &dev_attr_priv_sess_creator.attr)
4651	return S_IRUGO;
4652	else if (attr == &dev_attr_priv_sess_target_id.attr)
4653	return S_IRUGO;
4654	else {
4655	WARN_ONCE(1, "Invalid session attr");
4656	return 0;
4657	}
4658
4659	return t->attr_is_visible(ISCSI_PARAM, param);
4660	}
4661
4662	static struct attribute_group iscsi_session_group = {
4663	.attrs = iscsi_session_attrs,
4664	.is_visible = iscsi_session_attr_is_visible,
4665	};
4666
4667	/*
4668	* iSCSI host attrs
4669	*/
4670	#define iscsi_host_attr_show(param) \
4671	static ssize_t \
4672	show_host_param_##param(struct device *dev, \
4673	struct device_attribute *attr, char *buf) \
4674	{ \
4675	struct Scsi_Host *shost = transport_class_to_shost(dev); \
4676	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4677	return priv->iscsi_transport->get_host_param(shost, param, buf); \
4678	}
4679
4680	#define iscsi_host_attr(field, param) \
4681	iscsi_host_attr_show(param) \
4682	static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
4683	NULL);
4684
4685	iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4686	iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4687	iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4688	iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4689	iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4690	iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4691
4692	static struct attribute *iscsi_host_attrs[] = {
4693	&dev_attr_host_netdev.attr,
4694	&dev_attr_host_hwaddress.attr,
4695	&dev_attr_host_ipaddress.attr,
4696	&dev_attr_host_initiatorname.attr,
4697	&dev_attr_host_port_state.attr,
4698	&dev_attr_host_port_speed.attr,
4699	NULL,
4700	};
4701
4702	static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4703	struct attribute *attr, int i)
4704	{
4705	struct device *cdev = container_of(kobj, struct device, kobj);
4706	struct Scsi_Host *shost = transport_class_to_shost(cdev);
4707	struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4708	int param;
4709
4710	if (attr == &dev_attr_host_netdev.attr)
4711	param = ISCSI_HOST_PARAM_NETDEV_NAME;
4712	else if (attr == &dev_attr_host_hwaddress.attr)
4713	param = ISCSI_HOST_PARAM_HWADDRESS;
4714	else if (attr == &dev_attr_host_ipaddress.attr)
4715	param = ISCSI_HOST_PARAM_IPADDRESS;
4716	else if (attr == &dev_attr_host_initiatorname.attr)
4717	param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4718	else if (attr == &dev_attr_host_port_state.attr)
4719	param = ISCSI_HOST_PARAM_PORT_STATE;
4720	else if (attr == &dev_attr_host_port_speed.attr)
4721	param = ISCSI_HOST_PARAM_PORT_SPEED;
4722	else {
4723	WARN_ONCE(1, "Invalid host attr");
4724	return 0;
4725	}
4726
4727	return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4728	}
4729
4730	static struct attribute_group iscsi_host_group = {
4731	.attrs = iscsi_host_attrs,
4732	.is_visible = iscsi_host_attr_is_visible,
4733	};
4734
4735	/* convert iscsi_port_speed values to ascii string name */
4736	static const struct {
4737	enum iscsi_port_speed value;
4738	char *name;
4739	} iscsi_port_speed_names[] = {
4740	{ISCSI_PORT_SPEED_UNKNOWN, "Unknown" },
4741	{ISCSI_PORT_SPEED_10MBPS, "10 Mbps" },
4742	{ISCSI_PORT_SPEED_100MBPS, "100 Mbps" },
4743	{ISCSI_PORT_SPEED_1GBPS, "1 Gbps" },
4744	{ISCSI_PORT_SPEED_10GBPS, "10 Gbps" },
4745	{ISCSI_PORT_SPEED_25GBPS, "25 Gbps" },
4746	{ISCSI_PORT_SPEED_40GBPS, "40 Gbps" },
4747	};
4748
4749	char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4750	{
4751	int i;
4752	char *speed = "Unknown!";
4753	struct iscsi_cls_host *ihost = shost->shost_data;
4754	uint32_t port_speed = ihost->port_speed;
4755
4756	for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4757	if (iscsi_port_speed_names[i].value & port_speed) {
4758	speed = iscsi_port_speed_names[i].name;
4759	break;
4760	}
4761	}
4762	return speed;
4763	}
4764	EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4765
4766	/* convert iscsi_port_state values to ascii string name */
4767	static const struct {
4768	enum iscsi_port_state value;
4769	char *name;
4770	} iscsi_port_state_names[] = {
4771	{.value: ISCSI_PORT_STATE_DOWN, .name: "LINK DOWN" },
4772	{ISCSI_PORT_STATE_UP, "LINK UP" },
4773	};
4774
4775	char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4776	{
4777	int i;
4778	char *state = "Unknown!";
4779	struct iscsi_cls_host *ihost = shost->shost_data;
4780	uint32_t port_state = ihost->port_state;
4781
4782	for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4783	if (iscsi_port_state_names[i].value & port_state) {
4784	state = iscsi_port_state_names[i].name;
4785	break;
4786	}
4787	}
4788	return state;
4789	}
4790	EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4791
4792	static int iscsi_session_match(struct attribute_container *cont,
4793	struct device *dev)
4794	{
4795	struct iscsi_cls_session *session;
4796	struct Scsi_Host *shost;
4797	struct iscsi_internal *priv;
4798
4799	if (!iscsi_is_session_dev(dev))
4800	return 0;
4801
4802	session = iscsi_dev_to_session(dev);
4803	shost = iscsi_session_to_shost(session);
4804	if (!shost->transportt)
4805	return 0;
4806
4807	priv = to_iscsi_internal(shost->transportt);
4808	if (priv->session_cont.ac.class != &iscsi_session_class.class)
4809	return 0;
4810
4811	return &priv->session_cont.ac == cont;
4812	}
4813
4814	static int iscsi_conn_match(struct attribute_container *cont,
4815	struct device *dev)
4816	{
4817	struct iscsi_cls_session *session;
4818	struct iscsi_cls_conn *conn;
4819	struct Scsi_Host *shost;
4820	struct iscsi_internal *priv;
4821
4822	if (!iscsi_is_conn_dev(dev))
4823	return 0;
4824
4825	conn = iscsi_dev_to_conn(dev);
4826	session = iscsi_dev_to_session(conn->dev.parent);
4827	shost = iscsi_session_to_shost(session);
4828
4829	if (!shost->transportt)
4830	return 0;
4831
4832	priv = to_iscsi_internal(shost->transportt);
4833	if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4834	return 0;
4835
4836	return &priv->conn_cont.ac == cont;
4837	}
4838
4839	static int iscsi_host_match(struct attribute_container *cont,
4840	struct device *dev)
4841	{
4842	struct Scsi_Host *shost;
4843	struct iscsi_internal *priv;
4844
4845	if (!scsi_is_host_device(dev))
4846	return 0;
4847
4848	shost = dev_to_shost(dev);
4849	if (!shost->transportt ||
4850	shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4851	return 0;
4852
4853	priv = to_iscsi_internal(shost->transportt);
4854	return &priv->t.host_attrs.ac == cont;
4855	}
4856
4857	struct scsi_transport_template *
4858	iscsi_register_transport(struct iscsi_transport *tt)
4859	{
4860	struct iscsi_internal *priv;
4861	unsigned long flags;
4862	int err;
4863
4864	BUG_ON(!tt);
4865	WARN_ON(tt->ep_disconnect && !tt->unbind_conn);
4866
4867	priv = iscsi_if_transport_lookup(tt);
4868	if (priv)
4869	return NULL;
4870
4871	priv = kzalloc(size: sizeof(*priv), GFP_KERNEL);
4872	if (!priv)
4873	return NULL;
4874	INIT_LIST_HEAD(list: &priv->list);
4875	priv->iscsi_transport = tt;
4876	priv->t.user_scan = iscsi_user_scan;
4877
4878	priv->dev.class = &iscsi_transport_class;
4879	dev_set_name(dev: &priv->dev, name: "%s", tt->name);
4880	err = device_register(dev: &priv->dev);
4881	if (err)
4882	goto put_dev;
4883
4884	err = sysfs_create_group(kobj: &priv->dev.kobj, grp: &iscsi_transport_group);
4885	if (err)
4886	goto unregister_dev;
4887
4888	/* host parameters */
4889	priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4890	priv->t.host_attrs.ac.match = iscsi_host_match;
4891	priv->t.host_attrs.ac.grp = &iscsi_host_group;
4892	priv->t.host_size = sizeof(struct iscsi_cls_host);
4893	transport_container_register(tc: &priv->t.host_attrs);
4894
4895	/* connection parameters */
4896	priv->conn_cont.ac.class = &iscsi_connection_class.class;
4897	priv->conn_cont.ac.match = iscsi_conn_match;
4898	priv->conn_cont.ac.grp = &iscsi_conn_group;
4899	transport_container_register(tc: &priv->conn_cont);
4900
4901	/* session parameters */
4902	priv->session_cont.ac.class = &iscsi_session_class.class;
4903	priv->session_cont.ac.match = iscsi_session_match;
4904	priv->session_cont.ac.grp = &iscsi_session_group;
4905	transport_container_register(tc: &priv->session_cont);
4906
4907	spin_lock_irqsave(&iscsi_transport_lock, flags);
4908	list_add(new: &priv->list, head: &iscsi_transports);
4909	spin_unlock_irqrestore(lock: &iscsi_transport_lock, flags);
4910
4911	printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4912	return &priv->t;
4913
4914	unregister_dev:
4915	device_unregister(dev: &priv->dev);
4916	return NULL;
4917	put_dev:
4918	put_device(dev: &priv->dev);
4919	return NULL;
4920	}
4921	EXPORT_SYMBOL_GPL(iscsi_register_transport);
4922
4923	void iscsi_unregister_transport(struct iscsi_transport *tt)
4924	{
4925	struct iscsi_internal *priv;
4926	unsigned long flags;
4927
4928	BUG_ON(!tt);
4929
4930	mutex_lock(&rx_queue_mutex);
4931
4932	priv = iscsi_if_transport_lookup(tt);
4933	BUG_ON (!priv);
4934
4935	spin_lock_irqsave(&iscsi_transport_lock, flags);
4936	list_del(entry: &priv->list);
4937	spin_unlock_irqrestore(lock: &iscsi_transport_lock, flags);
4938
4939	transport_container_unregister(tc: &priv->conn_cont);
4940	transport_container_unregister(tc: &priv->session_cont);
4941	transport_container_unregister(tc: &priv->t.host_attrs);
4942
4943	sysfs_remove_group(kobj: &priv->dev.kobj, grp: &iscsi_transport_group);
4944	device_unregister(dev: &priv->dev);
4945	mutex_unlock(lock: &rx_queue_mutex);
4946	}
4947	EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4948
4949	void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4950	struct device *dev, const char *fmt, ...)
4951	{
4952	struct va_format vaf;
4953	va_list args;
4954
4955	va_start(args, fmt);
4956	vaf.fmt = fmt;
4957	vaf.va = &args;
4958	trace(dev, &vaf);
4959	va_end(args);
4960	}
4961	EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4962
4963	static __init int iscsi_transport_init(void)
4964	{
4965	int err;
4966	struct netlink_kernel_cfg cfg = {
4967	.groups = 1,
4968	.input = iscsi_if_rx,
4969	};
4970	printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4971	ISCSI_TRANSPORT_VERSION);
4972
4973	atomic_set(v: &iscsi_session_nr, i: 0);
4974
4975	err = class_register(class: &iscsi_transport_class);
4976	if (err)
4977	return err;
4978
4979	err = class_register(class: &iscsi_endpoint_class);
4980	if (err)
4981	goto unregister_transport_class;
4982
4983	err = class_register(class: &iscsi_iface_class);
4984	if (err)
4985	goto unregister_endpoint_class;
4986
4987	err = transport_class_register(&iscsi_host_class);
4988	if (err)
4989	goto unregister_iface_class;
4990
4991	err = transport_class_register(&iscsi_connection_class);
4992	if (err)
4993	goto unregister_host_class;
4994
4995	err = transport_class_register(&iscsi_session_class);
4996	if (err)
4997	goto unregister_conn_class;
4998
4999	err = bus_register(bus: &iscsi_flashnode_bus);
5000	if (err)
5001	goto unregister_session_class;
5002
5003	nls = netlink_kernel_create(net: &init_net, NETLINK_ISCSI, cfg: &cfg);
5004	if (!nls) {
5005	err = -ENOBUFS;
5006	goto unregister_flashnode_bus;
5007	}
5008
5009	iscsi_conn_cleanup_workq = alloc_workqueue(fmt: "%s",
5010	flags: WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, max_active: 0,
5011	"iscsi_conn_cleanup");
5012	if (!iscsi_conn_cleanup_workq) {
5013	err = -ENOMEM;
5014	goto release_nls;
5015	}
5016
5017	return 0;
5018
5019	release_nls:
5020	netlink_kernel_release(sk: nls);
5021	unregister_flashnode_bus:
5022	bus_unregister(bus: &iscsi_flashnode_bus);
5023	unregister_session_class:
5024	transport_class_unregister(&iscsi_session_class);
5025	unregister_conn_class:
5026	transport_class_unregister(&iscsi_connection_class);
5027	unregister_host_class:
5028	transport_class_unregister(&iscsi_host_class);
5029	unregister_iface_class:
5030	class_unregister(class: &iscsi_iface_class);
5031	unregister_endpoint_class:
5032	class_unregister(class: &iscsi_endpoint_class);
5033	unregister_transport_class:
5034	class_unregister(class: &iscsi_transport_class);
5035	return err;
5036	}
5037
5038	static void __exit iscsi_transport_exit(void)
5039	{
5040	destroy_workqueue(wq: iscsi_conn_cleanup_workq);
5041	netlink_kernel_release(sk: nls);
5042	bus_unregister(bus: &iscsi_flashnode_bus);
5043	transport_class_unregister(&iscsi_connection_class);
5044	transport_class_unregister(&iscsi_session_class);
5045	transport_class_unregister(&iscsi_host_class);
5046	class_unregister(class: &iscsi_endpoint_class);
5047	class_unregister(class: &iscsi_iface_class);
5048	class_unregister(class: &iscsi_transport_class);
5049	}
5050
5051	module_init(iscsi_transport_init);
5052	module_exit(iscsi_transport_exit);
5053
5054	MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
5055	"Dmitry Yusupov <dmitry_yus@yahoo.com>, "
5056	"Alex Aizman <itn780@yahoo.com>");
5057	MODULE_DESCRIPTION("iSCSI Transport Interface");
5058	MODULE_LICENSE("GPL");
5059	MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
5060	MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
5061