1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * iSCSI transport class definitions
4 *
5 * Copyright (C) IBM Corporation, 2004
6 * Copyright (C) Mike Christie, 2004 - 2005
7 * Copyright (C) Dmitry Yusupov, 2004 - 2005
8 * Copyright (C) Alex Aizman, 2004 - 2005
9 */
10 #include <linux/module.h>
11 #include <linux/mutex.h>
12 #include <linux/slab.h>
13 #include <linux/bsg-lib.h>
14 #include <linux/idr.h>
15 #include <net/tcp.h>
16 #include <scsi/scsi.h>
17 #include <scsi/scsi_host.h>
18 #include <scsi/scsi_device.h>
19 #include <scsi/scsi_transport.h>
20 #include <scsi/scsi_transport_iscsi.h>
21 #include <scsi/iscsi_if.h>
22 #include <scsi/scsi_cmnd.h>
23 #include <scsi/scsi_bsg_iscsi.h>
24
25 #define ISCSI_TRANSPORT_VERSION "2.0-870"
26
27 #define ISCSI_SEND_MAX_ALLOWED 10
28
29 #define CREATE_TRACE_POINTS
30 #include <trace/events/iscsi.h>
31
32 /*
33 * Export tracepoint symbols to be used by other modules.
34 */
35 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
36 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
37 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
38 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
39 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
40
41 static int dbg_session;
42 module_param_named(debug_session, dbg_session, int,
43 S_IRUGO | S_IWUSR);
44 MODULE_PARM_DESC(debug_session,
45 "Turn on debugging for sessions in scsi_transport_iscsi "
46 "module. Set to 1 to turn on, and zero to turn off. Default "
47 "is off.");
48
49 static int dbg_conn;
50 module_param_named(debug_conn, dbg_conn, int,
51 S_IRUGO | S_IWUSR);
52 MODULE_PARM_DESC(debug_conn,
53 "Turn on debugging for connections in scsi_transport_iscsi "
54 "module. Set to 1 to turn on, and zero to turn off. Default "
55 "is off.");
56
57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
58 do { \
59 if (dbg_session) \
60 iscsi_cls_session_printk(KERN_INFO, _session, \
61 "%s: " dbg_fmt, \
62 __func__, ##arg); \
63 iscsi_dbg_trace(trace_iscsi_dbg_trans_session, \
64 &(_session)->dev, \
65 "%s " dbg_fmt, __func__, ##arg); \
66 } while (0);
67
68 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
69 do { \
70 if (dbg_conn) \
71 iscsi_cls_conn_printk(KERN_INFO, _conn, \
72 "%s: " dbg_fmt, \
73 __func__, ##arg); \
74 iscsi_dbg_trace(trace_iscsi_dbg_trans_conn, \
75 &(_conn)->dev, \
76 "%s " dbg_fmt, __func__, ##arg); \
77 } while (0);
78
79 struct iscsi_internal {
80 struct scsi_transport_template t;
81 struct iscsi_transport *iscsi_transport;
82 struct list_head list;
83 struct device dev;
84
85 struct transport_container conn_cont;
86 struct transport_container session_cont;
87 };
88
89 /* Worker to perform connection failure on unresponsive connections
90 * completely in kernel space.
91 */
92 static void stop_conn_work_fn(struct work_struct *work);
93 static DECLARE_WORK(stop_conn_work, stop_conn_work_fn);
94
95 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
96 static struct workqueue_struct *iscsi_eh_timer_workq;
97
98 static struct workqueue_struct *iscsi_destroy_workq;
99
100 static DEFINE_IDA(iscsi_sess_ida);
101 /*
102 * list of registered transports and lock that must
103 * be held while accessing list. The iscsi_transport_lock must
104 * be acquired after the rx_queue_mutex.
105 */
106 static LIST_HEAD(iscsi_transports);
107 static DEFINE_SPINLOCK(iscsi_transport_lock);
108
109 #define to_iscsi_internal(tmpl) \
110 container_of(tmpl, struct iscsi_internal, t)
111
112 #define dev_to_iscsi_internal(_dev) \
113 container_of(_dev, struct iscsi_internal, dev)
114
iscsi_transport_release(struct device * dev)115 static void iscsi_transport_release(struct device *dev)
116 {
117 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
118 kfree(priv);
119 }
120
121 /*
122 * iscsi_transport_class represents the iscsi_transports that are
123 * registered.
124 */
125 static struct class iscsi_transport_class = {
126 .name = "iscsi_transport",
127 .dev_release = iscsi_transport_release,
128 };
129
130 static ssize_t
show_transport_handle(struct device * dev,struct device_attribute * attr,char * buf)131 show_transport_handle(struct device *dev, struct device_attribute *attr,
132 char *buf)
133 {
134 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
135
136 if (!capable(CAP_SYS_ADMIN))
137 return -EACCES;
138 return sysfs_emit(buf, "%llu\n",
139 (unsigned long long)iscsi_handle(priv->iscsi_transport));
140 }
141 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
142
143 #define show_transport_attr(name, format) \
144 static ssize_t \
145 show_transport_##name(struct device *dev, \
146 struct device_attribute *attr,char *buf) \
147 { \
148 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
149 return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
150 } \
151 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
152
153 show_transport_attr(caps, "0x%x");
154
155 static struct attribute *iscsi_transport_attrs[] = {
156 &dev_attr_handle.attr,
157 &dev_attr_caps.attr,
158 NULL,
159 };
160
161 static struct attribute_group iscsi_transport_group = {
162 .attrs = iscsi_transport_attrs,
163 };
164
165 /*
166 * iSCSI endpoint attrs
167 */
168 #define iscsi_dev_to_endpoint(_dev) \
169 container_of(_dev, struct iscsi_endpoint, dev)
170
171 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
172 struct device_attribute dev_attr_##_prefix##_##_name = \
173 __ATTR(_name,_mode,_show,_store)
174
iscsi_endpoint_release(struct device * dev)175 static void iscsi_endpoint_release(struct device *dev)
176 {
177 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
178 kfree(ep);
179 }
180
181 static struct class iscsi_endpoint_class = {
182 .name = "iscsi_endpoint",
183 .dev_release = iscsi_endpoint_release,
184 };
185
186 static ssize_t
show_ep_handle(struct device * dev,struct device_attribute * attr,char * buf)187 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
188 {
189 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
190 return sysfs_emit(buf, "%llu\n", (unsigned long long) ep->id);
191 }
192 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
193
194 static struct attribute *iscsi_endpoint_attrs[] = {
195 &dev_attr_ep_handle.attr,
196 NULL,
197 };
198
199 static struct attribute_group iscsi_endpoint_group = {
200 .attrs = iscsi_endpoint_attrs,
201 };
202
203 #define ISCSI_MAX_EPID -1
204
iscsi_match_epid(struct device * dev,const void * data)205 static int iscsi_match_epid(struct device *dev, const void *data)
206 {
207 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
208 const uint64_t *epid = data;
209
210 return *epid == ep->id;
211 }
212
213 struct iscsi_endpoint *
iscsi_create_endpoint(int dd_size)214 iscsi_create_endpoint(int dd_size)
215 {
216 struct device *dev;
217 struct iscsi_endpoint *ep;
218 uint64_t id;
219 int err;
220
221 for (id = 1; id < ISCSI_MAX_EPID; id++) {
222 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
223 iscsi_match_epid);
224 if (!dev)
225 break;
226 else
227 put_device(dev);
228 }
229 if (id == ISCSI_MAX_EPID) {
230 printk(KERN_ERR "Too many connections. Max supported %u\n",
231 ISCSI_MAX_EPID - 1);
232 return NULL;
233 }
234
235 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
236 if (!ep)
237 return NULL;
238
239 ep->id = id;
240 ep->dev.class = &iscsi_endpoint_class;
241 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
242 err = device_register(&ep->dev);
243 if (err)
244 goto free_ep;
245
246 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
247 if (err)
248 goto unregister_dev;
249
250 if (dd_size)
251 ep->dd_data = &ep[1];
252 return ep;
253
254 unregister_dev:
255 device_unregister(&ep->dev);
256 return NULL;
257
258 free_ep:
259 kfree(ep);
260 return NULL;
261 }
262 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
263
iscsi_destroy_endpoint(struct iscsi_endpoint * ep)264 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
265 {
266 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
267 device_unregister(&ep->dev);
268 }
269 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
270
iscsi_lookup_endpoint(u64 handle)271 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
272 {
273 struct iscsi_endpoint *ep;
274 struct device *dev;
275
276 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
277 iscsi_match_epid);
278 if (!dev)
279 return NULL;
280
281 ep = iscsi_dev_to_endpoint(dev);
282 /*
283 * we can drop this now because the interface will prevent
284 * removals and lookups from racing.
285 */
286 put_device(dev);
287 return ep;
288 }
289 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
290
291 /*
292 * Interface to display network param to sysfs
293 */
294
iscsi_iface_release(struct device * dev)295 static void iscsi_iface_release(struct device *dev)
296 {
297 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
298 struct device *parent = iface->dev.parent;
299
300 kfree(iface);
301 put_device(parent);
302 }
303
304
305 static struct class iscsi_iface_class = {
306 .name = "iscsi_iface",
307 .dev_release = iscsi_iface_release,
308 };
309
310 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store) \
311 struct device_attribute dev_attr_##_prefix##_##_name = \
312 __ATTR(_name, _mode, _show, _store)
313
314 /* iface attrs show */
315 #define iscsi_iface_attr_show(type, name, param_type, param) \
316 static ssize_t \
317 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
318 char *buf) \
319 { \
320 struct iscsi_iface *iface = iscsi_dev_to_iface(dev); \
321 struct iscsi_transport *t = iface->transport; \
322 return t->get_iface_param(iface, param_type, param, buf); \
323 } \
324
325 #define iscsi_iface_net_attr(type, name, param) \
326 iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param) \
327 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
328
329 #define iscsi_iface_attr(type, name, param) \
330 iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param) \
331 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
332
333 /* generic read only ipv4 attribute */
334 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
335 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
336 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
337 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
338 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
339 ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
340 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
341 ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
342 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
343 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
344 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
345 ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
346 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
347 ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
348 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
349 ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
350 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
351 ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
352 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
353 ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
354 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
355 ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
356 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
357 ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
358 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
359 ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
360 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
361 ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
362 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
363
364 /* generic read only ipv6 attribute */
365 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
366 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
367 ISCSI_NET_PARAM_IPV6_LINKLOCAL);
368 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
369 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
370 ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
371 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
372 ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
373 iscsi_iface_net_attr(ipv6_iface, link_local_state,
374 ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
375 iscsi_iface_net_attr(ipv6_iface, router_state,
376 ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
377 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
378 ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
379 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
380 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
381 iscsi_iface_net_attr(ipv6_iface, traffic_class,
382 ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
383 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
384 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
385 ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
386 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
387 ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
388 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
389 ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
390 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
391 ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
392 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
393 ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
394
395 /* common read only iface attribute */
396 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
397 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
398 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
399 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
400 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
401 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
402 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
403 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
404 iscsi_iface_net_attr(iface, tcp_nagle_disable,
405 ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
406 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
407 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
408 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
409 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
410 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
411 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
412
413 /* common iscsi specific settings attributes */
414 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
415 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
416 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
417 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
418 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
419 iscsi_iface_attr(iface, data_seq_in_order,
420 ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
421 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
422 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
423 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
424 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
425 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
426 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
427 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
428 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
429 iscsi_iface_attr(iface, discovery_auth_optional,
430 ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
431 iscsi_iface_attr(iface, discovery_logout,
432 ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
433 iscsi_iface_attr(iface, strict_login_comp_en,
434 ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
435 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
436
iscsi_iface_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)437 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
438 struct attribute *attr, int i)
439 {
440 struct device *dev = container_of(kobj, struct device, kobj);
441 struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
442 struct iscsi_transport *t = iface->transport;
443 int param = -1;
444
445 if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
446 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
447 else if (attr == &dev_attr_iface_header_digest.attr)
448 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
449 else if (attr == &dev_attr_iface_data_digest.attr)
450 param = ISCSI_IFACE_PARAM_DATADGST_EN;
451 else if (attr == &dev_attr_iface_immediate_data.attr)
452 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
453 else if (attr == &dev_attr_iface_initial_r2t.attr)
454 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
455 else if (attr == &dev_attr_iface_data_seq_in_order.attr)
456 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
457 else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
458 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
459 else if (attr == &dev_attr_iface_erl.attr)
460 param = ISCSI_IFACE_PARAM_ERL;
461 else if (attr == &dev_attr_iface_max_recv_dlength.attr)
462 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
463 else if (attr == &dev_attr_iface_first_burst_len.attr)
464 param = ISCSI_IFACE_PARAM_FIRST_BURST;
465 else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
466 param = ISCSI_IFACE_PARAM_MAX_R2T;
467 else if (attr == &dev_attr_iface_max_burst_len.attr)
468 param = ISCSI_IFACE_PARAM_MAX_BURST;
469 else if (attr == &dev_attr_iface_chap_auth.attr)
470 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
471 else if (attr == &dev_attr_iface_bidi_chap.attr)
472 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
473 else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
474 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
475 else if (attr == &dev_attr_iface_discovery_logout.attr)
476 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
477 else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
478 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
479 else if (attr == &dev_attr_iface_initiator_name.attr)
480 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
481
482 if (param != -1)
483 return t->attr_is_visible(ISCSI_IFACE_PARAM, param);
484
485 if (attr == &dev_attr_iface_enabled.attr)
486 param = ISCSI_NET_PARAM_IFACE_ENABLE;
487 else if (attr == &dev_attr_iface_vlan_id.attr)
488 param = ISCSI_NET_PARAM_VLAN_ID;
489 else if (attr == &dev_attr_iface_vlan_priority.attr)
490 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
491 else if (attr == &dev_attr_iface_vlan_enabled.attr)
492 param = ISCSI_NET_PARAM_VLAN_ENABLED;
493 else if (attr == &dev_attr_iface_mtu.attr)
494 param = ISCSI_NET_PARAM_MTU;
495 else if (attr == &dev_attr_iface_port.attr)
496 param = ISCSI_NET_PARAM_PORT;
497 else if (attr == &dev_attr_iface_ipaddress_state.attr)
498 param = ISCSI_NET_PARAM_IPADDR_STATE;
499 else if (attr == &dev_attr_iface_delayed_ack_en.attr)
500 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
501 else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
502 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
503 else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
504 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
505 else if (attr == &dev_attr_iface_tcp_wsf.attr)
506 param = ISCSI_NET_PARAM_TCP_WSF;
507 else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
508 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
509 else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
510 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
511 else if (attr == &dev_attr_iface_cache_id.attr)
512 param = ISCSI_NET_PARAM_CACHE_ID;
513 else if (attr == &dev_attr_iface_redirect_en.attr)
514 param = ISCSI_NET_PARAM_REDIRECT_EN;
515 else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
516 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
517 param = ISCSI_NET_PARAM_IPV4_ADDR;
518 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
519 param = ISCSI_NET_PARAM_IPV4_GW;
520 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
521 param = ISCSI_NET_PARAM_IPV4_SUBNET;
522 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
523 param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
524 else if (attr ==
525 &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
526 param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
527 else if (attr ==
528 &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
529 param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
530 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
531 param = ISCSI_NET_PARAM_IPV4_TOS_EN;
532 else if (attr == &dev_attr_ipv4_iface_tos.attr)
533 param = ISCSI_NET_PARAM_IPV4_TOS;
534 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
535 param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
536 else if (attr ==
537 &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
538 param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
539 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
540 param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
541 else if (attr ==
542 &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
543 param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
544 else if (attr ==
545 &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
546 param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
547 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
548 param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
549 else if (attr ==
550 &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
551 param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
552 else if (attr ==
553 &dev_attr_ipv4_iface_fragment_disable.attr)
554 param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
555 else if (attr ==
556 &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
557 param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
558 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
559 param = ISCSI_NET_PARAM_IPV4_TTL;
560 else
561 return 0;
562 } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
563 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
564 param = ISCSI_NET_PARAM_IPV6_ADDR;
565 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
566 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
567 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
568 param = ISCSI_NET_PARAM_IPV6_ROUTER;
569 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
570 param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
571 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
572 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
573 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
574 param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
575 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
576 param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
577 else if (attr ==
578 &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
579 param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
580 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
581 param = ISCSI_NET_PARAM_IPV6_MLD_EN;
582 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
583 param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
584 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
585 param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
586 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
587 param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
588 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
589 param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
590 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
591 param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
592 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
593 param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
594 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
595 param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
596 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
597 param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
598 else
599 return 0;
600 } else {
601 WARN_ONCE(1, "Invalid iface attr");
602 return 0;
603 }
604
605 return t->attr_is_visible(ISCSI_NET_PARAM, param);
606 }
607
608 static struct attribute *iscsi_iface_attrs[] = {
609 &dev_attr_iface_enabled.attr,
610 &dev_attr_iface_vlan_id.attr,
611 &dev_attr_iface_vlan_priority.attr,
612 &dev_attr_iface_vlan_enabled.attr,
613 &dev_attr_ipv4_iface_ipaddress.attr,
614 &dev_attr_ipv4_iface_gateway.attr,
615 &dev_attr_ipv4_iface_subnet.attr,
616 &dev_attr_ipv4_iface_bootproto.attr,
617 &dev_attr_ipv6_iface_ipaddress.attr,
618 &dev_attr_ipv6_iface_link_local_addr.attr,
619 &dev_attr_ipv6_iface_router_addr.attr,
620 &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
621 &dev_attr_ipv6_iface_link_local_autocfg.attr,
622 &dev_attr_iface_mtu.attr,
623 &dev_attr_iface_port.attr,
624 &dev_attr_iface_ipaddress_state.attr,
625 &dev_attr_iface_delayed_ack_en.attr,
626 &dev_attr_iface_tcp_nagle_disable.attr,
627 &dev_attr_iface_tcp_wsf_disable.attr,
628 &dev_attr_iface_tcp_wsf.attr,
629 &dev_attr_iface_tcp_timer_scale.attr,
630 &dev_attr_iface_tcp_timestamp_en.attr,
631 &dev_attr_iface_cache_id.attr,
632 &dev_attr_iface_redirect_en.attr,
633 &dev_attr_iface_def_taskmgmt_tmo.attr,
634 &dev_attr_iface_header_digest.attr,
635 &dev_attr_iface_data_digest.attr,
636 &dev_attr_iface_immediate_data.attr,
637 &dev_attr_iface_initial_r2t.attr,
638 &dev_attr_iface_data_seq_in_order.attr,
639 &dev_attr_iface_data_pdu_in_order.attr,
640 &dev_attr_iface_erl.attr,
641 &dev_attr_iface_max_recv_dlength.attr,
642 &dev_attr_iface_first_burst_len.attr,
643 &dev_attr_iface_max_outstanding_r2t.attr,
644 &dev_attr_iface_max_burst_len.attr,
645 &dev_attr_iface_chap_auth.attr,
646 &dev_attr_iface_bidi_chap.attr,
647 &dev_attr_iface_discovery_auth_optional.attr,
648 &dev_attr_iface_discovery_logout.attr,
649 &dev_attr_iface_strict_login_comp_en.attr,
650 &dev_attr_iface_initiator_name.attr,
651 &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
652 &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
653 &dev_attr_ipv4_iface_tos_en.attr,
654 &dev_attr_ipv4_iface_tos.attr,
655 &dev_attr_ipv4_iface_grat_arp_en.attr,
656 &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
657 &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
658 &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
659 &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
660 &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
661 &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
662 &dev_attr_ipv4_iface_fragment_disable.attr,
663 &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
664 &dev_attr_ipv4_iface_ttl.attr,
665 &dev_attr_ipv6_iface_link_local_state.attr,
666 &dev_attr_ipv6_iface_router_state.attr,
667 &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
668 &dev_attr_ipv6_iface_mld_en.attr,
669 &dev_attr_ipv6_iface_flow_label.attr,
670 &dev_attr_ipv6_iface_traffic_class.attr,
671 &dev_attr_ipv6_iface_hop_limit.attr,
672 &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
673 &dev_attr_ipv6_iface_nd_rexmit_time.attr,
674 &dev_attr_ipv6_iface_nd_stale_tmo.attr,
675 &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
676 &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
677 NULL,
678 };
679
680 static struct attribute_group iscsi_iface_group = {
681 .attrs = iscsi_iface_attrs,
682 .is_visible = iscsi_iface_attr_is_visible,
683 };
684
685 /* convert iscsi_ipaddress_state values to ascii string name */
686 static const struct {
687 enum iscsi_ipaddress_state value;
688 char *name;
689 } iscsi_ipaddress_state_names[] = {
690 {ISCSI_IPDDRESS_STATE_UNCONFIGURED, "Unconfigured" },
691 {ISCSI_IPDDRESS_STATE_ACQUIRING, "Acquiring" },
692 {ISCSI_IPDDRESS_STATE_TENTATIVE, "Tentative" },
693 {ISCSI_IPDDRESS_STATE_VALID, "Valid" },
694 {ISCSI_IPDDRESS_STATE_DISABLING, "Disabling" },
695 {ISCSI_IPDDRESS_STATE_INVALID, "Invalid" },
696 {ISCSI_IPDDRESS_STATE_DEPRECATED, "Deprecated" },
697 };
698
iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)699 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
700 {
701 int i;
702 char *state = NULL;
703
704 for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
705 if (iscsi_ipaddress_state_names[i].value == port_state) {
706 state = iscsi_ipaddress_state_names[i].name;
707 break;
708 }
709 }
710 return state;
711 }
712 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
713
714 /* convert iscsi_router_state values to ascii string name */
715 static const struct {
716 enum iscsi_router_state value;
717 char *name;
718 } iscsi_router_state_names[] = {
719 {ISCSI_ROUTER_STATE_UNKNOWN, "Unknown" },
720 {ISCSI_ROUTER_STATE_ADVERTISED, "Advertised" },
721 {ISCSI_ROUTER_STATE_MANUAL, "Manual" },
722 {ISCSI_ROUTER_STATE_STALE, "Stale" },
723 };
724
iscsi_get_router_state_name(enum iscsi_router_state router_state)725 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
726 {
727 int i;
728 char *state = NULL;
729
730 for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
731 if (iscsi_router_state_names[i].value == router_state) {
732 state = iscsi_router_state_names[i].name;
733 break;
734 }
735 }
736 return state;
737 }
738 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
739
740 struct iscsi_iface *
iscsi_create_iface(struct Scsi_Host * shost,struct iscsi_transport * transport,uint32_t iface_type,uint32_t iface_num,int dd_size)741 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
742 uint32_t iface_type, uint32_t iface_num, int dd_size)
743 {
744 struct iscsi_iface *iface;
745 int err;
746
747 iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
748 if (!iface)
749 return NULL;
750
751 iface->transport = transport;
752 iface->iface_type = iface_type;
753 iface->iface_num = iface_num;
754 iface->dev.release = iscsi_iface_release;
755 iface->dev.class = &iscsi_iface_class;
756 /* parent reference released in iscsi_iface_release */
757 iface->dev.parent = get_device(&shost->shost_gendev);
758 if (iface_type == ISCSI_IFACE_TYPE_IPV4)
759 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
760 iface_num);
761 else
762 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
763 iface_num);
764
765 err = device_register(&iface->dev);
766 if (err)
767 goto free_iface;
768
769 err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
770 if (err)
771 goto unreg_iface;
772
773 if (dd_size)
774 iface->dd_data = &iface[1];
775 return iface;
776
777 unreg_iface:
778 device_unregister(&iface->dev);
779 return NULL;
780
781 free_iface:
782 put_device(iface->dev.parent);
783 kfree(iface);
784 return NULL;
785 }
786 EXPORT_SYMBOL_GPL(iscsi_create_iface);
787
iscsi_destroy_iface(struct iscsi_iface * iface)788 void iscsi_destroy_iface(struct iscsi_iface *iface)
789 {
790 sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
791 device_unregister(&iface->dev);
792 }
793 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
794
795 /*
796 * Interface to display flash node params to sysfs
797 */
798
799 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store) \
800 struct device_attribute dev_attr_##_prefix##_##_name = \
801 __ATTR(_name, _mode, _show, _store)
802
803 /* flash node session attrs show */
804 #define iscsi_flashnode_sess_attr_show(type, name, param) \
805 static ssize_t \
806 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
807 char *buf) \
808 { \
809 struct iscsi_bus_flash_session *fnode_sess = \
810 iscsi_dev_to_flash_session(dev);\
811 struct iscsi_transport *t = fnode_sess->transport; \
812 return t->get_flashnode_param(fnode_sess, param, buf); \
813 } \
814
815
816 #define iscsi_flashnode_sess_attr(type, name, param) \
817 iscsi_flashnode_sess_attr_show(type, name, param) \
818 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO, \
819 show_##type##_##name, NULL);
820
821 /* Flash node session attributes */
822
823 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
824 ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
825 iscsi_flashnode_sess_attr(fnode, discovery_session,
826 ISCSI_FLASHNODE_DISCOVERY_SESS);
827 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
828 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
829 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
830 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
831 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
832 ISCSI_FLASHNODE_DATASEQ_INORDER);
833 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
834 ISCSI_FLASHNODE_PDU_INORDER);
835 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
836 iscsi_flashnode_sess_attr(fnode, discovery_logout,
837 ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
838 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
839 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
840 ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
841 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
842 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
843 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
844 iscsi_flashnode_sess_attr(fnode, def_time2retain,
845 ISCSI_FLASHNODE_DEF_TIME2RETAIN);
846 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
847 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
848 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
849 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
850 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
851 ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
852 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
853 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
854 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
855 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
856 ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
857 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
858 ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
859 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
860 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
861 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
862 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
863 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
864 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
865 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
866
867 static struct attribute *iscsi_flashnode_sess_attrs[] = {
868 &dev_attr_fnode_auto_snd_tgt_disable.attr,
869 &dev_attr_fnode_discovery_session.attr,
870 &dev_attr_fnode_portal_type.attr,
871 &dev_attr_fnode_entry_enable.attr,
872 &dev_attr_fnode_immediate_data.attr,
873 &dev_attr_fnode_initial_r2t.attr,
874 &dev_attr_fnode_data_seq_in_order.attr,
875 &dev_attr_fnode_data_pdu_in_order.attr,
876 &dev_attr_fnode_chap_auth.attr,
877 &dev_attr_fnode_discovery_logout.attr,
878 &dev_attr_fnode_bidi_chap.attr,
879 &dev_attr_fnode_discovery_auth_optional.attr,
880 &dev_attr_fnode_erl.attr,
881 &dev_attr_fnode_first_burst_len.attr,
882 &dev_attr_fnode_def_time2wait.attr,
883 &dev_attr_fnode_def_time2retain.attr,
884 &dev_attr_fnode_max_outstanding_r2t.attr,
885 &dev_attr_fnode_isid.attr,
886 &dev_attr_fnode_tsid.attr,
887 &dev_attr_fnode_max_burst_len.attr,
888 &dev_attr_fnode_def_taskmgmt_tmo.attr,
889 &dev_attr_fnode_targetalias.attr,
890 &dev_attr_fnode_targetname.attr,
891 &dev_attr_fnode_tpgt.attr,
892 &dev_attr_fnode_discovery_parent_idx.attr,
893 &dev_attr_fnode_discovery_parent_type.attr,
894 &dev_attr_fnode_chap_in_idx.attr,
895 &dev_attr_fnode_chap_out_idx.attr,
896 &dev_attr_fnode_username.attr,
897 &dev_attr_fnode_username_in.attr,
898 &dev_attr_fnode_password.attr,
899 &dev_attr_fnode_password_in.attr,
900 &dev_attr_fnode_is_boot_target.attr,
901 NULL,
902 };
903
iscsi_flashnode_sess_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)904 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
905 struct attribute *attr,
906 int i)
907 {
908 struct device *dev = container_of(kobj, struct device, kobj);
909 struct iscsi_bus_flash_session *fnode_sess =
910 iscsi_dev_to_flash_session(dev);
911 struct iscsi_transport *t = fnode_sess->transport;
912 int param;
913
914 if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
915 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
916 } else if (attr == &dev_attr_fnode_discovery_session.attr) {
917 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
918 } else if (attr == &dev_attr_fnode_portal_type.attr) {
919 param = ISCSI_FLASHNODE_PORTAL_TYPE;
920 } else if (attr == &dev_attr_fnode_entry_enable.attr) {
921 param = ISCSI_FLASHNODE_ENTRY_EN;
922 } else if (attr == &dev_attr_fnode_immediate_data.attr) {
923 param = ISCSI_FLASHNODE_IMM_DATA_EN;
924 } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
925 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
926 } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
927 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
928 } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
929 param = ISCSI_FLASHNODE_PDU_INORDER;
930 } else if (attr == &dev_attr_fnode_chap_auth.attr) {
931 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
932 } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
933 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
934 } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
935 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
936 } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
937 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
938 } else if (attr == &dev_attr_fnode_erl.attr) {
939 param = ISCSI_FLASHNODE_ERL;
940 } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
941 param = ISCSI_FLASHNODE_FIRST_BURST;
942 } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
943 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
944 } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
945 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
946 } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
947 param = ISCSI_FLASHNODE_MAX_R2T;
948 } else if (attr == &dev_attr_fnode_isid.attr) {
949 param = ISCSI_FLASHNODE_ISID;
950 } else if (attr == &dev_attr_fnode_tsid.attr) {
951 param = ISCSI_FLASHNODE_TSID;
952 } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
953 param = ISCSI_FLASHNODE_MAX_BURST;
954 } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
955 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
956 } else if (attr == &dev_attr_fnode_targetalias.attr) {
957 param = ISCSI_FLASHNODE_ALIAS;
958 } else if (attr == &dev_attr_fnode_targetname.attr) {
959 param = ISCSI_FLASHNODE_NAME;
960 } else if (attr == &dev_attr_fnode_tpgt.attr) {
961 param = ISCSI_FLASHNODE_TPGT;
962 } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
963 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
964 } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
965 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
966 } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
967 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
968 } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
969 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
970 } else if (attr == &dev_attr_fnode_username.attr) {
971 param = ISCSI_FLASHNODE_USERNAME;
972 } else if (attr == &dev_attr_fnode_username_in.attr) {
973 param = ISCSI_FLASHNODE_USERNAME_IN;
974 } else if (attr == &dev_attr_fnode_password.attr) {
975 param = ISCSI_FLASHNODE_PASSWORD;
976 } else if (attr == &dev_attr_fnode_password_in.attr) {
977 param = ISCSI_FLASHNODE_PASSWORD_IN;
978 } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
979 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
980 } else {
981 WARN_ONCE(1, "Invalid flashnode session attr");
982 return 0;
983 }
984
985 return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
986 }
987
988 static struct attribute_group iscsi_flashnode_sess_attr_group = {
989 .attrs = iscsi_flashnode_sess_attrs,
990 .is_visible = iscsi_flashnode_sess_attr_is_visible,
991 };
992
993 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
994 &iscsi_flashnode_sess_attr_group,
995 NULL,
996 };
997
iscsi_flashnode_sess_release(struct device * dev)998 static void iscsi_flashnode_sess_release(struct device *dev)
999 {
1000 struct iscsi_bus_flash_session *fnode_sess =
1001 iscsi_dev_to_flash_session(dev);
1002
1003 kfree(fnode_sess->targetname);
1004 kfree(fnode_sess->targetalias);
1005 kfree(fnode_sess->portal_type);
1006 kfree(fnode_sess);
1007 }
1008
1009 static const struct device_type iscsi_flashnode_sess_dev_type = {
1010 .name = "iscsi_flashnode_sess_dev_type",
1011 .groups = iscsi_flashnode_sess_attr_groups,
1012 .release = iscsi_flashnode_sess_release,
1013 };
1014
1015 /* flash node connection attrs show */
1016 #define iscsi_flashnode_conn_attr_show(type, name, param) \
1017 static ssize_t \
1018 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1019 char *buf) \
1020 { \
1021 struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1022 struct iscsi_bus_flash_session *fnode_sess = \
1023 iscsi_flash_conn_to_flash_session(fnode_conn);\
1024 struct iscsi_transport *t = fnode_conn->transport; \
1025 return t->get_flashnode_param(fnode_sess, param, buf); \
1026 } \
1027
1028
1029 #define iscsi_flashnode_conn_attr(type, name, param) \
1030 iscsi_flashnode_conn_attr_show(type, name, param) \
1031 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO, \
1032 show_##type##_##name, NULL);
1033
1034 /* Flash node connection attributes */
1035
1036 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1037 ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1038 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1039 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1040 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1041 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1042 ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1043 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1044 ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1045 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1046 ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1047 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1048 ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1049 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1050 ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1051 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1052 ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1053 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1054 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1055 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1056 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1057 ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1058 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1059 ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1060 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1061 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1062 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1063 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1064 ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1065 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1066 ISCSI_FLASHNODE_REDIRECT_IPADDR);
1067 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1068 ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1069 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1070 ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1071 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1072 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1073 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1074 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1075
1076 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1077 &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1078 &dev_attr_fnode_header_digest.attr,
1079 &dev_attr_fnode_data_digest.attr,
1080 &dev_attr_fnode_snack_req.attr,
1081 &dev_attr_fnode_tcp_timestamp_stat.attr,
1082 &dev_attr_fnode_tcp_nagle_disable.attr,
1083 &dev_attr_fnode_tcp_wsf_disable.attr,
1084 &dev_attr_fnode_tcp_timer_scale.attr,
1085 &dev_attr_fnode_tcp_timestamp_enable.attr,
1086 &dev_attr_fnode_fragment_disable.attr,
1087 &dev_attr_fnode_max_recv_dlength.attr,
1088 &dev_attr_fnode_max_xmit_dlength.attr,
1089 &dev_attr_fnode_keepalive_tmo.attr,
1090 &dev_attr_fnode_port.attr,
1091 &dev_attr_fnode_ipaddress.attr,
1092 &dev_attr_fnode_redirect_ipaddr.attr,
1093 &dev_attr_fnode_max_segment_size.attr,
1094 &dev_attr_fnode_local_port.attr,
1095 &dev_attr_fnode_ipv4_tos.attr,
1096 &dev_attr_fnode_ipv6_traffic_class.attr,
1097 &dev_attr_fnode_ipv6_flow_label.attr,
1098 &dev_attr_fnode_link_local_ipv6.attr,
1099 &dev_attr_fnode_tcp_xmit_wsf.attr,
1100 &dev_attr_fnode_tcp_recv_wsf.attr,
1101 &dev_attr_fnode_statsn.attr,
1102 &dev_attr_fnode_exp_statsn.attr,
1103 NULL,
1104 };
1105
iscsi_flashnode_conn_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)1106 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1107 struct attribute *attr,
1108 int i)
1109 {
1110 struct device *dev = container_of(kobj, struct device, kobj);
1111 struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1112 struct iscsi_transport *t = fnode_conn->transport;
1113 int param;
1114
1115 if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1116 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1117 } else if (attr == &dev_attr_fnode_header_digest.attr) {
1118 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1119 } else if (attr == &dev_attr_fnode_data_digest.attr) {
1120 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1121 } else if (attr == &dev_attr_fnode_snack_req.attr) {
1122 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1123 } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1124 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1125 } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1126 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1127 } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1128 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1129 } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1130 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1131 } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1132 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1133 } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1134 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1135 } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1136 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1137 } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1138 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1139 } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1140 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1141 } else if (attr == &dev_attr_fnode_port.attr) {
1142 param = ISCSI_FLASHNODE_PORT;
1143 } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1144 param = ISCSI_FLASHNODE_IPADDR;
1145 } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1146 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1147 } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1148 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1149 } else if (attr == &dev_attr_fnode_local_port.attr) {
1150 param = ISCSI_FLASHNODE_LOCAL_PORT;
1151 } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1152 param = ISCSI_FLASHNODE_IPV4_TOS;
1153 } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1154 param = ISCSI_FLASHNODE_IPV6_TC;
1155 } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1156 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1157 } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1158 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1159 } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1160 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1161 } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1162 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1163 } else if (attr == &dev_attr_fnode_statsn.attr) {
1164 param = ISCSI_FLASHNODE_STATSN;
1165 } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1166 param = ISCSI_FLASHNODE_EXP_STATSN;
1167 } else {
1168 WARN_ONCE(1, "Invalid flashnode connection attr");
1169 return 0;
1170 }
1171
1172 return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1173 }
1174
1175 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1176 .attrs = iscsi_flashnode_conn_attrs,
1177 .is_visible = iscsi_flashnode_conn_attr_is_visible,
1178 };
1179
1180 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1181 &iscsi_flashnode_conn_attr_group,
1182 NULL,
1183 };
1184
iscsi_flashnode_conn_release(struct device * dev)1185 static void iscsi_flashnode_conn_release(struct device *dev)
1186 {
1187 struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1188
1189 kfree(fnode_conn->ipaddress);
1190 kfree(fnode_conn->redirect_ipaddr);
1191 kfree(fnode_conn->link_local_ipv6_addr);
1192 kfree(fnode_conn);
1193 }
1194
1195 static const struct device_type iscsi_flashnode_conn_dev_type = {
1196 .name = "iscsi_flashnode_conn_dev_type",
1197 .groups = iscsi_flashnode_conn_attr_groups,
1198 .release = iscsi_flashnode_conn_release,
1199 };
1200
1201 static struct bus_type iscsi_flashnode_bus;
1202
iscsi_flashnode_bus_match(struct device * dev,struct device_driver * drv)1203 int iscsi_flashnode_bus_match(struct device *dev,
1204 struct device_driver *drv)
1205 {
1206 if (dev->bus == &iscsi_flashnode_bus)
1207 return 1;
1208 return 0;
1209 }
1210 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1211
1212 static struct bus_type iscsi_flashnode_bus = {
1213 .name = "iscsi_flashnode",
1214 .match = &iscsi_flashnode_bus_match,
1215 };
1216
1217 /**
1218 * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1219 * @shost: pointer to host data
1220 * @index: index of flashnode to add in sysfs
1221 * @transport: pointer to transport data
1222 * @dd_size: total size to allocate
1223 *
1224 * Adds a sysfs entry for the flashnode session attributes
1225 *
1226 * Returns:
1227 * pointer to allocated flashnode sess on success
1228 * %NULL on failure
1229 */
1230 struct iscsi_bus_flash_session *
iscsi_create_flashnode_sess(struct Scsi_Host * shost,int index,struct iscsi_transport * transport,int dd_size)1231 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1232 struct iscsi_transport *transport,
1233 int dd_size)
1234 {
1235 struct iscsi_bus_flash_session *fnode_sess;
1236 int err;
1237
1238 fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1239 if (!fnode_sess)
1240 return NULL;
1241
1242 fnode_sess->transport = transport;
1243 fnode_sess->target_id = index;
1244 fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1245 fnode_sess->dev.bus = &iscsi_flashnode_bus;
1246 fnode_sess->dev.parent = &shost->shost_gendev;
1247 dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1248 shost->host_no, index);
1249
1250 err = device_register(&fnode_sess->dev);
1251 if (err)
1252 goto free_fnode_sess;
1253
1254 if (dd_size)
1255 fnode_sess->dd_data = &fnode_sess[1];
1256
1257 return fnode_sess;
1258
1259 free_fnode_sess:
1260 kfree(fnode_sess);
1261 return NULL;
1262 }
1263 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1264
1265 /**
1266 * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1267 * @shost: pointer to host data
1268 * @fnode_sess: pointer to the parent flashnode session entry
1269 * @transport: pointer to transport data
1270 * @dd_size: total size to allocate
1271 *
1272 * Adds a sysfs entry for the flashnode connection attributes
1273 *
1274 * Returns:
1275 * pointer to allocated flashnode conn on success
1276 * %NULL on failure
1277 */
1278 struct iscsi_bus_flash_conn *
iscsi_create_flashnode_conn(struct Scsi_Host * shost,struct iscsi_bus_flash_session * fnode_sess,struct iscsi_transport * transport,int dd_size)1279 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1280 struct iscsi_bus_flash_session *fnode_sess,
1281 struct iscsi_transport *transport,
1282 int dd_size)
1283 {
1284 struct iscsi_bus_flash_conn *fnode_conn;
1285 int err;
1286
1287 fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1288 if (!fnode_conn)
1289 return NULL;
1290
1291 fnode_conn->transport = transport;
1292 fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1293 fnode_conn->dev.bus = &iscsi_flashnode_bus;
1294 fnode_conn->dev.parent = &fnode_sess->dev;
1295 dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1296 shost->host_no, fnode_sess->target_id);
1297
1298 err = device_register(&fnode_conn->dev);
1299 if (err)
1300 goto free_fnode_conn;
1301
1302 if (dd_size)
1303 fnode_conn->dd_data = &fnode_conn[1];
1304
1305 return fnode_conn;
1306
1307 free_fnode_conn:
1308 kfree(fnode_conn);
1309 return NULL;
1310 }
1311 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1312
1313 /**
1314 * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1315 * @dev: device to verify
1316 * @data: pointer to data containing value to use for verification
1317 *
1318 * Verifies if the passed device is flashnode conn device
1319 *
1320 * Returns:
1321 * 1 on success
1322 * 0 on failure
1323 */
iscsi_is_flashnode_conn_dev(struct device * dev,void * data)1324 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1325 {
1326 return dev->bus == &iscsi_flashnode_bus;
1327 }
1328
iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn * fnode_conn)1329 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1330 {
1331 device_unregister(&fnode_conn->dev);
1332 return 0;
1333 }
1334
flashnode_match_index(struct device * dev,void * data)1335 static int flashnode_match_index(struct device *dev, void *data)
1336 {
1337 struct iscsi_bus_flash_session *fnode_sess = NULL;
1338 int ret = 0;
1339
1340 if (!iscsi_flashnode_bus_match(dev, NULL))
1341 goto exit_match_index;
1342
1343 fnode_sess = iscsi_dev_to_flash_session(dev);
1344 ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1345
1346 exit_match_index:
1347 return ret;
1348 }
1349
1350 /**
1351 * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1352 * @shost: pointer to host data
1353 * @idx: index to match
1354 *
1355 * Finds the flashnode session object for the passed index
1356 *
1357 * Returns:
1358 * pointer to found flashnode session object on success
1359 * %NULL on failure
1360 */
1361 static struct iscsi_bus_flash_session *
iscsi_get_flashnode_by_index(struct Scsi_Host * shost,uint32_t idx)1362 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1363 {
1364 struct iscsi_bus_flash_session *fnode_sess = NULL;
1365 struct device *dev;
1366
1367 dev = device_find_child(&shost->shost_gendev, &idx,
1368 flashnode_match_index);
1369 if (dev)
1370 fnode_sess = iscsi_dev_to_flash_session(dev);
1371
1372 return fnode_sess;
1373 }
1374
1375 /**
1376 * iscsi_find_flashnode_sess - finds flashnode session entry
1377 * @shost: pointer to host data
1378 * @data: pointer to data containing value to use for comparison
1379 * @fn: function pointer that does actual comparison
1380 *
1381 * Finds the flashnode session object comparing the data passed using logic
1382 * defined in passed function pointer
1383 *
1384 * Returns:
1385 * pointer to found flashnode session device object on success
1386 * %NULL on failure
1387 */
1388 struct device *
iscsi_find_flashnode_sess(struct Scsi_Host * shost,void * data,int (* fn)(struct device * dev,void * data))1389 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1390 int (*fn)(struct device *dev, void *data))
1391 {
1392 return device_find_child(&shost->shost_gendev, data, fn);
1393 }
1394 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1395
1396 /**
1397 * iscsi_find_flashnode_conn - finds flashnode connection entry
1398 * @fnode_sess: pointer to parent flashnode session entry
1399 *
1400 * Finds the flashnode connection object comparing the data passed using logic
1401 * defined in passed function pointer
1402 *
1403 * Returns:
1404 * pointer to found flashnode connection device object on success
1405 * %NULL on failure
1406 */
1407 struct device *
iscsi_find_flashnode_conn(struct iscsi_bus_flash_session * fnode_sess)1408 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1409 {
1410 return device_find_child(&fnode_sess->dev, NULL,
1411 iscsi_is_flashnode_conn_dev);
1412 }
1413 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1414
iscsi_iter_destroy_flashnode_conn_fn(struct device * dev,void * data)1415 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1416 {
1417 if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1418 return 0;
1419
1420 return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1421 }
1422
1423 /**
1424 * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1425 * @fnode_sess: pointer to flashnode session entry to be destroyed
1426 *
1427 * Deletes the flashnode session entry and all children flashnode connection
1428 * entries from sysfs
1429 */
iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session * fnode_sess)1430 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1431 {
1432 int err;
1433
1434 err = device_for_each_child(&fnode_sess->dev, NULL,
1435 iscsi_iter_destroy_flashnode_conn_fn);
1436 if (err)
1437 pr_err("Could not delete all connections for %s. Error %d.\n",
1438 fnode_sess->dev.kobj.name, err);
1439
1440 device_unregister(&fnode_sess->dev);
1441 }
1442 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1443
iscsi_iter_destroy_flashnode_fn(struct device * dev,void * data)1444 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1445 {
1446 if (!iscsi_flashnode_bus_match(dev, NULL))
1447 return 0;
1448
1449 iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1450 return 0;
1451 }
1452
1453 /**
1454 * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1455 * @shost: pointer to host data
1456 *
1457 * Destroys all the flashnode session entries and all corresponding children
1458 * flashnode connection entries from sysfs
1459 */
iscsi_destroy_all_flashnode(struct Scsi_Host * shost)1460 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1461 {
1462 device_for_each_child(&shost->shost_gendev, NULL,
1463 iscsi_iter_destroy_flashnode_fn);
1464 }
1465 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1466
1467 /*
1468 * BSG support
1469 */
1470 /**
1471 * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1472 * @job: bsg job to be processed
1473 */
iscsi_bsg_host_dispatch(struct bsg_job * job)1474 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1475 {
1476 struct Scsi_Host *shost = iscsi_job_to_shost(job);
1477 struct iscsi_bsg_request *req = job->request;
1478 struct iscsi_bsg_reply *reply = job->reply;
1479 struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1480 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
1481 int ret;
1482
1483 /* check if we have the msgcode value at least */
1484 if (job->request_len < sizeof(uint32_t)) {
1485 ret = -ENOMSG;
1486 goto fail_host_msg;
1487 }
1488
1489 /* Validate the host command */
1490 switch (req->msgcode) {
1491 case ISCSI_BSG_HST_VENDOR:
1492 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1493 if ((shost->hostt->vendor_id == 0L) ||
1494 (req->rqst_data.h_vendor.vendor_id !=
1495 shost->hostt->vendor_id)) {
1496 ret = -ESRCH;
1497 goto fail_host_msg;
1498 }
1499 break;
1500 default:
1501 ret = -EBADR;
1502 goto fail_host_msg;
1503 }
1504
1505 /* check if we really have all the request data needed */
1506 if (job->request_len < cmdlen) {
1507 ret = -ENOMSG;
1508 goto fail_host_msg;
1509 }
1510
1511 ret = i->iscsi_transport->bsg_request(job);
1512 if (!ret)
1513 return 0;
1514
1515 fail_host_msg:
1516 /* return the errno failure code as the only status */
1517 BUG_ON(job->reply_len < sizeof(uint32_t));
1518 reply->reply_payload_rcv_len = 0;
1519 reply->result = ret;
1520 job->reply_len = sizeof(uint32_t);
1521 bsg_job_done(job, ret, 0);
1522 return 0;
1523 }
1524
1525 /**
1526 * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1527 * @shost: shost for iscsi_host
1528 * @ihost: iscsi_cls_host adding the structures to
1529 */
1530 static int
iscsi_bsg_host_add(struct Scsi_Host * shost,struct iscsi_cls_host * ihost)1531 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1532 {
1533 struct device *dev = &shost->shost_gendev;
1534 struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1535 struct request_queue *q;
1536 char bsg_name[20];
1537
1538 if (!i->iscsi_transport->bsg_request)
1539 return -ENOTSUPP;
1540
1541 snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1542 q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1543 if (IS_ERR(q)) {
1544 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1545 "initialize - no request queue\n");
1546 return PTR_ERR(q);
1547 }
1548 __scsi_init_queue(shost, q);
1549
1550 ihost->bsg_q = q;
1551 return 0;
1552 }
1553
iscsi_setup_host(struct transport_container * tc,struct device * dev,struct device * cdev)1554 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1555 struct device *cdev)
1556 {
1557 struct Scsi_Host *shost = dev_to_shost(dev);
1558 struct iscsi_cls_host *ihost = shost->shost_data;
1559
1560 memset(ihost, 0, sizeof(*ihost));
1561 atomic_set(&ihost->nr_scans, 0);
1562 mutex_init(&ihost->mutex);
1563
1564 iscsi_bsg_host_add(shost, ihost);
1565 /* ignore any bsg add error - we just can't do sgio */
1566
1567 return 0;
1568 }
1569
iscsi_remove_host(struct transport_container * tc,struct device * dev,struct device * cdev)1570 static int iscsi_remove_host(struct transport_container *tc,
1571 struct device *dev, struct device *cdev)
1572 {
1573 struct Scsi_Host *shost = dev_to_shost(dev);
1574 struct iscsi_cls_host *ihost = shost->shost_data;
1575
1576 bsg_remove_queue(ihost->bsg_q);
1577 return 0;
1578 }
1579
1580 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1581 "iscsi_host",
1582 iscsi_setup_host,
1583 iscsi_remove_host,
1584 NULL);
1585
1586 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1587 "iscsi_session",
1588 NULL,
1589 NULL,
1590 NULL);
1591
1592 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1593 "iscsi_connection",
1594 NULL,
1595 NULL,
1596 NULL);
1597
1598 static struct sock *nls;
1599 static DEFINE_MUTEX(rx_queue_mutex);
1600
1601 /*
1602 * conn_mutex protects the {start,bind,stop,destroy}_conn from racing
1603 * against the kernel stop_connection recovery mechanism
1604 */
1605 static DEFINE_MUTEX(conn_mutex);
1606
1607 static LIST_HEAD(sesslist);
1608 static DEFINE_SPINLOCK(sesslock);
1609 static LIST_HEAD(connlist);
1610 static LIST_HEAD(connlist_err);
1611 static DEFINE_SPINLOCK(connlock);
1612
iscsi_conn_get_sid(struct iscsi_cls_conn * conn)1613 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1614 {
1615 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1616 return sess->sid;
1617 }
1618
1619 /*
1620 * Returns the matching session to a given sid
1621 */
iscsi_session_lookup(uint32_t sid)1622 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1623 {
1624 unsigned long flags;
1625 struct iscsi_cls_session *sess;
1626
1627 spin_lock_irqsave(&sesslock, flags);
1628 list_for_each_entry(sess, &sesslist, sess_list) {
1629 if (sess->sid == sid) {
1630 spin_unlock_irqrestore(&sesslock, flags);
1631 return sess;
1632 }
1633 }
1634 spin_unlock_irqrestore(&sesslock, flags);
1635 return NULL;
1636 }
1637
1638 /*
1639 * Returns the matching connection to a given sid / cid tuple
1640 */
iscsi_conn_lookup(uint32_t sid,uint32_t cid)1641 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1642 {
1643 unsigned long flags;
1644 struct iscsi_cls_conn *conn;
1645
1646 spin_lock_irqsave(&connlock, flags);
1647 list_for_each_entry(conn, &connlist, conn_list) {
1648 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1649 spin_unlock_irqrestore(&connlock, flags);
1650 return conn;
1651 }
1652 }
1653 spin_unlock_irqrestore(&connlock, flags);
1654 return NULL;
1655 }
1656
1657 /*
1658 * The following functions can be used by LLDs that allocate
1659 * their own scsi_hosts or by software iscsi LLDs
1660 */
1661 static struct {
1662 int value;
1663 char *name;
1664 } iscsi_session_state_names[] = {
1665 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
1666 { ISCSI_SESSION_FAILED, "FAILED" },
1667 { ISCSI_SESSION_FREE, "FREE" },
1668 };
1669
iscsi_session_state_name(int state)1670 static const char *iscsi_session_state_name(int state)
1671 {
1672 int i;
1673 char *name = NULL;
1674
1675 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1676 if (iscsi_session_state_names[i].value == state) {
1677 name = iscsi_session_state_names[i].name;
1678 break;
1679 }
1680 }
1681 return name;
1682 }
1683
iscsi_session_chkready(struct iscsi_cls_session * session)1684 int iscsi_session_chkready(struct iscsi_cls_session *session)
1685 {
1686 unsigned long flags;
1687 int err;
1688
1689 spin_lock_irqsave(&session->lock, flags);
1690 switch (session->state) {
1691 case ISCSI_SESSION_LOGGED_IN:
1692 err = 0;
1693 break;
1694 case ISCSI_SESSION_FAILED:
1695 err = DID_IMM_RETRY << 16;
1696 break;
1697 case ISCSI_SESSION_FREE:
1698 err = DID_TRANSPORT_FAILFAST << 16;
1699 break;
1700 default:
1701 err = DID_NO_CONNECT << 16;
1702 break;
1703 }
1704 spin_unlock_irqrestore(&session->lock, flags);
1705 return err;
1706 }
1707 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1708
iscsi_is_session_online(struct iscsi_cls_session * session)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(&session->lock, flags);
1718 return ret;
1719 }
1720 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1721
iscsi_session_release(struct device * dev)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(shost);
1729 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1730 kfree(session);
1731 }
1732
iscsi_is_session_dev(const struct device * dev)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
iscsi_iter_session_fn(struct device * dev,void * data)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
iscsi_host_for_each_session(struct Scsi_Host * shost,void (* fn)(struct iscsi_cls_session *))1749 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1750 void (*fn)(struct iscsi_cls_session *))
1751 {
1752 device_for_each_child(&shost->shost_gendev, fn,
1753 iscsi_iter_session_fn);
1754 }
1755 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1756
1757 /**
1758 * iscsi_scan_finished - helper to report when running scans are done
1759 * @shost: scsi host
1760 * @time: scan run time
1761 *
1762 * This function can be used by drives like qla4xxx to report to the scsi
1763 * layer when the scans it kicked off at module load time are done.
1764 */
iscsi_scan_finished(struct Scsi_Host * shost,unsigned long time)1765 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1766 {
1767 struct iscsi_cls_host *ihost = shost->shost_data;
1768 /*
1769 * qla4xxx will have kicked off some session unblocks before calling
1770 * scsi_scan_host, so just wait for them to complete.
1771 */
1772 return !atomic_read(&ihost->nr_scans);
1773 }
1774 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1775
1776 struct iscsi_scan_data {
1777 unsigned int channel;
1778 unsigned int id;
1779 u64 lun;
1780 enum scsi_scan_mode rescan;
1781 };
1782
iscsi_user_scan_session(struct device * dev,void * data)1783 static int iscsi_user_scan_session(struct device *dev, void *data)
1784 {
1785 struct iscsi_scan_data *scan_data = data;
1786 struct iscsi_cls_session *session;
1787 struct Scsi_Host *shost;
1788 struct iscsi_cls_host *ihost;
1789 unsigned long flags;
1790 unsigned int id;
1791
1792 if (!iscsi_is_session_dev(dev))
1793 return 0;
1794
1795 session = iscsi_dev_to_session(dev);
1796
1797 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1798
1799 shost = iscsi_session_to_shost(session);
1800 ihost = shost->shost_data;
1801
1802 mutex_lock(&ihost->mutex);
1803 spin_lock_irqsave(&session->lock, flags);
1804 if (session->state != ISCSI_SESSION_LOGGED_IN) {
1805 spin_unlock_irqrestore(&session->lock, flags);
1806 goto user_scan_exit;
1807 }
1808 id = session->target_id;
1809 spin_unlock_irqrestore(&session->lock, flags);
1810
1811 if (id != ISCSI_MAX_TARGET) {
1812 if ((scan_data->channel == SCAN_WILD_CARD ||
1813 scan_data->channel == 0) &&
1814 (scan_data->id == SCAN_WILD_CARD ||
1815 scan_data->id == id))
1816 scsi_scan_target(&session->dev, 0, id,
1817 scan_data->lun, scan_data->rescan);
1818 }
1819
1820 user_scan_exit:
1821 mutex_unlock(&ihost->mutex);
1822 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1823 return 0;
1824 }
1825
iscsi_user_scan(struct Scsi_Host * shost,uint channel,uint id,u64 lun)1826 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1827 uint id, u64 lun)
1828 {
1829 struct iscsi_scan_data scan_data;
1830
1831 scan_data.channel = channel;
1832 scan_data.id = id;
1833 scan_data.lun = lun;
1834 scan_data.rescan = SCSI_SCAN_MANUAL;
1835
1836 return device_for_each_child(&shost->shost_gendev, &scan_data,
1837 iscsi_user_scan_session);
1838 }
1839
iscsi_scan_session(struct work_struct * work)1840 static void iscsi_scan_session(struct work_struct *work)
1841 {
1842 struct iscsi_cls_session *session =
1843 container_of(work, struct iscsi_cls_session, scan_work);
1844 struct Scsi_Host *shost = iscsi_session_to_shost(session);
1845 struct iscsi_cls_host *ihost = shost->shost_data;
1846 struct iscsi_scan_data scan_data;
1847
1848 scan_data.channel = 0;
1849 scan_data.id = SCAN_WILD_CARD;
1850 scan_data.lun = SCAN_WILD_CARD;
1851 scan_data.rescan = SCSI_SCAN_RESCAN;
1852
1853 iscsi_user_scan_session(&session->dev, &scan_data);
1854 atomic_dec(&ihost->nr_scans);
1855 }
1856
1857 /**
1858 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1859 * @cmd: scsi cmd passed to scsi eh handler
1860 *
1861 * If the session is down this function will wait for the recovery
1862 * timer to fire or for the session to be logged back in. If the
1863 * recovery timer fires then FAST_IO_FAIL is returned. The caller
1864 * should pass this error value to the scsi eh.
1865 */
iscsi_block_scsi_eh(struct scsi_cmnd * cmd)1866 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1867 {
1868 struct iscsi_cls_session *session =
1869 starget_to_session(scsi_target(cmd->device));
1870 unsigned long flags;
1871 int ret = 0;
1872
1873 spin_lock_irqsave(&session->lock, flags);
1874 while (session->state != ISCSI_SESSION_LOGGED_IN) {
1875 if (session->state == ISCSI_SESSION_FREE) {
1876 ret = FAST_IO_FAIL;
1877 break;
1878 }
1879 spin_unlock_irqrestore(&session->lock, flags);
1880 msleep(1000);
1881 spin_lock_irqsave(&session->lock, flags);
1882 }
1883 spin_unlock_irqrestore(&session->lock, flags);
1884 return ret;
1885 }
1886 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1887
session_recovery_timedout(struct work_struct * work)1888 static void session_recovery_timedout(struct work_struct *work)
1889 {
1890 struct iscsi_cls_session *session =
1891 container_of(work, struct iscsi_cls_session,
1892 recovery_work.work);
1893 unsigned long flags;
1894
1895 iscsi_cls_session_printk(KERN_INFO, session,
1896 "session recovery timed out after %d secs\n",
1897 session->recovery_tmo);
1898
1899 spin_lock_irqsave(&session->lock, flags);
1900 switch (session->state) {
1901 case ISCSI_SESSION_FAILED:
1902 session->state = ISCSI_SESSION_FREE;
1903 break;
1904 case ISCSI_SESSION_LOGGED_IN:
1905 case ISCSI_SESSION_FREE:
1906 /* we raced with the unblock's flush */
1907 spin_unlock_irqrestore(&session->lock, flags);
1908 return;
1909 }
1910 spin_unlock_irqrestore(&session->lock, flags);
1911
1912 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1913 scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1914 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1915
1916 if (session->transport->session_recovery_timedout)
1917 session->transport->session_recovery_timedout(session);
1918 }
1919
__iscsi_unblock_session(struct work_struct * work)1920 static void __iscsi_unblock_session(struct work_struct *work)
1921 {
1922 struct iscsi_cls_session *session =
1923 container_of(work, struct iscsi_cls_session,
1924 unblock_work);
1925 struct Scsi_Host *shost = iscsi_session_to_shost(session);
1926 struct iscsi_cls_host *ihost = shost->shost_data;
1927 unsigned long flags;
1928
1929 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1930 /*
1931 * The recovery and unblock work get run from the same workqueue,
1932 * so try to cancel it if it was going to run after this unblock.
1933 */
1934 cancel_delayed_work(&session->recovery_work);
1935 spin_lock_irqsave(&session->lock, flags);
1936 session->state = ISCSI_SESSION_LOGGED_IN;
1937 spin_unlock_irqrestore(&session->lock, flags);
1938 /* start IO */
1939 scsi_target_unblock(&session->dev, SDEV_RUNNING);
1940 /*
1941 * Only do kernel scanning if the driver is properly hooked into
1942 * the async scanning code (drivers like iscsi_tcp do login and
1943 * scanning from userspace).
1944 */
1945 if (shost->hostt->scan_finished) {
1946 if (scsi_queue_work(shost, &session->scan_work))
1947 atomic_inc(&ihost->nr_scans);
1948 }
1949 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1950 }
1951
1952 /**
1953 * iscsi_unblock_session - set a session as logged in and start IO.
1954 * @session: iscsi session
1955 *
1956 * Mark a session as ready to accept IO.
1957 */
iscsi_unblock_session(struct iscsi_cls_session * session)1958 void iscsi_unblock_session(struct iscsi_cls_session *session)
1959 {
1960 flush_work(&session->block_work);
1961
1962 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1963 /*
1964 * Blocking the session can be done from any context so we only
1965 * queue the block work. Make sure the unblock work has completed
1966 * because it flushes/cancels the other works and updates the state.
1967 */
1968 flush_work(&session->unblock_work);
1969 }
1970 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1971
__iscsi_block_session(struct work_struct * work)1972 static void __iscsi_block_session(struct work_struct *work)
1973 {
1974 struct iscsi_cls_session *session =
1975 container_of(work, struct iscsi_cls_session,
1976 block_work);
1977 unsigned long flags;
1978
1979 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1980 spin_lock_irqsave(&session->lock, flags);
1981 session->state = ISCSI_SESSION_FAILED;
1982 spin_unlock_irqrestore(&session->lock, flags);
1983 scsi_target_block(&session->dev);
1984 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1985 if (session->recovery_tmo >= 0)
1986 queue_delayed_work(iscsi_eh_timer_workq,
1987 &session->recovery_work,
1988 session->recovery_tmo * HZ);
1989 }
1990
iscsi_block_session(struct iscsi_cls_session * session)1991 void iscsi_block_session(struct iscsi_cls_session *session)
1992 {
1993 queue_work(iscsi_eh_timer_workq, &session->block_work);
1994 }
1995 EXPORT_SYMBOL_GPL(iscsi_block_session);
1996
__iscsi_unbind_session(struct work_struct * work)1997 static void __iscsi_unbind_session(struct work_struct *work)
1998 {
1999 struct iscsi_cls_session *session =
2000 container_of(work, struct iscsi_cls_session,
2001 unbind_work);
2002 struct Scsi_Host *shost = iscsi_session_to_shost(session);
2003 struct iscsi_cls_host *ihost = shost->shost_data;
2004 unsigned long flags;
2005 unsigned int target_id;
2006
2007 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2008
2009 /* Prevent new scans and make sure scanning is not in progress */
2010 mutex_lock(&ihost->mutex);
2011 spin_lock_irqsave(&session->lock, flags);
2012 if (session->target_id == ISCSI_MAX_TARGET) {
2013 spin_unlock_irqrestore(&session->lock, flags);
2014 mutex_unlock(&ihost->mutex);
2015 goto unbind_session_exit;
2016 }
2017
2018 target_id = session->target_id;
2019 session->target_id = ISCSI_MAX_TARGET;
2020 spin_unlock_irqrestore(&session->lock, flags);
2021 mutex_unlock(&ihost->mutex);
2022
2023 scsi_remove_target(&session->dev);
2024
2025 if (session->ida_used)
2026 ida_simple_remove(&iscsi_sess_ida, target_id);
2027
2028 unbind_session_exit:
2029 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2030 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2031 }
2032
__iscsi_destroy_session(struct work_struct * work)2033 static void __iscsi_destroy_session(struct work_struct *work)
2034 {
2035 struct iscsi_cls_session *session =
2036 container_of(work, struct iscsi_cls_session, destroy_work);
2037
2038 session->transport->destroy_session(session);
2039 }
2040
2041 struct iscsi_cls_session *
iscsi_alloc_session(struct Scsi_Host * shost,struct iscsi_transport * transport,int dd_size)2042 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2043 int dd_size)
2044 {
2045 struct iscsi_cls_session *session;
2046
2047 session = kzalloc(sizeof(*session) + dd_size,
2048 GFP_KERNEL);
2049 if (!session)
2050 return NULL;
2051
2052 session->transport = transport;
2053 session->creator = -1;
2054 session->recovery_tmo = 120;
2055 session->recovery_tmo_sysfs_override = false;
2056 session->state = ISCSI_SESSION_FREE;
2057 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2058 INIT_LIST_HEAD(&session->sess_list);
2059 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2060 INIT_WORK(&session->block_work, __iscsi_block_session);
2061 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2062 INIT_WORK(&session->scan_work, iscsi_scan_session);
2063 INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2064 spin_lock_init(&session->lock);
2065
2066 /* this is released in the dev's release function */
2067 scsi_host_get(shost);
2068 session->dev.parent = &shost->shost_gendev;
2069 session->dev.release = iscsi_session_release;
2070 device_initialize(&session->dev);
2071 if (dd_size)
2072 session->dd_data = &session[1];
2073
2074 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2075 return session;
2076 }
2077 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2078
iscsi_add_session(struct iscsi_cls_session * session,unsigned int target_id)2079 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2080 {
2081 unsigned long flags;
2082 int id = 0;
2083 int err;
2084
2085 session->sid = atomic_add_return(1, &iscsi_session_nr);
2086
2087 if (target_id == ISCSI_MAX_TARGET) {
2088 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2089
2090 if (id < 0) {
2091 iscsi_cls_session_printk(KERN_ERR, session,
2092 "Failure in Target ID Allocation\n");
2093 return id;
2094 }
2095 session->target_id = (unsigned int)id;
2096 session->ida_used = true;
2097 } else
2098 session->target_id = target_id;
2099
2100 dev_set_name(&session->dev, "session%u", session->sid);
2101 err = device_add(&session->dev);
2102 if (err) {
2103 iscsi_cls_session_printk(KERN_ERR, session,
2104 "could not register session's dev\n");
2105 goto release_ida;
2106 }
2107 err = transport_register_device(&session->dev);
2108 if (err) {
2109 iscsi_cls_session_printk(KERN_ERR, session,
2110 "could not register transport's dev\n");
2111 goto release_dev;
2112 }
2113
2114 spin_lock_irqsave(&sesslock, flags);
2115 list_add(&session->sess_list, &sesslist);
2116 spin_unlock_irqrestore(&sesslock, flags);
2117
2118 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2119 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2120 return 0;
2121
2122 release_dev:
2123 device_del(&session->dev);
2124 release_ida:
2125 if (session->ida_used)
2126 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2127
2128 return err;
2129 }
2130 EXPORT_SYMBOL_GPL(iscsi_add_session);
2131
2132 /**
2133 * iscsi_create_session - create iscsi class session
2134 * @shost: scsi host
2135 * @transport: iscsi transport
2136 * @dd_size: private driver data size
2137 * @target_id: which target
2138 *
2139 * This can be called from a LLD or iscsi_transport.
2140 */
2141 struct iscsi_cls_session *
iscsi_create_session(struct Scsi_Host * shost,struct iscsi_transport * transport,int dd_size,unsigned int target_id)2142 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2143 int dd_size, unsigned int target_id)
2144 {
2145 struct iscsi_cls_session *session;
2146
2147 session = iscsi_alloc_session(shost, transport, dd_size);
2148 if (!session)
2149 return NULL;
2150
2151 if (iscsi_add_session(session, target_id)) {
2152 iscsi_free_session(session);
2153 return NULL;
2154 }
2155 return session;
2156 }
2157 EXPORT_SYMBOL_GPL(iscsi_create_session);
2158
iscsi_conn_release(struct device * dev)2159 static void iscsi_conn_release(struct device *dev)
2160 {
2161 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2162 struct device *parent = conn->dev.parent;
2163
2164 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2165 kfree(conn);
2166 put_device(parent);
2167 }
2168
iscsi_is_conn_dev(const struct device * dev)2169 static int iscsi_is_conn_dev(const struct device *dev)
2170 {
2171 return dev->release == iscsi_conn_release;
2172 }
2173
iscsi_iter_destroy_conn_fn(struct device * dev,void * data)2174 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2175 {
2176 if (!iscsi_is_conn_dev(dev))
2177 return 0;
2178 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2179 }
2180
iscsi_remove_session(struct iscsi_cls_session * session)2181 void iscsi_remove_session(struct iscsi_cls_session *session)
2182 {
2183 unsigned long flags;
2184 int err;
2185
2186 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2187
2188 spin_lock_irqsave(&sesslock, flags);
2189 if (!list_empty(&session->sess_list))
2190 list_del(&session->sess_list);
2191 spin_unlock_irqrestore(&sesslock, flags);
2192
2193 flush_work(&session->block_work);
2194 flush_work(&session->unblock_work);
2195 cancel_delayed_work_sync(&session->recovery_work);
2196 /*
2197 * If we are blocked let commands flow again. The lld or iscsi
2198 * layer should set up the queuecommand to fail commands.
2199 * We assume that LLD will not be calling block/unblock while
2200 * removing the session.
2201 */
2202 spin_lock_irqsave(&session->lock, flags);
2203 session->state = ISCSI_SESSION_FREE;
2204 spin_unlock_irqrestore(&session->lock, flags);
2205
2206 scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2207 /* flush running scans then delete devices */
2208 flush_work(&session->scan_work);
2209 /* flush running unbind operations */
2210 flush_work(&session->unbind_work);
2211 __iscsi_unbind_session(&session->unbind_work);
2212
2213 /* hw iscsi may not have removed all connections from session */
2214 err = device_for_each_child(&session->dev, NULL,
2215 iscsi_iter_destroy_conn_fn);
2216 if (err)
2217 iscsi_cls_session_printk(KERN_ERR, session,
2218 "Could not delete all connections "
2219 "for session. Error %d.\n", err);
2220
2221 transport_unregister_device(&session->dev);
2222
2223 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2224 device_del(&session->dev);
2225 }
2226 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2227
iscsi_free_session(struct iscsi_cls_session * session)2228 void iscsi_free_session(struct iscsi_cls_session *session)
2229 {
2230 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2231 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2232 put_device(&session->dev);
2233 }
2234 EXPORT_SYMBOL_GPL(iscsi_free_session);
2235
2236 /**
2237 * iscsi_create_conn - create iscsi class connection
2238 * @session: iscsi cls session
2239 * @dd_size: private driver data size
2240 * @cid: connection id
2241 *
2242 * This can be called from a LLD or iscsi_transport. The connection
2243 * is child of the session so cid must be unique for all connections
2244 * on the session.
2245 *
2246 * Since we do not support MCS, cid will normally be zero. In some cases
2247 * for software iscsi we could be trying to preallocate a connection struct
2248 * in which case there could be two connection structs and cid would be
2249 * non-zero.
2250 */
2251 struct iscsi_cls_conn *
iscsi_create_conn(struct iscsi_cls_session * session,int dd_size,uint32_t cid)2252 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2253 {
2254 struct iscsi_transport *transport = session->transport;
2255 struct iscsi_cls_conn *conn;
2256 unsigned long flags;
2257 int err;
2258
2259 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2260 if (!conn)
2261 return NULL;
2262 if (dd_size)
2263 conn->dd_data = &conn[1];
2264
2265 mutex_init(&conn->ep_mutex);
2266 INIT_LIST_HEAD(&conn->conn_list);
2267 INIT_LIST_HEAD(&conn->conn_list_err);
2268 conn->transport = transport;
2269 conn->cid = cid;
2270 conn->state = ISCSI_CONN_DOWN;
2271
2272 /* this is released in the dev's release function */
2273 if (!get_device(&session->dev))
2274 goto free_conn;
2275
2276 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2277 conn->dev.parent = &session->dev;
2278 conn->dev.release = iscsi_conn_release;
2279 err = device_register(&conn->dev);
2280 if (err) {
2281 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2282 "register connection's dev\n");
2283 goto release_parent_ref;
2284 }
2285 err = transport_register_device(&conn->dev);
2286 if (err) {
2287 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2288 "register transport's dev\n");
2289 goto release_conn_ref;
2290 }
2291
2292 spin_lock_irqsave(&connlock, flags);
2293 list_add(&conn->conn_list, &connlist);
2294 spin_unlock_irqrestore(&connlock, flags);
2295
2296 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2297 return conn;
2298
2299 release_conn_ref:
2300 device_unregister(&conn->dev);
2301 put_device(&session->dev);
2302 return NULL;
2303 release_parent_ref:
2304 put_device(&session->dev);
2305 free_conn:
2306 kfree(conn);
2307 return NULL;
2308 }
2309
2310 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2311
2312 /**
2313 * iscsi_destroy_conn - destroy iscsi class connection
2314 * @conn: iscsi cls session
2315 *
2316 * This can be called from a LLD or iscsi_transport.
2317 */
iscsi_destroy_conn(struct iscsi_cls_conn * conn)2318 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2319 {
2320 unsigned long flags;
2321
2322 spin_lock_irqsave(&connlock, flags);
2323 list_del(&conn->conn_list);
2324 list_del(&conn->conn_list_err);
2325 spin_unlock_irqrestore(&connlock, flags);
2326
2327 transport_unregister_device(&conn->dev);
2328 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2329 device_unregister(&conn->dev);
2330 return 0;
2331 }
2332 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2333
iscsi_put_conn(struct iscsi_cls_conn * conn)2334 void iscsi_put_conn(struct iscsi_cls_conn *conn)
2335 {
2336 put_device(&conn->dev);
2337 }
2338 EXPORT_SYMBOL_GPL(iscsi_put_conn);
2339
iscsi_get_conn(struct iscsi_cls_conn * conn)2340 void iscsi_get_conn(struct iscsi_cls_conn *conn)
2341 {
2342 get_device(&conn->dev);
2343 }
2344 EXPORT_SYMBOL_GPL(iscsi_get_conn);
2345
2346 /*
2347 * iscsi interface functions
2348 */
2349 static struct iscsi_internal *
iscsi_if_transport_lookup(struct iscsi_transport * tt)2350 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2351 {
2352 struct iscsi_internal *priv;
2353 unsigned long flags;
2354
2355 spin_lock_irqsave(&iscsi_transport_lock, flags);
2356 list_for_each_entry(priv, &iscsi_transports, list) {
2357 if (tt == priv->iscsi_transport) {
2358 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2359 return priv;
2360 }
2361 }
2362 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2363 return NULL;
2364 }
2365
2366 static int
iscsi_multicast_skb(struct sk_buff * skb,uint32_t group,gfp_t gfp)2367 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2368 {
2369 return nlmsg_multicast(nls, skb, 0, group, gfp);
2370 }
2371
2372 static int
iscsi_unicast_skb(struct sk_buff * skb,u32 portid)2373 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2374 {
2375 return nlmsg_unicast(nls, skb, portid);
2376 }
2377
iscsi_recv_pdu(struct iscsi_cls_conn * conn,struct iscsi_hdr * hdr,char * data,uint32_t data_size)2378 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2379 char *data, uint32_t data_size)
2380 {
2381 struct nlmsghdr *nlh;
2382 struct sk_buff *skb;
2383 struct iscsi_uevent *ev;
2384 char *pdu;
2385 struct iscsi_internal *priv;
2386 int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2387 data_size);
2388
2389 priv = iscsi_if_transport_lookup(conn->transport);
2390 if (!priv)
2391 return -EINVAL;
2392
2393 skb = alloc_skb(len, GFP_ATOMIC);
2394 if (!skb) {
2395 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2396 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2397 "control PDU: OOM\n");
2398 return -ENOMEM;
2399 }
2400
2401 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2402 ev = nlmsg_data(nlh);
2403 memset(ev, 0, sizeof(*ev));
2404 ev->transport_handle = iscsi_handle(conn->transport);
2405 ev->type = ISCSI_KEVENT_RECV_PDU;
2406 ev->r.recv_req.cid = conn->cid;
2407 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2408 pdu = (char*)ev + sizeof(*ev);
2409 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2410 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2411
2412 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2413 }
2414 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2415
iscsi_offload_mesg(struct Scsi_Host * shost,struct iscsi_transport * transport,uint32_t type,char * data,uint16_t data_size)2416 int iscsi_offload_mesg(struct Scsi_Host *shost,
2417 struct iscsi_transport *transport, uint32_t type,
2418 char *data, uint16_t data_size)
2419 {
2420 struct nlmsghdr *nlh;
2421 struct sk_buff *skb;
2422 struct iscsi_uevent *ev;
2423 int len = nlmsg_total_size(sizeof(*ev) + data_size);
2424
2425 skb = alloc_skb(len, GFP_ATOMIC);
2426 if (!skb) {
2427 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2428 return -ENOMEM;
2429 }
2430
2431 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2432 ev = nlmsg_data(nlh);
2433 memset(ev, 0, sizeof(*ev));
2434 ev->type = type;
2435 ev->transport_handle = iscsi_handle(transport);
2436 switch (type) {
2437 case ISCSI_KEVENT_PATH_REQ:
2438 ev->r.req_path.host_no = shost->host_no;
2439 break;
2440 case ISCSI_KEVENT_IF_DOWN:
2441 ev->r.notify_if_down.host_no = shost->host_no;
2442 break;
2443 }
2444
2445 memcpy((char *)ev + sizeof(*ev), data, data_size);
2446
2447 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2448 }
2449 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2450
2451 /*
2452 * This can be called without the rx_queue_mutex, if invoked by the kernel
2453 * stop work. But, in that case, it is guaranteed not to race with
2454 * iscsi_destroy by conn_mutex.
2455 */
iscsi_if_stop_conn(struct iscsi_cls_conn * conn,int flag)2456 static void iscsi_if_stop_conn(struct iscsi_cls_conn *conn, int flag)
2457 {
2458 /*
2459 * It is important that this path doesn't rely on
2460 * rx_queue_mutex, otherwise, a thread doing allocation on a
2461 * start_session/start_connection could sleep waiting on a
2462 * writeback to a failed iscsi device, that cannot be recovered
2463 * because the lock is held. If we don't hold it here, the
2464 * kernel stop_conn_work_fn has a chance to stop the broken
2465 * session and resolve the allocation.
2466 *
2467 * Still, the user invoked .stop_conn() needs to be serialized
2468 * with stop_conn_work_fn by a private mutex. Not pretty, but
2469 * it works.
2470 */
2471 mutex_lock(&conn_mutex);
2472 switch (flag) {
2473 case STOP_CONN_RECOVER:
2474 conn->state = ISCSI_CONN_FAILED;
2475 break;
2476 case STOP_CONN_TERM:
2477 conn->state = ISCSI_CONN_DOWN;
2478 break;
2479 default:
2480 iscsi_cls_conn_printk(KERN_ERR, conn,
2481 "invalid stop flag %d\n", flag);
2482 goto unlock;
2483 }
2484
2485 conn->transport->stop_conn(conn, flag);
2486 unlock:
2487 mutex_unlock(&conn_mutex);
2488 }
2489
stop_conn_work_fn(struct work_struct * work)2490 static void stop_conn_work_fn(struct work_struct *work)
2491 {
2492 struct iscsi_cls_conn *conn, *tmp;
2493 unsigned long flags;
2494 LIST_HEAD(recovery_list);
2495
2496 spin_lock_irqsave(&connlock, flags);
2497 if (list_empty(&connlist_err)) {
2498 spin_unlock_irqrestore(&connlock, flags);
2499 return;
2500 }
2501 list_splice_init(&connlist_err, &recovery_list);
2502 spin_unlock_irqrestore(&connlock, flags);
2503
2504 list_for_each_entry_safe(conn, tmp, &recovery_list, conn_list_err) {
2505 uint32_t sid = iscsi_conn_get_sid(conn);
2506 struct iscsi_cls_session *session;
2507
2508 session = iscsi_session_lookup(sid);
2509 if (session) {
2510 if (system_state != SYSTEM_RUNNING) {
2511 session->recovery_tmo = 0;
2512 iscsi_if_stop_conn(conn, STOP_CONN_TERM);
2513 } else {
2514 iscsi_if_stop_conn(conn, STOP_CONN_RECOVER);
2515 }
2516 }
2517
2518 list_del_init(&conn->conn_list_err);
2519 }
2520 }
2521
iscsi_conn_error_event(struct iscsi_cls_conn * conn,enum iscsi_err error)2522 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2523 {
2524 struct nlmsghdr *nlh;
2525 struct sk_buff *skb;
2526 struct iscsi_uevent *ev;
2527 struct iscsi_internal *priv;
2528 int len = nlmsg_total_size(sizeof(*ev));
2529 unsigned long flags;
2530
2531 spin_lock_irqsave(&connlock, flags);
2532 list_add(&conn->conn_list_err, &connlist_err);
2533 spin_unlock_irqrestore(&connlock, flags);
2534 queue_work(system_unbound_wq, &stop_conn_work);
2535
2536 priv = iscsi_if_transport_lookup(conn->transport);
2537 if (!priv)
2538 return;
2539
2540 skb = alloc_skb(len, GFP_ATOMIC);
2541 if (!skb) {
2542 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2543 "conn error (%d)\n", error);
2544 return;
2545 }
2546
2547 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2548 ev = nlmsg_data(nlh);
2549 ev->transport_handle = iscsi_handle(conn->transport);
2550 ev->type = ISCSI_KEVENT_CONN_ERROR;
2551 ev->r.connerror.error = error;
2552 ev->r.connerror.cid = conn->cid;
2553 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2554
2555 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2556
2557 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2558 error);
2559 }
2560 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2561
iscsi_conn_login_event(struct iscsi_cls_conn * conn,enum iscsi_conn_state state)2562 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2563 enum iscsi_conn_state state)
2564 {
2565 struct nlmsghdr *nlh;
2566 struct sk_buff *skb;
2567 struct iscsi_uevent *ev;
2568 struct iscsi_internal *priv;
2569 int len = nlmsg_total_size(sizeof(*ev));
2570
2571 priv = iscsi_if_transport_lookup(conn->transport);
2572 if (!priv)
2573 return;
2574
2575 skb = alloc_skb(len, GFP_ATOMIC);
2576 if (!skb) {
2577 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2578 "conn login (%d)\n", state);
2579 return;
2580 }
2581
2582 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2583 ev = nlmsg_data(nlh);
2584 ev->transport_handle = iscsi_handle(conn->transport);
2585 ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2586 ev->r.conn_login.state = state;
2587 ev->r.conn_login.cid = conn->cid;
2588 ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2589 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2590
2591 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2592 state);
2593 }
2594 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2595
iscsi_post_host_event(uint32_t host_no,struct iscsi_transport * transport,enum iscsi_host_event_code code,uint32_t data_size,uint8_t * data)2596 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2597 enum iscsi_host_event_code code, uint32_t data_size,
2598 uint8_t *data)
2599 {
2600 struct nlmsghdr *nlh;
2601 struct sk_buff *skb;
2602 struct iscsi_uevent *ev;
2603 int len = nlmsg_total_size(sizeof(*ev) + data_size);
2604
2605 skb = alloc_skb(len, GFP_NOIO);
2606 if (!skb) {
2607 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2608 host_no, code);
2609 return;
2610 }
2611
2612 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2613 ev = nlmsg_data(nlh);
2614 ev->transport_handle = iscsi_handle(transport);
2615 ev->type = ISCSI_KEVENT_HOST_EVENT;
2616 ev->r.host_event.host_no = host_no;
2617 ev->r.host_event.code = code;
2618 ev->r.host_event.data_size = data_size;
2619
2620 if (data_size)
2621 memcpy((char *)ev + sizeof(*ev), data, data_size);
2622
2623 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2624 }
2625 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2626
iscsi_ping_comp_event(uint32_t host_no,struct iscsi_transport * transport,uint32_t status,uint32_t pid,uint32_t data_size,uint8_t * data)2627 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2628 uint32_t status, uint32_t pid, uint32_t data_size,
2629 uint8_t *data)
2630 {
2631 struct nlmsghdr *nlh;
2632 struct sk_buff *skb;
2633 struct iscsi_uevent *ev;
2634 int len = nlmsg_total_size(sizeof(*ev) + data_size);
2635
2636 skb = alloc_skb(len, GFP_NOIO);
2637 if (!skb) {
2638 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2639 return;
2640 }
2641
2642 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2643 ev = nlmsg_data(nlh);
2644 ev->transport_handle = iscsi_handle(transport);
2645 ev->type = ISCSI_KEVENT_PING_COMP;
2646 ev->r.ping_comp.host_no = host_no;
2647 ev->r.ping_comp.status = status;
2648 ev->r.ping_comp.pid = pid;
2649 ev->r.ping_comp.data_size = data_size;
2650 memcpy((char *)ev + sizeof(*ev), data, data_size);
2651
2652 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2653 }
2654 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2655
2656 static int
iscsi_if_send_reply(u32 portid,int type,void * payload,int size)2657 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2658 {
2659 struct sk_buff *skb;
2660 struct nlmsghdr *nlh;
2661 int len = nlmsg_total_size(size);
2662
2663 skb = alloc_skb(len, GFP_ATOMIC);
2664 if (!skb) {
2665 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2666 return -ENOMEM;
2667 }
2668
2669 nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2670 memcpy(nlmsg_data(nlh), payload, size);
2671 return iscsi_unicast_skb(skb, portid);
2672 }
2673
2674 static int
iscsi_if_get_stats(struct iscsi_transport * transport,struct nlmsghdr * nlh)2675 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2676 {
2677 struct iscsi_uevent *ev = nlmsg_data(nlh);
2678 struct iscsi_stats *stats;
2679 struct sk_buff *skbstat;
2680 struct iscsi_cls_conn *conn;
2681 struct nlmsghdr *nlhstat;
2682 struct iscsi_uevent *evstat;
2683 struct iscsi_internal *priv;
2684 int len = nlmsg_total_size(sizeof(*ev) +
2685 sizeof(struct iscsi_stats) +
2686 sizeof(struct iscsi_stats_custom) *
2687 ISCSI_STATS_CUSTOM_MAX);
2688 int err = 0;
2689
2690 priv = iscsi_if_transport_lookup(transport);
2691 if (!priv)
2692 return -EINVAL;
2693
2694 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2695 if (!conn)
2696 return -EEXIST;
2697
2698 do {
2699 int actual_size;
2700
2701 skbstat = alloc_skb(len, GFP_ATOMIC);
2702 if (!skbstat) {
2703 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2704 "deliver stats: OOM\n");
2705 return -ENOMEM;
2706 }
2707
2708 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2709 (len - sizeof(*nlhstat)), 0);
2710 evstat = nlmsg_data(nlhstat);
2711 memset(evstat, 0, sizeof(*evstat));
2712 evstat->transport_handle = iscsi_handle(conn->transport);
2713 evstat->type = nlh->nlmsg_type;
2714 evstat->u.get_stats.cid =
2715 ev->u.get_stats.cid;
2716 evstat->u.get_stats.sid =
2717 ev->u.get_stats.sid;
2718 stats = (struct iscsi_stats *)
2719 ((char*)evstat + sizeof(*evstat));
2720 memset(stats, 0, sizeof(*stats));
2721
2722 transport->get_stats(conn, stats);
2723 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2724 sizeof(struct iscsi_stats) +
2725 sizeof(struct iscsi_stats_custom) *
2726 stats->custom_length);
2727 actual_size -= sizeof(*nlhstat);
2728 actual_size = nlmsg_msg_size(actual_size);
2729 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2730 nlhstat->nlmsg_len = actual_size;
2731
2732 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2733 GFP_ATOMIC);
2734 } while (err < 0 && err != -ECONNREFUSED);
2735
2736 return err;
2737 }
2738
2739 /**
2740 * iscsi_session_event - send session destr. completion event
2741 * @session: iscsi class session
2742 * @event: type of event
2743 */
iscsi_session_event(struct iscsi_cls_session * session,enum iscsi_uevent_e event)2744 int iscsi_session_event(struct iscsi_cls_session *session,
2745 enum iscsi_uevent_e event)
2746 {
2747 struct iscsi_internal *priv;
2748 struct Scsi_Host *shost;
2749 struct iscsi_uevent *ev;
2750 struct sk_buff *skb;
2751 struct nlmsghdr *nlh;
2752 int rc, len = nlmsg_total_size(sizeof(*ev));
2753
2754 priv = iscsi_if_transport_lookup(session->transport);
2755 if (!priv)
2756 return -EINVAL;
2757 shost = iscsi_session_to_shost(session);
2758
2759 skb = alloc_skb(len, GFP_KERNEL);
2760 if (!skb) {
2761 iscsi_cls_session_printk(KERN_ERR, session,
2762 "Cannot notify userspace of session "
2763 "event %u\n", event);
2764 return -ENOMEM;
2765 }
2766
2767 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2768 ev = nlmsg_data(nlh);
2769 ev->transport_handle = iscsi_handle(session->transport);
2770
2771 ev->type = event;
2772 switch (event) {
2773 case ISCSI_KEVENT_DESTROY_SESSION:
2774 ev->r.d_session.host_no = shost->host_no;
2775 ev->r.d_session.sid = session->sid;
2776 break;
2777 case ISCSI_KEVENT_CREATE_SESSION:
2778 ev->r.c_session_ret.host_no = shost->host_no;
2779 ev->r.c_session_ret.sid = session->sid;
2780 break;
2781 case ISCSI_KEVENT_UNBIND_SESSION:
2782 ev->r.unbind_session.host_no = shost->host_no;
2783 ev->r.unbind_session.sid = session->sid;
2784 break;
2785 default:
2786 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2787 "%u.\n", event);
2788 kfree_skb(skb);
2789 return -EINVAL;
2790 }
2791
2792 /*
2793 * this will occur if the daemon is not up, so we just warn
2794 * the user and when the daemon is restarted it will handle it
2795 */
2796 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2797 if (rc == -ESRCH)
2798 iscsi_cls_session_printk(KERN_ERR, session,
2799 "Cannot notify userspace of session "
2800 "event %u. Check iscsi daemon\n",
2801 event);
2802
2803 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2804 event, rc);
2805 return rc;
2806 }
2807 EXPORT_SYMBOL_GPL(iscsi_session_event);
2808
2809 static int
iscsi_if_create_session(struct iscsi_internal * priv,struct iscsi_endpoint * ep,struct iscsi_uevent * ev,pid_t pid,uint32_t initial_cmdsn,uint16_t cmds_max,uint16_t queue_depth)2810 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2811 struct iscsi_uevent *ev, pid_t pid,
2812 uint32_t initial_cmdsn, uint16_t cmds_max,
2813 uint16_t queue_depth)
2814 {
2815 struct iscsi_transport *transport = priv->iscsi_transport;
2816 struct iscsi_cls_session *session;
2817 struct Scsi_Host *shost;
2818
2819 session = transport->create_session(ep, cmds_max, queue_depth,
2820 initial_cmdsn);
2821 if (!session)
2822 return -ENOMEM;
2823
2824 session->creator = pid;
2825 shost = iscsi_session_to_shost(session);
2826 ev->r.c_session_ret.host_no = shost->host_no;
2827 ev->r.c_session_ret.sid = session->sid;
2828 ISCSI_DBG_TRANS_SESSION(session,
2829 "Completed creating transport session\n");
2830 return 0;
2831 }
2832
2833 static int
iscsi_if_create_conn(struct iscsi_transport * transport,struct iscsi_uevent * ev)2834 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2835 {
2836 struct iscsi_cls_conn *conn;
2837 struct iscsi_cls_session *session;
2838
2839 session = iscsi_session_lookup(ev->u.c_conn.sid);
2840 if (!session) {
2841 printk(KERN_ERR "iscsi: invalid session %d.\n",
2842 ev->u.c_conn.sid);
2843 return -EINVAL;
2844 }
2845
2846 conn = transport->create_conn(session, ev->u.c_conn.cid);
2847 if (!conn) {
2848 iscsi_cls_session_printk(KERN_ERR, session,
2849 "couldn't create a new connection.");
2850 return -ENOMEM;
2851 }
2852
2853 ev->r.c_conn_ret.sid = session->sid;
2854 ev->r.c_conn_ret.cid = conn->cid;
2855
2856 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2857 return 0;
2858 }
2859
2860 static int
iscsi_if_destroy_conn(struct iscsi_transport * transport,struct iscsi_uevent * ev)2861 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2862 {
2863 struct iscsi_cls_conn *conn;
2864 unsigned long flags;
2865
2866 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2867 if (!conn)
2868 return -EINVAL;
2869
2870 spin_lock_irqsave(&connlock, flags);
2871 if (!list_empty(&conn->conn_list_err)) {
2872 spin_unlock_irqrestore(&connlock, flags);
2873 return -EAGAIN;
2874 }
2875 spin_unlock_irqrestore(&connlock, flags);
2876
2877 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2878
2879 mutex_lock(&conn_mutex);
2880 if (transport->destroy_conn)
2881 transport->destroy_conn(conn);
2882 mutex_unlock(&conn_mutex);
2883
2884 return 0;
2885 }
2886
2887 static int
iscsi_set_param(struct iscsi_transport * transport,struct iscsi_uevent * ev)2888 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2889 {
2890 char *data = (char*)ev + sizeof(*ev);
2891 struct iscsi_cls_conn *conn;
2892 struct iscsi_cls_session *session;
2893 int err = 0, value = 0;
2894
2895 if (ev->u.set_param.len > PAGE_SIZE)
2896 return -EINVAL;
2897
2898 session = iscsi_session_lookup(ev->u.set_param.sid);
2899 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2900 if (!conn || !session)
2901 return -EINVAL;
2902
2903 switch (ev->u.set_param.param) {
2904 case ISCSI_PARAM_SESS_RECOVERY_TMO:
2905 sscanf(data, "%d", &value);
2906 if (!session->recovery_tmo_sysfs_override)
2907 session->recovery_tmo = value;
2908 break;
2909 default:
2910 if ((conn->state == ISCSI_CONN_BOUND) ||
2911 (conn->state == ISCSI_CONN_UP)) {
2912 err = transport->set_param(conn, ev->u.set_param.param,
2913 data, ev->u.set_param.len);
2914 } else {
2915 return -ENOTCONN;
2916 }
2917 }
2918
2919 return err;
2920 }
2921
iscsi_if_ep_connect(struct iscsi_transport * transport,struct iscsi_uevent * ev,int msg_type)2922 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2923 struct iscsi_uevent *ev, int msg_type)
2924 {
2925 struct iscsi_endpoint *ep;
2926 struct sockaddr *dst_addr;
2927 struct Scsi_Host *shost = NULL;
2928 int non_blocking, err = 0;
2929
2930 if (!transport->ep_connect)
2931 return -EINVAL;
2932
2933 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2934 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2935 if (!shost) {
2936 printk(KERN_ERR "ep connect failed. Could not find "
2937 "host no %u\n",
2938 ev->u.ep_connect_through_host.host_no);
2939 return -ENODEV;
2940 }
2941 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2942 } else
2943 non_blocking = ev->u.ep_connect.non_blocking;
2944
2945 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2946 ep = transport->ep_connect(shost, dst_addr, non_blocking);
2947 if (IS_ERR(ep)) {
2948 err = PTR_ERR(ep);
2949 goto release_host;
2950 }
2951
2952 ev->r.ep_connect_ret.handle = ep->id;
2953 release_host:
2954 if (shost)
2955 scsi_host_put(shost);
2956 return err;
2957 }
2958
iscsi_if_ep_disconnect(struct iscsi_transport * transport,u64 ep_handle)2959 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2960 u64 ep_handle)
2961 {
2962 struct iscsi_cls_conn *conn;
2963 struct iscsi_endpoint *ep;
2964
2965 if (!transport->ep_disconnect)
2966 return -EINVAL;
2967
2968 ep = iscsi_lookup_endpoint(ep_handle);
2969 if (!ep)
2970 return -EINVAL;
2971 conn = ep->conn;
2972 if (conn) {
2973 mutex_lock(&conn->ep_mutex);
2974 conn->ep = NULL;
2975 mutex_unlock(&conn->ep_mutex);
2976 conn->state = ISCSI_CONN_FAILED;
2977 }
2978
2979 transport->ep_disconnect(ep);
2980 return 0;
2981 }
2982
2983 static int
iscsi_if_transport_ep(struct iscsi_transport * transport,struct iscsi_uevent * ev,int msg_type)2984 iscsi_if_transport_ep(struct iscsi_transport *transport,
2985 struct iscsi_uevent *ev, int msg_type)
2986 {
2987 struct iscsi_endpoint *ep;
2988 int rc = 0;
2989
2990 switch (msg_type) {
2991 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2992 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2993 rc = iscsi_if_ep_connect(transport, ev, msg_type);
2994 break;
2995 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2996 if (!transport->ep_poll)
2997 return -EINVAL;
2998
2999 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
3000 if (!ep)
3001 return -EINVAL;
3002
3003 ev->r.retcode = transport->ep_poll(ep,
3004 ev->u.ep_poll.timeout_ms);
3005 break;
3006 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3007 rc = iscsi_if_ep_disconnect(transport,
3008 ev->u.ep_disconnect.ep_handle);
3009 break;
3010 }
3011 return rc;
3012 }
3013
3014 static int
iscsi_tgt_dscvr(struct iscsi_transport * transport,struct iscsi_uevent * ev)3015 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3016 struct iscsi_uevent *ev)
3017 {
3018 struct Scsi_Host *shost;
3019 struct sockaddr *dst_addr;
3020 int err;
3021
3022 if (!transport->tgt_dscvr)
3023 return -EINVAL;
3024
3025 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3026 if (!shost) {
3027 printk(KERN_ERR "target discovery could not find host no %u\n",
3028 ev->u.tgt_dscvr.host_no);
3029 return -ENODEV;
3030 }
3031
3032
3033 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3034 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3035 ev->u.tgt_dscvr.enable, dst_addr);
3036 scsi_host_put(shost);
3037 return err;
3038 }
3039
3040 static int
iscsi_set_host_param(struct iscsi_transport * transport,struct iscsi_uevent * ev)3041 iscsi_set_host_param(struct iscsi_transport *transport,
3042 struct iscsi_uevent *ev)
3043 {
3044 char *data = (char*)ev + sizeof(*ev);
3045 struct Scsi_Host *shost;
3046 int err;
3047
3048 if (!transport->set_host_param)
3049 return -ENOSYS;
3050
3051 if (ev->u.set_host_param.len > PAGE_SIZE)
3052 return -EINVAL;
3053
3054 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3055 if (!shost) {
3056 printk(KERN_ERR "set_host_param could not find host no %u\n",
3057 ev->u.set_host_param.host_no);
3058 return -ENODEV;
3059 }
3060
3061 err = transport->set_host_param(shost, ev->u.set_host_param.param,
3062 data, ev->u.set_host_param.len);
3063 scsi_host_put(shost);
3064 return err;
3065 }
3066
3067 static int
iscsi_set_path(struct iscsi_transport * transport,struct iscsi_uevent * ev)3068 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3069 {
3070 struct Scsi_Host *shost;
3071 struct iscsi_path *params;
3072 int err;
3073
3074 if (!transport->set_path)
3075 return -ENOSYS;
3076
3077 shost = scsi_host_lookup(ev->u.set_path.host_no);
3078 if (!shost) {
3079 printk(KERN_ERR "set path could not find host no %u\n",
3080 ev->u.set_path.host_no);
3081 return -ENODEV;
3082 }
3083
3084 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3085 err = transport->set_path(shost, params);
3086
3087 scsi_host_put(shost);
3088 return err;
3089 }
3090
iscsi_session_has_conns(int sid)3091 static int iscsi_session_has_conns(int sid)
3092 {
3093 struct iscsi_cls_conn *conn;
3094 unsigned long flags;
3095 int found = 0;
3096
3097 spin_lock_irqsave(&connlock, flags);
3098 list_for_each_entry(conn, &connlist, conn_list) {
3099 if (iscsi_conn_get_sid(conn) == sid) {
3100 found = 1;
3101 break;
3102 }
3103 }
3104 spin_unlock_irqrestore(&connlock, flags);
3105
3106 return found;
3107 }
3108
3109 static int
iscsi_set_iface_params(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3110 iscsi_set_iface_params(struct iscsi_transport *transport,
3111 struct iscsi_uevent *ev, uint32_t len)
3112 {
3113 char *data = (char *)ev + sizeof(*ev);
3114 struct Scsi_Host *shost;
3115 int err;
3116
3117 if (!transport->set_iface_param)
3118 return -ENOSYS;
3119
3120 shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3121 if (!shost) {
3122 printk(KERN_ERR "set_iface_params could not find host no %u\n",
3123 ev->u.set_iface_params.host_no);
3124 return -ENODEV;
3125 }
3126
3127 err = transport->set_iface_param(shost, data, len);
3128 scsi_host_put(shost);
3129 return err;
3130 }
3131
3132 static int
iscsi_send_ping(struct iscsi_transport * transport,struct iscsi_uevent * ev)3133 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3134 {
3135 struct Scsi_Host *shost;
3136 struct sockaddr *dst_addr;
3137 int err;
3138
3139 if (!transport->send_ping)
3140 return -ENOSYS;
3141
3142 shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3143 if (!shost) {
3144 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3145 ev->u.iscsi_ping.host_no);
3146 return -ENODEV;
3147 }
3148
3149 dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3150 err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3151 ev->u.iscsi_ping.iface_type,
3152 ev->u.iscsi_ping.payload_size,
3153 ev->u.iscsi_ping.pid,
3154 dst_addr);
3155 scsi_host_put(shost);
3156 return err;
3157 }
3158
3159 static int
iscsi_get_chap(struct iscsi_transport * transport,struct nlmsghdr * nlh)3160 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3161 {
3162 struct iscsi_uevent *ev = nlmsg_data(nlh);
3163 struct Scsi_Host *shost = NULL;
3164 struct iscsi_chap_rec *chap_rec;
3165 struct iscsi_internal *priv;
3166 struct sk_buff *skbchap;
3167 struct nlmsghdr *nlhchap;
3168 struct iscsi_uevent *evchap;
3169 uint32_t chap_buf_size;
3170 int len, err = 0;
3171 char *buf;
3172
3173 if (!transport->get_chap)
3174 return -EINVAL;
3175
3176 priv = iscsi_if_transport_lookup(transport);
3177 if (!priv)
3178 return -EINVAL;
3179
3180 chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3181 len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3182
3183 shost = scsi_host_lookup(ev->u.get_chap.host_no);
3184 if (!shost) {
3185 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3186 __func__, ev->u.get_chap.host_no);
3187 return -ENODEV;
3188 }
3189
3190 do {
3191 int actual_size;
3192
3193 skbchap = alloc_skb(len, GFP_KERNEL);
3194 if (!skbchap) {
3195 printk(KERN_ERR "can not deliver chap: OOM\n");
3196 err = -ENOMEM;
3197 goto exit_get_chap;
3198 }
3199
3200 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3201 (len - sizeof(*nlhchap)), 0);
3202 evchap = nlmsg_data(nlhchap);
3203 memset(evchap, 0, sizeof(*evchap));
3204 evchap->transport_handle = iscsi_handle(transport);
3205 evchap->type = nlh->nlmsg_type;
3206 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3207 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3208 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3209 buf = (char *)evchap + sizeof(*evchap);
3210 memset(buf, 0, chap_buf_size);
3211
3212 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3213 &evchap->u.get_chap.num_entries, buf);
3214
3215 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3216 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3217 nlhchap->nlmsg_len = actual_size;
3218
3219 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3220 GFP_KERNEL);
3221 } while (err < 0 && err != -ECONNREFUSED);
3222
3223 exit_get_chap:
3224 scsi_host_put(shost);
3225 return err;
3226 }
3227
iscsi_set_chap(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3228 static int iscsi_set_chap(struct iscsi_transport *transport,
3229 struct iscsi_uevent *ev, uint32_t len)
3230 {
3231 char *data = (char *)ev + sizeof(*ev);
3232 struct Scsi_Host *shost;
3233 int err = 0;
3234
3235 if (!transport->set_chap)
3236 return -ENOSYS;
3237
3238 shost = scsi_host_lookup(ev->u.set_path.host_no);
3239 if (!shost) {
3240 pr_err("%s could not find host no %u\n",
3241 __func__, ev->u.set_path.host_no);
3242 return -ENODEV;
3243 }
3244
3245 err = transport->set_chap(shost, data, len);
3246 scsi_host_put(shost);
3247 return err;
3248 }
3249
iscsi_delete_chap(struct iscsi_transport * transport,struct iscsi_uevent * ev)3250 static int iscsi_delete_chap(struct iscsi_transport *transport,
3251 struct iscsi_uevent *ev)
3252 {
3253 struct Scsi_Host *shost;
3254 int err = 0;
3255
3256 if (!transport->delete_chap)
3257 return -ENOSYS;
3258
3259 shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3260 if (!shost) {
3261 printk(KERN_ERR "%s could not find host no %u\n",
3262 __func__, ev->u.delete_chap.host_no);
3263 return -ENODEV;
3264 }
3265
3266 err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3267 scsi_host_put(shost);
3268 return err;
3269 }
3270
3271 static const struct {
3272 enum iscsi_discovery_parent_type value;
3273 char *name;
3274 } iscsi_discovery_parent_names[] = {
3275 {ISCSI_DISC_PARENT_UNKNOWN, "Unknown" },
3276 {ISCSI_DISC_PARENT_SENDTGT, "Sendtarget" },
3277 {ISCSI_DISC_PARENT_ISNS, "isns" },
3278 };
3279
iscsi_get_discovery_parent_name(int parent_type)3280 char *iscsi_get_discovery_parent_name(int parent_type)
3281 {
3282 int i;
3283 char *state = "Unknown!";
3284
3285 for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3286 if (iscsi_discovery_parent_names[i].value & parent_type) {
3287 state = iscsi_discovery_parent_names[i].name;
3288 break;
3289 }
3290 }
3291 return state;
3292 }
3293 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3294
iscsi_set_flashnode_param(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3295 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3296 struct iscsi_uevent *ev, uint32_t len)
3297 {
3298 char *data = (char *)ev + sizeof(*ev);
3299 struct Scsi_Host *shost;
3300 struct iscsi_bus_flash_session *fnode_sess;
3301 struct iscsi_bus_flash_conn *fnode_conn;
3302 struct device *dev;
3303 uint32_t idx;
3304 int err = 0;
3305
3306 if (!transport->set_flashnode_param) {
3307 err = -ENOSYS;
3308 goto exit_set_fnode;
3309 }
3310
3311 shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3312 if (!shost) {
3313 pr_err("%s could not find host no %u\n",
3314 __func__, ev->u.set_flashnode.host_no);
3315 err = -ENODEV;
3316 goto exit_set_fnode;
3317 }
3318
3319 idx = ev->u.set_flashnode.flashnode_idx;
3320 fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3321 if (!fnode_sess) {
3322 pr_err("%s could not find flashnode %u for host no %u\n",
3323 __func__, idx, ev->u.set_flashnode.host_no);
3324 err = -ENODEV;
3325 goto put_host;
3326 }
3327
3328 dev = iscsi_find_flashnode_conn(fnode_sess);
3329 if (!dev) {
3330 err = -ENODEV;
3331 goto put_sess;
3332 }
3333
3334 fnode_conn = iscsi_dev_to_flash_conn(dev);
3335 err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3336 put_device(dev);
3337
3338 put_sess:
3339 put_device(&fnode_sess->dev);
3340
3341 put_host:
3342 scsi_host_put(shost);
3343
3344 exit_set_fnode:
3345 return err;
3346 }
3347
iscsi_new_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev,uint32_t len)3348 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3349 struct iscsi_uevent *ev, uint32_t len)
3350 {
3351 char *data = (char *)ev + sizeof(*ev);
3352 struct Scsi_Host *shost;
3353 int index;
3354 int err = 0;
3355
3356 if (!transport->new_flashnode) {
3357 err = -ENOSYS;
3358 goto exit_new_fnode;
3359 }
3360
3361 shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3362 if (!shost) {
3363 pr_err("%s could not find host no %u\n",
3364 __func__, ev->u.new_flashnode.host_no);
3365 err = -ENODEV;
3366 goto put_host;
3367 }
3368
3369 index = transport->new_flashnode(shost, data, len);
3370
3371 if (index >= 0)
3372 ev->r.new_flashnode_ret.flashnode_idx = index;
3373 else
3374 err = -EIO;
3375
3376 put_host:
3377 scsi_host_put(shost);
3378
3379 exit_new_fnode:
3380 return err;
3381 }
3382
iscsi_del_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3383 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3384 struct iscsi_uevent *ev)
3385 {
3386 struct Scsi_Host *shost;
3387 struct iscsi_bus_flash_session *fnode_sess;
3388 uint32_t idx;
3389 int err = 0;
3390
3391 if (!transport->del_flashnode) {
3392 err = -ENOSYS;
3393 goto exit_del_fnode;
3394 }
3395
3396 shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3397 if (!shost) {
3398 pr_err("%s could not find host no %u\n",
3399 __func__, ev->u.del_flashnode.host_no);
3400 err = -ENODEV;
3401 goto put_host;
3402 }
3403
3404 idx = ev->u.del_flashnode.flashnode_idx;
3405 fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3406 if (!fnode_sess) {
3407 pr_err("%s could not find flashnode %u for host no %u\n",
3408 __func__, idx, ev->u.del_flashnode.host_no);
3409 err = -ENODEV;
3410 goto put_host;
3411 }
3412
3413 err = transport->del_flashnode(fnode_sess);
3414 put_device(&fnode_sess->dev);
3415
3416 put_host:
3417 scsi_host_put(shost);
3418
3419 exit_del_fnode:
3420 return err;
3421 }
3422
iscsi_login_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3423 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3424 struct iscsi_uevent *ev)
3425 {
3426 struct Scsi_Host *shost;
3427 struct iscsi_bus_flash_session *fnode_sess;
3428 struct iscsi_bus_flash_conn *fnode_conn;
3429 struct device *dev;
3430 uint32_t idx;
3431 int err = 0;
3432
3433 if (!transport->login_flashnode) {
3434 err = -ENOSYS;
3435 goto exit_login_fnode;
3436 }
3437
3438 shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3439 if (!shost) {
3440 pr_err("%s could not find host no %u\n",
3441 __func__, ev->u.login_flashnode.host_no);
3442 err = -ENODEV;
3443 goto put_host;
3444 }
3445
3446 idx = ev->u.login_flashnode.flashnode_idx;
3447 fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3448 if (!fnode_sess) {
3449 pr_err("%s could not find flashnode %u for host no %u\n",
3450 __func__, idx, ev->u.login_flashnode.host_no);
3451 err = -ENODEV;
3452 goto put_host;
3453 }
3454
3455 dev = iscsi_find_flashnode_conn(fnode_sess);
3456 if (!dev) {
3457 err = -ENODEV;
3458 goto put_sess;
3459 }
3460
3461 fnode_conn = iscsi_dev_to_flash_conn(dev);
3462 err = transport->login_flashnode(fnode_sess, fnode_conn);
3463 put_device(dev);
3464
3465 put_sess:
3466 put_device(&fnode_sess->dev);
3467
3468 put_host:
3469 scsi_host_put(shost);
3470
3471 exit_login_fnode:
3472 return err;
3473 }
3474
iscsi_logout_flashnode(struct iscsi_transport * transport,struct iscsi_uevent * ev)3475 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3476 struct iscsi_uevent *ev)
3477 {
3478 struct Scsi_Host *shost;
3479 struct iscsi_bus_flash_session *fnode_sess;
3480 struct iscsi_bus_flash_conn *fnode_conn;
3481 struct device *dev;
3482 uint32_t idx;
3483 int err = 0;
3484
3485 if (!transport->logout_flashnode) {
3486 err = -ENOSYS;
3487 goto exit_logout_fnode;
3488 }
3489
3490 shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3491 if (!shost) {
3492 pr_err("%s could not find host no %u\n",
3493 __func__, ev->u.logout_flashnode.host_no);
3494 err = -ENODEV;
3495 goto put_host;
3496 }
3497
3498 idx = ev->u.logout_flashnode.flashnode_idx;
3499 fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3500 if (!fnode_sess) {
3501 pr_err("%s could not find flashnode %u for host no %u\n",
3502 __func__, idx, ev->u.logout_flashnode.host_no);
3503 err = -ENODEV;
3504 goto put_host;
3505 }
3506
3507 dev = iscsi_find_flashnode_conn(fnode_sess);
3508 if (!dev) {
3509 err = -ENODEV;
3510 goto put_sess;
3511 }
3512
3513 fnode_conn = iscsi_dev_to_flash_conn(dev);
3514
3515 err = transport->logout_flashnode(fnode_sess, fnode_conn);
3516 put_device(dev);
3517
3518 put_sess:
3519 put_device(&fnode_sess->dev);
3520
3521 put_host:
3522 scsi_host_put(shost);
3523
3524 exit_logout_fnode:
3525 return err;
3526 }
3527
iscsi_logout_flashnode_sid(struct iscsi_transport * transport,struct iscsi_uevent * ev)3528 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3529 struct iscsi_uevent *ev)
3530 {
3531 struct Scsi_Host *shost;
3532 struct iscsi_cls_session *session;
3533 int err = 0;
3534
3535 if (!transport->logout_flashnode_sid) {
3536 err = -ENOSYS;
3537 goto exit_logout_sid;
3538 }
3539
3540 shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3541 if (!shost) {
3542 pr_err("%s could not find host no %u\n",
3543 __func__, ev->u.logout_flashnode.host_no);
3544 err = -ENODEV;
3545 goto put_host;
3546 }
3547
3548 session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3549 if (!session) {
3550 pr_err("%s could not find session id %u\n",
3551 __func__, ev->u.logout_flashnode_sid.sid);
3552 err = -EINVAL;
3553 goto put_host;
3554 }
3555
3556 err = transport->logout_flashnode_sid(session);
3557
3558 put_host:
3559 scsi_host_put(shost);
3560
3561 exit_logout_sid:
3562 return err;
3563 }
3564
3565 static int
iscsi_get_host_stats(struct iscsi_transport * transport,struct nlmsghdr * nlh)3566 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3567 {
3568 struct iscsi_uevent *ev = nlmsg_data(nlh);
3569 struct Scsi_Host *shost = NULL;
3570 struct iscsi_internal *priv;
3571 struct sk_buff *skbhost_stats;
3572 struct nlmsghdr *nlhhost_stats;
3573 struct iscsi_uevent *evhost_stats;
3574 int host_stats_size = 0;
3575 int len, err = 0;
3576 char *buf;
3577
3578 if (!transport->get_host_stats)
3579 return -ENOSYS;
3580
3581 priv = iscsi_if_transport_lookup(transport);
3582 if (!priv)
3583 return -EINVAL;
3584
3585 host_stats_size = sizeof(struct iscsi_offload_host_stats);
3586 len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3587
3588 shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3589 if (!shost) {
3590 pr_err("%s: failed. Could not find host no %u\n",
3591 __func__, ev->u.get_host_stats.host_no);
3592 return -ENODEV;
3593 }
3594
3595 do {
3596 int actual_size;
3597
3598 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3599 if (!skbhost_stats) {
3600 pr_err("cannot deliver host stats: OOM\n");
3601 err = -ENOMEM;
3602 goto exit_host_stats;
3603 }
3604
3605 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3606 (len - sizeof(*nlhhost_stats)), 0);
3607 evhost_stats = nlmsg_data(nlhhost_stats);
3608 memset(evhost_stats, 0, sizeof(*evhost_stats));
3609 evhost_stats->transport_handle = iscsi_handle(transport);
3610 evhost_stats->type = nlh->nlmsg_type;
3611 evhost_stats->u.get_host_stats.host_no =
3612 ev->u.get_host_stats.host_no;
3613 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3614 memset(buf, 0, host_stats_size);
3615
3616 err = transport->get_host_stats(shost, buf, host_stats_size);
3617 if (err) {
3618 kfree_skb(skbhost_stats);
3619 goto exit_host_stats;
3620 }
3621
3622 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3623 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3624 nlhhost_stats->nlmsg_len = actual_size;
3625
3626 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3627 GFP_KERNEL);
3628 } while (err < 0 && err != -ECONNREFUSED);
3629
3630 exit_host_stats:
3631 scsi_host_put(shost);
3632 return err;
3633 }
3634
3635
3636 static int
iscsi_if_recv_msg(struct sk_buff * skb,struct nlmsghdr * nlh,uint32_t * group)3637 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3638 {
3639 int err = 0;
3640 u32 portid;
3641 u32 pdu_len;
3642 struct iscsi_uevent *ev = nlmsg_data(nlh);
3643 struct iscsi_transport *transport = NULL;
3644 struct iscsi_internal *priv;
3645 struct iscsi_cls_session *session;
3646 struct iscsi_cls_conn *conn;
3647 struct iscsi_endpoint *ep = NULL;
3648
3649 if (!netlink_capable(skb, CAP_SYS_ADMIN))
3650 return -EPERM;
3651
3652 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3653 *group = ISCSI_NL_GRP_UIP;
3654 else
3655 *group = ISCSI_NL_GRP_ISCSID;
3656
3657 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3658 if (!priv)
3659 return -EINVAL;
3660 transport = priv->iscsi_transport;
3661
3662 if (!try_module_get(transport->owner))
3663 return -EINVAL;
3664
3665 portid = NETLINK_CB(skb).portid;
3666
3667 switch (nlh->nlmsg_type) {
3668 case ISCSI_UEVENT_CREATE_SESSION:
3669 err = iscsi_if_create_session(priv, ep, ev,
3670 portid,
3671 ev->u.c_session.initial_cmdsn,
3672 ev->u.c_session.cmds_max,
3673 ev->u.c_session.queue_depth);
3674 break;
3675 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3676 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3677 if (!ep) {
3678 err = -EINVAL;
3679 break;
3680 }
3681
3682 err = iscsi_if_create_session(priv, ep, ev,
3683 portid,
3684 ev->u.c_bound_session.initial_cmdsn,
3685 ev->u.c_bound_session.cmds_max,
3686 ev->u.c_bound_session.queue_depth);
3687 break;
3688 case ISCSI_UEVENT_DESTROY_SESSION:
3689 session = iscsi_session_lookup(ev->u.d_session.sid);
3690 if (!session)
3691 err = -EINVAL;
3692 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3693 err = -EBUSY;
3694 else
3695 transport->destroy_session(session);
3696 break;
3697 case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3698 session = iscsi_session_lookup(ev->u.d_session.sid);
3699 if (!session)
3700 err = -EINVAL;
3701 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3702 err = -EBUSY;
3703 else {
3704 unsigned long flags;
3705
3706 /* Prevent this session from being found again */
3707 spin_lock_irqsave(&sesslock, flags);
3708 list_del_init(&session->sess_list);
3709 spin_unlock_irqrestore(&sesslock, flags);
3710
3711 queue_work(iscsi_destroy_workq, &session->destroy_work);
3712 }
3713 break;
3714 case ISCSI_UEVENT_UNBIND_SESSION:
3715 session = iscsi_session_lookup(ev->u.d_session.sid);
3716 if (session)
3717 scsi_queue_work(iscsi_session_to_shost(session),
3718 &session->unbind_work);
3719 else
3720 err = -EINVAL;
3721 break;
3722 case ISCSI_UEVENT_CREATE_CONN:
3723 err = iscsi_if_create_conn(transport, ev);
3724 break;
3725 case ISCSI_UEVENT_DESTROY_CONN:
3726 err = iscsi_if_destroy_conn(transport, ev);
3727 break;
3728 case ISCSI_UEVENT_BIND_CONN:
3729 session = iscsi_session_lookup(ev->u.b_conn.sid);
3730 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3731
3732 if (conn && conn->ep)
3733 iscsi_if_ep_disconnect(transport, conn->ep->id);
3734
3735 if (!session || !conn) {
3736 err = -EINVAL;
3737 break;
3738 }
3739
3740 mutex_lock(&conn_mutex);
3741 ev->r.retcode = transport->bind_conn(session, conn,
3742 ev->u.b_conn.transport_eph,
3743 ev->u.b_conn.is_leading);
3744 if (!ev->r.retcode)
3745 conn->state = ISCSI_CONN_BOUND;
3746 mutex_unlock(&conn_mutex);
3747
3748 if (ev->r.retcode || !transport->ep_connect)
3749 break;
3750
3751 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3752 if (ep) {
3753 ep->conn = conn;
3754
3755 mutex_lock(&conn->ep_mutex);
3756 conn->ep = ep;
3757 mutex_unlock(&conn->ep_mutex);
3758 } else
3759 iscsi_cls_conn_printk(KERN_ERR, conn,
3760 "Could not set ep conn "
3761 "binding\n");
3762 break;
3763 case ISCSI_UEVENT_SET_PARAM:
3764 err = iscsi_set_param(transport, ev);
3765 break;
3766 case ISCSI_UEVENT_START_CONN:
3767 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3768 if (conn) {
3769 mutex_lock(&conn_mutex);
3770 ev->r.retcode = transport->start_conn(conn);
3771 if (!ev->r.retcode)
3772 conn->state = ISCSI_CONN_UP;
3773 mutex_unlock(&conn_mutex);
3774 }
3775 else
3776 err = -EINVAL;
3777 break;
3778 case ISCSI_UEVENT_STOP_CONN:
3779 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3780 if (conn)
3781 iscsi_if_stop_conn(conn, ev->u.stop_conn.flag);
3782 else
3783 err = -EINVAL;
3784 break;
3785 case ISCSI_UEVENT_SEND_PDU:
3786 pdu_len = nlh->nlmsg_len - sizeof(*nlh) - sizeof(*ev);
3787
3788 if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3789 (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3790 err = -EINVAL;
3791 break;
3792 }
3793
3794 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3795 if (conn) {
3796 mutex_lock(&conn_mutex);
3797 ev->r.retcode = transport->send_pdu(conn,
3798 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3799 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3800 ev->u.send_pdu.data_size);
3801 mutex_unlock(&conn_mutex);
3802 }
3803 else
3804 err = -EINVAL;
3805 break;
3806 case ISCSI_UEVENT_GET_STATS:
3807 err = iscsi_if_get_stats(transport, nlh);
3808 break;
3809 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3810 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3811 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3812 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3813 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3814 break;
3815 case ISCSI_UEVENT_TGT_DSCVR:
3816 err = iscsi_tgt_dscvr(transport, ev);
3817 break;
3818 case ISCSI_UEVENT_SET_HOST_PARAM:
3819 err = iscsi_set_host_param(transport, ev);
3820 break;
3821 case ISCSI_UEVENT_PATH_UPDATE:
3822 err = iscsi_set_path(transport, ev);
3823 break;
3824 case ISCSI_UEVENT_SET_IFACE_PARAMS:
3825 err = iscsi_set_iface_params(transport, ev,
3826 nlmsg_attrlen(nlh, sizeof(*ev)));
3827 break;
3828 case ISCSI_UEVENT_PING:
3829 err = iscsi_send_ping(transport, ev);
3830 break;
3831 case ISCSI_UEVENT_GET_CHAP:
3832 err = iscsi_get_chap(transport, nlh);
3833 break;
3834 case ISCSI_UEVENT_DELETE_CHAP:
3835 err = iscsi_delete_chap(transport, ev);
3836 break;
3837 case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3838 err = iscsi_set_flashnode_param(transport, ev,
3839 nlmsg_attrlen(nlh,
3840 sizeof(*ev)));
3841 break;
3842 case ISCSI_UEVENT_NEW_FLASHNODE:
3843 err = iscsi_new_flashnode(transport, ev,
3844 nlmsg_attrlen(nlh, sizeof(*ev)));
3845 break;
3846 case ISCSI_UEVENT_DEL_FLASHNODE:
3847 err = iscsi_del_flashnode(transport, ev);
3848 break;
3849 case ISCSI_UEVENT_LOGIN_FLASHNODE:
3850 err = iscsi_login_flashnode(transport, ev);
3851 break;
3852 case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3853 err = iscsi_logout_flashnode(transport, ev);
3854 break;
3855 case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3856 err = iscsi_logout_flashnode_sid(transport, ev);
3857 break;
3858 case ISCSI_UEVENT_SET_CHAP:
3859 err = iscsi_set_chap(transport, ev,
3860 nlmsg_attrlen(nlh, sizeof(*ev)));
3861 break;
3862 case ISCSI_UEVENT_GET_HOST_STATS:
3863 err = iscsi_get_host_stats(transport, nlh);
3864 break;
3865 default:
3866 err = -ENOSYS;
3867 break;
3868 }
3869
3870 module_put(transport->owner);
3871 return err;
3872 }
3873
3874 /*
3875 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
3876 * Malformed skbs with wrong lengths or invalid creds are not processed.
3877 */
3878 static void
iscsi_if_rx(struct sk_buff * skb)3879 iscsi_if_rx(struct sk_buff *skb)
3880 {
3881 u32 portid = NETLINK_CB(skb).portid;
3882
3883 mutex_lock(&rx_queue_mutex);
3884 while (skb->len >= NLMSG_HDRLEN) {
3885 int err;
3886 uint32_t rlen;
3887 struct nlmsghdr *nlh;
3888 struct iscsi_uevent *ev;
3889 uint32_t group;
3890 int retries = ISCSI_SEND_MAX_ALLOWED;
3891
3892 nlh = nlmsg_hdr(skb);
3893 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3894 skb->len < nlh->nlmsg_len) {
3895 break;
3896 }
3897
3898 ev = nlmsg_data(nlh);
3899 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3900 if (rlen > skb->len)
3901 rlen = skb->len;
3902
3903 err = iscsi_if_recv_msg(skb, nlh, &group);
3904 if (err) {
3905 ev->type = ISCSI_KEVENT_IF_ERROR;
3906 ev->iferror = err;
3907 }
3908 do {
3909 /*
3910 * special case for GET_STATS:
3911 * on success - sending reply and stats from
3912 * inside of if_recv_msg(),
3913 * on error - fall through.
3914 */
3915 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3916 break;
3917 if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3918 break;
3919 err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
3920 ev, sizeof(*ev));
3921 if (err == -EAGAIN && --retries < 0) {
3922 printk(KERN_WARNING "Send reply failed, error %d\n", err);
3923 break;
3924 }
3925 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3926 skb_pull(skb, rlen);
3927 }
3928 mutex_unlock(&rx_queue_mutex);
3929 }
3930
3931 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
3932 struct device_attribute dev_attr_##_prefix##_##_name = \
3933 __ATTR(_name,_mode,_show,_store)
3934
3935 /*
3936 * iSCSI connection attrs
3937 */
3938 #define iscsi_conn_attr_show(param) \
3939 static ssize_t \
3940 show_conn_param_##param(struct device *dev, \
3941 struct device_attribute *attr, char *buf) \
3942 { \
3943 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
3944 struct iscsi_transport *t = conn->transport; \
3945 return t->get_conn_param(conn, param, buf); \
3946 }
3947
3948 #define iscsi_conn_attr(field, param) \
3949 iscsi_conn_attr_show(param) \
3950 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
3951 NULL);
3952
3953 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3954 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3955 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3956 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3957 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3958 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3959 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3960 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3961 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3962 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3963 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3964 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3965 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3966 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3967 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3968 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3969 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3970 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3971 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3972 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3973 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3974 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3975 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3976 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3977 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3978 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3979 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3980 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3981
3982 static const char *const connection_state_names[] = {
3983 [ISCSI_CONN_UP] = "up",
3984 [ISCSI_CONN_DOWN] = "down",
3985 [ISCSI_CONN_FAILED] = "failed",
3986 [ISCSI_CONN_BOUND] = "bound"
3987 };
3988
show_conn_state(struct device * dev,struct device_attribute * attr,char * buf)3989 static ssize_t show_conn_state(struct device *dev,
3990 struct device_attribute *attr, char *buf)
3991 {
3992 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
3993 const char *state = "unknown";
3994
3995 if (conn->state >= 0 &&
3996 conn->state < ARRAY_SIZE(connection_state_names))
3997 state = connection_state_names[conn->state];
3998
3999 return sysfs_emit(buf, "%s\n", state);
4000 }
4001 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
4002 NULL);
4003
4004 #define iscsi_conn_ep_attr_show(param) \
4005 static ssize_t show_conn_ep_param_##param(struct device *dev, \
4006 struct device_attribute *attr,\
4007 char *buf) \
4008 { \
4009 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
4010 struct iscsi_transport *t = conn->transport; \
4011 struct iscsi_endpoint *ep; \
4012 ssize_t rc; \
4013 \
4014 /* \
4015 * Need to make sure ep_disconnect does not free the LLD's \
4016 * interconnect resources while we are trying to read them. \
4017 */ \
4018 mutex_lock(&conn->ep_mutex); \
4019 ep = conn->ep; \
4020 if (!ep && t->ep_connect) { \
4021 mutex_unlock(&conn->ep_mutex); \
4022 return -ENOTCONN; \
4023 } \
4024 \
4025 if (ep) \
4026 rc = t->get_ep_param(ep, param, buf); \
4027 else \
4028 rc = t->get_conn_param(conn, param, buf); \
4029 mutex_unlock(&conn->ep_mutex); \
4030 return rc; \
4031 }
4032
4033 #define iscsi_conn_ep_attr(field, param) \
4034 iscsi_conn_ep_attr_show(param) \
4035 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
4036 show_conn_ep_param_##param, NULL);
4037
4038 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4039 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4040
4041 static struct attribute *iscsi_conn_attrs[] = {
4042 &dev_attr_conn_max_recv_dlength.attr,
4043 &dev_attr_conn_max_xmit_dlength.attr,
4044 &dev_attr_conn_header_digest.attr,
4045 &dev_attr_conn_data_digest.attr,
4046 &dev_attr_conn_ifmarker.attr,
4047 &dev_attr_conn_ofmarker.attr,
4048 &dev_attr_conn_address.attr,
4049 &dev_attr_conn_port.attr,
4050 &dev_attr_conn_exp_statsn.attr,
4051 &dev_attr_conn_persistent_address.attr,
4052 &dev_attr_conn_persistent_port.attr,
4053 &dev_attr_conn_ping_tmo.attr,
4054 &dev_attr_conn_recv_tmo.attr,
4055 &dev_attr_conn_local_port.attr,
4056 &dev_attr_conn_statsn.attr,
4057 &dev_attr_conn_keepalive_tmo.attr,
4058 &dev_attr_conn_max_segment_size.attr,
4059 &dev_attr_conn_tcp_timestamp_stat.attr,
4060 &dev_attr_conn_tcp_wsf_disable.attr,
4061 &dev_attr_conn_tcp_nagle_disable.attr,
4062 &dev_attr_conn_tcp_timer_scale.attr,
4063 &dev_attr_conn_tcp_timestamp_enable.attr,
4064 &dev_attr_conn_fragment_disable.attr,
4065 &dev_attr_conn_ipv4_tos.attr,
4066 &dev_attr_conn_ipv6_traffic_class.attr,
4067 &dev_attr_conn_ipv6_flow_label.attr,
4068 &dev_attr_conn_is_fw_assigned_ipv6.attr,
4069 &dev_attr_conn_tcp_xmit_wsf.attr,
4070 &dev_attr_conn_tcp_recv_wsf.attr,
4071 &dev_attr_conn_local_ipaddr.attr,
4072 &dev_attr_conn_state.attr,
4073 NULL,
4074 };
4075
iscsi_conn_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4076 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4077 struct attribute *attr, int i)
4078 {
4079 struct device *cdev = container_of(kobj, struct device, kobj);
4080 struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4081 struct iscsi_transport *t = conn->transport;
4082 int param;
4083
4084 if (attr == &dev_attr_conn_max_recv_dlength.attr)
4085 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4086 else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4087 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4088 else if (attr == &dev_attr_conn_header_digest.attr)
4089 param = ISCSI_PARAM_HDRDGST_EN;
4090 else if (attr == &dev_attr_conn_data_digest.attr)
4091 param = ISCSI_PARAM_DATADGST_EN;
4092 else if (attr == &dev_attr_conn_ifmarker.attr)
4093 param = ISCSI_PARAM_IFMARKER_EN;
4094 else if (attr == &dev_attr_conn_ofmarker.attr)
4095 param = ISCSI_PARAM_OFMARKER_EN;
4096 else if (attr == &dev_attr_conn_address.attr)
4097 param = ISCSI_PARAM_CONN_ADDRESS;
4098 else if (attr == &dev_attr_conn_port.attr)
4099 param = ISCSI_PARAM_CONN_PORT;
4100 else if (attr == &dev_attr_conn_exp_statsn.attr)
4101 param = ISCSI_PARAM_EXP_STATSN;
4102 else if (attr == &dev_attr_conn_persistent_address.attr)
4103 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4104 else if (attr == &dev_attr_conn_persistent_port.attr)
4105 param = ISCSI_PARAM_PERSISTENT_PORT;
4106 else if (attr == &dev_attr_conn_ping_tmo.attr)
4107 param = ISCSI_PARAM_PING_TMO;
4108 else if (attr == &dev_attr_conn_recv_tmo.attr)
4109 param = ISCSI_PARAM_RECV_TMO;
4110 else if (attr == &dev_attr_conn_local_port.attr)
4111 param = ISCSI_PARAM_LOCAL_PORT;
4112 else if (attr == &dev_attr_conn_statsn.attr)
4113 param = ISCSI_PARAM_STATSN;
4114 else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4115 param = ISCSI_PARAM_KEEPALIVE_TMO;
4116 else if (attr == &dev_attr_conn_max_segment_size.attr)
4117 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4118 else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4119 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4120 else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4121 param = ISCSI_PARAM_TCP_WSF_DISABLE;
4122 else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4123 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4124 else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4125 param = ISCSI_PARAM_TCP_TIMER_SCALE;
4126 else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4127 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4128 else if (attr == &dev_attr_conn_fragment_disable.attr)
4129 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4130 else if (attr == &dev_attr_conn_ipv4_tos.attr)
4131 param = ISCSI_PARAM_IPV4_TOS;
4132 else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4133 param = ISCSI_PARAM_IPV6_TC;
4134 else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4135 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4136 else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4137 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4138 else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4139 param = ISCSI_PARAM_TCP_XMIT_WSF;
4140 else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4141 param = ISCSI_PARAM_TCP_RECV_WSF;
4142 else if (attr == &dev_attr_conn_local_ipaddr.attr)
4143 param = ISCSI_PARAM_LOCAL_IPADDR;
4144 else if (attr == &dev_attr_conn_state.attr)
4145 return S_IRUGO;
4146 else {
4147 WARN_ONCE(1, "Invalid conn attr");
4148 return 0;
4149 }
4150
4151 return t->attr_is_visible(ISCSI_PARAM, param);
4152 }
4153
4154 static struct attribute_group iscsi_conn_group = {
4155 .attrs = iscsi_conn_attrs,
4156 .is_visible = iscsi_conn_attr_is_visible,
4157 };
4158
4159 /*
4160 * iSCSI session attrs
4161 */
4162 #define iscsi_session_attr_show(param, perm) \
4163 static ssize_t \
4164 show_session_param_##param(struct device *dev, \
4165 struct device_attribute *attr, char *buf) \
4166 { \
4167 struct iscsi_cls_session *session = \
4168 iscsi_dev_to_session(dev->parent); \
4169 struct iscsi_transport *t = session->transport; \
4170 \
4171 if (perm && !capable(CAP_SYS_ADMIN)) \
4172 return -EACCES; \
4173 return t->get_session_param(session, param, buf); \
4174 }
4175
4176 #define iscsi_session_attr(field, param, perm) \
4177 iscsi_session_attr_show(param, perm) \
4178 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4179 NULL);
4180 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4181 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4182 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4183 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4184 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4185 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4186 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4187 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4188 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4189 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4190 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4191 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4192 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4193 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4194 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4195 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4196 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4197 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4198 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4199 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4200 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4201 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4202 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4203 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4204 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4205 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4206 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4207 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4208 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4209 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4210 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4211 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4212 iscsi_session_attr(discovery_auth_optional,
4213 ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4214 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4215 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4216 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4217 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4218 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4219 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4220 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4221
4222 static ssize_t
show_priv_session_state(struct device * dev,struct device_attribute * attr,char * buf)4223 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4224 char *buf)
4225 {
4226 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4227 return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4228 }
4229 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4230 NULL);
4231 static ssize_t
show_priv_session_creator(struct device * dev,struct device_attribute * attr,char * buf)4232 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4233 char *buf)
4234 {
4235 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4236 return sysfs_emit(buf, "%d\n", session->creator);
4237 }
4238 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4239 NULL);
4240 static ssize_t
show_priv_session_target_id(struct device * dev,struct device_attribute * attr,char * buf)4241 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4242 char *buf)
4243 {
4244 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4245 return sysfs_emit(buf, "%d\n", session->target_id);
4246 }
4247 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4248 show_priv_session_target_id, NULL);
4249
4250 #define iscsi_priv_session_attr_show(field, format) \
4251 static ssize_t \
4252 show_priv_session_##field(struct device *dev, \
4253 struct device_attribute *attr, char *buf) \
4254 { \
4255 struct iscsi_cls_session *session = \
4256 iscsi_dev_to_session(dev->parent); \
4257 if (session->field == -1) \
4258 return sysfs_emit(buf, "off\n"); \
4259 return sysfs_emit(buf, format"\n", session->field); \
4260 }
4261
4262 #define iscsi_priv_session_attr_store(field) \
4263 static ssize_t \
4264 store_priv_session_##field(struct device *dev, \
4265 struct device_attribute *attr, \
4266 const char *buf, size_t count) \
4267 { \
4268 int val; \
4269 char *cp; \
4270 struct iscsi_cls_session *session = \
4271 iscsi_dev_to_session(dev->parent); \
4272 if ((session->state == ISCSI_SESSION_FREE) || \
4273 (session->state == ISCSI_SESSION_FAILED)) \
4274 return -EBUSY; \
4275 if (strncmp(buf, "off", 3) == 0) { \
4276 session->field = -1; \
4277 session->field##_sysfs_override = true; \
4278 } else { \
4279 val = simple_strtoul(buf, &cp, 0); \
4280 if (*cp != '\0' && *cp != '\n') \
4281 return -EINVAL; \
4282 session->field = val; \
4283 session->field##_sysfs_override = true; \
4284 } \
4285 return count; \
4286 }
4287
4288 #define iscsi_priv_session_rw_attr(field, format) \
4289 iscsi_priv_session_attr_show(field, format) \
4290 iscsi_priv_session_attr_store(field) \
4291 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
4292 show_priv_session_##field, \
4293 store_priv_session_##field)
4294
4295 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4296
4297 static struct attribute *iscsi_session_attrs[] = {
4298 &dev_attr_sess_initial_r2t.attr,
4299 &dev_attr_sess_max_outstanding_r2t.attr,
4300 &dev_attr_sess_immediate_data.attr,
4301 &dev_attr_sess_first_burst_len.attr,
4302 &dev_attr_sess_max_burst_len.attr,
4303 &dev_attr_sess_data_pdu_in_order.attr,
4304 &dev_attr_sess_data_seq_in_order.attr,
4305 &dev_attr_sess_erl.attr,
4306 &dev_attr_sess_targetname.attr,
4307 &dev_attr_sess_tpgt.attr,
4308 &dev_attr_sess_password.attr,
4309 &dev_attr_sess_password_in.attr,
4310 &dev_attr_sess_username.attr,
4311 &dev_attr_sess_username_in.attr,
4312 &dev_attr_sess_fast_abort.attr,
4313 &dev_attr_sess_abort_tmo.attr,
4314 &dev_attr_sess_lu_reset_tmo.attr,
4315 &dev_attr_sess_tgt_reset_tmo.attr,
4316 &dev_attr_sess_ifacename.attr,
4317 &dev_attr_sess_initiatorname.attr,
4318 &dev_attr_sess_targetalias.attr,
4319 &dev_attr_sess_boot_root.attr,
4320 &dev_attr_sess_boot_nic.attr,
4321 &dev_attr_sess_boot_target.attr,
4322 &dev_attr_priv_sess_recovery_tmo.attr,
4323 &dev_attr_priv_sess_state.attr,
4324 &dev_attr_priv_sess_creator.attr,
4325 &dev_attr_sess_chap_out_idx.attr,
4326 &dev_attr_sess_chap_in_idx.attr,
4327 &dev_attr_priv_sess_target_id.attr,
4328 &dev_attr_sess_auto_snd_tgt_disable.attr,
4329 &dev_attr_sess_discovery_session.attr,
4330 &dev_attr_sess_portal_type.attr,
4331 &dev_attr_sess_chap_auth.attr,
4332 &dev_attr_sess_discovery_logout.attr,
4333 &dev_attr_sess_bidi_chap.attr,
4334 &dev_attr_sess_discovery_auth_optional.attr,
4335 &dev_attr_sess_def_time2wait.attr,
4336 &dev_attr_sess_def_time2retain.attr,
4337 &dev_attr_sess_isid.attr,
4338 &dev_attr_sess_tsid.attr,
4339 &dev_attr_sess_def_taskmgmt_tmo.attr,
4340 &dev_attr_sess_discovery_parent_idx.attr,
4341 &dev_attr_sess_discovery_parent_type.attr,
4342 NULL,
4343 };
4344
iscsi_session_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4345 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4346 struct attribute *attr, int i)
4347 {
4348 struct device *cdev = container_of(kobj, struct device, kobj);
4349 struct iscsi_cls_session *session = transport_class_to_session(cdev);
4350 struct iscsi_transport *t = session->transport;
4351 int param;
4352
4353 if (attr == &dev_attr_sess_initial_r2t.attr)
4354 param = ISCSI_PARAM_INITIAL_R2T_EN;
4355 else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4356 param = ISCSI_PARAM_MAX_R2T;
4357 else if (attr == &dev_attr_sess_immediate_data.attr)
4358 param = ISCSI_PARAM_IMM_DATA_EN;
4359 else if (attr == &dev_attr_sess_first_burst_len.attr)
4360 param = ISCSI_PARAM_FIRST_BURST;
4361 else if (attr == &dev_attr_sess_max_burst_len.attr)
4362 param = ISCSI_PARAM_MAX_BURST;
4363 else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4364 param = ISCSI_PARAM_PDU_INORDER_EN;
4365 else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4366 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4367 else if (attr == &dev_attr_sess_erl.attr)
4368 param = ISCSI_PARAM_ERL;
4369 else if (attr == &dev_attr_sess_targetname.attr)
4370 param = ISCSI_PARAM_TARGET_NAME;
4371 else if (attr == &dev_attr_sess_tpgt.attr)
4372 param = ISCSI_PARAM_TPGT;
4373 else if (attr == &dev_attr_sess_chap_in_idx.attr)
4374 param = ISCSI_PARAM_CHAP_IN_IDX;
4375 else if (attr == &dev_attr_sess_chap_out_idx.attr)
4376 param = ISCSI_PARAM_CHAP_OUT_IDX;
4377 else if (attr == &dev_attr_sess_password.attr)
4378 param = ISCSI_PARAM_USERNAME;
4379 else if (attr == &dev_attr_sess_password_in.attr)
4380 param = ISCSI_PARAM_USERNAME_IN;
4381 else if (attr == &dev_attr_sess_username.attr)
4382 param = ISCSI_PARAM_PASSWORD;
4383 else if (attr == &dev_attr_sess_username_in.attr)
4384 param = ISCSI_PARAM_PASSWORD_IN;
4385 else if (attr == &dev_attr_sess_fast_abort.attr)
4386 param = ISCSI_PARAM_FAST_ABORT;
4387 else if (attr == &dev_attr_sess_abort_tmo.attr)
4388 param = ISCSI_PARAM_ABORT_TMO;
4389 else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4390 param = ISCSI_PARAM_LU_RESET_TMO;
4391 else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4392 param = ISCSI_PARAM_TGT_RESET_TMO;
4393 else if (attr == &dev_attr_sess_ifacename.attr)
4394 param = ISCSI_PARAM_IFACE_NAME;
4395 else if (attr == &dev_attr_sess_initiatorname.attr)
4396 param = ISCSI_PARAM_INITIATOR_NAME;
4397 else if (attr == &dev_attr_sess_targetalias.attr)
4398 param = ISCSI_PARAM_TARGET_ALIAS;
4399 else if (attr == &dev_attr_sess_boot_root.attr)
4400 param = ISCSI_PARAM_BOOT_ROOT;
4401 else if (attr == &dev_attr_sess_boot_nic.attr)
4402 param = ISCSI_PARAM_BOOT_NIC;
4403 else if (attr == &dev_attr_sess_boot_target.attr)
4404 param = ISCSI_PARAM_BOOT_TARGET;
4405 else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4406 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4407 else if (attr == &dev_attr_sess_discovery_session.attr)
4408 param = ISCSI_PARAM_DISCOVERY_SESS;
4409 else if (attr == &dev_attr_sess_portal_type.attr)
4410 param = ISCSI_PARAM_PORTAL_TYPE;
4411 else if (attr == &dev_attr_sess_chap_auth.attr)
4412 param = ISCSI_PARAM_CHAP_AUTH_EN;
4413 else if (attr == &dev_attr_sess_discovery_logout.attr)
4414 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4415 else if (attr == &dev_attr_sess_bidi_chap.attr)
4416 param = ISCSI_PARAM_BIDI_CHAP_EN;
4417 else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4418 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4419 else if (attr == &dev_attr_sess_def_time2wait.attr)
4420 param = ISCSI_PARAM_DEF_TIME2WAIT;
4421 else if (attr == &dev_attr_sess_def_time2retain.attr)
4422 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4423 else if (attr == &dev_attr_sess_isid.attr)
4424 param = ISCSI_PARAM_ISID;
4425 else if (attr == &dev_attr_sess_tsid.attr)
4426 param = ISCSI_PARAM_TSID;
4427 else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4428 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4429 else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4430 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4431 else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4432 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4433 else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4434 return S_IRUGO | S_IWUSR;
4435 else if (attr == &dev_attr_priv_sess_state.attr)
4436 return S_IRUGO;
4437 else if (attr == &dev_attr_priv_sess_creator.attr)
4438 return S_IRUGO;
4439 else if (attr == &dev_attr_priv_sess_target_id.attr)
4440 return S_IRUGO;
4441 else {
4442 WARN_ONCE(1, "Invalid session attr");
4443 return 0;
4444 }
4445
4446 return t->attr_is_visible(ISCSI_PARAM, param);
4447 }
4448
4449 static struct attribute_group iscsi_session_group = {
4450 .attrs = iscsi_session_attrs,
4451 .is_visible = iscsi_session_attr_is_visible,
4452 };
4453
4454 /*
4455 * iSCSI host attrs
4456 */
4457 #define iscsi_host_attr_show(param) \
4458 static ssize_t \
4459 show_host_param_##param(struct device *dev, \
4460 struct device_attribute *attr, char *buf) \
4461 { \
4462 struct Scsi_Host *shost = transport_class_to_shost(dev); \
4463 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4464 return priv->iscsi_transport->get_host_param(shost, param, buf); \
4465 }
4466
4467 #define iscsi_host_attr(field, param) \
4468 iscsi_host_attr_show(param) \
4469 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
4470 NULL);
4471
4472 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4473 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4474 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4475 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4476 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4477 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4478
4479 static struct attribute *iscsi_host_attrs[] = {
4480 &dev_attr_host_netdev.attr,
4481 &dev_attr_host_hwaddress.attr,
4482 &dev_attr_host_ipaddress.attr,
4483 &dev_attr_host_initiatorname.attr,
4484 &dev_attr_host_port_state.attr,
4485 &dev_attr_host_port_speed.attr,
4486 NULL,
4487 };
4488
iscsi_host_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)4489 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4490 struct attribute *attr, int i)
4491 {
4492 struct device *cdev = container_of(kobj, struct device, kobj);
4493 struct Scsi_Host *shost = transport_class_to_shost(cdev);
4494 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4495 int param;
4496
4497 if (attr == &dev_attr_host_netdev.attr)
4498 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4499 else if (attr == &dev_attr_host_hwaddress.attr)
4500 param = ISCSI_HOST_PARAM_HWADDRESS;
4501 else if (attr == &dev_attr_host_ipaddress.attr)
4502 param = ISCSI_HOST_PARAM_IPADDRESS;
4503 else if (attr == &dev_attr_host_initiatorname.attr)
4504 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4505 else if (attr == &dev_attr_host_port_state.attr)
4506 param = ISCSI_HOST_PARAM_PORT_STATE;
4507 else if (attr == &dev_attr_host_port_speed.attr)
4508 param = ISCSI_HOST_PARAM_PORT_SPEED;
4509 else {
4510 WARN_ONCE(1, "Invalid host attr");
4511 return 0;
4512 }
4513
4514 return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4515 }
4516
4517 static struct attribute_group iscsi_host_group = {
4518 .attrs = iscsi_host_attrs,
4519 .is_visible = iscsi_host_attr_is_visible,
4520 };
4521
4522 /* convert iscsi_port_speed values to ascii string name */
4523 static const struct {
4524 enum iscsi_port_speed value;
4525 char *name;
4526 } iscsi_port_speed_names[] = {
4527 {ISCSI_PORT_SPEED_UNKNOWN, "Unknown" },
4528 {ISCSI_PORT_SPEED_10MBPS, "10 Mbps" },
4529 {ISCSI_PORT_SPEED_100MBPS, "100 Mbps" },
4530 {ISCSI_PORT_SPEED_1GBPS, "1 Gbps" },
4531 {ISCSI_PORT_SPEED_10GBPS, "10 Gbps" },
4532 {ISCSI_PORT_SPEED_25GBPS, "25 Gbps" },
4533 {ISCSI_PORT_SPEED_40GBPS, "40 Gbps" },
4534 };
4535
iscsi_get_port_speed_name(struct Scsi_Host * shost)4536 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4537 {
4538 int i;
4539 char *speed = "Unknown!";
4540 struct iscsi_cls_host *ihost = shost->shost_data;
4541 uint32_t port_speed = ihost->port_speed;
4542
4543 for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4544 if (iscsi_port_speed_names[i].value & port_speed) {
4545 speed = iscsi_port_speed_names[i].name;
4546 break;
4547 }
4548 }
4549 return speed;
4550 }
4551 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4552
4553 /* convert iscsi_port_state values to ascii string name */
4554 static const struct {
4555 enum iscsi_port_state value;
4556 char *name;
4557 } iscsi_port_state_names[] = {
4558 {ISCSI_PORT_STATE_DOWN, "LINK DOWN" },
4559 {ISCSI_PORT_STATE_UP, "LINK UP" },
4560 };
4561
iscsi_get_port_state_name(struct Scsi_Host * shost)4562 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4563 {
4564 int i;
4565 char *state = "Unknown!";
4566 struct iscsi_cls_host *ihost = shost->shost_data;
4567 uint32_t port_state = ihost->port_state;
4568
4569 for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4570 if (iscsi_port_state_names[i].value & port_state) {
4571 state = iscsi_port_state_names[i].name;
4572 break;
4573 }
4574 }
4575 return state;
4576 }
4577 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4578
iscsi_session_match(struct attribute_container * cont,struct device * dev)4579 static int iscsi_session_match(struct attribute_container *cont,
4580 struct device *dev)
4581 {
4582 struct iscsi_cls_session *session;
4583 struct Scsi_Host *shost;
4584 struct iscsi_internal *priv;
4585
4586 if (!iscsi_is_session_dev(dev))
4587 return 0;
4588
4589 session = iscsi_dev_to_session(dev);
4590 shost = iscsi_session_to_shost(session);
4591 if (!shost->transportt)
4592 return 0;
4593
4594 priv = to_iscsi_internal(shost->transportt);
4595 if (priv->session_cont.ac.class != &iscsi_session_class.class)
4596 return 0;
4597
4598 return &priv->session_cont.ac == cont;
4599 }
4600
iscsi_conn_match(struct attribute_container * cont,struct device * dev)4601 static int iscsi_conn_match(struct attribute_container *cont,
4602 struct device *dev)
4603 {
4604 struct iscsi_cls_session *session;
4605 struct iscsi_cls_conn *conn;
4606 struct Scsi_Host *shost;
4607 struct iscsi_internal *priv;
4608
4609 if (!iscsi_is_conn_dev(dev))
4610 return 0;
4611
4612 conn = iscsi_dev_to_conn(dev);
4613 session = iscsi_dev_to_session(conn->dev.parent);
4614 shost = iscsi_session_to_shost(session);
4615
4616 if (!shost->transportt)
4617 return 0;
4618
4619 priv = to_iscsi_internal(shost->transportt);
4620 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4621 return 0;
4622
4623 return &priv->conn_cont.ac == cont;
4624 }
4625
iscsi_host_match(struct attribute_container * cont,struct device * dev)4626 static int iscsi_host_match(struct attribute_container *cont,
4627 struct device *dev)
4628 {
4629 struct Scsi_Host *shost;
4630 struct iscsi_internal *priv;
4631
4632 if (!scsi_is_host_device(dev))
4633 return 0;
4634
4635 shost = dev_to_shost(dev);
4636 if (!shost->transportt ||
4637 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4638 return 0;
4639
4640 priv = to_iscsi_internal(shost->transportt);
4641 return &priv->t.host_attrs.ac == cont;
4642 }
4643
4644 struct scsi_transport_template *
iscsi_register_transport(struct iscsi_transport * tt)4645 iscsi_register_transport(struct iscsi_transport *tt)
4646 {
4647 struct iscsi_internal *priv;
4648 unsigned long flags;
4649 int err;
4650
4651 BUG_ON(!tt);
4652
4653 priv = iscsi_if_transport_lookup(tt);
4654 if (priv)
4655 return NULL;
4656
4657 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4658 if (!priv)
4659 return NULL;
4660 INIT_LIST_HEAD(&priv->list);
4661 priv->iscsi_transport = tt;
4662 priv->t.user_scan = iscsi_user_scan;
4663 priv->t.create_work_queue = 1;
4664
4665 priv->dev.class = &iscsi_transport_class;
4666 dev_set_name(&priv->dev, "%s", tt->name);
4667 err = device_register(&priv->dev);
4668 if (err)
4669 goto free_priv;
4670
4671 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4672 if (err)
4673 goto unregister_dev;
4674
4675 /* host parameters */
4676 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4677 priv->t.host_attrs.ac.match = iscsi_host_match;
4678 priv->t.host_attrs.ac.grp = &iscsi_host_group;
4679 priv->t.host_size = sizeof(struct iscsi_cls_host);
4680 transport_container_register(&priv->t.host_attrs);
4681
4682 /* connection parameters */
4683 priv->conn_cont.ac.class = &iscsi_connection_class.class;
4684 priv->conn_cont.ac.match = iscsi_conn_match;
4685 priv->conn_cont.ac.grp = &iscsi_conn_group;
4686 transport_container_register(&priv->conn_cont);
4687
4688 /* session parameters */
4689 priv->session_cont.ac.class = &iscsi_session_class.class;
4690 priv->session_cont.ac.match = iscsi_session_match;
4691 priv->session_cont.ac.grp = &iscsi_session_group;
4692 transport_container_register(&priv->session_cont);
4693
4694 spin_lock_irqsave(&iscsi_transport_lock, flags);
4695 list_add(&priv->list, &iscsi_transports);
4696 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4697
4698 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4699 return &priv->t;
4700
4701 unregister_dev:
4702 device_unregister(&priv->dev);
4703 return NULL;
4704 free_priv:
4705 kfree(priv);
4706 return NULL;
4707 }
4708 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4709
iscsi_unregister_transport(struct iscsi_transport * tt)4710 int iscsi_unregister_transport(struct iscsi_transport *tt)
4711 {
4712 struct iscsi_internal *priv;
4713 unsigned long flags;
4714
4715 BUG_ON(!tt);
4716
4717 mutex_lock(&rx_queue_mutex);
4718
4719 priv = iscsi_if_transport_lookup(tt);
4720 BUG_ON (!priv);
4721
4722 spin_lock_irqsave(&iscsi_transport_lock, flags);
4723 list_del(&priv->list);
4724 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4725
4726 transport_container_unregister(&priv->conn_cont);
4727 transport_container_unregister(&priv->session_cont);
4728 transport_container_unregister(&priv->t.host_attrs);
4729
4730 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4731 device_unregister(&priv->dev);
4732 mutex_unlock(&rx_queue_mutex);
4733
4734 return 0;
4735 }
4736 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4737
iscsi_dbg_trace(void (* trace)(struct device * dev,struct va_format *),struct device * dev,const char * fmt,...)4738 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4739 struct device *dev, const char *fmt, ...)
4740 {
4741 struct va_format vaf;
4742 va_list args;
4743
4744 va_start(args, fmt);
4745 vaf.fmt = fmt;
4746 vaf.va = &args;
4747 trace(dev, &vaf);
4748 va_end(args);
4749 }
4750 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4751
iscsi_transport_init(void)4752 static __init int iscsi_transport_init(void)
4753 {
4754 int err;
4755 struct netlink_kernel_cfg cfg = {
4756 .groups = 1,
4757 .input = iscsi_if_rx,
4758 };
4759 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4760 ISCSI_TRANSPORT_VERSION);
4761
4762 atomic_set(&iscsi_session_nr, 0);
4763
4764 err = class_register(&iscsi_transport_class);
4765 if (err)
4766 return err;
4767
4768 err = class_register(&iscsi_endpoint_class);
4769 if (err)
4770 goto unregister_transport_class;
4771
4772 err = class_register(&iscsi_iface_class);
4773 if (err)
4774 goto unregister_endpoint_class;
4775
4776 err = transport_class_register(&iscsi_host_class);
4777 if (err)
4778 goto unregister_iface_class;
4779
4780 err = transport_class_register(&iscsi_connection_class);
4781 if (err)
4782 goto unregister_host_class;
4783
4784 err = transport_class_register(&iscsi_session_class);
4785 if (err)
4786 goto unregister_conn_class;
4787
4788 err = bus_register(&iscsi_flashnode_bus);
4789 if (err)
4790 goto unregister_session_class;
4791
4792 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4793 if (!nls) {
4794 err = -ENOBUFS;
4795 goto unregister_flashnode_bus;
4796 }
4797
4798 iscsi_eh_timer_workq = alloc_workqueue("%s",
4799 WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
4800 1, "iscsi_eh");
4801 if (!iscsi_eh_timer_workq) {
4802 err = -ENOMEM;
4803 goto release_nls;
4804 }
4805
4806 iscsi_destroy_workq = alloc_workqueue("%s",
4807 WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
4808 1, "iscsi_destroy");
4809 if (!iscsi_destroy_workq) {
4810 err = -ENOMEM;
4811 goto destroy_wq;
4812 }
4813
4814 return 0;
4815
4816 destroy_wq:
4817 destroy_workqueue(iscsi_eh_timer_workq);
4818 release_nls:
4819 netlink_kernel_release(nls);
4820 unregister_flashnode_bus:
4821 bus_unregister(&iscsi_flashnode_bus);
4822 unregister_session_class:
4823 transport_class_unregister(&iscsi_session_class);
4824 unregister_conn_class:
4825 transport_class_unregister(&iscsi_connection_class);
4826 unregister_host_class:
4827 transport_class_unregister(&iscsi_host_class);
4828 unregister_iface_class:
4829 class_unregister(&iscsi_iface_class);
4830 unregister_endpoint_class:
4831 class_unregister(&iscsi_endpoint_class);
4832 unregister_transport_class:
4833 class_unregister(&iscsi_transport_class);
4834 return err;
4835 }
4836
iscsi_transport_exit(void)4837 static void __exit iscsi_transport_exit(void)
4838 {
4839 destroy_workqueue(iscsi_destroy_workq);
4840 destroy_workqueue(iscsi_eh_timer_workq);
4841 netlink_kernel_release(nls);
4842 bus_unregister(&iscsi_flashnode_bus);
4843 transport_class_unregister(&iscsi_connection_class);
4844 transport_class_unregister(&iscsi_session_class);
4845 transport_class_unregister(&iscsi_host_class);
4846 class_unregister(&iscsi_endpoint_class);
4847 class_unregister(&iscsi_iface_class);
4848 class_unregister(&iscsi_transport_class);
4849 }
4850
4851 module_init(iscsi_transport_init);
4852 module_exit(iscsi_transport_exit);
4853
4854 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4855 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4856 "Alex Aizman <itn780@yahoo.com>");
4857 MODULE_DESCRIPTION("iSCSI Transport Interface");
4858 MODULE_LICENSE("GPL");
4859 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4860 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
4861