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